CN1234242C - Method of down-transmitting data in cable television network - Google Patents
Method of down-transmitting data in cable television network Download PDFInfo
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- CN1234242C CN1234242C CN 02110320 CN02110320A CN1234242C CN 1234242 C CN1234242 C CN 1234242C CN 02110320 CN02110320 CN 02110320 CN 02110320 A CN02110320 A CN 02110320A CN 1234242 C CN1234242 C CN 1234242C
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Abstract
The present invention provides a method for data transmission by using a cable television network and a device thereof. More specifically, non-television picture signal data which needs to be transmitted is encoded at a cable television signal transmission end; the non-television picture signal data is transmitted to a user end by using the frequency resource of an idle channel of a television; the user end can demodulate and decode received data signals and then transmit the data signals to a corresponding display controller. Thus, the transmission purpose of data transmission is realized.
Description
Technical field: the present invention relates to a kind of method and device thereof that utilizes cable TV network to carry out transfer of data.Particularly at the cable TV signal transmitting terminal, after the data of the non-television image signal of need transmission are encoded, modulate, to user side, user side is delivered to corresponding display control unit after the data-signal that receives is carried out demodulation, decoding processing with transfer of data.
Technical background: the channel of the cable TV of China is arranged between 49.75MHz～863.25MHz, has 95 channels, and the band width that each television channel had is 8MHz, and the frequency band of single channel anolog TV signals is 6.5MHz.The cable TV network of various places has autonomous system of one's own, does not take all television channels usually, and promptly most television channel is at leisure.Therefore, the business data transmission that the frequency resource of the television channel that utilization is idle is carried out non-television image signal is feasible, can not influence the TV signal transmission of available television channel.
Along with the raising day by day of people's quality of life, also more and more urgent to information requirement, traditional newpapers and periodicals, magazine lack certain ageing, and Internet is higher to operator's competency profiling, and all also there is a certain distance in these with the demand of ordinary consumer.Through shirtsleeve operation, only need cheap expense, enjoy abundant information, become a kind of of consumers in general and hoped for.
Summary of the invention: realization of the present invention is exactly at cable TV radio-frequency transmissions end, increase at least one data signal modulation device, it can carry out steering D/A conversion with the coded data signal of need transmission, and this signal is modulated in certain idle television channel on the rf frequency of determining, transmit through the cable TV transmission network network; User side at cable TV, but increase the demodulating equipment of a demodulated data signal, receive being modulated at data-signal on the rf frequency, demodulation process, to deliver to display unit or the control device that links to each other with demodulating equipment with the corresponding data-signal of coded data signal that receives again, realize the application purpose of transfer of data.
As everyone knows, the bandwidth of television channel is 8MHz, and the single channel low speed data signal of narrow-band FM mode, its frequency spectrum can be in 10kHz, if, then can in the bandwidth of 8MHz, arrange to reach 320 road such data-signals by the low speed data signal that 25kHz arranges the single channel narrow-band FM at interval.Such transfer of data is arranged on the idle television channel in the cable TV network, do not influence the transmission of existing or future TV signal, and the user in the service range of cable TV, all can use the data be transmitted by demodulating equipment, make its mode of receiving information many again a kind of selection.Therefore, on cable TV network, carry out the transfer of data of non-television image signal, carry out new business, have big economy of tool and social benefit prospect.
In addition, be 2400BPS with the message transmission rate, its actual active data transfer rate is 75Byte/s, promptly 75 characters of per second are about the 6M character by 24 hours single channel volumes of transmitted data, are equivalent to the informational capacity of 3,000,000 Chinese characters.For general user's application, such data volume is enough big, and different information can be classified, and carries out the transmission of multichannel data, and then the obtainable informational capacity of user side is very surprising.For the data processing of low speed, existing multiple existing mature technique can be utilized, and therefore, is feasible technically.
Description of drawings:
Fig. 1 is the formation schematic diagram of data sending terminal;
Fig. 2 is the formation schematic diagram of data receiver;
Fig. 3 is that the data sending terminal of embodiment 1 constitutes schematic diagram;
Fig. 4 is the spectrum data signal schematic diagram corresponding to embodiment 1;
Fig. 5 is that the data receiver of embodiment 1 constitutes schematic diagram;
Fig. 6 is that the data sending terminal of embodiment 2 constitutes schematic diagram;
Fig. 7 is the spectrum data signal schematic diagram corresponding to embodiment 2;
Fig. 8 is that the data receiver of embodiment 2 constitutes schematic diagram.
