CN206620294U - A kind of handheld terminal formula microphone system based on Bluetooth technology - Google Patents
A kind of handheld terminal formula microphone system based on Bluetooth technology Download PDFInfo
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- CN206620294U CN206620294U CN201720427331.2U CN201720427331U CN206620294U CN 206620294 U CN206620294 U CN 206620294U CN 201720427331 U CN201720427331 U CN 201720427331U CN 206620294 U CN206620294 U CN 206620294U
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- bluetooth module
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- bluetooth
- audio signal
- microphone system
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Abstract
The utility model discloses a kind of handheld terminal formula microphone system based on Bluetooth technology, it is related to multimedia play technology field, including intelligent hand-held terminal and multimedia play equipment, also include the first bluetooth module, the second bluetooth module and loudspeaker playing module, the audio pickup module being arranged in intelligent hand-held terminal is used to pick up audio signal；The audio signal that the first bluetooth module being arranged in intelligent hand-held terminal is used to pick up audio pickup module is sent to the second bluetooth module；The second bluetooth module for setting up data cube computation with the first bluetooth module is used to receive the audio signal from the first bluetooth module, and the audio signal is sent into loudspeaker playing module；The loudspeaker playing module being arranged in multimedia play equipment is used for playing audio signal.The utility model realizes the sound for picking up intelligent hand-held terminal and played in real time by speaker system, strong adaptability.
Description
Technical field
The utility model is related to multimedia play technology field, and in particular to a kind of handheld terminal formula based on Bluetooth technology
Microphone system.
Background technology
The microphone configured in existing multimedia play equipment generally requires the personnel for being equipped with special maintained equipment, and i.e.
Make so can also run into the problem of microphone is easily lost, damaged often, it is upper in the presence of greatly not convenient using.
In addition, sound reinforcement system of the tradition comprising microphone often produces the phenomenon uttered long and high-pitched sounds when in use, reason is sound quilt
The sound wave that microphone pickup is produced after then being played out by loudspeaker just forms echo by microphone pickup again, and returns
Sound is again introduced into speaker portion and is exaggerated, if self-excitation phenomena will repeatedly be produced by being repeated in the formation positive feedback of some frequencies
Form ear-piercing howling.Utter long and high-pitched sounds and destroy the stabilization of sound reinforcement system, even the damage of equipment can be caused when serious, so uttering long and high-pitched sounds
In sound reinforcement system be it is most troubling be but also the problem of most can't steer clear of.
Bluetooth is the short-distance wireless communication technology for replacing data cable, can support the communication between object and object,
Working frequency range is the 2.4GHz frequency ranges of global open, and data and voice transfer can be carried out simultaneously, and transmission rate can reach 10Mb/
S so that the various Informationization Equipments in the range of it can realize seamless resource-sharing.The good fit of Bluetooth technology be also
The interactive mode transformed between conventional microphone and loudspeaker provides new possibility.Nowadays, it is sound reinforcement system is whole with movement
End, which is used in combination, just turns into the main direction of studying in this area.Has plenty of the sound record for being picked up mobile phone terminal in the prior art
Interior carry out voice change process is being applied after getting off, is having plenty of and directly plays back the sound of pickup by mobile phone speaker, no
One and foot, but simultaneously Echo will can be handled very using be connected interaction with loudspeaker and carrying out real-time public address without a
It is good.
Chinese patent application CN106303118A discloses a kind of intelligent terminal and realizes that the method for microphone function, audio are broadcast
Method, equipment and system are put, including：Intelligent terminal sets up data cube computation with multimedia equipment；Near-end audio signal is gathered in real time；
Chauvent's criterion processing is carried out to near-end audio signal and obtains packets of audio data；Packets of audio data is sent to the multimedia and set
It is standby, the packets of audio data is exported by multimedia equipment.The utility model also provides a kind of audio frequency playing method, intelligence eventually simultaneously
The equipment and system of microphone function are realized in end, can be realized by intelligent terminals such as smart mobile phone, the tablet personal computers more popularized
The function of microphone；There is chauvent's criterion function and digital effecter function simultaneously.It the patent application disclose intelligent terminal
As the general framework of microphone, the overall performance of system has much room for improvement, and many multimedia equipments do not have in the prior art
The standby software/hardware basis that data cube computation is carried out with intelligent terminal.
