CN1189050A - Receiving device and receiving method thereof - Google Patents
Receiving device and receiving method thereof Download PDFInfo
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- CN1189050A CN1189050A CN97126416A CN97126416A CN1189050A CN 1189050 A CN1189050 A CN 1189050A CN 97126416 A CN97126416 A CN 97126416A CN 97126416 A CN97126416 A CN 97126416A CN 1189050 A CN1189050 A CN 1189050A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T9/00—Image coding
- G06T9/007—Transform coding, e.g. discrete cosine transform
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Abstract
In order to play back a plurality of kinds of image data using a single device, a 1394 receiver receives data transmitted via an AV bus according to a format of an IEEE 1394 standard. A separating circuit then determines a format of this data by referring to a prescribed region of a CIP header of this data. When this data is MPEG-PS data, this data is outputted to an MPEG-PS decoder. When this data is MPEG-TS data, this data is outputted to an MPEG-TS decoder. When this data is DVCR SD data, this data is outputted to a DVCR-SD decoder. The MPEG-PS decoder, MPEG-TS decoder and the DVCR-SD decoder then decode the supplied data of respective formats.
Description
The present invention relates to a kind of receiving system and method for reseptance thereof, relate in particular to a kind of like this receiving system and method for reseptance thereof, it deciphers the data that received according to the form of received data on any of a plurality of decoders.
In recent years, DVD (digital universal disc) video (" DVD " is called for short in the back) standardization, therefore be hopeful to use widely.In DVD, video data is used MPEG (Motion Picture Experts Group)-PS (program stream) method compress and record.DVD player is in the driver element playback of DVD, and deciphers and output to a television set from the MPEG-PS data that DVD plays a decoder.So show to image that should data.
On the other hand, digital satellite broadcasting also becomes very universal.The video data of digital satellite broadcasting transmission adopts the compression of MPEG-TS (transport stream) method.Therefore, the receiver of reception digital satellite broadcasting should have a built-in decoder to be used to decipher the MPEG-TS data.
Yet, as mentioned above, when the image that appreciate to remove the DVD player broadcast as the image of digital satellite broadcasting or the image of digital video cassette recorder great amount of images such as (DVCR) time, because the image data format difference of corresponding these images is for all these images of resetting just have to provide separate playback system.Therefore cause the volume of device very big.
In order to address the above problem, the present invention couples together via a digital interface and a device by the multiple arrangement that will handle various view data, this device has the decoder of a plurality of decoding view data, thereby has realized using an independent device these view data of resetting.
To achieve these goals, according to the present invention, a kind of receiving system is provided, be used to receive via a digital interface from a plurality of transmitting devices with specific data form coded data, and according to specific data form decoding data, this receiving system comprises: a receiver; One first decoder; One second decoder; With a feed unit.Receiver receives the data of at least the first and second forms, the data of first decoder for decoding, first form, the data of second decoder for decoding, second form.Feed unit will be offered in first and second decoders any by the data that receiver receives according to the form of data.
In this receiving system, data can be included in the packet, and feed unit will be offered in first and second decoders any by the data that receiver receives according to the data format that writes this packet appointed area.
The appointed area can be a common synchronization packet header (CIP) of synchronization packets.
Digital interface can be a digital interface that meets Institute of Electrical and Electronics Engineers (IEEE) 1394 standards.
Receiver can receive the packet of any data with first and second forms that transmit in Institute of Electrical and Electronics Engineers 1394 standard synchronous communications.
Receiving system also can comprise: a multiplexer, import to it from the data of first and second decoders output; And a display circuit, be used to show data from multiplexer output.The data of this receiver parallel receive first and second forms in synchronous communication, and display circuit shows a plurality of images corresponding to each data in real time simultaneously on single picture.
The recipient of this receiving system can also manufacture the data that can receive the 3rd form, and also comprises the 3rd decoder of the data that are used to decipher the 3rd form.
In addition, first, second, third form can be respectively the program stream format of system of Motion Picture Experts Group (MPEG), the transport stream format of mpeg system and the standard definition format of digital VCR.
In addition, first and second decoders all can comprise a memory with at least 1.2 Mbytes memory capacity, are used for the temporary transient storage data when decoding.
