1
Katsuaki Matsumoto, Yoshifumi Saeki, Osamu Tazawa, Minoru Kosaka, Masaki Saito, Hiroki Uemura, Tetuo Kanazashi, Seiji Hashimoto, Tsuyoshi Fujiwara, Tsutomu Fukui, Saburo Takaoka, Tsutomu Suzuki, Shozo Nakamuta, Toshihiko Hosaka, Kuniaki Shiratori, Youichiro Tsuda, Takashi Morii, Sumitaka Matsumura, Morihisa Oka: Interactive CATV system. Pioneer Electronic Corporation, Fraser and Bogucki, January 13, 1981: US04245245 (278 worldwide citation)

A two-way CATV system having a substantial number of terminals incorporates a central processor and transmitter system which continually interrogates the terminals at high speed, monitoring changes of usage of premium programs and other data while also permitting central control of access to restric ...


2
Saburo Takaoka, Ryuichi Naito, Fumihiko Yokogawa, Youichi Ogawa: Digital modulation signal reading device. Pioneer Electronic Corporation, Sughrue Mion Zinn Macpeak and Seas, September 10, 1985: US04540897 (19 worldwide citation)

A data reading device for reading out data modulated according to a system wherein the time ratio of low to high level signals is substantially unity employs a time ratio detector and an intermediate level detector. A comparator compares the reproduced output level with a synthesized signal which ma ...


3
Haruyuki Inohana, Saburo Takaoka, Hideaki Takada: Waveform equalization circuit for a magnetic reproducing device. Pioneer Electronic Corporation, Hitachi, Sughrue Mion Zinn Macpeak & Seas, December 26, 1989: US04890170 (13 worldwide citation)

In a waveform equalization circuit, a digital signal is applied through a first network having a transfer function defined by four angular frequencies to one of the inversion and non-inversion input terminals of an amplifier and through a second network having a transfer function made up of a consta ...


4
Saburo Takaoka, Ryozi Higashi, Hiroyuki Hirano: Tone control circuit utilizing variable gain amplifier. Pioneer Electronic Corporation, Sughrue Mion Zinn Macpeak and Seas, May 4, 1982: US04328465 (8 worldwide citation)

A tone control circuit includes a variable gain amplifier circuit, a first mixer combining the variable gain amplifier output with a tone control circuit input and providing its output signal to the variable gain amplifier input, and a second mixer combining the outputs of the first mixer and variab ...


5
Saburo Takaoka, Fumihiko Yokogawa, Tadahiro Yamaguchi: Audio signal compression and expansion system. Pioneer Electronic Corporation, Sughrue Rothwell Mion Zinn and Macpeak, March 20, 1979: US04145664 (8 worldwide citation)

The auxilliary signal path in a compander system includes, in series, a first amplifier 7, a weighting function amplifier 8, and a detection circuit 9. The output of the latter controls the gain of a voltage-controlled variable gain circuit 11 also connected to the first amplifier output, and the in ...


6
Saburo Takaoka, Ryozi Higashi: Tone control arrangement for use in sound reproducing instruments. Pioneer Electronic Corporation, Sughrue Mion Zinn Macpeak and Seas, September 15, 1981: US04289928 (6 worldwide citation)

A tone control arrangement is disclosed which is suitable for use in various sound reproducing instruments and in which the signal-to-noise ratio of the reproduced sound can be improved by controlling the frequency response of the audible signal with a variable d.c. voltage source. Frequency respons ...


7
Saburo Takaoka: Speed-and-phase control circuit for a rotary machine. Pioneer Electronic Corporation, Sughrue Rothwell Mion Zinn and Macpeak, December 4, 1979: US04177411 (5 worldwide citation)

A speed-and-phase control circuit for a rotary machine. A frequency divider is responsive to an input signal whose frequency is proportional to the revolution number of the rotary machine. The frequency divider provides as a first output signal a frequency-divided version of the input signal. A logi ...


8
Saburo Takaoka, Norikazu Fujie: Stator winding control circuit for a brushless d.c. motor. Pioneer Electronic Corporation, Sughrue Rothwell Mion Zinn and Macpeak, January 3, 1978: US04066935 (5 worldwide citation)

A brushless d.c. motor includes a plurality of Hall elements 1-3 for detecting the relative positions of the rotor and stator poles, a comparator circuit 103 responsive to a bipolar input control signal A for generating an output signal B proportional to the absolute magnitude of signal A and an out ...


9
Saburo Takaoka: Period-to-voltage converting device. Pioneer Electronic Corporation, Sughrue Rothwell Mion Zinn and Macpeak, April 8, 1980: US04197508 (4 worldwide citation)

A period-to-voltage converting device for producing an output voltage corresponding to the varying period of an input signal. The input signal is applied to a frequency divider and a simple logic circuit to control the charging and discharging of first and second capacitors. A charging circuit respo ...


10
Saburo Takaoka, Youichiro Tsuda: Device for improving output waveform of manually controllable pulse generator for use in preset electronic tuning control device. Pioneer Electronic Corporation, Sughrue Rothwell Mion Zinn and Macpeak, July 1, 1980: US04210828 (2 worldwide citation)

An output waveform of a manually operable tuning pulse generator of an electronic preset type tuning control device of a tuner using varactor diodes for a multi-band radio receiver is improved by using Schmitt trigger circuit means which may be provided with a trigger level checking circuit, both be ...