CN101436909A - Wireless audio emission, acceptance and transmitting/receiving device, and wireless audio transmission method - Google Patents
Wireless audio emission, acceptance and transmitting/receiving device, and wireless audio transmission method Download PDFInfo
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Abstract
The invention relates to a wireless audio receiving and transmitting device, which comprises an MCU, a tridimensional audio analog-to-digital converter (ADC), a tridimensional audio digital-to-analog converter (DAC) and a radio frequency transceiver circuit, wherein the MCU comprises an audio compression coder and an audio decompression decoder which adopt a software program stored in the MCU to achieve the compression and the decompression of digital audio; the tridimensional audio analog-to-digital converter (ADC) converts an analog audio signal into a digital audio signal; an audio compression coded program in the MCU compresses and codes the digital audio signal which is modulated by the radio frequency transceiver circuit and then is transmitted out; and under the control of the MCU, the radio frequency transceiver circuit changes from a transmitting state to a receiving state simultaneously to receive signals transmitted from the outside. The wireless audio receiving and transmitting device has a simple circuit structure and flexible circuit configuration mode which can perform functional upgrading; besides, the invention also provides a wireless audio receiving and transmitting device and a wireless audio transmission method matched with the wireless audio transmit receiving and transmitting device.
Description
Technical field
The present invention relates to a kind of electronic installation, particularly relate to a kind of ANTENN AUDIO emission, reception and R-T unit and wireless audio transmission method.
Background technology
In home theater, the line of two rearmounted surround speakers is not that easily line is easy to destroy the layout in whole room, hinders professional audio transmission line attractive in appearance and that needs are expensive and comes the transmission of music signal.And the ANTENN AUDIO transmitting device can save the long line of surround speaker, can break away from the constraint of line.
Prior art ANTENN AUDIO transmitting device such as above-mentioned wireless sound box, wireless headset and wireless microphone, generally adopts pure analogue technique to come the transmission of digital audio signal.Be generally operational in ISM band such as 900M, 433M, all adopt the simulated audio signal mode to transfer amplifier to transmit and receive, and that its shortcoming is an antijamming capability is low, background noise is excessive and power consumption is big.
Please refer to Fig. 1, is a kind of electrical block diagram of ANTENN AUDIO emitter of prior art.This ANTENN AUDIO emitter 100 comprises MCU (microprogram control unit) 11, EEPROM (ElectronicallyErasable Read-Only Memory, electrically erasable read-only memory) 12, stereo audio AD (analog/digital) transducer 13, audio coder 14, keyboard 15, display driver 16, display circuit 17, radio circuit 18, with amplifier 19, outside stereo input input by stereo audio AD converter 13, convert simulated audio signal to pulse code modulation (Pulse Code Modulation, PCM) digital audio-frequency data, after handling through further audio coder 14 again, be sent to MCU 311 and add some communication protocol information, deliver to radio circuit 18 and handle back formation radio signal, launch after amplifying through amplifier 19 at last.
Please refer to Fig. 2, is a kind of electrical block diagram of ANTENN AUDIO receiving system of prior art.This ANTENN AUDIO receiving system 200 is used to receive the carrier signal of Fig. 1 emission, and it comprises MCU 21, EEPROM 22, stereo audio DA transducer 23, audio decoder 24, keyboard 25, display driver 26, display circuit 27 and radio circuit 28.Antenna receives from the wireless signal of Fig. 1 emission, be demodulated to digital audio and video signals by radio circuit 28 and be sent to the MCU21 treatment circuit, convert digital audio and video signals to simulated audio signal output by stereo audio DA transducer 23 again after audio decoder 24 decodings.
Above-mentioned digital technology ANTENN AUDIO dispensing device 100 and ANTENN AUDIO receiving system 200, all adopt special treatment circuit, for example audio coder 14 and audio decoder 24, therefore be difficult to overcome the big problem of operating current, and have that transmission range is short, configuration mode is dumb and function upgrading defective such as difficulty relatively.
