CN102244819B - Digital television receiving terminal, frequency locking system based on QAM (Queued Access Method) and frequency locking method - Google Patents
Digital television receiving terminal, frequency locking system based on QAM (Queued Access Method) and frequency locking method Download PDFInfo
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Abstract
The invention provides a frequency locking system based on QAM (Queued Access Method), comprising an edge modulator IPQAM and a digital television receiving terminal, and further comprising a management server for storing a frequency point state list. The digital television receiving terminal is used for detecting signal transmission quality of frequency points corresponding to frequency locking frequency and sending a detection result to the management server according to the frequency locking frequency from the IPQAM, keeping the frequency locking frequency same when the signal transmission quality of the frequency points corresponding to the frequency locking frequency is worsen, and obtaining a new frequency locking frequency from the IPQAM when the signal transmission quality of the frequency points corresponding to the frequency locking frequency has been worsen. The management server is used for writing the received detection result in the frequency point state list. The invention further provides a digital television receiving terminal and a frequency locking method based on QAM. By means of the terminal, the system and the method disclosed by the invention, the frequency points can be automatically switched when the quality of the received signal is worsen; the frequency locking time loss is shortened; and the working efficiency is improved.
Description
Technical field
The present invention relates to Digital TV Receiving technology, particularly a kind of receiving terminal for digital television, Locking System and method based on digital modulator (Quadrature Amplitude Modulation, QAM).
Background technology
Fig. 1 is the structural representation of existing broadcasting and TV VOD system.Now, in conjunction with Fig. 1, existing broadcasting and TV VOD system is described, specific as follows:
Existing broadcasting and TV VOD system comprises receiving terminal for digital television, vod server, video stream pushing server and edge modulator (IPQAM).Receiving terminal for digital television is sent to vod server by the request message of user's order video; Vod server is sent to the request message of order video the video stream pushing server of idle program that can playing request; Video stream pushing server is by IP network, by the video push of the program of request to IPQAM; IPQAM, by the definite frequency of the receiving terminal for digital television with sending a request message, mixes (Hybrid Fiber Coaxial, HFC) net through optical fibre-coaxial cable, transmits the video of the program of asking to receiving terminal for digital television.IPQAM and receiving terminal for digital television have been realized the transmission of Frequency Locking and program video by HFC net, be the key that can receiving terminal for digital television complete VOD service.
Fig. 2 is the structural representation of existing Locking System.Now, in conjunction with Fig. 2, existing Locking System is described, specific as follows:
HFC circuit in HFC net comprises a plurality of frequencies, the just corresponding logical channel in order to Program Transport video of each frequency; Receiving terminal for digital television is after startup, and the tuner comprising by its inside, obtains the indispensable information of the frequency locking that comprises transport stream (TS) identification number (ID) and frequency locking frequency from IPQAM transmitting on HFC circuit; Receiving terminal for digital television carries out frequency locking according to the indispensable information of frequency locking, and after locking frequency, carries out the Digital TV Receiving business such as video request program, broadcast.The process of receiving terminal for digital television locking frequency is exactly the process that receiving terminal for digital television and IPQAM determine a logical channel of not used by other receiving terminal for digital television.
When logical channel that certain frequency of comprising when HFC circuit is corresponding is damaged, the signal transmission quality of this frequency worsens, and the TV signal that user obtains by receiving terminal for digital television is unsharp, and this receiving terminal for digital television needs frequency locking again.Receiving terminal for digital television is after restarting, enter frequency locking process again, from IPQAM, obtain a new frequency locking frequency, whether the signal transmission quality that detects frequency corresponding to this frequency locking frequency worsens, when not worsening, lock this frequency, and carry out Digital TV Receiving business, otherwise continue to obtain a new frequency locking frequency from IPQAM.
In sum, after the signal transmission quality of the frequency that each receiving terminal for digital television frequency locking frequency is corresponding worsens, be logical channel that frequency is corresponding damaged after, need to restart or the triggering of other external conditions under, enter frequency locking process again, to obtain preferably frequency of a signal transmission quality.Like this, different digital television receive terminal is at frequency locking or again in the process of frequency locking, owing to not knowing that whether the logical channel that untapped frequency is corresponding is damaged, need to repeatedly detect the signal transmission quality of frequency corresponding to the logical channel of having damaged, extended the time that frequency locking consumes each time, and the frequency locking again that causes of the damage of logical channel corresponding to frequency, all needing receiving terminal for digital television to restart just can defeat completely afterwards, further extend the time that frequency locking consumes, reduced operating efficiency.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of receiving terminal for digital television, this terminal frequency that can automatically switch when the signal quality deteriorates receiving, shortens the time that frequency locking consumes, and increases work efficiency.
The object of the present invention is to provide a kind of Locking System based on QAM, this system frequency that can automatically switch when the signal quality deteriorates receiving, shortens the time that frequency locking consumes, and increases work efficiency.
The object of the present invention is to provide a kind of locking method based on QAM, the method frequency that can automatically switch when the signal quality deteriorates receiving, shortens the time that frequency locking consumes, and increases work efficiency.
For achieving the above object, technical scheme of the present invention is specifically achieved in that
A Locking System based on QAM, comprises edge modulator IPQAM and receiving terminal for digital television, and this system also comprises one for preserving the management server of frequency state table; Described frequency state table is in order to record the signal transmission quality of frequency, frequency and the information whether frequency has been used;
Described receiving terminal for digital television, according to the frequency locking frequency from IPQAM, detects the signal transmission quality of frequency corresponding to frequency locking frequency, and testing result is sent to described management server; When the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, keep frequency locking frequency constant, when the signal transmission quality of frequency corresponding to frequency locking frequency has worsened, from IPQAM, obtain a new frequency locking frequency;
Described management server writes frequency state table by the testing result receiving.
Preferably, described receiving terminal for digital television is before detecting the signal transmission quality of frequency corresponding to frequency locking frequency, further:
From management server, obtain frequency state table, from frequency state table, inquire about the signal transmission quality of frequency corresponding to frequency locking frequency, and when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, detect the signal transmission quality of frequency corresponding to frequency locking frequency.
Preferably, the signal transmission quality of the frequency not being used in the frequency state table that the further detection management server of described IPQAM is preserved, is sent to described management server by testing result.
In said system, described receiving terminal for digital television comprises:
Tuner, when in input state, the frequency locking frequency that is its distribution according to IPQAM, inquire about the signal transmission quality that described frequency state table obtains frequency corresponding to frequency locking frequency, and when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, detect the signal transmission quality of frequency corresponding to frequency locking frequency, and testing result is sent to described management server;
Described tuner is according to described testing result, when the signal transmission quality of determining the frequency that described frequency locking frequency is corresponding does not worsen, keep described frequency locking frequency constant, or according to described testing result, when the signal transmission quality of determining the frequency that described frequency locking frequency is corresponding has worsened, from IPQAM, obtain a new frequency locking frequency;
Described signal accepting state is the state that described tuner carries out Digital TV Receiving business.
In said system, described receiving terminal for digital television comprises: tuner and a tuner in input state in signal accepting state;
The described tuner in input state is distributed to the frequency locking frequency of the tuner in signal accepting state according to IPQAM, inquire about the signal transmission quality that described frequency state table obtains frequency corresponding to described frequency locking frequency, and when the signal transmission quality of frequency corresponding to described frequency locking frequency does not worsen, detect the signal transmission quality of frequency corresponding to described frequency locking frequency, and testing result is sent to described management server;
The described tuner in input state is according to described testing result, when the signal transmission quality of determining the frequency that described frequency locking frequency is corresponding does not worsen, keep described frequency locking frequency constant, or according to described testing result, when the signal transmission quality of determining the frequency that described frequency locking frequency is corresponding has worsened, the tuner of triggering in signal accepting state switches to input state, from IPQAM, obtain a new frequency locking frequency, while not worsening by detecting the signal transmission quality of definite new frequency locking frequency, lock new frequency locking frequency and switch to signal accepting state.
In said system, described IPQAM comprises a state detection module;
Described state detection module, according to the frequency state table of described management server preservation, detects the signal transmission quality of the frequency not being used in described frequency state table, and testing result is sent to institute's management server.
A receiving terminal for digital television, receiving terminal for digital television, according to the frequency locking frequency from IPQAM, detects the signal transmission quality of frequency corresponding to frequency locking frequency, and testing result is sent to management server;
Receiving terminal for digital television, when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, keeps frequency locking frequency constant, when the signal transmission quality of frequency corresponding to frequency locking frequency has worsened, from IPQAM, obtains a new frequency locking frequency.
Preferably, this terminal is before detecting the signal transmission quality of frequency corresponding to frequency locking frequency, further:
From management server, obtain frequency state table, from frequency state table, inquire about the signal transmission quality of frequency corresponding to frequency locking frequency, and when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, detect the signal transmission quality of frequency corresponding to frequency locking frequency.
In above-mentioned terminal, this terminal comprises:
Tuner, when in input state, the frequency locking frequency that is its distribution according to IPQAM, inquire about the signal transmission quality that described frequency state table obtains frequency corresponding to frequency locking frequency, and when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, detect the signal transmission quality of frequency corresponding to frequency locking frequency, and testing result is sent to described management server;
Described tuner is according to described testing result, when the signal transmission quality of determining the frequency that described frequency locking frequency is corresponding does not worsen, keep described frequency locking frequency constant, or according to described testing result, when the signal transmission quality of determining the frequency that described frequency locking frequency is corresponding has worsened, from IPQAM, obtain a new frequency locking frequency;
Described input state is that described tuner carries out the state of input to frequency corresponding to described frequency locking frequency.
In above-mentioned terminal, this terminal comprises: tuner and a tuner in input state in signal accepting state;
The described tuner in input state is distributed to the frequency locking frequency of the tuner in signal accepting state according to IPQAM, inquire about the signal transmission quality that described frequency state table obtains frequency corresponding to described frequency locking frequency, and when the signal transmission quality of frequency corresponding to described frequency locking frequency does not worsen, detect the signal transmission quality of frequency corresponding to described frequency locking frequency, and testing result is sent to described management server;
The described tuner in input state is according to described testing result, when the signal transmission quality of determining the frequency that described frequency locking frequency is corresponding does not worsen, keep frequency locking frequency constant, or according to described testing result, when the signal transmission quality of determining the frequency that described frequency locking frequency is corresponding has worsened, the tuner of triggering in signal accepting state switches to input state, from IPQAM, obtain a new frequency locking frequency, while determining that by detecting new frequency locking frequency signal transmission quality does not worsen, lock new frequency locking frequency and switch to signal accepting state;
Described input state is that described tuner carries out the state of input to frequency corresponding to described frequency locking frequency, and described signal accepting state is the state that described tuner carries out digital television business reception by frequency corresponding to described frequency locking frequency.
A locking method based on QAM, the method comprises:
A, receiving terminal for digital television, according to the frequency locking frequency from IPQAM, detect the signal transmission quality of frequency corresponding to frequency locking frequency, and testing result are write to frequency state table by management server;
B, receiving terminal for digital television judge according to testing result whether the signal transmission quality of the frequency that frequency locking frequency is corresponding worsens, if worsened, from IPQAM, obtain a new frequency locking frequency, and perform step A, if do not worsened, perform step C;
C, receiving terminal for digital television keep frequency locking frequency constant;
Described frequency state table is in order to record the signal transmission quality of frequency, frequency and the information whether frequency has been used.
Preferably, before detecting the signal transmission quality of frequency corresponding to frequency locking frequency described in steps A, further comprise:
Receiving terminal for digital television obtains frequency state table from management server, inquire about the signal transmission quality that described frequency state table obtains frequency corresponding to frequency locking frequency, and when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, detect the signal transmission quality of frequency corresponding to frequency locking frequency.
Preferably, before described steps A or after described step C, further comprise:
IPQAM detects the signal transmission quality of the frequency not being used in frequency state table, and testing result is sent to management server.
In said method, the signal transmission quality that detects frequency corresponding to frequency locking frequency described in steps A is: according to the default cycle, periodically detect the signal transmission quality of frequency corresponding to frequency locking frequency.
In said method, receiving terminal for digital television writes frequency state table by testing result by management server and comprises described in steps A:
A1, receiving terminal for digital television are sent to management server by testing result;
A2, management server write the testing result receiving the frequency state table of its preservation.
As seen from the above technical solutions, the invention provides a kind of receiving terminal for digital television, the Locking System based on QAM and locking method, receiving terminal for digital television detects the signal transmission quality of frequency corresponding to frequency locking frequency, and in the situation that signal transmission quality worsens, from IPQAM, obtain a new frequency locking frequency.Adopt terminal of the present invention, method and system, the frequency that can automatically switch when the signal quality deteriorates receiving, shortens the time that frequency locking consumes, and increases work efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing broadcasting and TV VOD system;
Fig. 2 is the structural representation of existing Locking System;
Fig. 3 is the structural representation that the present invention is based on the Locking System of QAM;
Fig. 4 is the structural representation of receiving terminal for digital television embodiment mono-of the present invention;
Fig. 5 is the structural representation of receiving terminal for digital television embodiment bis-of the present invention;
Fig. 6 is the flow chart that the present invention is based on the locking method of QAM.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
In a kind of Locking System and locking method based on QAM provided by the invention, the receiving terminal for digital television comprising in Locking System based on QAM not only can carry out existing video request program, broadcast waits Digital TV Receiving business, and can periodically detect the signal transmission quality from frequency corresponding to the frequency locking frequency of IPQAM, and when signal transmission quality occurs to worsen, again from IPQAM, obtain a frequency that signal transmission quality is good, to receive the program of program request and to realize preferably result of broadcast, realize automatic switchover frequency, shortened again the spent time of frequency locking, for fear of the spent time when the frequency that detection signal transmission quality has worsened repeatedly of all the other receiving terminal for digital television in broadcasting and TV VOD system, receiving terminal for digital television is after the testing result of signal transmission quality that obtains frequency, the signal transmission quality of frequency is write in frequency state table by management server, so that all the other receiving terminal for digital television can be when detecting the signal transmission quality of frequency, avoid the frequency that detection signal transmission quality has worsened repeatedly, further shorten the spent time of frequency locking.
Fig. 3 is the structural representation that the present invention is based on the Locking System of QAM.Now, in conjunction with Fig. 3, to the present invention is based on the Locking System of QAM, describe, specific as follows:
The Locking System that the present invention is based on QAM comprises: management server 30, receiving terminal for digital television 31 and edge modulator (IPQAM) 32.
Table one is the schematic diagram of the frequency state table of management server 30 preservations, what in signal transmission quality one hurdle in table one, mark is, the signal transmission quality that represents this frequency does not worsen, and what in table one, in signal transmission quality one hurdle, mark is no, represents that the signal transmission quality of this frequency worsens.
| IPQAM call number | Frequency (MHz) | Whether be used | Signal transmission quality is good |
| 1 | 880 | Be | Be |
| 1 | 900 | No | No |
| 1 | 920 | Be | Be |
| 2 | 940 | No | Be |
| 2 | 960 | No | Be |
Table one
Receiving terminal for digital television 31 is according to the frequency locking frequency from IPQAM32, detect the signal transmission quality of frequency corresponding to frequency locking frequency, and testing result is sent to management server 30, and when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, keep frequency locking frequency constant, when the signal transmission quality of frequency corresponding to frequency locking frequency has worsened, from IPQAM32, obtain a new frequency locking frequency, and the signal transmission quality of frequency corresponding to new frequency locking frequency is detected.Particularly, receiving terminal for digital television 31 is when detecting the signal transmission quality of frequency corresponding to frequency locking frequency, can be according to the default cycle, periodically detect the signal transmission quality of frequency, so that when logical channel corresponding to frequency is damaged, switch in time frequency, to complete better Digital TV Receiving business; Receiving terminal for digital television 31 can be undertaken by HFC net and management server 30 alternately.
Preferably, receiving terminal for digital television 31 is before detecting the signal transmission quality of frequency corresponding to frequency locking frequency, the frequency locking frequency that can further distribute according to IPQAM32, from management server 30, obtain the signal transmission quality of frequency corresponding to frequency locking frequency frequency state tables, whether the signal transmission quality that obtains frequency corresponding to this frequency locking frequency from frequency state table worsens, if worsened, no longer detect the signal transmission quality of frequency corresponding to this frequency locking frequency, from IPQAM32, obtain a new frequency locking frequency, if do not worsened, can keep this frequency locking frequency constant or further the signal transmission quality of frequency corresponding to this frequency locking frequency is detected.
Wherein, receiving terminal for digital television 31 is obtaining frequency state table from management server 30, when the signal transmission quality of the frequency that acquisition frequency locking frequency is corresponding does not worsen, default value when preventing that the record of the signal transmission quality of frequency from being initialization, can further to the signal transmission quality of frequency corresponding to this frequency locking frequency, detect, under the state of guaranteeing not worsen at signal transmission quality, carry out Digital TV Receiving business.
IPQAM32 of the present invention is not only used to receiving terminal for digital television 31 that the passage of a receiving digital television program is provided, but also can detect the signal transmission quality of receiving terminal for digital television 31 untapped frequencies, testing result is sent to management server 30, so that management server 30 upgrades the frequency state table of its preservation according to the testing result receiving.IPQAM32 of the present invention can be undertaken by IP network and management server 30 alternately.
Wherein, IPQAM32 of the present invention can, on the basis of existing IPQAM, increase by one and carry out mutual state detection module (not shown in Fig. 3) with management server 30.State detection module is according to the frequency state table obtaining from management server 30, obtain the frequency of receiving terminal for digital television 31 uses that do not comprised by broadcasting and TV VOD system, detect the signal transmission quality of frequency, and testing result is sent to management server 30, for receiving terminal for digital television 31, according to the frequency state table after upgrading in management server 30, obtain the signal transmission quality situation of nearest frequency.
Receiving terminal for digital television detects the signal transmission quality of frequency corresponding to frequency locking frequency by its tuner, or carries out the reception of digital television business.It is pointed out that the tuner of receiving terminal for digital television or in input state, or receive final state in signal, these two states are not coexisting.Tuner is when input state, and the frequency corresponding to frequency locking frequency carries out input; Tuner is when signal accepting state, and the frequency corresponding to frequency locking frequency carries out digital television business reception.
Fig. 4 is the structural representation of receiving terminal for digital television embodiment mono-of the present invention.Now, in conjunction with Fig. 4, the embodiment mono-of receiving terminal for digital television of the present invention is described, specific as follows:
Receiving terminal for digital television 31 in embodiment mono-comprises tuner 311, signal processing module 312 and audio frequency and video output module 313.
At receiving terminal for digital television 31 during in broadcast state, logical channel corresponding to frequency that tuner 311 distributes from IPQAM32, receive the program video of request, the signal of this program video is after tuner 311 down conversion process, export signal processing module 312 to, signal processing module 312 can carry out descrambling, demultiplexing and decoding to the received signal to be processed, the audio/video flow that acquisition can be play, by audio frequency and video output module 313, export corresponding playing device to.
