CN101056382A - One-time modulation and co-frequency synchronization transfer method and system of audio and video signals - Google Patents
One-time modulation and co-frequency synchronization transfer method and system of audio and video signals Download PDFInfo
- Publication number
- CN101056382A CN101056382A CN 200610109838 CN200610109838A CN101056382A CN 101056382 A CN101056382 A CN 101056382A CN 200610109838 CN200610109838 CN 200610109838 CN 200610109838 A CN200610109838 A CN 200610109838A CN 101056382 A CN101056382 A CN 101056382A
- Authority
- CN
- China
- Prior art keywords
- signal
- frequency
- base station
- audio
- adjacent transmission
- 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.)
- Granted
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a once-modulation co-frequency synchronization transmission method for wireless AV signals and a system thereof, capable of solving the problem of inference distortions of AV signals during co-frequency transmission. The method comprises: A. regulating the AV signals into first frequency carrier signals and transmitting the first frequency carrier signals to neighboring emission base stations; B. transforming the first frequency carrier signals into second frequency carrier signals used by the neighboring emission base stations; C. the neighboring emission base stations emitting the second frequency carrier signals to a receiver. The system comprises an AV signal modulating network, neighboring emission base stations and a receiver. The AV signal modulating network transforms the AV signals into f1 frequency carrier signals and transmits the f1 frequency carrier signals to the neighboring emission base stations, and the neighboring emission base stations comprises frequency carrier signals conversion unit which converts the f1 frequency carrier signals into f0 frequency carrier signals, and emits the f0 frequency carrier signals to the receiver. The invention is used for once-modulation co-frequency synchronization transmission of AV signals, and has advantages of weak co-frequency interference and low cost.
Description
Technical field
The present invention relates to the audio-video signal transmission field, relate in particular to a kind of audio-video signal one-time modulation and co-frequency synchronization transfer method and system.
Background technology
In order to realize that audio-video signal (broadcast singal, TV signal etc.) large tracts of land covers, method commonly used is to adopt many transmitters, with frequently carrying out the audio-video signal transmission.Make and realize in the audio-video signal zone of intersection of adjacent transmitters receiving synchronously, must make signal frequency, phase place, the modulation degree of adjacent transmitters all identical.
As shown in Figure 1, the audio-video signal of prior art is as follows with keeping pouring in the transferring technology scheme:
Audio-video signal is converted to the transmission carrier frequency by modulator;
Transfer signals to each adjacent transmission base station by transport vehicle;
In the adjacent transmission base station, at first the audio-video signal demodulation is come out, be modulated to each carrier-frequeney transmitter again.
As can be seen, technique scheme exists following problem:
Audio-video signal is after each base station carrier demodulation, modulation, various piece can produce distortion in various degree in demodulation, modulated process, relative error appears in the radio carrier frequency signal modulation degree that finally causes two base stations to be sent, and makes dynamic frequency, phase place, the frequency modulation of two base station signals difference occur.
In the prior art, because audio-video signal all will be through repeatedly modulation in each adjacent transmission base station, and the process of signal modulation is a nonlinear process, can cause signal distortion in various degree, the signal that therefore is difficult to adjacent base station is sent realizes that percentage modulation frequency, phase place are identical.Original technology implements the equipment cost height, and signal interference distortion in coherence area is big.
Summary of the invention
The invention provides a kind of audio-video signal one-time modulation and co-frequency synchronization transfer method and system, in order to solve the signal interference distortion problem that exists in the existing multiple spot modulation and co-frequency signal transmission.
The present invention program comprises:
A kind of audio-video signal one-time modulation and co-frequency synchronization transfer method comprises the steps:
A, send to each adjacent transmission base station after audio-video signal is modulated to first CF signal;
B, with the described first CF signal frequency conversion second CF signal that each adjacent transmission base station is used in each adjacent transmission base station;
C, described each adjacent transmission base station are transmitted into receiving terminal with described second CF signal.
Described step B may further comprise the steps:
B1, be intermediate-freuqncy signal with the described first CF signal frequency conversion;
B2, described intermediate-freuqncy signal is carried out filtering;
B3, that signal after the described filtering is carried out frequency of phase locking is synthetic, produces second CF signal.
