CN100574366C - Channel-changing method in the digital cable set-top box - Google Patents
Channel-changing method in the digital cable set-top box Download PDFInfo
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- CN100574366C CN100574366C CNB2005100302233A CN200510030223A CN100574366C CN 100574366 C CN100574366 C CN 100574366C CN B2005100302233 A CNB2005100302233 A CN B2005100302233A CN 200510030223 A CN200510030223 A CN 200510030223A CN 100574366 C CN100574366 C CN 100574366C
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Abstract
The invention relates to the channel-changing method in the digital cable broadcasting receiver of open cable mode.The present invention has following characteristics.During channel switch, in the SVCT of correlated channels, only resolve a PAT/PMT who is complementary with the program number of narrating (program_number), the channel information that extracts among programme information that extracts and the SVCT is as the basis, the program of correlated channels is adjusted and decoded, and show above-mentioned information.So, when the channel switch, channel switching time is reached minimize even carry out the physical channel conversion according to the present invention.In addition, when channel switch, carry out the physical channel conversion or do not carry out conversion, because only resolve a PAT/PMT, so no matter use any channel to change, its channel switching time is almost similar.
Description
[technical field]
The invention relates to the digital cable broadcasting receiver, particularly based on the channel-changing method in the top box of digital machine (Open Cable Set Top Box) of opening cable.
[background technology]
Our country to be opening cable mode as domestic digital cable broadcast standard, and what above-mentioned open cable mode was used is, with the Doby-AC3 of audio compression mode and the MPEG-2 of video mode.In addition, for the broadcasted content of high added value,, begin just to separate from digital cable set-top box in order to prevent pirate and to disturb and collocation point (Point Of Deployment the is called for short POD) module of employing; In addition, security system provides easy to operate function, and equipment also has retail simultaneously, so the digital cable broadcasting receiver also has advantages of being cheap.That is comprising of, existing in the cable set-top box limits receiving system (Conditional Access; Abbreviation CA) POD module begins to separate from set-top box; Standard interface (I/F) between definition set-top box and the POD module, if meet POD I/F, anyone can the maker top box.So the consumer can directly buy above-mentioned set-top box, cable system operators (system operator as buying VCR; SO) if provide user POD module to the user, the user uses above-mentioned POD module and cable set-top box, can receive various cablecasts.
In addition, above-mentioned open cable mode is served for two-way (upwards, downwards) is provided, and uses necessary upper limit bandwidth 5-42MHz, and the channel width amplitude of (In Band) lower limit is and national channel environment facies 6MHz together in the band.In addition, channel and broadcast program recommended information use outer (the Out Of Band of band; Be called for short OOB, promptly frequency band is outer) the program customizing messages (Program Specific Information, abbreviation PSI) of (with the band signal transmission) in system information (System Information is called for short SI) and the band.
Fig. 1 represents, the formation schematic diagram of the digital cable set-top box of general open cable mode.Mainly contain with lower device and form cable set-top box 100 and the POD module 200 of separating.
Above-mentioned cable set-top box device 100 is connected with the cable top device of a kind of broadcasting office of the program of watching digital cable to use, by the interior band in the cable channel bandwidth, receives the A/V broadcast program; By in addition, use the top device to carry out two-way communication.
That is, by the A/V broadcast program of top device, through tuner 111 and demodulating equipment 112 adjust with demodulation after, use 200 outputs of POD modular device.
In addition, by OOB, the channel transmitted adjustment with introduce identical data message with program, put 113 by OOB biography/tipping, use the output of POD module.
The decoding of the broadcast singal that above-mentioned POD modular device 200 receives uses PCMCIA form card separate users to confirm operations such as operation.
So the CA system uses multipleization of conveyer belt (TP) processing unit 116 outputs of TV-set top box 100 under the situation that the signal after the above-mentioned demodulation is decoded in above-mentioned POD modular device 200.
Above-mentioned multipleization processing unit 116 through being separated into video and packets of audio data after the multipleization processing, uses each Video Decoder 117 and audio decoder 118, and 119 outputs of PSE resolver.Above-mentioned Video Decoder 117 is controlled house-keeping (various header information, startup sign indicating number etc.) in video packets of data, pure data message is carried out length-changeable decoding (Variable Length Decoding; Be called for short VLD) after through the quantization process, discrete cosine changes (IDCT) to be handled, again through utilizing the compensation process of operating vector, use the pixel value of original picture to restore after, export by monitor again.In addition, audio decoder 118 utilizes the AC-3 algorithm, and loud speaker output is used in packets of audio data decoding back.
