CN110225215B

CN110225215B - Method for realizing signal transmission between fire-fighting telephone main unit and extension set

Info

Publication number: CN110225215B
Application number: CN201910492665.1A
Authority: CN
Inventors: 不公告发明人
Original assignee: Sichuan Secair Security Technology Co ltd
Current assignee: Sichuan Secair Security Technology Co ltd
Priority date: 2019-06-06
Filing date: 2019-06-06
Publication date: 2020-12-29
Anticipated expiration: 2039-06-06
Also published as: CN110225215A

Abstract

The invention discloses a method for realizing signal transmission between a fire-fighting telephone host and extension sets, which comprises the steps that the fire-fighting telephone host sends a polling command to each fire-fighting telephone extension set in real time, and when the fire-fighting telephone host needs to communicate with the fire-fighting telephone extension set at a certain address, the fire-fighting telephone host sends a communication command to the address; the extension telephone set of the fire fighting generates ringing after receiving the instruction; the fire-fighting extension telephone returns an off-hook command to the fire-fighting telephone host after off-hook, when the fire-fighting telephone host starts to talk after detecting the off-hook command, the fire-fighting telephone host issues a signal in a digital modulation mode, and the fire-fighting extension telephone receives the signal issued by the fire-fighting telephone host, demodulates the signal and restores a voice signal through DAC processing; after the call is finished and the fire-fighting telephone is hung up, the fire-fighting telephone host puts the address of the fire-fighting extension telephone into the polling range again. Through the scheme, the invention achieves the purposes of high conversation quality and no interference, and has very high practical value and popularization value.

Description

Method for realizing signal transmission between fire-fighting telephone main unit and extension set

Technical Field

The invention belongs to the technical field of fire fighting, and particularly relates to a method for realizing signal transmission between a fire fighting telephone host and an extension telephone.

Background

The fire-fighting telephone is a special device for fire-fighting communication, can provide a convenient and quick communication means for people when a fire disaster occurs, and is an indispensable communication device in a fire-fighting control and alarm system. At present, most of common fire-fighting telephone hosts on the market are in bus mode, namely, the fire-fighting telephone hosts communicate with fire-fighting extension telephones in a two-bus mode, and signals are coupled to the buses in a coupling mode for transmission. The components used for signal coupling are common capacitors, echo can be generated during telephone conversation, certain trouble is caused to the conversation, signals transmitted on the bus are analog signals, and the signals are easily interfered in the transmission process, so that the conversation quality is influenced. Therefore, how to solve the technical defects in the prior art is a problem that needs to be solved urgently by the technical staff in the field.

Disclosure of Invention

The invention aims to provide a method for realizing signal transmission between a fire-fighting telephone host and an extension, which mainly solves the problems that voice signals are transmitted on a bus through analog signals in the prior art, and interference is easily caused in the transmission process, the conversation quality is influenced, and echo is generated at the same time.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a method for realizing signal transmission between a fire-fighting telephone host and an extension telephone comprises the following steps:

(S1) the fire-fighting telephone host sends a patrol command to each fire-fighting telephone extension in real time, and when the fire-fighting telephone host needs to communicate with the fire-fighting telephone extension at a certain address, the fire-fighting telephone host sends a communication command to the address;

(S2) the extension telephone set generates ringing after receiving the call command from the main telephone set;

(S3) when the extension telephone is off-hook, returning an off-hook command to the main telephone until the main telephone detects the off-hook command, starting a communication circuit, and starting communication between the main telephone and the extension telephone;

(S4) the fire-fighting telephone host sends signals in a digital modulation mode, samples, quantizes and encodes the voice signals, and modulates the voice signals and the patrol command together to a bus to transmit the voice signals to the fire-fighting telephone extension;

(S5) the extension telephone selects the low level time section in the bus signal, modulates the voice signal converted into the current signal to the bus and returns to the main machine of the fire-fighting telephone;

(S6) when the host computer of the fire-fighting telephone collects the low level of the bus, sampling is carried out, and the stable current signal is taken for voice restoration processing;

(S7) after receiving the signal sent by the fire telephone host, the fire telephone extension demodulates the signal and restores the voice signal through DAC processing;

(S8) repeating the steps (S4) to (S7) until the whole call is finished hanging up, the fire fighting telephone host closes the voice circuit and puts the fire fighting extension telephone address into the polling range again.

Further, in the step (S4), when the main and the extension of the fire fighting telephone start talking, the main fire fighting telephone still inspects the extension of the fire fighting telephone at other addresses in real time.

Specifically, the coding interval time in the step (S4) meets 100-125 us.