Summary of the invention
The object of the invention provides a kind of ANTENN AUDIO emitter, ANTENN AUDIO receiving system, ANTENN AUDIO R-T unit and wireless audio transmission method.The present invention is in order to solve prior art digital technology ANTENN AUDIO dispensing device and ANTENN AUDIO receiving system transmission range is short, configuration mode is dumb and function upgrading difficult technologies defective relatively.
The present invention solves the technical scheme that the prior art problem adopted: a kind of ANTENN AUDIO emitter, it comprises: MCU, stereo audio analog to digital converter ADC, radio circuit, this MCU comprises program storage, this MCU comprises the audio compression encoder, this audio compression encoder is to adopt the software program that is stored in this MCU inside to realize digital audio compression, the digital audio and video signals compressed encoding that the audio compression coded program of this MCU inside receives this stereo audio analog to digital converter ADC is launched after with the digital audio and video signals modulation by this radio circuit.
The further improvement of ANTENN AUDIO emitter of the present invention is: comprise the man-machine interface circuit, this MCU comprises SPI interface, UART interface and the GPIO mouth that is connected with this man-machine interface circuit, by the I of this SPI interface simulation stereo audio analog to digital converter ADC
2The S interface connects the digital audio and video signals that this receipts stereo audio analog to digital converter ADC transmits, and this UART interface is connected between audio compression encoder and the radio circuit, and this radio circuit comprises radio-frequency (RF) transmit-receive circuit and radio frequency PA/LNA.
A kind of ANTENN AUDIO receiving system, it comprises: MCU, stereo audio digital to analog converter DAC, radio circuit, this MCU comprises program storage, this MCU comprises the audio decompression decoder, this audio decompression decoder is realized by the software program of this MCU, this radio circuit with the digital audio and video signals demodulation that receives after, behind audio decoder decode, send this stereo audio digital to analog converter DAC to, digital audio and video signals is changed into simulated audio signal output by this stereo audio digital to analog converter DAC.
The further improvement of ANTENN AUDIO receiving system of the present invention is: comprise the man-machine interface circuit, this MCU comprises GPIO mouth, SPI interface and the UART interface that is connected with this man-machine interface circuit, the I of this SPI interface simulation stereo audio digital to analog converter DAC
2The S interface transmits digital audio and video signals and gives this stereo audio digital to analog converter DAC, and this UART interface is connected between audio decompression encoder and the radio circuit, and this radio circuit comprises radio-frequency (RF) transmit-receive circuit and radio frequency PA/LNA.
A kind of ANTENN AUDIO R-T unit, it comprises: MCU, stereo audio analog to digital converter ADC, stereo audio digital to analog converter DAC and radio-frequency (RF) transmit-receive circuit, this MCU comprises audio compression encoder and audio decompression decoder, this audio compression encoder and audio decompression decoder are to adopt the software program of the inside that is stored in this MCU to realize digital audio compression and decompression, this stereo audio analog to digital converter ADC changes into digital audio and video signals with simulated audio signal, the audio compression coded program of this MCU inside is to this digital audio and video signals compressed encoding, launch after the digital audio and video signals modulation by radio-frequency (RF) transmit-receive circuit, radio-frequency (RF) transmit-receive circuit is under the control of MCU simultaneously, transfer accepting state to from emission state, receive the outside signal that sends over, this radio-frequency (RF) transmit-receive circuit with the digital audio and video signals demodulation that receives after, behind audio decoder decode, send this stereo audio digital to analog converter DAC to, digital audio and video signals is changed into simulated audio signal output by this stereo audio digital to analog converter DAC.
The further improvement of ANTENN AUDIO R-T unit of the present invention is: comprise the radio frequency PA/LNA that is connected with radio-frequency (RF) transmit-receive circuit and the man-machine interface circuit of GPIO mouth, this MCU comprises the GPIO mouth that is connected with this man-machine interface circuit.
The further improvement of ANTENN AUDIO R-T unit of the present invention is: this radio-frequency (RF) transmit-receive circuit is the 2.4G radio-frequency (RF) transceiver.
