Coded data generation or conversion – Digital code to digital code converters – To or from nonlinear codes
Patent
1991-02-01
1993-05-18
Pellinen, A. D.
Coded data generation or conversion
Digital code to digital code converters
To or from nonlinear codes
375 25, H03M 750
Patent
active
052124819
ABSTRACT:
A circuit for converting a 8-bit .mu.LawPCM code into a 14-bit linear code comprising an inversion circuit receiving a 8-bit .mu.LawPCM code for outputting a 8-bit inverted signal. A 6-bit signal is obtained by putting a bit of "1" at a place lower than the least significant bit of less significant four bits of the 8-bit inverted signal by one bit and another bit of "1" at a place higher than the most significant bit of the less significant four bits of the 8-bit inverted signal by one bit. The 6-bit signal is shifted by a bit shift circuit in the most significant bit direction by the amount which is within a range of 0 bit to 7 bits and which is determined by second to fourth significant bits of the 8-bit inverted signal. The result of shift in the form of 13-bit signal outputted from the bit shift circuit is added with a predetermined number by a constant number addition circuit, and a 14-bit linear code is constituted of a 13-bit output of the addition circuit and the most significant bit of the 8-bit inverted signal added as a sign bit.
REFERENCES:
patent: 4189715 (1980-02-01), Duttweiler
patent: 4467318 (1984-08-01), Zeitraeg
NEC Corporation
Pellinen A. D.
Young B. K.
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