CN105812963B - Relay system and signal conversion method of interphone - Google Patents
Relay system and signal conversion method of interphone Download PDFInfo
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- CN105812963B CN105812963B CN201410843074.1A CN201410843074A CN105812963B CN 105812963 B CN105812963 B CN 105812963B CN 201410843074 A CN201410843074 A CN 201410843074A CN 105812963 B CN105812963 B CN 105812963B
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Abstract
The invention relates to a relay system and a signal conversion method of an interphone, which are used for solving the problem that the communication between equipment cannot be realized by the existing digital equipment and analog equipment in the prior art. The invention discloses a relay system, comprising: the digital relay equipment is used for converting the received first digital radio frequency signal into a first digital signal; a control device for converting the first digital signal into a first PCM signal; a voice digital-to-analog conversion device for converting the first PCM signal into a first analog audio signal; and the analog relay equipment is used for converting the first analog audio signal into a first analog radio frequency signal and sending the first analog radio frequency signal. By adopting the system of the embodiment of the invention, the received first digital radio frequency signal can be converted by the system to generate the first analog radio frequency signal and then be transmitted, thereby realizing the conversion of the signal between the digital equipment and the analog equipment and further realizing the communication between the digital equipment and the analog equipment.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a relay system of an interphone and a signal conversion method.
Background
With the maturity of wireless Digital private network wireless communication standards such as DMR (Digital Mobile Radio) and the development of Digital terminals and relay systems of related standards being improved, devices using these standards are being accepted by more users, and in recent years, these standards are being applied more and more in various fields such as Digital intercom terminals and relay systems.
In the currently common talkback relay system, the traditional analog talkback only supports the relay between analog interphones under the bandwidth of 12.5K or 25K; the novel digital talkback relay not only supports relay communication between digital interphones, but also supports relay communication between analog interphones; but cannot realize the communication between the digital interphone and the analog interphone.
In summary, the conventional digital devices and analog devices cannot communicate with each other.
Disclosure of Invention
The invention provides a relay system and a signal conversion method of an interphone, which are used for solving the problem that the existing digital equipment and analog equipment cannot realize communication between the equipment in the prior art.
The embodiment of the invention provides a relay system of an interphone, which comprises the following components: the system comprises a digital transfer device, a control device, a voice digital-to-analog conversion device and an analog transfer device; wherein, the digital transfer equipment is connected with the control equipment; the control equipment is connected with the voice digital-to-analog conversion equipment; the voice digital-to-analog conversion equipment is connected with the analog transfer equipment;
the digital relay equipment is used for converting the received first digital radio frequency signal into a first digital signal;
the control device is configured to convert the first digital signal into a first PCM (Pulse Code Modulation) signal;
the voice digital-to-analog conversion device is used for converting the first PCM signal into a first analog audio signal;
the analog transfer device is used for converting the first analog audio signal into a first analog radio frequency signal and sending the first analog radio frequency signal.
The second relay system of the interphone provided by the embodiment of the invention comprises: the system comprises a digital transfer device, a control device, a voice digital-to-analog conversion device and an analog transfer device; wherein, the digital transfer equipment is connected with the control equipment; the control equipment is connected with the voice digital-to-analog conversion equipment; the voice digital-to-analog conversion equipment is connected with the analog transfer equipment;
the analog transfer equipment is used for converting the first analog radio frequency signal into a second analog audio signal;
the voice digital-to-analog conversion device is used for converting the second analog audio signal into a second PCM signal;
the control device is used for converting the second PCM signal into a third digital signal;
and the digital transfer equipment is used for converting the third digital signal into a second digital radio frequency signal and sending the second digital radio frequency signal.
The relay system of the third interphone provided by the embodiment of the invention comprises the relay system of the first interphone and the relay system of the second interphone.
The embodiment of the invention provides a signal conversion method of an interphone, which comprises the following steps:
after receiving the first digital radio frequency signal, the digital relay device converts the first digital radio frequency signal into a first digital signal and sends the first digital signal to the control device; after receiving the third digital signal sent by the control equipment, converting the third digital signal into a second digital radio frequency signal and sending the second digital radio frequency signal;
after receiving a first digital signal sent by the digital transfer equipment, the control equipment converts the first digital signal into a first PCM signal and sends the first PCM signal to the voice digital-to-analog conversion equipment; after receiving a second PCM signal sent by the voice digital-to-analog conversion device, converting the second PCM signal into a third digital signal, and sending the third digital signal to the digital transfer device;
after receiving the first PCM signal sent by the control device, the voice digital-to-analog conversion device converts the first PCM signal into a first analog audio signal and sends the first analog audio signal to the analog relay device; after receiving a second analog audio signal sent by the analog relay device, converting the second analog audio signal into a second PCM signal, and sending the second PCM signal to the control device;
after receiving the first analog audio signal sent by the voice digital-to-analog conversion equipment, the analog transfer equipment converts the first analog audio signal into a first analog radio frequency signal and sends the first analog radio frequency signal; after receiving a first analog radio frequency signal, converting the first analog radio frequency signal into a second analog audio signal, and sending the second analog audio signal to the voice digital-to-analog conversion equipment.
