CN101047408B - Digital radio microphone system - Google Patents
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- CN101047408B CN101047408B CN2006100668920A CN200610066892A CN101047408B CN 101047408 B CN101047408 B CN 101047408B CN 2006100668920 A CN2006100668920 A CN 2006100668920A CN 200610066892 A CN200610066892 A CN 200610066892A CN 101047408 B CN101047408 B CN 101047408B
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Abstract
A digitalized radio microphone system is prepared as forming each of digitalized radio microphone by connecting sound transmitter and digital radio microphone as well as antenna in sequence; forming multi-channel intelligent receiving-controlling device by computer as well as by connecting multi-channel receiving-transmitting unit, voice signal processing unit, voice playback and output unit in sequence; connecting antenna unit to said multi-channel receiving-transmitting unit and assigning a unique network address for each digitalized radio microphone.
Description
Invention field
The invention belongs to field of wireless communication, specifically, the present invention relates to a kind of digital radio microphone system that comprises one or more wireless microphones and multichannel intelligence receiving control device thereof.
Background of invention
Wired microphone is widely used in our daily life, and news briefing and various parties etc. are trained, held in for example company's regular meeting, marketing meeting, inside and outside.Its effect is that voice signal is amplified or long-distance transmissions, by the Yang Sheng device voice signal is carried out playback again.Existing wireless microphone and wire microphone bring a lot of convenience by comparison, such as conveniently moving, are not subjected to the restriction of conductor length etc.But also there are some problems in existing wireless microphone system, thereby is subjected to certain restriction on using.
Existing wireless microphone normally adopts mode of frequency regulation (be Frequency modulation, be called for short FM), just the voice analog signal of microphone is directly modulated radio frequency signal, launches by antenna then.At receiving terminal the frequency modulation wireless signal of modulating is carried out demodulation, voice signal is recovered,, finish the playback of voice signal through amplifying rear drive Yang Sheng device.This wireless microphone system has following weak point:
(1) confidentiality is not strong.Any FM receiver (as FM receiver) is as long as the adjustment frequency can receive.
(2) operating frequency is fixed, and can not detect and avoid the interference signal from same frequency automatically.
(3) power consumption is big.Open microphone because need only one, wireless signal is emission always just.This is a very big shortcoming for the wireless microphone that uses battery.
(4) when a plurality of wireless microphones use simultaneously, the phase mutual interference can appear.
Summary of the invention
The objective of the invention is problem that existing wireless microphone system is existed, propose corresponding solution, a kind of strong security, power consumption are little, the digital radio microphone system of strong interference immunity thereby provide.
For achieving the above object, digital radio microphone system provided by the invention, as shown in Figure 1, comprise that (n is a positive integer for 1 or n digital radio microphone here, be generally less than 10,000) and multichannel intelligence receiving control device 160 and antenna element 110 thereof, it is characterized in that each digital radio microphone (exemplarily, for example first) comprises microphone unit 101a, digital wireless microphone unit 102a and the antenna 103a that connects successively; Described multichannel intelligence receiving control device 160 comprises computer or operating console 150 and the multichannel Transmit-Receive Unit 120 that is connected successively, voice signal processing unit 130, audio playback and output unit 140, and described multichannel Transmit-Receive Unit 120 links to each other with antenna element 110.
Described each digital radio microphone (exemplarily, for example first) has a unique network address, and (hexadecimal address of 40 bits for example: EE CC BB AA 99), this address is called physical address.
Whether the frequency channels that described each digital radio microphone is used for behind the power supply opening of this digital radio microphone in the testing frequency band automatically is occupied, if it is occupied, then jump to next frequency channels, till detecting idle frequency channels, utilize idle channel then, send the application for registration packet of the network address that has this digital radio microphone;
Described multichannel intelligence receiving control device is used to receive described application for registration packet, confirms packet and distributes to dynamic address, channel frequency and a time slot to the digital radio microphone transmission application for registration of application for registration.
Described microphone unit 101a adopts common electret microphone or silicon microphone or piezoelectric patches microphone.
