Dc suppression for pcm modems

Details Dc suppression for pcm modems Dc suppression for pcm modems

H - Electricity

04

M

H04M 11/06 (2006.01) H03K 7/00 (2006.01) H04L 25/49 (2006.01)

Patent

CA 2425421

An improved DC compensation method for use in conjunction with telephony signalling. The method includes defining a frame that includes at least two n-bit codewords. An unsigned codeword is then identified within the frame by applying a rule to the codewords in the defined frame. Next, a sign bit is appended to the unsigned codeword, thereby producing a DC compensating codeword. The sign bit is selected based upon a weighting function of the linear values associated with previously transmitted codewords. The remaining unsigned codewords in the frame are assigned sign bits from user data.

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