A kind of wireless audio transmission method comprises the steps:
Step 1: convert simulated audio signal to digital audio and video signals, with I
2The communication mode transmission of digital audio signal of S is encoded and is added communication control information this digital audio and video signals;
Step 2: with this digital audio and video signals modulation back emission carrier signal;
Step 3: the above-mentioned carrier signal of demodulation, back to its decoding with I
2The communication mode transmission of digital audio signal of S converts digital audio and video signals to simulated audio signal output.
The further improvement of wireless audio transmission method of the present invention is: the carrier signal that in the step 2 digital audio and video signals is modulated into 2.4G.
The further improvement of wireless audio transmission method of the present invention is: this carrier signal matches impedance and launches later on by impedance matching network in the step 2.
The invention has the beneficial effects as follows: the processing apparatus that is used as core by powerful MCU, utilize the MCU interface can handle communication and control between various ADC elements and the 2.4GHz modem chip flexibly, and can realize the functions of modules upgrading by very flexible program storage program updates by MCU inside, by the existing man-machine interface of some GPIO causes for gossip of MCU, realize functions such as some external key controls.Before the present invention has realized with software by hardware realize audio coder, therefore, the hardware and software cooperation makes the present invention's different radio circuit of can arranging in pairs or groups, and can accomplish both-way communication, and prior art can't be accomplished.
Description of drawings
Fig. 1 is a kind of electrical block diagram of ANTENN AUDIO emitter of prior art;
Fig. 2 is a kind of electrical block diagram of ANTENN AUDIO receiving system of prior art;
Fig. 3 is the circuit structure block diagram of ANTENN AUDIO dispensing device of the present invention;
Fig. 4 is the circuit structure block diagram of ANTENN AUDIO receiving system of the present invention;
Fig. 5 is the circuit structure block diagram of ANTENN AUDIO R-T unit of the present invention;
Fig. 6 is first kind of execution mode particular circuit configurations schematic diagram of Fig. 3;
Fig. 7 is first kind of execution mode particular circuit configurations schematic diagram of Fig. 4;
Fig. 8 is second kind of execution mode particular circuit configurations schematic diagram of Fig. 3;
Fig. 9 is second kind of execution mode particular circuit configurations schematic diagram of Fig. 4;
Figure 10 is the particular circuit configurations schematic diagram of Fig. 5.
Embodiment
Below in conjunction with the drawings and specific embodiments, further specify the present invention.
Please refer to Fig. 3, is the circuit structure block diagram of ANTENN AUDIO dispensing device of the present invention.This ANTENN AUDIO emitter 300 comprises MCU 31, stereo audio analog to digital converter ADC 33, man-machine interface circuit 36, radio-frequency (RF) transmit-receive circuit 38 and radio frequency PA/LNA 39.This MCU 31 comprises program storage 312, the SPI interface 313 that is connected with this stereo audio analog to digital converter ADC 33, the audio compression encoder 314 that connects this SPI interface 313, GPIO mouth 316 that is connected with this man-machine interface circuit 36 and the UART interface 318 that is connected with audio compression encoder 314, and this UART interface 318 is connected with radio frequency PA/LNA 39 by this radio-frequency (RF) transmit-receive circuit 38.Wherein, this MCU 31 is to be core with single chip computer AT mega48/88/168, and the software program that audio compression encoder 314 adopts ATmega48/88/168 to be stored in program storage 312 inside realizes that this radio-frequency (RF) transmit-receive circuit 38 is 2.4GHz radio-frequency (RF) transceiver.
The course of work of this ANTENN AUDIO R-T unit 300 is: at first from program storage 312 reading systems parameter program is set, finish system initialization work, the stereo sound signal is delivered to stereo audio analog to digital converter ADC 33 by audio interface then, and simulated audio signal is converted to the digital pcm signal.Stereo audio analog to digital converter ADC 33 sends the pcm audio signal to single chip computer AT mega48/88/168 with SPI, and single chip computer AT mega48/88/168 then finishes the reception of pcm audio signal with SPI interface 313.With ATmega48/88/168 is the digital audio and video signals treatment circuit of core, the pcm audio signal is modulated (Adaptive Differential Pulse Code Modulation by adaptive difference pulse code, ADPCM) compression algorithm operation coding, convert the audio signal of ADPCM form to, add some communication protocol control and contact details, packing forms packet by universal asynchronous reception/dispensing device (Universal AsynchronousReceiver/Transmitter, UART) serial ports, promptly this UART interface 318 sends to radio-frequency (RF) transmit-receive circuit 38, by the 2.4GHz radio-frequency (RF) transceiver signal modulate emission after encoding is gone out at last, this MCU 31 can control radio-frequency (RF) transmit-receive circuit 38 and radio frequency PA/LNA 39, change accepting state over to from emission state, receive some outside information; GPIO mouth 316 can connect this man-machine interface circuit 36 or can connect some buttons, realizes some controls of radio-frequency (RF) transmit-receive circuit 38 or MCU 31 operating states.