The tuner 311 that receiving terminal for digital television 31 of the present invention comprises, when input state, is not used further to wait for to receive the program data that IPQAM32 transmits, and the signal transmission quality of frequency corresponding to the frequency locking frequency of distributing for detection of IPQAM32.
Particularly, tuner 311, when input state, is its frequency locking frequency of having distributed according to IPQAM32, detects the signal transmission quality of frequency corresponding to frequency locking frequency, and testing result is sent to management server 30; Tuner 311 is according to testing result, when the signal transmission quality of determining the frequency that frequency locking frequency is corresponding does not worsen, keep frequency locking frequency constant, or according to testing result, when the signal transmission quality of determining the frequency that frequency locking frequency is corresponding has worsened, from IPQAM32, obtain a new frequency locking frequency.Particularly, tuner 311 can be according to the default cycle, periodically detect the signal transmission quality of frequency corresponding to frequency locking frequency, and when the signal transmission quality of frequency corresponding to this frequency locking frequency worsens, the testing result of the signal transmission quality of transmission frequency and the information relevant with this frequency are sent to management server 30, so that management server 30 upgrades frequency state table, tuner 311 is asked a new frequency locking frequency again from IPQAM32, so that when tuner 311 switches to signal accepting state from input state, can use a good frequency of signal transmission quality to receive the program data of request.
In addition, tuner 311 is when input state, also can be directly and management server 30 carry out alternately, from management server 30, obtain the signal transmission quality of frequency corresponding to frequency locking frequency frequency state tables, and when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, detect again the signal transmission quality of frequency corresponding to frequency locking frequency, can avoid the detection of the frequency that 311 pairs of signal transmission qualities of tuner have worsened, shorten the spent time of frequency locking.
At tuner 311, during in input state, other module that receiving terminal for digital television 31 comprises, in holding state, no longer repeats other module at this.
Fig. 5 is the structural representation of receiving terminal for digital television embodiment bis-of the present invention.Now, in conjunction with Fig. 5, the embodiment bis-of receiving terminal for digital television of the present invention is described, specific as follows:
The receiving terminal for digital television 31 of embodiment bis-comprises: the first tuner 314, the second tuner 315, signal processing module 312 and audio frequency and video output module 313.Wherein, the first tuner 314 and the second tuner 315 are alternately in signal accepting state, and the program data signal after the output of the tuner in signal accepting state processing is to signal processing module 312; The 26S Proteasome Structure and Function of signal processing module 312 and audio frequency and video output module 313 is identical with the corresponding module in embodiment mono-, does not repeat them here.
Now only with the first tuner 314 in signal accepting state, the second tuner 315 is example in input state, and embodiment bis-is described; The second tuner 315 is in signal accepting state, and the basic principle of the first embodiment of tuner 314 in input state is identical with embodiment bis-, does not repeat them here.
The first tuner 314 is according to the frequency locking frequency from IPQAM32, and locking frequency is also carried out Digital TV Receiving business.Digital TV Receiving business of the present invention, receives the program video of asking from frequency locking frequency.
The frequency that the second tuner 315 locks according to the first tuner 314, detects the signal transmission quality of frequency corresponding to frequency locking frequency, and testing result is sent to management server 30; The second tuner 315 is according to testing result, when the signal transmission quality of determining the frequency that frequency locking frequency is corresponding does not worsen, keep frequency locking frequency constant, or according to testing result, when the signal transmission quality of determining the frequency that frequency locking frequency is corresponding has worsened, trigger the first tuner 314 and switch to input state, from IPQAM32, obtain a new frequency locking frequency, while not worsening by detecting the signal transmission quality of definite new frequency locking frequency, lock new frequency locking frequency and switch to signal accepting state.
Particularly, the second tuner 315 is when the signal transmission quality of frequency corresponding to the frequency locking frequency that the first tuner 314 lockings in signal accepting state detected has worsened, from input state, switch to signal accepting state, from IPQAM32, obtain a new frequency locking frequency that signal transmission quality is good, carry out Digital TV Receiving business, simultaneously, trigger the first tuner 314 and switch to input state from signal accepting state, so that the first tuner 314 continues to detect the signal transmission quality of frequency corresponding to the new frequency locking frequency of now the second tuner 315 lockings in signal accepting state.
Preferably, the second tuner 315 can be before the signal transmission quality of frequency corresponding to the frequency locking frequency that detects the first tuner 314 lockings in signal accepting state, further from management server 30, obtain the signal transmission quality of frequency corresponding to this frequency locking frequency frequency state tables, and when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, detect again the signal transmission quality of frequency corresponding to this frequency locking frequency, avoid the detection of frequency that signal transmission quality has been worsened, shortened the spent time of frequency locking.
