CN206164761U - General digital walkie -Talkie radio frequency SOC chip - Google Patents
General digital walkie -Talkie radio frequency SOC chip Download PDFInfo
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Abstract
The utility model discloses a general digital walkie -Talkie radio frequency SOC chip, including adopting the low intermediate frequency mirror image of a frequency conversion to suppress the receive channel of structure, adopt the transmission passageway of directly modulated structure, with receive channel and the digital signal processing module DSP that all is connected of transmission passageway, the pronunciation codec CODEC who is connected with digital signal processing module DSP, speech input channel and the speech output passageway all be connected with pronunciation codec CODEC, and be connected and carry out data interchange's digital interface module with outside microprocessor MCU with data signal module DSP. The utility model discloses with complicated, messy, bulky device and general baseband data processing module DSP effective integration at chip, realize that high -performance data signal handles and receiving and dispatching, only need the outside general microprocessor MCU of lift -launch realize digital walkie -Talkie communication protocol with keyboard -display control can accomplish the complete function of digital walkie -Talkie, external design is more simple for messenger's intercom to can conveniently realize DA compatibility communication.
Description
Technical field
The utility model is related to intercom technical field, is to be related to a kind of general digital intercom radio frequency SOC specifically
Chip.
Background technology
Intercom as professional GSM one of visual plant, in industrial enterprise, government, public safety and its
The Internal Command scheduling of hetero-organization department, rescue and relief work emergency communication and commander, playing in the urgent accident of process can not
The effect of replacement, it has also become national security, public security police, traffic administration, petrochemical industry, construction, machine-building, property are protected
The important wireless communication apparatus of An Deng departments.
With the continuous development of electronics, computer technology and digitizing technique, wireless tranceiver also there occurs a day crescent
Different change, simulation is conventional and simulation cluster intercom has been switched on the digitized epoch.Digital handset and traditional analog pair
The machine of saying is compared with unrivaled performance advantage, but the cost of digital handset is relatively high.In conventional digital pair
In saying machine scheme, using hundreds of discrete devices and general digital process chip, integrated level is low, and power consumption is high, and PCB sizes are big, cloth
Office is difficult, disturbs big between radio frequency, digital module, and development difficulty is big, and uniformity is poor, needs substantial amounts of debugging efforts, leads
Digital handset cost is caused to remain high.
The radio frequency analog part of intercom such as low noise is amplified, is mixed twice, narrow-band filtering, and the circuit such as audio frequency process needs to account for
Accumulated with larger PCB surface, and debug complicated, to production and quality control extreme difficulties are brought；Therefore in digital handset chip
In, the design and realization of the radio frequency transceiver simultaneously SOC of integrated Base-Band Processing are one of key technologies, the special SOC of radio frequency
The factors such as performance, cost, the integrated level of chip all directly affect the cost and performance of whole digital handset system.Rui Di sections
The repertoire of the AT1847 integrated chips of Microtronics A/S simulation FM intercoms, but for should during digital handset
Chip can be only done basic analog signal Up/Down Conversion function, and the not 4FSK modulation /demodulation to digital baseband signal is processed,
Not to the process of transceiving data frame, the coding to voice signal and decoding (CODEC) are not completed yet, therefore the chip is also needed
The general digital signal processor (DSP) of carrying completes Base-Band Processing and audio coding decoding could realize complete digital handset
Function.In order to overcome the deficiencies in the prior art, the utility model by advanced radio frequency SOC manufacturing technology it is complicated, zero
Disorderly, bulky device and general base band data process chip (DSP) effective integration realizes high performance numeral in chip internal
Signal transacting and transmitting-receiving, only need the outside general purpose microprocessor (MCU) that carries to realize digital handset communication protocol and keyboard ＆ display
Control can complete digital handset complete function, make intercom design more and more simple and reliable, and can conveniently realize that digital-to-analogue is simultaneous
Hold communication.
Utility model content
To overcome the problems referred to above of the prior art, it is few, low in energy consumption, integrated that the utility model provides a kind of peripheral component
Degree is high, performance is strong, low cost, the general digital intercom radio frequency SOC of miniaturization.
To achieve these goals, the technical solution adopted in the utility model is as follows：
A kind of general digital intercom radio frequency SOC, including connecing using single-conversion Low Medium Frequency image rejection structure
Passage is received, using the transmission channel of directly modulation structure, the Digital Signal Processing mould being all connected with receiving channel and transmission channel
Block DSP, the audio coder ＆ decoder (codec) CODEC being connected with digital signal processing module DSP, is connected with audio coder ＆ decoder (codec) CODEC
Speech input channel and voice output passage, and be connected with data signal module DSP and carry out with external microprocessor MCU
The digital interface module of data exchange, wherein, speech input channel accesses microphone signal, and voice output passage sends voice letter
Number, receiving channel and transmission channel are input into and export radiofrequency signal by external antenna.
Further, the receiving channel includes the low-noise amplifier LNA of incoming radio frequency signal, receives low noise amplification
The quadrature frequency conversion frequency mixer Mixer of the quadrature radio-frequency signals of device LNA outputs, is connected with quadrature frequency conversion frequency mixer Mixer
Mirror image suppresses bandpass filter IR, the variable gain amplifier that the orthogonal signalling to suppressing bandpass filter IR through mirror image are processed
VGA, and the radio frequency analog signal that variable gain amplifier VGA is exported is converted to into the number to digital signal processing module output
The receiving channel A-D converter ADC1 of word signal.First radiofrequency signal carried out into low noise amplification during reception, then passed through
Quadrature frequency conversion is converted to low intermediate frequency signal, fractional frequency synthesizer of the local oscillation signal needed for down coversion in transmission channel
PLL, intermediate-freuqncy signal is suppressed after bandpass filter filtering interference signals by variable gain amplifier using automatic again by mirror image
Gain control mechanism AGC is amplified, and is then converted to digital medium-frequency signal by A-D converter, is sent to Digital Signal Processing
Module DSP carries out the demodulation process of baseband signal.
Further, the transmission channel includes FM/FSK/4FSK modulators, the fractional frequency synthesizer being sequentially connected
PLL and power amplifier driving stage PAdriver, wherein, FM/FSK/4FSK modulators are received and modulated at data signal
The signal to be sent of reason module DSP, power amplifier driving stage PAdriver is by output after signal to be sent amplification to outside；Institute
State fractional frequency synthesizer PLL and also receive external crystal-controlled oscillation signal and to receiving channel output difference local oscillation signal.
Specifically, the fractional frequency synthesizer PLL include by voltage controlled oscillator VCO, prescalar Prescaler,
The decimal distribution that programmable frequency divider PScounter, phase frequency detector PFD, charge pump CP and CP2 and loop filter are constituted
Phase-locked loop structures, the sigma-delta modulator being connected with programmable frequency divider PScounter, and be connected with voltage controlled oscillator VCO
Crystal oscillator active circuit, wherein, phase frequency detector PFD also receives reference signal Fref, and sigma-delta modulator receives fractional frequency division letter
Number.
During transmitting work, baseband signal is adjusted by FM/FSK/4FSK modulators to the ∑-Δ of fractional frequency synthesizer PLL
Device processed carries out frequency modulation(PFM), and the rf modulated signal for obtaining is exported by VCO, is then amplified by power amplifier driving stage
Afterwards output is to chip exterior.
