Author: claimsbot

1. A method for communicating data between a remote data processing system and a local data processing system within a network, said method comprising:
designating an application-specific buffer within a local data processing system for buffering data to be communicated to an application executing on said local data processing system by sending a designation message from said application to a TCPIP stack;
registering with a network interface of said local data processing system a registered port for packets communicated with said application;
in response to the receipt of a packet at said network interface, determining if said packet specifies said registered port associated with said application executing on said local data processing system;
in response to a determination that said packet does not specify said registered port associated with said application executing on said local data processing system, delivering data by said network interface from said packet to a common buffer; and
in response to a determination that said packet specifies said registered port associated with said application executing on said local data processing system, delivering data by said network interface from said packet to said application-specific buffer of said application according to said port registration.
2. The method of claim 1, wherein said method further includes delivering header information by said network interface from said packet to a common buffer in said local data processing system.
3. The method of claim 2, wherein:
said designating an application-specific buffer within said local data processing system further includes designating a common buffer; and
said delivering data from said packet to said application-specific buffer further includes delivering data from said packet to said application-specific buffer while bypassing said common buffer.
4. The method of claim 1, wherein said designating an application-specific buffer further includes pre-registering said address of said application-specific buffer with a TCPIP stack by said application.
5. The method of claim 1, wherein said method further includes:
registering said address of said application-specific buffer with a communication driver by said TCPIP stack; and
recording said address of said application-specific buffer by said communication driver.
6. The method of claim 1, wherein said registering further includes registering with an Ethernet adapter a port for packets communicated with said application.
7. The method of claim 1, wherein said determining further includes determining a Transmission Control Protocol Packet if said Transmission Control Protocol Packet specifies a registered port.
8. An apparatus for communicating data between a remote data processing system and a local data processing system within a network, said apparatus comprising:
means for designating an application-specific buffer within a local data processing system for buffering data to be communicated to an application executing on said local data processing system by sending a designation message from said application to a TCPIP stack;
means for registering with a network interface of said local data processing system a registered port for packets communicated with said application;
means for, in response to the receipt of a packet at said network interface, determining if said packet specifies said registered port associated with said application executing on said local data processing system;
means for, in response to a determination that said packet does not specify a registered port associated with said application executing on said local data processing system, delivering data by said network interface from said packet to a common buffer; and
means for, responsive to a determination that said packet specifies said registered port associated with said application executing on said local data processing system, delivering data by said network interface from said packet to said application-specific buffer of said application according to said port registration.
9. The apparatus of claim 8, wherein said apparatus further includes means for delivering header information by said network interface from said packet to a common buffer in said local data processing system.
10. The apparatus of claim 8, wherein:
said means for designating an application-specific buffer within said local data processing system further includes means for designating a common buffer; and
said means for delivering data from said packet to said application-specific buffer further includes means for delivering data from said packet to said application-specific buffer while bypassing said common buffer.
11. The apparatus of claim 8, wherein said means for designating an application-specific buffer further includes means for pre-registering said address of said application-specific buffer with a TCPIP stack by said application.
12. The apparatus of claim 8, wherein said apparatus further includes:
means for registering said address of said application-specific buffer with a communication driver by said TCPIP stack; and
means for recording said address of said application-specific buffer by said communication driver.
13. The apparatus of claim 8, wherein said means for registering further includes means for registering with an Ethernet adapter a port for packets communicated with said application.
14. The apparatus of claim 8, wherein said means for determining further includes means for determining a Transmission Control Protocol Packet if said Transmission Control Protocol Packet specifies a registered port.
15. A computer-readable medium having a computer program product for communicating data between a remote data processing system and a local data processing system within a network, said computer-readable medium comprising:
instructions for designating an application-specific buffer within a local data processing system for buffering data to be communicated to an application executing on said local data processing system by sending a designation message from said application to a TCPIP stack;
instructions for registering with a network interface of said local data processing system a registered port for packets communicated with said application;
instructions for, in response to the receipt of a packet at said network interface, determining if said packet specifies said registered port associated with said application executing on said local data processing system;
instructions for, in response to a determination that said packet does not specify a registered port associated with said application executing on said local data processing system, delivering data by said network interface from said packet to a common buffer; and
instructions, in response to a determination that said packet specifies said registered port associated with said application executing on said local data processing system, delivering data by said network interface from said packet to said application-specific buffer of said application according to said port registration.
