Embedding quantization system for vector signals
First Claim
1. In an embedding quantization system of a vector signal comprising:
- an input terminal for receiving a sampled input signal;
a quantizer;
a predictor having an input coupled to the output of said quantizer;
a subtractor for providing the difference between the input signal and the output of said predictor, to said quantizer;
wherein the input signal applied to said input terminal is a vector signal which is subject to quantization;
an adder means for providing a sum of the output of said quantizer and the output of said predictor, to the input of said predictor, wherein a prediction by said predictor and a quantization by said quantizer are input of said predictor, wherein a prediction by said predictor and a quantization by said quantizer are accomplished a plurality of times by feeding back the output of said predictor to the input of said predictor through said adder means to provide a plurality of quantized output signals;
a quantization control means;
a first switch for switching the input of said predictor wherein the input signal is applied to said predictor at a first clock period for the embedding quantization operation, and the output of said adder is applied to the predictor at other clock periods controlled by said quantization control means; and
a second switch, coupled to the output of said quantizer, for providing quantized output signals to an external circuit under the control of said quantization control means.
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Abstract
The DPCM (differential pulse code modulation) for color television signal transmission has been improved both in picture quality and information compression, by a vector signal quantization called embedding quantization. According to the present invention, vector signal comprising a plurality of elements is quantized while the quantized output signal is obtained after a plurality of quantization and prediction operations. Number of repetition times of the quantization and prediction is for instance equal to the number of elements composing vector signal. A vector is for instance composed of three elements relating to red, green, and blue primary signals of a color television signal.
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Citations
7 Claims
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1. In an embedding quantization system of a vector signal comprising:
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an input terminal for receiving a sampled input signal; a quantizer; a predictor having an input coupled to the output of said quantizer; a subtractor for providing the difference between the input signal and the output of said predictor, to said quantizer; wherein the input signal applied to said input terminal is a vector signal which is subject to quantization; an adder means for providing a sum of the output of said quantizer and the output of said predictor, to the input of said predictor, wherein a prediction by said predictor and a quantization by said quantizer are input of said predictor, wherein a prediction by said predictor and a quantization by said quantizer are accomplished a plurality of times by feeding back the output of said predictor to the input of said predictor through said adder means to provide a plurality of quantized output signals; a quantization control means; a first switch for switching the input of said predictor wherein the input signal is applied to said predictor at a first clock period for the embedding quantization operation, and the output of said adder is applied to the predictor at other clock periods controlled by said quantization control means; and a second switch, coupled to the output of said quantizer, for providing quantized output signals to an external circuit under the control of said quantization control means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification