Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1984-03-02
1985-07-23
Mullins, James B.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
330149, 455223, H03B 104
Patent
active
045310955
ABSTRACT:
An analog audio signal is applied to a sampling pulse generator (2) which generates a sampling pulse in response to an impulse noise introduced to the signal and also to a first sample-and-hold circuit (5, 6, 7) which tracks the waveform of the audio signal when impulse noise is nonexistent and holds the signal in the capacitor (6) in response to the sampling pulse. A nonlinear transfer circuit (10) is provided to eliminate white noise contained in the analog signal from the first sample-and-hold circuit and feeds its output to a differentiator (11) to derive a signal representative of the slope ratio of the analog signal. A second sample-and-hold circuit (12) samples the slope ratio signal in response to the sampling pulse and applies the sampled signal to a bidirectional constant current source (8) which provides constant current charging and discharging of the capacitor (6) to linearly vary the voltage sampled by the first sample-and-hold circuit (12).
REFERENCES:
patent: 4305042 (1981-12-01), Tanaka et al.
patent: 4311963 (1982-01-01), Watanabe et al.
Hirohashi Kazutoshi
Ishigaki Yukinobu
Mullins James B.
Victor Company of Japan , Limited
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