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Universal bidirectional serial data transmission interface and data transmission method thereof

A data transmission, universal serial bus technology, applied in the field of data transmission interface, can solve problems such as reducing transmission efficiency, increasing the difficulty of source data clock recovery or phase locking, etc.

Inactive Publication Date: 2008-07-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, although a fixed number of bytes of data can be transmitted in each frame of USB data, the data is not transmitted at its actual fixed rate, but at the inherent rate of the shared bus such as 480Mb / s burst transmission, which requires constant For MPEG TS streams transmitted at a constant speed, it is necessary to increase the buffer to smooth the data rate, thus increasing the difficulty of clock recovery or phase locking of the source data
In addition, because the USB interface adopts input and output transactions and table headers as well as fixed-rate frame structure and synchronization, identification field definitions, etc., when it is used to encapsulate and transmit data streams that require a specific synchronous MPEG TS packet structure, it will be due to data Packet structure mismatch reduces transmission efficiency

Method used

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  • Universal bidirectional serial data transmission interface and data transmission method thereof
  • Universal bidirectional serial data transmission interface and data transmission method thereof
  • Universal bidirectional serial data transmission interface and data transmission method thereof

Examples

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no. 1 example

[0055] Figure 6 It shows a structural block diagram of a digital television receiver with a UTI interface and digital television conditional access system modules according to the first embodiment of the present invention. As mentioned above, in order to ensure the interests of authorized users, conditional access technology is used in digital TV services, that is, digital TV signals for authorized users need to be scrambled before being sent out, and authorized users need to use their own authorized information Descramble the received signal to watch the desired program. In the present invention, in order to realize the machine-card separation scheme, the descrambling processing of MPEG TS is placed in a CA module 500 outside the digital TV receiver 400 to complete, and the digital TV receiver 400 and the CA module are realized through the UTI interface 10. MPEGTS transmission between modules 500 .

[0056] Such as Figure 6 As shown, both the digital television receiver ...

no. 2 example

[0074] Figure 13 A schematic structural diagram of a portable digital media recorder with the universal transmission interface of the present invention is shown.

[0075] Such as Figure 13 As shown, the portable digital media recorder with UTI 10 includes UTI 10 , digital media hard disk HDD 1310 , CPU control unit 1320 , CSS media stream encryption / decryption module 1330 , man-machine interface 1340 and other components.

[0076] In this embodiment, the portable digital media recorder is used as an external service module, and is connected to the device end (digital television receiver or set-top box or computer) through the UTI 10 . For example, when the digital media video recorder is in the recording mode, it is connected to the digital television receiver via the UTI 10, and receives the digital TS media stream to be stored (may include digital audio and video in formats such as MPEG-2, MPEG-4, MP3 and TS flow of data in other formats), after the CSS media stream encryp...

no. 3 example

[0078] Figure 14 A digital TV electronic program guide (EPG: Electronic Program Guide) system based on the UTI interface proposed by the embodiment of the present invention is shown. Such as Figure 14 As shown, the processing platform of the EPG system includes a digital television receiver 1400 configured with a UTI interface 10 and an EPG service processing module 1450 with a matching UTI interface. exist Figure 14 In this example, after receiving the MPEG TS data including EPG information via the tuner 1401 , the digital television receiver 1400 sends the MPEG TS data to the EPG service processing module 1450 via the UTI interface 10 .

[0079] After the EPG service processing module 1450 receives the MPEG TS containing EGP via the UTI interface 10, it is sent to the EPG extracting unit 1451 to filter the fields (Section) of the MPEG PSI and DVBSI data forms, or to extract the EPG broadcast MPEG TS of a specific PID The data packet (Packet). The EPG information extra...

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Abstract

A UTI (Universal Transport Interface) is provided in the invention, the UTI comprising a transceiving unit, configured to receive and transmit data which accords with USB (Universal Serial Bus) specification; a detecting unit, configured to detect the data received by the transceiving unit to determine whether to convert the received data into data which accords with a particular specification; and a conversion unit, configured to convert the received data into the data which accords with the particular specification when determining that the received data should be converted into the data which accords with the particular specification, and to convert the transmission data which accords with the particular specification into data which accords with the USB specification for transmission via the transceiving unit. With the UTI provided in the invention, service cards may be separated from devices for DTV and various value-added services may be provided.

Description

technical field [0001] The present invention relates to a data transmission interface, in particular to an interface for communication and data transmission between a digital signal processing main device (for example, a digital television receiver) and an external service module (for example, a digital television conditional access module) A universal serial bus (USB) interface, and a data transmission method thereof. Background technique [0002] With the advancement of digital multimedia, digital communication technology and digital video and audio broadcasting technology, the digital TV market has shown a strong momentum of development in countries all over the world. Compared with traditional analog TV, digital TV has the advantages of power saving, high spectrum utilization, good quality of received programs, and convenient service integration. In particular, digital TV can also provide interactive TV services, that is, users can order according to their own preference...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/00H04L12/24H04L29/02H04L29/06H04N5/00H04N7/24H04Q3/00
CPCH04N21/43607H04N21/43853H04L29/06068H04L69/08H04N21/4334H04N21/4263H04N21/47217H04N21/4349H04N21/4346H04N21/43632H04N21/4135H04N21/8166H04N21/4345H04N21/6433H04L69/18
Inventor 王兴军薛永林
Owner TSINGHUA UNIV
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