Receiver and method for receiving frequency modulating signal

Abstract

The invention relates to a receiver for receiving a frequency modulating signal, which comprises an antenna, a modulator, an analog-to-digital converter, a demodulating module and a frequency shift estimating module. The antenna is used for receiving a frequency modulating signal; the modulator is coupled to the antenna and is used for converting the frequency modulating signal into an intermediate frequency signal; the analog-to-digital converter is coupled to the modulator and is used for converting the intermediate frequency signal into a digital intermediate frequency signal; the demodulating module is coupled to the analog-to-digital converter and is used for demodulating the digital intermediate frequency signal into an audio signal on the basis of a frequency shift compensating signal; and the frequency shift estimating module is coupled to the demodulating module and is used for generating the frequency shift compensating signal according to the audio signal.

Description

technical field [0001] The present invention relates to a frequency modulation signal receiver and receiving method, and in particular to a frequency modulation signal receiver and receiving method capable of compensating frequency offset. Background technique [0002] Frequency modulation (frequency modulation) technology is widely used in today's communication systems. The transmitter performs frequency modulation on the data to be transmitted according to a specific wireless communication standard to obtain a frequency modulation signal, and the frequency modulation signal is a radio frequency signal. The receiver receives the frequency modulated signal and demodulates the frequency modulated signal to recover the data to be transmitted. [0003] Please refer to figure 1 , which is a block diagram of a conventional frequency modulated signal receiver. The frequency modulation signal receiver 100 includes an antenna 110 , a tuner 120 , an analog-to-digital converter 130...

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Problems solved by technology

However, when the local oscillator frequency LO of the transmitter end is slightly different from the local oscillator frequency LO of the frequency modulated signal receiver 100, it will cause distortion of the audio signal AS, so that the audio signal AS will have a DC offset level ( DCoffset level), which will lead to system degradation (degrade) phenomenon

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