Audio processor for single, channel, matrixed two-channel and un

Details Audio processor for single, channel, matrixed two-channel and un Audio processor for single, channel, matrixed two-channel and un

1981-03-30

1983-07-12

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Storage or retrieval of spatially related acoustic signals

369 61, 358342, 179 1GM, G11B 374, G11B 2736, H04N 576, H04H 500

Patent

active

043934897

ABSTRACT:
Audio signals recovered from a video disc record are applied to a dual mode decoder matrix via track and hold circuits which mute the audio signals in response to defect indicating signals and player mode control signals. A selected one of the mode control signals is applied to the matrix for causing the matrix to form sum and difference output signals at first and second output terminals thereof when at a first logic level and for causing the matrix to produce identical output signals at the output terminals when at a second logic level. Logic circuitry controls the muting and the matrix operating mode to provide compatibility with monophonic, matrixed two channel (e.g., stereophonic) and un-matrixed two channel (e.g., bilingual) video disc records and suppression of record noise in all operating modes.

REFERENCES:
patent: 3969756 (1976-07-01), Pamer et al.
patent: 4119812 (1978-10-01), Fox
patent: 4157455 (1979-06-01), Okatani et al.
patent: 4194087 (1980-03-01), Sakaida
patent: 4221930 (1980-09-01), Okuno
patent: 4280101 (1981-07-01), Ishida et al.
patent: 4309722 (1982-01-01), Palmer
patent: 4323934 (1982-04-01), Giraud
"Microelectronics, Digital and Analog Systems", Millman/McGraw-Hill Book Co., (1979), pp. 631, 632.
Radio Electronics, "Videodisc, a Look at the Circuitry", Stecker, Jul. 1979, pp. 39, 40.

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