Describe below in conjunction with the thinking of accompanying drawing invention:
Referring to Fig. 1.Fig. 1 is a data sending terminal, i.e. the formation schematic diagram of front end.TV signal modulator (1) 1 among Fig. 1 and TV signal modulator (n) 2 are the television equipment of existing television headend, it is modulated at each road television image signal respectively on the different radio frequency carrier frequency in the television channel, send into again in the existing television headend equipment TV RF emitter 4, after carrying out power amplification by it, through the cable TV transmission network network, carry out signal to user side and send.TV RF emitter 4 has the multi-channel rf signal input part, can insert multichannel and meet the radiofrequency signal that tv channel frequency is arranged.
Need data through the transmission of cable TV transmission network network, after the encoded processing, incoming data signal modulator 3, carry out necessary rf modulations by data signal modulation device 3, be its rf frequency in the frequency range of certain idle television channel, the data-signal after rf modulations is sent into the radio-frequency (RF) signal input end of TV RF emitter 4, after being amplified by it, through the cable TV transmission network network, carry out the transmission of data-signal to user side.
Referring to Fig. 2.Fig. 2 is the formation schematic diagram of user side for data receiver.Among Fig. 2, through rf tv picture signal and the radio-frequency (RF) data signal that the cable TV transmission network network is sent here, insert in the signal branch device 1, be divided into two-way by its radiofrequency signal with input, the one tunnel sends in the existing television set of user, guarantees the rating of TV programme; Another road is sent in the demodulated data signal device 2, with demodulation, the decoding processing of practical radio-frequency (RF) data signal.
Demodulated data signal device 2 is made of following each several part.
A high/intermediate frequency amplifier 21: the radio-frequency (RF) data signal that its role is to signal branch device 1 is sent here is carried out tuning amplification, and the local oscillation signal that this signal and local oscillation circuit 23 are sent here carried out Frequency mixing processing, obtain the intermediate frequency data signal, and, send into frequency discrimination and data demodulator 22 with behind its further amplification;
Frequency discrimination and data demodulator 22: its role is to the intermediate frequency data signal of height/intermediate frequency amplifier 21 outputs is carried out frequency discrimination, demodulation, obtain coded data, and export data decode and signal processor 24 to;
Local oscillation circuit 23: its role is to produce local oscillated signal, and offer height/intermediate frequency amplifier 21, carry out Frequency mixing processing with radio-frequency (RF) data signal;
Data are decoded and signal processor 24: its role is to the data-signal of frequency discrimination and data demodulator output is handled, the data-signal that makes it to export is suitable for the different requirements of data presentation device or data control unit;
Data decode letter signal processor 24 also can have external control port and internal control line, with the reception external control signal, and then to the data-signal output form, or the internal circuit status of demodulated data signal device is controlled further.
From Fig. 2 as seen, height/intermediate frequency amplifier 21 inputs link to each other with the output of signal branch device 1 and local oscillation circuit 23 respectively, and its output links to each other with the input of frequency discrimination and data demodulator 22; The data output end of frequency discrimination and data demodulator 22 links to each other with the data input pin of data decode and signal processor 24; The data-signal output of data decode and signal processor 24 can be connected to data presentation device or data control unit, and can have the external control signal input, the exportable internal circuit that controls signal to.
As previously mentioned, in a cable television channels, can arrange the multichannel data signal.For the generation of the multichannel data that can in cable TV network, transmit, multiple mode can be arranged, the multichannel data signal that different modes generates, it correspondingly should have suitable mutually demodulation mode at user side.
Little or classification is not for a long time for need information transmitted amount, can adopt single channel data sheet radio frequency carrier frequency mode, be that each circuit-switched data is used different radio frequency carrier frequency, modulate by a plurality of separate data signal modulation devices, and a plurality of radio frequency carrier frequency are all in the 8MHz frequency band in same television channel, the radio-frequency (RF) data signal of multichannel data signal modulator exports the different port of TV RF emitter to, after being amplified by the TV RF emitter, transmits through the cable TV transmission network network;
At user side, according to the data qualification of cable TV network transmission or the division of user gradation, local oscillation circuit in the demodulated data signal device is designed to fixed frequency type or variable local frequency type, to fixed frequency type local oscillation circuit, then this demodulated data signal device can only be fixed one of data-signal that receives a plurality of single channel data sheet radio frequency carrier frequency, to the local oscillation circuit of variable local frequency type, then can carry out selective reception to the data-signal of a plurality of single channel data sheet radio frequency carrier frequency.
