CN205754821U - Interactive teaching and learning recorded broadcast audio process - Google Patents
Interactive teaching and learning recorded broadcast audio process Download PDFInfo
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- CN205754821U CN205754821U CN201620710814.9U CN201620710814U CN205754821U CN 205754821 U CN205754821 U CN 205754821U CN 201620710814 U CN201620710814 U CN 201620710814U CN 205754821 U CN205754821 U CN 205754821U
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- analogue signal
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- processes
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Abstract
The utility model discloses a kind of interactive teaching and learning recorded broadcast audio process, process circuit, control circuit, volume control circuit, frequency shift circuit and output processing circuit including prime；Prime processes circuit for the audio electrical signal received is amplified Filtering Processing to produce the first analogue signal；Control circuit processes circuit with prime and is connected, for detecting the intensity of the first analogue signal to produce volume control signal；Volume control circuit processes circuit with prime and control circuit is connected, for regulating the intensity of the first analogue signal to produce the second analogue signal according to volume control signal；Frequency shift circuit is connected with volume control circuit, processes for the second analogue signal carries out shift frequency to produce the 3rd analogue signal；Output processing circuit is connected with frequency shift circuit, for the 3rd analogue signal being amplified Filtering Processing and being converted to single-ended and two kinds of outputs of balance.This utility model processes elimination by shift frequency and utters long and high-pitched sounds, it is not necessary to the biggest memory space.
Description
Technical field
This utility model relates to audio signal processing technique field, is specifically related to a kind of interactive teaching and learning recorded broadcast audio process.
Background technology
In instant communication applications, need to carry out both sides or the exchange of real-time voice in many ways.Requiring higher occasion,
It is the most all to use external voice box playback, so will necessarily produce echo, after i.e. one side speaks, by the audio amplifier playback of the other side,
Collected by the microphone of the other side the most again and return to oneself.If echo is not processed, it will affect speech quality and use
Family is experienced, and more serious also can form concussion, and generation is uttered long and high-pitched sounds.Echo cancellor is exactly after microphone collects sound, by this locality
The sound that audio amplifier plays back eliminates from the voice data of microphone collection so that the sound that microphone is recorded only has local user
One's voice in speech.
Echo cancelling device of the prior art, is with the dependency of loudspeaker signal with the multipath echo produced by it
Based on set up the speech model of remote signaling, utilize it that echo is estimated and constantly revise the coefficient of wave filter so that
The echo of estimated value more approaching to reality.Finally echo estimated value is deducted from the input signal of microphone, thus reach to eliminate
The purpose of echo.Although the signal processing theory algorithm that the hardware chip technology maked rapid progress makes many be sunk into sleep on textbook is big
Sizable application, but the stock number that existing echo cancelling device needs must be surprising or big.As a example by video conferencing system, greatly
The meeting room of scale can produce the echo more than 512ms, will eliminate the echo of so long delay, even if according to 8kHz sample rate
Calculating, the length of sef-adapting filter all can reach 4096 points, so needs the biggest memory space to store certainly
Adaptive filter, thus existing echo cancelling device cannot be applied in interactive teaching and learning recorded broadcast Audio Processing.
Utility model content
To be solved in the utility model is that memory space is big needed for existing echo cancelling device, cannot be applied to teaching
Problem in interactive recorded broadcast Audio Processing.
This utility model is achieved through the following technical solutions:
A kind of interactive teaching and learning recorded broadcast audio process, processes circuit, control circuit, volume control circuit, shifting including prime
Frequency circuit and output processing circuit；Described prime processes circuit and is connected with external speaker, for the audio electrical signal received
It is amplified Filtering Processing to produce the first analogue signal；Described control circuit processes circuit with described prime and is connected, and is used for examining
Survey the intensity of described first analogue signal to produce volume control signal；Described volume control circuit processes circuit with described prime
Connect with described control circuit, for regulating the intensity of described first analogue signal according to described volume control signal to produce the
Two analogue signals；Described frequency shift circuit is connected with described volume control circuit, for described second analogue signal is carried out shift frequency
Process to produce the 3rd analogue signal；Described output processing circuit is connected with described frequency shift circuit, for described 3rd simulation
Signal is amplified Filtering Processing and is converted to single-ended and two kinds of outputs of balance.
