Device for indicating the received signal quality in a digital television receiver
AssigneePhilips Electronics North America Corporation
InventorsAldo G. Cugnini, David L. Rossmere
Life of this patent
Estimating the term…
Abstract
A device for indicating the quality of a received digital broadcast video signal in a digital television receiver includes circuitry for determining the amount of multipath interference. The device generates a display graph indicative of the signal quality. Optionally, the device may also consider, in determining the signal quality, whether a demodulator in the television receiver is able to lock onto a sync sequence in the video signal, whether an adaptive equalizer also in the television receiver is able to lock onto the sync sequence, and the amount of errors being corrected in an error correction circuit in the television receiver.
Claims8
A device for generating a signal quality indicator (SQI) signal for indicating a signal quality of a received digital broadcast signal for a digital television receiver comprising an antenna for receiving digital broadcast signals, a tuner for selectively tuning to one of said digital broadcast signals, a variable gain amplifier for amplifying the tuned signal to a predetermined level, a demodulator for demodulating the tuned signal, said demodulator having a control output for supplying an automatic gain control (AGC) signal to the variable gain amplifier, an adaptive equalizer, said adaptive equalizer generating weighting coefficients for adapting the processing in the adaptive equalizer, and signal processing circuitry for processing the equalized tuned video signal, wherein the SQI signal generating device comprises:
- means for acquiring the weighting coefficients generated in said adaptive equalizer, wherein said weighting coefficients include a main weighting coefficient and subordinate weighting coefficients;
- means for comparing said subordinate weighting coefficients with said main weighting coefficient;
- and
- means for generating said SQI signal for indicating the quality of said received digital broadcast signal based on said comparison.
A device for generating a signal quality indicator (SQI) signal for indicating the signal quality of a received digital broadcast signal for a digital receiver comprising an antenna for receiving digital broadcast signals, a tuner for selectively tuning to one of said digital broadcast signals, a variable gain amplifier for amplifying the tuned signal to a predetermined level, a demodulator for demodulating the tuned signal, said demodulator having a control output for supplying an automatic gain control (AGC) signal to the variable gain amplifier, an adaptive equalizer, said adaptive equalizer generating weighting coefficients for adapting the processing in the adaptive equalizer, an error detecting/correcting circuit for determining an error rate in the received digital broadcast signal, and signal processing circuitry for processing the equalized tuned signal, wherein the SQI signal generating device comprises:
- first means for determining whether the demodulator is able to lock onto a sync sequence in the received digital broadcast signal;
- second means for determining whether the adaptive equalizer is able to lock onto said sync. sequence;
- means for acquiring the weighting coefficients generated in said adaptive equalizer, wherein said weighting coefficients include a main weighting coefficient and subordinate weighting coefficients;
- means for comparing said subordinate weighting coefficients with said main weighting coefficient;
- and
- means for generating said SQI signal for indicating the quality of said received digital broadcast signal based on said first determining means, said second determining means, said error rate, and said weighting coefficient comparison.
Dependencies are inferred from the claim text.