Please refer to Fig. 4, is the circuit structure block diagram of ANTENN AUDIO receiving system of the present invention.Be used for receiving the carrier signal of Fig. 3 radio-frequency (RF) transmit-receive circuit 38 emissions, this ANTENN AUDIO receiving system 400 comprises MCU 41, stereo audio digital to analog converter DAC 43, man-machine interface circuit 46, radio-frequency (RF) transmit-receive circuit 48 and radio frequency PA/LNA 49.This MCU 41 comprises program storage 412, the GPIO mouth 416 that is connected with this man-machine interface circuit 46, by UART interface 418, audio decompression decoder 414 that connects this UART interface 418 and the SPI interface 413 that is connected this audio decompression decoder 414 that this radio-frequency (RF) transmit-receive circuit 48 is connected with radio frequency PA/LNA 49, this SPI interface 413 is connected with this stereo audio digital to analog converter DAC 43.Wherein, this MCU 41 is single chip computer AT mega48/88/168, and audio decompression decoder 414 adopts the software program of single chip computer AT mega48/88/168 to realize.This radio-frequency (RF) transmit-receive circuit 48 is 2.4GHz radio-frequency (RF) transceiver.This ANTENN AUDIO receiving system 400 is to finish the data transmission interface function by the SPI interface of single chip computer AT mega48/88/168.
The course of work of this ANTENN AUDIO receiving system 400 is: the ATmega48/88/168 treatment circuit is provided with parameter from program storage 412 reading systems earlier, finishes system initialization work.2.4GHz radio-frequency (RF) transceiver receives the carrier signal of radio-frequency (RF) transmit-receive circuit 38 emissions among Fig. 3, the data demodulates of packet is come out, the packet that demodulation is come out with UART interface 418 sends to ATmega48/88/168 digital audio and video signals treatment circuit, and the ATmega48/88/168 treatment circuit is isolated ADPCM signal and other control signals from the packet the inside; MCU 41 treatment circuits further restore pcm encoder with the ADPCM signal by the computing of ADPCM decoding algorithm.Again by SPI interface 413 Simulation with I
2S interface communication mode is delivered to stereo audio digital to analog converter DAC 43 with the pcm audio signal, converts simulated audio signal output to.MCU 41 can control radio-frequency (RF) transmit-receive circuit 48 and radio frequency PA/LNA 49, changes accepting state over to from emission state, receives some outside information; GPIO mouth 416 can connect this man-machine interface circuit 46 or can connect some buttons, realizes some controls to radio-frequency (RF) transmit-receive circuit 48 or MCU 41 operating states.