16. The computer-readable medium of claim 15, wherein said computer-readable medium further includes instructions for delivering header information by said network interface from said packet to a common buffer in said local data processing system.
17. The computer-readable medium of claim 16, wherein:
said instructions for designating an application-specific buffer within said local data processing system further include instructions for designating a common buffer; and
said instructions for delivering data from said packet to said application-specific buffer further include instructions for delivering data from said packet to said application-specific buffer while bypassing said common buffer.
18. The computer-readable medium of claim 15, wherein said instructions for designating an application-specific buffer further include instructions for pre-registering said address of said application-specific buffer with a TCPIP stack by said application.
19. The computer-readable medium of claim 15, wherein said instructions for registering further include instructions for registering with an Ethernet adapter a port for packets communicated with said application.
20. The computer-readable medium of claim 15, wherein said instructions for determining a Transmission Control Protocol Packet further includes instructions for determining if said Transmission Control Protocol Packet specifies a registered port.
21. The computer-readable medium of claim 15, wherein said computer-readable medium further includes:
instructions for registering said address of said application-specific buffer with a communication driver by said TCPIP stack; and
instructions for, recording said address of said application-specific buffer by said communication driver.

The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.

1. A signal processing apparatus, comprising:
extraction means for extracting a feature quantity indicative of characteristics of sounds represented by a sound signal, the sounds including different tones from within a 12-tone equal temperament and being arranged in an order of a musical scale based on a first reference sound having a predetermined tone;
root decision means for receiving the feature quantity and deciding whether the first reference sound is a root of a first chord of the arranged sounds, the decision being based on the feature quantity;
output means for outputting whether the reference sound is the root; and
detection means for detecting the starting and ending positions of beats within the sound signal,
wherein the extraction means extracts the feature guantity from within a range of one of the beats, and
wherein the root decision means decides whether the first reference sound is a root that falls within the range of the one beat.
2. The signal processing apparatus according to claim 1, wherein the feature quantity is indicative of energy levels of the sounds of the different tones.
3. The signal processing apparatus according to claim 2, wherein the sounds are integrated over a plurality of octaves and the feature quantity is indicative of the energy levels over the plurality of octaves for the different tones.
4. The signal processing apparatus according to claim 1, further comprising chord type decision means for deciding whether the first chord is a major chord or a minor chord based on the feature quantity.
5. The signal processing apparatus according to claim 4, further comprising:
shifting means for shifting the feature quantity to change the first reference sound to a second reference sound,
wherein the root decision means decides whether the second reference sound is a root of a second chord of the arranged sounds, the decision being based on the shifted feature quantity, and
wherein the chord type decision means decides whether the second chord is a major chord or a minor chord based on the shifted feature quantity.
6. The signal processing apparatus according to claim 4:
wherein the root decision means outputs a first discrimination function;
wherein the chord type decision means outputs a second discrimination function; and
wherein the signal processing apparatus comprises a probability calculation means for calculating a probability that the first or second reference sound is a respective root of the first or second chord based on the first discrimination function and calculating a probability that the first or second chord is a major chord or a minor chord based on the second discrimination function.
7. A signal processing method performed by a signal processing apparatus, comprising the steps of:
extracting, by using a beat feature guantity extraction section in the signal processing apparatus, a feature quantity indicative of characteristics of sounds represented by a sound signal, the sounds including different tones from within a 12-tone equal temperament and being arranged in an order of a musical scale based on a reference sound having a predetermined tone;
deciding whether the reference sound is a root of a chord of the arranged sounds based on the feature quantity;
outputting whether the reference sound is the root;
detecting the starting and ending positions of beats within the sound signal, wherein the feature guantity is extracted from within a range of one of the beats; and
deciding whether the reference sound is a root that falls within the range of the one beat.
8. A computer-readable storage medium, storing a program, which when executed on a processor, causes the processor to execute a signal processing method, the method comprising:
extracting a feature quantity indicative of characteristics of sounds represented by a sound signal, the sounds including different tones from within a 12-tone equal temperament and being arranged in an order of a musical scale based on a reference sound having a predetermined tone;
deciding whether the reference sound is a root of a chord of the arranged sounds based on the feature quantity;
outputting whether the reference sound is the root; detecting the starting and ending positions of beats within the sound signal, wherein the feature guantity is extracted from within a range of one of the beats; and
deciding whether the reference sound is a root that falls within the range of the one beat.
