摘要:
A modular system that includes a plurality of modular elements that can be coupled together in a hidden manner with respect to the visible side. The modules are formed as areal, frame-like or three-dimensional shaped parts and are freely combinable with one another. At least substantially flat modular elements or flat modular element regions have a plurality of mutually spaced apart coupling and fixing members that project beyond a boundary edge of the module. Insert grooves are provided at a rear side of the module for the shape-locked and force-transmitting reception of coupling and fixing members of adjacent modules.
摘要:
In playback scanning of oblique tracks the jumps of velocity errors in the transition from one head to another are found to be substantially constant, but the magnitude of the velocity error as a whole is subject to statistical fluctuation and the like. Within a track a velocity error determined for one line is used for correction in the following line, while for the first line the magnitude of a jump from a previous magnetic head changeover in the same sense is utilized. With the help of a value from the last line or next-to-last line of the earlier track, a correction value is provided for the first line of the after next track. A ramp signal is inserted in each horizontal blanking interval ahead of the color synchronization signals, raising the latter to the top of the ramp level. The inserted signals are digitized along with the video signal. Samples of the digital ramp signal which pass through a magnitude window (70-73), which is set for passage of not more than two samples in a narrow range symmetrical with respect to the ramp midpoint, address a PROM which converts those magnitudes into timing error values of the pulse generator which provides sampling rate pulses for the converter that digitizes the video signal. The timing error values are used to correct the phase of that pulse generator.
摘要:
The rotary headwheel device for scanning oblique tracks on an advancing magnetic tape is provided with normal playback heads which follow the recording heads and trace the path of the same oblique tracks and also with auxiliary playback heads which trace the path of the respective tracks which the normal playback heads trace but do so 6 and 1/2 revolutions in advance. In order to improve display of the content of recorded digital television signals in a slowed down or accelerated motion mode, the auxiliary playback heads are shifted axially to offset them by a half track width from their position useful for audio processing, whenever the magnetic tape playback speed is off-normal. At such times the outputs of the several normal playback heads are evaluated as to error rate and if any of these outputs exceeds a reference error rate, a switchover unit on the rotary scanning device switches the rotary transformers, which carry the playback outputs to processing channels, from the normal playback heads to the auxiliary playback heads. The error rates are then measured and evaluated for the auxiliary playback heads, and when one of them shows an error rate exceeding the reference error rate, the rotary transformers are switched back to the normal playback heads and so on. The mechanical shift of the relative offset between auxiliary playback heads and normal playback heads is made and maintained electromagnetically for the duraton of off-normal tape speed operation in playback.
摘要:
The head wheel of a video recorder-reproducer is equipped with a set of four advanced read heads, in addition to the usual sets of four read and write heads, so that each advanced read head can read the contents of an oblique track on a magnetic tape on which one of the write heads will be able to record thereafter and which will be read still later by one of the normal read heads. The advanced read heads are so located that while one of them is reading a track, one of the normal read heads is out of contact with the tape. The advanced read heads are used for reading out audio sections of video tape tracks for processing and rerecording in accordance with a previously known processing procedure used in editing newly recorded video tapes for better audio recording. The normal read heads are available for an after-check of the rerecorded audio. A switching system timed by the rotation of the head wheel disconnects each of the normal read heads in a sequence during the periods in which they are respectively out of contact with the tape and at the same time the switches in one of the advanced read heads for scanning the mid-portion of the recorded tracks where the audio sections of the recording are located.
摘要:
A color television signal processor for signals reproduced from magnetic tape converts the signals to digital form at a sampling rate substantially equal to three times the color carrier frequency, incorporates a timing system that locks the sampling rate into step with the picked up synchronizing signals in which a digital pulse generator of high stability is utilized having other possible applications, an additional demodulator separately switched is used to recover synchronizing signals for the first line of each segment, a ramp signal is provided during the blanking interval to assist in accurate timing of the sampling pulses, velocity errors are corrected for each line by a measurement of the period of a previous line and discontinuities (jumps in alternating directions) related to the switching between heads are also measured and compensated for. A more economical scheme for dealing with signal dropouts makes use of a digital low-pass filter for separating luminance and chrominance signals for dropout compensation that can be left in circuit without deterioration of picture quality during periods in which no dropouts are detected.
摘要:
Successive groups of television lines of a first field of a television frame have the luminance information recorded on a first oblique track and the chrominance information recorded on the next, whereas in the second field of the frame, the chrominance information is recorded on the first and the luminance information on the next track of each successive pair of tracks. Audio information is recorded in four segments of each of two channels, with two segments (one from each channel) preceding the video information and two more following it on each track with spacing by recording-free gaps (G). This arrangement maximizes the effect of covering or correcting transient or longer duration failures resulting from defects in the tape or irregular incidence or blockage of a magnetic head.
摘要:
Sudden changes in loudness of the sound signal between successive television scenes are avoided by substituting faded transitions between the sound signals of successive scenes instead of simple abutment of sound signal sequences one behind the other. This is produced, in a system in which the sound signals are digitally encoded, by distributing digital sound signal samples individually or by pairs to two recording channels in alternation and providing the transitions from the sound signals of one scene to the sound signal of the next scene earlier in one channel than in the other, by about 10 milliseconds. During that time span, one signal is faded out and the other is faded in by digital filtering or multiplication. It is convenient to provide such a reciprocal fading operation for the sound signals between each picture field or at least between each picture frame. During the reciprocal fading intervals, the sound signal samples of each sequence may be filled in with interpolated sample values inserted at the same time that a sample value of the other sequence is provided in the other channel. The provision of continuous forming of interpolated values can be used for substitution of interpolated values for sample values of a signal that has dropped out or been subjected to errors by disturbances.
摘要:
A color television signal is divided into a luminance signal component Y and two color difference signal components R--Y and B--Y. In differential pulse code modulation for transmission and demodulation after reception, the color difference signals are coded and decoded in a time multiplex mode respectively by a single coder and a single decoder.
摘要:
A method of recording signals on a magnetic medium, in which a first magnetic head (1) blanks a wide track by recording signals at a first azimuth angle and a second magnetic head (2) records a narrower signal track (15) by recording signals at a second, differing azimuth angle. This permits feeding the same current or signal through the head windings (8,9) of both heads, thereby economizing on driving circuitry (10). Due to the differing azimuth angles, the reading head does not pick up any significant amount of noise from the border regions defined between the edges of the signal track and the wider blanking track. The width of the signal track and the widths of the border regions sum to equal the width of the blanking track.
摘要:
In a video signal processor incorporating a reference clock pulse generator of highly precise frequency, two pulse generators, one preceding the drop-out corrector circuit which includes a picture memory and another following the drop-out corrector, are controlled in phase and frequency periodically in response to a horizontal synchronizing pulse. An addition circuit (101) the output of which is intermediately stored in a 20 place register (105) has a data input (104) to which bits of higher binary significance, for phase control, are supplied in response to the synchronizing pulse and thereafter bits of lower binary digit significance are supplied by a velocity error detection circuit for frequency control during the remainder of a television line interval. The output of the 20 place register is fed back to another input of the addition circuit, to produce a sawtooth wave resulting from the overflow of the addition circuit, which is a submultiple of the reference clock pulse generator frequency. A PROM, responsive to the 10 most significant output bits of the addition circuit, and subsequent processing circuits (114,118, 115) convert the sawtooth wave to an analog sinusoidal wave which is then frequency multiplied to a frequency approximating the frequency of the reference clock pulse generator.