1. A power amplifier for amplifying a modulated signal including an amplitude-modulated component and a phase-modulated component, comprising:
a decomposing circuit for decomposing said amplitude-modulated component into two control signals;
a mixing circuit for mixing one of the decomposed control signals with said phase-modulated component;
an amplifying circuit for amplifying the other of the decomposed control signals;
an RF amplifier for amplifying a signal output from said mixing circuit, amplitude-modulating the amplified signal with an output signal from said amplifying circuit, and outputting the amplitude-modulated signal;
a signal generating circuit for extracting said amplitude-modulated component of said modulated signal and extracting and outputting the phase-modulated component of said modulated signal, said signal generating circuit including said decomposing circuit; and
a first pulse modulator for pulse-modulating one of the decomposed control signals;
wherein said mixing circuit comprises a mixer for mixing said phase-modulated component extracted by said signal generating circuit and a rectangular-wave signal output from said first pulse modulator, with each other;
said amplifying circuit comprises a second pulse modulator for pulse-modulating the other of the decomposed control signals, a switching amplifier for current-amplifying a rectangular-wave signal output from said second pulse modulator, and a low-pass filter for smoothing an output signal from said switching amplifier; and
said RF amplifier amplifies an output signal from said mixer, amplitude-modulates the amplified signal with an output signal from said low-pass filter, and outputs the amplitude-modulated signal.
2. The power amplifier according to claim 1, further comprising:
a bandpass filter for allowing an output signal from said RF amplifier therethrough to pass through, said bandpass filter having a passband for allowing said modulated signal to pass through and removing spurious components caused by a rectangular-wave signal output from said switching amplifier.
3. The power amplifier according to claim 1, wherein at least one of said two control signals has a smaller dynamic range than the amplitude-modulated component of said modulated signal.
4. The power amplifier according to claim 3, wherein either one of said two control signals is given as a root of the amplitude-modulated component of said modulated signal.
5. The power amplifier according to claim 3, wherein either one of said two control signals comprises a signal proportional to the amplitude-modulated component of said modulated signal when the amplitude-modulated component of said modulated signal is equal to or greater than a preset threshold value, and a signal having a constant value when the amplitude-modulated component of said modulated signal is smaller than said preset threshold value.
6. The power amplifier according to claim 3, wherein either one of said two control signals comprises a signal having a constant value when the amplitude-modulated component of said modulated signal is equal to or greater than a preset threshold value, and a signal proportional to the amplitude-modulated component of said modulated signal when the amplitude-modulated component of said modulated signal is smaller than said preset threshold value.
7. The power amplifier according to claim 6, wherein said signal generating circuit outputs a signal produced by passing the amplitude-modulated component of said modulated signal through the low-pass filter, as one of the control signals which has a smaller band than the amplitude-modulated component of said modulated signal, and outputs a signal, having a value produced by dividing the amplitude-modulated component of said modulated signal by an amplitude component of said one of the control signals, as the other of the control signals.
8. The power amplifier according to claim 1, wherein at least one of said two control signals has a smaller dynamic range than the amplitude-modulated component of said modulated signal, and the control signal whose dynamic range is smaller than the amplitude-modulated component of said modulated signal is supplied to said second pulse modulator.
9. The power amplifier according to claim 1, wherein either one of said two control signals comprises a signal having a higher ratio of a DC component to an AC component than the amplitude-modulated component of said modulated signal.
10. The power amplifier according to claim 9, further comprising:
a linear amplifier for amplifying the control signal having the higher ratio of the DC component to the AC component than the amplitude-modulated component of said modulated signal, using as a feedback signal a signal for amplitude-modulating the output signal from said RF amplifier; and
an adder for adding the output signal from said low-pass filter and an output signal from said linear amplifier to each other, and outputting the sum as the signal for amplitude-modulating the output signal from said RF amplifier, to the RF amplifier.
11. The power amplifier according to claim 9, wherein one of said two control signals which has the higher ratio of the DC component to the AC component than the amplitude-modulated component of said modulated signal is supplied to said second pulse modulator.
12. The power amplifier according to claim 9, wherein either one of said two control signals is given as a root of the amplitude-modulated component of said modulated signal.
