Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1981-06-01
1983-05-17
Murray, Richard
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358142, H04N 708
Patent
active
043843042
ABSTRACT:
A method of and an apparatus for securely and precisely extracting from a received television signal a start pulse signal which is a binary signal provided at the beginning of an information signal multiplexed in the vertical blanking period of the television signal is disclosed. A PLL circuit acting as a frequency multiplier is provided to obtain a multiplied-frequency signal synchronized with a horizontal synchronizing signal (separated from the television signal by a synchronizing separator circuit) and having a frequency N times equal to or higher than a horizontal synchronizing frequency, first and second extracting gate pulses are formed from the multiplied-frequency signal, the start pulse signal is extracted from the received television signal by the first extracting gate pulse, the extracted start pulse signal is made to pass through a filter resonating with the start pulse signal to remove a noise component, a waveform at a central portion of the filtered start pulse signal is extracted by the second extracting gate pulse, and the extracted waveform is produced as a start pulse for bit synchronization of the information signal.
REFERENCES:
patent: 4202012 (1980-05-01), Hirashima
patent: 4266244 (1981-05-01), Itoh
patent: 4281345 (1981-07-01), Warn
patent: 4303942 (1981-12-01), Fukuda et al.
Ohta Masutomi
Sakai Minoru
Hitachi , Ltd.
Murray Richard
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