CN115276707A - 2.4G wireless digital audio transmission circuit - Google Patents
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- CN115276707A CN115276707A CN202210892340.4A CN202210892340A CN115276707A CN 115276707 A CN115276707 A CN 115276707A CN 202210892340 A CN202210892340 A CN 202210892340A CN 115276707 A CN115276707 A CN 115276707A
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/16—Vocoder architecture
- G10L19/18—Vocoders using multiple modes
- G10L19/24—Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a 2.4G wireless digital audio transmission circuit, which comprises a power management module, a Codec module, a main control module, a first 2.4G radio frequency module and a second 2.4G radio frequency module, wherein a true diversity system is formed by adopting two completely independent 2.4G radio frequency modules, so that the problems of fading and multipath of radio frequency signals in a real environment are effectively solved, the phenomena of frequency interruption, sound interruption and the like in wireless audio transmission are avoided, and the transmission distance of digital audio signals is increased. Meanwhile, on the basis of a true diversity physical architecture, a transmission control channel and an audio data transmission channel are completely independent, and the problem of interference of a digital pilot channel to tone quality in a traditional FM mode is solved, so that the tone quality is improved. Compared with other wireless digital audio transmission circuits, the circuit adopts an ADPCM coding small frame mode with 4ms audio duration as one frame, not only reduces the wireless transmission bandwidth requirement, but also reduces the time delay to the level which can be accepted by 4ms professional audio.
Description
Technical Field
The invention relates to the technical field of wireless audio transmission, in particular to a 2.4G wireless digital audio transmission circuit.
Background
Today, with the advancement of electronic science and technology, and especially with the rapid development of radio frequency integrated circuit technology, more and more radio signals are filling the whole space. No matter the mobile phone, the computer, the Bluetooth headset or more and more intelligent household appliances in the home use the originally scarce radio frequency spectrum space, and some intelligent water meters and intelligent electric meters also use the radio technology to transmit data. In this time of spectral reduction, there are more and more programs and activities that desire more wireless devices to transmit audio signals, and the demand for wireless channels is constantly rising at the hundreds of places.
The transmission of audio signals gradually evolves from a wired transmission mode to a transmission mode mainly based on wireless transmission, and the storage and transmission of digital audio signals gradually transition from analog signals to digital signals. At present, the lossless audio quality of 44.1kHz and 16-bit CD is popular, while the sampling rate of music with CD quality is usually 1.4Mbps, and obviously, on the premise of ensuring the stability and real-time performance of signals, the transmission rate of digital audio data with 1.4Mbps brings huge challenges to the wireless transmission task. Since 1948, american scientist Claude Shannon (Claude Elwood Shannon, 1916-2001) deduced the limit information transmission rate of a channel with limited bandwidth and gaussian white noise interference using the theory of information theory, wireless digital communication technology has gone through several technical iterations.
Currently, the universal short-distance communication technologies include bluetooth, WIFI, zigbee, Z-wave, 3G, 4G, 5G, LIFI, and the like, and the wireless communication protocols all belong to wireless digital communication technologies. Among them, only bluetooth is used for real-time professional digital audio transmission, and the products are typically TWS, bluetooth speaker and broadcast audio, which are popular in recent years. LE Audio published by SIG organization (SIG for short) in 1 month and 6 days of 2020 is the next generation Bluetooth wireless Audio transmission technology, and besides a new Audio transmission mechanism is defined in the data stream level by LE Audio, LC3 Audio compression technology with richer compression rate and audibility is adopted to replace SBC and mSBC Audio compression technology of traditional Bluetooth, and the time delay is reduced from 22ms to 12.5ms in real time. Although the parameters and performance of LE Audio have been greatly improved in various aspects compared with conventional bluetooth, the minimum 12.5ms delay of bluetooth Audio and the impairment of LC3 lossy compression to the sound quality and hearing sense still result in that the bluetooth Audio technology is still not acceptable in most professional Audio application fields. Because the market potential of wireless audio is huge, international chip leadership TI proposes a CC85xx series chip which is a product specially aiming at the field of wireless audio, in practical application, the CC85xx series can meet the application field of wireless audio at a fixed position, and the phenomenon of sound interruption often appears in the application field of mobile wireless audio.