Among described step B1, the B2, described intermediate-freuqncy signal comprises all signal variables of described first CF signal.
Among the described step C, described second CF signal comprises all signal variables of described first CF signal.
Distance to described receiving terminal equifield intensity point equates the transmitting terminal of described first CF signal through described each adjacent transmission base station.
Described step C is further comprising the steps of:
C1, the transmitting power of adjusting each described each adjacent transmission base station and/or antenna gain and/or antenna height, the field intensity that makes second CF signal arrive described receiving terminal equates.
Above-mentioned audio-video signal is broadcast singal or TV signal.
A kind of signal one-time modulation and co-frequency synchronous transmission system comprises:
Audio-video signal modulating network, each adjacent transmission base station and receiving terminal, described audio-video signal modulating network is converted to the f1 CF signal with audio-video signal and sends to each described each adjacent transmission base station, it is characterized in that, comprise the CF signal converter unit in described each adjacent transmission base station, described CF signal converter unit is the f0 CF signal with the frequency conversion of described f1 CF signal, and described f0 CF signal is transmitted into receiving terminal.
Described CF signal converter unit comprises:
The carrier frequency converter unit receives described f1 CF signal, and the frequency conversion of described f1 CF signal is become the f2 intermediate-freuqncy signal;
The intermediate frequency filtering unit receives described f2 intermediate-freuqncy signal, and described f2 intermediate-freuqncy signal is carried out filtering;
The frequency synthesis unit receives signal after the described filtering, and signal after the described filtering is synthesized, and produces described f0 CF signal;
Each distance to described acceptance point equates the transmitting terminal of described f1 CF signal through described each adjacent transmission base station.
Beneficial effect of the present invention is as follows:
The present invention uses frequency conversion to produce the method for audio-video signal carrier frequency owing to adopted primary modulation, and original audio-video signal has been carried out primary modulation, directly the frequency carrier frequency that uses by linear transformation frequency conversion generation broadcasting, TV base station transmit signals.The relative phase distortion of having avoided audio-video signal to produce owing to the multiple spot modulation in each audio frequency and video base station, the different caused distortions of frequency, phase place, modulation degree of having avoided audio-video signal between the adjacent tone video base station, to be produced.
The present invention is by the linear frequency conversion, avoided audio-video signal to be easy to generate the process of signal waveform distortion, utilized the space wave delivery lag to have solved the phase distortion that causes in equifield intensity district internal cause signal different delay through repeatedly modulation, demodulation, time-delay etc.This scheme has only been carried out primary modulation to primary signal, saved the very high coded modulation excitation set of specification requirement in each base station, so the hardware device cost of investment of this programme reduces obviously.
The present invention makes the audio frequency and video CF signal of each adjacent transmission base station generation not be easy to generate the process of signal waveform distortion through repeatedly modulation, demodulation, time-delay etc. by the step of carrier frequency frequency conversion, intermediate frequency filtering, frequency synthesis, therefore frequency, phase place, the frequency modulation of the audio-video signal carrier frequency that sends of each adjacent transmission base station all are identical, efficiently solve the interference distortion that the adjacent base station CF signal causes because of the frequency plot error in the equifield intensity district.Utilize free space electric wave delivery lag and adjust the method for launching the field intensity overlay area, solved the interference noise problem that signal lag produced simple and effectively.
Description of drawings
Fig. 1 is a prior art audio-video signal one-time modulation and co-frequency synchronization transfer method flow chart;
Fig. 2 is the inventive method flow chart;
The flow chart of Fig. 3 in the inventive method first CF signal being carried out frequency conversion;
Fig. 4 is a system architecture diagram of the present invention;
Fig. 5 is the flow chart of the embodiment of the invention one method;
Fig. 6 is the structured flowchart of embodiment of the invention two system;
Fig. 7 is each adjacent transmission base station and the locus figure that presents point and equifield intensity point in the embodiment of the invention two;
Fig. 8 is the signal coverage and the equifield intensity district schematic diagram of each adjacent transmission base station in the embodiment of the invention two.
