Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
1997-06-13
2001-05-29
Kelley, Chris (Department: 2613)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C386S349000
Reexamination Certificate
active
06240138
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a data transmitting apparatus (data transmitting system) which performs compression or other predetermined processing on audio and/or video data etc. at a transmitting side and receives and reproduces the transmitted data at the reception side, more particularly, the present invention relates to a data transmitting apparatus which is able to efficiently transmit data audio and/or video data etc. as data for variable speed reproduction at the reception side from the transmitting side to the reception side.
BACKGROUND ART
As a signal transmission system for transmitting audio and/or video data (hereinafter simply referred to as AV data) of a digital format between apparatuses used for video editing etc., a serial digital interface (SDI) system has been used. The signal format of the SDI system has been standardized as SMPTE-295M of the SMPTE (Society of Motion Picture and Television Engineers) as a standard of video signals and audio signals of a digital format.
The SDI system is used in the transmission of the AV data of a digital format of the D1 system, that is, a component video format, and D2 system, that is, a composite video system. The transmission speed thereof is as high as 270 MHz.
In the SDI system, however, the limitation is set that the signal which can be transmitted is only one channel's worth of noncompressed AV data and only eight channels' worth of the audio signal of the base band. At the present time, the SDI system is not necessarily suitable for meeting the demands for multi-media or multi-channels which are now being raised in the field of broadcasting or video editing.
Therefore, recently an SDDI (serial digital data interface) system has been proposed by the Sony Corporation which can transmit a plurality of series of noncompressed AV data, AV data compressed by inter-frame predictive encoding, etc. or computer data and can use the transmission equipment of the conventionally used SDI system to transmit the data.
In a television broadcasting station etc., video equipment such as VTRs and video editing devices used for the editing of videos are connected by a router device etc. AV data of the SDDI system transmitted from any apparatus can be input to any other apparatus via the router device.
In a system in which a large number of video equipment are connected via such a router device (AV server system), there are cases where it is desirable to perform variable speed reproduction changing the speed of reproduction of the AV data at the time of reproduction.
Where such variable speed reproduction is carried out, it is necessary to transmit data indicating the method of reproduction of the AV data from the transmission side of the AV data to the reception side.
For example, where it is intended to make the video equipment on the reception side perform variable speed reproduction for compressed AV data, it is necessary to transfer from the video equipment on the transmission side to the video equipment on the reception side control data concerning the writing control at the time of writing of the AV data after the compressed AV data is subjected to expansion and decoding in the frame memory and concerning the reading control at the time of reading the stored AV data from the frame memory.
However, when the reproduction data indicating the method of reproducing the transmitted AV data such as the transmission data, for example, the AV data, the control data concerning the frame memory, etc. are separately transmitted, there arises a problem in that different equipment become necessary for the transmission of the transmission data and the reproduction data.
Also, when the transmission data and the reproduction data are transmitted via different equipment, there arises a problem that it becomes difficult to establish synchronization between the transmission data and the reproduction data.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a data transmitting apparatus which can transmit AV data or other transmission data covered by the transmission and reproduction-use data showing the method of reproduction of the transmitted data, for example, variable speed reproduction, included in the same transmission packet.
Another object of the present invention is to provide a data transmitting apparatus which enables the transmission of the transmission data and the reproduction-use data included in the same transmission packet to enable transmission of these data using the same equipment.
A still other object of the present invention is to provide a data transmitting apparatus which enables the transmission of the transmission data and the reproduction-use included in the same transmission packet to enable easy establishment of synchronization among these data.
The data transmitting apparatus according to the present invention is a data transmitting apparatus which uses a transmission packet having a control portion including at least data for transmission control and a data portion including the transmission data which becomes the object of the transmission to transmit the transmission data from a transmitting apparatus to a receiving apparatus. The transmission apparatus has a reproduction-use data generating means for generating reproduction-use data indicating the method of reproducing the transmission data, a data storing means for storing the reproduction-use data and the transmission data in the transmission packet, and a transmitting means for transmitting the transmission packet storing the reproduction-use data and the transmission data to the receiving apparatus. The receiving apparatus has a receiving means for receiving the transmission packet transmitted by the transmitting apparatus, a data separating means for separating the reproduction-use data and the transmission data from the received transmission packet, and a data reproducing means for reproducing the transmission data based on the reproduction-use data.
For the transmission data, audio and/or video data is suitable.
The data reproducing means of the receiving apparatus has a memory controlling means and a memory means for storing the transmission data separated by the data separating means and outputting the stored transmission data according to the control of the memory controlling means. The reproduction-use data generating means of the transmitting apparatus generates the reproduction-use data indicating the storage region of the memory means in which the transmission data is stored and the storage region of the transmission data to be output from the memory means. The memory controlling means of the data reproducing means of the receiving apparatus sequentially stores the transmission data separated by the data separating means in the storage region of the memory means indicated by the reproduction-use data separated by the data separating means and outputs the transmission data stored in the storage region of the memory means indicated by the reproduction-use data separated by the data separating means.
The data transmitting apparatus according to the present invention is a data transmitting apparatus which transmits transmission data from a transmitting apparatus to a receiving apparatus by using a transmission packet of the SDDI system, that is, a transmission packet having a control portion including the data for the transmission control (ancillary data portion: ANC) and a data portion including the transmission data which is the object of the transmission (payload portion: PAD portion). Here, the data for the transmission control means the horizontal (H) sync, vertical (V) sync, frame sync, and other synchronization signals.
In the transmitting apparatus of the data transmitting apparatus according to the present invention, the reproduction-use data generating means generates the reproduction-use data indicating in which storage region of the frame memory of the receiving apparatus should the transmission data be stored and the transmission data stored in which storage region of the frame memory sh
Kamiyama Kazuo
Koishikawa Yoshinori
Frommer William S.
Frommer & Lawrence & Haug LLP
Kelley Chris
Philippe Gims
Simon Darren M.
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