Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-06-03
1983-12-06
Martin, John C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
H04N 502
Patent
active
RE0314609
ABSTRACT:
A method of and apparatus for simultaneously enabling different parts of an input television signal to be made available is used as a television standards converter. Successive lines of an input television signal are cyclically written into n (eg 4) successive random access store sections, using in each cycle the same addresses for the different sections. The write addresses are incremented for successive cycles. The sections are read from using for each section addresses which are related to each other and to the write addresses so as to access a desired set of up to n successive lines. These lines are combined by weighted addition to provide an interpolated output line. The read addresses are derived by counting the desired output lines during each field and multiplying the count by the line conversion ratio. The integral part of the resultant controls the read addresses and the non-integral part controls the weighted addition. A total storage of two fields is used, each divided into sections. Standards conversion to either higher or lower lines rates is possible with improved quality.
REFERENCES:
patent: 3863023 (1975-01-01), Schmersal et al.
patent: 3970776 (1976-07-01), Kinuhata et al.
"Television Standards Converter Using Digital Techniques", The Radio and Electronic Engineer, vol. 43, No. 3, pp. 230-232.
Kuruma et al., "Digital Fields Store Television Standards Converter", International Broadcasting Convention, Sep. 23-27, 1974, pp. 104-113.
Kinuhata et al., "A Digital Standards-Converter for Television Using Intra-Frame Line Interpolation Techniques", IEEE International Conference on Communications, Minneapolis, Jun. 17-19, 1974, pp. 701-705.
Clarke et al. "Developments in Standards Conversion", International Broadcasting Convention, Sep. 25-29, 1978, pp. 202-205, London.
Dalton Christopher J.
Roe Graham D.
British Broadcast Corporation
Martin John C.
O'Connell Robert F.
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