Further, the digital signal processing module DSP include be connected with each other digital medium-frequency signal filtration module,
Signal power detection module RSSI, automatic growth control modules A GC, auto frequency deviation control module AFC, FM/FSK4FSK demodulator
With packet handing module PacketHandler, wherein, from receiving channel digital medium-frequency signal Jing digital medium-frequency signals filter mould
After block filtering, demodulated by FM/FSK4FSK demodulators and exported to audio coder ＆ decoder (codec) CODEC；Signal power detection module is to solution
Signal after tune detected, as a result acts on AGC and AFC, automatic growth control modules A GC to LNA in receiving channel,
Mixer and VGA generation effect, auto frequency deviation control module AFC acts on receiving channel.When work is received, by corresponding
Module carries out the channel filtering of digital medium-frequency signal and demodulation, and being then sent through CODEC carries out audio frequency process, and FSK/4FSK demodulation is believed
Number then carry out clock and data recovery and produce binary code stream, then carry out the inspection of lead code Preamble through packet handing module
The operations such as survey, synchronization character detection and CRC check produce corresponding interrupt signal, and valid data are sent into into order caching device
RXFIFO is stored；Detection signal power RSSI is also needed to while signal demodulation is completed for DSP and centre frequency is cheap, inspection
Survey result and act on automatic growth control modules A GC and auto frequency deviation control module AFC, automatic growth control module is by control
The gain of receiving channel modules (such as LNA, Mixer and VGA) realizes that auto frequency deviation control module is by controlling fractional frequency
The sigma-delta modulator of synthesizer PLL is realized.During transmitting work, the packet with sending is by packet handing module from transmitting buffer
Read in TXFIFO, then adding to be sent in DSP after lead code Preamble, synchronization character and CRC check word carries out shaping filter,
Finally it is sent in the FM/FSK/4FSK modulators of transmission channel and is modulated transmitting.
Specifically, the speech input channel includes accessing the input amplifier AMP1 of microphone signal, amplifies with input
The A-D converter ADC2 that device AMP1 connects and is connected with audio coder ＆ decoder (codec) CODEC, and from input amplifier AMP1 outputs
The voice activation detection circuit VOX of end collection signal.
Also, the voice output passage includes the digital-to-analog converter DAC being connected with audio coder ＆ decoder (codec) CODEC, and
It is connected with digital-to-analog converter DAC and exports the output amplifier AMP2 of voice signal to outside loudspeaker.
, when work is received, external microprocessor MCU is according to communication protocol by the receiving data bag of chip for digital handset
In the voice signal that recovers the audio coder ＆ decoder (codec) of chip internal is sent to by digital interface DI (Digital Interface)
CODEC carries out audio decoder, and decoded signal is converted to analog signal by output amplifier AMP2 through digital-to-analog converter DAC
Loudspeaker playback is sent to after being amplified；During digital handset transmitting work, microphone signal is put by input amplifier AMP1
Greatly, then digital audio and video signals are converted to by A-D converter ADC2, being sent in audio coder ＆ decoder (codec) CODEC carries out audio frequency volume
Code, the audio signal after coding is sent in external microprocessor MCU by digital interface DI and carries out voice packet according to communication protocol
Framing processing and transmitting operation.The voice activation detection circuit VOX included in speech input channel, for microphone voice
Signal is detected and is produced interrupt signal, to realize the voice activation call function of intercom.
Further, the digital interface module includes that the reception being connected with packet handing module PacketHandler is delayed
Storage RXFIFO and transmitting buffer TXFIFO, and with order caching device RXFIFO and launch buffer TXFIFO and be all connected with
Digital interface DI, wherein, audio coder ＆ decoder (codec) CODEC also carries out data friendship by digital interface DI and external microprocessor MCU
Change process.Order caching device RXFIFO is used to store the packet that baseband digital signal processing module DSP is received, transmitting caching
Device TXFIFO is used to store the transmitting packet that outside MCU sends, and digital interface DI passes through interrupt signal, serial ports and universal I/O port
The exchange of transceiving data bag, audio coding decoding data and outside MCU is completed, while completing to chip internal by SPI interface
Configuration.
Compared with prior art, the utility model has the advantages that：
The utility model exists complicated, messy, bulky device and general base band data processing module DSP effective integration
Chip internal, realizes high performance Digital Signal Processing and transmitting-receiving, only needs the outside general purpose microprocessor MCU that carries to realize that numeral is right
Digital handset complete function is completed by saying machine communication protocol and Keyboard and display control, makes intercom exterior design more simple
Single, and can conveniently realize that DA compatibility communicates, its design structure is ingenious, is monolithically fabricated more succinct, low in energy consumption, integrated level is high,
Performance is strong, low cost, miniaturization, be with a wide range of applications, be adapted to popularization and application.