When defeated big or information classification is thin for need information transmitted amount, front end signal can adopt multichannel data injection carrier frequency mode frequently, be that multichannel data uses same radio frequency carrier frequency, signal bandwidth after the modulation is in 8MHz, the radio-frequency (RF) data signal that has the multichannel data signal is sent into the TV RF emitter, after its amplification, transmit through the cable TV transmission network network;
At user side, radio-frequency (RF) data signal to multichannel data injection frequency carrier frequency mode, local oscillation circuit in its demodulated data signal device can adopt the fixed frequency type, radio frequency carrier frequency corresponding to multichannel data, the selection of multichannel data is realized by frequency discrimination and data demodulator, if the data demodulator of multichannel is housed, then can carry out demodulation to multichannel data, export data decode to again and signal processor is handled further, if only the single channel data demodulator is installed, then only can carry out demodulation to specific one tunnel in the multichannel data.
In the data of transmission, also can in multichannel data, increase address date and control data, just can carry out addressing control, so that transmit the information of personalized address and enhancing to the control ability of user's set to the demodulated data signal device of user side.
Embodiment: below in conjunction with Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, embodiments of the invention are described, so that more clear to the understanding of inventive concept.
The data sending terminal that Figure 3 shows that embodiment 1 constitutes block diagram.
Referring to Fig. 3.Among the embodiment 1, data sending terminal adopts single channel data sheet radio frequency carrier frequency mode to modulate, the data that are the k road are corresponding to k single-channel RF carrier frequency, finish the modulation of multichannel by k data-signal modulator, send into each input port of TV RF emitter more respectively.
Data signal modulation device (1) 31 to data signal modulation device (k) 32 is made of two parts respectively, is example with data signal modulation device (1) 31:
FSK modulator 311: its role is to the coded data signal 1 of input is carried out frequency shift keying modulation (FSK), the high level that is data is corresponding to audio frequency fh, the low level of data is corresponding to audio frequency f1, and the fsk data signal after the modulation exports radio-frequency modulator 312 to;
Radio-frequency modulator 312: its role is to the fsk data signal of input is carried out frequency modulation(FM) to the radio frequency carrier frequency, the radio frequency FM signal of having modulated the fsk data signal is transported to TV RF device 33, amplify the back transmission.
Data signal modulation device (k) 32 is identical with data signal modulation device (1) 31 formation, and finishes same function, and the carrier frequency frequency difference of radio-frequency (RF) data signal is only arranged.
During work, coded data signal 1 inputs to corresponding data signal modulation device (1) 31 respectively to data signal modulation device (k) 32 to coded data signal k, these data are after finishing same FSK modulation, modulate by different radio frequency carrier frequency frequencies respectively again, different radio frequency carrier frequency frequencies is by the crystal oscillation generation frequently of different points, and the radio-frequency (RF) data signal after the modulation is sent into TV RF emitter 33 respectively and amplified the back transmission.
When carrying out the FSK modulation, the frequency of 1 couple of FSK of present embodiment is compiled and is defined as ± 4.5kHz, then signal single channel bandwidth is 9kHz, and in the 8MHz scope on certain idle channels in television channel, arrange k radio frequency carrier frequency frequency (k≤320) at interval with 25kHz, therefore, the signal spectrum of present embodiment 1 as shown in Figure 4.
In Fig. 4, the interval of F11 and F1h, Fk1 and Fkh is 9kHz, and F1 and F2, F (k-1) they are 25kHz with the frequency interval of Fk, and all in the frequency range of 8MHz.
Fig. 5 is the formation block diagram of the demodulated data signal device of embodiment 1.
Referring to Fig. 5.The modulation of transmitting by the wire transmission network radio-frequency (RF) data signal of fsk data, and the cable television program signal, behind signal branch device 51, be divided into two the tunnel, one the tunnel enters the signal input part of demodulated data signal device 52, and one the tunnel then enters the radio-frequency (RF) signal input end of television receiver 53;
Enter the radio-frequency (RF) data signal of demodulated data signal device 52, finish processing such as tuning reception, demodulation of frequency discriminator by demodulated data signal device 52 after, A/V mouth through linking to each other with television receiver 53 exports television receiver 53 to, and is carried out the demonstration of data by this television receiver.