Compared with the prior art, the invention has the following beneficial effects:

(1) compared with the transmission mode of analog signals in the prior art, the invention adopts the digital transmission mode to well avoid the occurrence of the condition that the signal is interfered and the conversation quality is influenced in the transmission process, and effectively eliminates the echo by adopting the digital transmission mode, thereby being suitable for large-scale popularization.

(2) According to the invention, after the fire-fighting telephone host and the fire-fighting telephone extensions realize communication, the fire-fighting telephone host still inspects the fire-fighting telephone extensions with other addresses in real time, so that the condition that the fire-fighting telephone host misses responses with other fire-fighting telephone extensions when communicating with one of the fire-fighting telephone extensions is avoided, thus the comprehensive monitoring is realized, and the practicability is higher.

Drawings

FIG. 1 is a flow chart of the system architecture of the present invention.

FIG. 2 is a schematic diagram of waveforms according to the present invention.

Detailed Description

The present invention is further illustrated by the following figures and examples, which include, but are not limited to, the following examples.

Examples

As shown in fig. 1, a method for implementing signal transmission between a fire-fighting telephone host and an extension includes the following steps:

(S1) the fire fighting telephone host sends the polling command to each fire fighting extension telephone in real time, and when the fire fighting telephone host needs to communicate with the fire fighting extension telephone at a certain address, the fire fighting telephone host sends the communication command to the address.

(S2) the extension telephone responds to the call command from the main telephone, i.e. generates a ring to remind the corresponding staff to answer the call.

(S3) when the worker takes off the fire fighting extension telephone, the fire fighting extension telephone is separated from the base because of the handle, so the circuit board inside the fire fighting extension telephone returns the off-hook command to the fire fighting extension telephone host after detecting the relevant signal, and the talking circuit is opened after the fire fighting extension telephone host detects the off-hook command, and the talking between the fire fighting extension telephone host and the fire fighting extension telephone host starts.

(S4) in order to avoid the fire fighting host computer missing the other fire fighting extension telephone to request the call, the fire fighting host computer will still scan the extension telephone with other address in real time. The fire-fighting telephone host sends signals in a digital modulation mode, the voice signals are sampled, quantized and encoded and then modulated to the bus together with the patrol inspection command to be transmitted to the fire-fighting extension telephone, the situations that the signals are interfered, the conversation quality is influenced and echoes are generated when analog signal transmission is adopted in the prior art can be effectively avoided, the high-quality conversation effect is achieved, the digital signal encoding interval mode sent by the fire-fighting telephone host in the bus preferably selects signals with the sampling interval time of 100-125 us, the low level preferably selects signals with the 8-12V and the time interval preferably of 30us, and the waveform diagram of the signals is shown in figure 2.

(S5) the extension telephone selects the low level time section in the bus signal, and modulates the voice signal converted into the current signal to the bus to return to the main telephone.

(S6) when the host computer of the fire-fighting telephone collects the low level of the bus, sampling is carried out, and the stable current signal is taken to carry out voice reduction processing through the voice communication circuit and the realization method of the host computer of the fire-fighting telephone applied by the applicant.

(S7) after receiving the digital signal sent by the fire telephone host, the fire telephone extension demodulates the digital signal and restores the demodulated digital signal into an analog voice signal through DAC processing, wherein the DAC processing prefers a PWM mode.

(S6) repeating the steps (S4) to (S7) until the whole call is finished hanging up, the fire fighting telephone host closes the voice circuit and puts the fire fighting extension telephone address into the polling range again.

The invention is seemingly simple, is not easy to think of, and can be obtained only by fully researching the voice transmission characteristic of the fire telephone and paying creative labor according to the characteristic. It should be noted that the invention adopts the digital transmission mode to well avoid the occurrence of the condition that the signal is interfered and the conversation quality is influenced in the transmission process, and the digital transmission mode is adopted to effectively eliminate the echo. Therefore, compared with the prior art, the invention has obvious technical progress, and has outstanding substantive features and remarkable progress.

The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, but all changes that can be made by applying the principles of the present invention and performing non-inventive work on the basis of the principles shall fall within the scope of the present invention.

Claims

1. A method for realizing signal transmission between a fire-fighting telephone host and an extension telephone is characterized by comprising the following steps:

2. The method as claimed in claim 1, wherein the main fire telephone is configured to scan the extension telephone of another address in real time when the main fire telephone and the extension telephone start talking in step (S4).

3. The method for realizing signal transmission between the fire fighting telephone main unit and the extension set according to claim 2, wherein the coding interval time in the step (S4) is 100-125 us.