Deghosting apparatus using pseudorandom sequences

Details Deghosting apparatus using pseudorandom sequences Deghosting apparatus using pseudorandom sequences

H - Electricity

04

N

H04N 5/21 (2006.01)

Patent

CA 2103925

2103925 9200646 PCTABS00010 Deghosting apparatus for eliminating multipath signal components in a received transmitted television signal incorporates a training signal which is a finite duration sequence of repetitions of a 2n-1 pseudorandom sequence. The 2n-1 pseudorandom sequences (12) are mapped into 2r sample intervals at either the transmitter (13) or the receiver (28) to facilitate fast Fourier transform processing. Power spectra of the received and mapped training signal (30) and a stored version (44) of the training signal are deconvolved (36) with the deconvolution coefficients produced in logarithmic form. The logarithms (32, 34) are inverse Fourier transformed (38) to produce (40) delay coefficients related to the time of occurrence of the multipath signals, which coefficients are utilized to program variable delay circuitry in an adaptive filter (42) to cancel the multipath components.

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