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Digital-analog hybrid microphone

A digital-analog hybrid, microphone technology, applied in digital weighted sensing elements, transducer circuits, sensors, etc., to solve problems such as inability to output analog signals

Active Publication Date: 2013-11-20
SILICON STAR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The signal output by this microphone is a digital signal and cannot output an analog signal

Method used

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  • Digital-analog hybrid microphone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: a kind of digital-analog hybrid microphone of this embodiment, as figure 1 As shown, it includes a sound sensor 1 and an output port 15, and also includes an analog preamplifier circuit and a digital preamplifier circuit. The analog preamplifier circuit and the digital preamplifier circuit are respectively connected to the sound sensor, and the output ports are respectively connected to the analog preamplifier The amplifying circuit and the digital preamplifying circuit, the analog preamplifying circuit and the digital preamplifying circuit are respectively connected with an automatic switching control circuit which controls the two preamplifying circuits to work or close. The sound sensor is an electret condenser microphone sensor.

[0022] The analog preamplifier circuit includes an operational amplifier 2, a first NMOS tube 3 and a resistor R, one end of the sound sensor 1 is grounded, the other end is connected to the non-inverting input terminal of th...

Embodiment 2

[0030] Embodiment 2: The analog preamplifier circuit adopted in this embodiment includes a switch tube and a JFET tube, the control terminal of the switch tube is connected to the Powerup signal, the gate of the JFET tube is connected to the sound sensor (1), and the source of the JFET tube is It is grounded, the drain is connected to the output port (15), the switch tube is connected in series with the source of the JFET tube, and the rest of the structure is the same as that of Embodiment 1. This scheme gives up the process of amplifying the analog signal, but directly outputs it.

Embodiment 3

[0031] Embodiment 3: In this embodiment, the analog preamplifier circuit includes an analog amplifier and a switch tube, the digital preamplifier circuit includes a Σ-Δ analog-to-digital modulator (6), and the input end of the analog amplifier is connected to a sound sensor (1), The output end of the analog amplifier is connected to the output port (15) through a switch tube, the output end of the analog amplifier is also connected to the input end of the Σ-Δ analog-digital modulator (6), and the control end of the switch tube is connected to the Powerup signal. The automatic switching control circuit part is the same as that of Embodiment 1. The analog amplifier acts as an amplifier for both the analog preamplifier circuit and the digital preamplifier circuit. The switch tube is turned on or off under the control of the automatic switching control circuit, thereby controlling whether the output port (15) has an analog signal output.

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Abstract

Disclosed is a digital-analog hybrid microphone, and aims at providing a microphone capable of outputting an analog signal and a digital signal. The digital-analog hybrid microphone comprises an acoustic sensor (1) and an output port (15), and further comprises an analog pre-amplifier circuit and a digital pre-amplifier circuit. The analog pre-amplifier circuit and the digital pre-amplifier circuit are connected to the acoustic sensor (1); the output port (15) is connected to the analog pre-amplifier circuit and the digital pre-amplifier circuit; the analog pre-amplifier circuit and the digital pre-amplifier circuit are also connected to an automatic switching control circuit which controls the two pre-amplifier circuits to work or not to work. The automatic switching control circuit can determine whether a connected host supports a digital signal or analog signal and then select a corresponding pre-amplifier circuit to amplify an acoustic signal received by the acoustic sensor and output the amplified acoustic signal to the host. The present invention is applicable to all acoustic output devices.

Description

technical field [0001] The invention relates to a sound recording device, in particular to a digital-analog hybrid microphone capable of automatically selecting an output signal as a digital signal or an analog signal according to the host type. Background technique [0002] Early microphones were all analog microphones. With the rapid development of digital technology and the anti-interference advantages of digital transmission, a large part of today's microphones use digital microphones. However, due to historical reasons and cost advantages, analog microphones will coexist with digital microphones for a long time. There are two types of hosts that accept microphone signals, one that supports analog signals and one that supports digital signals. Existing microphones can only work with matching hosts, which reduces the adaptability of the microphone and brings some inconvenience. [0003] The State Intellectual Property Office of the People's Republic of China published a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00H04R1/08
CPCH04R1/08H04R3/00H04R1/005
Inventor 陈锋奚剑雄
Owner SILICON STAR TECH