1. A servo write head configured to simultaneously write a same one of a first or a second single servo pattern in respective servo bands on linear magnetic tape, where centerlines of the servo pattern of each of the servo bands are substantially uniformly spaced in the lateral direction and where the respective servo patterns of all adjacent servo bands are displaced relative to each other in a longitudinal direction by a fraction of a length of a servo frame of the same one of the first or the second servo pattern, the fraction being set in accordance with a type of the same one of the first or the second servo pattern and the fraction set for and a displacement of the first servo pattern being different from the fraction set for and a displacement of the second servo pattern.
2. The servo head according to claim 1, wherein the first or the second servo pattern comprises an M-shaped servo pattern.
3. The servo head according to claim 1, wherein the first or the second servo pattern comprises an N-shaped servo patterns.
4. The servo head according to claim 1, wherein the first or the second servo pattern comprises a V-shaped servo patterns.
5. The servo head according to claim 1, wherein a number of the respective servo bands is five.
6. The servo head according to claim 1, wherein a number of the respective servo bands is seven.
7. The servo head according to claim 1, wherein a number of the respective servo bands is nine.
8. The servo head according to claim 1, wherein the servo first or the second pattern is oriented with an absolute value of an azimuth of 6 degrees from to the lateral direction.
9. The servo head according to claim 1, wherein the first or the second servo pattern is oriented with an absolute value of an azimuth that is greater than 6 degrees but less than 24 degrees from to the lateral direction.
10. A servo control system for use in reading information from the servo pattern written on linear magnetic tape, and for use in writing data to and reading data from linear magnetic tape, the system comprising:
a read-write head configured to simultaneously read a same one of a first or a second single servo pattern in servo bands on the magnetic tape, where centerlines of the servo pattern of each of the servo bands are substantially uniformly spaced in the lateral direction and where the respective servo pattern of all adjacent servo bands are displaced relative to each other in a longitudinal direction by one of a first or a second fraction of a length of a servo frame of the same one of the first or the second servo pattern, the first fraction being set in accordance with a type of the first servo pattern and the second fraction being set in accordance with a type of the second servo pattern such that a displacement of the first servo pattern is different from a displacement of the second servo pattern; and
at least two parallel servo channels for processing readback servo signals obtained from at least two servo readers reading the servo pattern of each of the servo bands enable a computation of y-estimates for use in servo control of the read-write head.
11. The system according to claim 10, wherein the two parallel servo channels are further configured to decode information about a servo band ID in a reserved field in a longitudinal position (LPOS) word disposed therein.
12. The system according to claim 10, wherein at least four y-estimates are obtained from the readback servo signals per servo frame.
13. The system according to claim 12, wherein the computation of the y-estimates is independent of written-in velocity errors.
14. The system according to claim 12, wherein a most recent measure of a servo frame interval that is independent of written-in velocity errors is employed for the computation of the y-estimates.
15. The system according to claim 10, wherein at least two y-estimates are obtained from the readback servo signals per servo frame.
16. The system according to claim 15, wherein the computation of the y-estimates is independent of written-in velocity errors.
17. A servo pattern write head, comprising:
at least one yoke of ferromagnetic material;
at least one coil, to which current is applied, wrapped around a portion of the yoke to generate a magnetic flux therein; and
a tape-bearing portion of a housing into which the at least one yoke extends, including gaps through which the magnetic flux generated in the yoke extends, the gaps being arranged such that the magnetic flux is configured to simultaneously write a same one of a first or a second single servo pattern in respective servo bands with centerlines of the servo pattern of each of the servo bands being substantially uniformly spaced in the lateral direction, and where the respective servo pattern of all adjacent servo bands are displaced relative to each other in a longitudinal direction by one of a first or a second fraction of a length of a servo frame of the same one of the first or the second servo pattern, the first fraction being set in accordance with a type of the first servo pattern and the second fraction being set in accordance with a type of the second servo pattern and the fraction set for and a displacement of the first servo pattern being different from the fraction set for and a displacement of the second servo pattern.
