Peter J Wagner

US Patent:

45787190, Mar 25, 1986

Filed:

Dec 6, 1984

Appl. No.:

6/679035

Inventors:

Jurgen Heitmann - Alsbach-Hahnlein, DE
Rolf Loos - Eppertshausen, DE
Peter Wagner - Newark NJ

Assignee:

Robert Bosch GmbH - Stuttgart

International Classification:

G11B 2736
G11B 2110

US Classification:

360 31

Abstract:

A conventional multiple recognition unit provides a multiple error signal whenever digitally coded television signals supplied in successive data blocks to the error recognition unit finds by reference to check-words that the error correction capabilities of the unit are exceeded in any data block. In order to determine when such multiple errors are related to faulty tracking, the multiple error signals are prolonged in duration, overlaps between the multiple error signal and a preceding prolonged signal are detected, and the latter are then integrated. The level of the integrated signal determines the likelihood or presence of tracking error.

US Patent:

48254401, Apr 25, 1989

Filed:

Apr 30, 1987

Appl. No.:

7/045692

Inventors:

Jurgen Heitmann - Alsbach-Hahnlein, DE
Peter Wagner - New York NY

Assignee:

Robert Bosch GmbH - Stuttgart

International Classification:

G06F 1112

US Classification:

371 31

Abstract:

Two logic circuits (4A, 4B) are utilized in alternation for controlling the processing of successive pixels that are detected to be erroneous. Each logic circuit has its own counter 5A and 5B for associating the undisturbed pixels with ordinal numbers designating their spacing from the disturbed pixel under processing and likewise has a separate PROM (6A, 6B) and a separate multiplier for weighting the undisturbed pixel values, as well as an accumulator (10A, 10B) for summing the weighted values to produce a substitute value, so that undisturbed pixels lying between two disturbed pixels can all be used, where necessary, both for compensating for a preceding disturbed pixel and a following disturbed pixel. When a following disturbed pixel is detected while a preceding disturbed pixel is being processed by a logic circuit, that logic circuit provides a special reset to its counter and accumulator and selects another PROM program in accordance with the shortening of the "filter length" by the nearness of the two disturbed pixels. When no defective pixels appear on the counters, multipliers and accumulators do not need to operate.