CN201611876U - Audio wireless transmission system for drive-in cinema - Google Patents
Audio wireless transmission system for drive-in cinema Download PDFInfo
- Publication number
- CN201611876U CN201611876U CN2010201518250U CN201020151825U CN201611876U CN 201611876 U CN201611876 U CN 201611876U CN 2010201518250 U CN2010201518250 U CN 2010201518250U CN 201020151825 U CN201020151825 U CN 201020151825U CN 201611876 U CN201611876 U CN 201611876U
- Authority
- CN
- China
- Prior art keywords
- frequency
- audio
- drive
- emission system
- theater
- 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 - Lifetime
Links
Images
Landscapes
- Circuits Of Receivers In General (AREA)
Abstract
The utility model provides an audio wireless transmission system for drive-in cinema, which at least includes a projector for projecting film image to the projection screen and a vehicle-mounted radio, wherein a field where the vehicle can be parked and people can watch films is provided to the projection screen, and an audio wireless transmission system for drive-in cinema is connected with the audio output terminal of the projector. The audio wireless transmission system of the utility model can automatically scan, save, and display the frequency that has not been interfered, so that it can scan an empty frequency through push-button simultaneously when sensing the interference, and simultaneously the emission frequency of the transmitter is switched to the frequency, to transmit the audio signal of the film, to largely improve the anti-jamming capability of the audio wireless transmission system for drive-in cinema, and to alleviate the labor for searching the empty emission frequency.
Description
Technical field
The utility model relates to a kind of audio wireless emission system, and especially a kind of audio wireless emission system that is used for drive-in theater, this audio wireless emission system can convert the audio signal of film to buy car in installments carries the wireless signal of broadcast receiver uppick.
Background technology
Drive-in cinema (drive-in or drive-in theater), promptly spectators are sitting in separately the automobile and listen to and watch open-air cinema by broadcast receiver.The first hand drive-in theater built up the first transaction of a day's business in 1933 at N.J. in the world.It is actually a huge parking lot, can hold 400 automobiles, and the four sides retaining has enclosure wall.The place ahead, square hangs up screen, and the screen area is 40 meters * 30 meters, is founding many pillars that headset plug is housed in.Spectators are driving automobile and are entering in the field, are parked in the pillar next door, plug in the earphone, and just can see a film.
For realizing listening to the film audio frequency by vehicle-mounted radio, drive-in theater generally is equipped with the audio wireless emission system, be used to read the track of film and convert thereof into wireless signal transmission and go out, the spectators of viewing are apprised of the frequency of this wireless signal, then the wireless frequency in the own car are adjusted to this frequency and just can listen to the film audio frequency in car.
There are a lot of defectives in the audio wireless emission system of above-mentioned existing drive-in theater, one of them is, because the cinema that the scope of drive-in theater is more general is much bigger, therefore the audio wireless emission system need adopt bigger antenna usually, thereby the interference of the wireless device around being easy to suffer, and such interference source is not that beginning just can be predicted usually, and therefore such interference also is difficult to get rid of.
In addition, present vehicle electronic device also increases gradually, for example vehicle radio station, GPS navigation instrument, trailer-mounted radar or the like, after being fully parked with the vehicle that is equipped with these electronic equipments in a large number in the drive-in theater, various interference also quite bother, movie theatre needs a large amount of staff to solve problems such as suchlike noise, sound be unclear for spectators, has increased cost virtually.
Moreover, if in same drive-in theater, need to reflect simultaneously the multi-section film, then every film all needs to set the frequency of a different playing audio signal, when certain frequency appearance interference need be changed, usually need consideration both the frequency of other films not to be caused interference, find a suitable frequency again as early as possible, and notify spectators existing frequency.
But existing audio wireless emission system is difficult to find a preferable tranmitting frequency.Owing to audio signal will be launched by wireless mode, the tranmitting frequency that is provided with should be avoided local broadcasting frequency.And the frequency (not having occupied frequency) that will look for a sky is carried out wireless transmission, a frequency generally need at first be set launch, and the broadcast receiver with automobile comes confirmation of receipt then; If effect is bad, then needs to change a frequency and launch again, and then come confirmation of receipt with the broadcast receiver of automobile.So circulation, process complexity, very trouble.And to the end, set frequency also may not be best frequency.Secondly, when the frequency that has configured takes place to disturb, be difficult to usually interference source be found at once and get rid of, at this moment unique method is to reset an effective frequency, and notifies spectators to be transformed into this frequency and continue to watch at once.
