CN2713755Y - Acoustic control apparatus for bidirectional intercommunication system - Google Patents
Acoustic control apparatus for bidirectional intercommunication system Download PDFInfo
- Publication number
- CN2713755Y CN2713755Y CN 200420025944 CN200420025944U CN2713755Y CN 2713755 Y CN2713755 Y CN 2713755Y CN 200420025944 CN200420025944 CN 200420025944 CN 200420025944 U CN200420025944 U CN 200420025944U CN 2713755 Y CN2713755 Y CN 2713755Y
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- CN
- China
- Prior art keywords
- microphone
- noise
- output
- voltage comparator
- interior
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Abstract
The utility model relates to an acoustic control apparatus for bidirectional intercommunication system, and the main technical characteristic is that the conventional bidirectional wired intercommunication system output and the noise receiving microphone output are simultaneously connected to a voltage comparator after they are magnified, and that the make and break of the inner and outer microphones is decided by the voltage comparator on the ground of their output condition. The outstanding advantage is that the directive property of the microphone is sharpened, and the anti-jamming ability is substantially improved. Meanwhile, the utility model also has the characteristics of low manufacturing cost and adjustable parameter, and is the ideal bidirectional intercommunication device at present for closed windows of traffic, finance, etc.
Description
Technical field
The utility model relates to a kind of closed window with two-way wired intercom sound amplifier, belongs to electroacoustic
Technical field.
Background technology
At present, often effect is unsatisfactory for the two-way wired intercom sound amplifier that uses under some strong jammings, high noise environments, as the two-way wired intercom sound amplifier that uses at railway, the closed window in passenger traffic stations on highway box office, close because window is many, from the various machine sound of different directions, staff's voice, be superposed on the microphone, microphone forms and disturbs, often make that passenger's voice is intermittent, influenced the operate as normal of intercom system, also strengthened staff's labour intensity.
The utility model content
The purpose of this utility model provides and a kind ofly can improve two-way wired intercom and amplify that built-in microphone is anti-interference, the two-way intercom system sound-controlled apparatus of Noise Resistance Ability.
The utility model comprises that inside and outside microphone, amplifier, electronic switch, main frame, loud speaker, noise receive microphone, amplifier and voltage comparator, the output of noise reception microphone and the output of interior microphone are connected to the input of voltage comparator respectively through amplifier, the output of voltage comparator connects the electronic switch of inside and outside microphone respectively.
Further feature of the present utility model is that its noise receives microphone and can place in the main frame, also can disperse with main frame and put; It can be that electret sheet microphone also can be that moving-coil microphone or other are talked about body that noise receives microphone; It can be one or more that noise receives microphone.
At work, interior microphone is the unidirectivity microphone, is used for receiving the voice signal of staff in the box office, and it is the omnidirectional microphone that noise receives microphone, is used for receiving the noise signal in the box office, and outer microphone is used for receiving the voice signal of passenger outside the box office.Interior microphone faces staff's mouth, and the words that are subjected to that noise receives microphone face up, microphone a distance behind in being installed on.Interior microphone since from staff's mouth recently and over against mouth, thereby the voice signal maximum that receives.And when noise signal from the side or the back transfer in microphone and noise when receiving microphone because the unidirectivity of interior microphone, thus export less, and noise to receive microphone be the omnidirectional type, insensitive to direction, thereby output is bigger.Utilize above-mentioned feature, both are organically combined, form when interior microphone output receives microphone output greater than noise, interior microphone is switched on, and staff's sound is amplified, and closes outer microphone simultaneously.And when the output of noise reception microphone was exported greater than interior microphone, the unduly polite words that a friend is not expected to say socket joint was logical, and passenger's sound is amplified, and closes interior microphone simultaneously.Thereby this two-way intercommunication sound amplifier has only and just connects interior microphone when reaching certain intensity when staff's speech or from the sound in interior microphone the place ahead, other times are then closed, down periods unduly polite words that a friend is not expected to say socket joint is logical, thereby has avoided other noises in the box office to disturb the operate as normal of outer microphone.