The relay system in the embodiment of the invention comprises: the system comprises a digital transfer device, a control device, a voice digital-to-analog conversion device and an analog transfer device; the digital relay device is used for converting the received first digital radio frequency signal into a first digital signal, converting the first digital signal into a first PCM signal through the control device, converting the first PCM signal into a first analog audio signal through the voice digital-to-analog conversion device, and converting the first analog audio signal into a first analog radio frequency signal through the analog relay device and transmitting the first analog audio signal. Therefore, by adopting the system of the embodiment of the invention, the received first digital radio frequency signal can be converted by the system to generate the first analog radio frequency signal and then be transmitted, thereby realizing the conversion of the signal between the digital equipment and the analog equipment and further realizing the communication between the digital equipment and the analog equipment.
Drawings
Fig. 1 is a schematic diagram of a relay system connection provided in an embodiment of the present invention;
fig. 2 is a schematic view of an internal structure of the digital relay device according to the embodiment of the present invention;
fig. 3 is a schematic internal structural diagram of a control device according to an embodiment of the present invention;
fig. 4 is a schematic view of an internal structure of the simulation transfer apparatus according to the embodiment of the present invention;
fig. 5 is a schematic diagram of an overall structure of a relay system according to an embodiment of the present invention;
fig. 6 is a flowchart of a signal conversion method of an intercom according to an embodiment of the present invention;
FIG. 7 is a flowchart of a method for converting digital signals into analog signals according to an embodiment of the present invention;
FIG. 8 is a flowchart of an analog-to-digital signal conversion method according to an embodiment of the present invention;
FIG. 9 is a flowchart of a digital-to-digital signal conversion method according to an embodiment of the present invention;
fig. 10 is a flowchart of a signal conversion method from analog to analog according to an embodiment of the present invention.
Detailed Description
The relay system provided by the embodiment of the invention comprises: the system comprises a digital transfer device, a control device, a voice digital-to-analog conversion device and an analog transfer device; wherein, the digital transfer equipment is connected with the control equipment; the control equipment is connected with the voice digital-to-analog conversion equipment; the voice digital-to-analog conversion equipment is connected with the analog transfer equipment; the digital relay equipment is used for converting the received first digital radio frequency signal into a first digital signal; a control device for converting the first digital signal into a first PCM signal; a voice digital-to-analog conversion device for converting the first PCM signal into a first analog audio signal; and the analog relay equipment is used for converting the first analog audio signal into a first analog radio frequency signal and sending the first analog radio frequency signal. By adopting the system of the embodiment of the invention, the received first digital radio frequency signal can be converted by the system to generate the first analog radio frequency signal and then be transmitted, thereby realizing the conversion of the signal between the digital equipment and the analog equipment and further realizing the communication between the digital equipment and the analog equipment.
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The method and system provided by the present invention will be described in detail with specific embodiments in conjunction with the accompanying drawings.
The embodiment of the invention provides three relay systems, namely a digital-to-analog relay system, an analog-to-digital relay system and a digital-to-analog interconversion relay system, and the three systems are respectively described in detail below.
A first, digital to analog relay system;
as shown in fig. 1, a first relay system provided in an embodiment of the present invention includes: a digital relay device 10, a control device 20, a voice digital-to-analog conversion device 30, and an analog relay device 40; wherein, the digital relay apparatus 10 is connected with the control apparatus 20; the control device 20 is connected with the voice digital-to-analog conversion device 30; the voice digital-to-analog conversion equipment 30 is connected with the analog transfer equipment 40;
a digital relay device 10, configured to convert a received first digital radio frequency signal into a first digital signal;
a control device 20 for converting the first digital signal into a first PCM signal;
a voice digital-to-analog conversion device 30 for converting the first PCM signal into a first analog audio signal;
and the analog transfer device 40 is used for converting the first analog audio signal into a first analog radio frequency signal and transmitting the first analog radio frequency signal.
The first relay system provided in the embodiment of the present invention can implement conversion from a digital signal to an analog signal, and includes a digital relay device 10, a control device 20, a voice digital-to-analog conversion device 30, and an analog relay device 40, where the four devices are sequentially connected, and the digital relay device 10 converts a received digital radio frequency signal through the control device 20, the voice digital-to-analog conversion device 30, and the analog relay device 40, to finally form an analog radio frequency signal and sends the analog radio frequency signal through the analog relay device 40.
In recent years, various digital intercom terminals and relay systems have been used in various applications, but since digital devices are greatly different from existing analog devices in standards and systems, the devices cannot communicate with each other. Therefore, a new digital system cannot be well fused with an old analog system, and only the original analog system can be eliminated or the new digital system is used completely, so that great waste is caused; or two systems of different systems operate independently, so that better effective management cannot be achieved. By adopting the first relay system provided by the embodiment of the invention, the function of receiving the digital interphone signal by using the analog interphone is well realized, and further, the digital system and the old analog system are well integrated.
The first relay system provided by the embodiment of the invention mainly comprises: the digital relay device 10, the control device 20, the voice digital-to-analog conversion device 30, and the analog relay device 40 are four devices, and details will be described below with respect to these four devices, respectively.
Preferably, the digital relay apparatus 10 includes: a first radio frequency signal receiver 101, a digital receiving antenna 102 and a first baseband processor 103;
a first radio frequency signal receiver 101, configured to demodulate a first digital radio frequency signal received through a digital receiving antenna 102 to obtain a first low intermediate frequency signal, and send the first low intermediate frequency signal to a first baseband processor 103;
and the first baseband processor 103 is used for demodulating and decoding the first low intermediate frequency signal to obtain a first digital signal.