Described antenna adopts whip antenna or complex media antenna, or the stripline antenna of a bit of metal wire on printed substrate (PCB) and PCB dielectric-slab formation.
Described digital wireless microphone unit 102a comprises biasing circuit unit 211, audio amplifier circuit 212, audio frequency filter circuit 213, A/D analog-digital converter 214, MPU microprocessor unit 215, radio frequency Rx/Tx Transmit-Receive Unit 216, impedance matching circuit 217 and the radio frequency band filter 218 that connects successively.
It is processor or 8051 follow-on microprocessors of core that described MPU microprocessor unit 215 adopts with 8051 series, perhaps adopts the chip of little power consumption processor; The firmware program of these MPU microprocessor unit 215 operations oneself is responsible for control, storage, exchange and processing.
Described radio frequency Rx/Tx Transmit-Receive Unit 216 comprise integrated RF frequency synthesizer, low noise amplifier, emission power amplifier, crystal oscillator, modulation/demodulation circuit, band address burst of data packet protocol engine and with the interface circuit of microprocessor.
Described A/D analog-digital converter 214 and described MPU microprocessor unit 215 and described radio frequency Rx/Tx Transmit-Receive Unit 216 can be integrated together, constitute a system-on-a-chip (SOC).
Described multichannel Transmit-Receive Unit 120 comprises at least one wireless receiving and dispatching channel physically; A wireless receiving and dispatching channel (exemplarily, as first) physically comprises RF band pass filter 321a, impedance matching circuit 322a and the radio frequency Rx/Tx Transmit-Receive Unit 323a that connects successively.
Described microphone unit 101a converts the voice signal that receives to the signal of telecommunication and is sent to digital wireless microphone unit 102a, after digital wireless microphone unit 102a carried out filtering, amplification, quantification, compression, sized-multiple, packing with the signal of telecommunication, modulated radio signal was launched by antenna 103a.
After described multichannel intelligence receiving control device 160 is received radiofrequency signal from a plurality of wireless microphones by antenna element 110, after process multichannel Transmit-Receive Unit 120 carries out mixing, amplification, filtering, shaping, give voice signal processing unit 130 with the digital signal transfers that obtains.
130 pairs of single microphone digital signals of described voice signal processing unit are carried out decompress(ion), are separated mixed, echo cancellation process; And the multi-path voice signal is carried out data fusion, wave beam formation, voice enhancement process, export to audio playback and output unit 140 then; Audio playback and output unit 140 will carry out digital-to-analog conversion (D/A), filtering and amplification, output analog voice signal after treatment through the audio digital signals of voice signal processing unit 130 outputs.
150 pairs of multichannel Transmit-Receive Units 120 of described computer or operating console are programmed, with the form and the error correcting system of the channel quantity of determining its work, operating frequency, time slot, wireless data packet switch; Voice signal processing unit 130 is carried out programming Control, in the mode of determining that its voice signal is handled; Audio playback and output unit 140 are controlled, as the cut-off frequency setting of output level adjusting, filter.
Because the present invention has adopted analog voice signal is carried out digital quantization, and with the signal of the digital quantization wireless transmission with the address date bag, therefore, the power consumption of the digital radio microphone described in the present invention is very little.For example, generally 8 of 8KHz sample frequency, resolution bits are adopted in the quantification of voice signal, the bandwidth of such voice channel is 64Kbit/s, and the signal of modulating during wireless transmission is generally 1Mbit/s or higher.Like this, voice channel only accounts for about ten sixths of rf modulated signal bandwidth.That is to say that even if realize real-time voice transfer (have the regular hour to postpone, common people are imperceptible), the time of ten sixths of only having an appointment, radio-frequency head is in emission state, therefore, has reduced power consumption widely.When adopting compress speech, power consumption can be littler.The present invention especially is fit to battery-powered occasion.
Compare with prior art, the present invention has following advantage:
(1) whether the Intelligent Measurement wireless channel is occupied, avoids occupied interference channel.
(2) power consumption is very low, and the wireless microphone cell operation time is long, is fit to the application scenario of battery as power supply.
(3) strong security.Can adopt coding, sized-multiple, compression etc. to maintain secrecy in the wireless transmission.
(4) support a plurality of wireless microphones to work simultaneously, especially be fit to occasions such as videoconference.
(5) can have functions such as compress speech, echo cancellation, voice enhancing, the fusion of more voice channel data and wave beam formation, improve the speech quality of playback signal widely.
Description of drawings
Fig. 1 digital radio microphone system schematic diagram
The firmware flow chart of Fig. 2 digital radio microphone unit and multichannel intelligence receiving control device
The embodiment schematic diagram of Fig. 3 digital radio microphone unit
The embodiment schematic diagram of Fig. 4 multichannel intelligence receiving system
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Embodiment 1
Fig. 1 shows one embodiment of the present of invention schematic diagram.The present invention is that a kind of digital radio microphone system comprises that 1 or n digital radio microphone (n is a positive count, is generally less than 10,000) and multichannel intelligence receiving control device 160 and antenna element 110 thereof form here.Each digital radio microphone (is example with the first digit wireless microphone) comprises microphone unit 101a, digital wireless microphone unit 102a and antenna 103a.Multichannel intelligence receiving control device 160 comprises multichannel Transmit-Receive Unit 120, voice signal processing unit 130, audio playback and output unit 140 and computer or operating console 150.
Operation principle of the present invention is such (with reference to figure 2): each digitized wireless microphone (exemplarily, for example first) a unique network address is arranged, and (hexadecimal address of 40 bits for example: EECC BB AA 99), this address is called physical address.Behind the power supply opening of this microphone, just automatically whether the frequency channels in testing frequency band (for example need not the radio band that applies for a license, ISM 2.4GHz frequency range) is occupied for its, if occupied, then jump to next frequency channels, till detecting idle frequency channels.Utilize idle channel then, send the application for registration packet that has own physical address.After multichannel intelligence receiving control device 160 receives the application for registration packet by antenna element 110, confirm packet to the microphone transmission application for registration of application for registration, and distribute to dynamic address, channel frequency and a time slot.Like this, a wireless data link has just been set up, and after this, this digital radio microphone is mainly as the wireless data transmitting terminal, and multichannel intelligence receiving control device 160 carries out the wireless transmission or the communication of data as main wireless data receiving terminal.Microphone unit 101a converts the voice signal that receives to the signal of telecommunication and is connected to digital wireless microphone unit 102a, after digital wireless microphone unit 102a carried out filtering, amplification, quantification, compression, sized-multiple, packing with the signal of telecommunication, modulated radio signal was launched by antenna 103a.After multichannel intelligence receiving control device 160 is received radiofrequency signal from a plurality of wireless microphones by antenna element 110, after process multichannel Transmit-Receive Unit 120 carries out mixing, amplification, filtering, shaping, give voice signal processing unit 130 with the digital signal transfers that obtains.Voice signal processing unit 130 not only finish single microphone digital signal decompress(ion), separate outside voice signal such as mixed, echo elimination handles, the functions such as data fusion, wave beam formation, voice enhancing that can also finish the multi-path voice signal are so that its audio digital signals quality of exporting to audio playback and output unit 140 reaches best.Audio playback and output unit 140 will carry out digital-to-analog conversion (D/A), filtering and amplification through the audio digital signals of voice signal processing unit 130 outputs, after treatment analog voice signal of output, and it is first-class to be connected to voice-output device such as loud speaker, earphone, Internet (Internet) or the public telephone network of far-end.
150 pairs of multichannel Transmit-Receive Units 120 of computer or operating console, voice signal processing unit 130, audio playback and output unit 140 carry out various control operations, for example, multichannel Transmit-Receive Unit 120 is programmed, with the form of the channel quantity of determining its work, operating frequency, time slot, wireless data packet switch and error correcting system etc.; Voice signal processing unit 130 is carried out programming Control, in the mode of determining that its voice signal is handled; Audio playback and output unit 140 are controlled, as output level regulate, the cut-off frequency of filter is provided with etc.
Embodiment 2
Fig. 3 shows another embodiment of the digital radio microphone among the present invention.For the situation of a plurality of digital radio microphones, difference each other is that each digital radio microphone has unique physical address, just as the ether that uses on our computer (Ethernet) network interface card.This example has only provided the digital radio microphone part.Multichannel intelligence receiving control device is the same with embodiment 1 or embodiment's 3, no longer repeats here.
As shown in Figure 1, digital radio microphone is made up of microphone unit, digital wireless microphone unit and antenna.Form by microphone unit 101a, digital wireless microphone unit 102a and antenna 103a as the first digit wireless microphone, the second digit wireless microphone is made up of the second microphone unit 101b, the second digital wireless microphone unit 102b and the second antenna 103b, and n digital radio microphone is made up of n microphone unit 101n, a n digital wireless microphone unit 102n and n antenna 103n.
Exemplarily, described microphone unit 101a can be the microphone of a broad sense, can be the microphone of a pair of broad sense also, corresponds respectively to the usually said monophony and the situation of stereophony microphone.The function of described microphone unit 101a is to convert speech sound waves to the signal of telecommunication.Described microphone unit 101a can be common electret microphone, also can be silicon microphone, and the microphone of other form (as piezoelectric patches etc.), as long as can convert speech sound waves to the signal of telecommunication.
Exemplarily, described antenna 103a can be common whip antenna, complex media antenna, also can be the stripline antenna that a bit of metal wire on printed substrate (PCB) and PCB dielectric-slab constitute.
Exemplarily, described digital wireless microphone unit 102a comprises biasing circuit unit 211, audio amplifier circuit 212, audio frequency filter circuit 213, A/D analog-digital converter 214, MPU microprocessor unit 215, radio frequency Rx/Tx Transmit-Receive Unit 216, impedance matching circuit 217 and radio frequency band filter 218.
Described biasing circuit unit 211 does not have power frequency to disturb the bias voltage and the electric current of (for example the frequency of our employed industry and office electricity consumption is 50 hertz) for described microphone unit 101a provides.Usually after adopting the low pass filter filtering of resistance formation, be connected by the direct and described microphone unit 101a of resistance again.Described biasing circuit unit 211 is ac-coupled to described audio amplifier circuit 212 with the signal of telecommunication that described microphone unit 101a produces.
The function of described audio amplifier circuit 212 is that audio signal is amplified.To common microphone, the multiplication factor of amplifying circuit is generally amplifies 5 to 100 times.Described audio amplifier circuit 212 can adopt discrete transistor, also can adopt the special-purpose integrated operational amplifier circuit that aims at microphone amplification circuit.
The filter circuit of a kind of broad sense of described audio frequency filter circuit 213.Its function is interference signal to be had the decay of certain intensity, and keeps interested voice signal.Described audio frequency filter circuit 213 can be active filter, also can be passive filter.It generally is the band pass filter of a first order pole or multipole point.Exemplarily, for the situation of call voice, described audio frequency filter circuit 213 can be one four pole bandpass filter, is 200Hz by frequency down, and going up by frequency is 3400Hz.
For the situation that adopts integrated operational amplifier, described audio amplifier circuit 212 and described audio frequency filter circuit 213 can be realized together, promptly finish the amplification and the active power filtering of audio signal on same operational amplifier.
Described A/D analog-digital converter 214 is analogue-to-digital converters spares of a kind of broad sense, and its function converts analog voice signal to digital signal exactly, realizes the quantification of analog signal.It can be common A/D analog-digital converter (exemplarily, as 8 of resolutions, 10,12,16 A/D converters), also can be various analog to digital coding decoders (exemplarily, as CODEC speech codec etc.).
Exemplarily, MPU microprocessor unit 215 is microprocessor chips of a kind of broad sense, and it is the cardiac component of described digital wireless microphone unit 102a, and its function is the firmware program of operation oneself, is responsible for control, storage, exchange and processing etc.MPU microprocessor unit 215 can be to be processor or 8051 follow-on microprocessors of core with 8051 series, it also can be chip with the little power consumption processor of Texas Instruments (TI), as little power consumption processor of MSP430 series, and other microprocessor.
Described radio frequency Rx/Tx Transmit-Receive Unit 216 is modules of the complete radio-frequency receiving-transmitting function of having of broad sense.It comprises integrated RF frequency synthesizer, low noise amplifier, emission power amplifier, crystal oscillator, modulation/demodulation circuit, band address burst of data packet protocol engine and with the interface circuit of microprocessor.The commercial chip that can realize described radio frequency Rx/Tx Transmit-Receive Unit 216 functions is many, exemplarily, at the ISM of 2.4GHz (do not need apply for a license radio band), the commercial chip nRF2401 and the nRF24L01 that have Nordic Semiconductor ASA company to produce.The application note of these chips can be from the website of NordicSemiconductor ASA company
Http:// www.nvlsi.noDownload.
Described A/D analog-digital converter 214 and described MPU microprocessor unit 215 and described radio frequency Rx/Tx Transmit-Receive Unit 216 can be integrated together, constitute a system-on-a-chip (SOC).Exemplarily, at the ISM of 2.4GHz (do not need apply for a license radio band), the commercial chip nRF24E1 that has Nordic SemiconductorASA company to produce.The application note of this chip can be from the website of NordicSemiconductor ASA company
Http:// www.nvlsi.noDownload.
Described impedance matching circuit 217 is impedance inverter circuits of a kind of broad sense, and its function is that the difference output transform with radio frequency Rx/Tx Transmit-Receive Unit 216 becomes single-ended radio frequency output, and with impedance conversion to the impedance phase coupling of antenna so that be connected with antenna.The impedance of general antenna all is 50 ohm a antenna, and therefore, described impedance matching circuit 217 is exactly the single-ended output with the difference output transform to 50 of radio frequency Rx/Tx Transmit-Receive Unit 216 ohm, generally, can finish with some inductance and electric capacity.Itself be output as 50 ohm situation for radio frequency Rx/Tx Transmit-Receive Unit 216, described impedance matching circuit 217 can omit.
Described radio frequency band filter 218 is radio frequency band filters of a kind of broad sense.Its function is that the outer frequency component of service band is decayed greatly as far as possible.It can be surface acoustic wave (SAW) band pass filter, also can be film bulk acoustic (FBAR) band pass filter, also can be the medium band pass filter, also can be the simple LC band pass filter that is composed in parallel by an inductance and electric capacity.
Embodiment 3
Fig. 4 shows another embodiment of the digital radio microphone system among the present invention.Here only provided the multichannel intelligence receiving system in the present embodiment.One or more digital radio microphones can be identical with embodiment 1, embodiment 2, no longer repeats here.
Multichannel intelligence receiving system in the present embodiment comprises antenna part, multichannel Transmit-Receive Unit 120, voice signal processor (DSP) and microprocessor (MPU) unit 330, audio playback and output unit 140 and computer (PC) or operating console 150.
The part that present embodiment is identical with the operation principle of embodiment 1 repeats no longer here, and different parts are: described computer (PC) or operating console 150 are computer or operational control units of a kind of broad sense.Its function is carried out communication with described voice signal processor (DSP) and microprocessor (MPU) unit 330 exactly, to finish various controls and operating function, also can obtain speech data from described voice signal processor (DSP) and microprocessor (MPU) unit 330, and store on described computer (PC) hard disk, or on restore after the compression hard disk or the CD.
Described antenna part is made up of one or more antennas; Also can be to tell a plurality of antennas termination by a minute multiplexer, be connected with described multichannel Transmit-Receive Unit 120 by single exterior antenna.Antenna generally is common whip antenna, complex media antenna, also can be the stripline antenna that a bit of metal wire on printed substrate (PCB) and PCB dielectric-slab constitute.
Described multichannel Transmit-Receive Unit 120 comprises one or more wireless receiving and dispatching channels physically.A wireless receiving and dispatching channel (exemplarily, as first) physically comprises that RF band pass filter 321a, impedance matching circuit 322a and radio frequency Rx/Tx Transmit-Receive Unit 323a form.A described wireless receiving and dispatching channel physically also can receive the signal of a plurality of channels simultaneously.
Described RF band pass filter 321a is a kind of radio frequency band filter of broad sense.Its function is that the frequency component beyond the working band is decayed greatly as far as possible.It can be surface acoustic wave (SAW) band pass filter, also can be film bulk acoustic (FBAR) band pass filter, also can be the medium band pass filter, also can be the simple LC band pass filter that is composed in parallel by an inductance and electric capacity.
Described impedance matching circuit 322a is a kind of impedance inverter circuit of broad sense, and its function is that the difference output transform with radio frequency Rx/Tx Transmit-Receive Unit 323a becomes single-ended radio frequency output, so that be connected with antenna.The impedance of general antenna all is 50 ohm a antenna, and therefore, described impedance matching circuit 322a becomes the difference output transform of radio frequency Rx/Tx Transmit-Receive Unit 216 50 ohm single-ended output, generally, can finish with some inductance and electric capacity.323a itself is output as 50 ohm situation for radio frequency Rx/Tx Transmit-Receive Unit, and described impedance matching circuit 322a can omit.
Described radio frequency Rx/Tx Transmit-Receive Unit 323a is the module of the complete radio-frequency receiving-transmitting function of having of broad sense.It comprises integrated RF frequency synthesizer, low noise amplifier, emission power amplifier, crystal oscillator, modulation/demodulation circuit, band address burst of data packet protocol engine and with the interface circuit of microprocessor.The commercial chip that can realize described radio frequency Rx/Tx Transmit-Receive Unit 323a function is many, exemplarily, at the ISM band of 2.4GHz (do not need apply for a license radio band), the commercial chip nRF2401 and the nRF24L01 that have Nordic Semiconductor ASA company to produce.Adopt nRF2401 radio frequency Rx/Tx Transmit-Receive Unit 323a can receive the signal of 2 frequency channels simultaneously; Adopt nRF24L01 radio frequency Rx/Tx Transmit-Receive Unit 323a can receive the signal of 6 channels simultaneously.The application note of these chips can be from the website of NordicSemiconductor ASA company
Http:// www.nvlsi.noDownload.
Described voice signal processor (DSP) and microprocessor (MPU) unit 330 are a kind of signal processing and microprocessor control unit of broad sense, and its function is to finish the transmission of multichannel digital signal, storage, Digital Signal Processing, a plurality of described multichannel Transmit-Receive Units 120 are carried out programming Control and carry out communication with described computer (PC) or operating console 150.
Voice signal processor (DSP) in described voice signal processor (DSP) and microprocessor (MPU) unit 330 is a kind of unit of Digital Signal Processing of broad sense, mainly finishes compression/de-compression, the sized-multiple/separate functions such as sized-multiple, echo elimination, data fusion, wave beam formation, voice enhancing so that its audio digital signals quality of exporting to audio playback and output unit 140 reaches best of multicenter voice signal.There is the signal processing chip of a lot of commercializations can realize the function of described voice signal processor at present.Exemplarily, as Texas Instrument (TI) (
Http:// www.ti.com) digital signal processor of company's TMS320 series of producing and Motorola (Motorola) (
Http:// www.mot.com) digital signal processing chip etc. of company.The signal processor that has itself has the function of microprocessor concurrently, and in this case, described voice signal processor (DSP) and microprocessor (MPU) unit 330 can not need other microprocessor.
Microprocessor (MPU) unit in described voice signal processor (DSP) device and microprocessor (MPU) unit 330 is a kind of microprocessor of broad sense.It is the cardiac component of described multichannel intelligence receiving system, is responsible for described voice signal processor (DSP), audio playback and output unit 140, multichannel Transmit-Receive Unit 120 are carried out programming Control and carry out communication with described computer (PC) or operating console 150.Less or signal processing load is not too big situation for wireless channel, and the function of described voice signal processor (DSP) can be finished in described microprocessor (MPU) unit, at this time, has not just needed other voice signal processor (DSP) device.Microprocessor (MPU) unit can be general 8051 to be processor or follow-on microprocessor of kernel, also can be the chip with the little power consumption processor of Texas Instruments (TI), as little power consumption processor of MSP430 series.Consider the convenience of carrying out communication, can adopt microprocessor (MPU) unit of peripheral interface controller with described computer (PC) or operating console 150.Exemplarily, if described voice signal processor (DSP) device and microprocessor (MPU) unit 330 adopt serial bus USB and computer (PC) or the operating console 150 stated to carry out communication, microprocessor (MPU) unit then adopts the relatively good of microprocessor with USB controller, as Cypress company (
Http:// www.cypress.com) a series of microprocessors of producing.
Described audio playback and output unit 140 comprise that D/A number-Mo conversion and low-pass filter circuit 341, audio frequency amplify and drive circuit 342.Its function is exactly that the audio digital signals that will quantize reverts to analog signal, and amplifies, so that connect external equipment.
Described D/A number-Mo conversion and low-pass filter circuit 341 comprise D/A D-A converter and low-pass filter circuit.Its function is exactly that the digital signal that will quantize converts analog signal to by the D/A D-A converter, and filters high fdrequency component in the transfer process by low-pass filter circuit.
Described audio frequency amplifies and drive circuit 342 comprises audio amplifier circuit and drive circuit.Its function mainly is that the analog voice signal with conversion of described D/A number-Mo and low-pass filter circuit 341 outputs amplifies and drive the equipment of outside, and it is first-class to be connected to voice-output device such as loud speaker, earphone, Internet (Internet) or the public telephone network of far-end.
Described computer (PC) or operating console 150 are computer or operational control units of a kind of broad sense.Its function is carried out communication with described voice signal processor (DSP) and microprocessor (MPU) unit 330 exactly, to finish various controls and operating function, also can obtain speech data from described voice signal processor (DSP) and microprocessor (MPU) unit 330, and store on described computer (PC) hard disk, or on restore after the compression hard disk or the CD.Exemplarily, can realize each digital wireless microphone unit is controlled, open one or some digital wireless microphones, and allow other digital wireless microphone turn off by described computer (PC) or operating console 150.Exemplarily, described computer (PC) or operating console 150 obtain speech data by USB from described voice signal processor (DSP) and microprocessor (MPU) unit 330, speech data is stored on the hard disk or CD of described computer (PC), also can storage again after overcompression (carrying out compress speech) as adopting MP3 format.Like this, a permanent speech data just remains, so that later voice are carried out playback and retrieval.
Claims (10)
1. digital radio microphone system, comprise 1 or n digital radio microphone and multichannel intelligence receiving control device (160) and antenna element (110) thereof, wherein n is the positive integer less than 10000, it is characterized in that each digital radio microphone comprises microphone unit (101a), digital wireless microphone unit (102a) and the antenna (103a) that connects successively; Described multichannel intelligence receiving control device (160) comprises computer or operating console (150) and the multichannel Transmit-Receive Unit (120) that links to each other successively, voice signal processing unit (130), audio playback and output unit (140), and described multichannel Transmit-Receive Unit (120) links to each other with antenna element (110); Described each digital radio microphone all has a unique network address;
Whether the frequency channels that described each digital radio microphone is used for behind the power supply opening of this digital radio microphone in the testing frequency band automatically is occupied, if it is occupied, then jump to next frequency channels, till detecting idle frequency channels, utilize idle channel then, send the application for registration packet of the network address that has this digital radio microphone;
Described multichannel intelligence receiving control device is used to receive described application for registration packet, confirms packet and distributes to dynamic address, channel frequency and a time slot to the digital radio microphone transmission application for registration of application for registration.
2. by the described digital radio microphone system of claim 1, it is characterized in that described microphone unit (101a) adopts electret microphone, silicon microphone or piezoelectric patches microphone.
3. by the described digital radio microphone system of claim 1, it is characterized in that, described antenna (103a) and antenna element (110) adopt whip antenna or complex media antenna, or the stripline antenna of a bit of metal wire on printed substrate and printed substrate dielectric-slab formation.
