.mu.-law to floating point converter

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

H - Electricity

03

K

354/67

H03K 13/24 (1980.01)

Patent

CA 1127307

12 µ-LAW TO FLOATING POINT CONVERTER Abstract of the Disclosure In PCM, systems, it is known to convert µ-law digital code words including a sign bit, m characteristic bits, and n mantissa 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 2m+n locations or (2) employing a µ-law to fixed point conversion followed by fixed point to floating point conversion. To mitigate such drawbacks, the present converter (100) employs a relatively inexpen- sive translator (200) for translating the segment value and a prefixed quantizing step into a reference martissa. 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 2m locations or by simple combinatorial logic.

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