Noise reduction system

Details Noise reduction system Noise reduction system

1982-08-27

1984-10-09

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

330295, G11B 545, G11B 502

Patent

active

044765029

ABSTRACT:
A noise reduction system is provided which can operate as either a Dolby B-type or C-type system. In either case, an input signal is applied to the variable impedance of a high-level side chain through an identical shared filter circuit network. The high-level side chain has two voltage-current converters for controlling the variable impedance. By substantially inhibiting the operation of one of the two converters, the system operates as a C-type Dolby system. On the other hand, when the system operates as a B-type Dolby system, a bias current is applied to each of the two converters during periods of no input signal. This bias current is about half of a minute bias control current which is applied during no signal periods to the single converter used when the system operates as the C-type Dolby system.

REFERENCES:
patent: 4263624 (1981-04-01), Gundry

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