Also have, according to the present invention, a kind of method of reseptance is provided, be used to receive via a digital interface from a plurality of transmitting devices with a specific data form coded data, and according to data designated form decoding data, this method of reseptance comprises the steps: to receive at least one data of first and second forms; According to data format the data that receive are offered in first and second decoders any; And the data that decoding receives in any of first and second decoders.
In this method of reseptance, data can be included in the packet, and the data that receive according to be provided for corresponding to the value that writes the data format in the packet appointed area in first and second decoders any.
The appointed area can be a common synchronization communication data packet header (CIP) of a synchronization packets.
Digital interface can be a digital interface that meets Institute of Electrical and Electronics Engineers 1394 standards.
The packet that receives can be the packet with any data of first and second forms that transmit in the synchronous communication of Institute of Electrical and Electronics Engineers 1394 standards.
Also have, in this method of reseptance, can be multiplexed from each data of first and second decoders output, and can show the dateout that this is multiplexed, the data of parallel receive first and second forms in synchronous communication, and a plurality of images of corresponding each data can be simultaneously displayed in the independent picture in real time.
With reference to the following description of accompanying drawing, purpose of the present invention, advantage and feature will be clearer, in the accompanying drawing:
Fig. 1 represents the block diagram of an example of AV system configuration;
Fig. 2 represents wherein to have used the block diagram according to an example of the digital TV structure of receiving system of the present invention;
Fig. 3 is the schematic diagram of the structure of expression asynchronous communication packet;
Fig. 4 is the schematic diagram of form of a CIP title of the packet of presentation graphs 3; With
Fig. 5 is expression is synthesized the example of an image demonstration by a plurality of images a schematic diagram.
Fig. 1 represents an example of AV system configuration.In this AV system, the digital television of using according to receiving system of the present invention (digital TV) is connected with an AV bus 6.Thereby MPEG-PS data, MPEG-TS data and the DVCR SD data (single-definition) that provide via AV bus 6 are provided 1394 built-in receivers 11 (receiver).These data are deciphered on built-in decoder, thereby show the image of decoding.
The MPEG-PS data of DVD player 2 playback records on DVD, and export to digital television TV1 via AV bus 6, these data are undecoded data.
Personal computer carries out various processing with software and uses built-in DVD driver 21 to finish the reproduction of DVD ROM except that the DVD vision signal etc., thus view data for example MPEG-PS data, MPEG-TS data and DVCR SD data are exported to digital TV1 via AV bus 6.
Set-top box (STB) 5 receives the broadcast singal that is transferred to designation number satellite broadcasting by artificial satellite by antenna 42, and exports for example view data of user selected program (MPEG-TS data) by AV bus 6 to digital TV1.
Fig. 2 represents an example of digital TV1 structure.
On digital TV1,1394 receivers 11 according to the form of 1394 standards receive through AV bus 6 send data (packet), and data that receive to split circuit 12 (delivery unit) output.
With reference to the appointed area (narration later on) of CIP (common synchronization packet) title that receives data, split circuit 12 is determined the form of these data, afterwards these data is exported to the decoder of corresponding this form.
That is to say that when the data that provide were the MPEG-PS data, split circuit 12 was exported to MPEG-PS decoder 13 (first decoder) with these data.When the data that provide were the MPEG-TS data, split circuit 12 was exported to MPEG-TS decoder 14 (second decoder) with these data.When the data that provide were DVCR SD data, split circuit 12 was exported to DVCR SD decoder 15 (the 3rd decoder) with these data.
The MPEG-TS data that 14 decodings of MPEG-TS decoder are provided to the digital video signal of a combiner circuit 16 and a generation of multiplexer 17-1 output, and are exported the digital audio and video signals of a generation to multiplexer 17-2.
MPEG-TS decoder 14 has the internal memory 51 of one at least 1.2 Mbytes memory capacity.This memory 51 is as a video transmission buffer and a decoding buffer of meeting mpeg standard.
The video transmission buffer is the buffer of one 234.5 kilobytes total amount, promptly the transmission buffer of 0.5 kilobytes (TB: transmission buffer), main buffer) and the unit stream buffer of 224 kilobytes (EB: the unit stream buffer) 10 kilobytes main buffer (MB:.
