Frequency compander for a telephone line

Details Frequency compander for a telephone line Frequency compander for a telephone line

2006-07-18

2006-07-18

{hacek over (S)}mits, Talivaldis Ivars (Department: 2654)

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

C704S205000, C704S208000

Reexamination Certificate

active

07080017

ABSTRACT:
A frequency compander for improving the frequency response of a telephone line when used for remote broadcasting. The inventive device comprises an encoder for compressing the frequency spectrum of an audio signal and a decoder for expanding the signal back to its original spectrum. Preferably the encoder comprises: an anti-aliasing filter; an A/D converter for digitizing incoming audio; a DSP for compressing the audio; and a D/A converter for outputting compressed audio to the phone line. The decoder comprises: an anti-aliasing filter; an A/D converter for digitizing the incoming compressed signal; a DSP for restoring the original audio; and a D/A converter for outputting program audio. In a preferred embodiment, encoding and decoding are performed in the frequency domain. In another preferred embodiment, encoding and decoding are performed in the time domain using trigonometric transformations.

REFERENCES:
patent: 4755994 (1988-07-01), Staples et al.
patent: 5367539 (1994-11-01), Copley
patent: 5388185 (1995-02-01), Terry et al.
patent: 5539452 (1996-07-01), Bush et al.
patent: 5872531 (1999-02-01), Johnson et al.
patent: 6556965 (2003-04-01), Borland et al.

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