Apparatus for suppressing background noise in a digital...

Details Apparatus for suppressing background noise in a digital... Apparatus for suppressing background noise in a digital...

H - Electricity

04

J

363/15, 354/69,

H04J 3/02 (2006.01) H03G 7/00 (2006.01) H03M 3/02 (2006.01) H04M 1/253 (2006.01) H04M 9/00 (2006.01)

Patent

CA 1064172

ABSTRACT An apparatus for suppressing background noise in a compounded delta modulated telephone system. The apparatus includes a comparator for comparing a signal related to the analogue input signal to an encoder of the system with a reference signal. The comparator provides an output to reduce the rate of occurence of a succession of bits which cause companding within the encoder when the reference signal exceeds the other signal to the comparator. This is achieved by altering the step size of a feedback signal within the encoder or modifying the output from the encoder by removing or inverting one of the compound bits. The reference signal is higher than a signal generated by background noise and consequently for signals below the reference signal the decoder reconstructs an analogue signal which is lower in level than the input signal. A method for achieving the result is also claimed.

195615

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