Sound collecting method, device and medium

A device for sound collection, comprising:

• a processor;
• and
• memory configured to store processor-executable instructions,
• wherein the processor is configured to:
• convert time domain signals with a number of M collected by devices for sound collecting with a number of M into original frequency domain signals with a number of M;
• perform beam-forming on the original frequency domain signals with a number of M at each of preset grid points with a number of N, to obtain beam-forming frequency domain signals with a number of N in one-to-one correspondence with the preset grid points with a number of N;
• determine, based on the beam-forming frequency domain signals with a number of N, an average amplitude of frequency components with a number of N corresponding to each of frequency points with a number of K and synthesizing a synthesized frequency domain signal comprising the frequency points with a number of K and having the average amplitude as an amplitude at each of the frequency points with a number of K, wherein a phase of the synthesized frequency domain signal at each of the frequency points with a number of K is a corresponding phase in an original frequency domain signal of a reference device for sound collecting specified from the devices for sound collecting with a number of M;
• and
• convert the synthesized frequency domain signal into a synthesized time domain signal, wherein, M, N, and K are integers greater than or equal to 2;
• wherein any of the devices for sound collecting with a number of M is configurable as the reference device.

A non-transitory computer readable storage medium, when instructions in the storage medium are executed by a processor of a mobile terminal, enables a mobile terminal to perform a method for sound collection, the method comprising:

• converting time domain signals with a number of M collected by devices for sound collecting with a number of M into original frequency domain signals with a number of M;
• performing beam-forming on the original frequency domain signals with a number of M at each of preset grid points with a number of N, to obtain beam-forming frequency domain signals with a number of N in one-to-one correspondence with the preset grid points with a number of N;
• determining, based on the beam-forming frequency domain signals with a number of N, an average amplitude of frequency components with a number of N corresponding to each of frequency points with a number of K and synthesizing a synthesized frequency domain signal comprising the frequency points with a number of K and having the average amplitude as an amplitude at each of the frequency points with a number of K, wherein a phase of the synthesized frequency domain signal at each of the frequency points with a number of K is a corresponding phase in an original frequency domain signal of a reference device for sound collecting specified from the devices for sound collecting with a number of M;
• and converting the synthesized frequency domain signal into a synthesized time domain signal, wherein, M, N, and K are integers greater than or equal to 2;
• wherein any of the devices for sound collecting with a number of M is configurable as the reference device.