13. The power amplifier according to claim 1, wherein at least one of said two control signals has a smaller signal band than the amplitude-modulated component of said modulated signal.
14. A power amplifier for amplifying a modulated signal including an amplitude-modulated component and a phase-modulated component, comprising:
a decomposing circuit for decomposing said amplitude-modulated component into two control signals;
a mixing circuit for mixing one of the decomposed control signals with said phase-modulated component;
an amplifying circuit for amplifying the other of the decomposed control signals;
an RF amplifier for amplifying a signal output from said mixing circuit, amplitude-modulating the amplified signal with an output signal from said amplifying circuit, and outputting the amplitude-modulated signal;
a signal generating circuit for extracting said amplitude-modulated component of said modulated signal and extracting and outputting the phase-modulated component of said modulated signal, said signal generating circuit including said decomposing circuit; and
a first pulse modulator for pulse-modulating one of the decomposed control signals;
wherein said amplifying circuit comprises a second pulse modulator for pulse-modulating the other of the decomposed control signals, a switching amplifier for current-amplifying a rectangular-wave signal output from said second pulse modulator, and a low-pass filter for smoothing an output signal from said switching amplifier; and
said RF amplifier includes said mixing circuit for mixing said phase-modulated component extracted by said signal generating circuit and a rectangular-wave signal output from said first pulse modulator, with each other, amplifies a mixed signal, amplitude-modulates the amplified signal with an output signal from said low-pass filter, and outputs the amplitude-modulated signal.
15. A power amplifier for amplifying a modulated signal including an amplitude-modulated component and a phase-modulated component, comprising:
a decomposing circuit for decomposing said amplitude-modulated component into two control signals;
a mixing circuit for mixing one of the decomposed control signals with said phase-modulated component;
an amplifying circuit for amplifying the other of the decomposed control signals;
an RF amplifier for amplifying a signal output from said mixing circuit, amplitude-modulating the amplified signal with an output signal from said amplifying circuit, and outputting the amplitude-modulated signal;
a signal generating circuit for extracting and outputting said amplitude-modulated component and said phase-modulated component of said modulated signal; and
a pulse modulator for pulse-modulating said amplitude-modulated component extracted by said signal generating circuit;
wherein said decomposing circuit comprises a signal separator for decomposing a pulse-modulated signal output from said pulse modulator into two rectangular-wave control signals, the product of signal components thereof from which rectangular components have been removed being proportional to said amplitude-modulated component, and outputting the decomposed control signals;
said mixing circuit comprises a mixer for mixing one of the decomposed control signals and said phase-modulated component extracted by said signal generating circuit, with each other;
said amplifying circuit comprises a switching amplifier for current-amplifying the other of the decomposed control signals said second amplitude component, and a low-pass filter for smoothing an output signal from said switching amplifier; and
said RF amplifier amplifies an output signal from said mixer, amplitude-modulates the amplified signal with an output signal from said low-pass filter, and outputs the amplitude-modulated signal.
16. A power amplifier for amplifying a modulated signal including an amplitude-modulated component and a phase-modulated component, comprising:
a decomposing circuit for decomposing said amplitude-modulated component into two control signals;
a mixing circuit for mixing one of the decomposed control signals with said phase-modulated component;
an amplifying circuit for amplifying the other of the decomposed control signals;
an RF amplifier for amplifying a signal output from said mixing circuit, amplitude-modulating the amplified signal with an output signal from said amplifying circuit, and outputting the amplitude-modulated signal;
a signal generating circuit for extracting and outputting said amplitude-modulated component and said phase-modulated component of said modulated signal; and
a pulse modulator for pulse-modulating said amplitude-modulated component extracted by said signal generating circuit;
wherein said decomposing circuit comprises a signal separator for decomposing a pulse-modulated signal output from said pulse modulator into two rectangular-wave control signals, the product of signal components thereof from which rectangular components have been removed being proportional to said amplitude-modulated component, and outputting the decomposed control signals;
said amplifying circuit comprises a switching amplifier for current-amplifying the other of the decomposed control signals, and a low-pass filter for smoothing an output signal from said switching amplifier; and
said RF amplifier includes the mixing circuit for mixing said phase-modulated component extracted by said signal generating circuit and one of the decomposed control signals, with each other, amplifies a mixed signal, amplitude-modulates the amplified signal with an output signal from said low-pass filter, and outputs the amplitude-modulated signal.
