OFDM broadcast wave receiver
First Claim
Patent Images
1. An OFDM (Orthogonal Frequency Division Multiplex) broadcast wave receiver comprising:
- tuning means for selectively extracting a signal having a desired frequency as a reception signal from high frequency signals from an antenna;
demodulation means for performing OFDM demodulation on said reception signal to acquire signals each of which has one of a plurality of frequencies;
band detection means for detecting a band width of said reception signal and generating a band detection signal indicative of said band width; and
control means for controlling a demodulation operation of said demodulation means in accordance with said band detection signal,wherein said band detection means discriminates if there is a carrier signal having a predetermined frequency among said plurality of frequencies and outputs the discrimination result as said band detection signal.
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Abstract
An OFDM (Orthogonal Frequency Division Multiplex) broadcast wave receiver for receiving an OFDM broadcast wave, automatically discriminating whether the received signal is of a wide band or a narrow band by determining if a carrier signal having a predetermined frequency is present among signals of a plurality of frequencies, acquired by OFDM demodulation of the reception signal by demodulation means, and controlling the demodulating operation of the demodulation means in accordance with the discrimination result to thereby acquire a demodulated signal.
56 Citations
20 Claims
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1. An OFDM (Orthogonal Frequency Division Multiplex) broadcast wave receiver comprising:
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tuning means for selectively extracting a signal having a desired frequency as a reception signal from high frequency signals from an antenna; demodulation means for performing OFDM demodulation on said reception signal to acquire signals each of which has one of a plurality of frequencies; band detection means for detecting a band width of said reception signal and generating a band detection signal indicative of said band width; and control means for controlling a demodulation operation of said demodulation means in accordance with said band detection signal, wherein said band detection means discriminates if there is a carrier signal having a predetermined frequency among said plurality of frequencies and outputs the discrimination result as said band detection signal. - View Dependent Claims (2, 3, 4)
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5. An OFDM (Orthogonal Frequency Division Multiplex) broadcast wave receiver for receiving a broadcast wave, acquired by performing OFDM modulation on a data signal and transmitted as a signal having a null portion for each frame, said receiver comprising:
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tuning means for selecting a signal having a desired frequency as a reception signal from high frequency signals from an antenna; demodulation means for performing OFDM demodulation on said reception signal to acquire signals each of which has one of a plurality of frequencies; band detection means for detecting a band width of said reception signal and generating a band detection signal indicative of said band width; and control means for controlling a demodulation operation of said demodulation means in accordance with said band detection signal, wherein said band detection means discriminates if a carrier signal having a specific frequency is present in said null portion of said reception signal and outputs the discrimination result as said band detection signal. - View Dependent Claims (6, 7, 8, 9)
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10. An OFDM (Orthogonal Frequency Division Multiplex) broadcast wave receiver for receiving a broadcast wave, acquired by performing OFDM modulation on a data signal and transmitted as a frame-by-frame signal, said receiver comprising:
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tuning means for selecting a signal having a desired frequency as a reception signal from high frequency signals from an antenna; demodulation means for performing OFDM demodulation on said reception signal to acquire signals each of which has one of a plurality of frequencies; band detection means for detecting a band width of said reception signal and generating a band detection signal indicative of said band width; and control means for controlling a demodulation operation of said demodulation means in accordance with said band detection signal, wherein said band detection means discriminates a frame length of said reception signal and outputs the discrimination result as said band detection signal. - View Dependent Claims (11, 12, 13, 14)
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15. An OFDM (Orthogonal Frequency Division Multiplex) broadcast wave receiver for receiving a broadcast wave, acquired by performing OFDM modulation on a data signal and transmitted as a signal having a reference signal for differential demodulation for each frame, said receiver comprising:
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tuning means for selecting a signal having a desired frequency as a reception signal from high frequency signals from an antenna; demodulation means for performing OFDM demodulation on said reception signal to acquire signals each of which has one of a plurality of frequencies; identification parameter detection means for detecting a predetermined identification parameter relating to said broadcast wave and generating an identification detection signal indicative of a content of said predetermined identification parameter; and control means for controlling a demodulation operation of said demodulation means in accordance with said identification detection signal, wherein said identification parameter detection means includes means for extracting a signal corresponding to said reference signal from an output signal of said demodulation means, and discrimination means for discriminating if said extracted signal is a signal indicative of a specific content in said predetermined identification parameter and outputting the discrimination result as said identification detection signal. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification