Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1977-07-21
1981-09-15
Nusbaum, Mark E.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
333 28T, H04M 100
Patent
active
042899281
ABSTRACT:
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 response control by a single d.c. control voltage is achieved by connecting in series and in order a first mixer, passive circuit network having a signal transmission characteristic determined by the desired frequency response of the output sound signal to be reproduced, a multiplier and a second mixer. The inverting inputs of the first and second mixers both receive the output of the multiplier, while the non-inverting input of the first mixer receives the input audio signal. The non-inverting input of the second mixer receives either the output of the first mixer or the input audio signal. Finally, the second input to the multiplier is provided by a variable d.c. voltage source. Tone control is achieved through a single control member even in the case of multi-channel systems by either using a single potentiometer wiper in common as the second input to each of the multipliers in the respective channels, or by ganging together a plurality of potentiometer wipers for control by a single member.
REFERENCES:
patent: 3313885 (1967-04-01), Aiken
patent: 3729693 (1973-04-01), Dolby
patent: 3849601 (1974-11-01), Goncharoff
patent: 3875334 (1975-04-01), Hilbert et al.
patent: 4004253 (1977-02-01), Takasaki et al.
Higashi Ryozi
Takaoka Saburo
Kemeny E. S.
Nusbaum Mark E.
Pioneer Electronic Corporation
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