Variable gain encoder apparatus and method

Details Variable gain encoder apparatus and method Variable gain encoder apparatus and method

H - Electricity

03

M

354/70

H03M 1/18 (2006.01) H03M 1/00 (2006.01)

Patent

CA 1271996

ABSTRACT A variable gain analog to digital compression encoder apparatus and method is operational for 'on the fly' gain adjustments without introducing significant distortion or noise in telephone conversation. An incoming analog signal is fixed gain reproduced as a first stabilized mid-operating point analog signal. A second stabilized mid-operating point analog signal is produced in inverse proportion to the first stabilized mid- operating point analog signal, in response to a signal tapped along a signal division of a difference between the first and second signals. The second signal is compression encoded at a predetermined rate to produce pulse code modulated signal samples. The tap may be varied to change the encoding gain, at any time, in accordance with operating requirements of a telephone apparatus.

561003

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