| 摘要 |
<p>A method of transmitting a quiet, or zero, signal in a PCM communication system. The zero signal is specified universally in ordered set terms for either ν-Law or A-Law PCM systems, which has minimal energy in the A-Law system, and contains no energy within the ν-Law system. The signal is preferably specified as a repetition of six intervals (or multiple thereof) because the DTN can modify PCM codes on a six interval period by the robbed-bit signaling mechanism. The zero signal may be used to detect network elements that produce single-signed zero outputs from zero inputs of either sign. In addition, by examination of the zero signal the receiver may determine whether the channel includes an analog link or connection.</p> |