But the operation that above-mentioned this action need of adjusting frequency bothers very much.Particularly, must tirelessly spend a large amount of time and efforts and seek empty frequency in the zone of a large amount of broadcast program of emission.
The utility model content
The technical problems to be solved in the utility model provides a kind of audio wireless emission system that is used for drive-in theater, to reduce or to avoid problem noted earlier.
For solving the problems of the technologies described above, the utility model proposes a kind of audio wireless emission system that is used for drive-in theater, this drive-in theater comprises that at least a projector and a chassis to screen projection film image carries broadcast receiver, be provided with a place of parking and watch film of to buy car in installments over against described screen, the audio output port of described projector is connected with an audio wireless emission system that is used for drive-in theater, wherein, described audio wireless emission system comprises:
A transmitter circuitry is used for the audio signal of taking from described projector is converted to the wireless signal in the radio broadcasting frequency band and is emitted to described vehicle-mounted radio;
Receiver circuit with at least one tuned cell;
The display of display frequency thereon;
A control circuit is used to control the tranmitting frequency of described transmitter circuitry and the receive frequency of described receiver circuit;
Described control circuit detects described receiver circuit and does not use frequency in described radio broadcasting frequency band, and described tranmitting frequency is set to the detected described frequency of not using, and makes described display show described tranmitting frequency simultaneously.
Preferably, described audio wireless emission system further comprises: a memory that is connected on the described control circuit is used to store the detected described frequency of not using.
Preferably, described wireless transmitting system further comprises a frequency channel-selection assembly, be used for described tranmitting frequency be tuned to the described tranmitting frequency that shows on the described display.
Preferably, described control circuit disconnects described transmitter circuitry when detecting empty frequency, connect described receiver circuit.
Audio wireless emission system of the present utility model can automatic scan, preservation and show the frequency that is not interfered, thereby almost can be in that feel just can be by the frequency of key scan to a sky when disturbing, tranmitting frequency with transmitter switches under this frequency simultaneously, with the audio signal of emission film.The staff of drive-in theater can be by the tranmitting frequency of the current demonstration of projection on motion picture screen, perhaps inform the tranmitting frequency that spectators are current by the form of broadcasting, allowing spectators in time the broadcast receiver of oneself be adjusted under the said frequencies listens to, thereby greatly improved the antijamming capability of the audio wireless emission system of drive-in theater, and alleviated the amount of labour of seeking empty tranmitting frequency.
Description of drawings
The following drawings only is intended to the utility model done and schematically illustrates and explain, does not limit scope of the present utility model.Wherein,
Fig. 1 shows is floor map according to the drive-in theater of a specific embodiment of the present utility model;
Fig. 2 shows is structural representation according to the audio wireless emission system of a specific embodiment of the present utility model;
Fig. 3 shows is operating process block diagram according to audio wireless emission system of the present utility model.
Embodiment
Understand for technical characterictic of the present utility model, purpose and effect being had more clearly, now contrast description of drawings embodiment of the present utility model.Wherein, identical parts adopt identical label.
Fig. 1 shows is floor map according to the drive-in theater of a specific embodiment of the present utility model, show at least one projector 1 among the figure, be used for to screen 2 projection film images, be provided with 3 places 4 of parking and watch film of to buy car in installments over against screen 2.The audio output port of projector 1 can connect the audio wireless emission system 5 that is used for drive-in theater according to of the present utility model.
Fig. 2 shows is structural representation according to the audio wireless emission system 5 of a specific embodiment of the present utility model.Audio wireless emission system 5 comprises a transmitter circuitry 40 and a receiver circuit 50.Transmitter circuitry 40 converts the audio signal that produces from projector 1 to can be for the wireless signal of broadcast receiver acceptance.
As shown in the figure, transmitter circuitry 40 contain an audio signal input end 42,42 ', 44, one wireless-modulated circuit 45 of a stereo multiplex electronics and an antenna 46.
Audio signal input end 42,42 ' respectively passes through the stereo multiplex electronics 44 of holding wire 43,43 ' import into the right channel sound signal " R " of input and L channel voice signal " L ".Stereo multiplex electronics 44 converts the above-mentioned audio signal of importing into to have with the existing constructed specification of wireless broadcast system stereo multiplex signal.