In present embodiment 1, demodulated data signal device 52 only receives the single-channel RF data, and therefore, it is by constituting as the lower part:
A high/intermediate frequency amplifier 521, its role is to road radio-frequency (RF) data signal in the spectrum data signal is carried out tuning reception, promptly only to carrying out tuning reception one of among the F1 to Fk, and carry out mixing with local oscillation signal that local oscillation circuit 523 is sent here, and after carrying out the intermediate frequency amplification, export frequency discrimination and data demodulator 522 to;
A local oscillation circuit 523 its role is to produce a corresponding fixed frequency of rf frequency with the radio-frequency (RF) data signal that receives, and needs for the mixing of height/intermediate frequency amplifier 521;
Frequency discrimination and data demodulator 522 its role is to solve the data-signal envelope from intermediate-freuqncy signal, promptly obtain the fsk data signal, again the fsk data signal are reduced to coded data signal, and export data decode and signal processor 524 to;
Data are decoded and signal processor 524, its role is to the coded data signal that frequency discrimination and data demodulator 522 are sent here is carried out suitable conversion, make it to be transformed to the character signal that can show by television receiver 53, and export television receiver 53 to through A/V signal port with television receiver 53.
As seen from Figure 5, the input of demodulated data signal device 52 links to each other with signal branch device 51, and the output of demodulated data signal device 52 links to each other with television receiver 53;
Height/intermediate frequency amplifier 521 in the demodulated data signal device 52, its radio-frequency (RF) signal input end received RF data-signal, and its local oscillation signal input links to each other with the output of local oscillation circuit 523, its output links to each other with the signal input part of frequency discrimination and data demodulator 522, the output of frequency discrimination and data demodulator 522 links to each other with data decode and signal processor 524, and the output of data decode and signal processor 524 links to each other with television receiver 53.
The course of work of demodulated data signal device 52 is as follows:
One tunnel radio-frequency (RF) data signal is carried out tuning amplification among 521 couples of F1 to Fk shown in Figure 4 of height/intermediate frequency amplifier, and after the local oscillation signal that itself and local oscillation circuit 523 are sent here carried out mixing, obtain the intermediate frequency data signal that conforms to intermediate frequency, promptly only receiving conversion the single channel data-signal, and the intermediate-freuqncy signal of correspondence delivered to frequency discrimination and data demodulator 522;
522 pairs of frequency discrimination and data demodulators be high/and intermediate-freuqncy signal that intermediate frequency amplifier 521 is sent here carries out frequency discrimination, obtain the fsk data signal, this signal is carried out the FSK demodulation, obtain the coded data signal consistent, and export this signal to data decode and signal processor 524 with transmitting terminal;
The coded data signal that 524 pairs of frequency discriminations of data decode signal processor and data demodulator 522 are sent here is handled, semaphore request according to television receiver 53 inputs that connected, with this signal transformation is the simulation character signal that can be shown by television receiver 53, and exports through its A/V that links to each other with television receiver 53 end;
The data sending terminal that Figure 6 shows that embodiment 2 constitutes schematic diagram.
Referring to Fig. 6.Among the embodiment 2, data sending terminal adopts multichannel data injection frequency carrier frequency mode to modulate, be that k circuit-switched data code signal is modulated through the FSK of different center carrier frequencies modulator (1) 651 to FSK modulator (k) 652 respectively, the output of each FSK modulator all inserts signal synthesizer 653, and to carry out signal synthetic, send into the modulation of carrying out television channel radio frequency carrier frequency in the TV signal modulator (n+1) 63 again, after the TV RF emitter exports the cable TV transmission network network to.
Data signal modulation device 65 is by constituting as the lower part:
The FSK modulator of k different center carrier frequencies, its role is to the coded data signal of this FSK modulator of input is carried out the FSK conversion with different center carrier frequencies, the shift keying modulation signal after a plurality of different center carrier frequencies conversion all exports signal synthesizer 653 to;
A signal synthesizer 653 synthesizes the fsk signal of the different center carrier frequencies of a plurality of FSK modulators output, makes it become the modulation signal that can modulate the television channel radio frequency, and exports to TV signal modulator (n+1) 63;
During work, the multichannel data code signal inputs to data signal modulation device 65, and the multichannel fsk data signal after synthesizing exports TV signal modulator (n+1) 63 to.
