Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1993-12-21
1995-06-13
Young, Brian K.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
341144, H03M 300
Patent
active
054247390
ABSTRACT:
A device for digitally shaping the quantization noise of an N-bit digital signal, N being a positive integer, comprises: a register for masking out selected bits of the N-bit digital signal to produce an M-bit digital signal, M being a positive integer less than N; a digital noise-shaping coder, coupled to the register, for shaping the quantization noise of the masked out bits; and an accumulator, coupled to the register and the coder, for accumulating the digital signals received from the register and the coder. Likewise, a method of digitally shaping the quantization noise of an N-bit digital signal, N being a positive integer, comprises the steps of: masking selected bits of an N-bit digital signal to produce an M-bit digital signal, M being a positive integer less than N; digitally coding the masked bits of the N-bit digital signal to produce a B-bit digital signal, B being a positive integer less than N-M; and accumulating the M-bit digital signal and the B-bit digital signal.
REFERENCES:
patent: 4467316 (1984-08-01), Musmann
patent: 4593271 (1986-06-01), Candy
patent: 5144308 (1992-09-01), Norsworthy
"A 16-bit 4'th Order Noise-Shaping D/A Converter" by L. Richard Carley and John Kenney, Department of Electrical and Computer Engineering, Reprinted from IEEE Proc. CICC, pp. 21.7.1-21.7.4, 1988, reprint pp. 482-485.
"Oversampled, Linear Predictive and Noise-Shaping Coders of Order N>1", by Stuart K. Tewksbury, Member IEEE, and Robert W. Hallock, pp. 139-149, IEEE Transactions on Circuits and Systems, vol. Cas-25, No. 7, Jul. 1978.
"Philips Oversampling System for Compact Disc Decoding", Wayne Schott, N.A.P. Consumer Electronics, Knoxville, Tenn., pp. 32-35, Audio/Apr. 1984.
Norsworthy Steven R.
Viswanathan Thayamkulangara R.
AT&T Corp.
Skaist Howard A.
Young Brian K.
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