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Audio signal detection circuit adopting window comparator

A window comparator, audio signal technology, applied in the electronic field, can solve the problems of poor anti-interference ability, low resolution, large size, etc., to reduce the circuit area, solve the high power consumption, and improve the resolution.

Active Publication Date: 2020-11-17
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

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  • Audio signal detection circuit adopting window comparator

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Embodiment Construction

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

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

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

[0020] The noninverting input terminal of the two-stage operational amplifier AMP in the active bandpass filter is connected to the second reference voltage V 2 , input V in , resistor R1, and capacitor C1 are connected in series with the inverting input terminal of the two-stage operational amplifier AMP, and the resistor R2 and resistor R3 are connected in series between the inverting input terminal and the output terminal of the two-stage operational amplifier AMP. Capacitor C2 Connected between the inverting input terminal and the output terminal of the two-stage operati...

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Abstract

The invention discloses an audio signal detection circuit adopting a window comparator. The detection circuit comprises an active band-pass filter, the window comparator, a Schmitt trigger and a driving circuit. A signal filtered and amplified by the active band-pass filter controls the window comparator to charge and discharge the energy storage capacitor, the magnitude relation between the charging charge quantity and the discharging charge quantity in each period determines the electrical level of the input end of the Schmitt trigger, and the outputing is carried out through the driving circuit. According to the invention, the problems of high power consumption, large size, low resolution and poor anti-interference capability in the prior art are solved, so that the circuit is simple instructure and convenient to integrate, realizes high-reliability and high-resolution detection of audio signals, can be used as a 22kHz intermediate frequency change-over switch in satellite television receiving equipment, and can also be applied to awakening standby audio equipment.

Description

technical field [0001] The invention belongs to the field of electronic technology, and further relates to an audio signal detection circuit using a window comparator in an analog integrated circuit. The invention can be used as a 22kHz intermediate frequency switching switch in satellite digital TV receiving equipment, and can also be applied to wake up standby audio equipment. Background technique [0002] Today's satellite TV receivers use Ku-band antennas. Since the frequency range of Ku-band is between 10.7GHz and 12.75GHz, its bandwidth greatly exceeds the frequency range of receiver IF input 950MHz-2150MHz. In order to allow the receiver to cover the entire Ku-band, The Ku-band is divided into two frequency bands, 10.7GHz-11.9GHz and 11.55GHz-12.75GHz, corresponding to the 9.75GHz and 10.6GHz high and low frequency local oscillators of the LNB to achieve full Ku-band reception coverage . Only one of the two local oscillators is always working, that is, the switching...

Claims

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Application Information

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Patent Type & Authority Applications(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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