Closed-caption decoder circuit having robust synchronization fea

Details Closed-caption decoder circuit having robust synchronization fea Closed-caption decoder circuit having robust synchronization fea

1994-01-14

1996-04-09

Groody, James J.

Television

Nonpictorial data packet in television format

Sync

348468, 348478, 348563, H04N 708

Patent

active

055066267

ABSTRACT:
A closed-caption decoder which uses separate clock generators to produce the sampling frequencies for the clock run-in signal and the data portion of the closed-caption signal. Each of the clock generators generates its signal from a common 12 MHz reference clock signal. The timing of the sampling clock signal for the closed-caption data is advanced at the start of the sampling interval to reduce the total timing errors in the sampling of the closed-caption data. Additionally, the decoder can adaptively select one of four edges of the clock run-in signal to use as its synchronizing reference. Furthermore, the decoder may be adapted to recognize more than one start byte pattern.

REFERENCES:
patent: 4614971 (1986-09-01), Maney
patent: 4626913 (1986-12-01), Gurumurthy
patent: 5223930 (1993-06-01), Zato
patent: 5343239 (1994-08-01), Lappington
Proprietary Document: CCD 3000/LN21, "One-chip Closed-Caption Decoder," pp. 1-7, 20-25.
Proprietary Document: CCU 3005, Central Control Unit, preliminary, ITT Semiconductors, pp. 1-18, 51-52, Aug. 20, 1992 Edition.
Proprietary Document: "Closed-Caption Decoder" CMOS; Motorola Semiconductor Technical Data; MC144143; Jan. 11, 1991; pp. 1-18.
"Z86128 Line 21 Closed Caption Controller (L21C)"; from ZILOG Prelininary Product Specification; Mar. 1991; 11 pages.
"LSI Chip Set for Closed Caption Decoder System"; by Masami Harigai et al.; from IEEE Transactions on Consumer Electronics, vol. 37, No. 3, Aug. 1991. pp. 449-454.
"Microcontrollers for Closed Caption System"; by Hiroyasu Shindo et al.; from IEEE; vol. 38, No. 3, Aug. 1992; pp. 268-272.
"A Single Chip Line 21 Captioning Decoder"; by N. F. Hurley; from IEEE, vol. 38, No. 3, Aug. 1992; pp. 261-267.
"A Single Chip Solution for Closed Caption Decoding"; by U. Moller et al.; from IEEE; vol. 38 No. 3, Aug. 1992; pp. 274-278.
"Closed Captioning with the Motorola 68HC05CC1"; by Janice Benzel et al.; from The Computer Applications Journal; Issue #34 May 993; pp. 12-16, 18-19, 22-24.

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