In addition, utilize the set-top box of existing ground ripple or satellite, if energized at first scans behind all channels that can adjust and storage.After, if user's selective channel reads the scanning information of storage and adjusts to relevant channel.
With above-mentioned opposite, there is not channel scanning function (Channel ScanFunction) in the open cable set-top box.If user's selective channel behind the power connection, by system information (SystemInformation is called for short SI) the pseudo channel table (Virtual Channel Table is called for short VCT) that enters is carried out real time parsing, obtain the information of correlated channels, begin to adjust channel from this channel information.State in the use under the situation of VCT cable set-top box, be known as succinct form pseudo channel table (Short-form VCT is called for short SVCT), under the situation of distinguishing the ground ripple, also be known as SVCT.
That is,, can receive the most basic broadcasting, the program recommended information of channel information and each channel can be provided for the user in order to use the user even in the middle digital cable broadcasting.
Wherein PSI comprises the information of A/V (audio/video) picture that can show particular channel, transmits with broadcast program by in being with.That is, PSI is included in the information flow after the processing of multipleization of digital cable set-top box, and information specific stream is carried out multipleization processing, the information that can decode to the information after handling.In addition, SI comprises the information that can adjust channel, transmits by OOB.
At this moment, above-mentioned PSI comprises program association table (Program Association Table is called for short PAT) and program map table (Program Map Table is called for short PMT), comprises SVCT among the above-mentioned SI.
Above-mentioned PAT selects the PID of the conveyer belt packet that transmits PMT to recording and narrating the program inscape in each program designation.Above-mentioned PMT records and narrates, the pid information that conveyer belt packet pid information that the audio frequency of program identification designation and formation program, indivedual bits of video transmit and PCR transmit.
Above-mentioned SVCT defines a form in SI, as shown in Figure 2, represent the new chart organigram of SVCT bit stream that general cable uses.
As shown in Figure 2, extract the channel designation of one of them channel in a plurality of channels of pseudo channel number (Virtual_channel_number) in physical channel, CDS with reference to (CDS_reference) be above-mentioned channel designation physical channel preset channel.That is, a plurality of channels of physical channel stored, a channel has only a corresponding broadcast program.For example:, have 5 broadcast programs in the above-mentioned physical channel if there are 5 channels in the physical channel.
Program number (program_number) is represented the program designation for the channel that connects MPEG-2PAT and PMT definition, and is consistent with the program designation in the above-mentioned PAT/PMT.
MMS is a modulation intelligence with reference to (MMS_reference).That is the load mode of the broadcast program corresponding, with above-mentioned channel.Describe for example below, if under the situation of open cable mode in band, make 64QAM (Quadurature Ampl itude Modulat ion) or 256QAM mode; If under the situation of OOB, then use the QPSK transmission means.
Therefore, if resolve SVCT, can know information such as number of physical channels, the channel frequency that conforms to above-mentioned physical channel, modulator approach.
As previously mentioned, even above-mentioned physical channel is very little more than one channel arranged also.For example: 5 channels are arranged in the physical channel, 20 channels are arranged in another physical channel.The number of channel that exists in each physical channel, each physical channel is all inequality.
The user utilizes the numerical key of remote controller, selects particular channel or also can use/following key translated channel, presets channel at every turn when channel switch taking place and also can follow conversion thereupon.According to channel switch, though channel variation physical channel may follow conversion and also might not have conversion.For example: be known as and have 101,102,103 channel in 10 the physical channel, if user's this moment selects to want to select 103 program behind 101 the program, though the program of channel from 101 is transformed into 103, physical channel 10 can not change.But, when the program of receive channel 101, think the program of selective reception 106, physical channel has been transformed into 20 from 10.
In the past, if physical channel is also changed during channel switch, the channel after existing all to resolve in the physical channel after the conversion constitutes the information of utilizing above-mentioned channel chart behind the channel chart, adjusts correlated channels.In addition, during conversion,, adjust correlated channels if not conversion of channel for above-mentioned physical channel, because the information of channel chart forms, utilizes the information of the existing channel chart of not resolving.