Description of the drawings
Fig. 1 is structured flowchart of the present utility model.
Fig. 2 is the structured flowchart of decimal frequency synthesizer in the utility model.
Specific embodiment
With reference to the accompanying drawings and examples the utility model is described in further detail, and embodiment of the present utility model includes
But it is not limited to the following example.
Embodiment
As shown in Figure 1 to Figure 2, general digital intercom radio frequency SOC, including using the suppression of single-conversion Low Medium Frequency mirror image
The receiving channel of structure processed, using the transmission channel of directly modulation structure, the numeral being all connected with receiving channel and transmission channel
Signal processing module DSP, the audio coder ＆ decoder (codec) CODEC being connected with digital signal processing module DSP, and audio coder ＆ decoder (codec)
CODEC connection speech input channel and voice output passage, and be connected with data signal module DSP and with outside microprocessor
Device MCU carries out the digital interface module of data exchange, wherein, speech input channel accesses microphone signal, voice output passage
Voice signal is sent, receiving channel and transmission channel are input into and export radiofrequency signal by external antenna.
Further, the receiving channel includes the low-noise amplifier LNA of incoming radio frequency signal, receives low noise amplification
The quadrature frequency conversion frequency mixer Mixer of the quadrature radio-frequency signals of device LNA outputs, is connected with quadrature frequency conversion frequency mixer Mixer
Mirror image suppresses bandpass filter IR, the variable gain amplifier that the orthogonal signalling to suppressing bandpass filter IR through mirror image are processed
VGA, and the radio frequency analog signal that variable gain amplifier VGA is exported is converted to into the number to digital signal processing module output
The receiving channel A-D converter ADC1 of word signal.
Further, the transmission channel includes FM/FSK/4FSK modulators, the fractional frequency synthesizer being sequentially connected
PLL and power amplifier driving stage PAdriver, wherein, FM/FSK/4FSK modulators are received and modulated at data signal
The signal to be sent of reason module DSP, power amplifier driving stage PAdriver is by output after signal to be sent amplification to outside；Institute
State fractional frequency synthesizer PLL and also receive external crystal-controlled oscillation signal and to receiving channel output difference local oscillation signal.
Specifically, the fractional frequency synthesizer PLL include by voltage controlled oscillator VCO, prescalar Prescaler,
The decimal distribution that programmable frequency divider PScounter, phase frequency detector PFD, charge pump CP and CP2 and loop filter are constituted
Phase-locked loop structures, the sigma-delta modulator being connected with programmable frequency divider PScounter, and be connected with voltage controlled oscillator VCO
Crystal oscillator active circuit, wherein, phase frequency detector PFD also receives reference signal Fref, and sigma-delta modulator receives fractional frequency division letter
Number.
Further, the digital signal processing module DSP include be connected with each other digital medium-frequency signal filtration module,
Signal power detection module RSSI, automatic growth control modules A GC, auto frequency deviation control module AFC, FM/FSK4FSK demodulator
With packet handing module PacketHandler, wherein, from receiving channel digital medium-frequency signal Jing digital medium-frequency signals filter mould
After block filtering, demodulated by FM/FSK4FSK demodulators and exported to audio coder ＆ decoder (codec) CODEC；Signal power detection module is to solution
Signal after tune detected, as a result acts on AGC and AFC, automatic growth control modules A GC to LNA in receiving channel,
Mixer and VGA generation effect, auto frequency deviation control module AFC acts on receiving channel.Specifically, the speech input is logical
Road includes accessing the input amplifier AMP1 of microphone signal, is connected with input amplifier AMP1 and and audio coder ＆ decoder (codec)
The A-D converter ADC2 of CODEC connections, and gather the voice activation detection electricity of signal from input amplifier AMP1 output ends
Road VOX.
Also, the voice output passage includes the digital-to-analog converter DAC being connected with audio coder ＆ decoder (codec) CODEC, and
It is connected with digital-to-analog converter DAC and exports the output amplifier AMP2 of voice signal to outside loudspeaker.
