CN201142670Y

CN201142670Y - Adjustable high-sensibility high-resolution audio-detector

Info

Publication number: CN201142670Y
Application number: CNU2007200983249U
Authority: CN
Inventors: 逄玉春; 郑虹
Original assignee: Tianjin University of Technology
Current assignee: Tianjin University of Technology
Priority date: 2007-12-05
Filing date: 2007-12-05
Publication date: 2008-10-29
Anticipated expiration: 2017-12-05

Abstract

The utility model relates to an adjustable high sensitive high-definition audio detector, which solves the problems with the prior audio detector of high dynamic power consumption, poor definition, small frequency response range, signal distortion, etc. The audio detector comprises MIC, a circuit of an operational amplifier and an output circuit. An audio signal collected by MIC is processed through the circuit of the operational amplifier, input to the output circuit and then output. Since the double operational amplifier design circuit is adopted, the dynamic power consumption of the audio signal during transmission is greatly reduced, thus allowing the audio detector to be not be limited by application environment and be used in static and dynamic environment. Meanwhile, audio detector can be used in series with frequency response range increasing from 50-5,000Hz to 50-10,000Hz, maximum distortionless output increasing from 3-6v/vpp to 3-10v/vpp and greatly extended dynamic range. The audio detector solves the problem of high dynamic power consumption, poor definition, small frequency response range, signal distortion, etc. and greatly reduces use cost.

Description

The highly sensitive HD Audio detector of scalable

[technical field]:

The utility model belongs to modernizing teaching, bank and other security protection electronic technology field, particularly a kind of audio detector.

[background technology]:

In modernizing teaching, bank and other security protection electronic technology field system, often need gather, record various sound.As: the security protection in teachers' instruction, bank transaction and various important places or the like.The audio detector that uses generally all is the audio detector with the design of low-power audio power amplification circuit now.Because this technology is to adopt the power delivery audio signal, so have dynamic power consumption height, poor definition in the transmission of audio signals process, problems such as reaching distorted signals is hanged down in gain.

[summary of the invention]:

The purpose of this utility model is to solve existing audio detector to have dynamic power consumption height, poor definition, and problems such as reaching distorted signals is hanged down in gain, provides a kind of scalable highly sensitive HD Audio detector.

The highly sensitive HD Audio detector of the scalable that the utility model provides comprises that MIC, dual operational amplifier circuit and output circuit constitute, and imput output circuit after the audio signal process dual operational amplifier processing of circuit that MIC gathers is exported through output again.

Said operation amplifier circuit comprises the operational amplifier of two serial connections, the positive input of first operational amplifier connects the intermediate node of two inclined to one side value resistance that insert between the power supply, insert the feedback loop that constitutes by adjustable resistance between its reverse input end and the output, feed back between the reverse input end of second operational amplifier and the output and be connected, its output connects this circuit output end behind capacitance, and the resistance of contacting connects inverse output terminal.

Advantage and good effect: the utility model makes that audio signal direct voltage gain in transmission course is high owing to adopt the dual operational amplifier design circuit, and the output voltage distortion factor is little; Reduced the dynamic power consumption electric current; Because operational amplifier high-gain, internal frequency compensation, unit gain bandwidth and characteristics such as low input offset voltage and offset current, make definition be greatly improved, greatly reduce signal distortion when improving gain again, simultaneously, Hz-KHz is increased to 50-10000HZ by 50-5000HZ; Maximum undistorted output is increased to 3-10V/vpp from 3-6V/vpp, and dynamic range strengthens greatly; Solved dynamic power consumption height, poor definition, Hz-KHz is low and problem such as audio signal reduction distortion, also greatly reduces use cost simultaneously.

[description of drawings]:

Fig. 1 is the audio detector block diagram that the utility model provides;

Fig. 2 is the audio detector circuit theory diagrams.

[embodiment]:

Embodiment 1

As shown in Figure 1, the highly sensitive HD Audio detector of the scalable that the utility model provides, comprise that MIC, operation amplifier circuit and output circuit constitute, the audio signal that MIC gathers is handled the back imput output circuit through operation amplifier circuit, exports through output again.

At dynamic power consumption height, poor definition, Hz-KHz is low and problem such as audio signal reduction distortion, at first must change original technology mode, changing the low-power audio power amplification circuit is integrated dual operational amplifier circuit, and it is undistorted that the audio signal that MIC is gathered is handled the back waveform through operation amplifier circuit; To guarantee reaching reduction audio signal at the receiving terminal complete display in transmission course sound intermediate frequency signal high gain, undistorted.Solve the audio signal high frequency and be compressed, transmitted problems (Fig. 1) such as dynamic power consumption height and audio signal reduction distortion.

The physical circuit of this audio detector is referring to Fig. 2, for obtaining good serviceability, increases by a value resistance R 2 partially when using the OP1 of dual operational amplifier, makes the drift of operational amplifier little, noise is little; For solving the contradiction of static environment and dynamic environment in use, special R4 is designed to adjustable resistance, solved this difficult problem.Increase that operational amplifier OP2 (Fig. 2) has thoroughly solved the dynamic power consumption height, gain is low and poor definition, Hz-KHz is low and problem such as audio signal distortion.

Claims

1, the highly sensitive HD Audio detector of a kind of scalable is characterized in that this audio detector comprises that MIC and operation amplifier circuit constitute, and imput output circuit after the audio signal process dual operational amplifier processing of circuit that MIC gathers is exported through output.

2, the highly sensitive HD Audio detector of the described scalable of root a tree name claim 1, it is characterized in that said operation amplifier circuit comprises the operational amplifier of two serial connections, the positive input of first operational amplifier connects the intermediate node of two inclined to one side value resistance that insert between the power supply, insert the feedback loop that constitutes by resistance between its reverse input end and the output, feed back between the reverse input end of second operational amplifier and the output and be connected, its output connects this circuit output end behind capacitance, and the resistance of contacting connects inverse output terminal.