17. A power amplifier for amplifying a modulated signal including an amplitude-modulated component and a phase-modulated component, comprising:
a decomposing circuit for decomposing said amplitude-modulated component into two control signals;
a mixing circuit for mixing one of the decomposed control signals with said modulated signal;
an amplifying circuit for amplifying the other of the decomposed control signals;
an RF amplifier for amplifying a signal output from said mixing circuit, amplitude-modulating the amplified signal with an output signal from said amplifying circuit, and outputting the amplitude-modulated signal;
a signal generating circuit for extracting said amplitude-modulated component of said modulated signal, said signal generating circuit including said decomposing circuit; and
a first pulse modulator for pulse-modulating one of the decomposed control signals;
wherein said mixing circuit comprises a mixer for mixing said modulated signal and a rectangular-wave signal output from said first pulse modulator;
said amplifying circuit comprises a second pulse modulator for pulse-modulating the other of the decomposed control signals, a switching amplifier for current-amplifying a rectangular-wave signal output from said second pulse modulator, and a low-pass filter for smoothing an output signal from said switching amplifier; and
said RF amplifier amplifies an output signal from said mixer, amplitude-modulates the amplified signal with an output signal from said low-pass filter, and outputs the amplitude-modulated signal.
18. The power amplifier according to claim 17, further comprising:
a bandpass filter for allowing an output signal from said RF amplifier therethrough to pass through, said bandpass filter having a passband for allowing said modulated signal to pass through and removing spurious components caused by a rectangular-wave signal output from said switching amplifier.
19. A power amplifier for amplifying a modulated signal including an amplitude-modulated component and a phase-modulated component, comprising:
a decomposing circuit for decomposing said amplitude-modulated component into two control signals;
a mixing circuit for mixing one of the decomposed control signals with said modulated signal;
an amplifying circuit for amplifying the other of the decomposed control signals;
an RF amplifier for amplifying a signal output from said mixing circuit, amplitude-modulating the amplified signal with an output signal from said amplifying circuit, and outputting the amplitude-modulated signal;
a signal generating circuit for extracting said amplitude-modulated component of said modulated signal, said signal generating circuit including said decomposing circuit; and
a first pulse modulator for pulse-modulating one of the decomposed control signals;
wherein said amplifying circuit comprises a second pulse modulator for pulse-modulating the other of the decomposed control signals, a switching amplifier for current-amplifying a rectangular-wave signal output from said second pulse modulator, and a low-pass filter for smoothing an output signal from said switching amplifier; and
said RF amplifier includes said mixing circuit for mixing said modulated signal and a rectangular-wave signal output from said first pulse modulator, with each other, amplifies a mixed signal, amplitude-modulates the amplified signal with an output signal from said low-pass filter, and outputs the amplitude-modulated signal.
20. A power amplifier for amplifying a modulated signal including an amplitude-modulated component and a phase-modulated component, comprising:
a decomposing circuit for decomposing said amplitude-modulated component into two control signals;
a mixing circuit for mixing one of the decomposed control signals with said modulated signal;
an amplifying circuit for amplifying the other of the decomposed control signals;
an RF amplifier for amplifying a signal output from said mixing circuit, amplitude-modulating the amplified signal with an output signal from said amplifying circuit, and outputting the amplitude-modulated signal;
a signal generating circuit for extracting said amplitude-modulated component of said modulated signal; and
a pulse modulator for pulse-modulating said amplitude-modulated component extracted by said signal generating circuit;
wherein said decomposing circuit comprises a signal separator for decomposing a pulse-modulated signal output from said pulse modulator into two rectangular-wave control signals, the product of signal components thereof from which rectangular components have been removed being proportional to said amplitude-modulated component, and outputting the decomposed control signals;
said mixing circuit comprises a mixer for mixing one of the decomposed control signals and said modulated signal with each other;
said amplifying circuit comprises a switching amplifier for current-amplifying the other of the decomposed control signals, and a low-pass filter for smoothing an output signal from said switching amplifier; and
said RF amplifier amplifies an output signal from said mixer, amplitude-modulates the amplified signal with an output signal from said low-pass filter, and outputs the amplitude-modulated signal.