As mentioned above, when former channel is changed,, must confirm at first whether physical channel is changed in order to adjust the channel after the conversion.
Fig. 4 represents that according to the embodiment schematic flow sheet of channel-changing method of the present invention, this conversion method comprises following component part and step altogether.The user needs the specific program of audiovisual, if the process of translated channel is 401 steps; Channel switch engine process is 115 steps; According to channel switch, judge that the process whether physical channel is changed is 402 steps.
If judged result has been the physical channel conversion, control SI resolver 114, resolve the SVCT of all channels that exist in the above-mentioned physical channel, constituting the process of storing behind the channel chart-information is 403 steps.Above-mentioned SVCT represents, in the form that defines in the SI by above-mentioned OOB and the input of POD module one.
At this moment, the actual video/audio frequency/PCR PID in the channel is not in SI, so the channel information that the engine 115 of above-mentioned channel conversion extracts from SVCT again uses 119 outputs of PSI resolver.PSI resolver 119 is resolved and each PAT that is present in all channel matched in the related physical channel and the interior PMT of institute that defines of above-mentioned PAT based on above-mentioned channel information, uses transform engine 115 outputs.In above-mentioned channel conversion engine 115, information after resolving among the above-mentioned PAT/PMT with store in the channel chart-information after, based on the channel chart-information after the storage, control tuner 111 and multipleization processing unit 116, the process of adjusting the A/V/PCR PID of the channel that the user selects and carry out multipleization processing in 401 steps is 404 steps.
In addition, in above-mentioned 402 steps, if not conversion of physical channel when judged result is channel switch, the channel chart-information of above-mentioned physical channel has constituted in channel conversion engine 115 and storage.So deposit channel chart-information based on what not do not resolve this moment, control tuner 111 and multipleization processing unit 116, the A/V/PCR PID of the channel that the adjustment user selects in 401 steps and the process of carrying out multipleization processing are 405 steps.
[summary of the invention]
Therefore, the purpose of this invention is to provide the interior channel-changing method of a kind of digital cable broadcasting receiver.As mentioned above, also conversion thereupon of physical channel during channel switch is if under the situation of a plurality of channels, all resolve above-mentioned a plurality of channels in physical channel at this moment.So there is the shortcoming that needs the long period in the channel switch of carrying out in this case.Particularly, to existing increasing channel to carry out a large amount of time of channel switch needs in the physical channel.
In addition, when channel switch, under the situation that physical channel is not changed thereupon, owing to the channel chart-information exists, so also can change to the channel that does not have to resolve.Simultaneously, because the channel that exists in each physical channel is all inequality, so physical channel is also under the situation of conversion when channel conversion, according to the channel that exists in the physical channel, channel switching time also changes thereupon.Therefore, this conversion method can be carried out channel switch apace to the channel that has, the channel switch that has just very slowly, also exist channel switching time not have the shortcoming of consistency simultaneously.
Channel-changing method in the digital cable broadcasting receiver that the present invention researchs and develops in order to address the above problem.Main purpose is in order to provide a kind of, can carry out the method for channel switch fast in open cable set-top box.
Another object of the present invention is in order to provide a kind of, in order to make in open cable set-top box according to the channel switching time of physical channel conversion and the identical method of channel switching time that presets channel according to conversion only.
To achieve these goals, the channel-changing method according in the digital cable broadcasting receiver of the present invention mainly contains the following steps feature.
(a) if according to the conversion of user's selective channel, extract the step of channel information behind the SVCT that presets channel of parsing conversion;
(b) only resolve with above-mentioned channel information in a PAT/PMT being complementary of program designation, extract the step of programme information then;
(c) based on the channel and the programme information of said extracted, the program of the channel selected in above-mentioned (a) step is adjusted and decoded, and in the step of screen displayed.Above-mentioned steps is the principal character of the channel-changing method in the digital cable broadcasting receiver.
According to other embodiments of the invention, the channel-changing method of digital cable broadcasting receiver mainly may further comprise the steps.
