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Digital microphone

A microphone and digital technology, applied in the direction of sensors, sensor components, transducer circuits, etc., can solve problems such as impure signal sources, achieve good results, increase reflection deflection angles, and achieve good digital signal quality

Inactive Publication Date: 2012-08-29
SHENZHEN HORN AUDIO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the technical solutions of Fest or God Rize all use traditional microphones as transducers, and process analog signals in sound signal acquisition and signal amplification. Some unnecessary noise signals are generated, which itself provides an impure signal source for the digital signal processing part, making the digital microphone itself have the inherent defects of the traditional microphone

Method used

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Experimental program
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specific Embodiment approach 1

[0029] Such as figure 1 The microphone shown includes an acoustic-electric transducer unit 1 , a pulse modulation unit 2 and a digital processing unit 3 . After the external acoustic signal enters the acoustic-electric transducer unit 1, the acoustic signal is converted into an AC signal, and after the AC signal is input into the pulse modulation unit 2, it is converted into a pulse signal with different pulse widths. The larger the amplitude of the AC signal, the wider the converted pulse width.

[0030] Waveform conversion such as figure 2 As shown, by setting the reference voltage +Vref of logic 1 and the reference voltage -Vref of logic 0, along the waveform track of the AC signal, when the amplitude of the AC signal is higher than +Vref but not lower than -Vref, the pulse All are 1; and when the amplitude of the AC signal is lower than -Vref but not higher than +Vref, the pulses are all 0, so that the sound AC signals with different amplitudes are modulated into pulse ...

specific Embodiment approach 2

[0034] Such as Figure 7 The specific embodiment 2 shown differs from the specific embodiment 1 in that the acousto-optic conversion device is a first optocoupler device and a second optocoupler device placed orthogonally, and the first optocoupler device includes a first optocoupler device The transmitting part 51 and the first optocoupler receiving part 52 ; the second optocoupler device includes a second optocoupler transmitting part 71 and a second optocoupler receiving part 72 . The first optocoupler emitting part 51 and the second optocoupler emitting part 71 are placed in such a way that the two transmitted beams are orthogonal, and the first optocoupler receiving part 52 and the second optocoupler receiving part 72 are placed orthogonally so that the two received beams are orthogonal. In this way, the acoustic-electric transducer unit 1 will output two-way electrical signals in phase quadrature, and the pulse modulation unit will convert the two-way electrical signals ...

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Abstract

The invention discloses a data microphone, compared with traditional microphone, which lies in collecting voice signals and switching the voice signals into impulse signals simultaneously, and the data disposal signal is the impulse signal rather than the traditional analog signals. The microphone is composed of an acoustic-electric transduction unit, an impulse modulation unit and a data disposal unit; the acoustic-electric transduction unit collects outside acoustic signal and switches into electric signal, and outputs the disposed data signal. The data microphone of invention can switch the electric signal into the impulse signal through the impulse modulation unit, and controls noise before data disposed; thereby obtaining better signal resource and disposed data with better quality.

Description

technical field [0001] This invention relates to sound transducers, and in particular to a digital microphone for converting sound into digital signals for use in sound processing equipment. Background technique [0002] A microphone is a device that converts a sound analog signal into an output signal representing sound waves. Traditional microphones are analog in design and use of signal processing, for example, relying on piezoelectric or electret or capacitive structures to produce an analog output signal representing pressure waves on the surface of crystals and structures. Taking the electret condenser microphone as an example, the sound wave drives the diaphragm to vibrate, causing the distance between the diaphragm and the plate to change. When the charge on the surface of the electret remains unchanged, this distance change is converted into a change in the voltage between the electrodes. , resulting in an analog signal that is sent to the device for use. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R1/00H04R3/00
Inventor 邢增海
Owner SHENZHEN HORN AUDIO