Disclosure of Invention
In view of the above technical drawbacks and practical needs, it is an object of the present invention to provide a 2.4G wireless digital audio transmission circuit, which employs a modular frame, so that both the receiving and transmitting terminals can share one circuit board, and the same circuit is used, thereby effectively reducing the number of materials to be produced and optimizing inventory management. Meanwhile, the circuit of the invention adopts a true diversity mode, and effectively solves the phenomena of frequency interruption and sound interruption in wireless audio transmission.
In order to achieve the above objects and other related objects, the present invention adopts the following technical solutions:
A2.4G wireless digital audio transmission circuit comprises: the system comprises a power management module, a Codec module, a main control module, a first 2.4G radio frequency module and a second 2.4G radio frequency module;
the power management module is used for power management of the whole circuit and respectively provides power for the Codec module, the main control module, the 2.4G radio frequency module I and the 2.4G radio frequency module II;
the Codec module is provided with an I2S interface and is used for converting an analog audio electric signal into a digital signal and transmitting the digital signal to the main control module through the I2S interface or converting audio data received by the I2S interface into an analog audio signal and outputting the analog audio signal;
the main control module is provided with an I2S interface, an SPI1 interface and an SPI2 interface, and is used for outputting digital audio data received by the I2S interface to the 2.4G radio frequency module II after being subjected to ADPCM coding, or is used for outputting carrier data received by the SPI2 interface to the Codec module after being subjected to ADPCM coding, or is used for switching between a receiving mode and a transmitting mode, or is used for transmitting and receiving commands from the SPI1 interface and executing the commands;
the 2.4G radio frequency module I is provided with an SPI interface, and the 2.4G radio frequency module I is used for sending out a command through the radio frequency interface after receiving the command from the SPI interface or sending out the command from the SPI interface after receiving the command from the radio frequency interface;
the 2.4G radio frequency module II is provided with an SPI interface, and the 2.4G radio frequency module II is used for sending out audio data through the radio frequency interface after receiving the audio data from the SPI interface, or sending out the audio data from the SPI interface after receiving the audio data from the radio frequency interface.
Optionally, the power management module is provided with an input port P1 and a +3V3 output port, where the input port P1 is a +5V power input, and the +3V3 output port is connected to the Codec module, the main control module, the first 2.4G radio frequency module, and the second 2.4G radio frequency module.
Optionally, the Codec module is further provided with a power input interface, an AD interface J1, and a DA interface J2; the AD interface J1 is connected to an external analog audio input, and the DA interface J2 is connected to an external analog audio output.
Optionally, the main control module is further provided with a power input interface and a transmitting and receiving switching interface S1; an SPI1 interface of the main control module is connected to the first 2.4G radio frequency module, and an SPI2 interface of the main control module is connected to the second 2.4G radio frequency module; the transmitting and receiving switching interface S1 is used for setting the main control module to operate in a transmitting mode or a receiving mode.
Optionally, the Codec module and the main control module are further provided with an I2C interface respectively, and the I2C interface of the Codec module is connected to the I2C interface of the main control module; and the I2S interface of the Codec module is connected to the I2S interface of the main control module.
Optionally, the MCU firmware on the main control module includes: an ADPCM encoder, an ADPCM decoder, and a downsampler.
Optionally, the first 2.4G radio frequency module is provided with a power interface and a radio frequency interface, and the carrier frequency range is as follows: 2400MHz to 2483MHz, power range is: -20dBm to +20dBm.
Optionally, the 2.4G radio frequency module ii is provided with a power interface and a radio frequency interface, and the carrier frequency range is as follows: 2400MHz to 2483MHz, power range is: -20dBm to +20dBm.
Optionally, when the board is laid, the physical distance between the first 2.4G radio frequency module and the second 2.4G radio frequency module is greater than 5cm.
The invention has the beneficial effects that: the circuit of the invention adopts a modular frame, so that two receiving and transmitting ends can share one circuit board, and the same circuit is used, thereby effectively reducing the number of produced materials and optimizing the inventory management. The circuit of the invention adopts two completely independent 2.4G radio frequency modules to form a true diversity system, effectively solves the problems of fading and multipath of radio frequency signals in a real environment, avoids the phenomena of frequency interruption, sound interruption and the like in wireless audio transmission, and increases the transmission distance of digital audio signals. Meanwhile, on the basis of a true diversity physical architecture, a transmission control channel and an audio data transmission channel are completely independent, and the problem of interference of a digital pilot channel to tone quality in a traditional FM mode is solved, so that the tone quality is improved. Compared with other wireless digital audio transmission circuits, the circuit adopts an ADPCM coding small frame mode with 4ms audio duration as one frame, not only reduces the wireless transmission bandwidth requirement, but also reduces the time delay to the level which can be accepted by 4ms professional audio. In addition, the invention can achieve the effect similar to the spread spectrum technology by the technology of dynamically adjusting the code rate through the RSSI value of the data transmission channel, thereby ensuring the stability of audio transmission.
