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Sampling frequency offset compensation device and method

A sampling frequency deviation and compensation device technology, applied in the field of communication, can solve problems such as sampling frequency deviation, sound or music distortion, and user experience deterioration

Active Publication Date: 2016-07-20
LEADCORE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, due to the temperature drift of the crystal oscillator that generates the sampling frequency and the influence of noise, the sampling frequency often has some frequency deviation
If the sampling frequency deviation is too large, the sound or music output by the FM receiver may be distorted, resulting in deterioration of user experience
However, traditional FM receivers cannot completely eliminate sampling frequency deviations, resulting in poor experience for users listening to stereo FM broadcasts

Method used

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  • Sampling frequency offset compensation device and method
  • Sampling frequency offset compensation device and method

Examples

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no. 1 example

[0032] see figure 2 , the sampling frequency offset compensation device includes: a phase locked loop 21 , a sampling frequency offset estimation module 22 and a sampling frequency offset compensation module 23 .

[0033] The transmitted signal of the stereo FM broadcast, that is, the signal received by the stereo FM broadcast receiver is an analog signal. However, in order to be able to process the transmitted signal of the stereo FM broadcast using a common digital platform and demodulate a high-quality stereo audio signal from the transmitted signal, high-frequency sampling is used in the radio frequency front end of the stereo broadcast receiver Signal samples the received signal. After sampling the received signal, the received signal is processed in the discrete time domain.

[0034] However, due to interference, noise and other factors, the sampling signal for sampling the received signal often has a frequency offset, resulting in inaccurate sampling results for the ...

no. 2 example

[0046] This embodiment provides a technical solution of a sampling frequency offset compensation device on the basis of the foregoing embodiments. In addition to the phase-locked loop 33 , the sampling frequency offset estimation module 35 and the sampling frequency offset compensation module 36 , the technical solution includes: a time domain to frequency domain conversion module 31 , a bandpass filter 32 and a sample synchronization module 34 .

[0047] see image 3 , The sampling frequency offset compensation device includes: a time-domain to frequency-domain conversion module 31 , a bandpass filter 32 , a phase-locked loop 33 , a sample synchronization module 34 , a sampling frequency offset estimation module 35 and a sampling frequency offset compensation module 36 .

[0048] The time domain to frequency domain module 31 is used to convert the input time domain signal into a frequency domain signal.

[0049] The time-domain to frequency-domain conversion module 31 is used ...

no. 3 example

[0069] This embodiment provides a technical solution of a phase-locked loop on the basis of the above-mentioned embodiments. device 66.

[0070] see Figure 6 , the multiplier 61 is used to multiply the obtained pilot signal by the same-frequency reference signal.

[0071] The reference signal having the same frequency as the pilot signal has a phase difference of π / 2 from the pilot signal. If the pilot signal is a 19kHz sine signal, the reference signal is a 19kHz cosine signal. The relationship between the multiplication of the pilot signal and the reference signal is given by formula (2):

[0072] θ ( kT ) = sin ( ωkT + α ) · cos ( ωkT + β ) = 1 2 [ sin ...

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Abstract

The embodiment of the invention discloses a sampling frequency offset compensation device and method. The sampling frequency offset compensation device comprises a phase-locked loop which is used for generating frequency offset estimation reference signals according to pilot signals obtained from time domain signals; a sampling frequency offset estimation module which is used for estimating the sampling frequency offset signals of the time domain signals according to the frequency offset estimation reference signals; and a sampling frequency offset compensation module which is used for carrying out sampling frequency offset compensation to the time domain signals according to the sampling frequency offset estimated by the sampling frequency offset estimation module. According to the sampling frequency offset compensation device and method provided by the embodiment of the invention, the sampling frequency offset of stereo frequency modulation broadcast signals can be compensated accurately.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a sampling frequency offset compensation device and method. Background technique [0002] Despite the increasing usage of digital system wireless receivers, Frequency Modulation (FM) receivers are still popular and are increasingly found in cell phones and other electronic handheld devices. Among the many FM receivers, the stereo FM broadcast receiver is the most common FM receiver. [0003] For monophonic FM broadcasting, the transmitted signal only occupies the frequency band from 30Hz to 15KHz, and monophonic broadcasting signals that do not distinguish between left and right channels are transmitted in this frequency band. see figure 1 , in the frequency band from 30 Hz to 15 KHz, the signal transmitted by the stereo FM broadcast is the sum signal 11 of the left channel signal and the right channel signal. Therefore, if a mono receiver is used to receive a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 宋挥师雷海燕仲智刚昆仑
Owner LEADCORE TECH
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