CN207677691U - Audio amplifier circuit and signal amplify module - Google Patents
Audio amplifier circuit and signal amplify module Download PDFInfo
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- CN207677691U CN207677691U CN201721852050.8U CN201721852050U CN207677691U CN 207677691 U CN207677691 U CN 207677691U CN 201721852050 U CN201721852050 U CN 201721852050U CN 207677691 U CN207677691 U CN 207677691U
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Abstract
A kind of audio amplifier circuit and signal amplify module, and audio amplifier circuit includes signal amplification module and the loud speaker that is connect with signal amplification module；It includes detection module and the power amplifier unit of connecting detection module that signal, which amplifies module,；Signal amplifies module and is equipped with primary input end, threshold value input and reference edge；Detection module is connect with primary input end, threshold value input and reference edge respectively；Power amplifier unit is equipped with mute control terminal and audio input end；The mute control terminal of power amplifier unit is connect with detection module, the primary input end of the audio input end connection audio amplifier circuit of power amplifier unit.Whether audio amplifier circuit and signal the amplification module of the utility model judge in original signal to include tire sound signal in a manner of hardware detecting module, power amplifier unit can adjust working condition in time according to the voltage level of its mute control terminal, thus audio amplifier circuit can in time be amplified tire sound signal, while filtering the bottom in original signal and making an uproar.
Description
Technical field
The utility model is related to electronic circuit technologies, amplify module more particularly to a kind of audio amplifier circuit and signal.
Background technology
Ultrasonic fetal gage is widely used in as a kind of portable medical electronic instrument in medical institutions or family, is monitoring
The important instrument of fetal heartbeat.Ultrasonic fetal gage is generally basede on the principle work of doppler ultrasound detection, but due to Doppler
The characteristic that the principle and circuit of ultrasound detection are intrinsic has the intrinsic noise of circuit and is output to loud speaker in no fetal heart rate signal,
Referred to as bottom is made an uproar.The method that conventional this bottom of removal is made an uproar, samples the signal of input with the ADC of MCU samplings, then sentences
Reading is that fetal heart rate signal or bottom are made an uproar, and if it is fetal heart rate signal, carries out over-sampling, then fetal heart rate signal is restored by ADC, passes through
Audio frequency power amplifier and loud speaker are crossed, tire sound signal is restored.However, remove the mode that bottom is made an uproar using MCU modes, according to the difference of MCU,
Fetal rhythm reduction has certain time-delay, and there is certain distortion.
Utility model content
Based on this, the utility model provides one kind and may filter that bottom is made an uproar, while amplifying to the audio that fetal heart rate signal amplifies in time
Circuit and signal amplify module.
In order to realize that the purpose of this utility model, the utility model use following technical scheme：
A kind of audio amplifier circuit, including signal amplify module and amplify the loud speaker that module is connect with the signal；Institute
State the power amplifier unit that signal amplification module includes detection module and the connection detection module；The signal amplification module is equipped with
Primary input end, threshold value input and reference edge；The detection module respectively with the primary input end, the threshold value input and
The reference edge connection；The power amplifier unit is equipped with mute control terminal and audio input end；The mute control of the power amplifier unit
End is connect with the detection module, and the audio input end of the power amplifier unit connects the primary input end of the audio amplifier circuit.
The audio amplifier circuit of the utility model judges whether wrapped in original signal detecting module in a manner of hardware
Sound signal containing tire, and the voltage level of the mute control terminal of power amplifier unit is adjusted, make power amplifier unit can be according to its mute control terminal
Voltage level and adjust working condition in time, thus audio amplifier circuit can in time be amplified tire sound signal, while mistake
It makes an uproar at bottom in filter original signal.
In one of the embodiments, the detection module include comparator U1, diode D1, the first current-limiting resistance R1,
Voltage stabilizing element C1, bleeder resistance R2 and switching tube Q1；The in-phase input end of the comparator U1 connects the signal and amplifies module
Primary input end, the inverting input of the comparator U1 connects the threshold value input of the signal amplification module；The comparison
The output end of device U1 connects the anode of the diode D1, the cathode of the diode D1 by the first current-limiting resistance R1 with
The control terminal of the switching tube Q1 connects；The control terminal of the switching tube Q1 is amplified by the voltage stabilizing element C1 and the signal
The reference edge of module connects, and the control terminal of the switching tube Q1 also amplifies module by the bleeder resistance R2 and the signal
Reference edge connects；The reference edge that the output end of the switching tube Q1 amplifies module with the signal is connect；The switching tube Q1's
Input terminal connects the power amplifier unit.