21. A power amplifier for amplifying a modulated signal including an amplitude-modulated component and a phase-modulated component, comprising:
a decomposing circuit for decomposing said amplitude-modulated component into two control signals;
a mixing circuit for mixing one of the decomposed control signals with said phase-modulated component;
an amplifying circuit for amplifying the other of the decomposed control signals;
an RF amplifier for amplifying a signal output from said mixing circuit, amplitude-modulating the amplified signal with an output signal from said amplifying circuit, and outputting the amplitude-modulated signal;
a signal generating circuit for extracting said amplitude-modulated component of said modulated signal; and
a pulse modulator for pulse-modulating said amplitude-modulated component extracted by said signal generating circuit;
wherein said decomposing circuit comprises a signal separator for decomposing a pulse-modulated signal output from said pulse modulator into two rectangular-wave control signals, the product of signal components thereof from which rectangular components have been removed being proportional to said amplitude-modulated component, and outputting the decomposed control signals;
said amplifying circuit comprises a switching amplifier for current-amplifying the other of the decomposed control signals, and a low-pass filter for smoothing an output signal from said switching amplifier; and
said RF amplifier includes the mixing circuit for mixing said modulated signal and one of the decomposed control signals with each other, amplifies a mixed signal, amplitude-modulates the amplified signal with an output signal from said low-pass filter, and outputs the amplitude-modulated signal.
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 method of recording source data on an optical disk in the event of a buffer-underrun in an optical disk drive which buffers the source data received from a host computer and writes the source data on the optical disk, comprising the steps of:
determining whether the optical disk is a CD-R (Compact Disk-Recordable) or a CD-RW (CD-ReWritable);
detecting an address next to a recording end of the source data recorded on the optical disk upon occurrence of the buffer-underrun, if the optical disk is the CD-R;
designating the detected address as a program start address of the optical disk;
transmitting a signal indicative of the buffer-underrun to the host computer;
causing the host computer to re-transmit the source data to the optical disk drive; and
re-writing the source data on the optical disk, beginning from the program start address.
2. The method of claim 1, further comprising the steps of:
designating a start position of a data recording area of the optical disk as the program start address if the optical disk is a CD-RW;
transmitting the signal indicative of the buffer-underrun generation to the host computer;
causing the host computer to re-transmit the source data to the optical disk drive; and
re-writing the source data on the optical disk, beginning from the program start address.
3. The method of claim 1, wherein the step of re-writing the source data on the optical disk comprises the step of re-writing the source data at a minimum recording rate of the optical disk drive.
4. The method of claim 2, wherein the steps of re-writing the source data on the optical disk each comprise the step of re-writing the source data at a minimum recording rate of the optical disk drive.
5. The method of claim 1, wherein the step of re-writing the source data on the optical disk comprises the step of setting a rotational speed of a spindle motor which rotates the optical disk to a minimum necessary to perform the re-writing of the source data on the optical disk.
6. The method of claim 1, wherein the steps of re-writing the source data on the optical disk each comprise the step of setting a rotational speed of a spindle motor which rotates the optical disk to a minimum necessary to perform the re-writing of the source data on the optical disk.
7. The method of claim 1, wherein the step of detecting an address next to a recording end of the source data comprises the step of recording dummy data from a current recording position at a point in time that the buffer-underrun occurs to an end of a partially recorded current block address.
8. The method claim 7, wherein the data write is performed by predetermined block units.
9. The method of claim 1, further comprising the step of storing the program start address in a Table of Contents (TOC) area of the optical disk.
10. The method of claim 7, further comprising the step of storing the program start address in a Table of Contents (TOC) area of the optical disk.
11. The method of claim 1, wherein the step of determining whether the optical disk is a CD-R or a CD-RW comprises the steps of:
sensing a frequency of wobbles formed at boundaries between tracks of the optical disk, wherein an optical pickup is focused across the boundaries, if the optical disk has the ATIP data; and
determining whether the optical disk is the CD-R or the CD-RW based upon the frequency of the wobbles.
