Signal coder and signal coding method

Abstract

The invention belongs to the signal treatment field, especially relates to a signal coder and signal coding method capable of reducing the circuit cost and circuit scale. The signal coder of the embodiment comprises: a selection unit for alternatively outputting a first chrominance signal and a second chrominance signal according to preset cycle; a modulation unit for alternatively modulating the first chrominance signal by the first subcarrier corresponding with the first chrominance signal according to the preset cycle and modulating the second chrominance signal by the second subcarrier corresponding with the second chrominance signal; a delay unit for delaying the output of the modulated first chrominance signal; a chrominance superposition unit for superposing the delayed first chrominance signal and modulated second chrominance. The signal coder of the embodiment can reduce the number of the unit in the circuit and the volume of the circuit.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a signal encoder and a signal encoding method. Background technique [0002] The full TV signal consists of image brightness information, chrominance information, horizontal synchronous signal, vertical synchronous signal and color burst signal. In order to be compatible with black-and-white TV signals that only contain luminance information, the bandwidth of chrominance signals is compressed by using the insensitivity of human eyes to color changes. The chrominance signal is then modulated into the high frequency part of the frequency band using a subcarrier. By reasonably selecting the frequency of the subcarrier, the luminance information and chrominance information can be placed at intervals on the frequency band, so as to achieve the purpose of multiplexing the frequency band without interfering with each other. [0003] YUV (that is, YCrCb) is a color coding method (belon...

AI Technical Summary

Problems solved by technology

[0016] In the existing signal encoder, since the U signal and the V signal are divided into two paths and processed separately, each signal requires a read-only memory and a modulation multiplier, so the number of units in the circuit of the signal encoder and the circuit size Larger

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