The reason that power amplifier echogenicity is uttered long and high-pitched sounds is that the sound played out due to sound equipment again will by pick up facilities such as mikes
The acoustical signal of sound equipment sends power amplifying device back to, due to the acoustical signal returned and the acoustical signal play before with frequency in the same direction, because of
This is easy to produce voice technique while power amplifier carries out signal amplification, causes the excessive generation of amplitude output signal to be uttered long and high-pitched sounds.
The interactive teaching and learning recorded broadcast audio process that this utility model provides, is moved by the analogue signal exporting volume control circuit
Frequency processes, and makes the acoustical signal all the time returned and the acoustical signal play before it is unlikely that with situation the most in the same direction,
Avoid amplitude output signal excessive, thus eliminate and utter long and high-pitched sounds.Different from echo cancelling device of the prior art, this utility model
It is to process elimination by shift frequency to utter long and high-pitched sounds, because of without the biggest memory space.
Optionally, described interactive teaching and learning recorded broadcast audio process also includes the indicating circuit being connected with described control circuit；
Described control circuit is additionally operable to produce instruction control signal when the intensity of described first analogue signal is zero detecting；Described finger
Show that circuit carries out luminous instruction under the control of described instruction control signal.By arranging described indicating circuit, it is simple to intuitively look into
See whether external speaker inputs without audio electrical signal.
Optionally, described instruction control signal is low level signal, and described indicating circuit includes current-limiting resistance and luminous two
Pole is managed；One end of described current-limiting resistance receives described instruction control signal, and the other end of described current-limiting resistance connects described luminescence
The negative electrode of diode, the anode of described light emitting diode receives supply voltage.
Optionally, described prime processes the RC4558D integrated circuit that circuit is Texas Instrument.
Optionally, described control circuit is the STC12C5A08AD integrated circuit of macrocrystalline science and technology.
Optionally, described volume control circuit is the PT2258 integrated circuit of U.S. parameters technology company.
Optionally, described frequency shift circuit includes that DSP module and the power module, the crystal that are connected with described DSP module shake
Swing module, SRAM and FLASH；Described power module for powering to described DSP module, described crystal oscillation module for
Described DSP module provides work clock, and described DSP module is for being converted to digital signal and to institute by described second analogue signal
State digital signal and carry out shift frequency process, then the digital signal after carrying out shift frequency process is converted to described 3rd analogue signal.
Optionally, described DSP module is the JZ4725B integrated circuit that Beijing monarch is positive.
This utility model compared with prior art, has such advantages as and beneficial effect:
The interactive teaching and learning recorded broadcast audio process that this utility model provides, is believed by the simulation exporting volume control circuit
Number carry out shift frequency process, it is possible to suppress noise well, eliminate echo, improve speech intelligibility, stable and reliable working performance, and
Need not the biggest memory space, it is possible to the pickup distance of common microphone is brought up to 2.5 meters to 5 meters.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing being further appreciated by this utility model embodiment, constitutes the one of the application
Part, is not intended that the restriction to this utility model embodiment.In the accompanying drawings:
Fig. 1 is the structural representation of the interactive teaching and learning recorded broadcast audio process of this utility model embodiment；
Fig. 2 is that the prime of this utility model embodiment processes circuit, control circuit, volume control circuit and indicating circuit
Circuit diagram；
Fig. 3 is the structural representation of the frequency shift circuit of this utility model embodiment.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with embodiment and accompanying drawing,
The utility model is described in further detail, and exemplary embodiment of the present utility model and explanation thereof are only used for explaining this
Utility model, is not intended as restriction of the present utility model.
Embodiment
Fig. 1 is the structural representation of the interactive teaching and learning recorded broadcast audio process of this utility model embodiment, and described teaching is mutual
Dynamic recorded broadcast audio process includes that prime processes circuit 11, control circuit 15, volume control circuit 12, frequency shift circuit 13 and defeated
Go out to process circuit 14.
Specifically, described prime processes circuit 11 and is connected with external speaker, for receiving the audio-frequency electric that external speaker transmits
Signal, and the audio electrical signal received is amplified Filtering Processing to produce the first analogue signal.Described control circuit 15 with
Described prime processes circuit 11 and connects, for detecting the intensity of described first analogue signal, and according to described first analogue signal
Intensity produce volume control signal, described volume control signal is used for controlling described volume control circuit 12 to described first mould
Intend signal to decay.Described volume control circuit 12 processes circuit 11 with described prime and described control circuit 15 is connected, and uses
In regulating the intensity of described first analogue signal according to described volume control signal to produce the second analogue signal.Further, institute
Stating control circuit 15 and detect that the intensity of described first analogue signal is the strongest, described volume control signal controls described volume adjusting
Described first analogue signal is decayed the most by circuit 12.Described frequency shift circuit 13 is connected with described volume control circuit 12, uses
Process in described second analogue signal being carried out shift frequency to produce the 3rd analogue signal.Described second analogue signal is carried out shift frequency
Process, the frequency of described second analogue signal can be moved backward, it is also possible to by the frequency of described second analogue signal toward reach,
The frequency variation of movement can be configured according to the actual requirements, and this is not construed as limiting by this utility model.Described output processes electricity
Road 14 is connected with described frequency shift circuit 13, for described 3rd analogue signal is amplified Filtering Processing and be converted to single-ended and
Balance two kinds of outputs.Those skilled in the art know how described 3rd analogue signal is amplified Filtering Processing and is converted to
Single-ended and balance two kinds of outputs, do not repeat them here.
In the present embodiment, described interactive teaching and learning recorded broadcast audio process also includes the finger being connected with described control circuit 15
Show circuit 16.Described control circuit 15 is additionally operable to detecting that producing instruction when the intensity of described first analogue signal is zero controls
Signal, described indicating circuit 16 carries out luminous instruction under the control of described instruction control signal.By arranging described instruction electricity
Road 16, can know whether external speaker inputs without audio electrical signal intuitively.
Fig. 2 is that the prime of this utility model embodiment processes circuit 11, control circuit 15, volume control circuit 12 and refers to
Show the circuit diagram of circuit 16.In the present embodiment, described prime processes the RC4558D integrated circuit that circuit 11 is Texas Instrument,
Described control circuit 15 is the STC12C5A08AD integrated circuit road of macrocrystalline science and technology, and described volume control circuit 12 is U.S. parameters
The PT2258 integrated circuit of technology company.Further, described instruction control signal is low level signal, and described indicating circuit 16 wraps
Include current-limiting resistance and light emitting diode.One end of described current-limiting resistance receives described instruction control signal, described current-limiting resistance
The other end connects the negative electrode of described light emitting diode, and the anode of described light emitting diode receives supply voltage.STC12C5A08AD
Integrated circuit provides clock signal by the SCL interface of PT2258 integrated circuit to PT2258 integrated circuit, by PT2258 collection
The SDL interface becoming circuit provides data signal, the most described volume control signal to PT2258 integrated circuit.Use
STC12C5A08AD integrated circuit detects the intensity of described first analogue signal, and produces according to the intensity of described first analogue signal
Raw volume control signal belongs to prior art, does not repeats them here.
Fig. 3 is the structural representation of the frequency shift circuit 13 of this utility model embodiment, and described frequency shift circuit 13 includes DSP mould
Block and the power module being connected with described DSP module, crystal oscillation module, SRAM and FLASH.Specifically, described power supply
5V voltage (is such as changed by module voltage needed for the voltage that external power source provides is converted to the work of described DSP module
For 3.3V voltage), power to described DSP module.Described crystal oscillation module uses crystal and capacitive tank, for described
DSP module provides work clock.Described DSP module is for being converted to digital signal and to described number by described second analogue signal
Word signal carries out shift frequency process, then the digital signal after carrying out shift frequency process is converted to described 3rd analogue signal.This area
Skilled person will understand that and how to use DSP module that one signal is carried out shift frequency process, not repeat them here.Further, described DSP
Module can be the JZ4725B integrated circuit that Beijing monarch is positive.