Please refer to Fig. 5, is the circuit structure block diagram of ANTENN AUDIO R-T unit of the present invention.This ANTENN AUDIO R-T unit 500 comprise as shown in Figure 3 ANTENN AUDIO emitter 300 and ANTENN AUDIO receiving system 400 as shown in Figure 4.Emitter in this ANTENN AUDIO R-T unit 500 partly comprises MCU 31, stereo audio analog to digital converter ADC 33, man-machine interface circuit 36, radio-frequency (RF) transmit-receive circuit 38 and radio frequency PA/LNA39.This MCU 31 comprises program storage 312, the SPI interface 313 that is connected with this stereo audio analog to digital converter ADC 33, the audio compression encoder 314 that connects this SPI interface 313, GPIO mouth 316 that is connected with this man-machine interface circuit 36 and the UART interface 318 that is connected with audio compression encoder 314, and this UART interface 318 is connected with radio frequency PA/LNA 39 by this radio-frequency (RF) transmit-receive circuit 38; Receiving system in this ANTENN AUDIO R-T unit 500 partly comprises MCU 41, stereo audio digital to analog converter DAC 43, man-machine interface circuit 46, radio-frequency (RF) transmit-receive circuit 48 and radio frequency PA/LNA 49.This MCU 41 comprises program storage 412, the GPIO mouth 416 that is connected with this man-machine interface circuit 46, by UART interface 418, audio decompression decoder 414 that connects this UART interface 418 and the SPI interface 413 that is connected this audio decompression decoder 414 that this radio-frequency (RF) transmit-receive circuit 48 is connected with radio frequency PA/LNA 49, this SPI interface 413 is connected with this stereo audio digital to analog converter DAC 43.Wherein, this MCU 31 and MCU 41 are same MCU, and radio-frequency (RF) transmit-receive circuit 38 and radio frequency PA/LNA39 transfer accepting state to from emission state under the control of MCU31, and promptly radio-frequency (RF) transmit-receive circuit 48 and radio frequency PA/LNA49 receive the outside signal that sends over.
Please refer to Fig. 6, is first kind of execution mode particular circuit configurations schematic diagram of Fig. 3.Power supply chip LP2980 reduces to 3.3V output with the 5V direct voltage, supplies with the ANTENN AUDIO emitter; Stereo simulated audio signal is input to 23 and 24 pin of AD conversion chip WM8951L.Cooperatively interact between 12,13,16 and 17 pin by ATmega48/88/168, WM8951L finishes stereosonic sample conversion work, with the digital audio and video signals of PCM form with I
2The S communication mode is delivered to ATmega48/88/168; ATmega48/88/168 becomes the ADPCM form with the audio signal compression of PCM form, add some communication control informations and be packaged into packet, coordination control by ATmega48/88/168 chip 11 pin and 14 pin, the SPI serial ports of nRF24L01 and 30 pin of ATmega48/88/168 and 31 pin are set up data exchange channel, finish the data information transfer between ATmega48/88/168 and the nRF24L01.NRF24L01 is modulated into the carrier wave of 2.4GHz with data message, by impedance matching network, launches by antenna after matching impedance.
Please refer to Fig. 7, is first kind of execution mode particular circuit configurations schematic diagram of Fig. 4.Power supply chip RT9193 reduces to 3.3V output with the 5V direct voltage, supplies with the ANTENN AUDIO receiving system; 2.4GHz radio-frequency (RF) transceiver chip nRF24L01 comes out the 2.4GHz wireless signal demodulation that antenna receives, under the control of ATmega48/88/168 chip 11 pin and 14 pin, the SPI serial ports of nRF24L01 and 30 pin of ATmega48/88/168 and 31 pin are set up data exchange channel, finish the data information exchange between nRF24L01 and the ATmega48/88/168, stereosonic digital audio and video signals is delivered to ATmega48/88/168.ATmega48/88/168 will unpack from the stereo digital audio-frequency data bag that nRF2401 passes over, and take out voice data, the voice data of ADPCM form be de-compressed into the voice data of PCM form, by 12,13,15 of ATmega48/88/168, cooperatively interact between 17 pin, with I
2The S communication mode is delivered to DA conversion chip WM8714 with decoded PCM signal; WM8714 becomes the simulated audio signal of left and right acoustic channels to export from 6 pin and 9 pin of WM8714 respectively the PCM conversion of signals.
Please refer to Fig. 8, is second kind of execution mode particular circuit configurations schematic diagram of Fig. 3.Power supply chip LP2980 reduces to 3.3V output with the 5V direct voltage, supplies with the ANTENN AUDIO emitter; Analog stereo signal is delivered to the 23rd, 24 pin of WM8951L by filter network.Cooperatively interact between 12,13,16 and 17 pin by ATmega48/88/168, WM8951L finishes stereosonic sample conversion work, with the digital audio and video signals of PCM form with I
2The S communication mode is delivered to ATmega48/88/168; ATmega48/88/168 becomes the ADPCM form with the audio signal compression of PCM form, add some communication control informations and be packaged into packet, coordination control by ATmega48/88/168 chip 11 pin and 14 pin, the SPI serial ports of nRF24L01 and 30 pin of ATmega48/88/168 and 31 pin are set up data exchange channel, finish the data information transfer between ATmega48/88/168 and the nRF24L01.NRF24L01 is modulated into the carrier wave of 2.4GHz with data message, by impedance matching network, launches by antenna after matching resistance.
