.mu.-Law to floating point converter

Details .mu.-Law to floating point converter .mu.-Law to floating point converter

1978-10-04

1980-02-19

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 1324

Patent

active

041897153

ABSTRACT:
In PCM systems, it is known to convert .mu.-law digital code words including a sign bit, m characteristic bits, and n mantissa bits representing respectively the polarity, segment value, and quantizing step of a quantized analog sample into a binary floating point representation thereof including a sign, exponent, and mantissa in order to process the digital signal. Known converters are of two relatively expensive types: (1) using a memory having 2.sup.m+n locations or (2) employing a .mu.-law to fixed point conversion followed by fixed point to floating point conversion. To mitigate such drawbacks, the present converter (100) employs a relatively inexpensive translator (200) for translating the segment value and a prefixed quantizing step into a reference mantissa. The code word quantizing step is then added (90, 95) to the reference mantissa to provide the floating point mantissa. The exponent is equal to the segment value; and the sign bit represents the sign. The translator may be implemented, for example, by using a memory having 2.sup.m locations or by simple combinatorial logic.

REFERENCES:
patent: 3825924 (1974-07-01), Montgomery

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