Waveform clipping circuits

Details Waveform clipping circuits Waveform clipping circuits

H - Electricity

04

M

330/37, 379/82

H04M 1/60 (2006.01) H03G 11/00 (2006.01) H04R 25/00 (2006.01)

Patent

CA 1200942

WAVEFORM CLIPPING CIRCUITS Abstract of the Disclosure A soft clipping circuit for a telephone subset limits the output signal amplitude to the line thus preventing output stage saturation with consequent reduction in impedance. The circuit includes a variable gain input stage (I/P), a main speech signal amplifier (AMP1) and a rectifying amplifier feed back stage (AMP2) that generates a control current whenever the output speech signal exceeds a predetermined threshold. This current is fed to the input stage so as to reduce its gain. Typically the input stage comprises a long tailed transistor pair amplifier, the control current being fed to the tail of the pair.

422785

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