CN1744690A - Open cable personal video recorder and its working method - Google Patents
Open cable personal video recorder and its working method Download PDFInfo
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- CN1744690A CN1744690A CN 200410054117 CN200410054117A CN1744690A CN 1744690 A CN1744690 A CN 1744690A CN 200410054117 CN200410054117 CN 200410054117 CN 200410054117 A CN200410054117 A CN 200410054117A CN 1744690 A CN1744690 A CN 1744690A
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Abstract
The invention is related to personal video recorder (PVR), specially to open cable PVR capable of watching and recording more than two cryptographic charging digital line broadcasting channels at same time. The invention also discloses working method. The method includes steps: when providing one cryptographic digital line broadcasting channel for watching, the PVR stores another cryptographic channel in form of transmission stream to storage media at same time; PVR determines whether the channel being watched is ended; if yes, the method decrypts the stored encrypted transmission stream, and stores the decrypted clear steam to storage media again. Thus, the invention provides effect for carrying out watching at one channel and recording at another channel through open cable PVR.
Description
Technical field
The present invention relates to personal video record (PVR) receiving system, the open cable PVR receiving system and the method for work thereof that relate to especially.
Background technology
Now, implementing the digital cable broadcast project of each exclusive mode of enterprise, thereby forming and corner the market but not open competition market in the U.S..For the drawback that prevents that this from cornering the market and producing, advancing digital cable standard one open cable (open cable) specification of implementing publicity pattern and can buying at retail shop.
For acting in agreement therewith, also the digital cable standard mode is decided to be the open cable mode in Korea S, the wired broadcasting industrialist is also carrying out business and is preparing.
Recently, when diversified digital broadcasting etc. was come into operation, expensive goods was also being put on market, and particularly built-in hard disk (Hard disk) PVR (Personal Video Recoder) function is just becoming the Core Feature of high-grade household electrical appliances.
In the PVR product, though various functions are arranged, the function of when watching certain broadcasting, another channel being recorded wherein-watch and record (Watch; Record) function is essential as most important characteristic for numeral, is just rising to show differential factor the most.
Fig. 1 is to use the pie graph of digital cable PVR receiving system of the digital cable broadcast of existing each exclusive mode of enterprise.
As shown in Figure 1, the wire signal of input is separated into two parts and imports to Tuner0 1 and Tuner1 2.At this moment, the channel that the user wants to watch current broadcast carries out tuning (tuning) by Tuner0 1, and the channel of wanting to record is then undertaken tuning by Tuner1 2.
If it is tuning that channel carries out in Tuner0 1 and Tuner1 2, then export with the form of TS (Transport Stream) via separately QAMdemodulator (quadrature amplitude modulation demodulator).At this moment, encrypt under the situation that is charging channel, this encryption is by CASConditional Access System) module 3, export with the clear stream through deciphering.
Under the situation that is above-mentioned built-in CAS module 3, can carry out descramble simultaneously to two channels.Thereby, all export via 3 two channels of CAS module with clear stream through deciphering.
So the channel of wherein wanting to watch is being exported and after decoding (decoding), exported by AV to MPEG-2 and AC-3decoder5 by triple demux 4, the user then can watch broadcasting.
And, want the clear stream of another channel of recording to record among the HDD (Hard Disk Drive) 7 by triple demux4 and HDD controller 6.In the time of in as above recording HDD 7, additional time stamp (time mark) carries out record on clear stream.
Carry out record by additional time stamp on c1ear stream, when from HDD 7, reading and playing or carrying out trick play (when watching on-the-spot broadcasting, suspending or playback), then utilize time stamp, therefore can successfully carry out and watch and record (watch﹠amp; Record) function.
But there are the following problems for the PVR receiving system of this built-in CAS module 3: formed the supply the market of part business monopoly but not open competition market, failed to observe the open cable specification of the standard that is defined as in the U.S. and Korea S.
Therefore, when existing in the POD that use is decrypted in the open cable (Point ofDeployment) module, POD module can only once be decrypted 1 channel, then can't realize the open cable PVR STB (problem of SetTop Box that can watch and record to the channel more than 2.
