Boots – shoes – and leggings
Patent
1978-10-11
1981-01-13
Smith, Jerry
Boots, shoes, and leggings
324 57DE, 364487, 375 57, 375 83, H04B 346, G06F 1531
Patent
active
042453208
ABSTRACT:
A method and device for measuring the slope of the envelope delay characteristic in a transmission channel. The slope is determined from a received measurement signal having a frequency spectrum that includes three rays at frequencies f.sub.o, f.sub.1 and f.sub.2, which are approximately located in the center and at the edges of the useful passband of the channel. At the output of the channel, the three components at frequencies f.sub.o, f.sub.1 and f.sub.2 are extracted from the received measurement signal, and the instantaneous phases .psi.0, .psi.1 and .psi.2 of these three components are measured. The value of the slope S of the envelope delay characteristic is obtained from the relation ##EQU1## where .phi..sub.o ', .phi..sub.1 ' and .phi..sub.2 ' are the phases of the three rays at frequencies f.sub.o, f.sub.1 and f.sub.2 of the measurement signal sent over the channel. When the data transmission system employs double sideband-quadrature carrier (DSB-QC) modulation, the measurement signal is generated by causing the carrier to undergo successive phase changes of +.pi./2 and -.pi./2 radians at the signaling rate. The receiver includes a set of fixed equalizers and the appropriate fixed equalizer is selected as a function of the measured slope.
REFERENCES:
patent: 3629696 (1971-12-01), Bartelink
patent: 3706931 (1972-12-01), Subramanian
patent: 3842247 (1974-10-01), Anderson
patent: 4039769 (1977-08-01), Bradley
International Business Machines - Corporation
Smith Jerry
Woods Gerald R.
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