Apparatus and method of multi-sensor sound recording

摘要

An apparatus and a method for sound recording are provided. The apparatus stores an equalizer and includes a housing, a microphone, and a processor. The microphone includes a plurality of sensors and receives a sound signal through an acoustical resonator in the housing. The microphone generates a plurality of electronic signals in response to the sound signal. The equalizer generates a plurality of equalized signals according to the electronic signals. The processor generates an output signal according to the equalized signals. The equalizer compensates the gain margin and the phase margin caused by the sound signal passing through the acoustical resonator in order to prevent the output signal from being affected by resonance of the sound signal in the acoustical resonator.

主权项

1. A sound recording apparatus comprising:
a housing having an acoustical resonator, the acoustical resonator allowing a sound signal to pass therethrough; a microphone disposed in the housing and connected with the acoustical resonator, the microphone comprising a plurality of sensors configured to convert the sound signal into a plurality of electronic signals, wherein the acoustical resonator causes the microphone to generate a frequency response offset, wherein the sensors comprise a first sensor and a second sensor, and wherein the electronic signals comprise a first electronic signal and a second electronic signal; a memory storing an equalizer, the equalizer compensating the frequency response offset, wherein the equalizer comprises a first filter generating a first equalized signal according to the first electronic signal and a second filter generating a second equalized signal according to the second electronic signal; and a processor coupled to the microphone, the processor compensating the electronic signals according to the equalizer to generate compensated electronic signals comprising the first equalized signal and the second equalized signal, and generating an output signal according to the compensated electronic signals,
wherein the processor comprises an energy calculator, a mixer coupled to the energy calculator, and a smoother coupled to the mixer,wherein the energy calculator calculates an energy of the first equalized signal and an energy of the second equalized signal separately,wherein the mixer selects one of the first equalized signal, the second equalized signal, and a linear combination of the first equalized signal and the second equalized signal as a third electronic signal according to the energies of the first equalized signal and the second equalized signal, andwherein the smoother performs a low-pass filtering to the third electronic signal to generate the output signal.