Above-described detailed description of the invention, is entered the purpose of this utility model, technical scheme and beneficial effect
One step describes in detail, be it should be understood that and the foregoing is only detailed description of the invention of the present utility model, is not used to limit
Fixed protection domain of the present utility model, all within spirit of the present utility model and principle, any amendment, the equivalent made are replaced
Change, improvement etc., within should be included in protection domain of the present utility model.
Claims (8)
1. an interactive teaching and learning recorded broadcast audio process, it is characterised in that include that prime processes circuit, control circuit, volume tune
Economize on electricity road, frequency shift circuit and output processing circuit；
Described prime processes circuit and is connected with external speaker, for the audio electrical signal received being amplified Filtering Processing to produce
Raw first analogue signal；
Described control circuit processes circuit with described prime and is connected, for detecting the intensity of described first analogue signal to produce sound
Amount control signal；
Described volume control circuit processes circuit with described prime and described control circuit is connected, for controlling according to described volume
The intensity of the first analogue signal described in Signal Regulation is to produce the second analogue signal；
Described frequency shift circuit is connected with described volume control circuit, processes to produce for described second analogue signal carries out shift frequency
Raw 3rd analogue signal；
Described output processing circuit is connected with described frequency shift circuit, for described 3rd analogue signal is amplified Filtering Processing
And be converted to single-ended and two kinds of outputs of balance.
Interactive teaching and learning recorded broadcast audio process the most according to claim 1, it is characterised in that also include controlling electricity with described
The indicating circuit that road connects；
Described control circuit is additionally operable to produce instruction control signal when the intensity of described first analogue signal is zero detecting；
Described indicating circuit carries out luminous instruction under the control of described instruction control signal.
Interactive teaching and learning recorded broadcast audio process the most according to claim 2, it is characterised in that described instruction control signal is
Low level signal, described indicating circuit includes current-limiting resistance and light emitting diode；
One end of described current-limiting resistance receives described instruction control signal, and the other end of described current-limiting resistance connects described luminous two
The negative electrode of pole pipe, the anode of described light emitting diode receives supply voltage.
Interactive teaching and learning recorded broadcast audio process the most according to claim 1, it is characterised in that described prime processes circuit and is
The RC4558D integrated circuit of Texas Instrument.
Interactive teaching and learning recorded broadcast audio process the most according to claim 1, it is characterised in that described control circuit is macrocrystalline
The STC12C5A08AD integrated circuit of science and technology.
Interactive teaching and learning recorded broadcast audio process the most according to claim 1, it is characterised in that described volume control circuit is
The PT2258 integrated circuit of U.S. parameters technology company.
Interactive teaching and learning recorded broadcast audio process the most according to claim 1, it is characterised in that described frequency shift circuit includes
DSP module and the power module being connected with described DSP module, crystal oscillation module, SRAM and FLASH；
Described power module is for powering to described DSP module, and described crystal oscillation module is for providing work to described DSP module
Making clock, described DSP module for being converted to digital signal and moving described digital signal by described second analogue signal
Frequency processes, then the digital signal after carrying out shift frequency process is converted to described 3rd analogue signal.
Interactive teaching and learning recorded broadcast audio process the most according to claim 7, it is characterised in that described DSP module is Beijing
The JZ4725B integrated circuit that monarch is positive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620710814.9U CN205754821U (en) | 2016-07-07 | 2016-07-07 | Interactive teaching and learning recorded broadcast audio process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620710814.9U CN205754821U (en) | 2016-07-07 | 2016-07-07 | Interactive teaching and learning recorded broadcast audio process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205754821U true CN205754821U (en) | 2016-11-30 |
Family
ID=57377523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620710814.9U Expired - Fee Related CN205754821U (en) | 2016-07-07 | 2016-07-07 | Interactive teaching and learning recorded broadcast audio process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205754821U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110650423A (en) * | 2019-10-18 | 2020-01-03 | 邹熠晨 | Intelligent classroom sound control system |
-
2016
- 2016-07-07 CN CN201620710814.9U patent/CN205754821U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110650423A (en) * | 2019-10-18 | 2020-01-03 | 邹熠晨 | Intelligent classroom sound control system |
| CN110650423B (en) * | 2019-10-18 | 2020-08-04 | 邹熠晨 | Intelligent classroom sound control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161130 Termination date: 20200707 |