CN204350099U

CN204350099U - A kind of communication system for GSM-R hand-held station

Info

Publication number: CN204350099U
Application number: CN201520039103.9U
Authority: CN
Inventors: 魏波
Original assignee: SHANGHAI FUDAN COMMUNICATION CO Ltd
Current assignee: SHANGHAI FUDAN COMMUNICATION CO Ltd
Priority date: 2015-01-20
Filing date: 2015-01-20
Publication date: 2015-05-20
Anticipated expiration: 2025-01-20

Abstract

The utility model describes a kind of communication system for GSM-R hand-held station, comprises microphone, echo suppresses chip, digital baseband, Analog Baseband, receiver, loud speaker and analog switch; Microphone wherein and digital baseband are all direct suppresses chip to be connected with echo, and echo suppresses chip to be connected with loud speaker with power amplifier by Analog Baseband successively, and Analog Baseband is also direct is connected with receiver, receiver and loud speaker all suppress chip to be connected by analog switch and echo in addition.Owing to have employed above-mentioned technology, the utility model suppresses chip and analog switch by being provided with echo, thus the echo can passed back by artificial selection receiver or loud speaker, again the ambient sound in source of sound and echo are weeded out, so just improve the hardware index of system, and then reduce the possibility that protocol layer exists potential safety hazard, and finally reach the object meeting GSM-R network and require.

Description

A kind of communication system for GSM-R hand-held station

Technical field

The utility model relates to field of mobile communication, particularly relates to a kind of communication system for GSM-R hand-held station.

Background technology

GSM-R hand-held station is the mobile communication equipment being exclusively used in railway GSM-R network system, is compatible with traditional GSM/GPRS mobile communication network.GSM-R mobile phone has friendly interface, is easy to expansion, can adapts to the advantage of railway GSM-R network development need.

At present, the existing communication system for GSM-R hand-held station is all adopt on the basis of civil gsm module, increase GSM-R function.But this kind of system Problems existing is more, the hardware index as a lot of cannot reach the requirement of the Ministry of Railways, thus causes protocol layer also to there is the danger of leak.

Utility model content

In order to solve the problem, the utility model provides a kind of communication system for GSM-R hand-held station, by specialized designs targetedly, thus effectively can improve the performance of system hardware.

Above-mentioned a kind of communication system for GSM-R hand-held station, comprises microphone, echo suppresses chip, digital baseband, Analog Baseband, receiver, loud speaker and analog switch; Described microphone and digital baseband are all direct suppresses chip to be connected with echo; Described echo suppresses chip to be connected with loud speaker with power amplifier by Analog Baseband successively, and described Analog Baseband is also direct to be connected with receiver; Described receiver and loud speaker all suppress chip to be connected by analog switch and echo.

In said system, described microphone comprises the first microphone and second microphone.

In said system, described echo suppresses chip to be FM2018-380 chip.

In said system, described analog switch is binary channel analog switch.

In said system, described digital baseband is CX805-32 chip.

In said system, described Analog Baseband is CX20524 chip.

Advantage of the present utility model and beneficial effect are: the utility model provides a kind of communication system for GSM-R hand-held station, chip and analog switch is suppressed by being provided with echo, thus the echo can passed back by artificial selection receiver or loud speaker, again the ambient sound in source of sound and echo are weeded out, so just improve the hardware index of system, and then reduce the possibility that protocol layer exists potential safety hazard, and finally reach the object meeting GSM-R network and require.

Accompanying drawing explanation

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the structured flowchart of communication system in the utility model.

Embodiment

Below in conjunction with drawings and Examples, embodiment of the present utility model is further described.Following examples only for clearly the technical solution of the utility model being described, and can not limit protection range of the present utility model with this.

As shown in Figure 1, the utility model describes a kind of communication system for GSM-R hand-held station, comprises microphone, echo suppresses chip 3, digital baseband 5, Analog Baseband 6, receiver 7, loud speaker 9 and analog switch 4;

Preferably, microphone comprises the first microphone 1 and second microphone 2, and this first microphone 1, as main microphone, is responsible for the input of call voice, and is positioned over the bottom of GSM-R hand-held station; Second microphone 2 is then as environment microphone, and effect is for system provides environment source of sound, and is positioned over the top of GSM-R hand-held station.