Fig. 6 is the flow chart that the present invention is based on the locking method of QAM.Now, in conjunction with Fig. 6, to the present invention is based on the locking method of QAM, describe, specific as follows:
Step 601: receiving terminal for digital television detects the signal transmission quality of frequency corresponding to frequency locking frequency, and testing result is write to frequency state table by management server;
Receiving terminal for digital television 31 can be according to the default cycle, periodically detects the signal transmission quality that IPQAM32 distributes to frequency corresponding to the frequency locking frequency of this receiving terminal for digital television 31; Concrete detection method can adopt conventional signal quality detection method, does not repeat them here.
In this step, receiving terminal for digital television 31 is by management server 30, testing result is write to the concrete grammar of frequency state table, can send testing result to management server 30 for receiving terminal for digital television 31, management server 30 writes result the frequency state table of its preservation, or the frequency state table of directly management server 30 being preserved for receiving terminal for digital television 31 carries out read or write operation.Consider that receiving terminal for digital television 31 is except Digital TV Receiving business, also the signal transmission quality of frequency is detected, mutual by with management server 30 of the receiving terminal for digital television 31 of embodiment of the method for the present invention, by management server 30, indirectly from frequency state table, obtain the signal transmission quality of frequency.
Frequency state table can be stored in management server 30, or other can carry out in mutual equipment with receiving terminal for digital television 31.
Step 602: receiving terminal for digital television judges whether signal transmission quality worsens, and if so, performs step 603, otherwise performs step 604;
Receiving terminal for digital television 31 is according to the testing result in step 601, judges whether the signal transmission quality of the frequency that frequency locking frequency that IPQAM32 distributed for this receiving terminal for digital television 31 is corresponding worsens.
Step 603: receiving terminal for digital television obtains a new frequency locking frequency from IPQAM, performs step afterwards 601;
Receiving terminal for digital television 31 when the signal transmission quality of determining the frequency that frequency locking frequency that IPQAM32 has distributed for this receiving terminal for digital television 31 is corresponding has worsened, by with IPQAM32 alternately, obtain a new frequency locking frequency.
Step 604: receiving terminal for digital television keeps frequency locking frequency constant;
Receiving terminal for digital television 31 is not when the signal transmission quality of determining the frequency that frequency locking frequency that IPQAM32 has distributed for this receiving terminal for digital television 31 is corresponding worsens, and the frequency locking frequency that maintenance has distributed is constant.
Step 605: finish.
Preferably, before step 601 or after step 604, further comprise: IPQAM32 detects the signal transmission quality of the frequency not being used in frequency state table, testing result is sent to management server 30, so that management server 30 upgrades the frequency state table of its preservation according to the testing result receiving.
Preferably, in step 602, receiving terminal for digital television 32 can further obtain frequency state table from management server 30, according to the signal transmission quality of the frequency in frequency state table, judge, if worsen, perform step 603, otherwise, can further detect the signal quality of frequency corresponding to frequency locking frequency, according to testing result, judge whether the signal transmission quality of the frequency that frequency locking frequency is now corresponding worsens.
In above-mentioned preferred embodiment of the present invention, receiving terminal for digital television periodically detects IPQAM for the signal transmission quality of frequency corresponding to the frequency locking frequency of its distribution or directly from a frequency state table, inquires about the signal transmission quality of frequency, and when signal transmission quality worsens, from trend IPQAM request, for it, distribute a new frequency locking frequency, to avoid restarting, enter frequency locking process again, shortened the spent time of frequency locking; Simultaneously, receiving terminal for digital television is in carrying out the process of frequency locking, if the result that the frequency state table picked up signal transmission quality that inquiry obtains from management server has worsened, without the frequency that detection signal transmission quality has worsened again, further shortens the spent time of frequency locking.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
1. the Locking System based on QAM, comprises edge modulator IPQAM and receiving terminal for digital television, it is characterized in that, this system also comprises one for preserving the management server of frequency state table; Described frequency state table is in order to record the signal transmission quality of frequency, frequency and the information whether frequency has been used;
Described receiving terminal for digital television is according to the frequency locking frequency from IPQAM, from management server, obtain frequency state table, from frequency state table, inquire about the signal transmission quality of frequency corresponding to frequency locking frequency, and when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, detect the signal transmission quality of frequency corresponding to frequency locking frequency, and testing result is sent to described management server; When the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, keep frequency locking frequency constant, when the signal transmission quality of frequency corresponding to frequency locking frequency has worsened, from IPQAM, obtain a new frequency locking frequency;
Described management server writes frequency state table by the testing result receiving;
Described receiving terminal for digital television comprises:
Tuner, when in input state, the frequency locking frequency that is its distribution according to IPQAM, inquire about the signal transmission quality that described frequency state table obtains frequency corresponding to frequency locking frequency, and when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, detect the signal transmission quality of frequency corresponding to frequency locking frequency, and testing result is sent to described management server;
Described tuner is according to described testing result, when the signal transmission quality of determining the frequency that described frequency locking frequency is corresponding does not worsen, keep described frequency locking frequency constant, or according to described testing result, when the signal transmission quality of determining the frequency that described frequency locking frequency is corresponding has worsened, from IPQAM, obtain a new frequency locking frequency;
Described input state is that described tuner carries out the state of input to frequency corresponding to described frequency locking frequency.