Fig. 2 is a schematic diagram of an internal structure of the digital relay device according to the embodiment of the present invention; the digital relay apparatus 10 includes: the digital radio frequency signal receiver comprises three devices, namely a first radio frequency signal receiver 101, a digital receiving antenna 102 and a first baseband processor 103, wherein the digital receiving antenna 102 is connected with the first radio frequency signal receiver 101, and the first radio frequency signal receiver 101 is connected with the first baseband processor 103.
Specifically, the first radio frequency signal receiver 101 demodulates an air interface radio frequency signal (i.e., a first digital radio frequency signal) received by the digital receiving antenna 102 and sent by the uplink digital interphone into a first low intermediate frequency signal smaller than 1MHz, and sends the obtained first low intermediate frequency signal to the first baseband processor 103; after receiving the first low-if signal sent by the first radio frequency signal receiver 101, the first baseband processor 103 demodulates and decodes the first low-if signal to obtain a first digital signal, and interrupts to remind the control device 20 to take the demodulation and decoding from the digital relay device 10 to obtain the first digital signal.
In implementation, the first radio frequency signal receiver 101 may adopt various receiving devices of interphones, such as an analog car platform in a traditional vehicle-mounted interphone and a receiving device in a handheld interphone, and an analog relay downlink device can be transformed into a digital relay downlink device for digital talkback by adding the first baseband processor 103 to the first radio frequency signal receiver 101; the first baseband processor 103 employs an HR _ CB600 chip, and is mainly configured to demodulate and decode the received first low-if signal to obtain a first digital signal.
After the digital relay device 10 converts the received first digital radio frequency signal into a first digital signal, the control device 20 may convert the first digital signal into a first PCM signal, and the control device 20 is described in detail below.
Preferably, the control device 20 comprises: a signal converter 201 and a digital signal repeater 202;
the signal converter 201 is configured to analyze the first digital signal to obtain a digital signaling and a digital voice, and perform voice decompression on the digital voice to obtain a first PCM signal;
a digital signal repeater 202 for transmitting the first PCM signal to the voice digital-to-analog converting device 30;
fig. 3 is a schematic diagram of an internal structure of a control device according to an embodiment of the present invention; the control device 20 includes: a signal converter 201 and a digital signal repeater 202.
Specifically, after the first baseband processor 103 demodulates and decodes the first low-intermediate frequency signal to obtain a first digital signal, the interrupt prompts the control device 20 to take the demodulation and decoding from the digital relay device 10 to obtain the first digital signal, so that after the control device 20 takes the first digital signal from the digital relay device 10, the signal converter 201 analyzes the first digital signal according to a preset protocol standard to obtain digital voice and digital signaling, and performs voice decompression on the digital voice to generate a first PCM signal with a rate of 128 Kbps; the digital signal repeater 202 then transmits the first PCM signal obtained by the signal converter 201 through voice decompression to the voice digital-to-analog converting apparatus 30.
In an actual application process, since the analog relay device 40 cannot actively modulate the first analog audio signal to obtain the first analog radio frequency signal for transmission after receiving the first analog audio signal, the control device 20 needs to send a trigger signal to the analog relay device 40 in advance, which is described in detail below.
Preferably, the control device 20 further comprises: a first trigger 203 for sending a first trigger signal to the analog relay device 40;
that is, as shown in fig. 3, the control device 20 further includes, in addition to the two components of the signal converter 201 and the digital signal repeater 202, a first trigger 203 for sending a first trigger signal to the analog relay device 40, where the first trigger signal is used to turn on the sending enable of the analog relay device 40, so that the analog relay device 40 can send out the first analog radio frequency signal after modulating the received first analog audio signal into the first analog radio frequency signal.
In practice, the predetermined protocol standard for the signal converter 201 to analyze and refer to may be set as needed, and for example, DMR protocol may be used. Control apparatus 20 employs an STM32F407VE chip, primarily for converting the first digital signal to a first PCM signal.
Specifically, the speech dac 30 adopts a codec of an ALC5621 chip, and is mainly configured to perform digital-to-analog conversion on the received first PCM signal to obtain a first analog audio signal.
The analog relay device 40 is mainly configured to convert the first analog audio signal into a first analog radio frequency signal and transmit the first analog radio frequency signal, and the analog relay device 40 is specifically described below.
Preferably, the simulation relay apparatus 40 includes: a second radio frequency signal transmitter 402 and an analog transmit antenna 401;
and the second radio frequency signal transmitter 402 is configured to modulate the first analog audio signal into a first analog radio frequency signal after receiving the first trigger signal, and transmit the first analog audio signal through the analog transmitting antenna 401.
Fig. 4 is a schematic diagram of an internal structure of the simulation relay apparatus according to the embodiment of the present invention; the simulation relay apparatus 40 includes: a second radio frequency signal transmitter 402 and an analog transmitting antenna 401, and the analog transmitting antenna 401 is connected with the second radio frequency signal transmitter 402.
Specifically, after receiving the first trigger signal sent by the first trigger 203 in the control device 20, the second radio frequency signal transmitter 402 modulates the received first analog audio signal sent by the voice digital-to-analog conversion device 30 to obtain a first analog radio frequency signal, and sends the first analog radio frequency signal obtained by the modulation through the transmitting antenna 401, so that other analog interphone terminals in the relay system network receive the first analog audio signal in a downlink manner.
In implementation, the second radio frequency signal transmitter 402 may be used as various transmitter devices of the walkie-talkie, such as a simulation platform in a conventional vehicle-mounted walkie-talkie and a transmitter device in a handheld walkie-talkie, and the second radio frequency signal transmitter 402 and the transmitting antenna 401 together form a simulation relay downlink device.
