CN112865829A - Full-duplex interphone and implementation method thereof - Google Patents
Full-duplex interphone and implementation method thereof Download PDFInfo
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- CN112865829A CN112865829A CN202011587703.0A CN202011587703A CN112865829A CN 112865829 A CN112865829 A CN 112865829A CN 202011587703 A CN202011587703 A CN 202011587703A CN 112865829 A CN112865829 A CN 112865829A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W4/08—User group management
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention relates to a method for realizing a full-duplex interphone, which comprises the following steps: A. setting a digital baseband unit, a receiving radio frequency channel and an audio channel; B. analyzing the user information and the signal parameters of the received digital signal; C. when the PTT is detected to be pressed down, judging whether the interphone still receives normal conversation information; D. setting a digital baseband unit, an audio channel, a transmitting radio frequency channel and a receiving radio frequency channel; E. performing transmission in a duplex state; F. judging whether the PTT is loosened; G. judging whether the received signal in the duplex state disappears; H. setting a digital baseband unit, an audio channel, a receiving radio frequency channel and a transmitting radio frequency channel; I. judging whether a duplex call reply is received; J. it is determined whether the PTT is released. The invention also provides a full duplex interphone. The invention can realize that both sides can receive and send information at the same time, meets the requirement of simultaneous and synchronous conversation of both sides, and improves the use experience of users.
Description
Technical Field
The invention relates to a full-duplex interphone and an implementation method thereof.
Background
The interphone is a wireless communication terminal device capable of carrying out point-to-multipoint communication, can enable a plurality of people to listen to the speaking content of the same person at the same time, has the characteristics of timely communication, one-to-one correspondence, economy and practicality, low operation cost, no consumption of communication cost and the like, and also has the functions of group calling broadcasting, system calling, confidential calling and the like. When handling emergency, the role of the system in dispatching command can not be replaced by other communication tools.
The existing interphone is based on a half-duplex mechanism, only one party is allowed to speak at the same time, the interphone cannot receive external signals while sending signals, correspondingly, the interphone cannot send signals while receiving signals, the user experience is reduced to a certain extent, and the urgent requirement that two parties synchronously communicate at the same time cannot be met.
Disclosure of Invention
The invention aims to provide a full-duplex interphone and a realization method thereof aiming at the defects of the prior art, and based on a full-duplex mechanism, the two parties can receive and send information at the same time, so that the requirement of simultaneous and synchronous conversation between the two parties is met, and the use experience of a user is improved.
The invention is realized by the following technical scheme:
a method for realizing a full-duplex interphone comprises the following steps:
A. the microprocessor sets the digital baseband unit to work in a duplex state, sets the receiving radio frequency channel to work in an on receiving state, sets the audio frequency channel to be in a standby closing state, and makes the interphone be in a duplex standby state;
B. after the receiving radio frequency channel receives the digital signal, the microprocessor of the interphone analyzes the user information and the signal parameters of the signal, displays the information which is stored in the interphone and related to the user information, and plays the communication voice;
C. when the microprocessor detects that the PTT is pressed down, the microprocessor judges whether the interphone still receives normal conversation information, if so, the step D is carried out; otherwise, entering step H;
D. the microprocessor sets a transmitting state of the digital baseband unit working in a duplex state, sets a state of an audio channel working in a state of simultaneously starting a loudspeaker and a microphone, and sets a state of alternately starting receiving and transmitting work of a transmitting radio frequency channel and a receiving radio frequency channel working in the duplex state;
E. executing the transmission in the duplex state, and entering the step F;
F. judging whether the PTT is loosened, if so, entering the step A; otherwise, entering step G;
G. judging whether the received signal in the duplex state disappears, if so, entering a step H; otherwise, entering step E;
H. setting a simplex transmitting state of the digital baseband unit in a duplex state by the microprocessor, setting an audio channel in a state of closing a loudspeaker and opening a microphone, and setting a state of closing a receiving radio frequency channel and keeping opening a transmitting radio frequency channel in the duplex state, and entering the step I;
I. d, judging whether a duplex call reply is received, if so, entering the step D; otherwise, entering step J;
J. judging whether the PTT is loosened, if so, entering the step A; otherwise, go to step H.
Further, the user information and signal parameters in step B include a user ID, a call color code, and a call timeslot.
Furthermore, the audio channel comprises a transmitting audio channel and a receiving audio channel, and the transmitting audio channel comprises a microphone and an audio coding and decoding unit which are connected in sequence; the receiving audio channel comprises an audio coding and decoding unit, an audio power amplifier unit and a loudspeaker which are connected in sequence.
Furthermore, the transmitting radio frequency channel comprises an audio coding and decoding unit, an external clock circuit, a transmitting radio frequency unit, a power amplifying circuit, a receiving and transmitting switch circuit and an antenna which are connected in sequence; the receiving radio frequency channel comprises an antenna, a receiving and transmitting switch circuit, a receiving frequency selection circuit, a receiving radio frequency unit and an audio coding and decoding unit which are connected in sequence.
Further, the step C specifically includes: and judging whether the DMR signal is continuously received and the tail frame is not received, if so, judging that the interphone still receives normal call information, and otherwise, judging that the interphone does not receive the normal call information.
Further, the step D specifically includes: the digital baseband unit works in a duplex state and comprises the following steps: the audio encoding and decoding unit allows an input microphone signal to simultaneously start SPK output, the digital baseband unit outputs received voice data to the audio encoding and decoding unit while inputting the microphone signal, and sets the states of receiving and transmitting alternate start work of the transmitting radio frequency channel and the receiving radio frequency channel under duplex, specifically: the microprocessor is initialized to control the closing of the output of the transmitting radio frequency channel, the closing of the input of the receiving radio frequency channel, the control of the output or the input of the transmitting radio frequency channel by detecting the DMR signal which is output by the digital baseband unit and jumps once by 30Ms, the opening of the output of the transmitting radio frequency channel when the DMR signal rises, the closing of the input of the receiving radio frequency channel, the closing of the output of the transmitting radio frequency channel when the DMR signal falls, the opening of the input of the receiving radio frequency channel, and the realization of the state of alternate work of receiving and transmitting under the duplex state.
Further, in step G, when the received signal continuously receives the voice frame and the superframe, it is determined that the received signal in the duplex state does not disappear, and when the received signal receives the end frame, it is determined that the received signal in the duplex state is ended.
Further, the step I specifically includes: and the digital baseband unit returns the current CALL TYPE according to the received DMR signal, and judges that a CALL reply in a DUPLEX state is received when a digital CALL is received during transmission and the returned CALL TYPE is CALL _ TYPE _ DUPLEX _ VOICE.
The invention is also realized by the following technical scheme:
the interphone based on any one of the full-duplex talkback realization methods comprises an antenna, a transceiving switch circuit, a microprocessor, a digital baseband unit, a key unit, a power amplification circuit, a transmitting radio frequency unit, an external clock circuit, an audio coding and decoding unit, a microphone, an audio power amplifier unit, a loudspeaker, a receiving frequency selection circuit and a receiving radio frequency unit, wherein the microphone is connected with a first input end of the audio decoding unit to form a transmitting audio channel; the first output end of the audio coding and decoding unit is connected with the input end of the audio power amplifier unit, and the loudspeaker is connected with the output end of the audio power amplifier unit to form a received audio channel; the second output end of the audio coding and decoding unit is connected with the input end of an external clock circuit, the output end of the external clock circuit, the transmitting radio frequency unit, the power amplifying circuit, the receiving and transmitting switch circuit and the switch are sequentially connected to form a transmitting radio frequency channel; the antenna, the receiving and transmitting switch circuit, the receiving frequency selection circuit and the receiving radio frequency unit input end are sequentially connected, and the receiving radio frequency unit output end is connected with the second input end of the audio decoding unit to form a receiving radio frequency channel; the transmitting radio frequency unit, the receiving radio frequency unit and the digital baseband unit are respectively connected with the microprocessor in a bidirectional mode, and the audio coding and decoding unit is connected with the digital baseband unit in a bidirectional mode.
