Television – Format conversion
Patent
1993-03-10
1994-04-26
Groody, James J.
Television
Format conversion
348725, H04N 546
Patent
active
053071654
ABSTRACT:
A television signal kind discriminating apparatus discriminates an input television signal in a short time between a MUSE signal having a three-value type horizontal synchronizing signal and a popular television signal such as an NTSC signal having a horizontal synchronizing signal consisting only of signals of a single polarity. An input television signal is converted into a binary signal by a level comparator using a level between first and second polarity signal portions of the horizontal synchronizing signal of the MUSE signal, and the binary signal is delayed by a predetermined time by a delay circuit. An exclusive OR signal between the binary signal not delayed and the binary signal delayed is outputted from a gate, and a temporal position of a mid point of the horizontal synchronizing signal of the input television signal is detected by a detector. Whether the input television signal is a MUSE signal or a popular television signal is discriminated based on the exclusive OR signal within the predetermined time after the thus detected temporal position of the mid point of the horizontal synchronizing signal.
REFERENCES:
patent: 4860098 (1989-08-01), Murphy
patent: 5132793 (1992-07-01), Hirahata et al
patent: 5218436 (1993-06-01), Sugiyama et al.
Kawashima Hiroyuki
Okumura Yuji
Eslinger Lewis H.
Groody James J.
Lee Michael H.
Maioli Jay H.
Sony Corporation
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