Drawings
Fig. 1 is a schematic block diagram of a 2.4G wireless digital audio transmission circuit.
Fig. 2 is an overall circuit diagram of a 2.4G wireless digital audio transmission circuit.
Fig. 3 is a circuit diagram of a power management module of a 2.4G wireless digital audio transmission circuit.
Fig. 4 is a circuit diagram of a main control module and its interface of a 2.4G wireless digital audio transmission circuit.
Fig. 5 is a Codec module of a 2.4G wireless digital audio transmission circuit and an interface circuit diagram thereof.
Fig. 6 is a first 2.4G rf module of a 2.4G wireless digital audio transmission circuit and an interface circuit diagram thereof.
Fig. 7 is a second 2.4G rf module of a 2.4G wireless digital audio transmission circuit and an interface circuit diagram thereof.
Wherein the figures are identified as follows:
1-power management module, 2-Codec module,
3-a main control module, 4-a 2.4G radio frequency module I,
and 5-2.4G radio frequency module II.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are given by way of illustration only.
In the description of the present invention, it should be noted that, unless otherwise specifically stated or limited, the term "connected" means that the related elements are electrically connected according to their inherent characteristics and logic relationship of the scheme for the technical purpose of the present invention, and may be directly connected or indirectly connected through an intermediate medium. The specific meanings of the terms in the present specification in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 7, an embodiment of the present invention provides a 2.4G wireless digital audio transmission circuit, including: the system comprises a power management module 1, a Codec module 2, a main control module 3, a 2.4G radio frequency module I4 and a 2.4G radio frequency module II 5;
the power management module 1 is used for power management of the whole circuit and respectively provides power for the Codec module 2, the main control module 3, the 2.4G radio frequency module I4 and the 2.4G radio frequency module II 5;
the Codec module 2 is provided with an I2S interface, and the Codec module 2 is configured to convert an analog audio electrical signal into a digital signal and transmit the digital signal to the main control module 3 through the I2S interface, or is configured to convert audio data received by the I2S interface into an analog audio signal and output the analog audio signal;
the main control module 3 is provided with an I2S interface, an SPI1 interface and an SPI2 interface, and the main control module 3 is used for carrying out ADPCM coding on digital audio data received by the I2S interface and then outputting the digital audio data to the 2.4G radio frequency module II 5, or is used for carrying out ADPCM coding on carrier data received by the SPI2 interface and then outputting the carrier data to the Codec module 2, or is used for switching between a receiving mode and a transmitting mode, or is used for transmitting and receiving commands from the SPI1 interface and executing the commands;
the 2.4G radio frequency module I4 is provided with an SPI interface, and the 2.4G radio frequency module I4 is used for sending out a command through the radio frequency interface after receiving the command from the SPI interface or sending out the command from the SPI interface after receiving the command from the radio frequency interface;
the second 2.4G radio frequency module 5 is provided with an SPI interface, and the second 2.4G radio frequency module 5 is used for sending out audio data through the radio frequency interface after receiving the audio data from the SPI interface, or sending out the audio data from the SPI interface after receiving the audio data from the radio frequency interface.
