Coded data generation or conversion – Analog to or from digital conversion – Nonlinear
Patent
1988-12-29
1991-04-16
Scott, J. R.
Coded data generation or conversion
Analog to or from digital conversion
Nonlinear
341118, 341200, 341155, 341158, 341153, H03M 106, H03M 134, H03M 100, H03M 180
Patent
active
050086723
ABSTRACT:
Signal conversion apparatus transforms an input signal having a value falling in one of a plurality of ranges into an output signal whose value varies for each different range. All of the output signal values corresponding to the plurality of ranges form an ordered set. The output signal values in this set are related to one another such that the value of any output signal is equal to the immediately preceding output signal value multiplied by a predetermined factor which is a constant for at least a plurality of consecutive output signal values. Use of such a relationship between output signal values advantageously reduces quantization errors in certain telecommunications applications and can be embodied within analog-to-digital, digital-to-analog and digital-to-digital signal conversion apparatus.
REFERENCES:
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patent: 3735392 (1973-05-01), Kaneko
patent: 3905028 (1975-09-01), Wintz et al.
patent: 3997892 (1976-12-01), Susset
patent: 4021800 (1977-05-01), Katagiri et al.
patent: 4142185 (1979-02-01), Gordon
AT&T Bell Laboratories
Logan Sharon D.
Padnes David R.
Scott J. R.
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