The digital relay device 10 in the digital-to-analog relay system can be modified into a digital-to-digital relay device by adding a radio frequency signal transmitter and a baseband processor, and after the relay, the power of the digital signal can be effectively increased, so that the transmission distance of the output radio frequency signal is longer. The following specifically describes a process of the digital relay apparatus 10 to convert digital data into digital data.
Preferably, the control device 20 comprises: a signal converter 201 and a digital signal repeater 202;
the signal converter 201 is configured to analyze the first digital signal to obtain a digital signaling and a digital voice, and perform framing again on the digital signaling and the digital voice to obtain a second digital signal;
the digital signal repeater 202 is used for transmitting the second digital signal to the digital relay equipment;
fig. 3 is a schematic diagram of an internal structure of a control device according to an embodiment of the present invention; the control device 20 includes: a signal converter 201 and a digital signal repeater 202. Accordingly, in the process of converting the digital signal into digital signal, the functions of the two devices of the signal converter 201 and the digital signal repeater 202 in the control device 20 are changed.
Specifically, after the first baseband processor 103 demodulates and decodes the first low-intermediate frequency signal to obtain a first digital signal, the interruption reminds the control device 20 to take the demodulation and decoding from the digital relay device 10 to obtain the first digital signal, so that after the control device 20 takes the first digital signal from the digital relay device 10, the signal converter 201 analyzes the first digital signal according to a preset protocol standard to obtain digital voice and digital signaling, and the signal converter 201 may also perform framing again on the digital signaling and the digital voice together to obtain a second digital signal; the second digital signal obtained by the signal converter 201 through the reframing is then transmitted to the digital relay apparatus 10 through the digital signal repeater 202.
In order to enable the digital relay device 10 to perform the digital-to-digital function, a radio frequency signal transmitter and a baseband processor are added to the digital relay device 10, which is described in detail below.
Preferably, the digital relay apparatus 10 further includes: a second baseband processor 104, a first radio frequency signal transmitter 105 and a digital transmit antenna 106;
a second baseband processor 104, configured to encode and modulate a received second digital signal sent by the digital signal repeater to obtain a first baseband signal, and send the first baseband signal to the first radio frequency signal transmitter 105;
and a first radio frequency signal transmitter 105, configured to modulate the first baseband signal to obtain a second digital radio frequency signal, and transmit the second digital radio frequency signal through a digital transmitting antenna 106.
Fig. 2 is a schematic diagram of an internal structure of the digital relay device according to the embodiment of the present invention; the digital relay apparatus 10 further includes: the digital radio frequency signal processing device comprises a second baseband processor 104, a first radio frequency signal transmitter 105 and a digital transmitting antenna 106, wherein the digital transmitting antenna 106 is connected with the first radio frequency signal transmitter 105, and the first radio frequency signal transmitter 105 is connected with the second baseband processor 104.
Specifically, the second baseband processor 104 performs encoding and two-point modulation processing on the received second digital signal sent by the digital signal repeater 202 in the control device 20 to obtain a two-point modulation signal (i.e., a first baseband signal), and sends the obtained two-point modulation signal (i.e., the first baseband signal) to the first radio frequency signal transmitter 105; the first radio frequency signal transmitter 105 modulates the two-point modulation signal (i.e., the first baseband signal) sent by the second baseband processor 104 to obtain a second digital radio frequency signal, and sends the obtained second digital radio frequency signal through the digital transmitting antenna 106, so that other digital interphone terminals in the relay system network perform downlink reception.
In implementation, the first radio frequency signal transmitter 105 may be a transmitter of various interphones, such as a simulation platform in a conventional vehicle-mounted interphone and a transmitter in a handheld interphone; the second baseband processor 104 employs an HR _ CB600 chip, and is mainly configured to encode and modulate a received second digital signal sent by the digital signal repeater to obtain a first baseband signal, and send the first baseband signal to the first radio frequency signal transmitter 105.
In addition to the first relay system, an embodiment of the present invention further provides an analog-to-digital relay system, which is described in detail below.
A second, analog-to-digital relay system;
the operation of the relay system is similar to the system described above, except that the order of the devices performing the actions is changed.
Specifically, the second relay system provided in the embodiment of the present invention includes: a digital relay device 10, a control device 20, a voice digital-to-analog conversion device 30, and an analog relay device 40; wherein, the digital relay apparatus 10 is connected with the control apparatus 20; the control device 20 is connected with the voice digital-to-analog conversion device 30; the voice digital-to-analog conversion equipment 30 is connected with the analog transfer equipment 40;
an analog relay device 40 for converting the first analog radio frequency signal into a second analog audio signal;
a voice digital-to-analog conversion device 30 for converting the second analog audio signal into a second PCM signal;
a control device 20 for converting the second PCM signal into a third digital signal;
and the digital relay device 10 is configured to convert the third digital signal into a third digital radio frequency signal and transmit the third digital radio frequency signal.
The second relay system provided in the embodiment of the present invention can implement conversion from an analog signal to a digital signal, and includes a digital relay device 10, a control device 20, a voice digital-to-analog conversion device 30, and an analog relay device 40, and these four devices are sequentially connected, and the analog relay device 40 converts the received first analog radio frequency signal through the voice digital-to-analog conversion device 30, the control device 20, and the digital relay device 10, to finally form a third digital radio frequency signal and sends the third digital radio frequency signal through the digital relay device 10.
