CN100391249C - Digital video frequency broadcasting switching method and apparatus thereof - Google Patents
Digital video frequency broadcasting switching method and apparatus thereof Download PDFInfo
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- CN100391249C CN100391249C CNB2005100960774A CN200510096077A CN100391249C CN 100391249 C CN100391249 C CN 100391249C CN B2005100960774 A CNB2005100960774 A CN B2005100960774A CN 200510096077 A CN200510096077 A CN 200510096077A CN 100391249 C CN100391249 C CN 100391249C
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Abstract
The present invention relates to a digital video broadcast converting method and a device thereof, particularly, a method for converting transmission code streams into audio serial interface format and a device for converting thereof. The method orderly comprises the following steps that step 1, transmission code stream data is received; step 2, the transmission code stream data is preprocessed; step 3, bit rate of the preprocessed transmission code stream code is adjusted to be lower than the maximum rate of the audio serial interface format; step 4, the transmission code stream data is converted into the audio serial interface format data; step 5, the audio serial interface format data is output from the audio serial interface. Because the present invention provides the digital video broadcast converting method and the device thereof, chips with the audio serial interface can add a receiving function of the digital video broadcast.
Description
One, technical field
The present invention relates to a kind of digital video broadcast transition method and device thereof, especially a kind of method and device thereof that transmission code stream is converted to the audio serial interface form.
Two, background technology
Two kinds of data formats of system's regulation of MPEG2 are program stream (PS) and transmission code stream (TS), and wherein, program stream is mainly local Application Design, and Frame length is unfixing, is used in the lower occasion of error code (as DVD); Transmission code stream is used for digital video broadcasting (DVB) and is designed, because channel circumstance is unpredictable, transmission code stream is made of fixing bag length, and helping can be synchronous rapidly under the situation that mistake occurs.
Audio serial interface comprises LRCK, BCK, DATA etc.Wherein, BCK is a serial audio frequency bit clock.Its function is DATA to be gone up existing data send in the shift register of audio interface by this clock effect.LRCK be serial audio interface on a left side/the right data letter lock deposits clock.Its function be with data latching in the shift register of interface inside, the audio serial interface data format comprises reference format, I
2S form and left-justify form etc.
DVD plays chip and only accepts program stream, can't import transmission code stream, has audio serial interface but there is part DVD to play chip.
Three, summary of the invention
The present invention is for solving the above-mentioned technical problem that background technology exists, and a kind of digital video broadcast transition method and device thereof are provided, and makes the receiving function that can increase digital video broadcasting on the chip of audio serial interface having.
Technical solution of the present invention is: a kind of digital video broadcast transition method, its special character is: this method comprises the following steps: successively
1) receives the transmission code stream data;
2) the transmission code stream data are carried out preliminary treatment;
3) bit rate of the pretreated transmission code stream data of adjustment makes it be lower than the flank speed of audio serial interface form;
4) the transmission code stream data transaction is become the audio serial interface formatted data;
5) the audio serial interface formatted data is exported from audio serial interface.
Above-mentioned steps 2) in the transmission code stream data being carried out preprocessing process comprises the transmission code stream data is filtered.
Above-mentioned steps 2) in the transmission code stream data is carried out preprocessing process and comprise the preliminary treatment of transmission code stream being carried out descrambling, deciphering or demultiplexing.
Above-mentioned steps 4) concrete steps in are as follows:
4.1) with the ordering of the data based audio serial interface data of transmission code stream sequence requirement, obtain audio serial interface data DATA;
4.2) be that audio serial interface data DATA produces synchronous with it clock BCK;
4.3) produce left and right acoustic channels switching signal L CK, form the audio serial interface formatted data.
Above-mentioned steps 2) in, when the bit rate of the transmission code stream data that receive is lower than the flank speed of audio serial interface form, directly proceeds to step 4).
Above-mentioned audio serial interface data format is reference format, I
2S form or left-justify form.
A kind of device of realizing above-mentioned digital video broadcast transition method, its special character is: this device comprises transmission code stream receiving converter 1, connecting line 2 and the chip 3 with audio serial interface, transmission code stream receiving converter 1 insert the audio serial interface of the chip 3 with audio serial interface by connecting line 2.
Above-mentioned chip 3 with audio serial interface is EM8510 type, EM8511 type, EM8560 type or EM8561 cake core.
DVD plays chip and only accepts program stream, can't import transmission code stream, but DVD plays chip audio serial interface is often arranged.Audio serial interface comprises LRCK, BCK, DATA etc.Wherein, BCK is a serial audio frequency bit clock.Its function is DATA to be gone up existing data send in the shift register of audio interface by this clock effect.LRCK be serial audio interface on a left side/the right data letter lock deposits clock.Its function be with data latching in the shift register of interface inside.The audio serial interface data format comprises reference format, I
2S form and left-justify form etc.The present invention utilizes this audio serial interface, transmission code stream Data Format Transform in the digital video broadcasting is become the data format that can pass through the audio serial interface of audio serial interface, conversion back transmission code stream data just can have the chip of audio serial interface by the audio serial interface input, thereby on this type of chip, increase the receiving function of digital video broadcasting, make digital video broadcasting can be applied on the DVD chip, promptly increased the digital video broadcasting receiving function of DVD chip.
