CN104135723B - Individual calling or the method and device that group is exhaled are realized in wireless voice/data system - Google Patents

Abstract

The present invention relates to a method for realizing voice single call or group call in a wireless voice/data communication system, comprising the following steps: receiving external input or predetermined address code composed of several bits in the device; The address code modulates the radio frequency carrier signal in a digital modulation manner and sends the modulated radio frequency signal; the equipment terminal receiving the radio frequency demodulates the above radio frequency digital modulation signal to obtain the address code; and the obtained address code and Each address code that needs to be responded stored in the terminal is compared one by one, and it is judged whether it is the same as one of them. If there is the same address code, the squelch control signal is changed to make the speaker of the terminal sound; otherwise, the squelch is maintained . The invention also relates to a device for implementing the above method. The method and device for realizing single call or group call in the wireless voice/data communication system of the present invention have the following beneficial effects: the call effect is good, and single call or group call can be realized.

Description

Method and device for realizing single call or group call in wireless voice/data system

technical field

The present invention relates to a wireless communication system, more specifically, to a method and device for realizing single call or group call in a wireless voice/data communication system.

Background technique

In a wireless voice/data communication system (including a separate voice communication system, a separate data communication system, and a combination of the two), due to the large number of communication terminals and the continuous increase in the coverage of a single terminal, it is necessary to The voice signal is controlled. At present, the sub-audio frequency method is usually used to realize the site selection call of the voice communication terminal, that is, when the transmitter sends the voice signal, the transmitter continuously sends out sub-audio frequency (the frequency is lower than 300 Hz) continuous signals, and these sub-audio signals are related to the audio frequency. The signals modulate the radio frequency carrier together, and then transmit it on the same channel after modulation. When the receiver receives the modulated radio frequency signal, it mediates the sub-audio signal. The sub-audio signal is decoded by the processor, compared with the preset code in the machine to determine whether to open the squelch door. If they are the same, it is considered that the called communication terminal is the terminal, so the squelch is turned on to make the loudspeaker sound; However, this sub-audio address selection method has the following disadvantages: due to the small number of available sub-audio frequencies, the number of addresses is limited when used as a selective call; in addition, if a sub-audio frequency is used at a higher frequency (such as 250Hz), it is close to the audio frequency range , the continuous sub-audio transmission during the call will interfere with normal voice communication; due to the small number of addresses, the application of multiple group calls, group calls and single calls is often limited. In reality, when this technology adopts a higher frequency sub-audio frequency, it affects the call effect, and cannot be used for a large number of voice communication terminals to realize individual calls, group calls and group calls.

Contents of the invention

The technical problem to be solved by the present invention is to provide a good call effect that can be used for A voice communication system with a large number of terminals, and a method and device for realizing single call or group call in a wireless voice communication system capable of realizing group calls.

The technical solution adopted by the present invention to solve the technical problems is: construct a method for realizing single call or group call in the wireless voice/data communication system, comprising the following steps:

A) Receive or select from the outside the predetermined address code composed of multiple bits in the device, the address code indicates one or more communication terminals that this communication wishes to respond to;

B) When the transmission of the voice activation signal takes effect, first modulate the radio frequency carrier signal with the address code in a digital modulation mode and send the modulated radio frequency signal;

C) The communication terminal receiving the modulated radio frequency signal demodulates the radio frequency carrier to obtain the address code;

D) Compare the obtained address code with the address code stored in the terminal and the terminal needs to respond one by one, and judge whether it is the same as one of them. If there is the same address code, change the squelch control signal so that the terminal sound from the speaker; otherwise, the mute is maintained so that the speaker does not sound.

Furthermore, the address code includes several bits, and the address code uses a set number of digits to indicate one, a group or all communication terminals. When an address code only exists in one communication terminal, the address code indicates a For a communication terminal, when an address code exists in multiple communication terminals, the address code represents a group of communication terminals, and when an address code exists in all communication terminals, the address code represents all communication terminals.

Furthermore, each communication terminal stores one or more address codes inside; in the step D), when the receiving end compares the received address code with each address code stored in the machine, as long as it finds that the When the received address code is the same as one of the address codes stored in the machine, the squelch will be opened, and the uncompared address codes stored in the machine will not be compared; When the address codes are the same, the squelch will be maintained.

Further, the step B) further includes the following steps:

B1) Determine whether the launch is started, if yes, execute the next step; otherwise, repeat this step;

B2) Output the digital signal forming the obtained target address code one by one as the modulation signal, modulate the carrier wave, obtain the modulated radio frequency signal and send it;

B3) Judging whether the target address code has been sent a set number of times, if not, return to step B2); if yes, use the voice signal as a modulating signal to modulate the carrier and send the modulated radio frequency signal.

