Pulse or digital communications – Repeaters – Testing
Patent
1978-11-15
1981-01-27
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
3401463AQ, 340347DD, 375 42, 364731, H03D 100
Patent
active
042479444
ABSTRACT:
V.29 constellation detection method and apparatus including a quadrant transformer for Processing the quantized real and imaginary component signals corresponding to a particular transmitted signal from a known set of transmitted signals by effectively rotating such components into first quadrant position while at the same time developing a quadrant designating signal or tag; a real part quantizer for determining within which of several real part regions the rotated real part component resides; a boundary line intersect selector for dynamically determining the imaginary part limits correspondence to the real part region selected; an imaginary part quantizer for determining within which of several imaginary part regions the rotated imaginary part component resides; and a constellation point selector which in response to the quantized real part, imaginary part information and quadrant information selects one of 16 constellation points as being the signal most likely received.
REFERENCES:
patent: 3588349 (1971-06-01), Kawai
patent: 3983485 (1976-09-01), Stuart
patent: 3988539 (1976-10-01), Motley et al.
patent: 4037049 (1977-07-01), Lyon
patent: 4047153 (1977-09-01), Thirion
Hamrick Claude A. S.
Ricoh Co. Ltd.
Safourek Benedict V.
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