9. A signal processing apparatus, comprising:
means for extracting a feature quantity indicative of characteristics of sounds represented by a sound signal, the sounds including different tones from within a 12-tone equal temperament and being arranged in an order of a musical scale based on a reference sound having a predetermined tone;
means for determining whether the reference sound is a root based on the feature quantity and a chord of the sound signal;
means for outputting whether the reference sound is the root of the chord; and
means for detecting the starting and ending positions of beats within the sound signal,
wherein the means for extracting extracts the feature guantity from within a range of one of the beats, and
wherein the means for determining determines whether the reference sound is a root that falls within the range of the one beat.
10. A signal processing method performed by a signal processing apparatus, comprising the steps of:
extracting, by using a beat feature guantity extraction section in the signal processing apparatus, a feature quantity indicative of characteristics of sounds represented by a sound signal, the sounds including different tones from within a 12 -tone equal temperament and being arranged in an order of a musical scale based on a reference sound having a predetermined tone;
determining whether the reference sound is a root based on the feature quantity and a chord of the sound signal;
outputting whether the reference sound is the root of the chord;
detecting the starting and ending positions of beats within the sound signal, wherein the feature guantity is extracted from within a range of one of the beats; and
deciding whether the reference sound is a root that falls within the range of the one beat.
11. A computer-readable storage medium storing a program, which when executed on a processor, causes the processor to execute a signal processing method, the method comprising:
extracting a feature quantity indicative of characteristics of sounds represented by a sound signal, the sounds including different tones from within a 12-tone equal temperament and being arranged in an order of a musical scale based on a reference sound having a predetermined tone;
determining whether the reference sound is a root based on the feature quantity and a chord of the sound signal;
outputting whether the reference sound is the root of the chord;
detecting the starting and ending positions of beats within the sound signal, wherein the feature guantity is extracted from within a range of one of the beats; and
deciding whether the reference sound is a root that falls within the range of the one beat.
12. A signal processing apparatus, comprising:
an extraction section configured to extract a feature quantity indicative of characteristics of sounds represented by a sound signal, the sounds including different tones from within a 12-tone equal temperament and being arranged in an order of a musical scale based on a reference sound having a predetermined tone;
a root decision section configured to receive the feature quantity and decide whether the reference sound is a root of a chord of the arranged sound, the decision being based on the feature quantity;
an outputting section configured to output whether the reference sound is the root of the; and
a detection section for detecting the starting and ending positions of beats within the sound signal,
wherein the extraction section extracts the feature guantity from within a range of one of the beats, and
wherein the root decision section decides whether the first reference sound is a root that falls within the range of the one beat.
13. A signal processing apparatus, comprising:
an extraction section configured to extract feature quantity indicative of characteristics of sounds represented by a sound signal, the sounds including different tones from within a 12-tone equal temperament and being arranged in an order of a musical scale based on a reference sound having a predetermined tone;
a determining section configured to determine whether the reference sound is a root based on the feature quantity and a chord of the sound signal;
an outputting section configured to output whether the reference sound is the root of the chord; and
a detection section for detecting the starting and ending positions of beats within the sound signal,
wherein the extraction section extracts the feature guantity from within a range of one of the beats, and
wherein the root decision section decides whether the first reference sound is a root that falls within the range of the one beat.

1. A method for providing electronic content, comprising:
presenting a list of a plurality of selectable electronic-content-items available for downloading to a first mobile electronic device;
receiving a request for one or more selected electronic-content-items of the plurality of selectable electronic-content-items;
in response to receiving the request, a second mobile electronic device retrieving the one or more selected electronic-content-items; and
the second mobile electronic device transmitting the one or more selected electronic-content-items to the first mobile electronic device via a short-range wireless connection between the first and second mobile electronic devices.
2. The method of claim 1, wherein presenting the list comprises the second mobile electronic device transmitting the list of the plurality of selectable electronic-content-items via the short-range wireless connection to the first mobile electronic device.
3. The method of claim 2, wherein transmitting the list is performed by a short-range communications subsystem of the second mobile electronic device
4. The method of claim 1, wherein presenting the list comprises the second mobile electronic device displaying the list of selectable electronic-content-items on a display element of the second mobile electronic device.
5. The method of claim 4, wherein receiving the request further comprises receiving at an inputoutput subsystem of the second mobile electronic device a selection for the one or more selected electronic-content-items of the plurality of selectable electronic-content-items.
