TV bandwidth reduction system using a hybrid discrete cosine DPCM

Patent 4196448 Issued on April 1, 1980. Estimated Expiration Date:

May 15, 1998. 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

3920974

Apparatus for performing a discrete cosine transform of an input signal Patent #: 4152772
Issued on: 05/01/1979
Inventor: Speiser , et al.

Inventors

Application

No. 05/905902 filed on 05/15/1978

US Classes:

348/400.1, Involving hybrid transform and difference coding375/247, Single bit (delta)382/250, Discrete cosine or sine transform708/402Discrete Cosine Transform (i.e., DCT)

Examiners

Primary: Griffin, Robert L.
Assistant: Coles, Edward L.

Attorney, Agent or Firm

International Classes

G06T 9/00 (20060101)
H04N 7/50 (20060101)

Abstract

An image-compression system, wherein the image consists of a planar array of data points having various brightness levels, comprises a transmitter and a receiver. The transmitter comprises an analog-digital converter, for converting input analog data into digital data. The cosine transform is taken of the incoming digital data to transform the data representing various brightness levels into the frequency domain. The various frequency data points are differentially pulse code modulated, thereby removing line-to-line redundancy, the output data being in parallel form. Timing circuitry is provided for controlling the timing of the various circuits. Circuitry is provided in a receiver for the modulating or decoding of the output signal of the transmitter.

Other References

A Habibi, "Hybrid Coding of Pictorial Data" ARPA Quarterly Report, 6-1-70-1-73, pp. 34-75
W. H. Chen et al., "A Fast Computational Algorithm for the Discrete Cosine Transform" 9-77, I.E.E.E. vol. com-25, No. 9 pp. 1004-1009
R. Means, et al. "Television Encoding Using a Hybrid Discrete Cosine Transform and a Differential P.C.M. in Real Time" I.E.E.E., 1974 pp. NTC 74-61-66, Naval Undersea Center S.D. 92, 132
W. F. Schreiber, "Picture Coding" I.E.E.E. vol. 55, No. 3, 3-67 pp. 320-330
D. J. Connor, et al. "Intraframe Coding for Picture Transmission" I.E.E.E., vol. 60, No. 7, Jul. 19 72 pp. 779-791
Habibi et al. "Real Time Image Redundancy Reduction Using Transform Coding Techniques" ARPA Quaterly Tech. Report 10-1-73, 1-8-74
D. D. Buss et al. "Charge Transfer Device Development" ARPA Quarterly Tech. Report, 1-1-75, 12-31-75, pp. 1-64
J. Speiser "High Speed Serial Access Implementation for Discrete Cosine Transforms" ARPA Tech. Report 10-1-73/ 1-8-74