CN101111095A - Sound frequency directional loudspeaker system based on consumer electronic equipments - Google Patents
Sound frequency directional loudspeaker system based on consumer electronic equipments Download PDFInfo
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- CN101111095A CN101111095A CNA2007100495057A CN200710049505A CN101111095A CN 101111095 A CN101111095 A CN 101111095A CN A2007100495057 A CNA2007100495057 A CN A2007100495057A CN 200710049505 A CN200710049505 A CN 200710049505A CN 101111095 A CN101111095 A CN 101111095A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The present invention relates to an audio frequency orientation system based on the consume electronic equipments, which comprises an A/D analog-to-digital converter, a digital signal modulation module, a power amplifier, a load matching network and an audio frequency orientation transducer, wherein the A/D analog-to-digital converter is used to receive the simulation audio frequency signals generated by electronic equipment chips, and to sample and output digit signals. The signals after being sampled makes an algorithm modulation processing through the digital signal modulation module, and makes the specific way described by the algorithm loaded to the ultrasonic wave. The power amplifier is used to receive the modulated signals and amplifies the power with high efficiency, if a simulation power amplifier amplifies the power, a D/A digital-to-analog converter is needed before the power is amplified. The load matching network is used to make the output maximum power of the power amplifier loaded on the load of a transducer. The audio frequency orientation transducer is used to make a directional transmission for listeners, and parts of the supersonic frequency band are converted into original audio frequency signals through being automatically demodulated by air. Because the ultrasonic wave has the directivity, the audible audio frequency demodulated from the interior of the ultrasonic wave also has the directivity and forms a directional audible sound.
Description
Technical field
The present invention relates to a kind of audio-frequency directional loudspeaker system that is used for consumer-elcetronics devices, it comprises signal processing system, and three major parts of power amplifier and directional transducer belong to signal processing field and speaker system field.
Background technology
The audio frequency directional system is a kind of a kind of New-type loudspeaker system that utilizes the aerial nonlinear propagation effects of ultrasonic wave to produce the high directivity audible sound.Audio signal forms the ultrasonic signal that contains this audio signal information after treatment, audible device by audio directional loudspeaker---transducer is transmitted into this ultrasonic wave in the air, this ultrasonic wave can demodulate the audio signal that wherein contains certainly in air then, forms one and has the very audio signal of highly directive.
In the modern society, mobile phone, media player, portable DVD player/VCD, notebook computer consumer-elcetronics devices are very ripe and almost reached individualized, yet all now consumer-elcetronics devicess, aspect audio signal output, adopted traditional diffusion type loud speaker always, this makes that these equipment must wearing headphones when the individual uses, otherwise the sound that is sent will influence other people or reveal personal information, does not have confidentiality.Particularly mobile phone etc. must lean on people's ear and loud speaker very near in use, thereby makes the user very inconvenient in use, damages the hidden danger of people's ear in addition.It is therefore, a kind of that to have directive property, that private audio-visual space can be provided, as to propagate longer-distance sonification system research be valuable.Current, the directional loudspeaker system that is used for common occasion is in the research and development state, yet, also there is not a kind of audio directional loudspeaker to come out based on consumer-elcetronics devices.
Summary of the invention
The purpose of this invention is to provide a kind of audio-frequency directional loudspeaker system based on consumer-elcetronics devices, so that the user has independently audio-visual space, assurance equipment in use personal information is not leaked or is not influenced other people, and more comfortable mode of operation easily is provided.
Purpose of the present invention is changed three parts and is realized by signal processing, signal power amplification, electroacoustic.Signal processing can be that hardware platform designs with DSP or FPGA, and purpose is to finish the preliminary treatment of desired output signal---comprise filtering and distortion compensation, and after signal carried out analog-to-digital conversion, loading algorithm was modulated to signal.Power amplifying part mainly be high efficiency, high power finish the power amplification of signal, and solve the output impedance matching problem with back grade ultrasonic transducer.Electroacoustic conversion is promptly by ultrasonic transducer, thereby the signal loading after finishing dealing with is launched directional ultrasonic on it, demodulates directed audio frequency with this.
For realizing above purpose, A/D converter in this system and digital signal modulation module all must be according to desired audio quality and algorithm modulated carriers, the model of selecting for use disposal ability to be fit to.
Can promote heating loss on it greatly because the ultrasonic transducer impedance is reactive, produce bigger acoustic pressure, finish ultrasonic wave more efficiently and launch.Therefore, the transducer manufacturing materials of selecting for use can be piezoelectric---comprise piezoelectric ceramic, PZT, pvdf membrane, also can be magnetostriction or other piezoelectrics.In a specific embodiment of the present invention, select the material of the silver-plated film of PVDF for use as transducer.