The detection module further includes the second current-limiting resistance R3 in one of the embodiments, and the switching tube Q1's is defeated
Enter end to connect with the second current-limiting resistance R3；The mute control terminal of the power amplifier unit is connect with the input terminal of the switching tube Q1.
The power amplifier unit is equipped with output end in one of the embodiments,；The loud speaker and the power amplifier unit
Output end connects.
The voltage stabilizing element C1 is capacitance in one of the embodiments,.
The switching tube Q1 is N metal-oxide-semiconductors in one of the embodiments,.
The diode D1 is Schottky diode in one of the embodiments,.
A kind of signal amplification module, which is characterized in that the power amplifier list including detection module and the connection detection module
Member；The signal amplification module is equipped with primary input end, threshold value input and reference edge；The detection module respectively with the master
Input terminal, the threshold value input and reference edge connection；The power amplifier unit is equipped with mute control terminal and audio input
End；The mute control terminal of the power amplifier unit is connect with the detection module, and the audio input end of the power amplifier unit connects institute
State the primary input end of audio amplifier circuit.
In one of the embodiments, the detection module include comparator U1, diode D1, the first current-limiting resistance R1,
Voltage stabilizing element C1, bleeder resistance R2 and switching tube Q1；The in-phase input end of the comparator U1 connects the signal and amplifies module
Primary input end, the inverting input of the comparator U1 connects the threshold value input of the signal amplification module；The comparison
The output end of device U1 connects the anode of the diode D1, the cathode of the diode D1 by the first current-limiting resistance R1 with
The control terminal of the switching tube Q1 connects；The control terminal of the switching tube Q1 is amplified by the voltage stabilizing element C1 and the signal
The reference edge of module connects, and the control terminal of the switching tube Q1 also amplifies module by the bleeder resistance R2 and the signal
Reference edge connects；The reference edge that the output end of the switching tube Q1 amplifies module with the signal is connect；The switching tube Q1's
Input terminal connects the power amplifier unit.
The detection module further includes the second current-limiting resistance R3 in one of the embodiments, and the switching tube Q1's is defeated
Enter end to connect with the second current-limiting resistance R3；The mute control terminal of the power amplifier unit is connect with the input terminal of the switching tube Q1.
Description of the drawings
Fig. 1 is the circuit diagram of the audio amplifier circuit of a preferred embodiment of the utility model；
Fig. 2 is the flow chart of the working method of audio amplifier circuit shown in FIG. 1.
Specific implementation mode
The utility model will be described more fully below for the ease of understanding the utility model,.But this practicality
It is novel to realize in many different forms, however it is not limited to embodiment described herein.On the contrary, providing these implementations
The purpose of example is to make the understanding of the disclosure of the utility model more thorough and comprehensive.
Unless otherwise defined, all of technologies and scientific terms used here by the article is led with the technology for belonging to the utility model
The normally understood meaning of technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.
Referring to Fig. 1, for the audio amplifier circuit 100 of one better embodiment of the utility model, for original signal
In tire sound signal be amplified.The audio amplifier circuit 100 includes signal amplification module 10 and connects with signal amplification module 10
The loud speaker 20 connect；It includes detection module 30 and the power amplifier unit 40 of connecting detection module 30 that signal, which amplifies module 10,；Signal is put
Big module 10 is equipped with primary input end Os, threshold value input Vt and reference edge Ref；Detection module 30 respectively with primary input end Os,
Threshold value input Vt and reference edge Ref connections；Power amplifier unit 40 is equipped with mute control terminal Mute and audio input end Ad；Power amplifier
The mute control terminal Mute of unit 40 is connect with detection module 30, the audio input end Ad connection audios amplification of power amplifier unit 40
The primary input end Os of circuit 100；Original signal is input to signal through primary input end Os and amplifies module 10, and detection module 30 is to original
The beginning amplitude of tire sound signal is judged that detection module 30 is connected according to the amplitude judging result control of original signal with power supply
Power amplifier unit 40 operating status, to, when recognizing tire sound signal, power amplifier unit 40 in time puts tire pressure signal
In big and output to loud speaker 20, when tire sound signal is not detected, power amplifier unit 40 stops amplification work, avoids power amplifier unit
40 pairs of bottoms, which are made an uproar, to be amplified, makes loud speaker output noise；Signal amplifies the reference of the reference edge Ref connection external circuits of module 10
Ground.
Detection module 30 include comparator U1, diode D1, the first current-limiting resistance R1, voltage stabilizing element C1, bleeder resistance R2,
Switching tube Q1 and the second current-limiting resistance R3；The primary input end Os of the in-phase input end connection signal amplification module 10 of comparator U1,
The threshold value input Vt of the inverting input connection signal amplification module 10 of comparator U1；The output end connection two of comparator U1
The cathode of the anode of pole pipe D1, diode D1 is connect by the first current-limiting resistance R1 with the control terminal of switching tube Q1；Switching tube Q1
Control terminal amplify the reference edge Ref of module 10 by voltage stabilizing element C1 and signal and connect, the control terminal of switching tube Q1 also passes through
The reference edge Ref that bleeder resistance R2 amplifies module 10 with signal is connect；The output end of switching tube Q1 and signal amplification module 10
Reference edge Ref connections；The input terminal of switching tube Q1 connects power amplifier unit 40, and the input terminal of switching tube Q1 also passes through the second current limliting
Resistance R3 is connect with external power supply.
Specifically, voltage stabilizing element C1 is capacitance；Switching tube Q1 is N metal-oxide-semiconductors；Diode D1 is Schottky diode.
Power amplifier unit 40 is additionally provided with power pins, and the power pins of power amplifier unit 40 are connect with power supply；Power amplifier unit 40 obtains
After obtaining working power, judge whether to need to be amplified original signal according to the voltage level of mute control terminal Mute, or
Judge whether to export loud speaker 20；Power amplifier unit 40 is equipped with output end.
Specifically, the mute control terminal Mute of power amplifier unit 40 is connect with the input terminal of switching tube Q1；Loud speaker 20 and work(
Put the output end connection of unit 40.
When audio amplifier circuit 100 is run, the primary input end Os that original signal amplifies module 10 through signal is separately input into
The in-phase input end of comparator U1 and the audio input end Ad of power amplifier unit 40；The inverting input of comparator U1 is connected to threshold
Be worth input terminal Vt, the threshold value input Vt input one of signal amplification module 10 according to bottom make an uproar amplitude and the cut-off of determination with reference to electricity
Pressure；Comparator U1 comparison original signals and cut-off reference voltage, when in original signal including tire sound signal, due to tire sound signal
Partial amplitude is larger, and the amplitude of original signal intermittently or is persistently more than cut-off reference voltage, the output end output of comparator U1
The output end of high level, comparator U1 is filled with charge by diode D1 and the first current-limiting resistance R1 to voltage stabilizing element C1, makes out
The voltage for closing the control terminal of pipe Q1 rises, and when the voltage of the control terminal of switching tube Q1 is more than the conducting voltage of switching tube Q1, opens
It is connected between the input terminal and output end of pass pipe Q1, the mute control terminal Mute of power amplifier unit 40 is made to be in low potential, connect electricity
The power amplifier unit 40 in source is immediately amplified original signal and after detecting that mute control terminal Mute is in low potential to raising
Sound device 20 exports amplified signal；It, may during there is tire sound signal due to the signal that tire sound signal is fluctuation
There is original signal amplitude and is less than cut-off reference voltage in interruption, due to being connected with two between the output end and resistance R1 of comparator U1
Pole pipe D1, thus can avoid the charge on voltage stabilizing element C1 be lost in from comparator U1, switching tube Q1 caused frequently to turn off, make it is mute
The spread of voltage of control terminal Mute, the final amplification effect for influencing tire sound signal；Since diode D1 is two pole of Schottky
Pipe, therefore diode D1 can quickly end, the charge to be further reduced voltage stabilizing element C1 is lost in through comparator U1, makes switch
The conducting of pipe Q1 is more stable.