When eliminating packet header, use the transmission buffer in these buffers for the MPEG-TS data.
Main buffer is used to reduce the message transmission rate of unit stream buffer.Transmission rate from the transmission buffer to the main buffer is set to speed when multiplexed, and (for example, 18Mbps), and the message transmission rate from main buffer to the unit stream buffer is set to lower speed (for example, 15Mbps).
The content of unit stream buffer memory cell stream is up to time and the arrival that is included in the time of the DTS (decoding time sign) in the mpeg data of corresponding time tag PTS (demonstration time tag).When this arrived time, the data of access unit outputed to (not shown) on the built-in decoder in the MPEG-TS decoder 14.The data of unit stream buffer output afterwards are decoded on this decoder.
When using mpeg format to decipher, the maintenance of decoding buffer is treated decoded image (picture) and is used for a picture (I picture, P picture etc.) of comparison.Therefore decipher the memory capacity (an I picture and a P picture) that buffer needs at least two pictures.
When picture signal was the NTSC form, a picture comprised 720 * 480 pixels.Because brightness signal Y is 4: 2: 0 with the ratio of two colour difference signal Cb and Cr, so the memory space that each picture needs approximately is 0.5 Mbytes (=720 * 480 * (4+2+0)/4).So in this situation, the decoding buffer of two pictures approximately needs the memory capacity of 1.0 Mbytes.
On the other hand.When picture signal was the PAL form, a picture comprised 720 * 576 pixels, and the ratio of luminance signal and two colour difference signal Cb and Cr is 4: 2: 0.So the memory space that each picture needs approximately is 0.6 Mbytes (=720 * 576 * (4+2+0)/4).So in this situation, the memory capacity of the decoding buffer of two pictures approximately needs 1.2 Mbytes.
Therefore, memory 51 needs the memory capacity (≈ 1.0 Mbytes+234.5 kilobytes) of at least 1.2 Mbytes.
The MPEG-PS data that 13 decodings of MPEG-PS decoder are provided to the digital video signal of a combiner circuit 16 and a generation of multiplexer 17-1 output, and are exported the digital audio-frequency data of a generation to multiplexer 17-2.
MPEG-TS decoder 13 has the internal memory 51 of one at least 1.2 Mbytes memory capacity.This memory 51 uses as aforesaid main buffer, unit stream buffer and decoding buffer.The memory capacity of 8 kilobytes is enough to satisfy the needs of the main buffer in the MPEG-PS decoder 13.
The DVCR-SD data that 15 decodings of DVCR-SD decoder are provided to the digital video signal of a combiner circuit 16 and a generation of multiplexer 17-1 output, and are exported the digital audio and video signals of a generation to multiplexer 17-2.
For example, an image in three images is as a master image, and another image is as a number of sub images, and produce when subimage put into image of master image, can be with at United States Patent (USP) the 4th, 746, disclosed circuit uses as combiner circuit 16 in No. 983.
When three images are so arranged when being presented on the picture, disclosed circuit in unexamined Japanese patent application text 56-136089 number can be used as combiner circuit 16.
In addition, when a synthetic character string such as the title of the device of output image data, disclosed circuit in unexamined Japanese patent application text 61-194982 number can be used as combiner circuit 16.
Multiplexer 17-1 response will be outputed on the display circuit 18 by any one digital signal that MPEG-PS decoder 13, MPEG-TS decoder 14, DVCR-SD decoder 15 and combiner circuit 16 provide by the control signal that control circuit 22 provides.
Multiplexer 17-2 response will be outputed on the D/A converter 20 by any one digital audio and video signals that MPEG-PS decoder 13, MPEG-TS decoder 14 and DVCR-SD decoder 15 provide by the control signal that control circuit 22 provides.
Image corresponding to the digital video signal that is provided is provided on CRT19 display circuit 18.
D/A converter 20 converts the digital audio and video signals that is provided to simulated audio signal, and to should signal output sound on loud speaker 21.
The work of the digital TV1 of narration below.
At first, 1394 receivers 11 of digital TV1 receive with the asynchronous communication data packets for transmission, and the data (data segment) that will be included in the received data packet output on the split circuit 12.
Fig. 3 represents the structure of the packet of asynchronous communication.The asynchronous communication packet comprises a data packet header, a title CRC, a data segment and a data CRC.