The second relay system provided by the embodiment of the present invention mainly includes: the digital relay device 10, the control device 20, the voice digital-to-analog conversion device 30, and the analog relay device 40 are four devices, and details will be described below with respect to these four devices, respectively.
Preferably, the analog relay apparatus 40 includes: a second radio frequency signal receiver 403 and an analog receiving antenna 404;
a second rf signal receiver 403, configured to convert a second analog rf signal received through the analog receiving antenna 404 into a second analog audio signal, and send the second analog audio signal to the voice dac device 30.
Fig. 4 is a schematic diagram of an internal structure of the simulation relay apparatus according to the embodiment of the present invention; the simulation relay apparatus 40 further includes: a second rf signal receiver 403 and an analog receiving antenna 404, and the analog receiving antenna 404 is connected to the second rf signal receiver 403.
Specifically, the second radio frequency signal receiver 403 demodulates an air interface radio frequency signal (i.e., a second analog radio frequency signal) received by the analog receiving antenna 404 and sent by the uplink analog interphone into a second analog audio signal, and sends the obtained second analog audio signal to the voice digital-to-analog conversion device 30.
In practical applications, since the digital relay device 10 cannot actively convert the received third digital signal into the third digital rf signal for transmission, the analog relay device 40 needs to send a trigger signal to the control device 20 in advance, so that the control device 20 can notify the digital relay device 10 to start sending enable, which is described in detail below.
In implementation, the speech dac 30 employs a codec of the ALC5621 chip, which is mainly used for ADC sampling the received second analog audio signal to generate a 128Kbps second PCM signal.
Preferably, the simulation relay apparatus further includes: a second trigger 406 for sending a second trigger signal to the control device 20;
that is, as shown in fig. 4, the analog relay device 40 includes, in addition to the second rf signal receiver 403 and the analog receiving antenna 404, a second trigger 406 for sending a second trigger signal to the control device 20, where the second trigger signal is used to remind the control device 20 to actively read the second PCM signal to the voice dac device 30, and the control device 20 can notify the digital relay device 10 to start the sending enable, so that the digital relay device 10 can send the third digital rf signal after converting the third digital rf signal sent by the control device 20.
In implementation, the second rf signal receiver 403 may use various receiving devices of an intercom, such as a simulation platform in a conventional vehicle-mounted intercom and a receiving device in a handheld intercom, and the second rf signal receiver 403 and the simulation receiving antenna 404 together form an analog relay uplink receiving device.
After the control device 20 reads the second PCM signal from the voice dac device 30, the control device 20 may also convert the second PCM signal into a third digital signal, and the control device 20 will be described in detail below.
Preferably, the control device 20 comprises: a signal converter 201 and a digital signal repeater 202;
a signal converter 201, configured to compress and reframe the second PCM signal to obtain a third digital signal after receiving the second trigger signal;
the digital signal repeater 202 is used for sending the third digital signal to the digital relay equipment;
fig. 3 is a schematic diagram of an internal structure of a control device according to an embodiment of the present invention; the control device 20 includes: a signal converter 201 and a digital signal repeater 202.
Specifically, after receiving the second trigger signal sent by the second trigger 406 in the analog relay device 40, the signal converter 201 in the control device 20 reads the second PCM signal from the voice digital-to-analog conversion device 30, compresses and re-frames the read second PCM signal to obtain a third digital signal, and then sends the third digital signal to the digital relay device 10 through the digital signal repeater 202.
In practical applications, after receiving the third digital signal sent by the control device 20, the digital relay device 10 may convert the third digital signal into a third digital radio frequency signal and send the third digital radio frequency signal, which is described in detail below.
Preferably, the digital relay apparatus 10 further includes: a second baseband processor 104, a first radio frequency signal transmitter 105 and a digital transmit antenna 106;
the second baseband processor 104 is configured to encode and modulate the third digital signal obtained by the conversion by the control device to obtain a second baseband signal, and send the second baseband signal to the first radio frequency signal transmitter;
and the first radio frequency signal transmitter 105 is configured to modulate the second baseband signal to obtain a third digital radio frequency signal, and transmit the third digital radio frequency signal through the digital transmitting antenna 106.
Fig. 2 is a schematic diagram of an internal structure of the digital relay device according to the embodiment of the present invention; the digital relay apparatus 10 further includes: the digital radio frequency signal processing device comprises a second baseband processor 104, a first radio frequency signal transmitter 105 and a digital transmitting antenna 106, wherein the digital transmitting antenna 106 is connected with the first radio frequency signal transmitter 105, and the first radio frequency signal transmitter 105 is connected with the second baseband processor 104.
Specifically, after the control device 20 sends the third digital signal to the digital relay device 10, the second baseband processor 104 in the digital relay device 10 performs encoding and two-point modulation on the received third digital signal to obtain a two-point modulation signal (i.e., a second baseband signal), and sends the obtained two-point modulation signal (i.e., the second baseband signal) to the first radio frequency signal transmitter 105; after receiving the two-point modulation signal (i.e., the second baseband signal) sent by the second baseband processor 104, the first radio frequency signal transmitter 105 modulates the two-point modulation signal (i.e., the second baseband signal) to obtain a third digital radio frequency signal, and sends the third digital radio frequency signal through the digital transmitting antenna 106, so that other digital interphone terminals in the relay system network can receive the third digital radio frequency signal in a downlink manner.
