Noise reduction circuit, noise reduction apparatus, and noise re

Details Noise reduction circuit, noise reduction apparatus, and noise re Noise reduction circuit, noise reduction apparatus, and noise re

1996-11-20

1998-08-18

Kuntz, Curtis

Electrical audio signal processing systems and devices

Noise or distortion suppression

381 948, 330149, 330151, H04B 1500

Patent

active

057968500

ABSTRACT:
A mixed signal which contains a noise is inputted. Then, the signal is inverted and amplified by an inverting amplifier which has a high gain, and attenuated by a attenuator in order to generate an inverted phase signal. In a mixer, the inputted signal and the inverted phase signal are added, and outputted. Since the inverted phase component of the noise is added to the noise, the noise in the mixed signal is canceled. For the voice signal, an amplified inverted signal is generated by an invert amplifier. However, an amplitude is restricted due to a high gain. Since the amplitude is restricted, a level of the inverted phase signal is lower than a level of a voice signal. Even if the voice signal and the inverted phase component are added in the mixer, the voice signal is outputted almost thoroughly.

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