Furthermore, the step D) further includes the following steps:

D1) Compare the received address codes with the address codes stored in this machine one by one to determine whether there is a consistent address code, if so, go to the next step; otherwise, keep the current state unchanged after traversing the address codes stored in the machine;

D2) Output a control signal to open the squelch of the machine, and the speaker is electrically connected to the voice output terminal.

Furthermore, the set times of sending the address code is at least once.

The present invention also relates to a device for implementing the above method, comprising:

Address code selection unit: used for externally receiving or selecting an address code composed of multiple bits predetermined in the device, said address code indicating one or more communication terminals that this communication wishes to respond to;

Address code digital modulation unit: used to first modulate the radio frequency carrier signal of the address code in a digital modulation mode and send the modulated radio frequency signal when the transmission of the voice start signal takes effect;

Address code digital demodulation unit: used for the communication terminal receiving the modulated radio frequency signal to demodulate the radio frequency carrier to obtain the address code;

Address code comparison unit: used to compare the obtained address code with the address code stored in the terminal and the terminal needs to respond one by one, and judge whether it is the same as one of them. If there is the same address code, change the squelch control signal, so that the speaker of the terminal makes sound; otherwise, maintain mute, so that the speaker does not make sound.

Furthermore, the address code includes a plurality of bits, and the address code uses set digits to indicate one, a group or all communication terminals. When an address code only exists in one communication terminal, the address code indicates For a communication terminal, when an address code exists in multiple communication terminals, the address code represents a group of communication terminals; when an address code exists in all communication terminals, the address code represents all communication terminals.

Furthermore, the address code digital modulation unit further includes:

Launch judgment module: used to judge whether the launch is started, if so, call the target address code modulation module; otherwise, continue to call the launch judgment module;

Target address code modulation module: used to output the digital signal that constitutes the obtained target address code one by one as a modulation signal, modulate the carrier wave, obtain the modulated radio frequency signal and send it;

Address code sending number of times judgment module: used to judge whether the target address code is sent a set number of times, if not, call the target address code modulation module; if so, use the voice signal as a modulation signal to modulate the carrier and send the modulated RF signal.

Further, the address code comparison module further includes:

Address code comparison module: used to compare the received address codes with the address codes stored in this machine one by one to determine whether there is a consistent address code, if so, call the control signal output module; otherwise, traverse the address codes stored in the machine and maintain The current state remains unchanged;

Control signal output module: used to output control signals, so that the squelch of the machine is opened, and the speaker is electrically connected to the voice output terminal.

Implementing the method and device for realizing single call or group call in the wireless voice/data system of the present invention has the following beneficial effects: it is used to represent the address code of the communication terminal using several bits, and use the address before sending the voice signal The code modulates the carrier signal and sends it; so that the communication terminal receiving the carrier signal can obtain the address code and compare it with the address code stored in the communication terminal to indicate its identity or group, and when it is the same Only after opening the squelch, the loudspeaker of the communication terminal makes sound. In this way, individual calls or group calls in the voice/data system are realized; at the same time, since the address code is only transmitted within the set time before the audio signal is sent, the voice quality will not be affected. Therefore, the call effect is good, it can be used in a voice/data system with a large number of terminals, and it can also realize single call or group call in a wireless voice/data system.

Description of drawings

Fig. 1 is the realization flowchart of its method in the method and device embodiment of the present invention realizing individual call or group call in wireless voice/data system;

Fig. 2 is a schematic structural diagram of the device in the embodiment.

Detailed ways

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, in the embodiment of the method and device for realizing single call or group call in the wireless voice/data system of the present invention, its method comprises the following steps:

Step S11 Generating or selecting an address code: For a voice/data system, it includes multiple independent communication terminals, and when a communication terminal initiates a call, it must have a certain calling object. These call objects may be other communication terminals set in a group, or a specific communication terminal, or all communication terminals in the system. These situations are called group call, single call and group call respectively. . In this embodiment, a communication terminal calling another specific communication terminal is taken as an example to illustrate the implementation process. For the situation that the call is set to other terminals in a group, in this embodiment, only the address code used by the communication terminal that initiates the call is different, and the address code does not only exist in one communication terminal, but in multiple All communication terminals exist (at the same time, these communication terminals also have at least one address code that only exists in the terminal and represents the terminal itself). In this way, a terminal can be simply divided into multiple groups at the same time, and the price paid is only to store several more address codes representing different groups. Specifically, in this step, when a communication terminal wants to call another specific communication terminal, it must know the address code of the communication terminal it wants to call or some kind of marking method that can represent its address code. In an example, the address code of the communication terminal desired to be called can be obtained by inputting or selecting from information already stored in the communication terminal. In this embodiment, the address code is a numerical value expressed in binary, which includes several bits. An address code can represent a communication terminal, a group of communication terminals or all communication terminals, which depends entirely on the number of terminals that exist in it. . For example, a communication terminal, a group of communication terminals or all communication terminals are represented by two bytes, that is, a 16-bit binary number. In other words, in the present embodiment, the address code includes several bits, and the length of all address codes is the same; the set digits are used to represent one, a group or all communication terminals in the address code, when an address code only exists in When in one communication terminal, the address code indicates a communication terminal; when an address code exists in multiple communication terminals, the address code indicates a group of communication terminals; when an address code exists in all communication terminals, the address code Indicates all communication terminals.

Step S12 Before sending the voice signal, use the address code to modulate the radio frequency carrier and send the modulated radio frequency signal: In this step, after the address code is obtained, the address code is output in the form of a digital modulation signal, and at the same time, the address The output end of the code is connected to the input end of the radio frequency modulation signal, so that the address code output in the form of a digital signal modulates the radio frequency carrier signal of the communication terminal, and then sends out the modulated radio frequency signal. When sending voice, the modulation signal input terminal of the modulator of the communication terminal is connected to the audio signal obtained from the terminal's pickup and subjected to processing steps such as amplification and shaping. In this embodiment, in order to determine the communication terminal of the call, before the audio signal is sent, the address code output from the address code output terminal is used as a modulation signal to make it modulate the radio frequency carrier, and the modulated radio frequency signal Sending it out is convenient for other communication terminals to receive these modulated radio frequency signals, so as to determine whether the received call is aimed at itself, and then decide whether to open its own squelch. In the present embodiment, this step can also be further subdivided into the following steps: determine whether the transmission starts, and if so, perform the next step; otherwise, repeat this step; output the digital signal forming the target address code obtained one by one as the modulation signal, Modulate the carrier to obtain the modulated radio frequency signal and send it; judge whether the target address code is sent for a set number of times, if not, return to the above sending step; if so, use the voice signal as a modulation signal to modulate the carrier and send it modulated RF signal. That is, when the launch button is pressed, first connect the RF modulation input terminal to the address code output terminal; output the obtained address codes in sequence according to the number of digits; after sending a predetermined number of times, stop outputting the address codes , switch the radio frequency modulation input end to the audio signal output end, and use the audio signal as the modulation signal to modulate the carrier. In this embodiment, as mentioned above, the address code is used to modulate the radio frequency carrier before the audio signal is output (that is, before the audio signal is used to modulate the radio frequency carrier), so the time for sending the address code is limited , if it is too long, it will affect the transmission of the audio signal, thereby having a certain impact on the call effect. For this reason, in this embodiment, a number of transmission times is set, and before the voice signal is sent, the above-mentioned address code is used as a modulation signal to modulate the carrier, and the multiple bits that constitute the address code are sequentially output to modulate the carrier , when all the bits in an address code have been output, it is considered that the address code has been sent once. In this step, the address codes for the set number of times are sent continuously and after the set number of times are sent, the audio signal starts to be sent. In this embodiment, the above-mentioned set number of times is set in advance and stored in the communication terminal. Generally speaking, in order not to affect the transmission of subsequent voice signals, and to ensure that the address code can be effectively sent, in this embodiment, The above-mentioned time taken for sending the address code for the set number of times is generally 20-50 milliseconds. This is because the time taken to send the address code depends to a certain extent on the data transmission rate and the launch start time, and the response time of the receiver of the other party needs to be considered. The shorter the sum of these times, the shorter the time it takes to send the address code. Some preparation time is indispensable for both the transmission of the address code and the transmission of the voice, and the transmission of the address code will generate additional transmission time. According to the current data transmission rate, the additional time for sending an address code generally takes about 20ms. For voice transmission, such additional time is basically negligible.