Packet header also comprises: " data length ", the length of its expression data; " Tag ", the kind of its expression data format that packet transmitted; " passage ", it represents the port number (1 to 63) of this packet; " T code ", it represents code process; " SY ", it is illustrated in the synchronizing code of regulation in each application.Title CRC (title-CRC) is the packet header error detection code, and data CRC (data-CRC) are data segment (data segment) error detection codes.Data segment comprises a CIP title and real time data, and these data are the real time datas that are transmitted.
Fig. 4 represents the form of CIP title.The CIP title comprises: one send nodal point number SIP, packaged unit DBS, mark FN who is used to divide equally the data of packing, one for make in equal timesharing data length be suitable for additional nybble unit (quadlet) the number QPC (a nybble unit is 4 bytes) of pre-determined constant data length, source data packet title sign SPH, one be used for the counter DBC of determination data packet loss, a signal format FMT and a form dependent segment FDF.Here, rsv is a spare area.
Next, which is consistent with this value to split circuit 12 with reference to the value in the FMT district of the data CIP title that provides and in MPEG-PS data, MPEG-TS data and the DVCR SD data determining to be provided.
When split circuit 12 has determined that these data are the MPEG-PS data, these data are outputed to MPEG-PS decoder 13.When being defined as the MPEG-TS data, these data are outputed to MPEG-TS decoder 14.When being defined as the DVCR-SD data, these data are outputed to DVCR-SD decoder 15.
When these data are provided, these data are then by a decoding in MPEG-PS decoder 13, MPEG-TS decoder 14 or the DVCR-SD decoder 15, the digital video signal of a generation is output to combiner circuit 16 and multiplexer 17-1 afterwards, and the digital audio and video signals of a generation outputs to multiplexer 17-2.
Then, combiner circuit 16 is according to synthesizing digital video signal by control circuit 22 mode designated, thereby the image corresponding to the digital video signal that is provided by MPEG-PS decoder 13, MPEG-TS decoder 14 and DVCR-SD decoder 15 is presented on the picture, and He Cheng digital video signal outputs on the multiplexer 17-1 then.
Fig. 5 represents to show the example of a composograph.In the example of the demonstration of Fig. 5, image corresponding to the SD data of DVCR is presented at picture upper left quarter zone as the image from DVCR 4, image corresponding to the MPEG-TS data is presented at picture upper right quarter zone as the image from STB 5, and is presented at picture lower left quarter zone as the image from DVD player 2 corresponding to the image of MPEG-PS data.
Provide the title (" DVCR ", " STB " and " DVD player ") of the device of each image to be presented at the bottom of each image display area.
In present embodiment, the data of different-format in asynchronous communication by 1394 receiver parallel receives.Therefore, the image of a plurality of corresponding these data respectively can be presented on the picture simultaneously in real time.
Then, in the digital video signal that is provided, multiplexer 17-1 is to display circuit 18 output (promptly selecteed by the result of user's operation of importation 23) digital video signal by control circuit 22 appointments.Afterwards, vision signal display image on CRT19 of being provided of display circuit 18 correspondences.
On the other hand, in the digital audio and video signals that is provided, multiplexer 17-2 is to the digital audio and video signals of D/A converter 20 outputs by control circuit 22 appointments.Afterwards, D/A converter 20 is converted to simulated audio signal with these digital audio and video signals, simultaneously the sound of corresponding these simulated audio signals of output on loud speaker 21.
By the way, digital TV1 is via the data of AV bus 6 each form of reception, and corresponding this data format uses decoder to decipher this data, and reproduced picture and sound.
In the AV of Fig. 1 system, have only a digital TV1 to link to each other, but other digital TV1 also can be connected with AV bus 6, and the data of multiple form also so decoded in the same manner with AV bus 6.
According to the present invention, receive the data of first to the 3rd form via a digital interface that meets IEEE 1394 standards, and the data that receive are offered in first to the 3rd decoder any one according to the form of data.Afterwards, can be in first to the 3rd decoder these data of decoding in any one.Therefore, use an independent device just can reset multiple view data, thereby can reduce the size of device.
