Apparatus including an improved device for recovering the d.c. c

Details Apparatus including an improved device for recovering the d.c. c Apparatus including an improved device for recovering the d.c. c

1989-11-03

1991-07-30

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358171, H04N 972

Patent

active

050363883

ABSTRACT:
The apparatus performs a processing operation on the signal in a transmission system, this signal conveying analog luminance and chrominance information components associated with periods of the coded digital signal. A receiver in a MAC television system is, for example, such a device. The device for recovering the d.c. component includes encoding member (4) which, from the decoded digital signal, realizes an encoding operation of the type used for the creation of the received signal, an estimation circuit for the d.c. component (6) calculating the estimation from the difference between the received coded signal and the recovered coded signal by the encoding member, this estimation constituting d.c. component correction signal, and a subtraction circuit (9) which, from the digital signal received, subtracts the d.c. component correction signal throughout the duration of a line. The apparatus also includes, downstream of the device (6) which supplies the d.c. component correction signal, a filter (8) which utilizes d.c. component correction signals of several line scanning periods simultaneously to improve the d.c. component correction signal, which is of the finite-impulse-response type, for example a mean-value taking circuit, and the received signal is delayed (10) for compensating for delay caused by the filter, before being conveyed to the subtraction circuit (9).

REFERENCES:
patent: 4707730 (1987-11-01), Alard
patent: 4713694 (1987-12-01), Zwoin
Principles of communication systems, 2nd ed., Taube Schilling; pp. 298-301, 1986.

Affiliated with

Also associated with

Rating

Apparatus including an improved device for recovering the d.c. c does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus including an improved device for recovering the d.c. c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus including an improved device for recovering the d.c. c will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1546089