Utility model content
In view of the shortcomings of the prior art, the purpose of this utility model aims to provide a kind of handheld terminal based on Bluetooth technology
Formula microphone system, realizes that the sound for picking up intelligent hand-held terminal is played out by speaker system, it is adaptable in lacking
Put the multimedia play equipment of bluetooth module.
To achieve the above object, the utility model is adopted the following technical scheme that：
A kind of handheld terminal formula microphone system based on Bluetooth technology, including possess the intelligent handhold of pickup audio-frequency function
Terminal and multimedia play equipment, in addition to the first bluetooth module, the second bluetooth module and loudspeaker playing module, wherein first
Bluetooth module is built in intelligent hand-held terminal, and the loudspeaker playing module is built in multimedia play equipment.
As a kind of improvement of the present utility model, the second bluetooth module is built in multimedia play equipment.
As another improvement of the present utility model, the second bluetooth module is placed on multimedia play equipment, the second bluetooth
Module include successively signal connection antenna, high-frequency amplifier, frequency mixer, intermediate frequency amplifier, frequency discriminator and preamplifier and
Power amplifier, frequency mixer is also connected with local oscillator signal.
As a kind of improvement of the present utility model, intermediate frequency amplifier includes one-level intermediate frequency amplifier, two grades of intermediate frequency amplifiers
With three-level intermediate frequency amplifier.
As a kind of improvement of the present utility model, local oscillator uses quartz oscillator.
The beneficial effects of the utility model are：Intelligent hand-held terminal is set multimedia by Bluetooth transfer techniques
It is standby to connect, it is easy to regard intelligent hand-held terminal as pickup terminal and playback equipment knot with good fit Bluetooth technology
Conjunction is used, and Bluetooth transfer techniques have ensured sensitivity and the stability of audio transmission；It can be connected by external Bluetooth Receiver
Multimedia play equipment and handheld terminal, make system be applied to the multimedia play equipment without built Bluetooth module, improve
The applicability of the system, expand the scope promoted the use of.
Brief description of the drawings
Fig. 1 is a kind of structured flowchart of the handheld terminal formula microphone system based on Bluetooth technology of the utility model；
Fig. 2 is the structured flowchart of the second bluetooth module in the utility model.
Embodiment
Below, with reference to accompanying drawing and embodiment, the utility model is described further：
Embodiment 1
As shown in figure 1, a kind of handheld terminal formula microphone system based on Bluetooth technology, including intelligent hand-held terminal and many
Apparatus for media playing, intelligent hand-held terminal is built-in with audio pickup module, data buffering module, the first bluetooth module and self-excitation and returned
Sound cancellation module, multimedia play equipment is built-in with the second bluetooth module and loudspeaker playing module, intelligent hand-held terminal with it is many
Apparatus for media playing is set up through the first bluetooth module and the second bluetooth module and connects and carry out data transmission；
In intelligent hand-held terminal, audio pickup module is delayed for picking up audio signal, and audio signal being sent into data
In die block；Multiple audio queue buffering areas for having and setting cushion space, data buffering mould are provided with data buffering module
Block is used to be stored audio signal into audio queue buffering area according to the reception time, and each audio queue buffering area is used to management
The form and transmitting path of audio signal, the audio signal from audio pickup module are sent to each audio queue buffering area, made
The audio signal quantity convergence state of equalization in each audio queue buffering area is obtained, data buffering module is receiving setting length
It is sent to after audio signal, sequentially by audio signal through the first bluetooth module in the second bluetooth module；Second bluetooth module is in the future
Loudspeaker playing module is sent to from the audio signal of the first bluetooth module, loudspeaker playing module is decoded to audio signal
And broadcasting；Self-excitation echo cancellation module is using NLMS (normalization minimum mean-square adaptive algorithm) to from loudspeaker playing module
The audio signal played out carries out echo cancellation process, so as to avoid producing self-excitation phenomena impair result of broadcast, self-excitation echo disappears
Except sef-adapting filter is included in module, have by the way of NLMS (normalization minimum mean-square adaptive algorithm) eliminates echo
Body is：If remote signaling is x (n), near end signal is d (n), and filter coefficient is W (n), then error signal is：E (n)=d
(n)-W'(n) * x (n), wherein W'(n) order is turned by W (n) formed, filter coefficient is updated using the method for variable step, is walked
Long u=uo/ (gamma+x'(n) * x (n)), wherein uoTo update step factor, gamma is stable factor, x'(n) turned by x (n)
Order is formed, then filter coefficient update equation is：W (n+1)=W (n)+u*e (n) * x (n)；Self-excitation echo cancellation module is additionally operable to
The transmission function of wave filter is calculated using NLP (nonlinear filtering algorithm)：H (w)=Ps (w)/(Ps (w)+Pn (w)), wherein
Ps (w) is the power spectrum of the voice signal of estimation, and Pn (w) is the power spectrum of noise signal.