Claims (18)
1. receiving system, be used to receive through digital interface from a plurality of transmitting devices with specific data form coded data, and decipher described data according to described specific data form, this receiving system comprises:
A receiver is used to receive the data of at least the first and second forms;
One first decoder is used to decipher the described data of described first form;
One second decoder is used to decipher described second formatted data; And
A feed unit is used for will being offered by the data that described receiver receives according to described data format any of described first and second decoders.
2. receiving system as claimed in claim 1, wherein said data are included in the packet, and the data that described receiver received according to a value corresponding to the form of the described data that write described packet appointed area of described feedway offer in described first and second decoders any.
3. receiving system as claimed in claim 2, wherein said appointed area are common synchronization packet header of synchronization packets.
4. receiving system as claimed in claim 1, wherein said digital interface are digital interfaces that meets Institute of Electrical and Electronics Engineers 1394 standards.
5. receiving system as claimed in claim 1, wherein said receiver receives packet, and this packet has any data of described first and second forms that transmit in Institute of Electrical and Electronics Engineers 1394 standard synchronous communications.
6. receiving system as claimed in claim 5 also comprises:
A multiplexer is imported to it from the data of described first and second decoders output; And
A display circuit is used to show the data from described multiplexer output,
The described data of described receiver parallel receive first and second forms in synchronous communication, and
Described display circuit shows a plurality of images corresponding to each described data in real time simultaneously in an independent picture.
7. receiving system as claimed in claim 1, wherein said receiver is manufactured to the data that can receive the 3rd form, and comprises the 3rd decoder that is used to decipher described the 3rd formatted data.
8. receiving system as claimed in claim 1, wherein said first form are program stream format of system of Motion Picture Experts Group.
9. receiving system as claimed in claim 1, wherein said second form are transport stream formats of system of Motion Picture Experts Group.
10. receiving system as claimed in claim 7, wherein said the 3rd form are standard definition formats of digital video cassette recorder.
11. receiving system as claimed in claim 8, wherein said first decoder comprises a memory, is used for temporary transient storage data when decoding, and described memory has the memory capacity of at least 1.2 Mbytes.
12. receiving system as claimed in claim 9, wherein said second decoder comprises a memory, is used for temporary transient storage data when decoding, and described memory has the memory capacity of at least 1.2 Mbytes.
13. a method of reseptance, be used to receive through digital interface from a plurality of transmitting devices with specific data form coded data, and decipher described data according to described specific data form, this method of reseptance comprises the steps:
Receive the data of at least the first and second forms;
According to described data format the data that receive are offered in first and second decoders any; And
The described data of decoding on any of described first and second decoders.
14. method of reseptance as claimed in claim 13, wherein said data are included in the packet, and according to corresponding to a value of the form of the described data that write described packet appointed area the data of described reception being offered in described first and second decoders any.
15. method of reseptance as claimed in claim 14, wherein said appointed area are common synchronization packet header of synchronization packets.
16. method of reseptance as claimed in claim 13, wherein said digital interface are digital interfaces that meets Institute of Electrical and Electronics Engineers 1394 standards.
17. method of reseptance as claimed in claim 13, wherein reception has the packet of any data of described first and second forms that transmit in described Institute of Electrical and Electronics Engineers 1394 standard synchronous communications.
18. method of reseptance as claimed in claim 17, wherein from each data of described first and second decoders output by multiplexed, and show by multiplexed dateout,
The described data of parallel receive first and second forms in described synchronous communication, and
A plurality of images of corresponding each described data are simultaneously displayed in the independent picture in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97126416A CN1189050A (en) | 1996-11-15 | 1997-11-15 | Receiving device and receiving method thereof |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP304401/96 | 1996-11-15 | ||
| CN97126416A CN1189050A (en) | 1996-11-15 | 1997-11-15 | Receiving device and receiving method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN1189050A true CN1189050A (en) | 1998-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97126416A Pending CN1189050A (en) | 1996-11-15 | 1997-11-15 | Receiving device and receiving method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1306710C (en) * | 2001-04-11 | 2007-03-21 | 华邦电子股份有限公司 | Programmable running length decoder |
-
1997
- 1997-11-15 CN CN97126416A patent/CN1189050A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1306710C (en) * | 2001-04-11 | 2007-03-21 | 华邦电子股份有限公司 | Programmable running length decoder |
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