摘要:
A Fourier transform circuit in a receiver performs a Fourier transform on a orthogonal frequency division multiplexing signal received through a transmission channel for each symbol to sequentially reproduce a received reference vector sequence and a received vector sequence. An interleave circuit interleaves elements of the received reference vector sequence and the received vector sequence. A memory stores the received reference vector sequence. A vector modulation circuit modulates the received reference vector sequence by respective signal point vectors representing each signal point to generate a modulation vector sequence for each symbol. A metric generation circuit then obtains a difference between the received vector sequence and the modulation vector sequence to generate the difference as a branch metric sequence. A trellis decode circuit reproduces a data sequence on the basis of the branch metric sequence.
摘要:
A still image filing system in which the data compressed by a compressor for data recording is supplied to a reconstructing device prior to recording to a recording medium and reconstruction still image data is generated from the reconstructing device. Before the non-compression still image data is compressed and recorded to the recording medium, consequently, a still video image by the compressed data can be easily checked.
摘要:
There is provided an apparatus of inspecting a packaged state by scanning a packaged printed circuit board with a fine light beam and detecting reflection beams of the fine light beam in a plurality of directions. A fine light beam emitted from a light source is scanned on the packaged printed circuit board substantially vertically thereto by means of a polygon mirror and a light projection f.theta. lens. An optical path correcting system receives reflection beams scattered from the packaged printed circuit board and corrects optical paths of the reflection beams. The correction is done in such a way that reflection beams having constant directional vectors regardless of the change of the scanning position of the fine light beam are received and guided to light receiving positions complying with a height at a scanning position on a plurality of photoelectric conversion devices. Through this, the packaged state of parts is inspected at a high speed, with high accuracy and over a wide range without expanding the light receiving area of the photoelectric conversion device and without causing characteristics of triogonometrical survey to change with the scanning position.
摘要:
Encoding and decoding devices which are capable of increasing the encoding and decoding speed. In arithmetic encoding, there is a possibility of encoding with high efficiency which is very close to the entropy of the information source, but the encoding and decoding time is generally longer than that in another encoding systems such as an MMR encoding system. For example, in a standard facsimile equipment, about 1.3 sec is required for encoding the picture information in an A4-size copy. In prediction encoding, a memory for storing the past reference symbols and the predicted values therefor is necessary for prediction. Since the memory capacity is generally large, a large-capacity RAM is used. The encoding time is therefore greatly dependent on the access speed of the RAM. In the present invention, a high-speed register for storing the predicted value for a special symbol pattern is provided separately from the RAM so that the predicted value of the special symbol pattern is read from this register, thereby enabling high-speed encoding.
摘要:
A coding method of a binary Markov information source comprises the steps of providing a range on a number line from 0 to 1 which corresponds to an output symbol sequence from the information source, and performing data compression by binary expressing the position information on the number line corresponding to the output symbol sequence. The present method further includes the steps of providing a normalization number line to keep a desired calculation accuracy by expanding a range of the number line which includes a mapping range, by means of a multiple of a power of 2, when the mapping range becomes below 0.5 of the range of the number line; allocating a predetermined mapping range on the normalization number line for less probable symbols LPS proportional to its normal occurrence probability; allocating the remaining mapping range on the normalization number line for more probable symbols MPS; and reassigning the predetermined mapping range to the remaining mapping range the half of a portion where the allocated remaining range is less than 0.5, when the allocated remaining range becomes below 0.5.
摘要:
An electrophotographic photosensitive member having the structure comprising a conductive substrate laminated thereon with (i) a charge generation layer comprising two or more kinds of charge-generating materials incorporated in binder resins and (ii) a charge transport layer, wherein said charge generation layer comprises at least a first charge generating material dispersed in a first binder resin and a second charge generating material dispersed in a second binder resin, such that the binder resins in the charge generating layer are incompatible with each other.
摘要:
A method for the preparation of an illuminance-correcting light transmitting filter employed in an exposure device adapted for the preparation of the phosphor screen of the color cathode ray tube. The laser light modulated with a light modulator is radiated to the surface of the filter base plate on which a thin layer of the recording material is previously formed. A pattern of through-holes of variable size or density is formed as the thin layer is vaporized so that the light transmitting filter may be prepared with high accuracy and in a shorter time. The laser light is modified with the light modulator, and the filter base plate is securely mounted to a movable stage, the movement of which in the X- and Y- directions is controlled under the commands of a computer unit.
摘要:
An electrophotographic photosensitive member having a photosensitive layer on an electroconductive substrate comprises a surface layer containing a fluorine type resin powder and a fluorine type graft polymer.
摘要:
A cleaning device for removing any residual on an image bearing member has a cleaning member held in pressure contact with the surface of the image bearing member, and means for detecting the pressure contact condition of the cleaning member.
摘要:
One embodiment of the present invention is a semiconductor device which includes a gate electrode; a gate insulating film formed to cover the gate electrode; a semiconductor layer formed over the gate insulating film and placed above the gate electrode; a second insulating film formed over the semiconductor layer; a first insulating film formed over a top surface and a side surface of the second insulating film, a side surface of the semiconductor layer, and the gate insulating film; silicon layers and which are formed over the first insulating film and electrically connected to the semiconductor layer; and a source electrode and a drain electrode which are formed over the silicon layers. The source electrode and the drain electrode are electrically separated from each other over the first insulating film. The semiconductor layer is not in contact with each of the source electrode and the drain electrode.