Four, description of drawings
Fig. 1 is a method schematic diagram of the present invention;
Fig. 2 is the schematic diagram of a kind of sequential of embodiment of the invention sound intermediate frequency serial line interface form;
Fig. 3 is the structural representation of apparatus of the present invention.
Five, embodiment
Referring to Fig. 1, concrete grammar of the present invention is as follows:
1) receives the transmission code stream data;
2) the transmission code stream data are carried out preliminary treatment;
3) bit rate of the pretreated transmission code stream data of adjustment makes it be lower than the flank speed of audio serial interface form;
4) the transmission code stream data transaction is become the audio serial interface formatted data;
4.1) with the ordering of the data based audio serial interface data of transmission code stream sequence requirement, obtain audio serial interface data DATA;
4.2) be that audio serial interface data DATA produces synchronous with it clock BCK;
4.3) produce left and right acoustic channels switching signal L CK, form the audio serial interface formatted data.
5) the audio serial interface formatted data is exported from audio serial interface.
Step 2) in the transmission code stream data is carried out preprocessing process and comprise the preliminary treatment that the transmission code stream data are filtered and transmission code stream carried out descrambling, deciphering or demultiplexing.
Step 2) in, when the bit rate of the transmission code stream data that receive is lower than the flank speed of audio serial interface form, directly proceeds to step 4).
Referring to Fig. 2, when carrying out format conversion in step 4), output audio serial line interface sequential is example with Fig. 2, at first need resequence to centre data based audio serial interface data sequence requirement or other, obtains audio serial interface data DATA.Be the synchronous with it clock BCK of DATA generation then, the every output one digit number of DATA certificate, BCK changes one-period, must keep between stationary phase at the individual data bit, produces BCK and goes up the jumping edge, could correctly be received by the receiving chip of audio serial interface.According to the variation of DATA data, BCK can be discontinuous, produces audio frequency left and right acoustic channels switching signal L CK then.The individual BCK period L RCK of per 16,32,64,128 (perhaps other numbers) changes once.Like this, the data transaction that meets audio serial interface is finished.
Referring to Fig. 3, device of the present invention is mainly by transmission code stream receiving converter 1, and connecting line 2 constitutes with the chip 3 with audio serial interface, wherein:
Transmission code stream receiving converter 1 is used for realizing transmission code stream is carried out step 1), 2 as described), 3), 4) Data Receiving and conversion.
The audio serial interface input that connecting line 2 is used to connect the output of transmission code stream receiving converter 1 and has the chip 3 of audio serial interface.
Transmission code stream is converted into the output of audio serial interface form by above-mentioned steps, makes the chip with audio serial interface input increase the function of receiving digital video broadcast data.
Below in conjunction with specific embodiment the present invention is done further detailed description:
At first, the transmission code stream receiving converter 1 of apparatus of the present invention is from front end input transmission code stream, and to 90 MBPSs, transmission code stream can be parallel input or serial input to the transmission code stream data bit-rate from 1 MBPS.Parallel input comprises data bit TSDATA (figure place also can be transformed to other figure places as required based on 8) and clock TSCLK; The serial input comprises data bit TSDATA and clock TSCLK.
The transmission code stream data of 1 pair of input of transmission code stream receiving converter, can advanced line data preliminary treatment, as utilize PID (bag sign) to filter to prevent to import transmission code stream average speed to exceed the audio serial interface maximum speed to cause data to be overflowed losing, also can do the preliminary treatment of transmission code stream descrambling, deciphering, demultiplexing as required.
1 pair of data of transmission code stream receiving converter are carried out after the preliminary treatment, for adapting to the communication speed requirement of audio serial interface, need to adjust the flank speed that pretreated transmission code stream bit rate is lower than the audio serial interface form.In order to realize the variation of data code flow bit rate, can use chip internal or outside buffer, data are sent into buffer according to the bit rate after the preliminary treatment, and from buffer, read according to the receptible speed of audio serial interface.
The transmission code stream receiving converter carries out Data Format Transform to the intermediate data that transmission code stream carries out after data preliminary treatment and the speed adjustment then.When the transmission code stream data rate of transmission code stream receiving converter 1 reception has been lower than the flank speed of audio serial interface form, data directly can be carried out format conversion and do not needed data preliminary treatment and speed adjustment.