In the circuit function design of present embodiment, keep the input circuit of No. two microphones.One road microphone signal is input to the 22nd pin of WM8951, forms the PCM signal by inner sampling processing; To be voice signal deliver to 10 pin of ATmega48/88/168 later on by filter network with the input circuit of No. the second microphone, and ATmega48/88/168 carries out the PWM modulation to this signal, forms digital audio and video signals.NRF24L01 is delivered in this two-way microphone input signal sampling or be modulated into after the digital audio and video signals, and nRF24L01 is modulated into the carrier wave of 2.4GHz with data message, by impedance matching network, launches by antenna after matching resistance.
Please refer to Fig. 9, is second kind of execution mode particular circuit configurations schematic diagram of Fig. 4.
Power supply chip LP2980 reduces to 3.3V output with the 5V direct voltage, supplies with the ANTENN AUDIO receiving system.2.4GHz modem chip nRF24L01 comes out the 2.4GHz wireless signal demodulation that antenna receives, under the control of ATmega48/88/168 chip 11 pin and 14 pin, the SPI serial ports of nRF24L01 and 30 pin of ATmega48/88/168 and 31 pin are set up data exchange channel, finish the data information exchange between nRF24L01 and the ATmega48/88/168, stereosonic digital audio and video signals is delivered to ATmega48/88/168.ATmega48/88/168 will unpack from the stereo digital audio-frequency data bag that nRF2401 passes over, take out voice data, the voice data of ADPCM form is de-compressed into the voice data of PCM form, cooperatively interact between 12,13,15 and 17 pin by ATmega48/88/168, with I
2The S communication mode is delivered to DA conversion chip WM8731 with decoded PCM signal; WM8731 becomes the simulated audio signal of left and right acoustic channels to export from 13 pin and 14 pin of WM8731 respectively the PCM conversion of signals.
The input circuit that keeps No. one microphone is gone up in this circuit function design.Microphone signal is input to the 22nd pin of WM8731, forms the PCM signal by inner sampling processing; Control the ADPCM condensing routine interface that is sent to ATmega48/88/168 inside by ATmega48/88/168, form ADPCM signal data bag and send to nRF24L01, after the nRF24L01 modulation, launch by antenna.
Please refer to Figure 10, is the particular circuit configurations schematic diagram of Fig. 5.Power supply chip LP2980 reduces to 3.3V output with the 5V direct voltage, supplies with the ANTENN AUDIO transmission/reception; Stereo simulated audio signal is input to 23,24 pin of AD conversion chip WM8951L.Cooperatively interact between 12,13,16 and 17 pin by ATmega48/88/168, WM8951L finishes stereosonic sample conversion work, with the digital audio and video signals of PCM form with I
2The S communication mode is delivered to ATmega48/88/168; ATmega48/88/168 becomes the ADPCM form with the audio signal compression of PCM form, add some communication control informations and be packaged into packet, coordination control by ATmega48/88/168 chip 11 pin and 14 pin, the SPI serial ports of nRF24L01 and 30 pin of ATmega48/88/168 and 31 pin are set up data exchange channel, finish the data information transfer between the ATmega48/88/168nRF24L01.NRF24L01 and UPG2214 and integrated power amplify chip T7024 and form the 2.4GHz radio-frequency (RF) transmit-receive circuit.Switch chip UPG2214 U3, UPG2214 U5 and T7024 chip transmit and receive the 9th foot control system that state is subjected to ATmega48/88/168, after the 9th pin output control signal of ATmega48/88/168 is isolated by R11 and R10, be connected to the state control signal port of UPG2214 U3, UPG2214 U5 and T7024, finish reception/emission operating state conversion.
Under emission state: this moment, ATmega48/88/168 transmitted control signal nRF24L01, UPG2214 and T7024 are set in after the emission state, nRF24L01 is modulated into the carrier wave of 2.4GHz with data message, by impedance matching network, delivers to the 5th pin of electronic switch UPG2214 U3, export from the 3rd pin, deliver to the 20th pin of T7024, big by the integrated amplifier granting later on from the output of 11 pin, deliver to the 1st pin of UPG2214 U5, deliver to antenna from the output of the 5th pin, launch by antenna.
Under accepting state: this moment, ATmega48/88/168 transmitted control signal nRF24L01, UPG2214 and T7024 are set in after the accepting state, the 2.4GHz wireless signal that antenna receives is sent to the 5th pin of UPG2214 U5, be sent to the 7th pin of T7024 after the 3rd pin output, after the 2.4GHz amplifier amplification by T7024 inside, be sent to the 1st pin of UPG2214 U3 from the 1st pin output of T7024, the 5th pin output from UPG2214, be sent to the 12nd, 13 pin of nRF24L01 by impedance matching network; NRF24L01 comes out the demodulation of 2.4GHz carrier signal, forms the adpcm data bag, delivers to ATmega48/88/168 by the SPI serial ports.Finish data analysis by ATmega48/88/168, and the Adjustment System operating state.
The present invention relatively flexibly, can select different ADC elements for use on circuit arrangement, dispose different 2.4GHz radio-frequency (RF) transceiver.The ADC element WM8739 of the actual employing of the present invention, WM8751, WM8714, WM8731, WM8711; 2.4GHz the chip model of radio-frequency (RF) transceiver has nRF2401A, nRF24L01; According to the demand of project, the radio circuit that adopts nRF24L01 and T7024 to cooperate realizes that the frequency hopping mode transmits and receives.In addition, the chip model of 2.4GHz radio-frequency (RF) transceiver of the present invention is not limited to: nRF2401A, nRF24L01, CC2500 and CC1100 can also comprise other radio frequency chips.The ADC/DAC element is not limited to WM8739, WM8951, WM8731 and WM8714, can also comprise other etc.The present invention not only can be used for music transmission, can also be used for two-way communication fields such as voice transfer.In addition, radio-frequency (RF) transmit-receive circuit of the present invention can be the 2.4G radio-frequency (RF) transceiver, can also be the radio-frequency (RF) transceiver of other frequency ranges.
ANTENN AUDIO emission of the present invention, reception, R-T unit are used as the processing apparatus of core by powerful MCU.Utilize the MCU interface can handle communication and control between various ADC elements and the 2.4GHz modem chip flexibly, and can realize the functions of modules upgrading very flexibly by the MCU program updates.By the existing man-machine interface of some GPIO causes for gossip of MCU, realize functions such as some external key controls.Before the present invention has realized with software by hardware realize audio coder, therefore, the hardware and software cooperation makes the present invention's different radio circuit of can arranging in pairs or groups, and can accomplish both-way communication, and prior art can't be accomplished.
ANTENN AUDIO transmitting device provided by the present invention, ANTENN AUDIO emitter and ANTENN AUDIO receiving system are described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. ANTENN AUDIO emitter, it comprises: MCU, stereo audio analog to digital converter ADC, radio circuit, this MCU comprises program storage, it is characterized in that: this MCU comprises the audio compression encoder, this audio compression encoder is to adopt the software program that is stored in this MCU inside to realize digital audio compression, the digital audio and video signals compressed encoding that the audio compression coded program of this MCU inside receives this stereo audio analog to digital converter ADC is launched after with the digital audio and video signals modulation by this radio circuit.
2. ANTENN AUDIO emitter as claimed in claim 1, it is characterized in that: comprise the man-machine interface circuit, this MCU comprises SPI interface, UART interface and the GPIO mouth that is connected with this man-machine interface circuit, by the I of this SPI interface simulation stereo audio analog to digital converter ADC
2The S interface receives the digital audio and video signals that this receipts stereo audio analog to digital converter ADC transmits, and this UART interface is connected between audio compression encoder and the radio circuit, and this radio circuit comprises radio-frequency (RF) transmit-receive circuit and radio frequency PA/LNA.