Further, the digital interface module includes that the reception being connected with packet handing module PacketHandler is delayed
Storage RXFIFO and transmitting buffer TXFIFO, and with order caching device RXFIFO and launch buffer TXFIFO and be all connected with
Digital interface DI, wherein, audio coder ＆ decoder (codec) CODEC also carries out data friendship by digital interface DI and external microprocessor MCU
Change process.Order caching device RXFIFO is used to store the packet that baseband digital signal processing module DSP is received, transmitting caching
Device TXFIFO is used to store the transmitting packet that outside MCU sends, and digital interface DI passes through interrupt signal, serial ports and universal I/O port
The exchange of transceiving data bag, audio coding decoding data and outside MCU is completed, while completing to chip internal by SPI interface
Configuration.
The utility model can be used for simulating (FM) intercom in the application, both, it is also possible to for digital handset
(4FSK)。
When analog-interphone is applied to, the receiving channel of chip will carry out FM demodulation after RF carrier wave signal down coversion, turn
Voice signal is changed into RF carrier wave by chemical conversion voice signal, transmission channel through FM modulation, and highly integrated SOC is only needed to
One MCU and a little piece external component are capable of achieving analog-interphone function.During reception, receiving channel first carries out radiofrequency signal low
Noise amplifies, and is then converted to low intermediate frequency signal through quadrature frequency conversion, and the local oscillation signal needed for down coversion is by transmission channel
Fully integrated fractional frequency synthesizer PLL produce, intermediate-freuqncy signal again by mirror image suppression bandpass filter filtering interference signals with
It is amplified using automatic growth control AGC mechanism by variable gain amplifier VGA afterwards, then by high-precision analog to digital conversion
Device ADC1 is converted to digital medium-frequency signal, and being sent to baseband digital signal processing module DSP carries out channel filtering and FM demodulation, demodulation
The audio signal for going out is sent to encoding and decoding speech CODEC and isolates voice signal and sub-audio signal, wherein language through digital filtering
Message number postemphasised, expand after analog signal is converted to by digital-to-analog converter DAC, then entered by audio amplification block
Row is sent to loudspeaker playback after amplifying, and sub-audio signal then obtains infrasonic signaling (CTCSS/CDCSS) by filtering and detection
It is used for noise elimination (SQ) and Control on Communication with dtmf signal；Baseband digital signal processing module completes also to be needed while signal is demodulated
Detection signal power RSSI and carrier deviation, testing result is wanted to be used for automatic growth control modules A GC and auto frequency deviation control
Molding block AFC, automatic growth control realizes that auto frequency deviation control is by control by the gain of control receiving channel modules
The sigma_delta modulators of fractional frequency synthesizer PLL are realized.During transmitting, audio processing modules first produce microphone
Signal through amplification and voice activation detection (VOX) after carry out analog to digital conversion (ADC) and be converted to digital audio and video signals, then
Being sent to encoding and decoding speech (CODEC) carries out digital filtering, compression, preemphasis process, then adds sub-audio signal (CTCSS/
CDCSS baseband digital signal processing module) and after DTMF is sent to, then by FM/FSK/4FSK modulators to fractional frequency
The sigma-delta modulator of synthesizer carries out FM modulation, and the radio frequency FM signals for obtaining are exported by VCO, is then driven by power amplifier
Chip exterior is arrived in output after dynamic level PAdriver is amplified.