In implementation, the first radio frequency signal transmitter 105 may adopt various transceiver transmitting devices such as an analog car platform in a conventional vehicle-mounted interphone and a receiving device in a handheld interphone, and by adding the first radio frequency signal transmitter 105 and the second baseband processor 104, an analog relay device can be transformed into a downlink relay device of a digital relay device for digital talkback; the second baseband processor 104 employs an HR _ CB600 chip, and is mainly configured to modulate the received third digital signal to obtain a third digital radio frequency signal.
The analog relay device 40 in the analog-to-digital relay system can also realize the conversion function from analog to analog, and after the relay, the power of the analog signal can be effectively increased, so that the transmission distance of the output radio frequency signal is longer. The following describes the procedure of the simulation relay device 40 for implementing simulation relay simulation.
Preferably, the simulation relay apparatus 40 further includes: an analog signal repeater 405, a second radio frequency signal transmitter 402 and an analog transmitting antenna 401;
an analog signal repeater 405 for transmitting the second analog audio signal to the second radio frequency signal transmitter 402 and transmitting the second analog audio signal to the voice digital-to-analog converting device 30;
and the second radio frequency signal transmitter 402 is configured to modulate the second analog audio signal to obtain a third analog radio frequency signal, and transmit the third analog radio frequency signal through the analog transmitting antenna 401.
Fig. 4 is a schematic diagram of an internal structure of the simulation relay apparatus according to the embodiment of the present invention; the simulation relay apparatus 40 further includes: an analog signal repeater 405 and a second radio frequency signal transmitter 402.
Specifically, after the second radio frequency signal receiver 403 receives an air interface radio frequency signal (i.e., a second analog radio frequency signal) sent by the uplink analog interphone through the analog signal receiving antenna 404 and demodulates the air interface radio frequency signal (i.e., the second analog radio frequency signal) into a second analog audio signal, the analog signal repeater 405 sends the obtained second analog audio signal to the second radio frequency signal transmitter 402, and after the second radio frequency signal transmitter 402 receives the second analog audio signal sent by the analog signal repeater 405, the second analog audio signal is modulated into a third analog radio frequency signal and sent through the analog transmitting antenna 401, so that other analog interphone terminals in the relay system network receive downlink.
In implementation, the second radio frequency signal transmitter 402 may be used as various transmitter devices of the walkie-talkie, such as a simulation platform in a conventional vehicle-mounted walkie-talkie and a transmitter device in a handheld walkie-talkie, and the second radio frequency signal transmitter 402 and the simulation transmitting antenna 401 together form a simulation relay downlink device.
In addition to the first and second relay systems, embodiments of the present invention further provide a relay system for digital-to-analog conversion, which is described in detail below.
A third relay system for digital-to-analog conversion;
the relay system of the third interphone provided by the embodiment of the invention comprises the relay system of the first interphone and the relay system of the second interphone. That is to say, the system can realize both digital-to-analog and analog-to-digital functions, i.e. a digital-to-analog hybrid networking system, which not only can complete the relay communication between the traditional analog interphone and the novel digital interphone, but also can realize the hybrid communication between the analog interphone terminal and the digital interphone terminal; the third relay system can well support the stable transition from analog to digital communication of the interphone, ensure the effective mixed group communication between the traditional analog interphone and the novel digital interphone and further save the updating cost of the whole system. Fig. 5 is a schematic diagram of an overall structure of a relay system according to an embodiment of the present invention; i.e. the devices in the first and second relay systems are combined. Wherein the control device 20 and the voice digital-to-analog conversion device 30 are connected by I2And the S interface carries out communication.
In the actual production and manufacturing process, the digital transmitting antenna and the digital receiving antenna related in the embodiment of the invention can be combined into one antenna by adding a duplexer according to the requirement; the analog transmitting antenna and the analog receiving antenna related in the embodiment of the invention can use separate antennas, and duplexers are added according to needs to be combined into one antenna, so long as the functions of four antennas can be realized respectively.
In the actual production and manufacturing process, production can be carried out according to the needs, and as five functions are mainly included in the embodiment of the invention, namely five functions of digital-to-analog conversion, analog-to-digital conversion, digital-to-digital conversion, analog-to-analog conversion, digital-to-analog conversion and digital-to-analog conversion, the user can respectively produce equipment containing all or part of the functions of the invention according to the needs.
Based on the same inventive concept, the embodiment of the invention also provides a signal conversion method of the interphone, and as the principle of the problem solved by the method is similar to the relay system of the interphone, the implementation of the method can be referred to the implementation of the system, and repeated parts are not repeated.
The method for converting the signals of the interphone, provided by the embodiment of the invention, as shown in fig. 6, specifically comprises the following steps:
The signal conversion method of the interphone is a signal conversion method of a third relay system for digital-to-analog conversion, and the specific implementation process is actually a process of combining the first relay system and the second relay system, so repeated parts are not repeated.
For more detailed description, specific flowcharts of two methods of digital-to-analog conversion and analog-to-digital conversion are given below, and as shown in fig. 7, a flowchart of a signal conversion method from digital to analog according to an embodiment of the present invention, that is, a flowchart of a method corresponding to the first relay system is provided.
step 703, a signal converter in the control device analyzes the received first digital signal to obtain a digital signaling and a digital voice, and performs voice decompression on the digital voice to obtain a first PCM signal;
and 707, after receiving the first trigger signal sent by the voice digital-to-analog conversion device, a second radio frequency signal transmitter in the analog intermediate conversion device modulates the first analog audio signal into a first analog radio frequency signal, and sends the first analog radio frequency signal through an analog sending antenna.
Fig. 8 is a flowchart of an analog-to-digital signal conversion method according to an embodiment of the present invention, that is, a flowchart of a method corresponding to the second relay system.
step 806, after receiving the third digital signal sent by the control device, a second baseband processor in the digital relay device encodes and modulates the third digital signal to obtain a second baseband signal, and sends the second baseband signal to the first radio frequency signal transmitter;
in step 807, after receiving the second baseband signal sent by the second baseband processor, the first radio frequency signal transmitter in the digital relay device modulates the second baseband signal to obtain a second digital radio frequency signal, and sends the second digital radio frequency signal through the digital transmitting antenna.
Aiming at the signal conversion method of the interphone, the method also comprises a method for converting digital signals into digital signals.
Preferably, after receiving the first digital signal sent by the digital relay device, the control device further includes:
the control equipment analyzes the first digital signal to obtain a second digital signal, and sends the second digital signal to the digital transfer equipment;
and the digital relay equipment modulates the received second digital signal to obtain a second digital radio frequency signal and sends the second digital radio frequency signal through a digital transmitting antenna.
The specific implementation process of the method is similar to the process of converting numbers into numbers introduced in the system, and is not described herein again.
Fig. 9 is a flowchart of a method for converting digital signals into digital signals according to an embodiment of the present invention.
Step 901, after a first radio frequency signal receiver in the digital relay device receives a first digital radio frequency signal through a digital receiving antenna, demodulating the first digital radio frequency signal to obtain a first low intermediate frequency signal, and sending the first low intermediate frequency signal to a first baseband processor;
step 903, a signal converter in the control device analyzes the received first digital signal to obtain a digital signaling and a digital voice, and framing the digital signaling and the digital voice again to obtain a second digital signal;
step 904, the digital signal repeater in the control device sends the second digital signal obtained by framing again by the signal converter to the digital relay device;
step 906, after receiving the first baseband signal sent by the second baseband processor, the first radio frequency signal transmitter in the digital relay device modulates the first baseband signal to obtain a second digital radio frequency signal, and sends the second digital radio frequency signal through the digital transmitting antenna.
Aiming at the signal conversion method of the interphone, the method also comprises a method for realizing analog-to-analog conversion.
Preferably, after the analog intermediate conversion device converts the second analog radio frequency signal into the second analog audio signal, the method further includes:
and the analog transfer equipment modulates the second analog audio signal to obtain a third analog radio frequency signal, and sends the third analog radio frequency signal through the analog transmitting antenna.
The specific implementation process of the method is similar to the simulation-to-simulation process introduced in the system, and is not described herein again.
Fig. 10 is a flowchart of a signal conversion method from analog to analog according to an embodiment of the present invention.
Step 1001, after receiving the first analog radio frequency signal through an analog receiving antenna, a second radio frequency signal receiver in the analog transfer device converts the first analog radio frequency signal into a second analog audio signal;
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
Claims (8)
1. A relay system of an intercom, the system comprising: the system comprises a digital transfer device, a control device, a voice digital-to-analog conversion device and an analog transfer device; wherein, the digital transfer equipment is connected with the control equipment; the control equipment is connected with the voice digital-to-analog conversion equipment; the voice digital-to-analog conversion equipment is connected with the analog transfer equipment;
the digital relay equipment is used for converting the received first digital radio frequency signal into a first digital signal; and the digital relay apparatus includes: the second baseband processor, the first radio frequency signal transmitter and the digital transmitting antenna; the second baseband processor is configured to encode and modulate a received second digital signal sent by the digital signal repeater to obtain a first baseband signal, and send the first baseband signal to the first radio frequency signal transmitter; the first radio frequency signal transmitter is used for modulating the first baseband signal to obtain a second digital radio frequency signal and transmitting the second digital radio frequency signal through a digital transmitting antenna;
the control apparatus includes: a signal converter and the digital signal repeater; the signal converter is used for analyzing the first digital signal to obtain a digital signaling and a digital voice, framing the digital signaling and the digital voice again to obtain a second digital signal, and performing voice decompression on the digital voice to obtain a first Pulse Code Modulation (PCM) signal; the digital signal repeater is used for sending the second digital signal to the digital transfer equipment and sending the first PCM signal to the voice digital-to-analog conversion equipment;
the voice digital-to-analog conversion device is used for converting the first PCM signal into a first analog audio signal;
the analog transfer device is used for converting the first analog audio signal into a first analog radio frequency signal and sending the first analog radio frequency signal.
2. The system of claim 1, wherein the digital relay apparatus comprises: the system comprises a first radio frequency signal receiver, a digital receiving antenna and a first baseband processor;
the first radio frequency signal receiver is configured to demodulate a first digital radio frequency signal received through a digital receiving antenna to obtain a first low intermediate frequency signal, and send the first low intermediate frequency signal to the first baseband processor;
the first baseband processor is used for demodulating and decoding the first low intermediate frequency signal to obtain a first digital signal.
3. The system as recited in claim 1, wherein said control device further comprises: the first trigger is used for sending a first trigger signal to the analog transfer equipment;
the simulation transfer device comprises: a second radio frequency signal transmitter and an analog transmitting antenna;
and the second radio frequency signal transmitter is used for modulating the first analog audio signal into a first analog radio frequency signal after receiving the first trigger signal and transmitting the first analog audio signal through an analog transmitting antenna.
