Wave-filtering device with an adjustable frequency bandwidth

Details Wave-filtering device with an adjustable frequency bandwidth Wave-filtering device with an adjustable frequency bandwidth

2008-07-15

2008-07-15

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Noise or distortion suppression

Spectral adjustment

C381S094100, C381S098000, C250S2140RC

Reexamination Certificate

active

10265442

ABSTRACT:
The present invention relates to a wave-filtering device with an adjustable frequency bandwidth installed in an output unit of an integrated system. The wave-filtering device is used for receiving a first output signal comprising an alternating current signal and a direct current bias voltage, and comprises a direct current bias voltage detector for receiving the first output signal and obtaining a control voltage according to the direct current bias voltage. A low-pass wave filter is electrically connected to the direct current bias voltage detector and receives the control voltage so as to adjust the frequency bandwidth. The low-pass wave filter is used for receiving the first output signal and obtaining a second output signal to be the output of the wave-filtering device with adjustable frequency bandwidth. The low-pass wave filter comprises a variable resistance the value of which varies in accordance with the value of the control voltage.

REFERENCES:
patent: 4563651 (1986-01-01), Ohta et al.
patent: 4609878 (1986-09-01), Rodgers
patent: 5050217 (1991-09-01), Orban
patent: 5510752 (1996-04-01), Gagon
patent: 5559340 (1996-09-01), Nakamura et al.
patent: 6055318 (2000-04-01), Whitecar

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