18. A system, including the servo pattern write head of claim 17, and further comprising:
a magnetic recording medium, to which servo patterns are written by the servo write head, disposed proximate to the servo head; and
a controller, electrically coupled to the servo write head, which is configured to control the writing of the servo patterns to the magnetic recording medium.
19. The system according to claim 18 wherein the controller is configured to encode linear position (LPOS) information in the written servo patterns.
20. The system according to claim 19 wherein the controller is further configured to encode information about a servo band ID in a reserved field in a longitudinal position (LPOS) word disposed therein.
21. The system according to claim 18, wherein the controller is configured to control a timing of an application of current pulses to the at least one coil in the servo write head to achieve a desired longitudinal displacement of the servo patterns.
22. A method of writing a same one of a first or a second servo pattern in respective servo bands on linear magnetic tape, the method comprising:
spacing centerlines of the servo pattern of each of the servo bands substantially uniformly in a lateral direction; and
displacing the respective servo pattern of all adjacent servo bands relative to each other in a longitudinal direction by one of a first or a second fraction of a length of a servo frame of the same one of the first or the second servo pattern, the first fraction being set in accordance with a type of the first servo pattern and the second fraction being set in accordance with a type of the second servo pattern and being different from the first fraction such that the respective displacements of the first and second servo patterns are different.
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. An apparatus for frequency shifting of a first spread-spectrum signal, the apparatus comprising:
a first port for receiving the first spread-spectrum signal in a first frequency band; a first IQ demodulator coupled to the first port to receive the first spread-spectrum signal from the first port, for deriving the I and Q component signals of the first spread spectrum signal;
a first IQ modulator coupled to the first IQ demodulator to receive the first spread spectrum signal I and Q component signals, the first IQ modulator being operative to reconstruct the first spread-spectrum signal and to frequency shift the first spread-spectrum signal to a second frequency band;
a second port coupled to the first IQ modulator to receive the frequency shifted signal from the first IQ modulator;
a third port for receiving the second spread-spectrum signal in the second frequency band;
a second IQ demodulator coupled to the third port to receive the second spread-spectrum signal from the third port;
a first filter coupled to the first port for substantially passing only signals in the first frequency band; a first threshold detector coupled to the first filter for detecting the presence of a signal in the first frequency band; and
a second filter coupled to the third port for substantially passing only signals in the second frequency band; and a second threshold detector coupled to the second filter for detecting the presence of a signal in the second frequency band.
2. The apparatus of claim 1, wherein the apparatus performs frequency shifting of a second spread-spectrum signal without protocol conversion from the second frequency band to the first distinct frequency band.
3. The apparatus of claim 1, wherein the second port is coupled to the first IQ modulator for outputting the frequency shifted first spread spectrum signal in the second frequency band.
4. The apparatus of claim 3, wherein the apparatus performs wherein the second IQ demodulator is coupled to the third port to receive the second spread-spectrum signal from the third port for deriving the I and Q component signals of the second spread-spectrum signal.
5. The apparatus of claim 4, wherein the apparatus performs frequency shifting of a second spread-spectrum signal without protocol conversion from the second frequency band to the first distinct frequency band.
6. The apparatus of claim 5, further comprising:
a second IQ modulator coupled to the second IQ demodulator to receive the second spread spectrum signal I and Q component signals, the second IQ demodulator being operative to reconstruct the second spread-spectrum signal frequency shifted to the first frequency band; and
a fourth port coupled to the second IQ modulator to receive the frequency shifted signal from the second IQ modulator, for outputting the frequency shifted second spread-spectrum signal in the first frequency band.
7. The apparatus of claim 6, wherein the apparatus is operative to be in a selected on of distinct first and second states, wherein in the first state a signal is received at the first port and output frequency shifted at the second port, and wherein in the second state a signal is received at the third port and output frequency shifted at the fourth port.
8. The apparatus of claim 6, wherein the first and third ports are connected to each other, and wherein the second and fourth ports are connected to each other.
9. The apparatus of claim 5, wherein the second port is coupled to the first IQ modulator for outputting the frequency shifted first spread spectrum signal in the second frequency band.