Audio pickup module, data buffering module and self-excitation echo cancellation module in intelligent hand-held terminal is through OC/Java
Language is developed, and is set up using frameworks such as AVFoundation, CoreAudio and AudioToolbox, it is adaptable to no
Same intelligent hand-held terminal operating system.
Embodiment 2
The microphone system that the present embodiment is provided is based on the microphone system in embodiment 1, in the present embodiment, multimedia
There is no the second built-in bluetooth module in playback equipment, multimedia play equipment is connected with the second external bluetooth module signal.
As shown in Fig. 2 second bluetooth module include successively signal connection antenna, high-frequency amplifier (height is put), frequency mixer (mixing),
Intermediate frequency amplifier (intermediate frequency), frequency discriminator (frequency discrimination) and preamplifier (preposition amplification) and power amplifier (power amplifier), wherein, in
Audio amplifier includes one-level intermediate frequency amplifier, two grades of intermediate frequency amplifiers and three-level intermediate frequency amplifier, and frequency mixer is also with being used as the machine
The quartz oscillator signal connection of oscillator (local oscillator)；In the second bluetooth module：
Antenna is used for the audio signal of reception space medium-high frequency and the audio signal of the high frequency is sent into high-frequency amplifier
In be amplified, the high-frequency audio signal after amplification is sent in frequency mixer by high-frequency amplifier；Quartz oscillator is produced
Frequency range is higher than the machine carrier signal of high-frequency audio signal, and the machine carrier signal is sent in frequency mixer, and frequency mixer is to this
Machine carrier signal and the audio signal of high frequency are differed and export the audio signal of intermediate frequency；Intermediate frequency amplifier and frequency discriminator point
The other audio signal to intermediate frequency is amplified and demodulated, and wherein the audio signal of mode of frequency regulation is converted into amplitude modulation side by frequency discriminator
The audio signal of formula；Preamplifier is further amplified to audio signal to meet the requirement of next level work, in
The power amplifier of two bluetooth module end working positions is amplified the energy of audio signal, treats that the voltage of audio signal reaches
After 0-4dB level, it is sent to loudspeaker playing module.
It will be apparent to those skilled in the art that technical scheme that can be as described above and design, make other various
It is corresponding to change and deformation, and all these change and deformation should all belong to the protection of the utility model claim
Within the scope of.
Claims (5)
1. a kind of handheld terminal formula microphone system based on Bluetooth technology, including possess the intelligent handhold end of pickup audio-frequency function
End and multimedia play equipment, it is characterised in that also play mould including the first bluetooth module, the second bluetooth module and loudspeaker
Block, wherein the first bluetooth module is built in intelligent hand-held terminal, the loudspeaker playing module is built in multimedia and set
In standby.
2. microphone system as claimed in claim 1, it is characterised in that second bluetooth module is built in multimedia
In equipment.
3. microphone system as claimed in claim 1, it is characterised in that second bluetooth module is placed on multimedia
Equipment, the second bluetooth module include successively signal connection antenna, high-frequency amplifier, frequency mixer, intermediate frequency amplifier, frequency discriminator and
Preamplifier and power amplifier, frequency mixer are also connected with local oscillator signal.
4. microphone system as claimed in claim 3, it is characterised in that the intermediate frequency amplifier amplifies including one-level intermediate frequency
Device, two grades of intermediate frequency amplifiers and three-level intermediate frequency amplifier.
5. microphone system as claimed in claim 3, it is characterised in that the local oscillator is vibrated using quartz crystal
Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720427331.2U CN206620294U (en) | 2017-04-22 | 2017-04-22 | A kind of handheld terminal formula microphone system based on Bluetooth technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720427331.2U CN206620294U (en) | 2017-04-22 | 2017-04-22 | A kind of handheld terminal formula microphone system based on Bluetooth technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206620294U true CN206620294U (en) | 2017-11-07 |
Family
ID=60223942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720427331.2U Active CN206620294U (en) | 2017-04-22 | 2017-04-22 | A kind of handheld terminal formula microphone system based on Bluetooth technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206620294U (en) |
-
2017
- 2017-04-22 CN CN201720427331.2U patent/CN206620294U/en active Active
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