Step S13 Receive the radio frequency signal, demodulate it, and obtain the address code: In this embodiment, the above-mentioned steps S11 and S12 are executed on the communication terminal that initiated the call; Executed on the communication terminal. Generally speaking, all communication terminals that receive the radio frequency signal from the communication terminal that initiated the call will perform these steps, but the results of the execution are different. For a specific communication terminal, if the radio frequency signal received If the address code is associated with itself, the squelch will be opened and the speaker will sound; otherwise, the squelch will not be opened. However, in this embodiment, a communication terminal that receives the above-mentioned radio frequency signal is taken as an example to illustrate the process. In this step, the communication terminal receives the radio frequency signal, demodulates it, and obtains a baseband demodulated and decoded signal, and the decoded signal is the address code of the communication terminal that the calling communication terminal needs to call. This address code may represent one communication terminal, may also represent a group of communication terminals, or may represent all communication terminals.

Step S14 compares whether the address code stored in this machine is the same as that received, and if it is the same, execute step S15; if not, execute step S16; Indicates the address codes of the group and group where the machine is located. These address codes are allocated in advance and stored in each communication terminal. The length of these address codes is the same, but the terminals they exist are different. If an address code denotes only one communication terminal, it exists only in that communication terminal; if an address code denotes a group of terminals, it exists in all terminals of said group. In this step, the address code carried by the radio frequency signal obtained in the above steps is compared with the address code stored in the machine. If there is more than one address code stored in the machine, the obtained address code will be compared with the stored address code. All address codes are compared one by one, if any one of the address codes is the same, it means that this machine is the calling object or one of the calling objects; if the obtained address code is different from all the address codes stored in this machine, it means that this machine is not called object, step S16 should be executed. It is worth mentioning that in this step, if there are multiple address codes in a terminal, and the address code is found to be the same as the received address code before the comparison is completed, there is no need to compare the remaining address codes; otherwise, Then it is necessary to traverse all the address codes stored in the terminal to get different conclusions.

Step S15 Open the squelch to make the speaker sound: In this step, it is determined that the local machine is the called object or one of the objects. Therefore, a control signal is output to open the squelch of the machine, and the speaker is electrically connected to the voice output terminal.

Step S16 Keep the squelch, and the speaker does not make sound: In this step, since it is judged that the call has nothing to do with the local unit, the squelch is kept closed, so that the local speaker does not make sound.

This embodiment also relates to a device for implementing the above method. As shown in FIG. 2 , in this embodiment, the device includes: an address code selection unit 1 , an address code digital modulation unit 2 , an address code digital demodulation unit 3 and an address code comparison unit 4 . Among them, the address code selection unit 1 is used to receive or select an address code predetermined by multiple bits in the device from the outside, and the address code represents one or more communication terminals that this communication wishes to respond to; the address code is digitally modulated Unit 2 is used to first modulate the radio frequency carrier signal with the address code in a digital modulation mode and send the modulated radio frequency signal when the voice start signal is in effect; the address code digital demodulation unit 3 is used to receive the modulated The communication terminal of the final radio frequency signal demodulates the radio frequency carrier to obtain the address code; the address code comparison unit 4 is used to compare the obtained address code with the address code stored in the terminal and the terminal needs to respond one by one, And judge whether it is the same as one of them, if there is the same address code, then change the squelch control signal to make the speaker of the terminal sound; otherwise, maintain the squelch so that the speaker does not make sound. In this embodiment, the address code includes a plurality of bits, and the set digits are used to represent one, a group or all communication terminals in the address code. When an address code only exists in one communication terminal, the address code represents For a communication terminal, when an address code exists in multiple communication terminals, the address code represents a group of communication terminals; when an address code exists in all communication terminals, the address code represents all communication terminals.

In the present embodiment, the address code digital modulation unit 2 further includes: a transmission judgment module 21, a target address code modulation module 22 and an address code sending times judgment module 23; wherein, the transmission judgment module 21 is used to judge whether the transmission starts, if so, Call the target address code modulation module 22; Otherwise, continue to call the emission judgment module 21; The target address code modulation module 22 is used to output the digital signal that forms the target address code that obtains one by one as the modulation signal, and the carrier is modulated to obtain the modulated radio frequency Signal and send; Address code sends number of times judging module 23 is used for judging whether described target address code sends setting number of times, if not, calls target address code modulation module; If so, with voice signal as modulation signal, described carrier is modulated and Send the modulated radio frequency signal.