(a), resolve the step of extracting the SVCT of channel behind the channel that presets of conversion if according to user's selective channel conversion;
(b) only resolve a PAT/PMT who mates with above-mentioned channel information, extract the step of programme information then;
(c) based on the channel and the programme information of said extracted, store after the formation listing information.Simultaneously,, the channel program of selecting in above-mentioned (a) is resolved and decoded based on above-mentioned listing information, and in the step of screen displayed;
(d) in the channel chart-information of in above-mentioned (c) step, storing,,, back output, the step that related-program can not be seen are resolved and adjusted to related-program in picture based on channel and the programme information in the above-mentioned channel mapping table if carry out channel switch;
(e) only resolve the PAT/PMT that is complementary with relevant program designation of presetting channel that channel chart-information from above-mentioned (d) step and storage simultaneously begins to read, the step that the programme information of judgement extraction programme information and storage is whether consistent;
(f) in above-mentioned (e) step, judged result is if two programme information unanimities, and decoded program in above-mentioned (d) step is with the step display that appears in the picture;
(g) in above-mentioned (e) step, judged result is if two programs are inconsistent, based on the programme information after resolving in above-mentioned (e) step, again the correlated channels program adjusted and decoded afterwards in the step of screen displayed.Above-mentioned steps is the principal character of the channel-changing method of digital cable broadcasting receiver.
Other purpose of the present invention, feature and advantage please refer to the detailed description of accompanying drawing embodiment, so that understand this technology better.
As mentioned above, the present invention is for a kind of channel-changing method in the digital cable broadcasting receiver is provided.During channel switch, only resolve narrate the PAT/PMT that program number (program_number) is complementary with the relevant SVCT that presets channel is interior after, based on this resolving information, to the program of correlated channels adjust with decoding processing after show.Therefore, during according to channel switch of the present invention, even the physical channel conversion also can reduce channel switching time.In addition, during channel switch, because only resolve a PAT/PMT of physical channel conversion or not conversion, its channel switching time of any channel switch much at one.
[description of drawings]
Fig. 1 represents the formation schematic diagram of the digital optical cable broadcasting receiver of general open cable mode.
Fig. 2 represents that general SVCT bit stream constitutes schematic diagram.
Fig. 3 represents general PAT bit stream organigram.
Fig. 4 represents the embodiment operating process schematic diagram of the channel-changing method in the digital cable broadcasting receiver in the past.
Fig. 5 represents the embodiment operating process schematic diagram according to the channel-changing method in the digital cable broadcasting receiver of the present invention.
[embodiment]
Embodiment to the channel-changing method in the digital cable broadcasting receiver of the present invention is elaborated below with reference to accompanying drawings.Channel-changing method in the digital cable broadcasting receiver has following characteristics.
When carrying out channel switch, whether it doesn't matter with the conversion of physical channel according to the present invention; Resolve a PAT/PMT who is complementary with relevant program designation of presetting in the channel SVCT,, correlated channels is adjusted and decoding processing based on channel chart-information and this channel chart-information that constitutes, and the feature that shows.
That is, when carrying out channel switch, needed program designation has entered the SVCT of figure, uses PSI to transmit, if only resolve a required PAT/PMT, so the parsing time of any channel when carrying out channel switch much at one.
Resolve the storage of physical channel clock memory all preset channel and respectively preset the PAT of channel and above-mentioned PAT in define PMT the time, require its required time to reduce.In addition, during channel switch, physical channel with change thereupon or do not change owing to only resolve a PAT/PMT, so the change-over time that any channel is changed is much at one.
Fig. 5 represents, according to the operation embodiment schematic flow sheet of channel-changing method of the present invention.This operating process has following step, if the program of user's specific audio-visual is changed, presetting channel conversion is the 501st step; So, channel conversion engine 115 is resolved the relevant SVCT that presets channel by SI resolver 114, and extracting the program designation then is 502 steps; Use 119 these program designations of output of PSI resolver.The PAT/PMT that the program number (program_number) of 119 parsings of above-mentioned PSI resolver and above-mentioned SVCT is complementary behind the extraction programme information, uses 115 outputs of channel switch engine apparatus.Above-mentioned channel switch engine apparatus 115, channel information that use is extracted in SI resolver 114 and the programme information that extracts from PSI resolver formation channel chart-information and the process of storing are 503 steps.
Fig. 3 represents, constitutes the schematic diagram of general PAT bit stream.Chart identifier (table_id) is made of 8 bits, the value of definition chart identifier (table_id) in ISO and ETSI.
