摘要:
A sampled-value code processing device in which, from the sampled-value code series input at a predetermined period, a first code series consisting of codes related to a group of sampled values determined according to a prescribed rule and a second code series consisting of codes related to sampled values other than the group of sampled values are each produced at a period longer than the predetermined period, and a filtering process for the first code series is performed by using the second code series.
摘要:
Method and apparatus for recording information on a card-shaped optical information recording medium with a light beam and/or for reproducing information recorded on the medium. The apparatus includes a device for irradiating the medium with a light beam, a device for causing relative reciprocal movement between the medium and the light beam, and a device for terminating or displacing the light beam on the medium, after the lapse of a predetermined period of time from a moment when the relative speed of the medium and the light beam is reduced below a predetermined speed. The method includes the steps carried out by the apparatus.
摘要:
A system in which content usage conditions can be upgraded without the need for a service provider to control content-usage rights of a user. In the system in which encrypted content is distributed and is allowed to be utilized only by authorized users, the service provider receives a content usage-right certificate from the user, and on the condition that it is determined that data is not tampered with by verifying a digital signature of an issuing entity of the content usage-right certificate, the service provider obtains user information and content purchase information of the user from the content usage-right certificate, and performs upgrade processing by, for example, changing the usage conditions. It is thus possible to change the content usage conditions without the need for the service provider to possess usage control data.
摘要:
A device for multiplexing multi-channel data includes a reference frequency generator 2 as clock generation means for generating a master clock, a multiplexing section 31 as multiplexing means for multiplexing a plurality of data into a packet, and a TSPP (transport stream packet pump) board 4 having a buffer memory 42 as storage means for storing the packet sent from the multiplexing section 31, so that a continuous packet stream is outputted on the basis of the master clock.
摘要:
An image processing apparatus separates input image data into low resolution image data and one or more auxiliary image data for interpolating the low resolution image data, and decrypts at least one of the separated auxiliary image data. The image processing apparatus also separates input image data into low resolution image data and at least one auxiliary image data for interpolating the low resolution image data and decodes the image data with at least one of the auxiliary image data being encrypted, and decrypts the encrypted auxiliary image data and synthesizes the low resolution image data with the auxiliary image data.
摘要:
In a digital video signal recording apparatus of the kind arranged to output a coded signal with its length per picture arranged to be variable by compressing the amount of information of the digital video signal and to record the coded signal while forming many tracks in parallel on a tape-shaped recording medium, a compression ratio is adjusted in such a way as to make the coded signal corresponding to m pictures (m: an integer of 2 or more) have an amount of information recordable in n tracks (n: an integer of 1 or more).
摘要:
In this image coding method and apparatus, an image is divided into a plurality of areas. Information indicative of the image is variable length coded into data of, for instance (138.times.132) symbols. Boundary information corresponding to the area is transmitted after the data for each 128 symbols, after being variable length coded.
摘要:
The information signal transmission system of the present invention is so designed as to convert the analog information signal into digital information data and to transmit these digital data after enciphering a part of the digital data. It can therefore maintain the secrecy of the transmitted information signal and can employ a low-speed enciphering process, thereby reducing the magnitude of hardware and reducing its cost.
摘要:
A coding apparatus includes a blocking unit for gathering and blocking sample values of input signals, an orthogonal-transforming unit for orthogonal-transforming the blocked input signals, a transforming unit for constructing a one-dimensionally arraying block by combining orthogonal-transformed blocks and for arranging the data in the one-dimensionally arraying block in a one-dimensional array, and a coding unit for coding the data of the one-dimensional array from the transforming unit.
摘要:
In an image encoding apparatus, conversion data obtained by converting image information onto a frequency region, and corresponding to several frames are parallelly output using a one-frame-period delay circuit. The parallelly output conversion data are quantized by a quantization circuit, and a data amount to be obtained when the quantized data are encoded is obtained by a variable-length coding circuit. The data amount information is input to a coefficient operation circuit for determining a quantization step of the next stage. Conversion data quantized according to an output from the coefficient operation circuit are encoded, and the encoded data are output.