When carrying out format conversion, at first need resequence to centre data based audio serial interface data sequence requirement or other, obtain audio serial interface data DATA.Be the synchronous with it clock BCK of DATA generation then, the every output one digit number of DATA certificate, BCK changes one-period, must keep between stationary phase at the individual data bit, produces BCK and goes up the jumping edge, could correctly be received by the receiving chip of audio serial interface.According to the variation of DATA data, BCK can be discontinuous, produces audio frequency left and right acoustic channels switching signal L CK then.The individual BCK period L RCK of per 16,32,64,128 (perhaps other numbers) changes once, and like this, the data transaction that meets audio serial interface is finished.
Claims (7)
1. digital video broadcast transition method, it is characterized in that: this method comprises the following steps: successively
1) receives the transmission code stream data;
2) the transmission code stream data are carried out preliminary treatment;
3) bit rate of the pretreated transmission code stream data of adjustment makes it be lower than the flank speed of audio serial interface form;
4) the transmission code stream data transaction is become the audio serial interface formatted data:
4.1) with the ordering of the data based audio serial interface data of transmission code stream sequence requirement, obtain audio serial interface data DATA;
4.2) be that audio serial interface data DATA produces synchronous with it clock BCK;
4.3) produce left and right acoustic channels switching signal L CK, form the audio serial interface formatted data;
5) the audio serial interface formatted data is exported from audio serial interface.
2. digital video broadcast transition method according to claim 1 is characterized in that: described step 2) the transmission code stream data are carried out preprocessing process and comprise the transmission code stream data are filtered.
3. digital video broadcast transition method according to claim 1 is characterized in that: described step 2) the transmission code stream data are carried out preprocessing process and comprise the preliminary treatment of transmission code stream being carried out descrambling, deciphering or demultiplexing.
4. digital video broadcast transition method according to claim 1 is characterized in that: described step 2), when the bit rate of the transmission code stream data that receive is lower than the flank speed of audio serial interface form, directly proceed to step 4).
5. digital video broadcast transition method according to claim 1 is characterized in that: described audio serial interface data format comprises reference format, I
2S form and left-justify form.
6. device of realizing the described digital video broadcast transition method of claim 1, it is characterized in that: this device comprises transmission code stream receiving converter (1), connecting line (2) and have the chip (3) of audio serial interface, described transmission code stream receiving converter (1) inserts the audio serial interface of the chip (3) with audio serial interface by connecting line (2).
7. device according to claim 6 is characterized in that: described chip (3) with audio serial interface is EM8510 type, EM8511 type, EM8560 type or EM8561 cake core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100960774A CN100391249C (en) | 2005-09-28 | 2005-09-28 | Digital video frequency broadcasting switching method and apparatus thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100960774A CN100391249C (en) | 2005-09-28 | 2005-09-28 | Digital video frequency broadcasting switching method and apparatus thereof |
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| CN1774060A CN1774060A (en) | 2006-05-17 |
| CN100391249C true CN100391249C (en) | 2008-05-28 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11353790A (en) * | 1998-06-08 | 1999-12-24 | Yamaha Corp | Digital video signal transmitter and receiver |
| WO2001027731A1 (en) * | 1999-10-13 | 2001-04-19 | Sony Electronics, Inc. | Enhancing interface to transport streams by pin re-assignment |
| CN1349719A (en) * | 1999-12-30 | 2002-05-15 | 皇家菲利浦电子有限公司 | Method and apparatus for converting data streams |
| JP2004312441A (en) * | 2003-04-08 | 2004-11-04 | Matsushita Electric Ind Co Ltd | Stream conversion device |
| US20050036757A1 (en) * | 2001-09-18 | 2005-02-17 | Alexander Romanowski | Method for converting a video and/or an audio data flow |
| WO2005020557A2 (en) * | 2003-08-13 | 2005-03-03 | Skystream Networks Inc. | Method and system for modeling the relationship of the bit of a transport stream and the bit rate of an elementary stream carried therein |
-
2005
- 2005-09-28 CN CNB2005100960774A patent/CN100391249C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11353790A (en) * | 1998-06-08 | 1999-12-24 | Yamaha Corp | Digital video signal transmitter and receiver |
| WO2001027731A1 (en) * | 1999-10-13 | 2001-04-19 | Sony Electronics, Inc. | Enhancing interface to transport streams by pin re-assignment |
| CN1349719A (en) * | 1999-12-30 | 2002-05-15 | 皇家菲利浦电子有限公司 | Method and apparatus for converting data streams |
| US20050036757A1 (en) * | 2001-09-18 | 2005-02-17 | Alexander Romanowski | Method for converting a video and/or an audio data flow |
| JP2004312441A (en) * | 2003-04-08 | 2004-11-04 | Matsushita Electric Ind Co Ltd | Stream conversion device |
| WO2005020557A2 (en) * | 2003-08-13 | 2005-03-03 | Skystream Networks Inc. | Method and system for modeling the relationship of the bit of a transport stream and the bit rate of an elementary stream carried therein |
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| CN1774060A (en) | 2006-05-17 |
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