2. system according to claim 1, is characterized in that, the signal transmission quality of the frequency not being used in the frequency state table that the further detection management server of described IPQAM is preserved, is sent to described management server by testing result.
3. system according to claim 2, is characterized in that, described IPQAM comprises a state detection module;
Described state detection module, according to the frequency state table of described management server preservation, detects the signal transmission quality of the frequency not being used in described frequency state table, and testing result is sent to institute's management server.
4. the Locking System based on QAM, comprises edge modulator IPQAM and receiving terminal for digital television, it is characterized in that, this system also comprises one for preserving the management server of frequency state table; Described frequency state table is in order to record the signal transmission quality of frequency, frequency and the information whether frequency has been used;
Described receiving terminal for digital television is according to the frequency locking frequency from IPQAM, from management server, obtain frequency state table, from frequency state table, inquire about the signal transmission quality of frequency corresponding to frequency locking frequency, and when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, detect the signal transmission quality of frequency corresponding to frequency locking frequency, and testing result is sent to described management server; When the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, keep frequency locking frequency constant, when the signal transmission quality of frequency corresponding to frequency locking frequency has worsened, from IPQAM, obtain a new frequency locking frequency;
Described management server writes frequency state table by the testing result receiving;
Described receiving terminal for digital television comprises: tuner and a tuner in input state in signal accepting state;
The described tuner in input state is distributed to the frequency locking frequency of the tuner in signal accepting state according to IPQAM, inquire about the signal transmission quality that described frequency state table obtains frequency corresponding to described frequency locking frequency, and when the signal transmission quality of frequency corresponding to described frequency locking frequency does not worsen, detect the signal transmission quality of frequency corresponding to described frequency locking frequency, and testing result is sent to described management server;
The described tuner in input state is according to described testing result, when the signal transmission quality of determining the frequency that described frequency locking frequency is corresponding does not worsen, keep described frequency locking frequency constant, or according to described testing result, when the signal transmission quality of determining the frequency that described frequency locking frequency is corresponding has worsened, the tuner of triggering in signal accepting state switches to input state, from IPQAM, obtain a new frequency locking frequency, while not worsening by detecting the signal transmission quality of definite new frequency locking frequency, lock new frequency locking frequency and switch to signal accepting state,
Described input state is that described tuner carries out the state of input to frequency corresponding to described frequency locking frequency, and described signal accepting state is the state that described tuner carries out digital television business reception by frequency corresponding to described frequency locking frequency.
5. system according to claim 4, is characterized in that, the signal transmission quality of the frequency not being used in the frequency state table that the further detection management server of described IPQAM is preserved, is sent to described management server by testing result.
6. system according to claim 5, is characterized in that, described IPQAM comprises a state detection module;
Described state detection module, according to the frequency state table of described management server preservation, detects the signal transmission quality of the frequency not being used in described frequency state table, and testing result is sent to institute's management server.
7. a receiving terminal for digital television, is characterized in that,
Tuner in receiving terminal for digital television is according to the frequency locking frequency from IPQAM, from management server, obtain frequency state table, from frequency state table, inquire about the signal transmission quality of frequency corresponding to frequency locking frequency, and when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, detect the signal transmission quality of frequency corresponding to frequency locking frequency, and testing result is sent to management server;
Tuner in receiving terminal for digital television, when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, keeps frequency locking frequency constant, when the signal transmission quality of frequency corresponding to frequency locking frequency has worsened, from IPQAM, obtains a new frequency locking frequency;
This terminal comprises:
Tuner, when in input state, the frequency locking frequency that is its distribution according to IPQAM, inquire about the signal transmission quality that described frequency state table obtains frequency corresponding to frequency locking frequency, and when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, detect the signal transmission quality of frequency corresponding to frequency locking frequency, and testing result is sent to described management server;
Described tuner is according to described testing result, when the signal transmission quality of determining the frequency that described frequency locking frequency is corresponding does not worsen, keep described frequency locking frequency constant, or according to described testing result, when the signal transmission quality of determining the frequency that described frequency locking frequency is corresponding has worsened, from IPQAM, obtain a new frequency locking frequency;
Described input state is that described tuner carries out the state of input to frequency corresponding to described frequency locking frequency.