Embodiment
Below in conjunction with Figure of description the specific embodiment of the present invention is described.
As shown in Figure 2, be the main flow schematic diagram of a kind of audio-video signal one-time modulation and co-frequency synchronization transfer method of the present invention, as seen from the figure, mainly may further comprise the steps:
S201, audio-video signal is modulated to first CF signal;
Be about to send to each adjacent transmission base station after audio-video signal is modulated to first CF signal, described audio-video signal is first CF signal through modulators modulate, and then with carrier-frequeney transmitter described first CF signal is sent to each adjacent transmission base station by transport vehicle;
Audio-video signal in the such scheme can be wireless audio and video signals such as broadcast singal, TV signal.
Transport vehicle in this step can comprise satellite-signal, optical fiber, wireless transmission signal etc.
S202, be second CF signal with the first CF signal frequency conversion;
Be second CF signal that each adjacent transmission base station is used with described first CF signal by the linear transformation frequency conversion promptly in each adjacent transmission base station.
Further described step S202 can also realize frequency conversion by following steps:
S301, be intermediate-freuqncy signal with the first CF signal frequency conversion;
Being about to the described first CF signal frequency conversion is intermediate-freuqncy signal, and this process is a linear process, can reduce the distortion that nonlinear transformation caused in the prior art by linear frequency conversion like this.
S302, intermediate-freuqncy signal is carried out filtering;
Promptly described intermediate-freuqncy signal is carried out filtering by intermediate-frequency filter.
S303, that signal after the filtering is carried out frequency of phase locking is synthetic;
Signal carries out frequency synthesis by frequency synthesizer after being about to described filtering, produces second CF signal.
Wherein, among described step S301, the S302, described intermediate-freuqncy signal comprises all signal variables of described first CF signal.
S203, second CF signal is transmitted into receiving terminal;
Be that described each adjacent transmission base station is transmitted into receiving terminal with described second CF signal.
Preferably, described step S203 is further comprising the steps of:
Adjust transmitting power and/or the antenna gain and/or the antenna height of each adjacent transmission base station, the field intensity that makes second CF signal arrive described receiving terminal equates.
Among described step S203, the S303, described second CF signal comprises all signal variables of described first CF signal.
Distance to described receiving terminal equifield intensity district equates the transmitting terminal of described first CF signal through described each adjacent transmission base station.
With the corresponding a kind of audio-video signal one-time modulation and co-frequency synchronous transmission system of said method, as shown in Figure 4, comprising:
Audio-video signal modulating network 401, each adjacent transmission base station 402 and receiving terminal 403;
Described audio-video signal modulating network 401 comprises:
Described each adjacent transmission base station 402 comprises:
CF signal converter unit 404, being used for the frequency conversion of described f1 CF signal is can be by the f0 CF signal of described each adjacent transmission base station 402 emission.
Preferably, described CF signal converter unit 404 also comprises:
Carrier frequency converter unit 407 receives described f1 CF signal, and the frequency conversion of described f1 CF signal is become the f2 intermediate-freuqncy signal;
Intermediate frequency filtering unit 408 receives described f2 intermediate-freuqncy signal, and described f2 intermediate-freuqncy signal is carried out filtering;
Described receiving terminal 403 is used for receiving the f0 CF signal, and it can be broadcast receiver.
Each distance to described receiving terminal 403 equates the transmitting terminal of described f1 CF signal through described each adjacent transmission base station, promptly in networking, covering requirement according to network, set the geographical position of the transmitting terminal of each adjacent transmission base station and f1 CF signal, try to achieve equidistant points (receiving terminal 403), promptly from the transmitting terminal of f1 CF signal through each adjacent transmission base station the equal in length to the space path of equidistant points, therefore only need to adjust transmitting power and/or the antenna gain and/or the antenna height of each adjacent transmission base station, the field intensity that allows the f0 CF signal arrive equidistant points equates, better in the audio-video signal sensation that receiving terminal receives, it is minimum that co-channel interference is reduced to.