In an embodiment, the power management module 1 is provided with an input port P1 and a +3V3 output port, where the input port P1 is a +5V power input, the capacitor C9 is used to filter a high-frequency signal of the +5V power input, the +3V3 output port is connected to the Codec module 2, the main control module 3, the first 2.4G radio frequency module 4 and the second 2.4G radio frequency module 5, and the capacitor C8 connected in parallel to the +3V3 network is used to filter a high-frequency signal of the +3V3 network, so as to ensure stability and cleanness of the +3V3 power network. The Codec module 2 is provided with a power input interface, an AD interface J1, a DA interface J2, an I2C interface and an I2S interface, the AD interface J1 is connected to an external analog audio input, the DA interface J2 is connected to an external analog audio output, the I2C interface of the Codec module 2 is connected to the I2C interface of the main control module 3, the I2C interface of the Codec module 2 is used for the main control configuration and the control of the working state of the Codec module 2, the I2S interface of the Codec module 2 is connected to the I2S interface of the main control module 3, the I2S interface of the Codec module 2 is used for transmitting digital audio data, the resistors R2 and R3 are input offset resistors of left and right microphone channels respectively, and the capacitors C6 and C5 are input filter capacitors of the left and right microphone channels respectively and used for filtering out direct current signals. During operation, the Codec module 2 is configured to convert an analog audio electrical signal into a digital signal and transmit the digital signal to the main control module 3 through an I2S interface of the Codec module 2, or is configured to convert audio data received by the I2S interface of the Codec module 2 into an analog audio signal and output the analog audio signal. Master control module 3 is equipped with power input interface, I2C interface, I2S interface, SPI1 interface, SPI2 interface and transmission and reception switching interface S1, and this I2S interface connection is in Codec module 2 'S I2S interface, this SPI1 interface connection are in 2.4G radio frequency module 4, this SPI2 interface connection are in 2.4G radio frequency module two 5, transmission and reception switching interface S1 are used for setting up master control module 3 works in transmission mode or receiving mode, and condenser C3 is used for filtering chip U4 working power supply' S clutter, and resistor R1 is used for restricting the irritated electric current of NRST pin on the chip U4. The MCU firmware on the main control module 3 comprises: an ADPCM encoder, an ADPCM decoder, and a down sampler. When the device works, the main control module 3 is used for performing ADPCM coding on digital audio data received by an I2S interface of the main control module 3 and then outputting the digital audio data to the second 2.4G radio frequency module 5, or used for performing ADPCM coding on carrier data received by an SPI2 interface of the main control module 3 and then outputting the carrier data to the Codec module 2, or used for switching between a receiving mode and a transmitting mode, or used for transmitting and receiving commands from an SPI1 interface and executing the commands. 2.4G radio frequency module 4 is equipped with power source, radio frequency interface and an SPI interface, and crystal oscillator Y1 is used for providing the oscillation source of chip U2's 24HMz, and condenser C1 and inductor L1 constitute impedance matching network for connect chip U2 radio frequency output to radiation antenna E1, the carrier frequency range is: 2400MHz to 2483MHz, power range is: -20dBm to +20dBm. When the 2.4G radio frequency module I4 works, the 2.4G radio frequency module I4 is used for sending out a command through the radio frequency interface after receiving the command from the SPI interface of the 2.4G radio frequency module I4, or sending out the command from the SPI interface of the 2.4G radio frequency module I4 after receiving the command from the radio frequency interface. 2.4G radio frequency module two 5 is equipped with power source, radio frequency interface and an SPI interface, and crystal oscillator Y2 is used for providing chip U3's 24 HMz's oscillation source, and condenser C2 and inductor L2 constitute impedance matching network for connect chip U3 radio frequency output to radiation antenna E2, the carrier frequency range is: 2400MHz to 2483MHz, power range is: -20dBm to +20dBm. When the 2.4G radio frequency module II 5 works, the 2.4G radio frequency module II 5 is used for sending out the audio data through the radio frequency interface after receiving the audio data from the SPI interface of the 2.4G radio frequency module II 5, or sending out the audio data from the SPI interface of the 2.4G radio frequency module II 5 after receiving the audio data from the radio frequency interface. When the board is arranged, the physical interval between the 2.4G radio frequency module I4 and the 2.4G radio frequency module II 5 is larger than 5cm.
The invention has the beneficial effects that: the circuit of the invention adopts a modular frame, so that two receiving and transmitting ends can share one circuit board, and the same circuit is used, thereby effectively reducing the number of produced materials and optimizing the inventory management. The circuit of the invention adopts two completely independent 2.4G radio frequency modules to form a true diversity system, effectively solves the problems of fading and multipath of radio frequency signals in a real environment, avoids the phenomena of frequency interruption, sound interruption and the like in wireless audio transmission, and increases the transmission distance of digital audio signals. Meanwhile, on the basis of a true diversity physical architecture, a transmission control channel and an audio data transmission channel are completely independent, and the problem of interference of a digital pilot channel to tone quality in a traditional FM mode is solved, so that the tone quality is improved. Compared with other wireless digital audio transmission circuits, the circuit adopts an ADPCM coding small frame mode with 4ms audio duration as one frame, not only reduces the wireless transmission bandwidth requirement, but also reduces the time delay to the level which can be accepted by 4ms professional audio. In addition, the invention can achieve the effect similar to the spread spectrum technology by the technology of dynamically adjusting the code rate through the RSSI value of the data transmission channel, thereby ensuring the stability of audio transmission.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and embellishments can be made without departing from the principle of the present invention, and these modifications and embellishments should also be regarded as the protection scope of the present invention.