Section_syntax_indicator can exchange in the PSI of the MPEG-2 system specification, for the length of expression relevant range is used section_length.
In addition, program introduction or information on services, the related content of rapid-result picture can only change according to the time.That is, the time of program when projection also and then changes thereupon, owing to must be introduced other programme content, must transmit new interpretive program information on services.That is,, use version number (version_number) in order to know information on services or program recommended information and other content that transmits previously.
The current just suitable interior content that next time is suitable for perhaps just of content of transmission will appear in Current_next_indicator.Regional designation appears in Section_number, and the chart that the digital cable broadcasting receiver receives utilizes regional designation can put in order more in a certain order.The designation of the final area of current chart appears in Last_section_number.
At this moment, above-mentioned PAT ' for ' uses the literary composition repeatedly in loop to use for the PID (program_map_PID) that narrates program number (program_number) and PMT.The number of occurrence (N) in above-mentioned ' for ' loop is several consistent with the interior corresponding PMT's of above-mentioned PAT.
Therefore, resolve the PAT that the program number (program_number) with above-mentioned SVCT is complementary, resolve again the PMT of the program_map_PID that is complementary with said procedure numbering (program_number) among the above-mentioned PAT, extract programme information then.
In addition, above-mentioned channel conversion engine apparatus 115, each channel information and the programme information that extract from SI resolver 114 and PSI resolver 119 have constituted the channel chart-information; In storage, based on the channel chart-information, control tuner 111 and multipleization processing unit 116; The user is in 501 steps, and the process that the A/VPCR PID of the channel selected is adjusted with multipleization processing is 504 steps.
So according to the present invention, physical channel conversion or not conversion during channel switch when use speed is much at one carried out channel switch, can be carried out channel switch fast.
Next, under the situation that the channel of user's use in above-mentioned channel chart-information changed, again resolve the relevant SVCT that presets channel, after extracting channel information and program number (program_number), in PSI device 119, only resolve a PAT/PMT who is complementary with said procedure numbering (program_number), can access required channel A/V/PCR PID.
In other embodiments, under the situation that the channel of user's use in above-mentioned channel chart-information changed, the relevant SVCT that presets channel that replacement can not be resolved, use the relevant program_nmuber that preset channel of PSI resolver output in the channel chart-information of having stored, resolve a PAT/PMT who is complementary with said procedure numbering (program_number), export programme information then.Next the value to the programme information of programme information that extracts and the channel chart-information of having stored compares.Simultaneously, utilize the channel chart-information stored, to the program of correlated channels adjust with decoding processing after, if in screen displayed, can not see above-mentioned program in the picture.That is, picture is in black state or the picture and has used AD HOC.
At this moment, in above-mentioned PSI device 119, judged result is if the new programme information that extracts of resolving is consistent with the programme information of having stored, according to the channel chart-information of having stored adjust with decoding processing after, in the program picture of demonstration, can normally see.
In addition, judged result is if two programme informations are inconsistent, based on the information of new parsing, to the program of correlated channels adjust with decoding processing after, appear in the picture displayed.Simultaneously, use the information updating and the memory channel chart-information of above-mentioned parsing.
So, A/V/PCR PID changes when actual broadcast hardly, so if utilize the above-mentioned latter's method, can save SI and resolve the time.So, channel switch speed will be faster.
In addition, in the channel-changing method in digital cable broadcasting receiver of the present invention, open cable set-top box to the POD separation, though have been described in detail with embodiment, but in other embodiments, even the digital cable broadcasting receiver after the POD merging set-top box is suitable for the present invention too.
In addition, the term of Shi Yonging (terminology) is to consider the term that defines after the function of the present invention in the present invention, this be according in different field from the personnel's of criminal technique intention or according to relevant scientific and technological knowledge, the term that defines as the basis with content from overall consideration of the present invention.
By above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.
Therefore, the technical scope of this invention is not limited to the content on the specification, must determine its technical scope according to interest field.
By above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.
Therefore, the technical scope of this invention is not limited to the content on the specification, must determine its technical scope according to interest field.