Embodiment one:
When audio-video signal was stereo broadcasting signal, as shown in Figure 5, the realization of utilization the inventive method was as follows to the concrete steps that this stereo broadcasting signal carries out the one-time modulation and co-frequency synchronous transmission:
S501, stereo broadcasting signal is converted to composite signal;
Described stereo broadcasting signal is converted to described composite signal by stereophonic encoder;
S502, composite signal is modulated to the F1 CF signal;
Promptly described composite signal is modulated on the carrier frequency F1, and this F1 CF signal is transmitted into each adjacent transmission base station through the carrier frequency reflector;
S503, be the F2 intermediate-freuqncy signal with the frequency conversion of F1 CF signal;
Be about to described F1 CF signal and amplify frequency conversion, produce the F2 intermediate-freuqncy signal;
S504, the F2 intermediate-freuqncy signal is carried out filtering;
Promptly described F2 intermediate-freuqncy signal is carried out filtering by intermediate-frequency filter, and signal after the filtering is delivered to frequency synthesizer of phase locking;
F2 intermediate-freuqncy signal described in described step S503, the S504 comprises all signal variables of described F1 CF signal.
S505, signal after the filtering is carried out frequency synthesis;
Being about to after the described filtering signal, to carry out frequency of phase locking by frequency synthesizer synthetic, produces the F0 CF signal, and the reference frequency lockin signal of wherein said frequency synthesizer extracts from the F2 intermediate-freuqncy signal;
Described F0 CF signal comprises all signal variables of described F1 CF signal.
S506, adjustment transmitter index of correlation;
Promptly adjust transmitting power and/or the antenna gain and/or the antenna height of each described each adjacent transmission base station, described F0 CF signal is transmitted into receiving terminal, the field intensity that makes described F0 CF signal arrive described receiving terminal equidistant points equates;
S507, reception F0 CF signal;
Promptly receive described F0 CF signal at receiving terminal.
The transmitting terminal of described F1 CF signal arrives described receiving terminal through described each adjacent transmission base station the equal point of space length is an equidistant points, and the method for adjusting the power of above-mentioned each adjacent transmission base station is that the signal strength that arrives equidistant points is equated.
Embodiment two:
When audio-video signal was stereo broadcasting signal, as shown in Figure 6, utilization the present invention realized that the system that this stereo broadcasting signal is carried out the one-time modulation and co-frequency synchronous transmission comprises:
Stereo broadcasting signal modulating network 616;
Described stereo broadcasting signal modulating network 616 is used for the original stereo broadcast singal is modulated to the CF signal that each adjacent transmission base station is used, and this CF signal sent to each adjacent transmission base station, this stereo broadcasting signal modulating network 616 also comprises: stereophonic encoder 601, carrier-frequeney transmitter 602;
Transmitting base station A608;
Described transmitting base station A608 comprises: carrier frequency converter unit A607, transmitter A606;
Described carrier frequency converter unit A607 comprises: carrier frequency converter unit A603, intermediate frequency filtering unit A604, frequency synthesis unit A605;
Transmitting base station B614;
Described transmitting base station B614 comprises: carrier frequency converter unit B613, transmitter B612;
Described carrier frequency converter unit B613 comprises: carrier frequency converter unit B609, intermediate frequency filtering unit B 610, frequency synthesis unit B 611;
Receiving terminal 615.
