CN217159694U - Application system for elevator five-party analog talkback signal relay - Google Patents

Abstract

The utility model discloses an application system that five parties of elevator simulation talkback signal was relayed, talkback audio signal relay module, 2 parties to the car conversation including dialing signal relay module, surveillance center host computer audio signal relay module, well and talkback audio signal relay module, dialing signal relay module difference signal control connects surveillance center host computer audio signal relay module, well talkback audio signal relay module and 2 parties to the car conversation talkback audio signal relay module. The system has the characteristics of simple structure, high stability, good communication signal transmission, good tone quality, strong anti-interference performance and long transmission distance.

Description

Application system for elevator five-party analog talkback signal relay

Technical Field

The utility model relates to an electronic circuit specifically is an application system that five parties of elevator simulate intercom signal and relay.

Background

With the rapid development of social economy in China and the improvement of living standard of people, the elevator is widely applied as a transportation means in buildings. The elevator five-party intercom system is also called an elevator five-party intercom system and is used for realizing communication among five parties, namely a management center host, a car extension of an elevator car, a machine room extension of an elevator machine room, a car top extension at the top of an elevator and a pit extension at the bottom of the elevator, in the elevator intercom system. The elevator five-party intercom system has the characteristics of quick installation, simplicity in operation, quick response, clear tone quality and the like, and is widely applied to occasions such as community property, elevator monitoring, elevator intercom and the like.

However, with the electrical complication of the elevator environment, large-area cells are more and more, after the originally installed interphone is used for several years, the signal-to-noise ratio of the whole opposite side system is lowered greatly, the whole set of interphone is switched obviously unpreferably, so that the economic loss is reduced, and the problem of the signal ratio by using a relay matching access technology becomes a difficult problem in the field.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides an application system that five sides of elevator simulate intercom signal and relay, it has stability height, and conversation signal transmission is good, and tone quality is good, and interference immunity is strong, characteristics that transmission distance is far away.

The utility model provides an adopted technical scheme of its technical problem does: the application system comprises a dialing signal relay module, a monitoring center host audio signal relay module, a well talkback (comprising a machine room host, a car top extension, a car extension and a pit extension) audio signal relay module and a 2-party talkback audio relay module for car communication, wherein the dialing signal relay module is respectively in signal control connection with the monitoring center host audio signal relay module, the well talkback audio signal relay module and the 2-party talkback audio relay module for car communication.

Further, the dialing signal relay module adopts a DTMF standard code dialing circuit module.

Further, the monitoring center host audio signal relay module is composed of a BL34118 chip and an impedance transformer which are electrically connected.

Further, the well intercommunication audio signal relay module is composed of an LM386 power amplifier, an audio transformer and an adjustable resistor which are electrically connected.

Furthermore, 2 parties of the car communication talk over the telephone.

The utility model has the advantages that: the system has the characteristics of simple structure, high stability, good communication signal transmission, good tone quality, strong anti-interference performance and long transmission distance.

Drawings

FIG. 1 is a block diagram of the system of the present invention;

fig. 2a is a circuit diagram of the dialing signal relay module of the present invention;

fig. 2 b-fig. 2e are application circuit diagrams of the dialing signal relay module of the present invention;

fig. 3 is a circuit diagram of the monitoring center host audio signal relay module of the present invention;

fig. 4 is the utility model discloses an echo cancellation and impedance matching circuit to five sides talkbacks of well.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1, an application system for relaying an analog intercom signal in five elevator parties comprises a dialing signal relay module, a monitoring center host audio signal relay module, a hoistway intercom (comprising a machine room host, a car roof extension, a car extension and a pit extension) audio signal relay module and a 2-party intercom audio relay module for communicating with a car, wherein the dialing signal relay module is respectively in signal control connection with the monitoring center host audio signal relay module, the hoistway intercom audio signal relay module and the 2-party intercom audio relay module for communicating with the car.

As shown in fig. 2a, the dial signal relay module adopts a DTMF standard code dial circuit module, and dial signal relay is realized by changing the original level detection into DTMF standard code dial, and the DTMF code dial is flexible and has good capacity expansion, and can also be used for transmitting other information. The HT9200 outputs DTMF codes and then is connected with an LM386 power amplifier, so that the reliable transmission of lines with the distance of 0.75mm at the distance of 3KM can be realized. Dialing in this manner is more accurate and more distant than previous level dialing. HT9700 is a DTMF decoder, which decodes incoming signals. Fig. 2b shows a working principle circuit diagram of the dialing signal relay module for detecting an incoming call in the well talkback car, fig. 2c shows a working principle circuit diagram of the dialing signal relay module for on-hook in the well talkback, fig. 2d shows a working principle circuit diagram of the dialing signal relay module for detecting an incoming call in the well talkback, and HY-WDJ-L in the working principle circuit diagram is a well talkback bus; fig. 2e is a circuit diagram illustrating the working principle of the dial signal relay module in the hoistway walkie-talkie. As shown in fig. 2b-2e, U11 and U7 detect that a call signal from the hoistway talkback is received, U10 is an on-hook circuit of the hoistway talkback, Q1 is an on-hook circuit of the hoistway talkback, when an incoming call signal of the hoistway talkback is detected, the on-hook circuit of Q1 is triggered, the hoistway talkback is activated, and the incoming call signal is converted into a DTMF signal through U3 of fig. 2a and sent to the monitoring center. If the monitoring center dials to call the hoistway for talkback, the DTMF dialing signal of the monitoring center is transmitted to U9 of fig. 2, U9 is a chip for decoding the DTMF dialing signal, and after decoding, U9 executes Q1 starting operation on the hoistway or U10 hanging-up operation on the hoistway. This serves as a dial signal relay.