Claims (6)
1, the channel-changing method in the digital cable broadcasting receiver, described method is the rarest more than one channel in a physical channel, the channel-changing method of the digital cable broadcasting receiver of receive channel and program recommended information mainly comprises following step:
(a), behind the succinct form pseudo channel table of parsing conversion, extract the step of channel information if according to the conversion of user's selective channel;
(b) resolve and the program association table/program map table that the program designation is complementary in above-mentioned channel information, extract the step of programme information;
(c) based on the channel and the programme information of said extracted, to the program of the channel in above-mentioned (a), selected adjust with decoding processing after, the step that picture shows.
2, as claim item 1 described channel-changing method in the digital cable broadcasting receiver, it is characterized in that,
Above-mentioned digital cable broadcasting receiver, under the situation of the open cable mode of in access point module, separating, in above-mentioned (a) step, the process of resolving in the system information that receives with access point module outside by succinct form pseudo channel watchband also is another feature of the channel-changing method in the digital cable broadcasting receiver.
3, as claim item 1 described channel-changing method in the digital cable broadcasting receiver, it is characterized in that,
Above-mentioned digital cable broadcasting receiver is separated in access point module under the situation of payout mode, in above-mentioned (b) step, program association table/program map table by with in resolve in the program customizing messages that receives.
4, as claim item 2 or 3 described channel-changing methods in the digital cable broadcasting receiver, it is characterized in that, in above-mentioned (c) step, also comprise:
(c-1) use the channel of said extracted and the programme information chart-information that constituted channel and storing;
(c-2) next, if the channel in the channel chart-information of above-mentioned storage is changed, based on channel and the programme information in the above-mentioned channel mapping table information, to the program of correlated channels adjust with decoding processing after export, in picture, can not see related-program;
(c-3) when the channel chart-information of above-mentioned (c-2) step and storage simultaneously begins, only resolve a program association table/program map table that is complementary with the relevant program designation of presetting channel of reading, compare with the programme information of having stored after extracting program storage information, judge whether it is consistent;
(c-4) in above-mentioned (c-3) step, judged result is if two programme information unanimities, the step that the program in above-mentioned (c-2) step after the decoding processing can be seen in display frame;
(c-5) in above-mentioned (c-3) step, judged result is if two programme informations are inconsistent, in the step of above-mentioned (c-3), based on the programme information after resolving, to the program of correlated channels adjust with decoding processing after, in display frame, show.
5, the channel-changing method in the digital cable broadcasting receiver, described method are to have at least the more than one channel that presets to exist in a physical channel, and the conversion method of the digital cable broadcasting receiver of receive channel and program recommended information comprises:
(a), after the succinct form pseudo channel table of channel is preset in parsing, extract the step of channel information if according to the conversion of user's selective channel;
(b) only resolve with above-mentioned channel information in after program designation and the program association table/program map table being complementary, the step of extraction programme information;
(c) use the channel of said extracted and programme information to constitute listing information and store,, the program of the channel selected in above-mentioned (a) step is adjusted and decoding processing simultaneously based on above-mentioned listing information, and in the step of screen displayed;
(d) next, channel in the channel chart-information of in above-mentioned (c) step, storing, if change, based on channel and the programme information in the above-mentioned channel mapping table information, program to correlated channels is handled back output to adjustment and decoding, can not see the step of related-program in picture;
(e) above-mentioned (d) simultaneously from the storage the channel chart-information, only resolve a program association table/program map table that is complementary with the relevant program designation of presetting channel of reading, after extracting programme information, judge this information whether with the corresponding to step of the programme information of having stored;
(f) in above-mentioned (e) step, judged result is if two programme information unanimities, the step that can see in display frame through the program after the decoding processing in above-mentioned (d) step;
(g) in above-mentioned (e) step, judged result is if two programme informations are inconsistent, in above-mentioned (e) step, based on the programme information of new parsing, to the program of correlated channels adjust with decoding processing after, in the step of screen displayed.
6, as claim item 5 described channel-changing methods in the digital cable broadcasting receiver, it is characterized in that,
In above-mentioned (g) step, judged result is two programme informations when inconsistent, in above-mentioned (e) step, uses the program chart-information of resolving to upgrade behind the channel chart-information and storage.
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| CNB2005100302233A CN100574366C (en) | 2005-09-29 | 2005-09-29 | Channel-changing method in the digital cable set-top box |
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| KR20140132507A (en) * | 2013-05-08 | 2014-11-18 | (주)휴맥스 | Methods and apparatuses of channel switching uing pre-acquisitied psi table |
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