Wireless-modulated circuit 45 converts the stereo multiplex signal of taking from stereo multiplex electronics 44 to have with the existing constructed specification of wireless broadcast system wireless signal, then the wireless signal that is converted is applied on the antenna 46.Therefore, although Fig. 2 is not shown, wireless-modulated circuit 45 is handled by phase-locked loop circuit.Because stereo multiplex signal is applied on the voltage controlled oscillator of phase-locked loop circuit, therefore can realize wireless-modulated.In addition, the frequency dividing ratio of the variable division circuit by changing phase-locked loop circuit just can change tranmitting frequency.
Receiving circuit 50 comprises tuning circuit 51 and testing circuit 52.Although not shown in this figure, tuning circuit 51 has from antenna input circuit to the wireless demodulation circuit the internal circuit of determining the super-heterodyne system of being arranged on.The local oscillator circuit of this tuning circuit 51 is made of the voltage controlled oscillator of another phase-locked loop circuit.Because the frequency dividing ratio of the existing frequency dividing circuit that phase-locked loop circuit uses is changed, so the receive frequency in the radio broadcasting frequency band can become any receive frequency.
The receiving sensitivity of tuning circuit 51 can set in advance.In addition, whether the intermediate-freuqncy signal level that testing circuit 52 is used to detect reception is tuned to broadcast singal, and detection signal S52 is exported.This detection signal S52 can be used for tuning command signal.
Audio wireless emission system 5 comprise power interface 31,31 ', a voltage stabilizing circuit 32.The power line that path connects stereo multiplex electronics 44 and wireless-modulated circuit 45 is penetrated-collected to the lead-out terminal of voltage stabilizing circuit 32 through switching transistor 47.In addition, the lead-out terminal of voltage stabilizing circuit 32 is through the power line of penetrating-collect path connection tuning circuit 51 and testing circuit 52 of another switching transistor 57.In addition, in audio wireless emission system 5, be provided with the central processing unit 60 of control whole system.
Central processing unit shown in the figure 60 can adopt the 4bit central processing unit of the TC9322FA model of Toshiba Corp's manufacturing.The DC output voltage V 32 of voltage stabilizing circuit 32 is added on the central processing unit 60 as operating voltage.
Frequency dividing ratio is respectively from the lead-out terminal Q1 of central processing unit 60 and the variable division circuit in Q2 supply wireless-modulated circuit 45 and the tuning circuit 51.In addition, be used for another terminal Q3 supply tuning circuit 50 of the control signal of receiving sensitivity from central processing unit 60.In addition, control signal is from the lead-out terminal Q4 of central processing unit 60 and the base stage of Q5 supply transistor 47 and 57, and the detection signal of testing circuit 52 is supplied with the input terminal D1 of central processing unit 60.Also be provided with scanning button 61S on the central processing unit 60.In addition, LCD (LCD) 62 also is connected with central processing unit 60 with memory 63.With empty frequently relevant storage in the radio broadcasting frequency band in memory 63, simultaneously, the data relevant with the frequency of last setting (that is the data of the tranmitting frequency of using in preceding operation during outage) also have been stored in the memory 63.
Describe operating process of the present utility model with reference to the accompanying drawings in detail.
Fig. 3 shows is operating process block diagram according to audio wireless emission system 5 of the present utility model, and as shown in the figure, after power interface 31, the 31 ' energized of audio wireless emission system 5, voltage V32 supplies with central processing unit 60 as operating voltage.Therefore, the processing of the CPU of central processing unit 60 operation is from first step 101.At next procedure 102, each circuit part is initialised.
In step 103 thereafter, transistor 47 ends according to the output signal of the terminal Q4 of central processing unit 60, and transistor 57 is according to the output signal of the terminal Q5 of central processing unit 60 and conducting.Because transistor 47 ended in the moment of step 103 regulation, so the operating voltage of dc voltage V32 can not be added on wireless-modulated circuit 45 and the stereo multiplex electronics 44, thereby makes transmitter circuitry 40 enter non operating state.In addition, because transistor 57 conductings, so operating voltage delivers on tuning circuit 51 and the testing circuit 52, thereby makes receiver circuit 50 enter operating state.