To stereophonic encoder 601, stereophonic encoder 601 is converted to composite signal with left and right sound track signals to described stereo broadcasting signal by microwave transmission; This composite signal is modulated on the carrier frequency F1 ' through carrier-frequeney transmitter 602, and selected F1 ' carrier frequency frequency is 925MHZ, sends to transmitting base station A608 and transmitting base station B614; In transmitting base station A608 and transmitting base station B614, F1 ' CF signal is amplified frequency conversion generation F2 ' intermediate-freuqncy signal through carrier frequency converter unit A603 and carrier frequency converter unit B609 respectively, selected F2 ' intermediate frequency is 10MHZ, intermediate-frequency filter in intermediate frequency filtering unit A604 and intermediate frequency filtering unit B 610 carries out filtering respectively again, sends into the frequency synthesizer in frequency synthesis unit A605 and the frequency synthesis unit B 611 after the filtering respectively; Produce broadcasting carrier frequency F0 ' by frequency synthesizer, setting F0 ' broadcasting carrier frequency is 92.6MHZ, transmitter A606 and the transmitter B612 power set respectively in transmitting base station A608 and the transmitting base station B614 are 3 kilowatts, antenna gain is 8db, the transmitting antenna height above sea level of transmitting base station A608 is 200 meters, the transmitting antenna height above sea level of transmitting base station B614 is 350 meters, the transmitting terminal of F1 ' carrier frequency is made as feedback point K, the locus of feedback point K and transmitting base station A608 and transmitting base station B614 and space path are as shown in Figure 7, K is the position of feedback point K, D is the position of transmitting base station A608, E is the position of transmitting base station B614, and C is the receiving terminal position, and the distance of feedback point K and transmitting base station A608 is 50KM, the distance of feedback point K and transmitting base station B614 is 40KM, and the distance of transmitting base station A608 and transmitting base station B614 is 70KM.
According to the relation of KD+DC=KE+EC, try to achieve C point position, the derivation of formula KD+DC=KE+EC is as follows herein:
Signal when the transmitting power of two adjacent transmission base stations, antenna height, antenna gain equate fully covers as shown in Figure 8:
S801, S803 are respectively the signal coverage areas of two transmitting base stations, S802 is the signal equifield intensity district of described two transmitting base stations emission, if the arrival time delay of the signal of two transmitting base station emissions equates in the S802 district, and the frequency of these two signals, phase place, frequency deviation all equate, then just can not produce the co-channel interference distortion in the S802 district.
In networking, covering requirement according to network, set the geographical position of two adjacent transmission base stations and feedback point, try to achieve equidistant points, promptly from feedback o'clock through two adjacent transmission base stations the equal in length to the space path of equidistant points, therefore only need to adjust transmitting power, antenna gain, the antenna height of two adjacent transmission base stations, the field intensity that allows signal arrive equidistant points equates, will reduce to minimum in the co-channel interference of reception area.
The distance of therefore trying to achieve C point and transmitting base station A is 30KM, and the distance of C point and transmitting base station B is 40KM; Adjust the transmitting power of transmitter then, the transmitting power of transmitter A606 is 1.5 kilowatts, the transmitting power of transmitter B612 is 2.5 kilowatt hours, the broadcast singal field intensity of testing transmitting base station A emission at the C point respectively is 62db, the broadcast singal field intensity of transmitting base station B emission is 62db, this moment is better with the broadcast singal third dimension that stereo ceiver receives FM92.6, and fundamental sensation reaches the present invention program's invention effect less than co-channel interference.
Other audio-video signals such as TV signal etc. are similarly handled and are got final product.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1, a kind of audio-video signal one-time modulation and co-frequency synchronization transfer method is characterized in that, may further comprise the steps:
A, send to each adjacent transmission base station after audio-video signal is modulated to first CF signal;
B, be second CF signal that each adjacent transmission base station is used with the described first CF signal frequency conversion;
C, described each adjacent transmission base station are transmitted into receiving terminal with described second CF signal.
2, method according to claim 1 is characterized in that described step B may further comprise the steps:
B1, be intermediate-freuqncy signal with the described first CF signal frequency conversion;
B2, described intermediate-freuqncy signal is carried out filtering;
B3, that signal after the described filtering is carried out frequency of phase locking is synthetic, produces second CF signal.
3, as method as described in the claim 2, it is characterized in that among described step B1, the B2, described intermediate-freuqncy signal comprises all signal variables of described first CF signal.
4, method according to claim 1 is characterized in that among the described step C, described second CF signal comprises all signal variables of described first CF signal.
5, method according to claim 1 is characterized in that, the transmitting terminal of described first CF signal arrives described receiving terminal equifield intensity point through described each adjacent transmission base station distance equates.
6, method according to claim 1 is characterized in that described step C is further comprising the steps of:
Transmitting power and/or the antenna gain and/or the antenna height of C1, described each the adjacent transmission base station of adjustment, the field intensity that makes second CF signal arrive described receiving terminal equates.
