Method and apparatus for encoding transmitting and receiving image by pulse code modulation

Patent 4809067 Issued on February 28, 1989. Estimated Expiration Date:

May 26, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Patent #: 4307420
Issued on: 12/22/1981
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Inventor: Furukawa , et al.

Inventors

Application

No. 07/053627 filed on 05/26/1987

US Classes:

375/240.12Predictive

Examiners

Primary: Britton, Howard W.
Assistant: Kostak, Victor R.

Attorney, Agent or Firm

Bernard, Rothwell & Brown

International Classes

G06T 9/00 (20060101)
H04N 7/28 (20060101)
H04N 7/36 (20060101)
H04N 7/26 (20060101)
H04N 7/32 (20060101)
H04N 7/50 (20060101)

Foreign Application Priority Data

1986-05-26 JP

Abstract

An image encoding/transmitting apparatus and method implemented by applying the vector quantization technology utilizing the differential pulse code modulation system in which an estimated error signal is compared with a threshold value to generate a change or movement detection signal and a differential signal, which are then quantized so as to be transmitted and received wherein the polarity of the differential signal is judged by a polarity judgment circuit, a polarity is assigned to the threshold value based on the judgment value by a polarity adding circuit, the differential signal is corrected depending on the threshold value with the polarity, and the corrected differential signal is quantized so as to be transmitted and received.

Other References

Linde et al., "An Algorithm for Vector Quantizer Design", IEEE Transactions on Communications, vol. COM-28, No. 1, Jan. 1980, pp. 84-95
Gersho-"On the Structure of Vector Quantization", IEEE Transactions on Information Theory, vol. IT-28, No. 2, Mar. 1982, pp. 157-166
Buzo et al., "Speech Coding Based Upon Vector Quantization", IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-28, No. 5, Oct. 1980, pp. 562-574