Apparatus for matching the sound output of a radio receiver to t

Details Apparatus for matching the sound output of a radio receiver to t Apparatus for matching the sound output of a radio receiver to t

1980-01-23

1981-01-27

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

179 1P, 179 1VL, 330141, 330281, 455246, 455250, H04B 116, H03G 332

Patent

active

042479550

ABSTRACT:
In a circuit which matches the speaker input signal in a car radio to the then-present noise level, an additional RC circuit is interconnected between the speaker input terminal and the input of the volume control element. Sudden increases in the speaker input voltage following a modulation pause which cause a high increase in the gain of the volume control circuit will counteract this gain, thereby preventing the excessive increase in speaker sound output following such a modulation pause which took place in the known circuits. Zener diodes to limit the voltage at the volume control elements in dependence upon the battery output voltage and to a value such that the output stage driving the speaker will not be overdriven are also provided.

REFERENCES:
patent: 2503391 (1950-04-01), Kannenberg
patent: 2564437 (1951-08-01), Kannenberg
patent: 2668874 (1954-02-01), Augustadt
patent: 3410958 (1968-11-01), Cohen
patent: 3497622 (1970-02-01), Markin et al.
patent: 3805177 (1974-04-01), Risley
patent: 4179667 (1979-12-01), Bottcher
Automatic Control of Speaker Output Compensates for Noisy Background-David B. Hoisington et al.-Nov. 20, 1972-"Electronics", pp. 118-121.

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