| 单词 |
compand |
| 释义 |
compand, v. Telecommunications and Electronics.|kɒmˈpænd|
[Back-formation from *compander n.]
trans. To subject (a signal) to the action of a compander, usu. in order to reduce the dynamic range and noise.
1951[implied in *companding vbl. n. below]. 1969Bell Syst. Techn. Jrnl. XLVIII. 1459 We compand a one-bit coder by increasing its step size when a string of equal bits is detected in the transmitted code. 1988Internat. Broadcasting XI. 16/2 The largest sample in the block then determines the amount by which the block will be companded.
So companded ppl. a., companding vbl. n.
1951Bell Syst. Techn. Jrnl. XXX. 719 The general principles used in determining the noise advantage of instantaneous companding..may be applied with equal convenience to other systems. 1962Ibid. XLI. 215 As the companded coder system comprises the major portion of the PCM system, only over-all system measurements were taken. 1982IEEE Trans. Communications XXX. 1774/2 The companded two-loop coder is better than the flat spectrum coder. 1989Sound Choice Autumn 25/3 High frequencies are boosted within the tape recorder as part of the pre-emphasis/de-emphasis network designed to reduce noise without the use of companding techniques. |
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