The multichannel data code signal inserts the FSK modulator (1) of different center carrier frequencies to (k), carry out fsk signal conversion separately, it respectively has the frequency range of oneself, and it is not overlapping, synthesize baseband modulation signal with multichannel FSK bandwidth through signal synthesizer 653, and in TV signal modulator (n+1) 63, the television channel carrier frequency of determining being carried out amplitude modulation(PAM), this am signals exports the cable TV transmission network network to after TV RF emitter 64 amplifies.
When carrying out the FSK modulation, the frequency deviation of 2 couples of FSK of present embodiment still is set at 4.5kHz, and then the one-channel signal bandwidth is 9kHz, and in the 8MHz of television channel bandwidth scope, is to arrange each FSK center carrier frequencies at interval with 25kHz, and its signal spectrum as shown in Figure 7.
Referring to Fig. 7.Interval between FSK center carrier frequencies F1 and F2, Fk-1 and Fk is 25kHz, and Fv is the radio frequency carrier frequency frequency in this television channel, and the bandwidth of all signal frequencies is in the 8MHz scope.
Fig. 8 is the formation block diagram of the demodulated data signal device of embodiment 2.
Referring to Fig. 8.The modulation of transmitting by the cable TV transmission network network radio frequency amplitude-modulated signal of multichannel fsk data signal, and cable television program signal, be divided into two tunnel, one tunnel input that enters demodulated data signal device 82 behind signal branch device 81, the one tunnel then enters the radio-frequency (RF) signal input end of television receiver 83;
The radio-frequency (RF) data signal that enters demodulated data signal device 82 is after the 82 tuning receptions of demodulated data signal device, detection demodulation etc. are handled, and the A/V mouth through linking to each other with television receiver 83 exports television receiver 83 to, and carried out the demonstration of data by this television receiver.
In present embodiment 2, demodulated data signal device 82 can receive the multichannel data of single carrier frequency, and therefore, it is by constituting as the lower part:
A local oscillation circuit 821 its role is to produce a fixed frequency corresponding with the rf frequency of received RF data-signal, need for the mixing of height/intermediate frequency amplifier 822;
A high/intermediate frequency amplifier 822, its role is to the radio frequency carrier frequency data-signal of having modulated the multichannel data signal carry out tuning amplification and with the local oscillation signal mixing, obtain the intermediate frequency data signal and send into detection demodulator 823;
A detection demodulator 823, its role is to the intermediate frequency data signal that is loaded with the multichannel data signal that height/intermediate frequency amplifier 822 is sent here is carried out the detection demodulation, obtain the fsk signal of multichannel data signal, and send into fsk demodulator (1) 824 to fsk demodulator (k) 825;
(or a plurality of) fsk demodulator (1) 824 (or and 825), its role is to the fsk data signal corresponding to this fsk demodulator centre frequency in the fsk signal of multichannel data signal is carried out demodulation, obtain its coded data signal, export data decode and signal processor 826 to through data/address bus, and whether the work of this fsk demodulator can be subjected to the control of data decode and signal processor 826;
Data are decoded and signal processor 826, its role is to the coded data signal of sending here through data/address bus is carried out conversion, make it to become the analog signal form that is adapted to television receiver 83 demonstrations, and this data decode and signal processor 826 also have the external control signal port, according to external control signal, the fsk demodulator that is connected in data/address bus is controlled, a fsk demodulator permission job is only arranged at synchronization.
From Fig. 8 as seen, the output of local oscillation circuit 821 links to each other with the local oscillator input of height/intermediate frequency amplifier 822; The output of height/intermediate frequency amplifier 822 links to each other with the input of detection demodulator 823; The output of detection demodulator 823 links to each other with the input of (or a plurality of) fsk demodulator (1) 824 (or and 825); The output of fsk demodulator (1) 824 (or and 825) links to each other with the input of data decode and signal processor 826, and its controlled input end links to each other with the control output end of data decode and signal processor 826; The output of data decode and signal processor 826 can link to each other with television receiver 83 with visual form, and has the external control signal input.