8. a receiving terminal for digital television, is characterized in that,
Tuner in receiving terminal for digital television is according to the frequency locking frequency from IPQAM, from management server, obtain frequency state table, from frequency state table, inquire about the signal transmission quality of frequency corresponding to frequency locking frequency, and when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, detect the signal transmission quality of frequency corresponding to frequency locking frequency, and testing result is sent to management server;
Tuner in receiving terminal for digital television, when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, keeps frequency locking frequency constant, when the signal transmission quality of frequency corresponding to frequency locking frequency has worsened, from IPQAM, obtains a new frequency locking frequency;
This terminal comprises: tuner and a tuner in input state in signal accepting state;
The described tuner in input state is distributed to the frequency locking frequency of the tuner in signal accepting state according to IPQAM, inquire about the signal transmission quality that described frequency state table obtains frequency corresponding to described frequency locking frequency, and when the signal transmission quality of frequency corresponding to described frequency locking frequency does not worsen, detect the signal transmission quality of frequency corresponding to described frequency locking frequency, and testing result is sent to described management server;
The described tuner in input state is according to described testing result, when the signal transmission quality of determining the frequency that described frequency locking frequency is corresponding does not worsen, keep frequency locking frequency constant, or according to described testing result, when the signal transmission quality of determining the frequency that described frequency locking frequency is corresponding has worsened, the tuner of triggering in signal accepting state switches to input state, from IPQAM, obtain a new frequency locking frequency, while determining that by detecting new frequency locking frequency signal transmission quality does not worsen, lock new frequency locking frequency and switch to signal accepting state;
Described input state is that described tuner carries out the state of input to frequency corresponding to described frequency locking frequency, and described signal accepting state is the state that described tuner carries out digital television business reception by frequency corresponding to described frequency locking frequency.
9. the locking method based on QAM, is characterized in that, the method comprises:
Tuner in A, receiving terminal for digital television is when in input state, according to the frequency locking frequency from IPQAM, from management server, obtain frequency state table, inquire about the signal transmission quality that described frequency state table obtains frequency corresponding to frequency locking frequency, and when the signal transmission quality of frequency corresponding to frequency locking frequency does not worsen, detect the signal transmission quality of frequency corresponding to frequency locking frequency, and testing result is write to frequency state table by management server;
Tuner in B, receiving terminal for digital television judges according to testing result whether the signal transmission quality of the frequency that frequency locking frequency is corresponding worsens, if worsened, from IPQAM, obtain a new frequency locking frequency, and perform step A, if do not worsen, perform step C;
Tuner in C, receiving terminal for digital television keeps frequency locking frequency constant;
Described frequency state table is in order to record the signal transmission quality of frequency, frequency and the information whether frequency has been used;
Described input state is that described tuner carries out the state of input to frequency corresponding to described frequency locking frequency.
10. method according to claim 9, is characterized in that, before described steps A or after described step C, further comprises:
IPQAM detects the signal transmission quality of the frequency not being used in frequency state table, and testing result is sent to management server.
11. methods according to claim 9, is characterized in that, the signal transmission quality that detects frequency corresponding to frequency locking frequency described in steps A is: according to the default cycle, periodically detect the signal transmission quality of frequency corresponding to frequency locking frequency.
12. methods according to claim 9, is characterized in that, receiving terminal for digital television writes frequency state table by testing result by management server and comprises described in steps A:
A1, receiving terminal for digital television are sent to management server by testing result;
A2, management server write the testing result receiving the frequency state table of its preservation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110189196.XA CN102244819B (en) | 2011-07-01 | 2011-07-01 | Digital television receiving terminal, frequency locking system based on QAM (Queued Access Method) and frequency locking method |
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| CN201110189196.XA CN102244819B (en) | 2011-07-01 | 2011-07-01 | Digital television receiving terminal, frequency locking system based on QAM (Queued Access Method) and frequency locking method |
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| CN103139645A (en) * | 2011-11-23 | 2013-06-05 | 康佳集团股份有限公司 | Method and set top box for controlling programs |
| CN102572553B (en) * | 2012-01-09 | 2016-01-20 | 深圳创维数字技术有限公司 | A kind of method, system and relevant device processing two-way services |
| CN103297813A (en) * | 2013-05-14 | 2013-09-11 | 深圳市爱渡飞科技有限公司 | Video-on-demand method, video-on-demand system and video-on-demand server |
| CN107396174B (en) * | 2017-05-31 | 2022-04-12 | 海信视像科技股份有限公司 | Code stream demodulation method and television |
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| US20040125239A1 (en) * | 2002-12-26 | 2004-07-01 | David Rahn | Television tuner supporting channel hopping |
| CN100512241C (en) * | 2006-04-25 | 2009-07-08 | 深圳市同洲电子股份有限公司 | Gateway based on real-time flow host-host protocol |
| CN101170799B (en) * | 2006-10-27 | 2012-03-21 | 北京信威通信技术股份有限公司 | A method for TDD system terminal to switch between different frequent points |
| CN102026035B (en) * | 2009-09-10 | 2012-07-11 | 华为技术有限公司 | Method for allocating signal routing resources in video on-demand service, terminal and server |
| CN101873540A (en) * | 2010-06-10 | 2010-10-27 | 东莞市泰斗微电子科技有限公司 | Method for switching mobile multimedia broadcasting services and corresponding receiving device |
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