6. The method of claim 1, wherein presenting the list is in response to receiving a request for the list of the plurality of selectable electronic-content-items.
7. The method of claim 6, wherein presenting the list further comprises receiving the request from the first mobile electronic device at a short-range communications subsystem of the second mobile electronic device via the short-range wireless connection.
8. The method of claim 6, wherein presenting the list further comprises receiving the request at an inputoutput subsystem of the second mobile electronic device.
9. The method of claim 8, wherein the inputoutput subsystem of the second mobile electronic device comprises a user interface of the second mobile electronic device.
10. The method of claim 1, wherein the request for one or more selected electronic-content-items is received at a short-range communications subsystem of the second mobile electronic device.
11. The method of claim 1, wherein receiving the request for one or more selected electronic-content-items further comprises:
receiving at an inputoutput subsystem of the second mobile electronic device selection of the one or more selected electronic-content-items.
12. The method of claim 11, wherein the inputoutput subsystem of the second mobile electronic device comprises a user interface of the second mobile electronic device.
13. The method of claim 1, further comprising retrieving the plurality of selectable electronic-content-items and storing the retrieved plurality of selectable electronic-content-items in an electronic content repository of the second mobile electronic device.
14. The method of claim 1, wherein the plurality of selectable electronic-content-items is available in an electronic content repository of the second mobile electronic device and retrieving comprises an electronic content manager of the mobile electronic device retrieving the one or more selected electronic-content-items from the electronic content repository.
15. The method of claim 1, wherein the plurality of selectable electronic-content-items is available from a content server external the second mobile electronic device, the method further comprising:
the second mobile electronic device establishing a long-range wireless connection with the content server;
a long-range communication subsystem of the second mobile electronic device querying the content server;
the long range communication subsystem receiving via the long-range wireless connection the plurality of selectable electronic-content-items from the content server;
in response to the request for one or more selected electronic-content-items of the plurality of selectable electronic-content-items received by the second mobile electronic device, the second mobile electronic device retrieving the one or more selected electronic-content-items by requesting and receiving from the content server via the long-range wireless connection the one or more selected electronic-content-items; and
a short-range communications subsystem of the second mobile electronic device transmitting the retrieved one or more selected electronic-content-items via the short-range wireless connection to the first mobile electronic device.
16. The method of claim 15, wherein the plurality of selectable electronic-content-items reside in a content repository coupled to the content server and further comprising the content server retrieving the plurality of selectable electronic-content-items from the content repository.
17. The method of claim 15, further comprising:
after receiving the request, the second mobile electronic device re-establishing the long-range wireless connection to the content server;
18. The method of claim 1, wherein the plurality of selectable electronic-content-items is available from a content server.
19. The method of claim 18, wherein in response to the second mobile electronic device receiving the request for one or more selected electronic-content-items of the plurality of selectable electronic-content-items, the method further comprising:
a long-range communication subsystem of the second mobile electronic device retrieving the one or more selected electronic-content-items from the content server via a long-range wireless connection with the content server; and
a short-range communications subsystem of the second mobile electronic device transmitting the retrieved one or more selected electronic-content-items via the short-range wireless connection.
20. The method of claim 19, further comprising:
after receiving the request, the second mobile electronic device establishing the long-range wireless connection to the content server;
21. The method of claim 19, further comprising an electronic content manager of the second mobile electronic device storing the retrieved one or more selected electronic-content-items in an electronic content repository of the second mobile electronic device.
22. The method of claim 18, the method further comprising:
a long-range communication subsystem of the second mobile electronic device retrieving the plurality of selectable electronic-content-items from the content server via a long-range wireless connection with the content server; and
in response to the mobile electronic device receiving the request, a short-range communications subsystem of the second mobile electronic device transmitting the retrieved one or more selected electronic-content-items via the short-range wireless connection to the first mobile electronic device.
23. The method of claim 18, further comprising:
after receiving the request, the second mobile electronic device establishing the long-range wireless connection to the content server;
24. The method of claim 18, further comprising:
an electronic content manager of the second mobile electronic device storing the retrieved plurality of selectable electronic-content-items in an electronic content repository of the second mobile electronic device.
25. The method of claim 1, wherein transmitting the one or more selected electronic-content-items further comprises a short-range communications subsystem of the second mobile electronic device transmitting the one or more selected electronic-content-items via the short-range wireless connection to the first mobile electronic device.
