Construct · 1 fields · 1 citations

companding: a standalone construct

One name. One construct. A landmark on the map.

● anchor · a single construct in signal processing Nearest construct by meaning·not indexed
companding1 CONSTRUCTCompandingSMITH · COMPRESS + EXPAND

A single standalone construct; nearby constructs are located against it in the Collider. Tap a field for its definition, unit, and measures.

Signal processing

Compress the dynamic range before, expand it after

Companding (a blend of compressing and expanding) is a technique that squeezes a signal's dynamic range before transmission or quantization and restores it afterward, so that quiet passages get relatively finer treatment and loud ones are kept in bounds, improving the effective signal-to-noise ratio for a given number of bits or channel capacity. Smith's 1957 Instantaneous companding of quantized signals gave the theory behind the logarithmic laws (later standardised as mu-law and A-law) used in digital telephony. The referent is the paired nonlinear compression-then-expansion of amplitude, a standard tool in voice coding and audio.[1]

Unit
The nonlinear amplitude mapping applied before and inverted after a channel
Recovery means
Not applicable
Measured by
Characterised by the companding law (mu-law or A-law), the resulting quantization signal-to-noise ratio, and dynamic-range improvement

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Nearby constructs

amplitude4 fields · 4 citationsjingle · one word, four constructscapacity5 fields · 8 citationsjingle · one word, four limitschannel4 fields · 4 citationsjingle · one word, four constructs

References

  1. Smith, B. (1957). Instantaneous companding of quantized signals. The Bell System Technical Journal, 36(3), 653–709. https://doi.org/10.1002/j.1538-7305.1957.tb03858.x

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