摘要:
A rangefinder apparatus includes an infrared light-emitting diode for projecting light toward a range-finding object; a position sensitive device for detecting projected light reflected from the range-finding object and outputting a signal according to a position at which the reflected light is detected; and arithmetic circuit for carrying out an arithmetic operation according to the signal from the photosensitive device and outputting a signal corresponding to a distance to the range-finding object; an integrating circuit for integrating the signal from the arithmetic circuit by repeatedly discharging an integrating capacitor with an integrating period in response to the signal from the arithmetic circuit, to output a signal corresponding to a result of the integration produced by charging the integrating capacitor; a CPU for detecting the distance to the range-finding object according to the signal from the integrating circuit; a battery for supplying a power source voltage; and a step-up regulator for raising the power source voltage of the battery through an oscillating action and outputting the raised voltage to the position sensitive device, arithmetic circuit, and the like, wherein the integrating period of the integrating circuit is prevented from being a constant period.
摘要:
An error correcting method decides the impossibility of error correction on the basis of only syndrome values and estimates a double error from only an operation expression B and, in a particular case where the impossibility of error correction cannot be decided based only on the syndrome values, decides the impossibility of error correction from the values of operation expressions, too.
摘要:
A compact camera has a built-in light-emitting display device which displays, as print information, a specific code. The specific code includes alphabetical characters when a print information set switch is operated. The device is alternatively allowed to display a six digit number. The alphabetical characters or number represents date information pertaining to exposure of a film frame, including a year, a month and a date. The print information appears as a visible image on developed film and is optically read by a photographic printer so as to automatically set the photographic printer to a printing condition determined by the print information.
摘要:
After one dimension of error detection and correction has been performed on a block of data, error correction in the other dimension may be selected to be either erasure-and-error correction or simply error correction. The selection is of erasure-and-error correction, which uses results of the error correction in the first dimension, when an indication of a burst error has been detected during the row error correction, or when the number of maximum error corrections within the row error correction is small enough, or when uncorrectable errors within the row error correction is small enough. Otherwise, error correction is selected.
摘要:
An error correction circuit is capable of performing correction errors in data at a high speed. A syndrome generator (2) calculates syndromes of RS codes based on partial data streams which are given from a data buffer (1). A received CRC generator (13) performs CRC coding on the partial data streams which are given from a data buffer (1) to thereby obtain received CRCs. An error pattern CRC generator (14) calculates error pattern CRCs of the respective partial data stream based on error patterns which are generated by an error pattern generation circuit (33). Under the control of a control circuit (40), the operations performed by the syndrome generator (2), the received CRC generator (13) and the error pattern CRC generator (14) are carried out at the same time. An improvement in the speed of error correction of the partial data streams performed by the error correction means directly leads to an improvement in the speed of the whole error correction.
摘要:
A distance measuring device of camera for measuring distance to a pictured object includes pulse-driven first, second and third beam projecting elements. When a distance to the pictured object is long and beams of the beam projecting elements reflected from the pictured object are small in quantity or become nil, the first beam projecting element is pulse-driven until the number of light emission reaches a predetermined first maximum number of light emission, and the second and third beam projecting elements are pulse-driven until the number of light emission reaches a predetermined second maximum number of light emission which is less than the predetermined first maximum number of light emission. Because of this, when a distance to the pictured object is long and the beam projecting elements are pulse-driven to the predetermined first or second maximum number of light emission, it is possible to shorten a distance measuring time.
摘要:
An error correction circuit has a parallel circuit of an RS code sequence circuit and a CRC coding sequence circuit to form a sequence circuit and a control circuit for selecting either one of them depending on the desired operation mode.
摘要:
Disclosed is a speech synthesizer integrated circuit as a preferred embodiment of the present invention, which is characterized in that;Using one chip LSI, it implements the fundamental controls for the speech synthesizing operations, for example, and fundamental controls for the key input and display operations (corresponding to the functions usually performed by any of the conventional microprocessors). The preferred embodiment of the present invention has made it possible to realize an extremely useful and versatile speech synthesizer integrated circuit by externally connecting a memory that stores the controlled programs and sound data available for synthesizing the intended speech. By allocating the same addresses to the internal and external memory storage areas, programs can be located at identical memory addresses, thereby increasing system efficiency.
摘要:
There is disclosed a one-chip speech synthesizer capable of providing synthesized human voices through a new and effective concept of LSI architecture. The synthesizer may execute all of the steps necessary for processing of sample data and enhances the processing speed through a new memory architecture by constructing the one-word length of a control memory (control ROM) longer than the one-word length of a data memory (data ROM). The synthesizer reproduces audible synthesized sounds merely by an added amplifier outside the one-chip LSI semiconductor device without the need to provide a digital-to-analog converter. The LSI device may be used with an expandable external memory as an extension of the data memory (data ROM) whenever a large number of words are to be processed.
摘要:
A high electrical resistance, superior formability aluminum alloy useful as structural materials used in structures suffering the action of high magnetic field, nuclear fusion reactor or the like, said aluminum alloy consisting essentially of, by weight, 1.0 to 8.0% of Mg, 0.05 to less than 1.0% of Li, at least one element selected from the group consisting of 0.05 to 0.20% of Ti, 0.05 to 0.40% of Cr, 0.05 to 0.30% of Zr, 0.05 to 0.35% of V, 0.05 to 0.30% of W and 0.05 to 2.0% of Mn, and the balance being aluminum and incidental impurities. Further, Bi in the range of 0.05 to 0.50 wt. % may be contained in said alloy.