4. by the described digital radio microphone system of claim 1, it is characterized in that described digital wireless microphone unit (102a) comprises biasing circuit unit (211), audio amplifier circuit (212), audio frequency filter circuit (213), analog-digital converter (214), MPU microprocessor unit (215), radio frequency Rx/Tx Transmit-Receive Unit (216), impedance matching circuit (217) and the radio frequency band filter (218) that links to each other successively.
5. by the described digital radio microphone system of claim 4, it is characterized in that described analog-digital converter (214) and described MPU microprocessor unit (215) and described radio frequency Rx/Tx Transmit-Receive Unit (216) are integrated into a system-on-a-chip.
6. by the described digital radio microphone system of claim 1, it is characterized in that described multichannel Transmit-Receive Unit (120) comprises the wireless receiving and dispatching channel that at least one RF band pass filter (321a) that links to each other successively, impedance matching circuit (322a) and radio frequency Rx/Tx Transmit-Receive Unit (323a) are formed.
7. by the described digital radio microphone system of claim 1, it is characterized in that described microphone unit (101a) is the microphone that converts the voice signal that receives to the signal of telecommunication and be sent to digital wireless microphone unit (102a); Described digital wireless microphone unit (102a) is for carrying out the signal of telecommunication to be passed to after filtering, amplification, quantification, compression, sized-multiple, the packing digital processing circuit of antenna (103a).
8. by the described digital radio microphone system of claim 1, it is characterized in that, described multichannel Transmit-Receive Unit (120) is to carry out mixing, amplification, filtering and shaping by the radiofrequency signal from a plurality of wireless microphones that antenna element (110) receives, and the digital signal transfers that obtains is given the digital processing circuit of voice signal processing unit (130).
9. by the described digital radio microphone system of claim 1, it is characterized in that, described voice signal processing unit (130) is that single microphone digital signal is carried out decompress(ion), separated mixed, echo cancellation process, and the multi-path voice signal is carried out data fusion, wave beam formation, voice enhancement process, export to the digital processing circuit of audio playback and output unit (140) then; Audio playback and output unit (140) carry out digital-analogue conversion, filtering and amplification to audio digital signals, the signal processing circuit of output analog voice signal after treatment.
10. by the described digital radio microphone system of claim 1, it is characterized in that, described computer or operating console (150) are that multichannel Transmit-Receive Unit (120) is controlled, with the form and the error correcting system of the channel quantity of determining its work, operating frequency, time slot, wireless data packet switch; And voice signal processing unit (130) is controlled to determine the mode of voice signal processing; And audio playback and output unit (140) are carried out output level regulate computer or the operating console that is provided with filter cutoff frequency.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102882541B (en) * | 2011-07-14 | 2015-11-18 | 深圳光启高等理工研究院 | A kind of wireless communication apparatus being integrated in pcb board |
| CN104093174B (en) | 2014-07-24 | 2018-04-27 | 华为技术有限公司 | A kind of data transmission method, system and relevant device |
| CN104601235A (en) * | 2014-12-31 | 2015-05-06 | 青岛黄海学院 | Audio signal visible light transmitting device |
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| CN105679326B (en) * | 2015-12-31 | 2019-07-19 | 武汉鸿瑞达信息技术有限公司 | The stereo optimization system of internet 3D and method under weak environment |
| CN107181991B (en) * | 2017-07-06 | 2023-08-15 | 深圳市好兄弟电子有限公司 | Wireless microphone and central control system of wireless microphone system |
| CN107889027A (en) * | 2017-12-20 | 2018-04-06 | 泰州市银杏舞台机械工程有限公司 | A kind of voice collection device |
| CN109348364A (en) * | 2018-10-31 | 2019-02-15 | 厦门亿联网络技术股份有限公司 | A kind of wireless microphone system, control method and audio/video conference system |
| CN109712639A (en) * | 2018-11-23 | 2019-05-03 | 中国船舶重工集团公司第七0七研究所 | A kind of audio collecting system and method based on wavelet filter |
| CN110299924B (en) * | 2019-06-26 | 2021-07-23 | 厦门大学嘉庚学院 | Wireless microphone sound amplification system and method capable of automatically avoiding interference signals |
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| CN101047408A (en) | 2007-10-03 |
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