Claims (9)
1. A2.4G wireless digital audio transmission circuit is characterized by comprising: the system comprises a power management module, a Codec module, a main control module, a first 2.4G radio frequency module and a second 2.4G radio frequency module;
the power management module is used for power management of the whole circuit and respectively provides power for the Codec module, the main control module, the 2.4G radio frequency module I and the 2.4G radio frequency module II;
the Codec module is provided with an I2S interface and is used for converting an analog audio electric signal into a digital signal and transmitting the digital signal to the main control module through the I2S interface or converting audio data received by the I2S interface into an analog audio signal and outputting the analog audio signal;
the main control module is provided with an I2S interface, an SPI1 interface and an SPI2 interface, and is used for outputting digital audio data received by the I2S interface to the 2.4G radio frequency module II after being subjected to ADPCM coding, or is used for outputting carrier data received by the SPI2 interface to the Codec module after being subjected to ADPCM coding, or is used for switching between a receiving mode and a transmitting mode, or is used for transmitting and receiving commands from the SPI1 interface and executing the commands;
the 2.4G radio frequency module I is provided with an SPI interface, and the 2.4G radio frequency module I is used for sending out a command through the radio frequency interface after receiving the command from the SPI interface or sending out the command from the SPI interface after receiving the command from the radio frequency interface;
the 2.4G radio frequency module II is provided with an SPI interface, and the 2.4G radio frequency module II is used for sending out audio data through the radio frequency interface after receiving the audio data from the SPI interface, or sending out the audio data from the SPI interface after receiving the audio data from the radio frequency interface.
2. The 2.4G wireless digital audio transmission circuit according to claim 1, wherein the power management module has an input port P1 and a +3V3 output port, wherein the input port P1 is a +5V power input, and the +3V3 output port is connected to the Codec module, the main control module, the first 2.4G RF module and the second 2.4G RF module.
3. The 2.4G wireless digital audio transmission circuit according to claim 1, wherein the Codec module is further provided with a power input interface, an AD interface J1, and a DA interface J2; the AD interface J1 is connected to an external analog audio input, and the DA interface J2 is connected to an external analog audio output.
4. A 2.4G wireless digital audio transmission circuit according to claim 3, wherein the main control module is further provided with a power input interface and a transmitting-receiving switching interface S1; an SPI1 interface of the main control module is connected to the first 2.4G radio frequency module, and an SPI2 interface of the main control module is connected to the second 2.4G radio frequency module; the transmitting and receiving switching interface S1 is used for setting the main control module to operate in a transmitting mode or a receiving mode.
5. The 2.4G wireless digital audio transmission circuit according to claim 4, wherein the Codec module and the main control module are further provided with I2C interfaces respectively, and the I2C interface of the Codec module is connected to the I2C interface of the main control module; and the I2S interface of the Codec module is connected to the I2S interface of the main control module.
6. The 2.4G wireless digital audio transmission circuit according to claim 1, wherein the MCU firmware on the main control module comprises: an ADPCM encoder, an ADPCM decoder, and a down sampler.
7. The 2.4G wireless digital audio transmission circuit according to claim 1, wherein the first 2.4G radio frequency module is provided with a power interface and a radio frequency interface, and the carrier frequency range is: 2400MHz to 2483MHz, the power range is: -20 to +20dBm.
8. The 2.4G wireless digital audio transmission circuit according to claim 1, wherein the 2.4G radio frequency module II is provided with a power interface and a radio frequency interface, and the carrier frequency range is as follows: 2400MHz to 2483MHz, the power range is: -20dBm to +20dBm.
9. The 2.4G wireless digital audio transmission circuit according to claim 1, wherein, when the circuit is laid, the physical distance between the first 2.4G radio frequency module and the second 2.4G radio frequency module is greater than 5cm.
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