Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1986-04-11
1987-12-15
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358148, 370106, 375114, 371 47, H04N 506
Patent
active
047136928
ABSTRACT:
Serial data from a C-MAC, D-MAC or D2-MAC television signal is applied over line (1) to a serial data to error conversion unit (2) which produces a 3-bit error signal when the applied data is compared with a W1 sync. word. The error signal is applied to comparators (6 and 7) whose other inputs receive a maximum or minimum error dependent signal to produce an output when the number of errors lies within certain requirements. These outputs are latched in a 2-bit latch (8) to produce line pulses on receipt of an acceptable sync. word at an appropriate time, the outputs of the latch (8) being applied to two shift registers (9 and 10). The shift registers (9 and 10) produce outputs P1, P2, P3, P4 over four line periods with the P3, P4 outputs of shift register (10) and the P1, P2 outputs of shift register (9) being applied to respective inputs of a first AND-gate (11) while the remaining outputs are applied to respective inputs of a second AND-gate (12) which gates produce an output when there is coincidence alternately at the end of each frame period. The outputs are applied to respective inputs of an OR-gate (13) to derive a frame flywheel and sync. acquisition unit (14) at frame frequency.
REFERENCES:
patent: 4213011 (1980-07-01), Hoelzl et al.
patent: 4344180 (1982-08-01), Cummiskey
patent: 4414676 (1983-11-01), Kraul et al.
patent: 4587521 (1986-05-01), Ohta et al.
"Methods of Conveying C-MAC/Packet Signals in Small and Large Community Antenna and Cable Networks Installations"; European Broadcasting Union Technical Centre; SPB 352, revised version; Feb. 1985.
"Television Standards for the Broadcasting Satellite Service Specification of the C-MAC/Packet System"; European Broadcasting Union Technical Centre; SPB 284, 4th revised version; Feb. 1985.
Briody Thomas A.
Gadson Gregory P.
Groody James J.
Parker Michael D.
Streeter William J.
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