7, as claim 1---6 any described methods is characterized in that described audio-video signal is broadcast singal or TV signal.
8, a kind of audio-video signal one-time modulation and co-frequency synchronous transmission system, comprise: audio-video signal modulating network, each adjacent transmission base station and receiving terminal, described audio-video signal modulating network is converted to the f1 CF signal with audio-video signal and sends to described each adjacent transmission base station, it is characterized in that, comprise the CF signal converter unit in described each adjacent transmission base station, described CF signal converter unit is the f0 CF signal with the frequency conversion of described f1 CF signal, and described f0 CF signal is transmitted into receiving terminal.
9, as system as described in the claim 8, it is characterized in that described CF signal converter unit comprises:
The carrier frequency converter unit receives described f1 CF signal, and the frequency conversion of described f1 CF signal is become the f2 intermediate-freuqncy signal;
The intermediate frequency filtering unit receives described f2 intermediate-freuqncy signal, and described f2 intermediate-freuqncy signal is carried out filtering;
The frequency synthesis unit receives signal after the described filtering, and it is synthetic that signal after the described filtering is carried out frequency of phase locking, produces described f0 CF signal.
As system as described in the claim 9, it is characterized in that 10, the transmitting terminal of described f1 CF signal arrives described receiving terminal equifield intensity point through described each adjacent transmission base station distance equates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610109838XA CN100508590C (en) | 2006-04-14 | 2006-08-16 | One-time modulation and co-frequency synchronization transfer method and system of audio and video signals |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610072159 | 2006-04-14 | ||
| CN200610072159.X | 2006-04-14 | ||
| CNB200610109838XA CN100508590C (en) | 2006-04-14 | 2006-08-16 | One-time modulation and co-frequency synchronization transfer method and system of audio and video signals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101056382A true CN101056382A (en) | 2007-10-17 |
| CN100508590C CN100508590C (en) | 2009-07-01 |
Family
ID=38795962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200610109838XA Active CN100508590C (en) | 2006-04-14 | 2006-08-16 | One-time modulation and co-frequency synchronization transfer method and system of audio and video signals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100508590C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101287079B (en) * | 2008-05-21 | 2010-09-08 | 周颖平 | Transmission method, system and device for broadcast television signal |
| CN101841362B (en) * | 2009-03-17 | 2013-05-01 | 河南晨星广电科技有限公司 | Radio frequency synchronous processing apparatus for CMMB (China Mobile Multimedia Broadcasting) |
| CN109587542A (en) * | 2018-12-27 | 2019-04-05 | 北京奇艺世纪科技有限公司 | Audio, video data synchronizer, method, data processing equipment, medium |
| CN115460425A (en) * | 2022-07-29 | 2022-12-09 | 上海赫千电子科技有限公司 | Audio and video synchronous transmission method based on vehicle-mounted Ethernet transmission |
-
2006
- 2006-08-16 CN CNB200610109838XA patent/CN100508590C/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101287079B (en) * | 2008-05-21 | 2010-09-08 | 周颖平 | Transmission method, system and device for broadcast television signal |
| CN101841362B (en) * | 2009-03-17 | 2013-05-01 | 河南晨星广电科技有限公司 | Radio frequency synchronous processing apparatus for CMMB (China Mobile Multimedia Broadcasting) |
| CN109587542A (en) * | 2018-12-27 | 2019-04-05 | 北京奇艺世纪科技有限公司 | Audio, video data synchronizer, method, data processing equipment, medium |
| CN109587542B (en) * | 2018-12-27 | 2020-11-27 | 北京奇艺世纪科技有限公司 | Audio and video data synchronization device, method, data processing device and medium |
| CN115460425A (en) * | 2022-07-29 | 2022-12-09 | 上海赫千电子科技有限公司 | Audio and video synchronous transmission method based on vehicle-mounted Ethernet transmission |
