Digital deemphasis circuit

Details Digital deemphasis circuit Digital deemphasis circuit

1989-05-15

1991-06-11

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

358198, H04N 560

Patent

active

050236091

ABSTRACT:
A digital deemphasis circuit for the BTSC multichannel television standard includes a square-root extractor, a digital filter having the transfer function F(z)=(b-ac)/(z+a), where a, b and c are constants that determine the frequency response of the digital filter. The digital deemphasis circuit further includes a subcircuit that transforms the output signal from the square-root extractor into three quantities w1, w2, w3 that are applied as multiplicands to three multipliers to control the operation of the deemphasis circuit.

REFERENCES:
patent: 4611226 (1986-09-01), Buhse et al.
patent: 4646150 (1987-02-01), Robbins et al.
patent: 4901151 (1990-02-01), Mehrgardt et al.
Leslie B. Tyler, et al., "A Companding System for Multichannel TV Sound," IEEE Transactions on Consumer Electronics, Nov. 1984, pp. 633-640.
Z. Raz, et al., "A Digital Signal Processing Approach to Multichannel Television Sound Decoding", IEEE Transactions on Consumer Electronics, Aug. 1986, pp. 453-461.
J. James Gibson, "Effects on Receiver Design and Transmission Impairments on Audio Signal Quality in the BTSC System for Multichannel Television Sound", J. Audio Eng. Soc., vol. 34, No. 9, Sep. 1986.
G. W. McNally, "Dynamic Range Control of Digital Audio Signals*", Jounral of the Audio Engineering Society, May 1984, pp. 316-327.

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