26. The method of claim 1, further comprising establishing the short-range wireless connection between the first and second mobile electronic devices.
27. The method of claim 26, wherein establishing the short-range wireless connection between the first and second mobile electronic devices creates a personal area network (PAN) between the first and second mobile electronic devices.
28. The method of claim 1, wherein the plurality of selectable electronic-content-items comprise one or more of an electronic book, video, music, multimedia, and an e-mail attachment.
29. The method of claim 1, further comprising:
the second mobile electronic device transmitting an electronic contact list via the short-range wireless connection, wherein the electronic contact list is an updated list of electronic content stored on the second mobile electronic device.
30. The method of claim 1, the first mobile electronic device having a display of sufficient size to enable visual viewing of electronic content.

The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.

What is claimed is:

1. A switching power supply unit comprising:
a transformer having a primary winding and a secondary winding;
a capacitor coupled to the transformer;
a first switching circuit connected in series with a series circuit of the primary winding and an input power source, the first switching circuit comprising a parallel circuit comprising a first switching element, a first diode and a first capacitor;
a second switching circuit connected in parallel with the primary winding, the second switching circuit comprising a parallel circuit comprising a second switching element, a second diode and a second capacitor;
first and second switching controlling circuits connected to the first and second switching circuits, respectively for controlling the first and second switching elements so as to turn onoff alternately with a period in which the first and second switching elements turn off being interposed therebetween;
a rectifying and smoothing circuit connected to the secondary winding; and
a voltage detection and voltage reduction circuit having a control signal input terminal and connected to the rectifying and smoothing circuit, the voltage detection and voltage reduction circuit detecting an output voltage of the rectifying and smoothing circuit and outputting a feedback signal to the first switching controlling circuit such that an output voltage of the rectifying and smoothing circuit is stabilized at one of a first voltage and a second voltage lower than the first voltage based on a signal applied to the control signal input terminal.
2. The switching power supply unit of claim 1, wherein at least one of the first and second switching elements comprises a field-effect transistor.
3. The switching power supply unit of claim 1, wherein the transformer includes a first driving winding for generating a voltage driving the first switching element into conduction and a second driving winding for generating a voltage driving the second switching element to perform a self-excited oscillation.
4. The switching power supply unit of claim 2, wherein the transformer includes a first driving winding for generating a voltage driving the first switching element into conduction and a second driving winding for generating a voltage driving the second switching element to perform a self-excited oscillation.
5. The switching power supply unit of claim 1, wherein the transformer includes one of a leakage inductor disposed between the primary winding and the secondary winding and an inductor connected in series with the primary winding; and
the inductor and the capacitor form a resonance circuit.
6. The switching power supply unit of claim 1, wherein the rectifying and smoothing circuit includes a diode, and at least one of a parasitic capacitance of the diode and a capacitive impedance connected in parallel to the diode; and
the at least one of the parasitic capacitance and the capacitive impedance and an inductance of the transformer form a resonance circuit during a period in which the first and second switching elements are both turned off.
7. The switching power supply unit of claim 2, wherein the rectifying and smoothing circuit includes a diode, and at least one of a parasitic capacitance of the diode and a capacitive impedance connected in parallel to the diode; and
the at least one of the parasitic capacitance and the capacitive impedance and an inductance of the transformer form a resonance circuit during a period in which the first and second switching elements are both turned off.
8. The switching power supply unit of claim 1, wherein the second switching controlling circuit includes a time constant control circuit comprised of a transistor, a capacitor, and an impedance circuit.
9. The switching power supply unit of claim 1, wherein an on-period of the first switching element is controlled so as to control the output voltage so that an on-period of the second switching element is maintained approximately constant.
10. The switching power supply unit of claim 2, wherein an on-period of the first switching element is controlled so as to control the output voltage so that an on-period of the second switching element is maintained approximately constant.
11. The switching power supply unit of claim 3, wherein an on-period of the first switching element is controlled so as to control the output voltage so that an on-period of the second switching element is maintained approximately constant.
12. The switching power supply unit of claim 5, wherein an on-period of the first switching element is controlled so as to control the output voltage so that an on-period of the second switching element is maintained approximately constant.
13. The switching power supply unit of claim 6, wherein an on-period of the first switching element is controlled so as to control the output voltage so that an on-period of the second switching element is maintained approximately constant.
