CN201146501Y - Digital cordless microphone - Google Patents
Digital cordless microphone Download PDFInfo
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- CN201146501Y CN201146501Y CNU2007200809473U CN200720080947U CN201146501Y CN 201146501 Y CN201146501 Y CN 201146501Y CN U2007200809473 U CNU2007200809473 U CN U2007200809473U CN 200720080947 U CN200720080947 U CN 200720080947U CN 201146501 Y CN201146501 Y CN 201146501Y
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Abstract
The utility model provides a digital wireless microphone. A transmitting terminal converts a picked sound signal into an audio packet with an only address code by a sampling-coding circuit and then sends the packet to a receiving end. The receiving end receives the audio packet with the only address code and sends the packet to a digital decoding circuit. The only address code in the audio packet is compared with a preset address code of the receiving end, if matching, the audio packet decodes and reduces a simulated audio signal; if not matching, and then the audio packet can not be received. As the address codes of every set of digital wireless microphone are different, the address code is added to the audio packet at the transmitting terminal, the receiving end only accepts the audio packet matching with the address code. On occasions where large numbers of wireless microphones are used, for example, teaching buildings where classrooms are dense, even hundreds of classrooms use wireless microphones for teaching simultaneously, crosstalk can not happen. At the same time, the transmission of audio signals adopts digital transmission, so the anti-interference ability also is enhanced.
Description
Technical field
The utility model belongs to wireless communication technology field, specifically relates to a kind of digital cordless microphone.
Background technology
Present widely used wireless microphone, to superfrequency (VHF-UHF), its transmitting terminal and receiving terminal be high frequency analog signals all in very high frequency(VHF) for its operating frequency.The method that its operating frequency produces has 3 kinds: 1, RC oscillating circuit, 2, crystal oscillating circuit, 3, quartzy phase-locked loop frequency combiner circuit.No matter which kind of circuit, their the generation end and the operating frequency of receiving terminal are all fixed, and the user can not change voluntarily.If in same compact zone, when using some wireless microphones such as classroom building is a large amount of, just co-channel interference might occur like this, the form of expression is exactly a cross-talk.For avoiding interference, just need the wireless microphone of the many covers of configuration different frequency to use, but at the frequency that the wireless microphone of analog signal can provide is again limited at interval, on the market is that a frequency is more common at interval with 200K usually, such situation, need a large amount of wireless microphones that use for those, such as in the intensive classroom building in classroom, have up to a hundred or hundreds of between the classroom simultaneously using wireless microphone to impart knowledge to students, the technical barrier that is faced is how to solve channeling and the such technical problem of co-channel interference, the reason of adding the aging grade of artificial antenna microphone electronic component causes the drift of frequency easily, also causes cross-talk easily.
For solving the problems of the technologies described above, in the prior art, the wireless microphone that can regulate operating frequency is arranged,, publication number open as on July 26th, 2006 is that the Chinese invention patent ublic specification of application that CN 2808923A, name are called " a kind of VHF-UHF wireless microphone " discloses a kind of, send an infrared signal that comprises operating frequency by the microphone transmitting terminal, after receiving terminal receives this signal, change the operating frequency of receiving terminal, make its operating frequency consistent with transmitting terminal.This mode is just utilized infrared signal, can operating frequency be switched according to the judgement of user to voice communication quality.The sound signal quality that this mode needs receiving terminal that the user hears according to oneself to amplify the back loud speaker to send, have and noiselessly judge, then, decision is the switch operating frequency, continuous like this adjustment, up to picking out satisfied operating frequency, i.e. communication channel.
But this mode needs the user to judge, constantly adjust, and it still is pretty troublesome using like this.In addition, in use, communication channel is received when disturbing, and needs again to adjust, and teaching, lecture or meeting are interrupted.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned deficiency of the prior art, provides a kind of antijamming capability strong digital cordless microphone.
In order to realize the foregoing invention purpose, digital cordless microphone of the present utility model comprises transmitting terminal and receiving terminal,
The transmitting terminal pick-up picks up sound, with the voice signal that picks up, converts the packets of audio data of band unique address sign indicating number by the sample code circuit to, sends to receiving terminal after amplifying by the modulation of rf modulations amplifying circuit;
Receiving terminal preset with packets of audio data in the identical address code of unique address sign indicating number;
The receiving terminal radio frequency receives amplification demodulator circuit radiofrequency signal that will receive, that transmitting terminal sends and receives, amplifies, and demodulate the packets of audio data of described band unique address sign indicating number, and send in the digital decoding circuit, unique address sign indicating number in the packets of audio data and receiving terminal preset address sign indicating number compare, if coupling, then packets of audio data decoding restores simulated audio signal, amplify by audio power amplifying circuit, deliver to loudspeaker plays and come out; If do not match, just do not receive.
Digital cordless microphone of the present utility model is to realize the foregoing invention purpose like this, because the digital wireless microphone transmitting terminal of every cover and receiving terminal be an identical unique address sign indicating number all, the address code that is every suit digital cordless microphone all is inequality, this address code adds in the packets of audio data at transmitting terminal, receiving terminal receives only the packets of audio data with the address code coupling, therefore, need a large amount of wireless microphones that use at those, such as in the intensive classroom building in classroom, have up to a hundred or hundreds of between the classroom simultaneously using wireless microphone to impart knowledge to students, can not cause cross-talk, simultaneously yet, transmission of audio signals adopts Digital Transmission, and antijamming capability also is improved.
As improvement, transmitting terminal transmission packets of audio data is behind receiving terminal, and receiving terminal confirms that nothing mistakenly launches one and returns the affirmation bag to transmitting terminal, just loses this bag transmission next one bag after transmitting terminal is received; In case data are surrounded by problem, transmitting terminal can resend.The benefit of doing like this is quality and the effect that guarantees communication.
As further improvement, anti-interference and reliability in order to improve radio communication overcome in the prior art, the shortcoming that need manually adjust communication channel.The transmitting terminal of digital cordless microphone of the present utility model and receiving terminal are equipped with the frequency hopping register of a plurality of mutual correspondences, each frequency hopping register corresponding operating frequency, i.e. a communication channel;
Receiving terminal is when work, and the handshake that can constantly send with described unique address sign indicating number arrives transmitting terminal;
When the communication channel of working is interfered, when the quality of reception descends, transmitting terminal does not receive handshake, will call the content of next frequency hopping register, jumps to next operating frequency, and keep a period of time, receiving terminal does not receive voice data, can call the content of next frequency hopping register yet, jumps to next operating frequency, just do not continue to jump to next operating frequency if still receive, till receiving packets of audio data; The transmitting terminal operating frequency is kept a period of time and is not still received handshake, continues to jump to next operating frequency, till receiving handshake.
Like this, can guarantee that digital cordless microphone of the present utility model is operated on the communication channel that does not have to disturb.Although in the intensive classroom building in classroom, have up to a hundred or hundreds of between the classroom simultaneously using wireless microphone to impart knowledge to students, but because the transmitting power of microphone is smaller, the radio frequency co-channel interference has only adjacent classroom to form, therefore, adopt digital cordless microphone of the present utility model tripping interference radio frequency communication channel automatically, thereby improve the anti-interference and the reliability of radio communication, overcome in the prior art shortcoming that need manually adjust communication channel.
Description of drawings
Fig. 1 is the utility model digital cordless microphone schematic diagram;
Fig. 2 is a kind of coded format of the utility model digital cordless microphone unique address sign indicating number;
Fig. 3 is a kind of coded format of the utility model digital cordless microphone packets of audio data.
Embodiment
Below in conjunction with accompanying drawing, the utility model preferred embodiment is described.What need point out is that although similar parts appear in the different accompanying drawings, they are endowed similar reference numerals.In addition, in the following description, when perhaps the detailed description of known function that adopts and design can desalinate subject content of the present utility model, these were described in here and will be left in the basket.
