Signal processing device

Abstract

A signal processor for enhancing the offset accuracy of a video signal without increasing the number of bits of the circuit. An N-bit adder (103) adds a video signal (S101) and an offset value, i.e. the upper N bits of a brightness control signal (S102). A 1-bit pulse generator (107) generates a 1-bit pulse signal (S107) where 1 and 0 appear randomly with the same probability. A selector (106) selects the 1-bit pulse signal (S107) when the LSB of the brightness control signal (S102) is 1 and selects 0 of ground level when the LSB is 0. The selected signal is fed to the carry input of the N-bit adder (103).

Description

technical field [0001] The present invention relates to a signal processing device, and more particularly to a signal processing device for adjusting brightness of a video signal. Background technique [0002] The luminance adjustment of a video signal of a television receiver or the like is performed by adding and subtracting an offset signal to the video signal. [0003] Figure 7 It is a block diagram showing the configuration of a conventional signal processing device. [0004] exist Figure 7 Among them, the structure of the existing signal processing device includes an N-bit adder 1003 and a limiter 1004 . [0005] The N-bit adder 1003 adds the N-bit video signal S1001 input to the video signal input terminal 1001 and the N-bit brightness control signal S1002 input to the brightness control signal input terminal 1002, and uses the addition result as the N-bit signal S1003 from Output 100 3D output. Also, when an overflow occurs, the overflowed 1 bit, that is, the mo...

AI Technical Summary

Problems solved by technology

[0013] However, if the number of bits is increased, not only the N-bit adder and limiter, but also the number of bits in the circuit that processes the offset-adjusted signal must also increase, and there is a problem of increasing the circuit scale.

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