Wherein, the first microphone 1, second microphone 2 and digital baseband 5 are all direct suppresses chip 3 to be connected with echo; Meanwhile, echo suppresses chip 3 to be also connected with loud speaker 9 with power amplifier 8 by Analog Baseband 6 successively, thus better reaches the power required for loud speaker 9; In addition Analog Baseband 6 is also direct is connected with receiver 7.

Preferably, what echo suppressed chip 3 to adopt is FM2018-380 chip, and its effect is weeded out the ambient sound in source of sound and echo, thus effectively improves the tonequality of recording; Meanwhile, echo suppresses chip 3 to be controlled by digital baseband 5, so digit chip 5 have employed the comparatively powerful CX805-32 chip of function; As for Analog Baseband 6 employing is CX20524 chip, is mainly responsible for the audio signal that reception of echoes suppresses chip 3 to be sent into, then is sent by radio circuit, receive simultaneously and play by the audio signal of radiofrequency signal be passed back.

Further, above-mentioned receiver 7 and loud speaker 9 all suppress chip 3 to be connected by analog switch 4 and echo; Preferably, this analog switch 4 is binary channel analog switch, thus can by the echo manually selecting receiver 7 or loud speaker 9 to pass back, then suppress chip 3 ambient sound in source of sound and echo to be weeded out by echo, and reach with this object improving system hardware index.

In actual use: echo suppresses two work of chip 3 primary responsibility, specific as follows:

First be remove environmental noise, because when the first microphone 1 and second microphone 2 receive the ambient sound of people's one's voice in speech and surrounding simultaneously.Now the first microphone 1 is near the face of people, so the sound of people is more much larger than ambient sound; In like manner, because second microphone 2 is on the top of loom, so away from the face of people, the sound of people can be relatively much little, almost identical with ambient sound, thus echo can be utilized to suppress chip 3 to possess utilize the time difference to reject unwanted audio signal and only retain the function of needs part, namely remove ambient sound and retain people's one's voice in speech.

Next removes unnecessary echo, because the sound that receiver 7 and loud speaker 9 send also can enter in two microphones, will this sound be brought into system concurrency see off if do not processed, thus cause the other side cannot not hear the sound of oneself, be i.e. so-called echo interference.In order to remove this type of echo, echo suppresses chip 3 to utilize to there is a time difference between the voice signal that loud speaker 9 is brought into sound microphone and first time receives the other side from Analog Baseband 6, thus source of sound is divided into a lot of section and carries out collection and compare, find identical part simultaneously, and this part is exactly the echo that loud speaker 9 is brought in microphone, and then can be removed and be obtained a pure source of sound.

Suppress as echo the functions such as the internal algorithm of chip 3 and acoustic processing to be the function that carries of chip, the utility model for make any improvement or design to it, and be that new design has been made to the component layouts of whole communication system and structure.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.

Claims

1. for a communication system for GSM-R hand-held station, it is characterized in that, comprise microphone, echo suppresses chip, digital baseband, Analog Baseband, receiver, loud speaker and analog switch; Described microphone and digital baseband are all direct suppresses chip to be connected with echo; Described echo suppresses chip to be connected with loud speaker with power amplifier by Analog Baseband successively, and described Analog Baseband is also direct to be connected with receiver; Described receiver and loud speaker all suppress chip to be connected by analog switch and echo.

2. a kind of communication system for GSM-R hand-held station as claimed in claim 1, it is characterized in that, described microphone comprises the first microphone and second microphone.

3. a kind of communication system for GSM-R hand-held station as claimed in claim 1, is characterized in that, described echo suppresses chip to be FM2018-380 chip.

4. a kind of communication system for GSM-R hand-held station as claimed in claim 1, it is characterized in that, described analog switch is binary channel analog switch.

5. a kind of communication system for GSM-R hand-held station as claimed in claim 1, it is characterized in that, described digital baseband is CX805-32 chip.

6. a kind of communication system for GSM-R hand-held station as claimed in claim 1, it is characterized in that, described Analog Baseband is CX20524 chip.