CN203480829U - Analog audio signal self-check system - Google Patents
Analog audio signal self-check system Download PDFInfo
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- CN203480829U CN203480829U CN201320588202.3U CN201320588202U CN203480829U CN 203480829 U CN203480829 U CN 203480829U CN 201320588202 U CN201320588202 U CN 201320588202U CN 203480829 U CN203480829 U CN 203480829U
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Abstract
The utility model belongs to the field of analog audio signal self-check technology and discloses an analog audio signal self-check system. The analog audio signal self-check system comprises a change-over switch, a relay used for switching leading-out ends of the change-over switch, a central processing unit used for controlling working condition of the relay and a self-check circuit used for detecting amplitude of an analog audio signal. Two incoming ends of the change-over switch are correspondingly electrically connected to two analog audio signal output ends of the central processing unit. the change-over switch has four leading-out ends, wherein a first leading-out end and a second leading-out end are respectively used for outputting analog audio signals; and a third leading-out end and a fourth leading-out end are correspondingly electrically connected to two input ends of the self-check circuit. Output ends of the self-check circuit are electrically connected to the central processing unit.
Description
Technical field
The utility model belongs to simulated audio signal self-checking field, particularly a kind of simulated audio signal self-checking system.
Background technology
The beginning of this century, digital circuit is universal greatly, has occurred that the probability that the phenomenon that simulation system and digital display circuit coexist, its complicacy cause all kinds of problems to occur improves greatly, thereby need self-detection mechanism comparatively comprehensively and efficiently on airborne communication facilities.Existing airborne communication facilities does not have design simulation sound signal self-checking circuit, cannot carry out fast detecting and maintenance for simulated audio signal.
Utility model content
The purpose of this utility model is to propose a kind of simulated audio signal self-checking system.This simulated audio signal self-checking system, by adopting self-checking circuit to detect the amplitude of simulated audio signal, can prevent that the problem that amplitude is too small or excessive from appearring in simulated audio signal.
For realizing above-mentioned technical purpose, the utility model adopts following technical scheme to be achieved.
A simulated audio signal self-checking system, comprising: switch, for the relay of switch transition switch wire outlet terminal, for the central processing unit of pilot relay duty, self-checking circuit for the amplitude of simulated audio signal is detected; Two ends of incoming cables of described switch are electrically connected to respectively the simulated audio signal output terminal of central processing unit; Described switch has four leading-out terminals, and wherein, the first leading-out terminal and the second leading-out terminal are respectively used to outwards export simulated audio signal, corresponding two input ends that are electrically connected to self-checking circuit of the 3rd leading-out terminal and the 4th leading-out terminal; The output terminal of described self-checking circuit is electrically connected to central processing unit.
Feature of the present utility model and further improvement are:
Described self-checking circuit comprises: bridge rectifier circuit, and on four brachium pontis of described bridge rectifier circuit, correspondence is provided with the first diode, the second diode, the 3rd diode and the 4th diode; Corresponding the 3rd leading-out terminal and the 4th leading-out terminal that is electrically connected to switch of two input ends of described bridge rectifier circuit; Successively and be connected to filter capacitor and window comparator, the output terminal of described window comparator is electrically connected to central processing unit to two output terminals of described bridge rectifier circuit.
Described central processing unit is used for receiving simulated audio signal, for by the output of described simulated audio signal, and for receiving trigger pip, for according to trigger pip, pilot relay duty; Described self-checking circuit is for detecting the amplitude of simulated audio signal, for exporting testing result to central processing unit.
Described bridge rectifier circuit and filter capacitor are for changing corresponding direct current signal by simulated audio signal, described window comparator is set with upper limit threshold and lower threshold, described window comparator is for judging the magnitude relationship between amplitude, upper limit threshold and the lower threshold of described direct current signal, for exporting judged result to central processing unit, described in judgment result is that the amplitude detection result of simulated audio signal.
The 3rd leading-out terminal of described switch is electrically connected to the common node of the negative electrode of the first diode and the anode of the second diode, and the 4th leading-out terminal of described switch is electrically connected to the common node of the anode of the 3rd diode and the negative electrode of the 4th diode; One end of described filter capacitor is electrically connected to the common node of the negative electrode of the second diode and the negative electrode of the 3rd diode, and the other end of described filter capacitor is electrically connected to the common node of the anode of the first diode and the anode of the 4th diode.
The beneficial effects of the utility model are: by adopting self-checking circuit to detect the amplitude of simulated audio signal, can prevent that the problem that amplitude is too small or excessive from appearring in simulated audio signal.
Accompanying drawing explanation
Fig. 1 is the circuit connection diagram of a kind of simulated audio signal self-checking system of the present utility model;
Fig. 2 is self-checking circuit internal circuit connection diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
With reference to Fig. 1, it is the circuit connection diagram of a kind of simulated audio signal self-checking system of the present utility model; With reference to Fig. 2, it is self-checking circuit internal circuit connection diagram of the present utility model.This simulated audio signal self-checking system mainly comprises central processing unit, relay, switch K and self-checking circuit.
In the utility model embodiment, switch K has two ends of incoming cables and four leading-out terminals, wherein two ends of incoming cables are all electrically connected to the simulated audio signal output terminal of central processing unit, and switch K outwards exports simulated audio signal by the first leading-out terminal and the second leading-out terminal; Or to self-checking circuit, export simulated audio signal by the 3rd leading-out terminal and the 4th leading-out terminal.The outlet line of switch K is selected to be controlled by relay.In the utility model embodiment, central processing unit is electrically connected to relay, for the duty of pilot relay, and corresponding two ends of incoming cables that are electrically connected to switch K of two simulated audio signal output terminals of central processing unit.Central processing unit, when receiving a road simulated audio signal, is exported this simulated audio signal; Central processing unit sends corresponding control signal to relay, and Control switch K selects the first leading-out terminal and the second leading-out terminal to carry out signal output.Now, this road simulated audio signal can outwards be exported by the first leading-out terminal and the second leading-out terminal of switch K.When needs carry out amplitude detection to simulated audio signal, can send corresponding trigger pip to central processing unit, for example, central processing unit is electrically connected to host computer, by host computer, to central processing unit, send corresponding trigger pip.Central processing unit is received after trigger pip, to relay, send corresponding control signal, Control switch K selects the 3rd leading-out terminal and the 4th leading-out terminal to carry out signal output, now self-checking circuit is received two-way simulated audio signal, and self-checking circuit detects the amplitude of this two-way simulated audio signal.The output terminal of self-checking circuit is electrically connected to central processing unit, for exporting the amplitude detection result of simulated audio signal to central processing unit.
With reference to Fig. 2, in the utility model embodiment, self-checking circuit is comprised of bridge rectifier circuit, filter capacitor C and window comparator.Wherein, bridge rectifier circuit comprises the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4, and the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4 correspondence are arranged on four brachium pontis.Corresponding the 3rd leading-out terminal and the 4th leading-out terminal that is electrically connected to switch K of two input ends of bridge rectifier circuit, two output terminals of bridge rectifier circuit are also connected with filter capacitor C.Specifically, the 3rd leading-out terminal of switch K is electrically connected to the common node of the negative electrode of the first diode D1 and the anode of the second diode D2, and the 4th leading-out terminal of switch K is electrically connected to the common node of the anode of the 3rd diode D3 and the negative electrode of the 4th diode D4; One end of filter capacitor C is electrically connected to the common node of the negative electrode of the second diode D2 and the negative electrode of the 3rd diode D3, and the other end of filter capacitor C is electrically connected to the common node of the anode of the first diode D1 and the anode of the 4th diode D4.Bridge rectifier circuit and filter capacitor C for the simulated audio signal that inputs to self-checking circuit is converted to direct current signal, then judge the amplitude of direct current signal, can draw the amplitude of above-mentioned simulated audio signal.
