Method and apparatus for signal processing
A signal processing and sound signal technology, applied in the field of signal processing, can solve problems such as broadband signal distortion, and achieve the effect of improving gain, facilitating fusion, and reducing algorithm complexity
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Embodiment 1
[0046] Reference figure 1 , figure 1 It is a schematic flowchart of the first embodiment of the signal processing method of the present invention.
[0047] In the first embodiment, the signal processing method includes:
[0048] Step 101: Obtain at least two channel sound signals, perform short-time Fourier transform STFT on each channel sound signal, and obtain a frequency domain audio signal corresponding to each channel sound signal;
[0049] Specifically, the sound signals of N microphones are collected (N> = 2), short-time Fourier transform (STFT) is performed on the time domain signal received by each microphone to obtain the data of each frequency point of the signal received by the microphone.
[0050] The same framing method is used to perform short-time Fourier transform on each microphone signal, and the frames are partially overlapped. There can be multiple overlapping methods. This embodiment uses a 1 / 4 frame shift method for framing. Of course Other methods such as 1 / 2 f...
Embodiment 2
[0102] Reference Figure 5 , Figure 5 It is a schematic flowchart of the second embodiment of the signal processing method of the present invention.
[0103] On the basis of the first embodiment, step 105 is further included after step 103:
[0104] Step 105: Multiply the audio signal at each frequency point output after beamforming in the output direction by a gain, where the gain is a value directly proportional to the frequency domain value.
[0105] Specifically, in a broadband beam, it is also necessary to consider the consistency of the beam in the frequency domain, especially the inconsistency of the beam main lobe width at each frequency point. The main lobe of the broadband beam is wide in the low frequency part and narrow in the high frequency part. If the normalization constraint in formula (9) is satisfied at the same time, that is, to ensure that the signal in the desired direction is not distorted, the high frequency energy of the signal will be attenuated greatly , C...
no. 1 example
[0116] In the first embodiment, the device includes:
[0117] The acquisition and time-frequency transformation unit 601 is configured to acquire at least two channel sound signals, and perform a short-time Fourier transform STFT on each channel sound signal to acquire a frequency domain audio signal corresponding to each channel sound signal;
[0118] Specifically, the sound signals of N microphones are collected (N> = 2), short-time Fourier transform (STFT) is performed on the time domain signal received by each microphone to obtain the data of each frequency point of the signal received by the microphone.
[0119] The same framing method is used to perform short-time Fourier transform on each microphone signal, and the frames are partially overlapped. There can be multiple overlapping methods. This embodiment uses a 1 / 4 frame shift method for framing. Of course Other methods such as 1 / 2 frame shift can also be used; the nth microphone frame signal s n (i) Multiply the window funct...
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