摘要:
The problem to be solved is that once copyright claimed AV data is passed to application software, the application software can freely process the AV data for recording, etc., defeating the purpose of copyright protection. The invention provides a computer which comprises a system section 12 and an application software section 13, and which takes in copyright claimed, encrypted data via a digital interface 1 for processing therein, wherein the system section 12 judges that the application software section 13 is legitimate application software for the protection of copyright, and if the application software is a legitimate one, the system section 12 passes a key for the encrypted data to the application software section 13.
摘要:
A recording and reproducing apparatus is characterized in that said apparatus has: inputting means for receiving a packet data which is based on IEEE 1394, and in which signal information for indicating copy right information of an AV data (hereinafter, referred to as EMI) is provided in a header of a packet according to IEEE 1394; and recording and reproducing means for recording and reproducing an AV data and the EMI which are held in the packet data received by said inputting means. Four kinds of EMI are used, and, when an AV data indicating allowance “copy one generation” among them is to be recorded, said recording and reproducing means performs recording while rewriting the EMI to EMI indicating “no more copy.”
摘要:
A multichannel display data generating apparatus for generating data for displaying AV data on a multiscreen has a plurality of screens for displaying AV data of a plurality of channels, said apparatus comprising: input means for inputting AV data of a plurality of channels being transferred using a transport packet of a transport stream; a smaller number of PCR extracting means for extracting in a time-sharing mode the PCR of a plurality of channels displayed on said plurality of screens than the number of said plurality of screens; the same number of PLL means for establishing PLL synchronization by using said extracted PCR as the number of said plurality of screens; the same number of STC (system time clock) counter means for counting the times of the channels displayed on said plurality of screens by using the oscillation frequency of said PLL means as the number of said plurality of screens; AV decoding means for AV-decoding the AV data of the channels displayed on said multiscreen in AV synchronization with said STC counter means; and output means for outputting said AV-decoded AV data; and wherein said output AV data is displayed on said multiscreen.
摘要:
A multichannel display data generating apparatus for generating data for displaying AV data on a multiscreen has a plurality of screens for displaying AV data of a plurality of channels, said apparatus comprising: input means for inputting AV data of a plurality of channels being transferred using a transport packet of a transport stream; a smaller number of PCR extracting means for extracting in a time-sharing mode the PCR of a plurality of channels displayed on said plurality of screens than the number of said plurality of screens; the same number of PLL means for establishing PLL synchronization by using said extracted PCR as the number of said plurality of screens; the same number of STC (system time clock) counter means for counting the times of the channels displayed on said plurality of screens by using the oscillation frequency of said PLL means as the number of said plurality of screens; AV decoding means for AV-decoding the AV data of the channels displayed on said multiscreen in AV synchronization with said STC counter means; and output means for outputting said AV-decoded AV data; and wherein said output AV data is displayed on said multiscreen.
摘要:
A multichannel display data generating apparatus displays AV data on a plurality of screens. A channel displayed on one of the screens is displayed without a program clock reference.
摘要:
A reproduced image transmission apparatus which can display reversely reproduced images normally even when the transfer order of asynchronous transfer and isochronous transfer is not ensured on IEEE1394, in cases where an apparatus for generating the reversely reproduced images and an apparatus for decoding the reversely reproducing images are connected with each other via an IEEE1394 network. An MPEG transport stream processing means 15 embeds control signal for controlling decoding in an MPEG picture, and transmits the signal together with the MPEG picture through the IEEE1394 network in the isochronous transfer mode, whereby the synchronization between the MPEG picture and its control signal is surely obtained, thereby to generate reversely reproduced images according to MPEG using P and B pictures.
摘要:
In the data processing apparatus and file management method therefor of the present invention, when each piece of data in one of plural blocks is recorded as a data portion on a disk medium, continuous ID numbers are assigned to the individual continuous blocks, each of the assigned ID numbers is stored in the ID portion of sub-code portion, address information indicating the recording position of the head of at least the next block is stored in the link portion of the sub-code portion, and the sub-code portion is recorded together with the data portion of the block on the disk medium.
摘要:
A virtual RAM read address generating circuit (41) generates a virtual address on the basis of an output signal of a crystal oscillation circuit (36). A phase comparison circuit (39) which performs phase comparison with a write address, and a spindle control circuit (3) which controls rotation of a disk with reference to outputs of a frequency comparison circuit (38) and the phase comparison circuit (39) are disposed. Therefore, a phase error can be fed back to a spindle motor, thereby preventing linear velocity deviation from occurring in a steady state. By using the thus configured reproducing device, the reproduction quality in the case where a disk wherein recording was performed by the CLV system is reproduced by the variable linear velocity reproduction system is ensured, and both high-speed access and low power consumption are realized.
摘要:
The present invention provides the following rotation control method for reducing energy consumption of a motor driving a disk. In a constant speed mode, a supply voltage V1 for driving the motor at a constant speed N1 is selected; however, at a lower constant speed N2, a supply voltage V2 lower than V1 is selected. In an acceleration mode for accelerating the motor speed from N2 to N1, a higher supply voltage than V1 is selected just before starting acceleration, and then V1 is selected after the acceleration. In a speed deceleration mode for decelerating the motor speed from N1 to N2, a lower supply voltage than V1 is selected just before starting deceleration, then the supply voltage V2 is selected after the decleration.
摘要:
A video/audio processing device, such as a DVD recorder, includes a controller for controlling a state of power-on/off. The controller has a first standby mode and a second standby mode having power consumption larger than that of the first standby mode in a power-off state of the video/audio processing device. The first standby mode is a mode for maintaining a power of the video/audio processing device in the “off” state. The second standby mode is a mode for maintaining the power of the video/audio processing device in an apparent “off” state. The controller switches between the first standby mode and the second standby mode in conjunction with a state of power-on/off of external equipment such as television.