3. ANTENN AUDIO receiving system, it comprises: MCU, stereo audio digital to analog converter DAC, radio circuit, this MCU comprises program storage, it is characterized in that: this MCU comprises the audio decompression decoder, this audio decompression decoder is realized by the software program of this MCU, this radio circuit with the digital audio and video signals demodulation that receives after, behind audio decoder decode, send this stereo audio digital to analog converter DAC to, digital audio and video signals is changed into simulated audio signal output by this stereo audio digital to analog converter DAC.
4. ANTENN AUDIO receiving system as claimed in claim 3 is characterized in that: comprise the man-machine interface circuit, this MCU comprises GPIO mouth, SPI interface and the UART interface that is connected with this man-machine interface circuit, the I of this SPI interface simulation stereo audio digital to analog converter DAC
2The S interface transmits digital audio and video signals and gives this stereo audio digital to analog converter DAC, and this UART interface is connected between audio decompression encoder and the radio circuit, and this radio circuit comprises radio-frequency (RF) transmit-receive circuit and radio frequency PA/LNA.
5. ANTENN AUDIO R-T unit, it comprises: MCU, stereo audio analog to digital converter ADC, stereo audio digital to analog converter DAC and radio-frequency (RF) transmit-receive circuit, it is characterized in that: this MCU comprises audio compression encoder and audio decompression decoder, this audio compression encoder and audio decompression decoder are to adopt the software program of the inside that is stored in this MCU to realize digital audio compression and decompression, this stereo audio analog to digital converter ADC changes into digital audio and video signals with simulated audio signal, the audio compression coded program of this MCU inside is to this digital audio and video signals compressed encoding, launch after the digital audio and video signals modulation by radio-frequency (RF) transmit-receive circuit, radio-frequency (RF) transmit-receive circuit is under the control of MCU simultaneously, transfer accepting state to from emission state, receive the outside signal that sends over, this radio-frequency (RF) transmit-receive circuit with the digital audio and video signals demodulation that receives after, behind audio decoder decode, send this stereo audio digital to analog converter DAC to, digital audio and video signals is changed into simulated audio signal output by this stereo audio digital to analog converter DAC.
6. ANTENN AUDIO emitter as claimed in claim 5 is characterized in that: comprise the radio frequency PA/LNA that is connected with radio-frequency (RF) transmit-receive circuit and the man-machine interface circuit of GPIO mouth, this MCU comprises the GPIO mouth that is connected with this man-machine interface circuit.
7. ANTENN AUDIO emitter as claimed in claim 5 is characterized in that: this radio-frequency (RF) transmit-receive circuit is the 2.4G radio-frequency (RF) transceiver.
8. a wireless audio transmission method is characterized in that, comprises the steps:
Step 1: convert simulated audio signal to digital audio and video signals, with I
2The communication mode transmission of digital audio signal of S is encoded and is added communication control information this digital audio and video signals;
Step 2: with this digital audio and video signals modulation back emission carrier signal;
Step 3: the above-mentioned carrier signal of demodulation, back to its decoding with I
2The communication mode transmission of digital audio signal of S converts digital audio and video signals to simulated audio signal output.
9. wireless audio transmission method as claimed in claim 8 is characterized in that: the carrier signal that in the step 2 digital audio and video signals is modulated into 2.4G.
10. wireless audio transmission method as claimed in claim 8 is characterized in that: comprise in the step 2 that this carrier signal by impedance matching network, matches impedance and launches later on.
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| CN102571127A (en) * | 2010-12-22 | 2012-07-11 | 钰宝科技股份有限公司 | Wireless audio frequency transmitting-receiving device and wireless audio frequency transmission method |
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| CN104700838A (en) * | 2013-12-09 | 2015-06-10 | 国民技术股份有限公司 | Multi-carrier audio communication processing method, multi-carrier audio communication processing system and audio receiving end equipment |
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Application publication date: 20090520 |