Non-linear digital emphasis circuit

Details Non-linear digital emphasis circuit Non-linear digital emphasis circuit

1984-10-25

1987-05-26

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 37, 358315, 364718, 333 14, H04N 514

Patent

active

046689885

ABSTRACT:
A non-linear digital emphasis circuit for non-linearly emphasizing a high frequency component of an input digital video signal in accordance with an amplitude of the digital video signal. This emphasis circuit comprises: a digital filter for emphasizing the high frequency component of the digital video signal; and a memory in which a data conversion table to non-linearly compress the amplitude of the digital video signal is written and to which the digital video signal is supplied as an address input. The respective polarities of the address input of the memory and of the readout output therefrom are inverted by a polarity inverter in accordance with the polarity of the digital video signal. With this emphasis circuit, an error of the frequency characteristic and time and temperature changes thereof are not caused and no adjustment of the characteristic is needed. Also, this circuit can be formed as an integrated circuit by utilizing only digital circuits.

REFERENCES:
patent: 4193084 (1980-03-01), Yamagirva et al.
patent: 4451746 (1984-05-01), Hirose et al.
patent: 4570193 (1986-02-01), Yamashita

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