The invention has the following beneficial effects:
1. the digital baseband unit, the transmitting radio frequency channel, the receiving radio frequency channel and the audio channel are arranged in different working states, and are matched with the action signal of the PTT and the analysis of the received signal, so that a full duplex mechanism is realized, both the receiving and sending of information can be realized at the same time, the requirement of simultaneous and synchronous conversation between both the receiving and sending parties is met, and the use experience of a user is improved; when the received duplex signal disappears, the digital baseband unit is set to work in a simplex transmitting state under the duplex state, the audio channel is set to work in a state of closing the loudspeaker and opening the microphone, the receiving radio frequency channel is set to be closed under the duplex state, and the state of opening the transmitting radio frequency channel is kept, so that the interphone is in a state of receiving the duplex signal while transmitting the simplex signal, thereby realizing that the simplex transmission can be carried out, and the interphone can be rapidly switched to the transmission under the duplex state after receiving the duplex signal again, reducing the time spent on switching, and enriching the functions of the interphone.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic block diagram of an intercom of the present invention.
FIG. 2 is a flow chart of a method for implementing the present invention.
Wherein, 1, an antenna; 2. a transmit-receive switch circuit; 3. a microprocessor; 4. a digital baseband unit; 5. a key unit; 6. a microphone; 7. an audio encoding and decoding unit; 8. an external clock circuit; 9. a transmitting radio frequency unit; 10. a power amplification circuit; 11. a receiving frequency-selecting circuit; 12. a receiving radio frequency unit; 13. an audio power amplifier unit; 14. a loudspeaker.
Detailed Description
As shown in fig. 1, the interphone based on the full-duplex intercom implementation method includes an antenna 1, a transceiver switch circuit 2, a microprocessor, a digital baseband unit 4, a key unit 5, a microphone 6, an audio codec unit 7, an external clock circuit 8, a transmitting radio frequency unit 9, a power amplification circuit 10, a receiving frequency selection circuit 11, a receiving radio frequency unit 12, an audio power amplifier unit 13, and a speaker 14, wherein the microphone 6 is connected with a first input end of the audio codec unit to form a transmitting audio channel; the first output end of the audio coding and decoding unit 7 is connected with the input end of the audio power amplifier unit 13, and the loudspeaker 14 is connected with the output end of the audio power amplifier unit 13 to form a receiving audio channel; the second output end of the audio coding and decoding unit 7 is connected with the input end of an external clock circuit 8, the output end of the external clock circuit 8, a transmitting radio frequency unit 9, a power amplifying circuit 10, a receiving and transmitting switch circuit 2 and a switch are sequentially connected to form a transmitting radio frequency channel; the input ends of the antenna 1, the receiving and transmitting switch circuit 2, the receiving frequency selection circuit 11 and the receiving radio frequency unit 12 are sequentially connected, and the output end of the receiving radio frequency unit 12 is connected with the second input end of the audio decoding unit to form a receiving radio frequency channel; the transmitting radio frequency unit 9, the receiving radio frequency unit 12 and the digital baseband unit 4 are respectively connected with the microprocessor 3 in two directions, and the audio encoding and decoding unit 7 is connected with the digital baseband unit 4 in two directions. The specific circuits of the transceiving switch circuit 2, the microprocessor 3, the digital baseband unit 4, the audio encoding and decoding unit 7, the external clock circuit 8, the transmitting radio frequency unit 9, the power amplifying circuit 10, the receiving frequency selecting circuit 11 and the receiving radio frequency unit 12 are all the prior art. The key unit 5 is a PTT key, and can speak when pressed.
when the interphone transmits signals: the audio signal entering the microphone 6 is amplified by the audio coding and decoding unit 7 and then converted into a digital signal, the digital signal is stored in a buffer area of the digital baseband unit 4, the digital signal is subjected to gain control, compression, encryption, coding and modulation in the digital baseband unit 4 and then sent to the audio coding and decoding unit 7 to generate a digital signal, the digital signal enters the transmitting radio frequency unit 9 through the external clock circuit 8 to generate a digital radio frequency signal, the digital signal is amplified by the power amplifying circuit 10 and then enters the transceiving switch circuit 2, and the digital signal is transmitted out through the port of the antenna 1.
