US 6,275,554 B1 · Digital symbol timing recovery network

Abstract

A receiver for processing a VSB modulated signal containing terrestrial broadcast high definition television information includes an input analog-to-digital converter (19) for producing a digital datastream. A symbol timing recovery and segment sync recovery network (24; FIG. 3, 4) develops a properly timed sampling clock for the digital converter (19). The symbol timing recovery network (310) responds to an output from the segment sync recovery network (328), which in turn responds to an equalized signal from an adaptive channel equalizer (34). A controlled oscillator (336) generates the sampling clock for the digital converter. A control network (340, 344, 348; FIG. 3) shifts the frequency range of the oscillator to maintain desired linear operation to enhance symbol timing acquisition.

Claims3

Dependent claims

In a system for processing a received datastream containing an image representative signal, apparatus comprising:

a symbol timing recovery network responsive to said received signal prior to equalization, and to a recovered sync component of said received signal for producing a symbol sampling signal;
a channel equalizer responsive to said received signal for producing an equalized signal;
and
a sync recovery network responsive to said equalized signal for producing said recovered sync component, wherein
said received signal comprises a Vestigial Sideband (VSB) modulated signal containing high definition video data represented by a symbol constellation, said data having a data frame format constituted by a succession of data frames comprising a field sync component prefacing a plurality of data segments having an associated segment sync component;
and
said recovered sync component is said segment sync component.

4 more elements

Dependencies are inferred from the claim text.

Digital symbol timing recovery network

Life of this patent

Digital symbol timing recovery network

Life of this patent

Abstract

Claims3