With reference to Fig. 2, in the utility model embodiment, two output terminals of bridge rectifier circuit and meet filter capacitor C after go back and be connected to window comparator.In window comparator, the common node of the negative electrode of the second diode D2 and the negative electrode of the 3rd diode D3, after being connected one end of filter capacitor C, is also electrically connected to the common node of the normal phase input end of one end of the first resistance R 1, the inverting input of the first operational amplifier A R1 and the second operational amplifier A R2.The common node of the anode of the anode of the first diode D1 and the 4th diode D4, after being electrically connected to the other end of filter capacitor C, is also electrically connected to the common node of one end of ground potential GND, the 4th resistance R 4 and the earth terminal of the second operational amplifier A R2.The other end of the 4th resistance R 4 is electrically connected to the common node of the inverting input of the second operational amplifier A R2 and one end of the 3rd resistance R 3.The other end of the 3rd resistance R 3 is electrically connected to the common node of the normal phase input end of the first operational amplifier A R1 and one end of the second resistance R 2.The other end electric connection of power supply VCC of the first resistance R 1, the other end of the second resistance R 2, the common node of the power end of the first operational amplifier A R1.The output terminal of the output terminal of the first operational amplifier A R1 and the second operational amplifier A R2 is for exporting the amplitude detection result of simulated audio signal.In the utility model embodiment, window comparator is provided with upper limit threshold u1 and lower threshold u2(u1>u2), can judge the magnitude relationship between amplitude, upper limit threshold u1 and the lower threshold u2 of simulated audio signal by window comparator.Upper limit threshold u1 and lower threshold u2 determine by the resistance of the first resistance R 1, the second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4, therefore can, by selecting the first resistance R 1, the second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4 of suitable resistance, determine corresponding upper limit threshold u1 and lower threshold u2.Bridge rectifier circuit is used for the simulated audio signal that inputs to self-checking circuit to be converted to the direct current signal that amplitude is identical with filter capacitor C, in the utility model embodiment, central processing unit can be by judgement the first operational amplifier A R1 and the second operational amplifier A R2 the level height of output signal, determine the magnitude relationship between amplitude, upper limit threshold u1 and the lower threshold u2 of above-mentioned direct current signal.If the amplitude of direct current signal is more than or equal to upper limit threshold u1, the first operational amplifier A R1 exports high level signal, and the second operational amplifier A R2 output low level signal; If the amplitude of direct current signal is less than upper limit threshold u1 and is greater than lower threshold u2, the first operational amplifier A R1 and the equal output low level signal of the second operational amplifier A R2; If the amplitude of direct current signal is less than or equal to lower threshold u2, the first operational amplifier A R1 output low level signal, and the second operational amplifier A R2 output high level signal.Because the amplitude of above-mentioned direct current signal is identical with the amplitude that inputs to the simulated audio signal in self-checking circuit, so according to foregoing, central processing unit can be judged the magnitude relationship between amplitude, upper limit threshold u1 and the lower threshold u2 that inputs to the simulated audio signal in self-checking circuit, thereby can provide reference for maintenance of equipment.
In the utility model embodiment, if need to carry out amplitude detection to multi-channel analog sound signal, only need correspondence that a plurality of switches and a plurality of self-checking circuit are set, multi-channel analog sound signal is inputed to a plurality of self-checking circuits by correspondence a plurality of switches to be measured, just can to multi-channel analog sound signal, carry out amplitude detection respectively.
With reference to Fig. 1, in the utility model embodiment, audio frequency processing circuit can also be set, and the input end of audio frequency processing circuit is electrically connected to the simulated audio signal output terminal of central processing unit, corresponding two ends of incoming cables that are electrically connected to switch K of two output terminals of audio frequency processing circuit.Now, audio frequency processing circuit can carry out corresponding processing to the simulated audio signal of central processing unit output as required, then the simulated audio signal after processing is divided into two-way and exports switch K to.Also audio frequency processing circuit can be arranged on to the first leading-out terminal and the second leading-out terminal of switch K, the input end of audio frequency processing circuit is electrically connected to the first leading-out terminal and the second leading-out terminal of switch K.
