摘要:
A rotary recording medium reproducing apparatus comprises a reproducing circuit for picking up and reproducing pre-recorded signals from a rotary recording medium on which digital recorded tracks and analog recorded tracks coexist, a first reproducing circuit for reproducing a composite video signal having a horizontal scanning frequency of a predetermined television system from signals which are reproduced from the analog recorded tracks, among reproduced signals from the reproducing circuit, a second reproducing circuit for demodulating and reproducing original information signals from signals which are reproduced from the digital recorded tracks, among the reproduced signals from the reproducing circuit, an oscillator circuit for generating a signal having a frequency which is a natural number multiple of the horizontal scanning frequency of the predetermined television system, a servo circuit for rotating a motor which rotates the rotary recording medium, in synchronism with the output signal of the oscillator circuit, and a master clock signal generating circuit for supplying to the second reproducing circuit a signal which is obtained by frequency-multiplying the output signal of the oscillator circuit, as a master clock signal.
摘要:
A recording and reproducing system records and reproduces signals on and from a disc, so that information signals including one of first and second system composite video signals are subjected to an analog modulation and recorded on analog recorded track turns on the disc, and digital signals made up of digital data or the like obtained by subjecting information signals to a digital modulation are recorded on digital recorded track turns on the disc. The digital signals are recorded on the digital recorded track turns on the disc with a predetermined transmission frequency, so that the digital signals are reproduced from the digital recorded track turns on the disc with an approximately constant transmission frequency when a first system disc recorded with the first system composite video signal is played on a reproducing apparatus primarily designed for playing a second system disc recorded with the second system composite video signal and when the second system disc is played on a reproducing apparatus primarily designed to play the first system disc.
摘要:
A digital video signal reproducing apparatus comprises a reproducing circuit for reproducing a digital video signal from a recording medium, which digital video signal is added with at least a write-in specifying code and a read-out specifying code for specifying a memory circuit part to picture element data groups which are obtained by subjecting a video signal to a digital pulse modulation, a detecting circuit for detecting the write-in specifying code and the read-out specifying code within a reproduced digital video signal from the reproducing circuit, a generator for generating various synchronizing signals and reference signals, first and second memory circuit parts each having a memory capacity for storing picture element data corresponding to one picture, a write controller for causing the picture element data to be written into one of the first and second memory circuit parts according to a value of the write-in specifying code, a latch circuit for latching the read-out specifying code by a vertical synchronizing signal generated from the generator, a read controller for causing stored picture element data to be successively read out from one of the first and second memory circuit parts according to a value of the read-out specifying code from the latch circuit, and a circuit for converting the picture element data read out from the first and second memory circuit parts to an analog video signal.
摘要:
A digital video signal transmitting apparatus comprises a memory which is written in with a digital video signal of selected picture elements selected from among all picture elements arranged in a matrix form constituting one picture frame, where the selected picture elements are arranged at zigzag positions along either a horizontal direction or a vertical direction in the matrix form arrangement, and a control circuit for carrying out read-out control to read out a digital video signal. The memory control circuit carries out the read-out control so that signals of the selected and written in picture elements are read out as they are from the memory, and signals of selected and written in picture elements near picture elements which were not selected and not written in are read out instead of signals of the picture elements which were not selected and not written in.
摘要:
A digital video signal recording system and reproducing apparatus comprise a circuit for independently subjecting a luminance signal and two kinds of color difference signals of a color picture information to digital pulse modulation, to produce a digital luminance signal and two kinds of digital color difference signals, a circuit for dividing the digital luminance signal and the two kinds of digital color difference signals into picture element data groups, in terms of specific number of rows or columns which are adjacent on a screen, and adding a header signal at least comprising a synchronizing signal, a picture mode identification code, and a picture information quantity identification code to a beginning position of each of the divided picture element data groups comprising the digital luminance signal and the two kinds of digital color difference signals, to produce a digital video signal having a signal format in which the digital luminance, the two kinds of digital color difference signals, and the header signal are time-sequentially multiplexed, a circuit for recording the digital video signal onto a recording medium, a circuit for writing each of the divided picture element data groups picked up and reproduced from the recording medium into a memory circuit according to codes within the header signal, and a circuit for producing an analog video signal in accordance with a standard television system from picture element data read out from the memory circuit.
