Apparatus and method for controlling operation of a high defination television adaptive equalizer
First Claim
1. A method for controlling the demodulating section of a modem of a high definition television system, comprising the steps of:
- initializing a plurality of elements of the modem;
acquiring a synchronous clock signal from a received signal by operating a symbol timing recovery loop when an adaptive equalizer and a carrier recovery loop are initialized;
determining a first output error value for equalization of the received signal equalized by the adaptive equalizer when said carrier recovery loop is initialized; and
operating said plurality of elements of said modem and said carrier recovery loop when said first output error value is less than a first preset value.
1 Assignment
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Accused Products
Abstract
An adaptive equalizer for use in a high definition television (HDTV) receiver, which includes a filtering device having a first filter for FIR (Finite Impulse Response) filtering by receiving a real signal and a real coefficient for output from the filtering device, a second filter for FIR filtering by receiving the real signal and an imaginary coefficient, a third filter for FIR filtering by receiving the real coefficient and an imaginary signal, and a fourth filter for FIR filtering by receiving the imaginary signal and the imaginary coefficient. The adaptive equalizer also includes an adding device having a first adder and a second adder, the first adder subtracting the second filter output from the first filter output in the filtering device, and the second adder adding the outputs of the third and fourth filters. Further, the adaptive equalizer includes an equalization coefficient calculation and downloading device for calculating an equalization coefficient according to the outputs of real and imaginary parts from the first and second adders in the adder to thereby provide the real coefficient and the imaginary coefficient.
34 Citations
11 Claims
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1. A method for controlling the demodulating section of a modem of a high definition television system, comprising the steps of:
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initializing a plurality of elements of the modem; acquiring a synchronous clock signal from a received signal by operating a symbol timing recovery loop when an adaptive equalizer and a carrier recovery loop are initialized; determining a first output error value for equalization of the received signal equalized by the adaptive equalizer when said carrier recovery loop is initialized; and operating said plurality of elements of said modem and said carrier recovery loop when said first output error value is less than a first preset value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A modem apparatus of a high definition television comprising:
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tuner for tuning to a received radio frequency signal and output the received radio frequency signal to an IF filter to convert said received radio frequency signal into an intermediate frequency band; demodulator connected to said tuner, for demodulating said converted signal; filter for matching a signal demodulated by said demodulator; symbol timing recovering unit for receiving an output of said filter to thereby generate timing information; an adaptive equalizer for adaptively equalizing said filter output in order to compensate for degradation of said received signal, in response to said timing information of said symbol timing recovering unit; and recovery unit for recovering a carrier of said received signal by receiving an output of said adaptive equalizer. - View Dependent Claims (11)
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Specification