Thereby, as the method that is used to realize open cable PVR STB, can just imagine when recording to be stored among the HDD method that is decrypted again when playing afterwards with the TS form of encrypting.But in order to untie CAS (condition receiving system), POD obtains deciphering password information necessary and understands from Head-end, and this information can change according to the time.So, following problem can take place: record among the HDD with the form of encrypting, when playing, because code reading information has changed, can't watch the broadcast program that is write down after considerable time.
Because as above problem and can't with numeral competition epoch of satellite and earthwave in provide under the situation of high-grade function-open cable receiving system, wired industrialist has lost the status in competition, wired industry atrophy.If becoming, wired digital translation that the U.S. has a large amount of consumers to use with Korea S fallen behind, then generally speaking, also backward to the conversion of digital TV with regard to country.
Summary of the invention
Thereby above-mentioned prior art problems works out the object of the invention in order to solve just, and it provides in digital cable standard-open cable specification of observing the U.S. and Korea S, carries out the major function of PVR-watch and record (watch smoothly; Record) apparatus and method of function.
For achieving the above object, open cable PVR according to the present invention design comprises: the input user wants first tuner of an encoded channel watching, the input user wants second tuner of another encoded channel of recording, to under encrypted state, be converted to the demodulator of the form that transmits stream through tuning channel, the transmission stream that is in encrypted state is deciphered and is converted into the POD module (module) of non-encrypted stream, the storage medium that the non-encrypted stream that transmission stream that wanting in the transmission stream that is in encrypted state recorded and above-mentioned transmission stream are converted in the POD pattern stores is decoded and is carried out MPEG-2 and the AC-3 decoder that AV exports non-encrypted stream.
Above-mentioned storage medium is HDD ideally.
The present invention also provides the method for work of above-mentioned open cable PVR, comprises the steps:
In a digital cable broadcast channel of watching encrypted, the channel of desired another encryption is stored in the storage medium with the form that transmits stream;
Whether the channel of watching has been finished to judge;
When the channel watched finishes, stored encrypted transport stream is decrypted and is stored in the media once more with the form of unencrypted stream.
The above-mentioned process of watching an encrypted digital broadcast channel comprises the steps:
Obtain broadcasting channel by tuner;
The broadcasted content that is obtained is converted to the form that transmits stream under encrypted state;
The transmission stream that will be in encrypted state is non-encrypted stream by the PLD mode switch;
Non-encrypted stream is decoded and carried out AV output.
Another broadcast channel of encrypting is comprised the steps: with the process that the form that transmits stream stores
Obtain broadcasting channel by tuner;
The broadcasted content that is obtained is converted to the form that transmits stream under encrypted state;
The transmission stream that will be in encrypted state is stored in the storage medium.
The process whether channel of watching has been finished to judge comprises:
Whether confirm transmitting stream by tuner output; With
To whether there being the stream of playing in the storage medium confirm.
The process that the channel of encrypting is decrypted and stores once more comprises the steps:
Read encrypted transport stream stored in the storage medium and be decrypted, be converted to non-encrypted stream by the POD pattern;
Non-encrypted stream is stored in the storage medium.
In the process that is stored into storage medium once more,, then comprise step: the terminal position information that reads the storage medium that transmits stream and non-encrypted stream are stored terminal position information again store if the situation that the user watches broadcasting takes place;
Watch that to the user situation of broadcasting finishes to carry out before standby;
If watching the situation of broadcasting finishes then begins to carry out stage of storage operation once more from terminal position again.
As described above, open cable PVR receiving system according to the present invention's design has following effect: in digital cable standard-open cable specification of observing the U.S. and Korea S, only use among the open cable PVR STB of the POD that 1 charging channel is decrypted, for the charging channel more than 2, also can carry out the function of the major function of PVR-watch simultaneously and record smoothly.
By the above content that is illustrated, the person skilled in art it should be understood that and can carry out diversified change and modification within the scope that does not break away from technological thought of the present invention.
Thereby, the content that technical scope of the present invention is not limited among the embodiment to be write down, and should determine by patent claim.
