Method and system for reducing noise based on frequency characteristics
A technology of frequency characteristics and noise, applied in the field of data communication, can solve problems such as unclear information transmission, achieve the effect of improving subjective initiative, facilitating data storage and recall, and reducing part of the noise
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Embodiment 1
[0056] Such as figure 1 As shown, this embodiment provides a method for reducing noise based on frequency characteristics, and the method includes the following steps:
[0057] S10: collecting sound signals;
[0058] In this step, the conventional acquisition device is a microphone, and only one is required.
[0059] S20: Filter the sound signal to obtain a filtered signal, and decompose the filtered signal into a sound domain signal;
[0060] In this step, filter technology is used to filter part of the obviously irregular noise, instead of filtering all background noise, to obtain the filtered signal, and then the DSP processing device expands and decomposes the filtered signal into an audio domain signal, the so-called frequency domain, is the signal In terms of frequency characteristics, a coordinate system is used, the abscissa is the frequency, and the ordinate can be the amplitude or the phase; from this coordinate, the relevant part of the signal and frequency can be...
Embodiment 2
[0069] Such as figure 2 As shown, the difference between this embodiment and the previous embodiments is that this embodiment provides a more detailed method for obtaining the frequency domain required by the user, and the step S30 includes:
[0070] S31: judging whether to automatically select the frequency domain required by the user;
[0071] In this step, the system can pre-set the trigger conditions for automatically selecting the frequency domain required by the user, such as displaying the automatic selection and manual selection option interfaces as the trigger conditions, which are determined by the user; The voice environment automatically selects the frequency domain required by the user. If it is the voice recording or sending of the software, the user manually selects the required frequency domain.
[0072] S32: If yes, automatically select the frequency domain required by the user; if not, manually select the required frequency domain by the user.
[0073] In ...
Embodiment 3
[0084] Such as image 3 As shown, the difference between this embodiment and Embodiment 2 is that this embodiment provides a specific method for enhancing the frequency domain signal required by the user and weakening other frequency domain signals, and the step S40 includes the following steps:
[0085] S41: Increase the bandwidth of the audio frequency domain signal required by the user, and compress the bandwidth of other frequency domain signals;
[0086] S42: Compare the sound intensity of the audio frequency domain signal required by the user with the preset sound intensity, and determine whether the sound intensity needs to be adjusted;
[0087] S43: If yes, enhance the sound intensity of the audio frequency domain signal required by the user, and weaken the sound intensity of other frequency domain signals.
[0088] Specifically, assuming that there are three sounds collected in the environment, namely 400Hz, 420Hz and 440Hz, and the volume is about the same, and even...
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