At next procedure 104, to read from memory 63 about the data of up-to-date channel frequency, these frequency data are converted into the data about the frequency dividing ratio of corresponding receive frequency.These frequency dividing ratio data are supplied with tuning circuit 52, so that adjust the variable division circuit.Therefore, receive frequency is adjusted on the frequency of final channel.So in the moment of step 104 regulation, receiving circuit 50 receives operation on the tranmitting frequency that aforesaid operations uses.
In step 111, test by the inspection signal, whether on the frequency that step 104 is adjusted, enter non-broadcast state to determine the broadcasting station.In other words, whether check exists empty receive frequency.When having empty receive frequency, handle operation and enter step 112 from step 111.In step 112, transistor 47 is according to the output signal conducting of the terminal Q4 of central processing unit 60, and transistor 57 ends according to the output signal of the terminal Q5 of central processing unit 60.
Because dc voltage V32 is added on modulation circuit 45 and the stereo multiplex electronics 44 through transistor 47 as operating voltage on step 112, so transmitter circuitry 40 enters operating state.In addition, because transistor 57 ends, operating voltage can not be added on tuning circuit 51 and the testing circuit 52, thereby makes receiver circuit 50 enter non operating state.
In step 113, the frequency data of the final channel of the step 104 of reading from memory are delivered on the modulation circuit 45 so that adjust frequency changer circuit, so tranmitting frequency is adjusted on the frequency of final channel from terminal Q1.Therefore, restart wireless signal transmission on the frequency that transmitter circuitry 40 uses in aforesaid operations.
In step 114, the frequency data of the final channel of reading in above-mentioned steps 104 are converted into the video data of corresponding tranmitting frequency.This video data is supplied with LCD 62, and the tranmitting frequency that is provided with on the step 113 is shown with digital form on LCD 62.
For the receive frequency that is provided with in step 104 is used in situation on the step 111, handles operation and entering step 121 from step 111.In step 121, test, to determine whether next empty audio data is kept in the memory 63.When the next empty audio data of storage in the memory 63, handle operation and entering step 122 from step 121.In step 122, next empty audio data is read from memory 63, and after the empty audio data of the next one was converted into data about the frequency dividing ratio of the receive frequency corresponding with it, the frequency dividing ratio data were given tuning circuit 51, so that adjust the variable division circuit.Thereby receive frequency is adjusted on the next empty frequency.
Then, test, to determine whether the receive frequency that above-mentioned steps 122 is provided with is real frequently empty in step 111.If the receive frequency that is provided with is real frequently empty, then should the sky receive frequency be confirmed as tranmitting frequency from step 112 to step 114.In addition, this tranmitting frequency of determining shows on LCD 62.Otherwise if the receive frequency that is provided with is not real frequently empty, then step 121 and 122 definite processing operations repeat, and are frequently empty until finding.
When all frequencies of preserving in the memory 62 are not empty frequency, handle operation and entering next procedure 131 from step 121.In step 131, transistor 47 ends according to the output signal of terminal confession, and transistor 57 ends according to the output signal of terminal Q5.Therefore, transmitter circuitry 40 and receiver circuit 50 all enter non operating state.At next procedure 132, predetermined video data is given LCD 62.This LCD 62 shows does not then have the empty fact frequently.After this, flow process is returned step 122, to next empty frequently scanning.
By the above-mentioned steps flow process, audio wireless emission system of the present utility model can automatic scan, preservation and show the frequency that is not interfered, thereby almost can be in that feel just can be by the frequency of key scan to a sky when disturbing, the tranmitting frequency with transmitter switches to the audio signal that this frequency issues the radio shadow simultaneously.The staff of drive-in theater can be by the tranmitting frequency of the current demonstration of projection on motion picture screen, perhaps inform the tranmitting frequency that spectators are current by the form of broadcasting, allowing spectators in time the broadcast receiver of oneself be adjusted under the said frequencies listens to, thereby greatly improved the antijamming capability of the audio wireless emission system of drive-in theater, and alleviated the amount of labour of seeking empty tranmitting frequency.
The above only is the schematic embodiment of the utility model, is not in order to limit scope of the present utility model.Any those skilled in the art, equivalent variations, the modification of being done under the prerequisite that does not break away from design of the present utility model and principle and combining all should belong to the scope of the utility model protection.