After the tire sound signal in original signal disappears, only make an uproar the bottom of comprising in original signal, the vibration amplitude made an uproar the bottom of due to
Less than cut-off reference voltage, the output end of comparator U1 exports low level, and diode D1 ends, and the charge on voltage stabilizing element C1 is logical
It crosses bleeder resistance R2 to flow away, the voltage rapid decrease of the control terminal of switching tube Q1, Q1 is made to end in time, make mute control terminal Mute
Voltage rise to high potential, the power amplifier unit 40 powered on after detecting that mute control terminal Mute is in high potential, stand
Stop being amplified original signal or stopping, to 20 output signal of loud speaker, amplified output being made an uproar extremely the bottom of so as to avoid
Loud speaker 20.
It, can by detecting the voltage level of mute control terminal Mute because power amplifier unit 40 is in energization standby mode always
Quickly start the amplification to tire sound signal, avoids caused delay on hardware configuration, make the output sound in loud speaker 20
Keep good synchronous with the tire sound signal in original signal.
Referring to Fig. 2, the working method of the audio amplifier circuit 100 for one better embodiment of the utility model, including：
S10：Detection module 30 adjusts the voltage level of mute control terminal Mute according to the amplitude of original signal；
Specifically, detection module 30 compares original signal and cut-off reference voltage, when the amplitude of original signal exists
Intermittently or persistently it is higher than cut-off reference voltage in short time, detection module 30 makes mute control terminal Mute be connected to low potential；When
The amplitude of original signal is consistently less than cut-off reference voltage, and detection module 30 makes mute control terminal Mute be connected to high potential.
S20：Power amplifier unit 40 judges the voltage level of mute control terminal Mute；
S30：The case where when the voltage level of mute control terminal Mute is only made an uproar the bottom of comprising with original signal, is corresponding, power amplifier list
Member 40 stops being amplified original signal or stopping exporting loud speaker 20；
Specifically, when power amplifier unit detects that mute control terminal Mute is high potential, then original signal is put in stopping
Big or stopping exports loud speaker 20.
S40：The case where when the voltage level of mute control terminal Mute and original signal include tire sound signal corresponding, power amplifier
Unit 40 is amplified original signal and exports amplified signal to loud speaker 20；
Specifically, when power amplifier unit 40 detects that mute control terminal Mute for low potential, is then amplified original signal
And export amplified signal to loud speaker 20.
In the present embodiment, judge in original signal whether to include tire sound signal in a manner of hardware detecting module, and
Adjust power amplifier unit mute control terminal voltage level, make power amplifier unit can according to the voltage level of its mute control terminal and and
When adjust working condition, thus audio amplifier circuit can in time be amplified tire sound signal, while filter in original signal
It makes an uproar at bottom.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of audio amplifier circuit, which is characterized in that amplify module including signal and amplify what module was connect with the signal
Loud speaker；The signal amplification module includes the power amplifier unit of detection module and the connection detection module；The signal amplification
Module is equipped with primary input end, threshold value input and reference edge；The detection module respectively with the primary input end, the threshold value
Input terminal and reference edge connection；The power amplifier unit is equipped with mute control terminal and audio input end；The power amplifier unit
Mute control terminal is connect with the detection module, and the audio input end of the power amplifier unit connects the master of the audio amplifier circuit
Input terminal.
2. audio amplifier circuit according to claim 1, which is characterized in that the detection module includes comparator U1, two
Pole pipe D1, the first current-limiting resistance R1, voltage stabilizing element C1, bleeder resistance R2 and switching tube Q1；The homophase input of the comparator U1
End connects the primary input end of the signal amplification module, and the inverting input of the comparator U1 connects the signal and amplifies module
Threshold value input；The output end of the comparator U1 connects the anode of the diode D1, and the cathode of the diode D1 is logical
The first current-limiting resistance R1 is crossed to connect with the control terminal of the switching tube Q1；The control terminal of the switching tube Q1 passes through described steady
The reference edge that pressure element C1 amplifies module with the signal is connect, and the control terminal of the switching tube Q1 also passes through the bleeder resistance
The reference edge that R2 amplifies module with the signal is connect；The reference of the output end of the switching tube Q1 and signal amplification module
End connection；The input terminal of the switching tube Q1 connects the power amplifier unit.
