System and method for automatic squelch of human voice signal in digital receiver

Abstract

The invention discloses a system and method for automatically squelching human voice signals in a digital receiver, including a first signal input module, an analog channel module, an ADC analog-to-digital converter module, a DDC down-conversion module, a digital signal processing module and a data output module , the analog channel module is used to amplify, mix and filter the signal received by the first signal input module, filter out the required signal frequency band, and mix it to the frequency point; the ADC analog-to-digital converter module is used to The useful signal frequency band filtered by the analog channel module is used for analog-to-digital conversion; the DDC down-conversion module is used to perform digital down-conversion processing on the digital signal converted by the ADC analog-to-digital converter module; the digital signal processing module is used to complete the correlation of signal data Algorithm processing; data output module, used to output processed data. The beneficial effect of the invention is that the receiver can realize the function of automatically squelching the noise under the condition of no voice, and can effectively improve the listening sense of the monitoring personnel and the voice recognition degree of monitoring.

Description

technical field [0001] The invention relates to the field of squelch control for digital receivers, in particular to a system and method for automatic squelch of human voice signals in a digital receiver. Background technique [0002] In the application field of digital squelch control, due to the influence of digital gain control, the noise signal is amplified after the useful signal disappears, which greatly affects the listener's sense of hearing, so the current receiver stations mostly use level noise suppression To eliminate the impact of noise on the sense of hearing. [0003] Under the control of the level noise suppression system, the operator can actively issue the squelch parameters, and calculate a certain recognition threshold according to the squelch parameters to distinguish useful signals from useless noise signals, thereby eliminating noise signals and only playing them externally Useful signals to achieve the effect of filtering noise. However, the above me...

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Problems solved by technology

[0003] Under the control of the level noise suppression system, the operator can actively issue the squelch parameters, and calculate a certain recognition threshold according to the squelch parameters to distinguish useful signals from useless noise signals, thereby eliminating noise signals and only playing them externally Useful signals to achieve the effect of filtering noise. However, the above method requires the operator to be familiar with the signal environment and understand the operating mechanism of the noise squelch system in order to set the appropriate squelch parameters in a targeted manner. Once the squelch parameters are not set properly, it will be difficult It is easy for the squelch system to filter out the useful signal as noise. At the same time, this method is only applicable to the receiving environment with a single signal environment. Once a high-noise signal and a low-noise signal appear in a complex signal environment at the same time , a single squelch parameter obviously cannot make the equipment achieve the ideal squelch effect

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