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Audio signal detection circuit using window comparator

A window comparator, audio signal technology, applied in the field of electronics, can solve the problems of poor anti-interference ability, low resolution, large size, etc., and achieve the effect of reducing circuit area, improving resolution, and increasing circuit area

Active Publication Date: 2022-03-18
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the deficiencies of the above-mentioned existing audio signal detection technology, and proposes an audio signal detection circuit using a window comparator, which is used to solve the problems of high power consumption, large volume, low resolution and poor anti-interference ability in the prior art The problem

Method used

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  • Audio signal detection circuit using window comparator

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Embodiment Construction

[0017] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0018] Refer to the attachment figure 1 Further, the overall configuration of the circuit of the present invention will be described in further detail.

[0019] The circuit of the present invention includes an active bandpass filter, a window comparator, a Schmitt trigger, a drive circuit.

[0020] The two-stage operational amplifier AMP in the active band pass filter connects the second reference voltage V. 2 , Input V in After the resistance R1, the capacitance C1 is connected in series, and the inverting input terminal of the two-stage operational amplifier AMP is connected in series, and the resistance R2 and the resistor R3 are connected in series, and the inverting input terminal and the output end of the two-stage operational amplifier AMP are connected in series, the capacitor C2 A second reference voltage V is connected between one end of the ...

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Abstract

The invention discloses an audio signal detection circuit using a window comparator, which comprises an active bandpass filter, a window comparator, a Schmitt trigger and a driving circuit. The active band-pass filter filters the amplified signal to control the window comparator to charge and discharge the energy storage capacitor. The relationship between the amount of charging charge and the amount of discharging charge in each cycle determines the level of the input terminal of the Schmitt trigger. After driving circuit output. The present invention solves the problems of high power consumption, large volume, low resolution and poor anti-interference ability in the prior art, makes the circuit structure of the present invention simple and easy to integrate, and realizes the detection of audio signals with high reliability and high resolution. It can be used as a 22kHz IF switching switch in satellite TV receiving equipment, and can also be used to wake up standby audio equipment.

Description

Technical field [0001] The present invention belongs to the field of electronic technology, further involves an audio signal detecting circuit using a window comparator in an analog integrated circuit. The present invention can be used as a 22kHz intermediate frequency switching switch in the satellite digital television receiving apparatus, and can also be applied to awakening standby audio devices. Background technique [0002] Today's satellite television receiver uses the KU band antenna, since the frequency range of the KU band is between 10.7 GHz to 12.75GHz, its bandwidth is larger than the frequency range of the receiver intermediate frequency input 950MHz ~ 2150 MHz, in order to cover the entire KU band, The Ku band is divided into 10.7GHz to 11.9GHz and 11.55GHz to 12.75 GHz. There correspond to the 9.75 GHz and 10.6 GHz high and low frequency vibration of the high frequency head (LNB) to achieve the reception cover of the full KU band. . There is only one work in both ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/24
CPCH03K5/2472
Inventor 袁冰肖浪骐王炳源李江山
Owner XIDIAN UNIV
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