12. The method of claim 3, wherein the step of determining whether the optical disk is a CD-R or a CD-RW comprises the steps of:
determining whether the optical disk has Absolute Time In Pregroove (ATIP) data;
sensing a frequency of wobbles formed at boundaries between tracks of the optical disk, wherein an optical pickup is focused across the boundaries, if the optical disk has the ATIP data; and
determining whether the optical disk is the CD-R or the CD-RW based upon the frequency of the wobbles.
13. The method of claim 7, wherein the step of determining whether the optical disk is a CD-R or a CD-RW comprises the steps of:
determining whether the optical disk has Absolute Time In Pregroove (ATIP) data;
sensing a frequency of wobbles formed at boundaries between tracks of the optical disk, wherein an optical pickup is focused across the boundaries, if the optical disk has the ATIP data; and
determining whether the optical disk is the CD-R or the CD-RW based upon the frequency of the wobbles.
14. The method of claim 2, further comprising the step of erasing the source data written on the optical disk prior to the buffer-underrun, prior to re-writing the source data on the optical disk, if the optical disk is the CD-RW.
15. The method of claim 1, wherein the step of causing the host computer to retransmit the source data to the optical disk drive comprises the step of re-transmitting the entire amount of the source data to be written on the optical disk to the optical disk drive.
16. A method of recording source data on an optical disk in the event of a buffer-underrun in an optical disk drive which buffers the source data received from an external source and writes the source data on the optical disk, comprising the steps of:
determining an address next to a recording end of the source data recorded on the optical disk prior upon occurrence of the buffer-underrun;
receiving the source data again from the external source in the event of the buffer-underrun; and
writing the source data received again from the external source on the optical disk, beginning from the address next to the recording end.
17. The method of claim 16, wherein the optical disk is a CD-R (Compact Disk-Recordable).
18. The method of claim 16, wherein the step of determining an address next to the recording end comprises the step of:
writing dummy data from the recording end to an end of a current partially recorded current block address.
19. The method of claim 16, wherein the address next to the recording end is a next block address.
20. The method of claim 16, wherein the step of writing the source data again on the optical disk comprises the step of setting a rotational speed of a spindle motor which rotates the optical disk to a minimum necessary to perform the re-writing of the source data on the optical disk
21. The method of claim 16, further comprising the step of writing the address next to the recording end in a Table of Contents (TOC) area of the optical disk.
22. A method of recording source data on an optical disk in the event of a buffer-underrun in an optical disk drive which buffers the source data received from an external source and writes the source data on the optical disk, comprising the steps of:
stopping a writing of the source data on the optical disk if the buffer-underrun occurs;
designating a start position of a data recording area of the optical disk as a program start address;
receiving the source data again from the external source in the event of the buffer-underrun; and
writing the source data received again from the external source on the optical disk, beginning from the program start address.
23. The method of claim 22, wherein the optical disk is a CD-RW (Compact Disk-ReWritable).
24. An apparatus for recording source data on an optical disk in the event of a buffer-underrun in an optical disk drive which buffers the source data received from an external source and writes the source data on the optical disk, comprising:
a buffer memory to buffer the source data from the external source;
an optical pickup unit to write the source data from the buffer memory on the optical disk; and
a processing unit to determine whether the buffer memory is empty during the writing of the source data on the optical disk , to provide a buffer-underrun, determining an address next to a recording end of the source data recorded on the optical disk prior upon occurrence of the buffer-underrun or a start position of a data recording area of the optical disk as a program start address, causing the buffer memory to receive the source data again from the external source in the event of the buffer-underrun, and causing the optical pickup unit to write the source data received again from the external source on the optical disk, beginning from the program start address.
25. The apparatus of claim 24, wherein the address next to the recording end of the source is the program start address if the optical disk is a CD-R (Compact Disk-Recordable).
26. The apparatus of claim 24, wherein the start position of the data recording area of the optical disk is the program start address if the optical disk is a CD-RW (Compact Disk-ReWritable).