Audio playback systems

Details Audio playback systems Audio playback systems

1978-09-15

1980-09-02

Konick, Bernard

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330109, 330294, 333 28T, H03G 516

Patent

active

042208173

ABSTRACT:
Improved circuitry for providing bass control in audio playback systems using feedback circuits wherein undesirable deviations in frequency response above the bass region exhibited by previously available Baxandall feedback circuits are substantially eliminated by utilizing, in a preferred embodiment, a voltage follower amplifier, such as an emitter-follower transistor circuit in association with a single capacitance in the bass control circuit, which eliminates the undesirable frequency response deviations at the mid-frequency and higher frequency ranges so that frequency response curves at all settings of the bass control substantially coincide above the bass region.

REFERENCES:
patent: 3130374 (1964-04-01), Beres et al.
patent: 3449681 (1969-06-01), Hafler
patent: 3460071 (1969-08-01), Schott
patent: 4151477 (1979-04-01), Yokoyama
Iwao Iwamoto, "MFR Component Amplifier SA-30", Toshiba Review, Jan.-Feb. 1970, pp. 55-58.
D. Bohn, Audio Handbook, Published by National Semiconductor Corporation, 1976, pp. 2-45.
P. Baxandall, "Negative Feedback Tone Control", Wireless World, Oct. 1952, pp. 402-405.

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