A Howling Suppression Method
An amplitude control and wave limiter technology, applied in the field of communication, can solve the problems of no howling suppression, low efficiency of howling suppression schemes, affecting the overall performance of howling suppression, and user voice perception experience, so as to improve the overall performance.
Active Publication Date: 2020-02-11
CHENGDU TD TECH LTD
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Problems solved by technology
[0003] At present, industry terminals do not have a solution specifically for howling suppression, only partial suppression of howling can be achieved during other signal processing such as noise reduction, but this suppression is not solely for howling, and the suppression is not complete
It can be seen that the current howling suppression solutions for industry terminals are still immature and belong to the exploratory stage. A large number of howling suppression solutions have problems of low efficiency and incomplete suppression, which seriously affect the overall performance of howling suppression and the user's voice perception experience
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[0030] In order to make the purpose, technical means and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.
[0031] figure 1 It is a schematic flow chart of the howling suppression method in this application. like figure 1 As shown, the method includes:
[0032] Step 101, generate a wave limiter according to the detected howling point, and determine the time-domain impulse response h(n) of the wave limiter.
[0033] This application does not involve the specific detection method of the howling point, and only performs howling suppression based on the detection result. figure 2 A schematic diagram of the frequency domain when howling occurs is given. like figure 2 As shown, there may be multiple howling points at the same time. In order to better suppress the howling, it is necessary to design an adaptive wave limiter for multiple howling points. This step is th...
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The application discloses a howling suppression method comprising the following steps: generating a notch filter according to a detected howling point, and determining the time-domain impulse response h(n) of the notch filter, wherein the notch filter is used for filtering signals on the frequency to which the howling point belongs; and using the notch filter to suppress the howling of a received signal s(i), wherein n=0, 1,..., N, i is the sampling index value of the received signal, and N is the number of taps of the notch filter. By using the howling suppression method, howling can be suppressed specially, and the overall performance of howling suppression can be improved.
Description
technical field [0001] The present application relates to communication technology, in particular to a howling suppression method. Background technique [0002] The voice service forms of industry terminals are mainly trunking, DMO and other services, and these services mainly use the external speaker mode. Since most industry terminals work outdoors or in factories with high background noise, the volume is required to be loud, so the uplink and downlink volume of the terminal The gain is usually adjusted to a higher value. After the sound is amplified by the loop gain, the energy accumulates continuously to form howling, which seriously affects the normal use of voice services and causes great discomfort to customers. Therefore, suppressing howling scenes is of great significance Great significance. [0003] At present, there is no solution specifically for howling suppression in industry terminals, and only partial suppression of howling can be achieved during other signa...
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IPC IPC(8): H04R3/00
Inventor 徐绍君王亮鲜柯
Owner CHENGDU TD TECH LTD