The process of receiving and transmitting signals by the intercom can be referred to the relevant content of the description in the invention patent application 'a dual-frequency DMR handheld intercom' with the application number 201711160890.2.
The method for realizing the full-duplex interphone comprises the following steps:
A. the microprocessor 3 sets the digital baseband unit 4 to work in a duplex state, sets the receiving radio frequency channel to work in an on receiving state, sets the audio frequency channel to be in a standby closing state, and makes the interphone be in a duplex standby state; the microprocessor 3 audio channel comprises a transmitting audio channel and a receiving audio channel, and the transmitting audio channel comprises a microphone 6 and an audio coding and decoding unit 7 which are connected in sequence; the receiving audio channel comprises an audio coding and decoding unit 7, an audio power amplifier unit 13 and a loudspeaker 14 which are connected in sequence;
B. when a receiving radio frequency channel receives a digital signal, a microprocessor 3 of the interphone analyzes user information and signal parameters of the signal, inquires names, addresses and notes related to the user information in an address book of the interphone according to the user information, opens an audio playing communication voice, and enters a duplex standby state again after the displaying and playing are finished; the user information and signal parameters comprise a user ID, a call color and a call time slot; the receiving radio frequency channel comprises an antenna 1, a receiving and transmitting switch circuit 2, a receiving frequency selection circuit 11, a receiving radio frequency unit 12 and an audio encoding and decoding unit 7 which are connected in sequence;
C. when the microprocessor 3 detects that the PTT is pressed down, the microprocessor 3 judges whether the interphone still receives normal conversation information, if so, the step D is carried out; otherwise, entering step H; if the DMR signal is continuously received and the tail frame is not received, the interphone still receives the normal call information; otherwise, judging that the interphone does not receive the normal call information; how to detect whether the PTT is pressed is the prior art;
D. the microprocessor 3 sets the transmitting state of the digital baseband unit 4 in a duplex state, sets the state of the audio channel in which the loudspeaker 14 and the microphone 6 are simultaneously started, and sets the state of the transmitting radio frequency channel and the receiving radio frequency channel in which the receiving and transmitting alternate start work in the duplex state; the method specifically comprises the following steps:
the operation of the digital baseband unit 4 in the duplex state includes: the audio codec unit 7 allows the input microphone 6 signal to simultaneously start SPK output, the digital baseband unit 4 outputs the received voice data to the audio codec unit 7 while inputting the microphone 6 signal, and sets the states of receiving and transmitting alternate start operation of the transmitting radio frequency channel and the receiving radio frequency channel under duplex, specifically: the microprocessor 3 initializes and controls to close the output of the transmitting radio frequency channel, close the input of the receiving radio frequency channel, controls the output or the input of the transmitting radio frequency channel by detecting the DMR signal of which 30Ms output by the digital baseband unit 4 jumps once, opens the output of the transmitting radio frequency channel when the DMR signal rises, closes the input of the receiving radio frequency channel, closes the output of the transmitting radio frequency channel when the DMR signal falls, opens the input of the receiving radio frequency channel, and realizes the state microprocessor 3 which alternately works in receiving and transmitting under the duplex state;
E. executing the transmission in the duplex state, and entering the step F;
F. the microprocessor 3 judges whether the PTT is loosened, if so, the step A is carried out; otherwise, entering step G; judging whether the PTT is loosened or not by detecting the voltage of a PTT key detection pin;
G. the microprocessor 3 judges whether the received signal in the duplex state disappears, if yes, the step H is carried out; otherwise, entering step E; the method specifically comprises the following steps: when the received signal continuously receives the voice frame and the superframe, judging that the received signal in the duplex state does not disappear, and when the received signal receives the tail frame, judging that the received signal in the duplex state is ended;
