摘要:
A digital signal reproducing apparatus reproduces coded digital signal data which have been recorded on a magnetic tape. The digital signal reproducing apparatus includes first and second decoders. These decoders perform the error correction and erasure correction. The second decoder has a higher error detection capability than that of the first decoder. The reproducing apparatus further includes a checking circuit for checking code errors contained in the coded digital signal data. When the code errors detected by the checking circuit may occur simultaneously, a first editing-point detection signal is produced. When the first editing-point detection signal is output, a judgement is done that the editing-point may exist in the digital signal data, and the first decoder is changed to the second decoder for a predetermined time period. When the second decoder detects correction-prohibited data portion, a second editing-point detection signal. Upon receipt of the second editing-point detection signal, the cross-fade process is carried out for the digital signal data by an editing processor.
摘要:
A decoder for decoding a code C which is two-stage encoded by a C.sub.1 code ((N, K, D) Q dimensional code) and a C.sub.2 code ((n, k, d) q dimensional code), which includes: a C.sub.1 decoder including an error correction means for conducting an error correction of the errors below the number [(D-1)/2] to output the decoded word, and a weight generator which generates wj (j=1, 2, . . . , n) when i (i=0 to [(D-1)/2 ]) errors are corrected and an error detection (correction disability) is judged; a C.sub.2 decoder for decoding the C.sub.2 code including a forfeiture error correction means for judging the position j of the wj among the weight vector w in the received word r which is obtained in accordance with the decoded word output from the C.sub.1 decoder, and conducting a forfeiture error decoding. A weighted distance calculating means for calculating the weighted distance .rho..sup.(k) between the decoded word r.sup.(k) and the received word r when a decoded word in each of K=0, 1, . . . , [(D-1)/2] is obtained; the C.sub.2 decoder also including a comparator for comparing the weighted distance .rho..sup.(k) and the integer .tau., outputs the decoded word r.sup.(k) as a correct decoded word when the .rho..sup.(k) is smaller than or equal to .tau., and the correction disability signal when the .rho..sup.(k) is larger than .tau. or no decoded word is obtained by the forfeiture error correction means.
摘要:
This repair device includes a casing, a slide shaft slidably arranged with respect to the casing, a turn table rotatably arranged with respect to the slide shaft, and a cutting mechanism installed on the turn table and including cutting tools. The turn table is rotationally displaced while the slide shaft slides in an axial direction, so that the cutting tools helically turn to cut an inner periphery of a nozzle. The cutting mechanism includes a cutting-tool switching unit that switches the cutting tools.
摘要:
Disclosed is a nozzle stub working system for a reactor vessel that performs work inside a nozzle stub of the reactor vessel, the nozzle stub working system for the reactor vessel including: a platform unit that is provided at an upper portion inside the reactor vessel and includes a substantially cylindrical side wall portion and a bottom portion blocking the lower end of the side wall portion; an access window that is provided at the side wall portion of the platform unit to allow the inside of the platform unit to communicate with the nozzle stub; an access window moving device that opens and closes the access window; a working device that advances from the inside of the platform unit to the inside of the nozzle stub to perform work inside the nozzle stub; and a control device that is provided at the outside of the reactor vessel and controls the access window moving device and the working device, wherein the control device drives the access window moving device to open the access window, drives the working device to perform work inside the nozzle stub, and then drives the access window moving device to close the access window after the performance of the work.
摘要:
An opening and closing device that opens and closes an access port opened from a substantially cylindrical working platform disposed inside a reactor vessel and used to access a nozzle stub of the reactor vessel from the inside of the working platform, the opening and closing device includes: a cover that is slidable along an outer peripheral surface or an inner peripheral surface of the working platform from a closing position where the access port is closed to an opening position where the access port is opened; and moving device for sliding the cover.
摘要:
In a high-efficiency encoder which performs motion-compensation prediction, an intra-field is set every n fields. The presence of a scene change is detected. When a scene change occurs, a reference picture of motion-compensation prediction is switched, or the field immediately after the scene change is set as an intra-field.
摘要:
In a high-efficiency encoder which performs motion-compensation prediction, an intra-field is set every n fields. The presence of a scene change is detected. When a scene change occurs, a reference picture of motion-compensation prediction is switched, or the field immediately after the scene change is set as an intra-field.
摘要:
In a high-efficiency encoder which performs motion-compensation prediction, an intra-field is set every n fields. The presence of a scene change is detected. When a scene change occurs, a reference picture of motion-compensation prediction is switched, or the field immediately after the scene change is set as an intra-field.
摘要:
In a digital VTR having a certain recording bit rate, within a range not higher than a remaining data rate after recording the bit stream, first HP data D1 is recorded in first specific regions, and second HP data D2 is recorded in second specific regions in specific tracks. In middle-speed and high-speed fast replay, the magnetic tape is transported continuously at a middle-speed or high-speed higher than the standard speed for normal replay, and the first HP data D1 is used in common, and at a low-speed fast replay of about twice the normal speed, the speed of the magnetic tape is alternated between a speed near the standard speed for normal replay, and a speed near the low-speed fast, and at the speed near the standard speed, the second HP data disposed in the second specific regions in the specific tracks and the first HP data disposed in the first specific regions in the specific tracks are both replayed.
摘要:
A digital signal recording and reproducing method and apparatus for digitally recording and reproducing first and second signals in tracks on a magnetic recording includes an encoder and a recording unit. The encoder separately error-correcting encodes the first and second signals of a first and second type, respectively, to produce at least first and second inspection codes corresponding to the first and second signals. The first and second inspection codes have first and second lengths, respectively. The recording unit records the first and second signals and the first and second inspection codes in tracks of the magnetic recording medium so that the first and second signals and the first and second inspection codes are recorded in a track without a gap therebetween.