CN207589159U - The multiple sound resource audio switch that intelligently detecting switches - Google Patents
The multiple sound resource audio switch that intelligently detecting switches Download PDFInfo
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- CN207589159U CN207589159U CN201721903482.7U CN201721903482U CN207589159U CN 207589159 U CN207589159 U CN 207589159U CN 201721903482 U CN201721903482 U CN 201721903482U CN 207589159 U CN207589159 U CN 207589159U
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Abstract
The obtained multiple sound resource of the utility model audio switch that intelligently detecting switches, the detecting of audio signal is realized using the detection module with subtracter, comparator；The switch and handoff functionality of power amplifier audio signal are realized to the Audio conversion module of pipe using the NMOS with N-channel；State analysis is carried out to sampled signal using MCU, the intelligence switching of source of sound is carried out, has abandoned previous mechanical switch or relay mode, the automatic detection and switching of audio are realized by circuit completely, with the characteristics of at low cost, service life is long, and intelligence degree is high.
Description
Technical field
The utility model is related to a kind of audio switch, particularly a kind of multiple sound resource Audio conversion that intelligently detecting switches
Device.
Background technology
With auto industry flourish and the progress of electronics technology, automobile electronics are towards multi-functional, intelligent
Direction rapidly develop, public transit system is no exception, often there are media equipment on bus, including intelligent reporting station
Device, television set, megaphone etc..Distinct device has different suppliers, there is respectively independent power amplification system, connects Che Shengyang
Sound device can work normally.
During public transport company's purchase of vehicles, loud speaker harness is embedded among vehicle body in the usual way, to meet public transport fortune
Row demand fills various product after needing, and by taking station reporting instrument and television set as an example, two equipment need to share vehicle sound loud speaker, such as station reporting instrument
Using left speaker, television set uses right speaker, and two groups of equipment, which are independently operated, to seem, to be independent of each other, but actually makes
With in the process, when bus, which reaches appointed place, to be called out the stops, voice of calling out the stops adulterates the sound of television set, to effect of calling out the stops
There is certain influence in fruit, part passenger can occur mistake due to report is unclear and stand, miss the stop.When there are during three tunnels or more equipment,
It even needs to share a certain group of loud speaker, can generate mutual interference between equipment even results in equipment damage.
Current power amplifier signal switching apparatus common on the market is mostly using mechanical switch or relay mode, two-way power amplifier sound
Frequency signal is coupled with the both sides of single-pole double-throw switch (SPDT) or relay both sides, and switch or the output connection of relay common end are raised one's voice
Device when needing switching sound source, is achieved by manual switching, though which can realize the switching of high-power audio signal,
But practical operation need to be participated in manually, and power amplifier signal code is larger, and contact is easily struck sparks oxidation in switching process, service life
It is limited by switch electric property, being unsuitable for applying calling out the stops etc. in public transport needs the scene of frequent switching.
Utility model content
To solve the above problems, intelligently detected the utility model proposes a kind of multichannel source of sound, and automated intelligent switches, and
The multiple sound resource audio switch that intelligently detecting switches of service life length.
The multiple sound resource audio switch that intelligently detecting switches of the utility model design, including audio switching unit, MCU controls
Unit and detection module processed, the audio switching unit are equipped with audio input and audio output interface, MCU control unit
It is connect with audio switching unit, detection module is connect with MCU control unit, and detection module is also connect with audio input.
Further embodiment is that the audio switching unit is included by NMOS tube, and AUDIOIN interfaces, AUDIOOUT connect
The switching circuit of mouth, CTRL+ interfaces and CTRL- interfaces composition, it is symmetrical between the AUDIOIN interfaces and AUDIOOUT interfaces
Two NMOS tubes of series connection, the G feet of two NMOS tubes are all connected with CTRL+ interfaces, and connection CTRL- connects between two NMOS tubes
Mouthful, there is voltage V by transformer input between CTRL+ and CTRL-.
Further embodiment is that the detection module includes amplifier U1A and amplifier U1B, amplifier U1A input terminals connection sound
Two signal wires of frequency, the output terminal of amplifier U1A are connected to the input terminal of amplifier U1B by half-wave rectifying circuit, amplifier U1B's
Another input terminal connects reference level Vref, and the output terminal of amplifier U1B is connected to MCU control unit.
