Patent ID: 7957490

Claim:
A receiver for usefully receiving the a vestigial-sideband amplitude-modulation signal manifested in electromagnetic field variations wherein the modulating signal is an digital signal formed in accordance with values selected from an eight-value symbol alphabet and superposed on a pedestal, said digital signal being composed of successive frames each composed of two respective fields of symbols of said digital signal, each said field being composed of a respective initial segment of 832 symbols succeeded by respective 312 consecutive further segments of 832 symbols apiece, the four initial symbols of each of said segments of 832 symbols being a prescribed data segment synchronizing signal sequence, the final 828 symbols of said 312 further segments of each said field of digital symbols being such as result from the interleaving of bytes of (207, 187) Reed-Solomon codewords followed by prescribed 2/3 trellis coding, at least some of said fields of digital symbols including a respective succession of at least 832 symbols with respective fixed values designed for utilization as an echo-cancellation reference (ECR) signal, the symbols in each succession of symbols designed for utilization as an ECR signal being preceded by twenty-four consecutive symbols of a respective transitional code and thereafter approximating a repetitive-PN1023 sequence using only two levels of said modulating signal, said receiver comprising: apparatus connected for reproducing said modulating signal in response to said vestigial-sideband amplitude-modulation signal and supplying a reproduced modulating signal in digital form; pedestal-suppression circuitry connected to receive said reproduced modulating signal and to supply a substantially pedestal-free response to said reproduced modulating signal; a PN1023 match filter connected for responding to said substantially pedestal-free response of said pedestal-suppression circuitry to supply measurements of channel impulse response in the time domain during the periods that said ECR signals are reproduced within said reproduced modulating signal; and adaptive filtering circuitry connected for adjustment of a kernel thereof responsive to computations based on said measurements of channel impulse response supplied during the periods that said ECR signals are reproduced within said reproduced modulating signal, said adaptive filtering circuitry further connected for generating equalized reproduced modulating signal responsive to said reproduced modulating signal.