Because load is capacitive character, therefore in the design of power amplifier, impedance matching is particularly important, be not good at if handle, load will be similar to short circuit under the driving of high-frequency signal, can cause the airplane crash consequence of burning components and parts and transducer, in one embodiment of the invention, can utilize inductance, LC loop, transformer to carry out impedance conversion and coupling.Consider the needed high power of capacitive load, reach minimum in order to make the loss of power amplifier self-heating, it is the highest that efficient reaches, and the power amplifier of this system is selected the switching mode digital power amplifier for use, as D class, E class, F class, T class etc.In one embodiment of the invention, select for use the D power-like amplifier to carry out the system integration as design object.
Description of drawings
Fig. 1 shows the functional sequence block diagram of the audio frequency directional system that places the handset processes chip exterior.
Fig. 2 shows the functional sequence block diagram of the audio frequency directional system that is embedded in the handset processes chip internal.
1. mobile phone signal process chip among the figure, 2. audio frequency directional system, 3.A/D analog to digital converter, 4. digital signal modulation module, 5.D power-like amplifier, 6. load matching network, 7. audio directional loudspeaker.
Embodiment
Fig. 1 shows the designed embodiment who is independent of the audio frequency directional system of handset processes chip exterior according to the present invention.As seen from the figure, after receiving radio signal, antenna for mobile phone directly is transferred to the signal processing chip 1 of mobile phone inside, this chip is through filtering, extract the audio signal that is included in the radio modulation signal after the processing such as down-conversion, and be converted into the A/D converter 3 that analog signal outputs to audio frequency directional system 2, after 3 samplings, the gained digital signal is directly delivered to can be by the digital signal modulation module 4 of DSP or FPGA realization, after process D power-like amplifier 5 amplifies again by the signal after 4 modulation, by load matching network 6, be loaded into and drive its vibration emission ultrasonic wave on the audio directional loudspeaker 7.
Fig. 2 shows according to designed another of the present invention and is embedded in the embodiment of the audio frequency directional system of handset processes chip internal.The receiving course of radio signal is identical with embodiment 1 among Fig. 1, in this embodiment, the signal processing of audio frequency directional system and amplifier section have been integrated in the mobile phone signal process chip, can reduce the processed link of signal like this, have strengthened real-time and reliability.Moreover, because the signal processing chip of mobile phone all adopts the mode of Digital Signal Processing now, this makes signal more convenient with being connected of audio frequency directional system, A/D converter 3 also can omit need not, reduce the cost of integrated components and parts, also eliminated the distortion introduced of signal in the A/D transfer process.Under the situation that each device all satisfies, this mode that audio frequency directional system 2 is embedded into chip for cell phone 1 inside can reach and reduce volume, the effect that reduces cost.
Claims (10)
1. audio frequency directional system that is used for consumer-elcetronics devices is characterized in that this system comprises:
One A/D converter is to receive simulated audio signal and the sampling output digital signal that chip for cell phone was generated.If the signal that this system received has been sampled as digital signal, then A/D converter can omit.
One digital signal modulation module carries out the algorithm modulation treatment with the signal after the sampling, and it is loaded into ultrasonic wave with the described ad hoc fashion of algorithm.
One power amplifier, be used to receive modulated signal and with its power to amplify expeditiously.
One D/A converter is so that modulated digital signal is converted to analog signal input simulated power amplifier.If the employing digital power amplifier, then D/A converter can omit.
One load matching network, with so that the Maximum Power Output of power amplifier be loaded in the transducer load.
One audio directional transducer is given those who answer with the directional transmissions ultrasonic wave, and wherein this supersonic range part is reduced to former audio signal through air from demodulation.
2. audio frequency directional as claimed in claim 1 system is characterized in that, is used to launch hyperacoustic directional ultrasound energy converter, can be made of several array transmitter units, also can as a whole independently transducer.
3. audio frequency directional as claimed in claim 1 system is characterized in that the digital signal modulation module compensates distorted signals.
4. audio frequency directional as claimed in claim 1 system is characterized in that the digital signal modulation module is loaded into supersonic band with signal in the described mode of algorithm.
5. audio frequency directional as claimed in claim 1 system is characterized in that power amplifier can be the digital switch amplifier, comprises D class, E class, F class, T class or other digital power amplifiers.
6. audio frequency directional as claimed in claim 1 system is characterized in that, the signal transition after the digital signal modulation module will be modulated is two condition or ternary switching regulator signal.
7. audio frequency directional as claimed in claim 1 system is characterized in that, receives modulated signal and its power efficient ground switching regulator is amplified with digital power amplifier.
8. audio frequency directional as claimed in claim 1 system is characterized in that, carries out linear amplification with the analog signal that simulated power amplifier receives after the modulated.
9. audio frequency directional as claimed in claim 1 system is characterized in that, digital power amplifier is connected with transducer to guarantee high efficiency, powerful output by load matching network.
10. audio frequency directional as claimed in claim 1 system is characterized in that, this system can be used for any electronic equipment that audio frequency output is arranged such as mobile phone, media player, portable DVD player/VCD, notebook computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100495057A CN101111095A (en) | 2007-07-12 | 2007-07-12 | Sound frequency directional loudspeaker system based on consumer electronic equipments |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100495057A CN101111095A (en) | 2007-07-12 | 2007-07-12 | Sound frequency directional loudspeaker system based on consumer electronic equipments |
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| CN101111095A true CN101111095A (en) | 2008-01-23 |
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| CNA2007100495057A Pending CN101111095A (en) | 2007-07-12 | 2007-07-12 | Sound frequency directional loudspeaker system based on consumer electronic equipments |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098608A (en) * | 2010-12-13 | 2011-06-15 | 瑞声声学科技(深圳)有限公司 | Parametric acoustic array audio playback system and modulation method thereof |
| WO2016123901A1 (en) * | 2015-02-03 | 2016-08-11 | 中兴通讯股份有限公司 | Terminal and method for directionally playing audio signal thereby |
| WO2017045371A1 (en) * | 2015-09-15 | 2017-03-23 | 石姗姗 | Smart wearable device having directional sound emission function |
| CN106937206A (en) * | 2017-05-09 | 2017-07-07 | 成都泰声科技有限公司 | A kind of mobile phone screen orients sonification system |
| CN106973349A (en) * | 2017-05-24 | 2017-07-21 | 广东小天才科技有限公司 | Directional loudspeaker control method, directional loudspeaker control device and intelligent terminal |
| CN109361991A (en) * | 2018-12-13 | 2019-02-19 | 山东大学 | A kind of more scene directional sound systems and its operation method based on DSP platform |
| CN110070709A (en) * | 2019-05-29 | 2019-07-30 | 杭州聚声科技有限公司 | A kind of pedestrian's street crossing orientation speech prompting system and its method |
| CN110870329A (en) * | 2017-07-19 | 2020-03-06 | 株式会社索思未来 | Sound processing device and sound output device |
-
2007
- 2007-07-12 CN CNA2007100495057A patent/CN101111095A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098608A (en) * | 2010-12-13 | 2011-06-15 | 瑞声声学科技(深圳)有限公司 | Parametric acoustic array audio playback system and modulation method thereof |
| CN102098608B (en) * | 2010-12-13 | 2014-03-05 | 瑞声声学科技(深圳)有限公司 | Parametric acoustic array audio playback system and modulation method thereof |
| WO2016123901A1 (en) * | 2015-02-03 | 2016-08-11 | 中兴通讯股份有限公司 | Terminal and method for directionally playing audio signal thereby |
| WO2017045371A1 (en) * | 2015-09-15 | 2017-03-23 | 石姗姗 | Smart wearable device having directional sound emission function |
| CN106937206A (en) * | 2017-05-09 | 2017-07-07 | 成都泰声科技有限公司 | A kind of mobile phone screen orients sonification system |
| CN106973349A (en) * | 2017-05-24 | 2017-07-21 | 广东小天才科技有限公司 | Directional loudspeaker control method, directional loudspeaker control device and intelligent terminal |
| CN110870329A (en) * | 2017-07-19 | 2020-03-06 | 株式会社索思未来 | Sound processing device and sound output device |
| CN109361991A (en) * | 2018-12-13 | 2019-02-19 | 山东大学 | A kind of more scene directional sound systems and its operation method based on DSP platform |
| CN110070709A (en) * | 2019-05-29 | 2019-07-30 | 杭州聚声科技有限公司 | A kind of pedestrian's street crossing orientation speech prompting system and its method |
| CN110070709B (en) * | 2019-05-29 | 2023-10-27 | 杭州聚声科技有限公司 | Pedestrian crossing directional voice prompt system and method thereof |
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Open date: 20080123 |