Impulse noise reduction by linear interpolation having a deempha

Details Impulse noise reduction by linear interpolation having a deempha Impulse noise reduction by linear interpolation having a deempha

1984-03-02

1985-07-30

Mullins, James B.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330149, 455223, H03B 104

Patent

active

045324751

ABSTRACT:
An analog audio signal having a high frequency preemphasis 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 sample-hold and deemphasis circuit (5; 50) which deemphasizes the audio signal when impulse noise is nonexistent and holds the signal in the presence of the sampling pulse. A differentiator (6) derives a signal representative of the slope ratio of the analog signal from the deemphasized signal. A sample-and-hold circuit (7) samples the slope ratio signal in response to the sampling pulse and applies it to a charging and discharging circuit (8; 503) which performs linear charging and discharging of the capacitor (55; 505) at a rate variable as a function of the sampled signal to reconstruct the portion of the signal lost during the sampling period.

REFERENCES:
patent: 4305042 (1981-12-01), Tanaka et al.
patent: 4311963 (1982-01-01), Watanabe et al.

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