4. An intercom relay system comprising the intercom relay system according to any one of claims 1 to 3 and an intercom relay system comprising: the system comprises a digital transfer device, a control device, a voice digital-to-analog conversion device and an analog transfer device; wherein, the digital transfer equipment is connected with the control equipment; the control equipment is connected with the voice digital-to-analog conversion equipment; the voice digital-to-analog conversion equipment is connected with the analog transfer equipment;
the analog transfer equipment is used for converting the second analog radio frequency signal into a second analog audio signal;
the voice digital-to-analog conversion device is used for converting the second analog audio signal into a second PCM signal;
the control device is used for converting the second PCM signal into a third digital signal;
and the digital transfer equipment is used for converting the third digital signal into a third digital radio frequency signal and sending the third digital radio frequency signal.
5. The system as recited in claim 4, wherein said analog relay device comprises: a second radio frequency signal receiver and an analog receiving antenna;
the second radio frequency signal receiver is configured to convert the first analog radio frequency signal received through the analog receiving antenna into a second analog audio signal, and send the second analog audio signal to the voice digital-to-analog conversion device.
6. The system of claim 5, wherein the analog relay device further comprises: the analog signal repeater, the second radio frequency signal transmitter and the analog transmitting antenna;
the analog signal repeater is used for sending a second analog audio signal to the second radio frequency signal transmitter and sending the second analog audio signal to the voice digital-to-analog conversion equipment;
and the second radio frequency signal transmitter is used for modulating the second analog audio signal to obtain a first analog radio frequency signal and transmitting the first analog radio frequency signal through an analog transmitting antenna.
7. The system of claim 5, wherein the analog relay device further comprises: the second trigger is used for sending a second trigger signal to the control equipment;
the control apparatus includes: a signal converter and a digital signal repeater;
the signal converter is used for compressing and reframing the second PCM signal to obtain a third digital signal after receiving a second trigger signal;
the digital signal repeater is used for sending the third digital signal to the digital transfer equipment;
the digital relay apparatus further includes: the second baseband processor, the first radio frequency signal transmitter and the digital transmitting antenna;
the second baseband processor is configured to encode and modulate a third digital signal obtained by conversion by the control device to obtain a second baseband signal, and send the second baseband signal to the first radio frequency signal transmitter;
and the first radio frequency signal transmitter is used for modulating the second baseband signal to obtain a second digital radio frequency signal and transmitting the second digital radio frequency signal through a digital transmitting antenna.
8. A signal conversion method of an interphone is characterized by comprising the following steps:
after receiving the first digital radio frequency signal, the digital transfer equipment converts the first digital radio frequency signal into a first digital signal and sends the first digital signal to the control equipment; after receiving the third digital signal sent by the control device, a second baseband processor in the digital relay device encodes and modulates the third digital signal to obtain a second baseband signal, and sends the second baseband signal to a first radio frequency signal transmitter in the digital relay device; after receiving a second baseband signal sent by a second baseband processor, the first radio frequency signal transmitter modulates the second baseband signal to obtain a second digital radio frequency signal, and sends the second digital radio frequency signal through a digital transmitting antenna; after receiving a second digital signal sent by the digital signal transponder, the second baseband processor encodes and modulates the second digital signal to obtain a first baseband signal, and sends the first baseband signal to the first radio frequency signal transmitter; after receiving a first baseband signal sent by the second baseband processor, the first radio frequency signal transmitter modulates the first baseband signal to obtain a second digital radio frequency signal, and sends the second digital radio frequency signal through a digital transmitting antenna;
a signal converter in the control device analyzes the received first digital signal to obtain a digital signaling and a digital voice, performs voice decompression on the digital voice to obtain a first PCM signal, and performs framing on the digital signaling and the digital voice again to obtain a second digital signal; a digital signal repeater in the control equipment sends the first PCM signal to voice digital-to-analog conversion equipment and sends the second digital signal to the digital transfer equipment; after receiving a second PCM signal sent by the voice digital-to-analog conversion device, the signal converter converts the second PCM signal into a third digital signal, and the digital signal repeater sends the third digital signal to the digital relay device;
after receiving the first PCM signal sent by the control device, the voice digital-to-analog conversion device converts the first PCM signal into a first analog audio signal and sends the first analog audio signal to an analog relay device; after receiving a second analog audio signal sent by the analog relay device, converting the second analog audio signal into a second PCM signal, and sending the second PCM signal to the control device;
after receiving the first analog audio signal sent by the voice digital-to-analog conversion equipment, the analog transfer equipment modulates the first analog audio signal into a first analog radio frequency signal and sends the first analog radio frequency signal; and after receiving a second analog radio frequency signal, the analog intermediate conversion equipment converts the second analog radio frequency signal into a second analog audio signal and sends the second analog audio signal to the voice digital-to-analog conversion equipment.
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| CN106209550A (en) * | 2016-08-25 | 2016-12-07 | 武汉中元通信股份有限公司 | A kind of wire transmission communication means based on token-bus network and platform |
| CN110087329A (en) * | 2019-04-23 | 2019-08-02 | 四川瑞云信通科技有限公司 | A kind of method and device that analog- and digital- equipment special sound calling can be achieved |
| CN110266760A (en) * | 2019-05-17 | 2019-09-20 | 重庆市珞宾信息技术有限公司 | A kind of communication means and communication proxy system that cross-platform intercommunication can be achieved |
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