Description of drawings
Fig. 1 is a pie graph of showing existing digital cable PVR;
Fig. 2 is the pie graph of showing according to the open cable PVR that is designed by the present invention;
Fig. 3 a～3b is a flow chart of showing the method for work of the PVR that designs according to the present invention.
Symbol description
203：Triple?demux 204：POD?I/F?chip
205:POD 206:MPEG-2 and AC-3 decoder
207:HDD controller 208:HDD
209：CPU
Embodiment
Below, just, illustrated with reference to accompanying drawing according to the formation and the effect of desirable embodiment design of the present invention.
Fig. 2 is the pie graph of showing according to the open cable PVR that is designed by the present invention.
As shown in Figure 2, the open cable PVR receiving system according to the present invention's design has the structure that POD (Point of Deployment) is placed the outside according to the open cable specification.
Working condition to open cable PVR receiving system with this structure with reference to Fig. 2 and appended flow chart of the present invention-Fig. 3 a, 3b, is explained as follows.
At first, wired input signal is separated into two parts and to Tuner0201 and Tuner1202 input.The channel that the user wants to watch current broadcast carries out tuning (tuning) by Tuner0201, and the channel of wanting to record is then undertaken tuning by Tuner1 202.
If in Tuner0 201 and Tuner1 202, channel is carried out tuning, then via separately QAM demodulator form output with TS (Transport Stream).(S10，S15)
At this moment, then all encrypt when 2 channels all are charging channel, the channel that the user wants to watch at first transmits to PODmodule 205 via Triple demux 203 and by POD I/F chip 204.(S25)
The stream that is transmitted (stream) after deciphering, exports (S35) via POD I/Fchip 204 to MPEG-2 and AC-3decoder206 again in POD module 205.The clear stream of the deciphering of being exported after decoding (decoding) (S45), exports the user by AV and then can watch broadcasting in MPEG-2 and AC-3decoder206.(S55)
And, want the stream of another channel of recording this moment, because POD module 205 once can't be decrypted more than one channel, then the state with not deciphering is stored among the HDD (Hard Disk Drive) 208 by Tripledemux and HDD controller 207.In the time of in as above being stored into HDD 208, to the TS that is in encrypted state again affix time stamp store.
In stored encryption stream continues to be stored into process among the HDD 208, check whether the user is watching broadcasting; In the user does not watch the time of broadcasting, then from HDD 208, read stream and transmit to POD module 205.(S60)
At this moment, whether the user is being watched the condition that broadcasting is judged is whether MPEGTS (Transport Stream) is confirmed (S40) from 2 Tuner, 201,202 outputs, and also to whether existing the stream of broadcast to confirm among the HDD 208.(S50)
Through confirming, if above-mentioned stream does not export, then be judged as the user and do not watch broadcasting, and read the stream of the encryption of being write down and transmit to POD module 205.
At this moment, owing to make definition in specification, even so that the user closes the power supply of open cable receiving system, the open cable receiving system also can be and communicates with the wired broadcasting platform and open internal electric source, thereby can successfully carry out above-mentioned action.
The stream of 205 pairs of receptions of POD module is decrypted.Through the mux of the clear stream of deciphering by being positioned at Triple demux 203 front ends to Triple demux 203 feedbacks (feedback).
The additional once more independently timestamp of the clear stream of 203 pairs of above-mentioned deciphering of Triple demux also records among the HDD 208 once more by HDD controller 207, and by playing smoothly after the stream that the stream that is write down is carried out information updating (update), make being write down.(S80)
As above, in reading HDD 208 in stored encryption stream and the process handled, watch once more the user under the situation of broadcasting (S100), then be stored into the terminal hard disk position of being read till current, and the information of the terminal hard disk position that stores after deciphering is stored and manages.(S110)
After this, if the user finish to watch, then utilize stored information to proceed follow-up work, will encrypt stream and all be converted to clear stream and be stored among the HDD 208; By this, can successfully watch the stream that is write down later on.
