Spectrum displaying device for audio device

Details Spectrum displaying device for audio device Spectrum displaying device for audio device

1996-12-11

1999-11-02

Lee, Ping W

Electrical audio signal processing systems and devices

Monitoring of sound

381 58, 324 7631, H04R 2900

Patent

active

059784873

ABSTRACT:
A spectrum display device for audio use includes a first differential amplifier circuit and a first capacitor forming a low pass filter. A second differential amplifier circuit and a second capacitor form high pass filter; A band pass filter circuit is formed by the low pass filter and the high pass filter; A band selection circuit selectively sets a frequency band of the band pass filter circuit out of a plurality of predetermined frequency bands through selective setting of the operating currents of the first and second differential amplifier circuits.

REFERENCES:
patent: 4307340 (1981-12-01), Inami et al.
patent: 5614860 (1997-03-01), Osaki et al.
patent: 5619340 (1997-04-01), Inagaki
Mitchell et al, Introduction to Electronics Design, pp. 524-526, 1988.

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