H. the microprocessor 3 sets the digital baseband unit 4 to work in simplex emission under the duplex state, sets the audio channel to work in the state of closing the loudspeaker 14 and opening the microphone 6, sets the radio frequency channel to work in the duplex state, closes the radio frequency channel for reception, keeps the state of opening the radio frequency channel for emission, and enters the step I; in this step, the digital baseband unit 4, the transmitting rf channel, the receiving rf channel, and the audio channel are all set according to a duplex state, but transmit according to a simplex transmission, so as to rapidly switch to a duplex transmission state after receiving a duplex signal;
I. the microprocessor 3 judges whether a duplex call reply is received, if so, the step D is entered; otherwise, entering step J; the method specifically comprises the following steps: the digital baseband unit 4 returns the current CALL TYPE according to the received DMR signal, and determines that a CALL reply in a DUPLEX state is received when a digital CALL is received while transmitting and the returned CALL TYPE is CALL _ TYPE _ DUPLEX _ VOICE (the CALL TYPE is specified by motorola protocol);
J. the microprocessor 3 judges whether the PTT is loosened, if so, the step A is carried out; otherwise, go to step H.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims and their equivalents and modifications within the scope of the description.
Claims (9)
1. A method for realizing a full duplex interphone is characterized in that: the method comprises the following steps:
A. the microprocessor sets the digital baseband unit to work in a duplex state, sets the receiving radio frequency channel to work in an on receiving state, sets the audio frequency channel to be in a standby closing state, and makes the interphone be in a duplex standby state;
B. after the receiving radio frequency channel receives the digital signal, the microprocessor of the interphone analyzes the user information and the signal parameters of the signal, displays the information which is stored in the interphone and related to the user information, and plays the communication voice;
C. when the microprocessor detects that the PTT is pressed down, the microprocessor judges whether the interphone still receives normal conversation information, if so, the step D is carried out; otherwise, entering step H;
D. the microprocessor sets a transmitting state of the digital baseband unit working in a duplex state, sets a state of an audio channel working in a state of simultaneously starting a loudspeaker and a microphone, and sets a state of alternately starting receiving and transmitting work of a transmitting radio frequency channel and a receiving radio frequency channel working in the duplex state;
E. executing the transmission in the duplex state, and entering the step F;
F. judging whether the PTT is loosened, if so, entering the step A; otherwise, entering step G;
G. judging whether the received signal in the duplex state disappears, if so, entering a step H; otherwise, entering step E;
H. setting a simplex transmitting state of the digital baseband unit in a duplex state by the microprocessor, setting an audio channel in a state of closing a loudspeaker and opening a microphone, and setting a state of closing a receiving radio frequency channel and keeping opening a transmitting radio frequency channel in the duplex state, and entering the step I;
I. d, judging whether a duplex call reply is received, if so, entering the step D; otherwise, entering step J;
J. judging whether the PTT is loosened, if so, entering the step A; otherwise, go to step H.
2. The method for implementing the full-duplex interphone according to claim 1, characterized in that: and the user information and the signal parameters in the step B comprise a user ID, a call color code and a call time slot.
3. The method for implementing the full-duplex interphone according to claim 1, characterized in that: the audio channel comprises a transmitting audio channel and a receiving audio channel, and the transmitting audio channel comprises a microphone and an audio coding and decoding unit which are connected in sequence; the receiving audio channel comprises an audio coding and decoding unit, an audio power amplifier unit and a loudspeaker which are connected in sequence.