The audio switch of the intelligent detecting switching of the obtained multiple sound resource of the utility model, using subtracter, comparator come
Realize the detecting of audio signal；The switch and handoff functionality of power amplifier audio signal are realized to pipe using the NMOS of N-channel；Using
MCU carries out state analysis to sampled signal, carries out the intelligence switching of source of sound, has abandoned previous mechanical switch or relay mould
Formula realizes the automatic detection and switching of audio by circuit completely, has at low cost, and service life is long, and intelligence degree is high
The characteristics of.
Description of the drawings
Fig. 1 is the audio switching unit electrical block diagram of the utility model.
Fig. 2 is the utility model audio switching unit NMOS tube electric operation control circuit figure.
Fig. 3 is the detection module electrical block diagram of the utility model.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describe.
Embodiment 1.
As shown in Figs. 1-3, the multiple sound resource audio switch that intelligently detecting switches of the present embodiment description, including Audio conversion
Unit, MCU control unit and detection module, the audio switching unit are equipped with audio input and audio output interface,
MCU control unit is connect with audio switching unit, and detection module is connect with MCU control unit, and detection module is also defeated with audio
Enter connection.
The audio switching unit is included by NMOS tube, AUDIOIN interfaces, AUDIOOUT interfaces, CTRL+ interfaces and
The switching circuit of CTRL- interfaces composition, symmetrically connect two NMOS between the AUDIOIN interfaces and AUDIOOUT interfaces
Pipe, the G feet of two NMOS tubes are all connected with CTRL+ interfaces, CTRL- interfaces, CTRL+ and CTRL- are connected between two NMOS tubes
Between by transformer input have voltage V.
The detection module includes amplifier U1A and amplifier U1B, and amplifier U1A input terminals connect two signal wires of audio,
The output terminal of amplifier U1A is connected to the input terminal of amplifier U1B by half-wave rectifying circuit, and another input terminal of amplifier U1B connects
Reference level Vref is connect, the output terminal of amplifier U1B is connected to MCU control unit.
The audio switch of the intelligent detecting switching of the described multiple sound resource of the present embodiment, using NMOS tube road bidirectional conduction,
Smaller Rds values and large current characteristic realize the switch of power amplifier audio signal, and audio switching unit is by multiple moulds shown in FIG. 1
Block is formed, and realizes the switching of power amplifier audio signal.As shown in Figure 1, during work, power amplifier audio signal AUDIO+, AUDIO- is defeated
Enter to S1 ends, when NMOS tube Q1, Q2, Q3, Q4 are connected, it is defeated that AUDIO+, AUDIO- are converted to AUDIO+_OUT, AUDIO-_OUT
Go out to loud speaker.
Difficult point is that when Q1, Q2, Q3, Q4 are connected D level points change with S1 level states, and level state is in VDD
With changing between-VDD, if applying a fixed level at G ends, the pressure difference between G points and D points will appear deficiency with by NMOS
Pipe is opened, and Q1, Q2, Q3, Q4 will be in cut-off state, and there are desultory situations for audio broadcasting.Therefore how audio is solved
During broadcasting, NMOS tube road conduction problem can be the key of this case.The present embodiment is as a reference point using D points, in " suspension " of G
One fixed voltage V, makes CTL+-CTL- be consistently equal to V.Since the level of NMOS tube grid-control voltage reference is not entire
The GND of circuit, but determined by the circuit where NMOS tube.As shown in Fig. 2, add in transformation in NMOS tube control circuit
Device controls the pressure difference of NMOS tube G points and D points by controlling the presence or absence of transformer input voltage, this pressure difference by
Transformer secondary coil output after rectification by obtaining, as CTL+-CTL-=V, Q1, Q2, Q3, Q4 conducting, loud speaker, which plays, works as
The audio of preceding source of sound, conversely, as CTL+-CTL-=0, Q1, Q2, Q3, Q4 are in cut-off state, do not play the road audio, reach
Turn off the effect of loud speaker.