3. audio amplifier circuit according to claim 2, which is characterized in that the detection module further includes the second current limliting electricity
R3 is hindered, the input terminal of the switching tube Q1 is connect with the second current-limiting resistance R3；The mute control terminal of the power amplifier unit with it is described
The input terminal of switching tube Q1 connects.
4. audio amplifier circuit according to claim 3, which is characterized in that the power amplifier unit is equipped with output end；It is described
Loud speaker is connect with the output end of the power amplifier unit.
5. audio amplifier circuit according to claim 2, which is characterized in that the voltage stabilizing element C1 is capacitance.
6. audio amplifier circuit according to claim 2, which is characterized in that the switching tube Q1 is N metal-oxide-semiconductors.
7. audio amplifier circuit according to claim 2, which is characterized in that the diode D1 is Schottky diode.
8. a kind of signal amplifies module, which is characterized in that the power amplifier unit including detection module and the connection detection module；
The signal amplification module is equipped with primary input end, threshold value input and reference edge；The detection module respectively with the primary input
End, the threshold value input and reference edge connection；The power amplifier unit is equipped with mute control terminal and audio input end；Institute
The mute control terminal for stating power amplifier unit is connect with the detection module, and the audio input end of the power amplifier unit connects the audio
The primary input end of amplifying circuit.
9. signal according to claim 8 amplifies module, which is characterized in that the detection module includes comparator U1, two
Pole pipe D1, the first current-limiting resistance R1, voltage stabilizing element C1, bleeder resistance R2 and switching tube Q1；The homophase input of the comparator U1
End connects the primary input end of the signal amplification module, and the inverting input of the comparator U1 connects the signal and amplifies module
Threshold value input；The output end of the comparator U1 connects the anode of the diode D1, and the cathode of the diode D1 is logical
The first current-limiting resistance R1 is crossed to connect with the control terminal of the switching tube Q1；The control terminal of the switching tube Q1 passes through described steady
The reference edge that pressure element C1 amplifies module with the signal is connect, and the control terminal of the switching tube Q1 also passes through the bleeder resistance
The reference edge that R2 amplifies module with the signal is connect；The reference of the output end of the switching tube Q1 and signal amplification module
End connection；The input terminal of the switching tube Q1 connects the power amplifier unit.
10. signal according to claim 9 amplifies module, which is characterized in that the detection module further includes the second current limliting
Resistance R3, the input terminal of the switching tube Q1 are connect with the second current-limiting resistance R3；The mute control terminal of the power amplifier unit and institute
State the input terminal connection of switching tube Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721852050.8U CN207677691U (en) | 2017-12-26 | 2017-12-26 | Audio amplifier circuit and signal amplify module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721852050.8U CN207677691U (en) | 2017-12-26 | 2017-12-26 | Audio amplifier circuit and signal amplify module |
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| Publication Number | Publication Date |
|---|---|
| CN207677691U true CN207677691U (en) | 2018-07-31 |
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ID=62971071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721852050.8U Active CN207677691U (en) | 2017-12-26 | 2017-12-26 | Audio amplifier circuit and signal amplify module |
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| CN (1) | CN207677691U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108063599A (en) * | 2017-12-26 | 2018-05-22 | 深圳京柏医疗科技股份有限公司 | Audio amplifier circuit and its method of work |
-
2017
- 2017-12-26 CN CN201721852050.8U patent/CN207677691U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108063599A (en) * | 2017-12-26 | 2018-05-22 | 深圳京柏医疗科技股份有限公司 | Audio amplifier circuit and its method of work |
| CN108063599B (en) * | 2017-12-26 | 2024-05-28 | 深圳京柏医疗科技股份有限公司 | Audio amplifying circuit and working method thereof |
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