When digital handset is applied to, the radio-frequency receiving-transmitting partial function and analog-interphone all fours of chip are received
The low-noise amplifier of passage, quadrature down converter, fractional frequency synthesizer, mirror image suppress bandpass filter, variable gain to put
Big device VGA, analog-digital converter ADC1 complete to receive radiofrequency signal to the conversion of digital medium-frequency signal；The fractional frequency of transmission channel
Synthesizer PLL and radio-frequency power amplifier driving stage complete the 4FSK modulation for launching digital baseband signal and export radio-frequency modulations letter
Number power amplification.The maximum difference of digital handset pattern and analog-interphone pattern is the process part of data signal,
During chip reception state, the digital medium-frequency signal for receiving is carried out into channel by baseband digital signal processing module DSP first
Filtering and the demodulation of 4FSK signals, and complete clock and data recovery (CDR) the generation binary code stream of receiving data, Ran Houjing
Crossing packet handing module PacketHandler carries out the operation generations such as the detection of lead code Preamble, synchronization character detection and CRC check
Corresponding interrupt signal, and valid data feeding order caching device RXFIFO is stored, while producing outside interrupt notification piece
MCU reads the data in order caching device and carries out the frame process of digital interphone communication agreement, MCU roots by digital interface DI
The voice signal recovered according to agreement carries out audio frequency solution by the audio coder ＆ decoder (codec) CODEC that digital interface DI is sent to chip internal
Code, is then converted to through digital-to-analog converter DAC and loudspeaker playback is sent to after analog signal is amplified；During chip emission state, Mike
The signal that wind is produced carries out A-D converter ADC2 and is converted to DAB after amplifying and voice activation detects circuit VOX
Signal, being then delivered to audio coder ＆ decoder (codec) CODEC carries out audio coding, and the audio signal after coding is sent to by digital interface DI
The Frame Protocol for carrying out launching voice packet according to digital handset agreement in the outer MCU of piece is processed, and then will launch frame data by number
Word interface DI writes the transmitting buffer TXFIFO of chip internal, and chip internal packet handing module PacketHandler reads and sends out
The data penetrated in buffer TXFIFO simultaneously are added as needed on being sent to after lead code Preamble and synchronization character and CRC check word
FM/FSK/4FSK modulator blocks carry out 4FSK modulation to the ∑-△ modulators of fractional frequency synthesizer, the radio-frequency modulations for obtaining
Signal is exported by VCO, and output is to chip exterior after being then amplified by power amplifier driving stage PAdriver.
Digital handset chip also supports the data receiver of FSK modulation mode and transmitting, and its principle and flow process are believed with 4FSK
Number reception transmitting it is identical.
Above-described embodiment is only preferred embodiment of the present utility model, not to the restriction of the utility model protection domain,
In every case design principle of the present utility model, and the change for carrying out non-creativeness work on this basis and making are adopted, all should
Belong within protection domain of the present utility model.
Claims (8)
1. a kind of general digital intercom radio frequency SOC, it is characterised in that include suppressing using single-conversion Low Medium Frequency mirror image
The receiving channel of structure, using the transmission channel of directly modulation structure, the numeral letter being all connected with receiving channel and transmission channel
Number processing module DSP, the audio coder ＆ decoder (codec) CODEC being connected with digital signal processing module DSP, and audio coder ＆ decoder (codec)
CODEC connection speech input channel and voice output passage, and be connected with data signal module DSP and with outside microprocessor
Device MCU carries out the digital interface module of data exchange, wherein, speech input channel accesses microphone signal, voice output passage
Voice signal is sent, receiving channel and transmission channel are input into and export radiofrequency signal by external antenna.
2. a kind of general digital intercom radio frequency SOC according to claim 1, it is characterised in that the reception is led to
Road includes the low-noise amplifier LNA of incoming radio frequency signal, is receiving the quadrature radio-frequency signals of low-noise amplifier LNA outputs just
Down-conversion mixer Mixer is handed over, the mirror image being connected with quadrature frequency conversion frequency mixer Mixer suppresses bandpass filter IR, to passing through
Mirror image suppresses the variable gain amplifier VGA that the orthogonal signalling of bandpass filter IR are processed, and by variable gain amplifier VGA
The radio frequency analog signal of output is converted to the receiving channel A-D converter of the data signal to digital signal processing module output
ADC1。
3. a kind of general digital intercom radio frequency SOC according to claim 1, it is characterised in that the transmitting is led to
Road includes FM/FSK/4FSK modulators, fractional frequency synthesizer PLL and the power amplifier driving stage being sequentially connected
PAdriver, wherein, FM/FSK/4FSK modulators receive and modulate the signal to be sent from digital signal processing module DSP,
Power amplifier driving stage PAdriver is by output after signal to be sent amplification to outside；The fractional frequency synthesizer PLL is also
Receive external crystal-controlled oscillation signal and to receiving channel output difference local oscillation signal.