The present embodiment drives other problem solved is that the detection problem of power amplifier audio signal as shown in figure 3, power amplifier exports
A dynamic loud speaker needs two signal wires, respectively AUDIO+ and AUDIO-, and two signal wires of comparison are used in the present embodiment
Signal is done subtraction process by signal by subtracter, and by taking 1KHZ standard audio signals as an example, the 1 foot output of amplifier U1A is 1KHZ
Sine wave carries out blocking processing by capacitance C3, and diode D1, capacitance C4 carry out halfwave rectifier and obtain a DC level signal
AUDIO_MIX is input to the negative terminal of amplifier U1B.Amplifier U1B is used in the present embodiment as comparator, and anode presets one
A reference level Vref, Vref level can be adjusted by MCU control unit, by comparing AUDIO_MIX and Vref level
State obtains the value of AUDIO_DEC and sends MCU control unit to, and when Vref is higher than AUDIO_MIX, AUDIO_DEC is height
Level, it is on the contrary then for low level, MCU control unit is in this, as the foundation of switching sound source signal.
The workflow that entire multiple sound resource intelligently detects the audio switch of switching is as described below：After the power is turned at the beginning of carry out system
Beginningization, MCU control unit monitors whether source of sound 1 has voice input, such as voiceless sound in real time by detection module after the completion of initialization
Input, then close 1 channel of source of sound, opens the audio signal that 2 channel of source of sound plays source of sound 2, in playing process, detection module after
Whether continuous detection source of sound 1 has voice input, when detecting that source of sound 1 has voice input, closes 2 channel of source of sound, it is logical to open source of sound 1
Road starts to play the audio signal of source of sound 1, and MCU can detect whether 1 audio of source of sound finishes at this time, such as finish, and be delayed
1 channel of source of sound is closed after a period of time, the audio signal that 2 channel of source of sound plays source of sound 2 is opened, to ensure 1 voice signal of source of sound
The integrality of broadcasting.
Claims (3)
1. a kind of multiple sound resource audio switch that intelligently detecting switches, including audio switching unit, MCU control unit and detection
Module, it is characterized in that the audio switching unit is equipped with audio input and audio output interface, MCU control unit and audio
Switch unit connects, and detection module is connect with MCU control unit, and detection module is also connect with audio input.
2. the multiple sound resource according to claim 1 audio switch that intelligently detecting switches, it is characterized in that the audio is cut
It changes unit to include by NMOS tube, the switch electricity that AUDIOIN interfaces, AUDIOOUT interfaces, CTRL+ interfaces and CTRL- interfaces form
Road, two NMOS tubes of symmetrically connecting between the AUDIOIN interfaces and AUDIOOUT interfaces, the G feet of two NMOS tubes are equal
CTRL+ interfaces are connected, CTRL- interfaces are connected between two NMOS tubes, are had between CTRL+ and CTRL- by transformer input
Voltage V.
3. the multiple sound resource according to claim 1 audio switch that intelligently detecting switches, it is characterized in that the detection mould
Block includes amplifier U1A and amplifier U1B, and amplifier U1A input terminals connect two signal wires of audio, and the output terminal of amplifier U1A passes through
Half-wave rectifying circuit is connected to the input terminal of amplifier U1B, another input terminal connection reference level Vref of amplifier U1B, amplifier
The output terminal of U1B is connected to MCU control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721903482.7U CN207589159U (en) | 2017-12-29 | 2017-12-29 | The multiple sound resource audio switch that intelligently detecting switches |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721903482.7U CN207589159U (en) | 2017-12-29 | 2017-12-29 | The multiple sound resource audio switch that intelligently detecting switches |
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| Publication Number | Publication Date |
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| CN207589159U true CN207589159U (en) | 2018-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721903482.7U Active CN207589159U (en) | 2017-12-29 | 2017-12-29 | The multiple sound resource audio switch that intelligently detecting switches |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107979795A (en) * | 2017-12-29 | 2018-05-01 | 数源科技股份有限公司 | The multiple sound resource audio switch that intelligently detecting switches |
| CN114567848A (en) * | 2022-01-26 | 2022-05-31 | 惠州华阳通用电子有限公司 | Audio output channel state detection device and method |
-
2017
- 2017-12-29 CN CN201721903482.7U patent/CN207589159U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107979795A (en) * | 2017-12-29 | 2018-05-01 | 数源科技股份有限公司 | The multiple sound resource audio switch that intelligently detecting switches |
| CN114567848A (en) * | 2022-01-26 | 2022-05-31 | 惠州华阳通用电子有限公司 | Audio output channel state detection device and method |
| CN114567848B (en) * | 2022-01-26 | 2024-05-07 | 惠州华阳通用电子有限公司 | Audio output channel state detection device and method |
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