Device for the generation of transfer functions defined by inter

Details Device for the generation of transfer functions defined by inter Device for the generation of transfer functions defined by inter

1995-10-27

1998-09-22

Grant, Chris

Television

Image signal processing circuitry specific to television

Gray scale transformation

348687, 348571, H04N 520

Patent

active

058122184

ABSTRACT:
There is disclosed a device for the generation of transfer functions by segments. One of the device comprises at least two sets of amplifiers having different gains; a comparator for comparing an input signal with at least one reference signal and a switch which is controlled by the output from the comparator, for switching between the at least two sets of amplifiers depending on the status of the comparator output. Where the at least two sets of amplifiers having different gains, at least one gain is greater than 1, and at least one gain is less than 1.

REFERENCES:
patent: 4630553 (1986-12-01), Kimura et al.
patent: 4884141 (1989-11-01), Hyakutake
patent: 5396288 (1995-03-01), Tsugita et al.
Nachrichtechnik Elektronik, 1981, East Germany vol. 31, No. 2, ISSN 0323-4657, pp. 77-81.
Kuhnel C "Principles of logarithmic amplifiers" p. 79, colonne de droite, dernier a linea -- p. 80 colonne de gauche, alinea 2, figures 12, 13.

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