| 摘要 |
<p>A digital sound level control apparatus for ad justing the reception sound level from all telephone circuits to a substantially fixed level comprises region discrimination circuit 33 for discriminating PCM input data signal DI from a PCM conversion section, including a segment coder for compressing and decompressing a digital audio signal, among intrinsic variation signal A1, basic normalization level signal A2 and coding threshold value A3, multiplication circuit 34 for outputting input level signal LI of 12 bits, addition circuit 35, register 32 holding pad multiplication value Pd corresponding to a reception circuit, another multiplication circuit 36 for multiplying input level value LI by pad multiplication value Pd to output output level signal LO for outputting sound by a predetermined sound level, and comparison region discrimination circuit 37, subtraction circuit 38, division circuit 39 and register 40 for regenerating an 8-bit digital signal from output level signal LO. A method of providing digital sound level control is also disclosed. <IMAGE></p> |
