A kind of fm voice signal demodulation data audio recovery method and recording method

An audio recovery and data demodulation technology, applied in the transmission system, electrical components, etc., can solve the problems of complex hardware design, lack of clarity, poor scalability, etc., to achieve flexible and easy expansion, simplified structure and processing flow, and reduced hardware cost effect

Active Publication Date: 2019-09-06
SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In digital demodulation, there are currently two main methods. One is to demodulate audio digital signals through special digital IC devices, such as programmable digital frequency converters, but this method requires FPGA or DSP to assist audio signals. Post-processing, poor scalability, and complex hardware design; the other is to directly use FPGA or DSP programmable digital devices to complete the entire digital demodulation process of FM audio signals. This method has good efficiency and flexibility. Balanced performance, but limited by the hardware programming mechanism, the scalability is still poor
Moreover, the current FM voice demodulation method is limited to the demodulation of audio signals, but there is no clear method for how to perform subsequent processing on the demodulated audio signals to restore voice information and persistent records

Method used

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  • A kind of fm voice signal demodulation data audio recovery method and recording method
  • A kind of fm voice signal demodulation data audio recovery method and recording method
  • A kind of fm voice signal demodulation data audio recovery method and recording method

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specific Embodiment 1

[0029] like figure 1 Shown, a kind of FM speech signal demodulation data audio recovery method, adopts the digitized demodulation of software-based FM analog audio broadcasting and the audio frequency recovery, and concrete method step is:

[0030] Step 1: the FM broadcast signal enters in the receiver through the receiving antenna, and through the radio frequency conversion module, the broadcast frequency point f will be set as the radio frequency center, the input radio frequency within the bandwidth range (in this specific embodiment, the bandwidth range B=20MHz) is set The signal is transformed to f 1 (in this specific embodiment f 1 =140MHz) is the centered intermediate frequency signal;

[0031] Step 2: intermediate frequency signal produces digital signal after ADC (analog-to-digital converter) quantization sampling again, and digital signal data is sent in the upper computer PC through USB interface; In this specific embodiment, intermediate frequency signal passes s...

specific Embodiment 2

[0053] Audio data recording method on the basis of specific embodiment 1, concrete method steps are:

[0054] Step 11: the audio recovery data is interpolated (in this specific embodiment, the audio recovery data is twice interpolated), generate the left and right sound channel data, and the sound channel data is saved in the windowsWAVE waveform file format together with the data description information In the text, the voice can be recorded persistently, and can be played back with ordinary music player software.

specific Embodiment 3

[0056] On the basis of specific embodiment 2, the method steps also include:

[0057] Step 12: Push the data description information such as audio recovery data and audio sampling rate to the sound card driver of the personal computer, and the demodulated and recovered audio information can be sent out by the speaker.

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Abstract

The invention provides an FM voice signal demodulation data audio recovery method and a recording method. By adopting a digitalized demodulation, audio recovery and record preservation method of FM analog audio broadcasts based on software, all signal and data processing procedures are completely implemented on personal computers in the form of software without using an FPGA or a DSP as a traditional method, and thus the structure and processing procedures of a digital receiver can be simplified, the hardware cost can be reduced, the software-based implementation can also be more flexible andeasy to expand, the measurement analysis of spectrum parameters can be supported, and the mode that audio data can be persistently saved also brings convenience to the implementation of more subsequent audio processing.

Description

technical field [0001] The invention relates to the field of radio communication, in particular to an audio recovery method and a recording method of FM voice signal demodulation data. Background technique [0002] Since the emergence of FM frequency modulation technology in the middle of last century, it has been widely used in the field of wireless communication due to the advantages of simple modulation method and strong anti-interference ability. The voice signal is modulated and demodulated by this modulation method. [0003] Currently, demodulation methods for FM signals are divided into two categories. One is analog demodulation, which directly demodulates audio information through dedicated analog IC devices or chips, such as the FM signal demodulator CL6017G commonly used in FM radios. This method can quickly demodulate analog voice and audio signals, but Limited by the analog system, it cannot support filtering, analysis, storage and recording of the demodulated ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/00H04B1/16
Inventor 李东洋余洋侯智鹏
Owner SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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