The course of work of demodulated data signal device 82 is as follows:
822 pairs of height/intermediate frequency amplifiers carry out tuning amplification through signal branch device 81 radio-frequency (RF) data signal that send here, that have the multichannel data signal, and the local oscillation signal that itself and local oscillation circuit 821 are sent here carried out mixing, obtain the intermediate frequency data signal, export detection demodulator 823 to;
The intermediate frequency data signal that 823 pairs of high/intermediate frequency amplifiers 822 of detection demodulator are sent here carries out the detection demodulation, and output has the data-signal of multichannel FSK modulation to the fsk demodulator 824 to 825 that links to each other;
Fsk demodulator (1) 824 to the operating state of fsk demodulator (k) 825 is controlled by data decode and signal processor 826, promptly at a time only there is a fsk demodulator to work, its fsk data corresponding to this fsk demodulator centre frequency carries out demodulation, and exports the digital coding that obtains to data decode and signal processor 826 through data/address bus;
Data decode and signal processor 826 if no external control signal occurs, are then specified the fsk demodulator of default work after working on power, its coded data signal that fsk demodulator is sent here is handled conversion, make it suitable with the external device (ED) that is connect.In present embodiment 2, data decode and signal processor 826 are transformed to the coded data signal of input can transmitting terminal to be shown via television receiver 83 through the coded data signal that the transmission of cable TV transmission network network comes through the analog signal of television receiver 83 video/audios (A/V) end input.
By narration, can comparatively complete understanding be arranged to thought of the present invention to two embodiment of the present invention.Though in above-mentioned two embodiment, the external equipment that links to each other with the data-signal decoder is television receiver, but obviously go back the display unit or the controlled device of other modes, only need data decode and signal processor in the data-signal decoder data-signal to be transformed to the signal form that adapts with external device (ED), in addition, also can in the coded data signal of transmitting terminal, add address data, make that at user side those demodulated data signal devices corresponding with address data can enter work.These are all without prejudice to thought of the present invention.
Claims (2)
1, a kind of in cable TV network the method for down-transmitting data, increase at least one data signal modulation device at cable TV radio-frequency transmissions end, it can carry out steering D/A conversion with the coded data signal of need transmission, and this signal is modulated in certain idle television channel on the rf frequency of determining, transmit through the cable TV transmission network network; User side at cable TV, but increase the demodulating equipment of a demodulated data signal, the data-signal that is modulated on the rf frequency is received, demodulation process, to deliver to display unit or the control device that links to each other with demodulating equipment with the corresponding data-signal of coded data signal that receives again, when it is characterized in that big or information classification is thin for need information transmitted amount, front end signal adopts multichannel data injection carrier frequency mode frequently, be that multichannel data uses same radio frequency carrier frequency, signal bandwidth after the modulation is in 8MHz, the radio-frequency (RF) data signal that has the multichannel data signal is sent into the TV RF emitter, after its amplification, transmit through the cable TV transmission network network.
2, according to claim 1 a kind of in cable TV network the method for down-transmitting data, it is characterized in that at user side, radio-frequency (RF) data signal to multichannel data injection frequency carrier frequency mode, local oscillation circuit in its demodulated data signal device adopts the fixed frequency type, radio frequency carrier frequency corresponding to multichannel data, the selection of multichannel data is realized by frequency discrimination and data demodulator, if the data demodulator of multichannel is housed, then can carry out demodulation, export data decode to again and signal processor is handled further multichannel data; If only the single channel data demodulator is installed, then only specific one tunnel in the multichannel data carried out demodulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02110320 CN1234242C (en) | 2002-04-30 | 2002-04-30 | Method of down-transmitting data in cable television network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02110320 CN1234242C (en) | 2002-04-30 | 2002-04-30 | Method of down-transmitting data in cable television network |
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| CN1455595A CN1455595A (en) | 2003-11-12 |
| CN1234242C true CN1234242C (en) | 2005-12-28 |
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| CN 02110320 Expired - Fee Related CN1234242C (en) | 2002-04-30 | 2002-04-30 | Method of down-transmitting data in cable television network |
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| CN101631205B (en) * | 2009-08-12 | 2011-07-20 | 北京中科大洋科技发展股份有限公司 | Networked and documented method for reviewing digital media programs |
| CN101651787B (en) * | 2009-08-12 | 2011-01-19 | 北京中科大洋科技发展股份有限公司 | Networking and documenting digital media program examining system |
| WO2013075338A1 (en) * | 2011-11-25 | 2013-05-30 | 华为技术有限公司 | Method for presenting custom content in set top box, and set top box |
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