Claims (4)
1. audio wireless emission system that is used for drive-in theater, this drive-in theater comprises that at least a projector and a chassis to screen projection film image carries broadcast receiver, be provided with a place of parking and watch film of to buy car in installments over against described screen, the audio output port of described projector is connected with an audio wireless emission system that is used for drive-in theater, it is characterized in that described audio wireless emission system comprises:
A transmitter circuitry is used for the audio signal of taking from described projector is converted to the wireless signal in the radio broadcasting frequency band and is emitted to described vehicle-mounted radio;
Receiver circuit with at least one tuned cell;
The display of display frequency thereon;
A control circuit is used to control the tranmitting frequency of described transmitter circuitry and the receive frequency of described receiver circuit;
Described control circuit detects described receiver circuit and does not use frequency in described radio broadcasting frequency band, and described tranmitting frequency is set to the detected described frequency of not using, and makes described display show described tranmitting frequency simultaneously.
2. the audio wireless emission system that is used for drive-in theater according to claim 1, it is characterized in that, described audio wireless emission system further comprises: a memory that is connected on the described control circuit is used to store the detected described frequency of not using.
3. the audio wireless emission system that is used for drive-in theater according to claim 1, it is characterized in that, described wireless transmitting system further comprises a frequency channel-selection assembly, be used for described tranmitting frequency be tuned to the described tranmitting frequency that shows on the described display.
4. the audio wireless emission system that is used for drive-in theater according to claim 1 is characterized in that, described control circuit disconnects described transmitter circuitry when detecting empty frequency, connect described receiver circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201518250U CN201611876U (en) | 2010-04-07 | 2010-04-07 | Audio wireless transmission system for drive-in cinema |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201518250U CN201611876U (en) | 2010-04-07 | 2010-04-07 | Audio wireless transmission system for drive-in cinema |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201611876U true CN201611876U (en) | 2010-10-20 |
Family
ID=42962511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201518250U Expired - Lifetime CN201611876U (en) | 2010-04-07 | 2010-04-07 | Audio wireless transmission system for drive-in cinema |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201611876U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109903584A (en) * | 2019-04-16 | 2019-06-18 | 大连海事大学 | Drive-in theater intelligent car position distribution system |
-
2010
- 2010-04-07 CN CN2010201518250U patent/CN201611876U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109903584A (en) * | 2019-04-16 | 2019-06-18 | 大连海事大学 | Drive-in theater intelligent car position distribution system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20120270514A1 (en) | Method and terminal for receiving fm radio signals | |
| JP2005130505A (en) | Apparatus and method for controlling broadcast channel using position information of mobile communication terminal | |
| CN111913683A (en) | Multi-channel sound control method, equipment, electronic equipment and storage medium | |
| US9300416B2 (en) | Live radio transformer | |
| CN201611876U (en) | Audio wireless transmission system for drive-in cinema | |
| CN201667650U (en) | Drive-in theater | |
| US11363328B2 (en) | Display apparatus and method of controlling the same | |
| CN202978969U (en) | Broadcast frequency switching device | |
| US20150195053A1 (en) | Radio broadcast playback method and apparatus | |
| JP2001285101A (en) | Digital broadcast receiver | |
| KR101802228B1 (en) | Operating method and apparatus for broadcasting in portable terminal | |
| KR101426948B1 (en) | Method and apparatus of contoroling Digital Multimedia Broadcasting channel | |
| US8060636B2 (en) | Content reproducing method and apparatus | |
| JPH07284030A (en) | Television receiver for mobile object | |
| JP2007074056A (en) | Television receiving system and mobile television receiver | |
| JPH10332398A (en) | Mobile terminal device for road traffic information communication system | |
| JP2005244568A (en) | Mobile phone and alarm output method of mobile phone, and program thereof | |
| KR100888032B1 (en) | An apparatus and a method for converting broadcasting channel using position information in a mobile terminal | |
| KR100998654B1 (en) | Display device for vehicle and method for outputting multimedia data using the same | |
| US20050288857A1 (en) | Vehicle multimedia navigation apparatus with dual audio output | |
| JPS6031332Y2 (en) | television receiver | |
| JPH0440181A (en) | On-vehicle video system device | |
| JPH0222815Y2 (en) | ||
| JP3061359U (en) | Signal switching device | |
| CN202166423U (en) | Navigation device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101020 |