Fig. 1 is the utility model digital cordless microphone schematic diagram.Among the figure, digital cordless microphone comprises transmitting terminal 1 and receiving terminal 2,
101 pairs of sound of transmitting terminal pick-up pick up, and with the voice signal that picks up, convert the packets of audio data of band unique address sign indicating number by sample code circuit 102 to, send to receiving terminal 2 after amplifying by 103 modulation of rf modulations amplifying circuit;
Receiving terminal 2 preset with packets of audio data in the identical address code of unique address sign indicating number;
The receiving terminal radio frequency receives amplification demodulator circuit 201 radiofrequency signal that will receive, that transmitting terminal sends and receives, amplifies, and demodulate the packets of audio data of described band unique address sign indicating number, and send in the digital decoding circuit 202, unique address sign indicating number in the packets of audio data and receiving terminal preset address sign indicating number compare, if coupling, then packets of audio data decoding restores simulated audio signal, amplify by audio power amplifying circuit 203, deliver to loud speaker 204 and play back; If do not match, just do not receive.
In the utility model preferred embodiment, in order to guarantee that wireless microphone public address effect of the present utility model is stereo, high-quality, the voice signal that picks up is converted coding circuit 102 to be with the unique address sign indicating number packets of audio data with the sample frequency of 44.1kHz and the resolution of 16bit, the data flow that is produced is 44.1 * 16 * 2=1.41Mbit/s, and the Audio Processing ability of employing can reach the 4Mbit/s bandwidth.
At transmitting terminal and receiving terminal, adopt DSP or microprocessor, or configuration data loads unique address sign indicating number of the present utility model by the EEPROM/FLASH memory.With the microprocessor is example, in the middle of microprocessor, use foreign currency and write one section program, when beginning to switch on work, microprocessor reads in some parameters of numeric address or the like the on-chip memory of audio chip, by some parameters on the microprocessor audio chip of sample code circuit and rf modulations amplifying circuit is carried out the initial configuration parameter, initial parameter as transmitting power, tranmitting frequency, send channel hopping pattern etc. makes its operate as normal.Dispose the unique address sign indicating number of transmitting terminal and receiving terminal simultaneously,
In this embodiment, the unique digit address sign indicating number of transmitting terminal and receiving terminal, as shown in Figure 2, four bytes are arranged, totally 34, represent with DD1～DD4,4294967296 unique address sign indicating numbers can be arranged in theory for using, so during fabrication, the address code of every suit digital cordless microphone all is inequality, and the address code of the digital wireless microphone of promptly every cover all is unique.
In this embodiment, packets of audio data as shown in Figure 3, comprise synchronous head, frame number, numeric address, DATA and CRC check, synchronous head mainly is that to be used for send-receive clock synchronous; frame number is that data split packing back shooting sequence; the numeric address is a unique address sign indicating number of the present utility model, and DATA is the payload data of emission, and CRC check is used for the error coded check of whole packet.Except that unique address sign indicating number of the present utility model, all the other all are prior aries of packing data transmission, are not giving unnecessary details at this.
In the middle of specific design, can be divided into two kinds:
A kind of is exactly simplex mode, and transmitting terminal sends data always, the affirmation message that does not have receiving terminal whether to receive, receiving terminal is according to the numeric address correspondence, the just work of coupling, and not matching just abandons, She Ji result communicates by letter exactly and can not effectively be guaranteed like this, and is simple many but design is wanted.
A kind of is half-duplex mode, and transmitting terminal transmission packets of audio data is behind receiving terminal, and receiving terminal confirms that nothing mistakenly launches one and returns the affirmation bag to transmitting terminal, just loses this bag transmission next one bag after transmitting terminal is received; In case data are surrounded by problem, transmitting terminal can resend.The benefit of doing like this is quality and the effect that guarantees communication.In the present embodiment, operating frequency is 2.4G.When connecting initialization, reflector communicates initial configuration according to the hopping pattern that initialize routine provides, behind the chip initiation, send packets of audio data according to hopping pattern to receiving terminal, on each channel, search for a period of time, such as beginning passage, so that receiver can receive and process search information from CH0.Meanwhile, receiver is monitoring information on all available channels also, each channel is monitored a period of time, in case listen to packets of audio data from reflector, receiver sends response message, and receiver and reflector all lock this channel, to prepare communication, this connected mode helps to prevent to disturb, and reduces the communication collision between other radio-frequency apparatus of working on the 2.4G frequency range.
For anti-interference and the reliability that improves radio communication, during initial configuration application configuration hopping pattern, can be during work according to hopping pattern AFH communication, i.e. FHSS.Such as the operating frequency with 38 adaptive communications, each operating frequency is respectively by frequency hopping register CH0～CH37 control.When frequency hopping, according to the content in the frequency hopping register, change operating frequency in order, that is to say, when the frequency of CH0 is interfered and can't carries out radio frequency when connecting, can use CH1 to connect, if CH1 is interfered, then use CH2, and the like.Therefore, before frequency hopping communications, it is very important something that each frequency hopping register will carry out initialization by microcontroller.If think CH0 corresponding to frequency 2420MHz, then only need in the CH0 register, write 20, if think CH0, then only need in the CH0 register, write 40 corresponding to frequency 2440MHz, like this, when frequency hopping communications, chip just in order frequency hopping arrive corresponding channel.
In this embodiment, employing realizes the function of digital cordless microphone based on the mode of unique address sign indicating number and frequency hop spread spectrum, it is normal that the coupling of unique address sign indicating number just can reach communication, also just reached the purpose of passing on a message, address inconsistent passed on a message and just has no idea to realize, add the characteristics of digital technology, guaranteed the effect of transfer voice, frequency hop spread spectrum has been avoided co-channel interference again, has reached to prevent the purpose used under cross-talk and the high concentration environment.
In this embodiment, considered the design of low energy consumption during the design of the transmitting terminal of digital cordless microphone, service time is long, can use more than 10 hours at least continuously; Adopt the mode of rechargeable battery to come its power supply simultaneously, the lithium battery of a 3.7V 900mAh can use the time about 1 year.
In this embodiment, the actual operating position of design consideration adds laser pen when actual production, can allow user's emphasis of punctuating as associate member.
In this embodiment, it is the S/PDIF interface that the receiving terminal design also provides the Sony/Philips digital interface of standard, can be directly connected on computer sound card and the various surround sound equipment.
In another preferred embodiment of the present utility model, the control program that transmitting terminal also is provided with the control computer media PPT page turning of non-voice writes in the microcontroller, the switch value of controlling by transmitting terminal, instruction is carried in wireless transmission link the inside together, write assembler in the microcontroller of receiving terminal as the page turning of control multimedia, after receiving terminal receives the control signal of transmitting terminal, drive the USB interface chip by microcontroller, as the PDUIUSBD12 chip of Philips, control computer page turning up and down by interface routine.Just by HID, promptly two keys of " PgUp " of man-machine interface simulation computer keyboard and " PgDn " can also have other function key such as blank screen etc., as long as update routine is just passable.The USB interface chip is under the operating system of Windows etc., and interface drives and can dispose automatically by computer, and the function of plug and play is promptly arranged.
Such design, for the personnel that use in the specific occasion, such as, want wireless public address on one side, will control the user of computer PPT page turning with regard to particularly useful place, such as teacher on one side, he just can control the content of being given a lecture according to the progress situation of speech of oneself, as the PPT document.
Although above the illustrative embodiment of the utility model is described; but should be understood that; the utility model is not limited to the scope of embodiment; to those skilled in the art; as long as various variations appended claim limit and the spirit and scope of the present utility model determined in; these variations are conspicuous, and all innovation and creation that utilize the utility model design are all at the row of protection.