As shown in fig. 3, the monitoring center host audio signal relay module is composed of an electrically connected BL34118 chip and an impedance transformer T1. The impedance transformer T1 maximizes transmission as does the monitoring center host output voltage impedance. Fig. 3 shows an audio gain circuit and an impedance matching circuit for a monitoring center host, wherein the audio gain circuit can amplify an audio signal and output the amplified audio signal to the monitoring center host, the impedance matching circuit is composed of an output transformer, and the audio signal output to the monitoring center host is attenuated to the minimum after impedance matching, so that the audio signal is relayed to a monitoring center. The transformer T1 is impedance-requiring, and when its impedance is equal to that of the monitoring center main unit, the transmission attenuation is minimal. The transmission distance can be increased by using the coupling output of the transformer, and the communication distance can reach 3 KM. Meanwhile, the BL34118 chip has echo and AGC eliminating functions, which are huge in two-wire analog talkback, and sometimes the 2 functions determine the success or failure of the product. Better echo cancellation and AGC make the voice signal stable and stable, and no howling occurs in high-gain transmission.

Further, the well intercommunication audio signal relay module is composed of an LM386 power amplifier, an audio transformer and an adjustable resistor which are electrically connected.

Furthermore, 2 parties of the car conversation talk over the voice frequency relay module are directly transmitted in and connected with the car extension set through leading out an independent voice frequency output line, an independent voice frequency input line and an independent calling car control line without passing through a bus, and therefore the conversation and calling operation of the car extension set are achieved.

As shown in fig. 4, fig. 4 is an echo cancellation and impedance matching circuit for intercom in the intercom, and is also a switching circuit for 5-party call and 2-party call. The T2 transformer and the R41 adjustable resistor can play a role in eliminating echo. When voice is input from pins 1-2 of T2, since the center tap of the transformer is grounded, the 3 pins and the 5 pins have the same phase and the same number of turns, and when the adjustable resistor R41 is at the center position, the signal at the center position of R41 is 0. The signal of the remote monitoring center is input from the 5-pin of T2 after passing through 34118 and power amplification of U6 LM386, and the value of the center pin of R41 is close to 0 when R41 is adjusted to a proper position, so that the echo cancellation effect is achieved. The 1, 2 feet of the T2 can realize impedance matching with the shaft talkback, so that signals can be efficiently transmitted into the shaft talkback. The power amplifier LM386 is powered by 12V, and tests prove that 8V peak-to-peak voice signals can be transmitted to the hoistway talkback without howling. The defects of low sound volume and high noise of the hoistway talkback are greatly improved by the signal-to-noise ratio. The echo cancellation and impedance matching circuit of the 5-party talkback is an interface circuit connected to the talkback audio signal relay module, can adapt to the impedance of the hoistway talkback, and suppresses howling. Because the echo elimination and the impedance matching are realized, the audio signals on the hoistway talkback are transmitted to the hoistway talkback audio signal relay module with relatively less attenuation, and the signal relay of the hoistway talkback is realized.

The implementation of 2-way talk only to the car can be solved by switching with K2 of fig. 4. The difference between 2-way talkback only to the car and 5-way talkback is: the 2-party talkback voice signals do not pass through the 5-party talkback bus of the hoistway, and only realize talkback between the monitoring center and the car, and the 5-party talkback voice signals pass through the hoistway talkback bus. Firstly, for the load of the talkback system, 2 talkback loads of a car and a monitoring center are only provided in the whole system when the 2 party talkback works, and 5 talkback loads of a machine house host, a car top extension set, a car extension set, a pit extension set and a center host are provided in the whole system when the 5 party talkback works. In the signal disturbed condition, 2 car extension in the party talkbacks have an independent output line SP, an independent input line MIC, and the repeater has 2 corresponding line pair wiring respectively, and this group of signal does not pass through the well bus, and is disturbed for a short time, and 5 party's speech signal that talkbacks passes through the well bus, and well bus electrical environment is complicated, and the interference is big. Therefore, the 2-party talkback has clearer tone quality and better listening feeling than the 5-party talkback. Mode switching is realized through K2 switching.

The above mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made according to the claims and the description of the present invention are still included in the scope covered by the present invention.

Claims (5)

1. The application system for relaying the analog talkback signals of the five elevator parties is characterized by comprising a dialing signal relay module, a monitoring center host computer audio signal relay module, a well talkback audio signal relay module and a 2-party talkback audio relay module for calling a car, wherein the dialing signal relay module is respectively in signal control connection with the monitoring center host computer audio signal relay module, the well talkback audio signal relay module and the 2-party talkback audio relay module for calling the car.

2. The system of claim 1, wherein the dial signal relay module is a DTMF dial circuit module.

3. The system for applying the elevator pentagon analog talkback signal relay as claimed in claim 1, wherein the monitoring center host audio signal relay module is composed of a BL34118 chip and an impedance transformer which are electrically connected.

4. The system of claim 1, wherein the hoistway intercom audio signal relay module comprises an LM386 power amplifier, an audio transformer and an adjustable resistor which are electrically connected.

5. The system for applying the elevator five-party analog intercom signal relay as claimed in claim 1, wherein the 2-party intercom audio relay module for the car call is led out of an audio output line, an audio input line and a call car control line which are independent and directly connected with the car extension.

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