Patent ID: 6320627
Filing Date: 2001-11-20
Classification: H04L,H04N

Abstract:
An apparatus for demodulating digital video broadcast signals comprising data modulated on a multiplicity of spaced carrier frequencies, comprising:a down-conversion circuit configured to convert an input broadcast signal to a frequency sufficiently low to enable analog-to-digital conversion of the signal;an analog-to-digital conversion circuit configured to convert the broadcast signal to a series of digital samples;a real-to-complex conversion circuit configured to convert each digital sample to a complex number value;a Fourier transform circuit configured to analyze the complex number values and provide a series of signal values for each carrier frequency;a frequency control circuit configured to produce a signal for controlling the frequency of the signal formed by said complex number values in response to the output of said Fourier transform circuit; anda signal processing circuit configured to provide an output for decoding in response to the signal values, wherein the signal processing circuit comprises a channel equalization circuit and channel state information generating circuit.