Claims (2)
1. a digital cordless microphone comprises transmitting terminal and receiving terminal, it is characterized in that:
Transmitting terminal comprises:
One pick-up is used for sound is picked up;
One sample code circuit is used for the voice signal with microphone pickup, converts the packets of audio data of band unique address sign indicating number to;
One rf modulations amplifying circuit sends to receiving terminal after being used for packets of audio data modulation amplified;
Receiving terminal comprises:
One radio frequency receives and amplifies demodulator circuit, is used to receive the radiofrequency signal that transmitting terminal sends, and demodulates the packets of audio data of described band unique address sign indicating number after amplifying;
One presets the digital decoding circuit of the address code identical with unique address sign indicating number in the packets of audio data, be used for radio frequency receive is amplified the comparison of address code with the address code that presets of the packets of audio data that demodulator circuit solves, if coupling, then packets of audio data decoding, restore simulated audio signal, if do not match, just do not receive;
One audio power amplifying circuit and, be used for amplifying of the former simulated audio signal that goes out of digital decoding circuit;
One loud speaker is used for the broadcast that audio-frequency power amplifier amplifies and exports.
2. digital cordless microphone according to claim 1 is characterized in that, described transmitting terminal and receiving terminal are equipped with the frequency hopping register of a plurality of mutual correspondences, the corresponding operating frequency of each frequency hopping register;
Receiving terminal is when work, and the handshake that can constantly send with described unique address sign indicating number arrives transmitting terminal;
When the communication channel of working is interfered, when the quality of reception descends, transmitting terminal does not receive handshake, will call the content of next frequency hopping register, jumps to next operating frequency, and keep a period of time, receiving terminal does not receive voice data, can call the content of next frequency hopping register yet, jumps to next operating frequency, just do not continue to jump to next operating frequency if still receive, till receiving packets of audio data; The transmitting terminal operating frequency is kept a period of time and is not still received handshake, continues to jump to next operating frequency, till receiving handshake.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200809473U CN201146501Y (en) | 2007-09-05 | 2007-09-05 | Digital cordless microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200809473U CN201146501Y (en) | 2007-09-05 | 2007-09-05 | Digital cordless microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201146501Y true CN201146501Y (en) | 2008-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200809473U Expired - Fee Related CN201146501Y (en) | 2007-09-05 | 2007-09-05 | Digital cordless microphone |
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| CN (1) | CN201146501Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983925A (en) * | 2012-05-31 | 2013-03-20 | 林永宗 | Intelligent audio broadcast system automatically negotiating parameter configuration |
| CN106664142A (en) * | 2014-05-13 | 2017-05-10 | 美国思睿逻辑有限公司 | Systems and methods for reducing digital interference of external signals |
| CN109729542A (en) * | 2019-02-01 | 2019-05-07 | 广州普正生物科技有限公司 | A kind of one-to-many antijam wireless communication method |
| CN110650391A (en) * | 2018-06-26 | 2020-01-03 | 深圳斐海科技有限公司 | Wireless microphone system and identification method thereof |
-
2007
- 2007-09-05 CN CNU2007200809473U patent/CN201146501Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983925A (en) * | 2012-05-31 | 2013-03-20 | 林永宗 | Intelligent audio broadcast system automatically negotiating parameter configuration |
| CN102983925B (en) * | 2012-05-31 | 2016-03-30 | 林永宗 | A kind of intelligent audio broadcast system of auto-negotiation parameter configuration |
| CN106664142A (en) * | 2014-05-13 | 2017-05-10 | 美国思睿逻辑有限公司 | Systems and methods for reducing digital interference of external signals |
| CN106664142B (en) * | 2014-05-13 | 2020-04-10 | 美国思睿逻辑有限公司 | System and method for reducing digital interference of external signals |
| CN110650391A (en) * | 2018-06-26 | 2020-01-03 | 深圳斐海科技有限公司 | Wireless microphone system and identification method thereof |
| CN110650391B (en) * | 2018-06-26 | 2020-11-13 | 深圳斐海科技有限公司 | Wireless microphone system and identification method thereof |
| CN109729542A (en) * | 2019-02-01 | 2019-05-07 | 广州普正生物科技有限公司 | A kind of one-to-many antijam wireless communication method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081105 Termination date: 20110905 |