Audio signal processing device

Details Audio signal processing device Audio signal processing device

1993-12-17

1995-08-22

Coles, Sr., Edward L.

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

H04B 1500

Patent

active

054447879

ABSTRACT:
An audio signal processing device extracts a first series of frequency components from a first input signal with a high signal-to-noise ratio and a second series of frequency components from a second signal with a low signal-to-noise ratio. A middle-amplitude slice of each of the first series is extracted by limiting the amplitude of each to a lower threshold level, subtracting the result from the signal before limiting, and limiting the amplitude of this difference to an upper threshold level. The gain of each middle-amplitude slice is controlled in response to noise from a second input signal. Each result of controlling the gain is added to a corresponding frequency component extracted from the second input signal. Each frequency component of the second input signal is amplitude-limited and the result subtracted from a corresponding result of adding. The results of the latter subtraction are added together to form a composite signal similar to the second, low signal-to-noise ratio signal, with a greatly reduced noise level.

REFERENCES:
patent: 4300019 (1981-11-01), Toyomaki
patent: 4587644 (1986-05-01), Fujiie

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