4. The method for implementing a full-duplex interphone according to claim 1, 2 or 3, characterized in that: the transmitting radio frequency channel comprises an audio coding and decoding unit, an external clock circuit, a transmitting radio frequency unit, a power amplifying circuit, a receiving and transmitting switch circuit and an antenna which are connected in sequence; the receiving radio frequency channel comprises an antenna, a receiving and transmitting switch circuit, a receiving frequency selection circuit, a receiving radio frequency unit and an audio coding and decoding unit which are connected in sequence.
5. The method for implementing a full-duplex interphone according to claim 1, 2 or 3, characterized in that: the step C is specifically as follows: and judging whether the DMR signal is continuously received and the tail frame is not received, if so, judging that the interphone still receives normal call information, and otherwise, judging that the interphone does not receive the normal call information.
6. The method for implementing a full-duplex interphone according to claim 3, characterized in that: the step D is specifically as follows: the digital baseband unit works in a duplex state and comprises the following steps: the audio encoding and decoding unit allows an input microphone signal to simultaneously start SPK output, the digital baseband unit outputs received voice data to the audio encoding and decoding unit while inputting the microphone signal, and sets the states of receiving and transmitting alternate start work of the transmitting radio frequency channel and the receiving radio frequency channel under duplex, specifically: the microprocessor is initialized to control the closing of the output of the transmitting radio frequency channel, the closing of the input of the receiving radio frequency channel, the control of the output or the input of the transmitting radio frequency channel and the receiving radio frequency channel by detecting the DMR signal which is output by the digital baseband unit and jumps once by 30Ms, the opening of the output of the transmitting radio frequency channel when the DMR signal rises, the closing of the input of the receiving radio frequency channel, the closing of the output of the transmitting radio frequency channel when the DMR signal falls, the opening of the input of the receiving radio frequency channel, and the state of alternate work of receiving and transmitting under the duplex state is realized.
7. The method for implementing a full-duplex interphone according to claim 1, 2 or 3, characterized in that: in step G, when the received signal continuously receives the voice frame and the super frame, it is determined that the received signal in the duplex state does not disappear, and when the received signal receives the end frame, it is determined that the received signal in the duplex state has ended.
8. The method for implementing a full-duplex interphone according to claim 1, 2 or 3, characterized in that: the step I is specifically as follows: and the digital baseband unit returns the current CALL TYPE according to the received DMR signal, and judges that a CALL reply in a DUPLEX state is received when a digital CALL is received during transmission and the returned CALL TYPE is CALL _ TYPE _ DUPLEX _ VOICE.
9. The interphone based on the full duplex intercom realization method of any one of claims 1 to 8, characterized in that: the device comprises an antenna, a transceiving switch circuit, a microprocessor, a digital baseband unit, a key unit, a power amplification circuit, a transmitting radio frequency unit, an external clock circuit, an audio coding and decoding unit, a microphone, an audio power amplifier unit, a loudspeaker, a receiving frequency selection circuit and a receiving radio frequency unit, wherein the microphone is connected with a first input end of the audio decoding unit to form a transmitting audio channel; the first output end of the audio coding and decoding unit is connected with the input end of the audio power amplifier unit, and the loudspeaker is connected with the output end of the audio power amplifier unit to form a received audio channel; the second output end of the audio coding and decoding unit is connected with the input end of an external clock circuit, the output end of the external clock circuit, the transmitting radio frequency unit, the power amplifying circuit, the receiving and transmitting switch circuit and the switch are sequentially connected to form a transmitting radio frequency channel; the antenna, the receiving and transmitting switch circuit, the receiving frequency selection circuit and the receiving radio frequency unit input end are sequentially connected, and the receiving radio frequency unit output end is connected with the second input end of the audio decoding unit to form a receiving radio frequency channel; the transmitting radio frequency unit, the receiving radio frequency unit and the digital baseband unit are respectively connected with the microprocessor in a bidirectional mode, and the audio coding and decoding unit is connected with the digital baseband unit in a bidirectional mode.
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