In addition, the address code comparison unit 4 further includes: an address code comparison module 41 and a control signal output module 42; Consistent address codes, if any, call the control signal output module 42; otherwise, keep the current state unchanged after traversing the local storage address codes; the control signal output module 42 is used to output control signals, so that the squelch of this machine is opened, and the loudspeaker It is electrically connected with the voice output terminal.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (8)

1. A method for realizing single call or group call in wireless voice/data communication system, is characterized in that, comprises the steps: A) Receive or select an address code predetermined by multiple bits in the device from the outside, and the address code indicates one or more communication terminals that this communication wishes to respond to; B) when the transmission of the voice start signal takes effect, the address code is first modulated with a digital modulation mode radio frequency carrier signal and sends the modulated radio frequency signal; C) The communication terminal receiving the modulated radio frequency signal demodulates the radio frequency carrier to obtain the address code; D) Compare the obtained address codes with the address codes stored in the terminal and the terminal needs to respond one by one, and judge whether it is the same as one of them. If there is the same address code, change the squelch control signal so that the terminal sound from the speaker; otherwise, maintain a mute so that the speaker does not sound; Wherein, the address code includes several bits, and the set digits in the address code represent one, a group or all communication terminals. When an address code only exists in one communication terminal, the address code represents a communication terminal , when an address code exists in multiple communication terminals, the address code represents a group of communication terminals, and when an address code exists in all communication terminals, the address code represents all communication terminals. 2. the method for realizing single call or group call in wireless voice/data communication system according to claim 1, is characterized in that, each communication terminal interior all stores one or more address codes; In described step D) When the receiving end compares the received address code with each address code stored in the machine, as long as it finds that the received address code is the same as one of the address codes stored in the machine, it will open the squelch, and will not Then compare the uncompared address codes stored in the machine; if the address codes stored in the machine are traversed and found to be the same as the received address codes, the squelch will be kept closed. 3. the method for realizing single call or group call in wireless voice/data communication system according to claim 2, is characterized in that, described step B) further comprises the steps: B1) judge whether to launch, if so, execute the next step; otherwise, repeat this step; B2) output the digital signal forming the target address code obtained one by one as a modulation signal, modulate the carrier, obtain the modulated carrier signal and send it; B3) judging whether the target address code has been sent a set number of times, if not, return to step B2); if yes, use the voice signal as a modulation signal to modulate the carrier and send the modulated carrier signal. 4. the method for realizing single call or group call in wireless voice/data communication system according to claim 3, is characterized in that, further comprises the following steps in the described step D): D1) compare the address codes received with the address codes stored in this machine one by one to judge whether there is a consistent address code, if so, execute the next step; otherwise, keep the current state unchanged after traversing the address codes stored in this machine; D2) Outputting a control signal, so that the squelch of the machine is opened, and the loudspeaker is electrically connected to the voice output terminal. 5. The method for realizing a single call or a group call in a wireless voice/data system according to any one of claims 1-4, characterized in that the set times of sending the address code is at least once. 6. A device for realizing the method as claimed in claim 1, comprising: Address code selection unit: used for externally receiving or selecting an address code composed of multiple bits predetermined in the device, said address code indicating one or more communication terminals that this communication wishes to respond to; Address code digital modulation unit: used to transmit the voice start signal when it takes effect, first modulate the radio frequency carrier signal of the address code with a digital modulation method and send the modulated radio frequency signal; Address code digital demodulation unit: used for the communication terminal receiving the modulated radio frequency signal to demodulate the radio frequency carrier to obtain the address code; Address code comparison unit: used to compare the obtained address code with the address code stored in the terminal and the terminal needs to respond one by one, and judge whether it is the same as one of them. If there is the same address code, change the squelch control signal, so that the speaker of the terminal makes sound; otherwise, maintain mute, so that the speaker does not make sound; Wherein, the address code includes a plurality of bits, and the set digits in the address code represent one, a group or all communication terminals. When an address code only exists in one communication terminal, the address code represents a communication terminal. Terminal, when an address code exists in multiple communication terminals, the address code represents a group of communication terminals, and when an address code exists in all communication terminals, the address code represents all communication terminals. 7. The device according to claim 6, wherein the address code digital modulation unit further comprises: Launch judgment module: used to judge whether the launch is started, if so, call the target address code modulation module; otherwise, continue to call the launch judgment module; Target address code modulation module: used to output the digital signal that constitutes the obtained target address code one by one as a modulation signal, modulate the carrier, obtain the modulated carrier signal and send it; Address code sending number of times judgment module: used to judge whether the target address code is sent a set number of times, if not, call the target address code modulation module; if so, use the voice signal as a modulation signal to modulate the carrier and send the modulated RF signal. 8. The device according to claim 7, wherein the address code comparing unit further comprises: Address code comparison module: used to compare the received address codes with the address codes stored in this machine one by one to determine whether there is a consistent address code, if so, call the control signal output module; otherwise, traverse the address codes stored in the machine and maintain The current state remains unchanged; Control signal output module: used to output control signals, so that the squelch of the machine is opened, and the speaker is electrically connected to the voice output terminal.