| CN115460425B (en) * | 2022-07-29 | 2023-11-24 | 上海赫千电子科技有限公司 | Audio and video synchronous transmission method based on vehicle-mounted Ethernet transmission |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100508590C (en) | 2009-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1152570C (en) | Multichannel radio frequency transmission system to deliver wide band digital data into independent sectorized service areas | |
| CN1162716C (en) | GPS receiver and portable communication device | |
| CN1914840A (en) | Optical signal transmission apparatus, system and method | |
| CN101056382A (en) | One-time modulation and co-frequency synchronization transfer method and system of audio and video signals | |
| CN1408184A (en) | In-building radio-frequency coverage | |
| CN1832593A (en) | Base station system | |
| CN1835489A (en) | Device and method able to compensate unbalance of same phase/orthogonal phase | |
| CN1223224C (en) | Ring shaped array antenna and method for using same | |
| CN1240230C (en) | Radio communication base station system including optical advanced base station | |
| CN101043274A (en) | Modulator-free optical millimeter wave generating method and full-duplex optical fiber wireless communication system | |
| CN1767377A (en) | Digital predistorter and predistortion method therefor | |
| CN1137710A (en) | Transmitter-receiver | |
| CN1745522A (en) | Wireless communication system | |
| CN1859033A (en) | System and its method for obtaining reference clock in frequency-shift repeater | |
| CN1222111C (en) | Two-way radio commuincation system and method | |
| CN1612555A (en) | Modulation apparatus for reducing time delay of on-channel repeater in terrestrial digital TV broadcasting system | |
| CN1926859A (en) | Apparatus and method for modulating of on-channel repeater | |
| CN1913393A (en) | Method and device for implementing whole-network base station synchronous of time division duplex system | |
| CN101247517A (en) | Mobile television signal subway tunnel covering system based on leakage cable | |
| CN1237797C (en) | Signal transmission method in digital television and broadcasting transinission system | |
| CN1512680A (en) | Regenerated relay repeater device and communication system using said device | |
| CN1297626A (en) | transmitter, receiver, and transmitting/receiving method | |
| CN101064707A (en) | Bandlimited stochastic sequence generating method and its apparatus | |
| CN101212638B (en) | On-channel audio/video signal transmission method and system | |
| CN200997657Y (en) | Audio/video frequency signal cospectral graph transmitter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20090821 Address after: 18, No. 61, Xuchang, Henan, China (461000) Patentee after: Zhou Yingping Address before: 18, No. 61, Xuchang, Henan, China (461000) Co-patentee before: Zhang Yuhong Patentee before: Zhou Ying Ping |
|
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Henan Xinghe Chen Yu Communication Technology Co., Ltd. Assignor: Zhou Yingping Contract fulfillment period: 2009.9.30 to 2016.9.30 contract change Contract record no.: 2010990000024 Denomination of invention: One-time modulation and co-frequency synchronization transfer method and system of audio and video signals Granted publication date: 20090701 License type: Exclusive license Record date: 2010.1.13 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.9.30 TO 2016.9.30; CHANGE OF CONTRACT Name of requester: HENAN PROVINCE XINGHE CHENYU COMMUNICATION SCIENCE Effective date: 20100113 |
|
| ASS | Succession or assignment of patent right |
Owner name: ZHENGZHOU BEES NETS MEDIA CO., LTD. Free format text: FORMER OWNER: ZHOU YINGPING Effective date: 20120424 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20120424 Address after: 6, building 461000, CCB building, 2 Datong Street, Henan, Xuchang Patentee after: Zhengzhou bee Net Media Co., Ltd. Address before: 461000 No. 61, No. 18, Henan, Xuchang (bureau of water conservancy) Patentee before: Zhou Yingping |
|
| ASS | Succession or assignment of patent right |
Owner name: BEIJING ZHONGSHI TONGPIN TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: ZHENGZHOU BEES NETS MEDIA CO., LTD. Effective date: 20150727 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150727 Address after: 100038 Central People's broadcasting station, 2 Fuxing street, Beijing, Xicheng District Patentee after: Beijing same frequency technology Co., Ltd. Address before: 6, building 461000, CCB building, 2 Datong Street, Henan, Xuchang Patentee before: Zhengzhou bee Net Media Co., Ltd. |