Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-05-31
1990-11-27
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358197, H04N 5605
Patent
active
049740865
ABSTRACT:
A color television channel that includes a video channel and at least one sound channel is converted by means of a low-IF converter from the RF band directly to the baseband by analog quadrature conversion. The quadrature output signals are digitized. A correcting stage eliminates the quadrature errors and forms a corrected quadrature pair which drives a video stage and a sound conversion stage. The sound conversion stage includes at least one sound channel converter which converts the low-IF sound channel to its baseband by another (digital) quadrature conversion.
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Jack E. Volder, "The CORDIC Trigonometric Computing Technique", IRE Transactions on Electronic Computers, Sep. 1959, pp. 330-334.
Deutsche ITT Industries GmbH
Groody James J.
Peterson Thomas L.
Vu Kim Yen
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