14. The switching power supply unit of claim 8, wherein an on-period of the first switching element is controlled so as to control the output voltage so that an on-period of the second switching element is maintained approximately constant.
15. The switching power supply unit of claim 1, further comprising a control circuit for controlling the time of conduction of the second switching element such that at least one of the first and second switching elements is brought into a conductive state at a voltage of zero or after dropping down to a voltage of zero.
16. The switching power supply unit of claim 2, further comprising a control circuit for controlling the time of conduction of the second switching element such that at least one of the first and second switching elements is brought into a conductive state at a voltage of zero or after dropping down to a voltage of zero.
17. The switching power supply unit of claim 3, further comprising a control circuit for controlling the time of conduction of the second switching element such that at least one of the first and second switching elements is brought into a conductive state at a voltage of zero or after dropping down to a voltage of zero.
18. The switching power supply unit of claim 5, further comprising a control circuit for controlling the time of conduction of the second switching element such that at least one of the first and second switching elements is brought into a conductive state at a voltage of zero or after dropping down to a voltage of zero.
19. The switching power supply unit of claim 6, further comprising a control circuit for controlling the time of conduction of the second switching element such that at least one of the first and second switching elements is brought into a conductive state at a voltage of zero or after dropping down to a voltage of zero.
20. The switching power supply unit of claim 8, wherein the second switching controlling circuit controls the time of conduction of the second switching element such that at least one of the first and second switching elements is brought into a conductive state at a voltage of zero or after dropping down to a voltage of zero.
21. The switching power supply unit of claim 9, further comprising a control circuit for controlling the time of conduction of the second switching element such that at least one of the first and second switching elements is brought into a conductive state at a voltage of zero or after dropping down to a voltage of zero.
22. The switching power supply unit of claim 1, wherein the output voltage is decreased by the voltage detection and voltage reduction circuit to reduce current fed back to an input power supply; and
operations of the first and second switching elements are intermittent oscillation operations in which an oscillation period for performing onoff switching operations and a suspension period for performing no switching operations are alternately repeated.
23. The switching power supply unit of claim 2, wherein the output voltage is decreased by the voltage detection and voltage reduction circuit to reduce current fed back to on input power supply; and
operations of the first and second switching elements are intermittent oscillation operations in which an oscillation period for performing onoff switching operations and a suspension period for performing no switching operations are alternately repeated.
24. The switching power supply unit of claim 3, wherein the output voltage is decreased by the voltage detection and voltage reduction circuit to reduce current fed back to an input power supply; and
operations of the first and second switching elements are intermittent oscillation operations in which an oscillation period for performing onoff switching operations and a suspension period for performing no switching operations are alternately repeated.
25. The switching power supply unit of claim 5, wherein the output voltage is decreased by the voltage detection and voltage reduction circuit to reduce current fed back to an input supply; and
operations of the first and second switching elements are intermittent oscillation operations in which an oscillation period for performing onoff switching operations and a suspension period for performing no switching operations are alternately repeated.
26. The switching power supply unit of claim 6, wherein the output voltage is decreased by the voltage detection and voltage reduction circuit to reduce current fed back to an input power supply; and
operations of the first and second switching elements are intermittent oscillation operations in which an oscillation period for performing onoff switching operations and a suspension period for performing no switching operations are alternately repeated.
27. The switching power supply unit of claim 8, wherein the output voltage is decreased by the voltage detection and voltage reduction circuit to reduce current fed back to an input power supply; and
operations of the first and second switching elements are intermittent oscillation operations in which an oscillation period for performing onoff switching operations and a suspension period for performing no switching operations are alternately repeated.
28. The switching power supply unit of claim 9, wherein the output voltage is decreased by the voltage detection and voltage reduction circuit to reduce current fed back to an input power supply; and
operations of the first and second switching elements are intermittent oscillation operations in which an oscillation period for performing onoff switching operations and a suspension period for performing no switching operations are alternately repeated.
29. The switching power supply unit of claims 15, wherein the output voltage is decreased by the voltage detection and voltage reduction circuit to reduce current fed back to an input power supply; and
operations of the first and second switching elements are intermittent oscillation operations in which an oscillation period for performing onoff switching operations and a suspension period for performing no switching operations are alternately repeated.
30. The switching power supply unit of claim 1, further comprising an output stabilization circuit connected to the secondary winding of the transformer.