Superior being of the present utility model: sharpening the directive property of microphone, improved anti-jamming capacity significantly, alleviated staff's labour intensity, simultaneously, it also has cheap, the characteristics that parameter is adjustable are desirable replacement device that bidirectional dialog that closed windows such as traffic, finance use is said system.
Description of drawings
Fig. 1 is the utility model theory diagram.
Fig. 2 is the schematic diagram of the utility model embodiment.
Specific embodiment
Among the figure, A is staff's the points of articulation of speaking, L
1Be the distance of the points of articulation to interior microphone; 1 is interior microphone; L
2Receive the distance of microphone to noise for interior microphone; 2 is loud speaker (2); 3 is main frame, and 4 are noise reception microphone; 5 are the glass sealing; 6 is outer microphone; 7 is loud speaker (1).Show that by figure staff's speech is through L
1Distance at first arrive in microphone 1, and then through L
2Distance just arrive noise and receive microphone 4, according to the characteristic of transfer voice decay as can be known, this moment, noise received the acoustic pressure that acoustic pressure that microphone 4 obtains obtains less than interior microphone 1 certainly, so the time in microphone 1 connection, outer microphone 6 is closed.And noise from the side, can regard as with respect to two microphones 1,4 distance equates, though all be sidetone for two microphones, and the words distance that is subjected to of two microphones equates, but because the former is a unidirectional microphone, the latter is an omni-directional microphone, the signal that unidirectional microphone comes the side has certain decay, microphone 1 and noise received the output gain ratio of microphone 4 in the opening and close of interior in this state microphone 1 and outer microphone 4 depended on, if we are set under the situation of sidetone, noise receives the output of the output of microphone 4 greater than interior microphone 1, and to set this state be that interior microphone is closed level, at this moment in the conversation angle (angle of opening) of microphone just less than 90 °.Obviously, when we continued to strengthen both output differences, the conversation angle of interior microphone just was compressed, on the contrary broadening then.The noise signal that comes from behind at first arrives noise and receives microphone 4, passes through L then
2Distance just arrive in microphone 1, the one-way factor of microphone 1 in adding, thereby the output amplitude that noise receives microphone 4 is certainly greater than the output amplitude of interior microphone 1, so the time interior microphone 1 be closed, and outer microphone 4 is by open-minded.Because the relation of microphone corresponding output in certain acoustic pressure scope is linear, thereby the angle of conversing after both gains are determined also is determined thereupon.
Claims (4)
1, a kind of two-way intercom system sound-controlled apparatus, comprise inside and outside microphone, amplifier, electronic switch, main system and speaker, it is characterized in that also being provided with in the described device noise and receive microphone, amplifier and voltage comparator, the output of noise reception microphone and the output of interior microphone are connected to the input of voltage comparator respectively through amplifier, the output of voltage comparator connects the electronic switch of inside and outside microphone respectively.
2, two-way intercom system sound-controlled apparatus according to claim 1 is characterized in that noise can place in the main frame by receiving microphone, also can disperse with main frame and put.
3, two-way intercom system sound-controlled apparatus according to claim 1 is characterized in that it can be Electret condenser microphone that noise receives microphone, also can be moving-coil microphone.
4, two-way intercom system sound-controlled apparatus according to claim 1 is characterized in that it can be one or more that noise receives microphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420025944 CN2713755Y (en) | 2004-03-31 | 2004-03-31 | Acoustic control apparatus for bidirectional intercommunication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420025944 CN2713755Y (en) | 2004-03-31 | 2004-03-31 | Acoustic control apparatus for bidirectional intercommunication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2713755Y true CN2713755Y (en) | 2005-07-27 |
Family
ID=34870828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420025944 Expired - Fee Related CN2713755Y (en) | 2004-03-31 | 2004-03-31 | Acoustic control apparatus for bidirectional intercommunication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2713755Y (en) |
-
2004
- 2004-03-31 CN CN 200420025944 patent/CN2713755Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |