Digital non-linear pre-emphasis/de-emphasis apparatus for elimin

Details Digital non-linear pre-emphasis/de-emphasis apparatus for elimin Digital non-linear pre-emphasis/de-emphasis apparatus for elimin

1987-11-10

1989-07-18

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358167, 358166, 333 14, 455 72, 307490, 360 65, H04N 576

Patent

active

048498262

ABSTRACT:
A digital non-linear pre-emphasis/de-emphasis apparatus is arranged such that a frequency band of a high-pass filter for extracting a high frequency component signal of an input signal is varied according to the input signal by feeding back the output signal of the high-pass filter through a first non-linear input/output circuit. The first non-linear input/output circuit multiplies the output signal of the high-pass filter by a coefficient which is a function of the output signal of the high-pass filter to obtain a feedback signal. The output signal of the high-pass filter is also applied to a second non-linear input/output circuit which multiplies the output signal of the high-pass filter by a coefficient which is a function of the output signal of the high-pass filter. An output signal of the second non-linear input/output circuit is mixed with the input signal by an operation circuit to obtain an output signal which is non-linearly emphasized or de-emphasized.

REFERENCES:
patent: 4658305 (1987-04-01), Tsushima
patent: 4668988 (1987-05-01), Sasaki et al.
patent: 4730165 (1988-03-01), Nishino et al.
"Digital Signal Processing in Video Tape Recorders", by S. Mehrgardt, IEEE Trans. on Consumer Electronics, vol. CE-31, No. 3, pp. 374-377, issued on Aug. 1985.

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