Audio signal transmission circuit having a constant level tone-c

Details Audio signal transmission circuit having a constant level tone-c Audio signal transmission circuit having a constant level tone-c

1978-09-21

1980-10-07

Wolff, John H.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

333 28T, H03G 500

Patent

active

042270480

ABSTRACT:
An audio signal transmission circuit comprising a first variable attenuator (i.e. volume controller) from which a level-adjusted audio signal is derived, a tone control circuit connected to the output of the first variable attenuator and supplying a tone-controlled audio signal to a loudspeaker, and a second variable attenuator connected between the tone control circuit and a record terminal and feeding the tone-controlled audio signal to the record terminal. The first and second variable attenuators are mechanically interlocked and arranged in such a way that the sum of their attenuating factors remains constant irrespective of any attenuating operation. At the record terminal there can be obtained the tone-controlled audio output signal with a substantially constant level (amplitude level), irrespective of the level adjusting operation of the signal to the loudspeaker.

REFERENCES:
patent: 2341336 (1944-02-01), Singer
patent: 3732373 (1973-05-01), Boyden
patent: 4054844 (1977-10-01), Oguri
H. P. Walker; "Stereo Mixer"; Wireless World; vol. 77, No. 1428; Jun., 1971; pp. 295-300.
I. Iwamoto; "Multifrequency Responser"; Toshiba Review; Jan.-Feb., 1970; pp. 55-58.

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