摘要:
A jitter compensation system in a rotary recording medium reproducing apparatus having a reproducing transducer including a reproducing element for reproducing recorded signals from a rotary medium, where the rotary recording medium is recorded with an information signal and also recorded with reference signals for tracking control with predetermined periods, comprises a separation circuit for separating the reference signals from a signal reproduced by the reproducing transducer, a detection circuit for detecting the separated reference signals and obtaining a signal having a predetermined period and predetermined frequency, a standard signal supplying circuit for supplying a standard signal having a frequency equal to the predetermined frequency, a phase comparator for comparing phases of the predetermined frequency signal thus obtained and the standard signal supplied thereto, to produce a phase comparison error signal, and a displacing circuit for displacing the reproducing element of the reproducing transducer along a relative scanning direction with respect to the rotary recording medium, in response to the output error signal of the phase comparing means.
摘要:
A color video signal reproducing apparatus comprises a carrier chrominance signal separation circuit for separating a carrier chrominance signal from a color video signal reproduced from a recording medium, a luminance signal separation circuit for separating a luminance signal from the reproduced color video signal, a demodulating circuit for demodulating the separated carrier chrominance signal into two color difference signals, where the demodulating circuit consists of demodulators for demodulating the carrier chrominance signal into the two color difference signals, an oscillator for supplying a predetermined frequency signal to the demodulators, and a control circuit for controlling the oscillation frequency of the oscillator according to a jitter component in the carrier chrominance signal, a reference signal producing circuit for producing a reference signal having a predetermined frequency, a modulating circuit for modulating the reference signal from the reference signal producing circuit, respectively, by the color difference signals from the demodulating circuit, and a color video signal obtaining circuit for obtaining a color video signal by adding an output signal of the modulating circuit and the separated luminance signal.
摘要:
A rotary recording medium reproducing apparatus reproduces a rotary recording medium accommodated within a case, where the case comprises a jacket provided with a space for accommodating the rotary recording medium and an opening for allowing the rotary recording medium to go in and out of the jacket, and a lid member inserted through the opening of the jacket for closing the opening of the jacket. The rotary recording medium reproducing apparatus comprises a rotary recording medium supporting member for supporting the rotary recording medium left within the reproducing apparatus so that the rotary recording medium is supported above a turntable by an operation in which the case is inserted into and then extracted from the reproducing apparatus, a driving source for operating in one direction to raise the rotary recording medium supporting member and operating in a reverse direction to lower the rotary recording medium supporting member, and a control circuit for controlling the driving source to operate in the one direction when the control circuit detects the insertion of the jacket into the reproducing apparatus in a state where the rotary recording medium is supported by the supporting member and is being lowered with the supporting member operated by the driving source which is operating in the reverse direction.
摘要:
An apparatus reproduces signals which are recorded on a rotary medium having a main information signal recorded on a spiral main track, with first and second tracking control reference signals which are recorded on sub-tracks positioned between adjacent main tracks. A third tracking control reference signal is recorded on the main or sub-track, on each track turn, during an interval corresponding to the vertical synchronizing signal, within a vertical blanking period of the main information signal. The first and second reference signals are recorded within an interval excluding the interval corresponding to that of the vertical synchronizing signal. A kick pulse is generated for shifting the reproducing element to an adjacent track during a special reproduction mode so that the reproducing element is shifted at an interval other than the interval in which the reproducing element reproduces the vertical synchronizing signal.
摘要:
The present invention provides a novel and useful reproducing apparatus for reproducing a rotary recording medium recorded with a color video signal.Another and more specific object of the present invention is to provide a reproducing apparatus capable of reproducing any one of the NTSC disc, the PAL disc, or the SECAM disc so that a reproduced picture is obtained in a receiver of any of the three systems, that is, the NTSC system, the PAL system, or the SECAM system. According to the apparatus of the present invention, an arbitrary disc can be reproduced regardless of the color video signal system, and a reproduced picture can be obtained by an arbitrary receiver regardless of the system it uses.