The utility model is based on existing airborne communication product, by adopting special-purpose self-checking circuit to detect the amplitude of simulated audio signal.This utility model can cover all analogue audio frequency passages, can prevent that the problem that amplitude is too small or excessive from appearring in simulated audio signal.
Obviously, those skilled in the art can carry out various changes and modification and not depart from spirit and scope of the present utility model the utility model.Like this, if within of the present utility model these are revised and modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model is also intended to comprise these changes and modification interior.
Claims (3)
1. a simulated audio signal self-checking system, it is characterized in that, comprising: switch (K), for the relay of switch transition switch (K) leading-out terminal, for the central processing unit of pilot relay duty, self-checking circuit for the amplitude of simulated audio signal is detected; Two ends of incoming cables of described switch (K) are electrically connected to respectively the simulated audio signal output terminal of central processing unit; Described switch (K) has four leading-out terminals, and wherein, the first leading-out terminal and the second leading-out terminal are respectively used to outwards export simulated audio signal, corresponding two input ends that are electrically connected to self-checking circuit of the 3rd leading-out terminal and the 4th leading-out terminal; The output terminal of described self-checking circuit is electrically connected to central processing unit.
2. a kind of simulated audio signal self-checking system as claimed in claim 1, it is characterized in that, described self-checking circuit comprises: bridge rectifier circuit, and on four brachium pontis of described bridge rectifier circuit, correspondence is provided with the first diode (D1), the second diode (D2), the 3rd diode (D3) and the 4th diode (D4); Corresponding the 3rd leading-out terminal and the 4th leading-out terminal that is electrically connected to switch (K) of two input ends of described bridge rectifier circuit; Successively and be connected to filter capacitor (C) and window comparator, the output terminal of described window comparator is electrically connected to central processing unit to two output terminals of described bridge rectifier circuit.
3. a kind of simulated audio signal self-checking system as claimed in claim 2, it is characterized in that, the 3rd leading-out terminal of described switch (K) is electrically connected to the common node of the negative electrode of the first diode (D1) and the anode of the second diode (D2), and the 4th leading-out terminal of described switch (K) is electrically connected to the common node of the anode of the 3rd diode (D3) and the negative electrode of the 4th diode (D4); One end of described filter capacitor (C) is electrically connected to the common node of the negative electrode of the second diode (D2) and the negative electrode of the 3rd diode (D3), and the other end of described filter capacitor (C) is electrically connected to the common node of the anode of the first diode (D1) and the anode of the 4th diode (D4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320588202.3U CN203480829U (en) | 2013-09-23 | 2013-09-23 | Analog audio signal self-check system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320588202.3U CN203480829U (en) | 2013-09-23 | 2013-09-23 | Analog audio signal self-check system |
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| Publication Number | Publication Date |
|---|---|
| CN203480829U true CN203480829U (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320588202.3U Expired - Lifetime CN203480829U (en) | 2013-09-23 | 2013-09-23 | Analog audio signal self-check system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104408835A (en) * | 2014-10-21 | 2015-03-11 | 深圳市易联技术有限公司 | Anti-interference device applied to POS terminal wired audio communication |
| CN109348363A (en) * | 2018-08-31 | 2019-02-15 | 西安中兴新软件有限责任公司 | A kind of audio-frequency detection and device, storage medium |
-
2013
- 2013-09-23 CN CN201320588202.3U patent/CN203480829U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104408835A (en) * | 2014-10-21 | 2015-03-11 | 深圳市易联技术有限公司 | Anti-interference device applied to POS terminal wired audio communication |
| CN104408835B (en) * | 2014-10-21 | 2018-01-12 | 深圳市易联技术有限公司 | A kind of means for anti-jamming in the communication applied to POS terminal wireline audio |
| CN109348363A (en) * | 2018-08-31 | 2019-02-15 | 西安中兴新软件有限责任公司 | A kind of audio-frequency detection and device, storage medium |
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Granted publication date: 20140312 |
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