| Patent | Date |
|---|
Spread spectrum modulating and demodulating apparatus for transmission and reception of FSK and PSK signals
Grant 5,832,027 - Ishigaki November 3, 1 | 1998-11-03 |
Frequency converting circuit
Grant 5,760,622 - Ishigaki June 2, 1 | 1998-06-02 |
Frequency converting circuit
Grant 5,648,736 - Ishigaki July 15, 1 | 1997-07-15 |
Spread spectrum modulating apparatus using either PSK or FSK primary modulation
Grant 5,539,770 - Ishigaki July 23, 1 | 1996-07-23 |
Receiving device for receiving and demodulating spread spectrum-modulated GPS wave
Grant 5,402,442 - Ishigaki March 28, 1 | 1995-03-28 |
Spread spectrum communication system
Grant 4,977,578 - Ishigaki , et al. December 11, 1 | 1990-12-11 |
Spread spectrum communication system
Grant 4,953,178 - Ishigaki August 28, 1 | 1990-08-28 |
Spread spectrum communication system
Grant 4,943,976 - Ishigaki July 24, 1 | 1990-07-24 |
Phase-locked loop circuit
Grant 4,888,564 - Ishigaki December 19, 1 | 1989-12-19 |
Circuit for reconstructing noise-affected signals
Grant 4,626,788 - Ishigaki December 2, 1 | 1986-12-02 |
Quarternary differential PSK demodulator
Grant 4,614,910 - Ishigaki , et al. September 30, 1 | 1986-09-30 |
Noise reduction for stereophonic FM signals by high-speed sampling and linear interpolation
Grant 4,574,390 - Hirohashi , et al. March 4, 1 | 1986-03-04 |
Noise reducing apparatus
Grant 4,449,106 - Ishigaki , et al. May 15, 1 | 1984-05-15 |
Noise reduction by integrating frequency-split signals with different time constants
Grant 4,442,546 - Ishigaki April 10, 1 | 1984-04-10 |
Noise reducing apparatus
Grant 4,430,754 - Ishigaki February 7, 1 | 1984-02-07 |
Variable-directivity microphone device
Grant 4,412,097 - Ishigaki , et al. October 25, 1 | 1983-10-25 |
Variable directional microphone system
Grant 4,399,327 - Yamamoto , et al. August 16, 1 | 1983-08-16 |
Noise reduction system having series connected variable frequency filters
Grant 4,363,006 - Ishigaki , et al. December 7, 1 | 1982-12-07 |
Variable-directivity microphone device
Grant 4,354,059 - Ishigaki , et al. October 12, 1 | 1982-10-12 |
Apparatus for automatic selective switching and transmission of input signals
Grant 4,347,510 - Ishigaki , et al. August 31, 1 | 1982-08-31 |
Multipath distortion compensation circuit and method
Grant 4,266,296 - Ishigaki May 5, 1 | 1981-05-05 |
System for removing interference distortion in the demodulated signal of a frequency-modulated signal
Grant 4,246,541 - Ishigaki January 20, 1 | 1981-01-20 |
Circuit arrangement for eliminating waveform distortion of an angle-modulated signal transmitted over multipaths
Grant 4,211,979 - Muraoka , et al. July 8, 1 | 1980-07-08 |
Cancellation of interference distortions caused by intermodulation between FM signals on adjacent channels
Grant 4,204,091 - Ishigaki , et al. May 20, 1 | 1980-05-20 |
System for removing interference distortion in the demodulated signal of a frequency-modulated signal
Grant 4,166,251 - Ishigaki , et al. August 28, 1 | 1979-08-28 |
System for demodulating angle-modulated signals
Grant 4,079,330 - Ishigaki , et al. March 14, 1 | 1978-03-14 |
System for demodulating angle-modulated signals
Grant 4,066,972 - Ishigaki , et al. January 3, 1 | 1978-01-03 |
Phase locked loop circuit
Grant 4,027,274 - Fukui , et al. May 31, 1 | 1977-05-31 |
Phase locked loop angle modulation system with large modulation index
Grant 4,009,455 - Ishigaki , et al. February 22, 1 | 1977-02-22 |
Angle-modulated signal transmission system
Grant 4,002,840 - Abe , et al. January 11, 1 | 1977-01-11 |
Signal frequency band control system
Grant 3,983,505 - Ishigaki , et al. September 28, 1 | 1976-09-28 |
System for a multichannel record disc with crosstalk compensation provided during recording
Grant 3,896,271 - Ishigaki , et al. July 22, 1 | 1975-07-22 |
Compression And/or Expansion System And Circuit
Grant 3,795,876 - Takahashi , et al. March 5, 1 | 1974-03-05 |
Noise Reduction System And Apparatus Using A Compression And Expansion System
Grant 3,757,254 - Takahashi , et al. September 4, 1 | 1973-09-04 |
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