Claims (8)
1. an open cable personal video record is characterized in that, comprising:
The input user wants first tuner of an encoded channel watching,
The input user wants second tuner of another encoded channel of recording,
To under encrypted state, be converted to the demodulator of the form that transmits stream through tuning channel,
The POD module that non-encrypted stream was deciphered and be converted into to the transmission stream that is in encrypted state,
The storage medium that the non-encrypted stream that is converted into stores is flowed in the transmission stream that will record in the transmission stream that is in encrypted state and above-mentioned transmission in the POD pattern,
MPEG-2 and AC-3 decoder that non-encrypted stream is decoded and carried out AV output.
2. as claim 1 a described personal video record, wherein said storage medium is HDD.
3. the method for work of an open cable personal video record comprises the steps:
(a) in a digital cable broadcast channel of watching encrypted, the channel of desired another encryption is stored in the storage medium with the form that transmits stream;
(b) whether the channel of watching has been finished to judge;
(c) when the channel watched finishes, stored encrypted transport stream is decrypted and is stored in the media once more with the form of unencrypted stream.
4. method of work as claimed in claim 3, the described process of an encrypted digital broadcast channel of watching comprises the steps:
(a) obtain broadcasting channel by tuner,
(b) broadcasted content that is obtained is converted to the form that transmits stream under encrypted state,
(c) the transmission stream that will be in encrypted state is non-encrypted stream by the PLD mode switch,
(d) non-encrypted stream is decoded and carry out AV output.
5. method of work as claimed in claim 3, the step that the form that another broadcast channel of encrypting is flowed with transmission stores:
(a) obtain broadcasting channel by tuner;
(b) broadcasted content that is obtained is converted to the form that transmits stream under encrypted state;
(c) the transmission stream that will be in encrypted state is stored in the storage medium.
6. method of work as claimed in claim 3, the process whether channel of watching has been finished to judge may further comprise the steps:
(a) whether confirm transmitting stream by tuner output;
(b) to whether existing the stream of playing to confirm in the storage medium.
7. method of work as claimed in claim 3 is decrypted and carries out storage process once more the channel of encrypting and may further comprise the steps:
(a) read encrypted transport stream stored in the storage medium and be decrypted, be converted to non-encrypted stream by the POD pattern;
(b) non-encrypted stream is stored into stage in the storage medium.
8. method of work as claimed in claim 3 in the process that is stored into storage medium once more, if the situation that the user watches broadcasting takes place, then may further comprise the steps:
(a) the terminal position information that reads the storage medium that transmits stream and non-encrypted stream being stored terminal position information again stores;
(b) watch that to the user situation of broadcasting finishes to carry out before standby;
(c) finish then begin to carry out storage operation again from terminal position once more if watch the situation of broadcasting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410054117 CN1744690A (en) | 2004-08-30 | 2004-08-30 | Open cable personal video recorder and its working method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410054117 CN1744690A (en) | 2004-08-30 | 2004-08-30 | Open cable personal video recorder and its working method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1744690A true CN1744690A (en) | 2006-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410054117 Pending CN1744690A (en) | 2004-08-30 | 2004-08-30 | Open cable personal video recorder and its working method |
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| Country | Link |
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| CN (1) | CN1744690A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101466005B (en) * | 2008-11-14 | 2010-06-02 | 深圳创维数字技术股份有限公司 | Method for recording TV program for digital television and digital television |
| CN101141601B (en) * | 2006-09-04 | 2010-07-21 | 联发科技（美国）股份有限公司 | Personal video recorder having improved data access and method thereof |
| US10057536B2 (en) | 2012-12-31 | 2018-08-21 | Arcelik Anonim Sirketi | Video recording device |
-
2004
- 2004-08-30 CN CN 200410054117 patent/CN1744690A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101141601B (en) * | 2006-09-04 | 2010-07-21 | 联发科技（美国）股份有限公司 | Personal video recorder having improved data access and method thereof |
| CN101466005B (en) * | 2008-11-14 | 2010-06-02 | 深圳创维数字技术股份有限公司 | Method for recording TV program for digital television and digital television |
| US10057536B2 (en) | 2012-12-31 | 2018-08-21 | Arcelik Anonim Sirketi | Video recording device |
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| WD01 | Invention patent application deemed withdrawn after publication |