10. The apparatus of claim 3, wherein the apparatus performs frequency shifting of the first spread-spectrum signal without protocol conversion from a first frequency band and the second frequency band is distinct from the first frequency band.
11. The apparatus of claim 1, wherein the apparatus performs frequency shifting of the first spread-spectrum signal without protocol conversion from a first frequency band and the second frequency band is distinct from the first frequency band.
12. The apparatus of claim 1, wherein at least one of the first spread-spectrum signal and the frequency shifted first spread-spectrum signal is a wireless signal, and at least one output of the first and second ports is an antenna.
13. The apparatus of claim 1, further comprising a single enclosure housing the first and second ports, the first IQ demodulator and the first IQ modulator, and wherein the single enclosure is wall mountable, wherein the single enclosure is shaped to plug into an outlet.
14. An apparatus for coupling a wireless signal to a plurality of wired mediums, for use with a first wireless unit having an antenna connector and operative to receive and transmit the wireless signal in a wireless frequency band, a second wireless unit, and with a plurality of distinct wired mediums, each operative for conductive signals in a wired frequency band, the apparatus comprising:
a coaxial connector for connecting to the antenna connector of the wireless unit for receiving and transmitting the wireless signal in the wireless frequency band;
a plurality of wiring connectors each for connecting to a distinct wired medium;
a frequency shifter connected for frequency shifting between the wireless frequency band and the wired frequency band;
a wired band splitter connected to the frequency shifter and having multiple ports, each port connected to a wiring connector, the splitter being operative to share a signal in the wired frequency band with all devices connected thereto;
an equalizer between one of the wiring connectors and the wired band splitter for compensating for the frequency characteristics of the wired medium;
an antenna for receiving and transmitting the wireless signal in the wireless frequency band; and an RF splitter connected between the antenna, the attenuator, and the coaxial connectors; and
between at least one of the wiring connectors and the wired band splitter a filter for substantially passing only signals in the wired frequency band and a signal transformer for providing isolation between the apparatus and the wired medium.
15. The apparatus of claim 14, wherein the wireless signal is a spread-spectrum signal based on a multi-carrier signal modulated according to one of OFDM, DMT, and CDMA modulations.
16. The apparatus of claim 14, wherein at least one of the wired mediums is further connected to carry a DC or AC power signal, and the apparatus further comprises:
a high pass filter for substantially passing signals in the wired frequency band coupled between the wired frequency splitter and at least one of the wiring connectors;
a power connector for connecting to an AC power source;
a power supply, including an ACDC or ACAC converter, connected to be power from the power connector; and
a low pass or band pass filter coupled between the power supply and the wiring connector for substantially passing the power signal.
17. The apparatus of claim 14, wherein the apparatus is further adapted to be powered by a DC or AC power signal carried over at least one wired medium, and the apparatus further comprises:
a high pass filter coupled between the wired frequency band switch and at least one of the wiring connectors for substantially passing signals in the wired frequency band;
a power supply, including an ACDC or DCDC converter, coupled to power at least the frequency shifter; and
a low pass or band pass filter coupled between the power supply and the wiring connector for substantially passing the power signal.
18. The apparatus of claim 14, wherein at least one of the wired mediums is connected to further carry an analog telephone signal, and the apparatus further comprises:
a high pass filter coupled between the wired frequency band splitter and at least one of the wiring connectors for substantially passing signals in the wired frequency band;
a telephone connector for connecting to a telephone set or to a PBXPABXCO; and
a low pass filter coupled between one of the wiring connectors and the telephone connector for substantially passing the telephone signal.
19. The apparatus of claim 14, wherein at least one of the wired mediums is a coaxial cable connected to carry a CATV signal, and the apparatus further comprises:
a band pass filter coupled between the wired frequency band splitter and at least one of the wiring connectors for substantially passing signals in the wired frequency band;
an additional coaxial connector for connecting to a CATV appliance; and
a second band pass filter coupled between the wiring connector and the additional coaxial connector for substantially passing the CATV signal.