H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 1/60 (2006.01) H03G 7/00 (2006.01) H04M 9/00 (2006.01) H04M 3/40 (2006.01)
Patent
CA 2110031
A digital sound level control apparatus for adjusting the reception sound level from all telephone circuits to a substantially fixed level comprises a region discrimination circuit for discriminating PCM data input from a PCM conversion section, the data having a segment code for compressing and decompressing a digital audio signal, including an intrinsic variation signal, abasic normalization level signal, and a coding threshold value; a multiplicationcircuit for outputting an input level signal of 12 bits, an addition circuit; a register for holding a pad multiplication value corresponding to a reception circuit; another multiplication circuit for multiplying the input level signal by the pad multiplication value to output an output level signal for outputting sound of a predetermined sound level; and a comparison region discrimination circuit, a subtraction circuit, a division circuit, and a register for regenerating an 8-bit digital signal from the output level signal.
Corporation Nec
G. Ronald Bell & Associates
Honda Toshio
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