Apparatus for compensating a frequency characteristic of a repro

Details Apparatus for compensating a frequency characteristic of a repro Apparatus for compensating a frequency characteristic of a repro

1997-02-03

1999-03-09

Kuntz, Curtis A.

Electrical audio signal processing systems and devices

Including frequency control

381 61, 381 941, 381 948, 381106, H03G 500

Patent

active

058811575

ABSTRACT:
An apparatus for compensating a frequency characteristic of a reproduction audio signal removes noise from the reproduction signal in the high-frequency region during reproduction of the audio signal, and then emphasizes the noise-removed reproduction signal, thereby improving the frequency characteristic of the reproduction signal. The apparatus includes a high-pass filter for passing only a high-frequency component of the reproduction signal, a clipper for generating a clipped signal by cutting off a signal between predetermined levels from the high-pass filtered reproduction signal, and an adder for superposing the clipped signal on the reproduction signal to emphasize a high-frequency signal. The apparatus improves the frequency characteristic of a signal during reproduction and enhances a signal-to-noise (S/N) ratio by removing a noise component in the high-frequency region of the reproduction signal and controlling the level of the reproduction signal.

REFERENCES:
patent: 3846716 (1974-11-01), Dolby
patent: 4208548 (1980-06-01), Orban
patent: 4894566 (1990-01-01), Rush
patent: 5018205 (1991-05-01), Takagi et al.
patent: 5168526 (1992-12-01), Orban
patent: 5515446 (1996-05-01), Velmer

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