4. a kind of general digital intercom radio frequency SOC according to claim 3, it is characterised in that the decimal frequency
Rate synthesizer PLL is included by voltage controlled oscillator VCO, prescalar Prescaler, programmable frequency divider PScounter, frequency discrimination
The decimal distribution phase-locked loop structures that phase discriminator PFD, charge pump CP and CP2 and loop filter are constituted, with programmable frequency divider
The sigma-delta modulator of PScounter connections, and the crystal oscillator active circuit being connected with voltage controlled oscillator VCO, wherein, frequency discrimination mirror
Phase device PFD also receives reference signal Fref, and sigma-delta modulator receives fractional frequency division signal.
5. a kind of general digital intercom radio frequency SOC according to any one of Claims 1 to 4, it is characterised in that institute
Stating speech input channel includes accessing the input amplifier AMP1 of microphone signal, is connected with input amplifier AMP1 and and voice
The A-D converter ADC2 of codec CODEC connections, and swash from the voice of input amplifier AMP1 output ends collection signal
Biopsy slowdown monitoring circuit VOX.
6. a kind of general digital intercom radio frequency SOC according to claim 5, it is characterised in that the voice is defeated
Go out the digital-to-analog converter DAC that passage includes being connected with audio coder ＆ decoder (codec) CODEC, and be connected with digital-to-analog converter DAC and to
Outside loudspeaker export the output amplifier AMP2 of voice signal.
7. a kind of general digital intercom radio frequency SOC according to any one of claim 2～4, it is characterised in that institute
State digital signal processing module DSP include be connected with each other digital medium-frequency signal filtration module, signal power detection module RSSI,
Automatic growth control modules A GC, auto frequency deviation control module AFC, FM/FSK4FSK demodulator and packet handing module
PacketHandler, wherein, from receiving channel digital medium-frequency signal Jing digital medium-frequency signal filtration module filtering after, by
FM/FSK4FSK demodulators are demodulated and exported to audio coder ＆ decoder (codec) CODEC；Signal power detection module is to the signal after demodulation
Detected, as a result act on AGC and AFC, automatic growth control modules A GC is produced to LNA, Mixer and VGA in receiving channel
Raw effect, auto frequency deviation control module AFC acts on receiving channel.
8. a kind of general digital intercom radio frequency SOC according to claim 7, it is characterised in that the numeral connects
Mouth mold block includes the order caching device RXFIFO being connected with packet handing module PacketHandler and transmitting buffer
TXFIFO, and digital interface DI being all connected with order caching device RXFIFO and transmitting buffer TXFIFO, wherein, voice coder
Decoder CODEC also carries out data exchange processing by digital interface DI and external microprocessor MCU.
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| CN201621054646.9U CN206164761U (en) | 2016-09-14 | 2016-09-14 | General digital walkie -Talkie radio frequency SOC chip |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107171686A (en) * | 2017-05-26 | 2017-09-15 | 泉州力同科技有限公司 | A kind of integrated talkback chip and digital handset |
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| CN110011685A (en) * | 2018-01-03 | 2019-07-12 | 立积电子股份有限公司 | Radio frequency signal processing equipment |
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| CN114257692A (en) * | 2020-09-25 | 2022-03-29 | 力同科技股份有限公司 | Communication equipment and method |
| CN115102543A (en) * | 2022-08-26 | 2022-09-23 | 天津七一二移动通信有限公司 | High-performance 4FSK modulation circuit and implementation method |
| CN115102543B (en) * | 2022-08-26 | 2023-01-03 | 天津七一二移动通信有限公司 | High-performance 4FSK modulation circuit and implementation method |
| WO2024051393A1 (en) * | 2022-09-05 | 2024-03-14 | 深圳市Tcl云创科技有限公司 | Audio circuit, circuit board and electronic device |
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