摘要:
A rotary recording medium has information signals recorded on a spiral or concentric tracks formed thereon as variations in geometrical configuration. The tracks comprise a mixture of digital recorded tracks which are recorded with a first modulated signal and analog recorded tracks which are recorded with a second modulated signal. The first modulated signal is a digital signal which has been time-sequentially multiplexed in terms of blocks at a transmission frequency of 44.1 kHz or a frequency extremely close to 44.1 kHz and has then been subjected to a modulation, where each of the blocks are constituted by a synchronizing signal, error correcting codes, and an error detecting code, which are added to a plurality of channels of digital data which are digitally modulated information signals. The second modulated signal is an analog modulated analog information signal at least including a composite video signal. A number of blocks recorded in one track turn of the digital recorded tracks is approximately equal to a product of the transmission frequency and a duration of one revolution of the rotary recording medium.
摘要:
A digital data transmitting system comprises a first circuit for transmitting digital data related to an information signal data in terms of sectors each having k words with respect to each channel, where k is a natural number. The transmission of the digital data is performed within a predetermined transmission time period once or a plurality of times according to a tolerance of data error rate for an information content of the digital data. The information signal data are among digital data related to a plurality of channels of information signals which are subjected to a digital modulation, and the plurality of channels of information signals are made up of a combination at least including the information signal data among three kinds of information signals. The three kinds of information signals are a non-compressed audio signal, a video signal, and the information signal data other than the non-compressed audio signal and the video signal. The system also comprises a second circuit for adding a code and a synchronizing signal to the digital data which are obtained from the first circuit, and for transmitting the digital data having the first code and the first synchronizing signal added thereto. The first code is at least indicative of a number of times the digital data are repeatedly transmitted within the predetermined transmission time period.
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 memory circuit write-in system comprises a first circuit for supplying a digital signal including a time base fluctuation component, where one frame of the digital signal is constituted by at least a synchronizing signal and information data and the digital signal has a first repetition frequency with a period of one frame of the digital signal, a memory circuit for writing therein and reading out therefrom the digital signal supplied from the first circuit, and a second circuit for applying a write-in control signal to the memory circuit. The write-in control signal includes no time base fluctuation component and has a second repetition frequency substantially equal to the first repetition frequency, and the memory circuit is controlled by the write-in control signal so that write-in of the digital signal is carried out with a write-in period in a range of two times within the one frame period.
摘要:
An information signal recording medium has a spiral track on which an information signal is recorded. The information signal includes picture element data which correspond to one field, and is time-sequentially recorded on the spiral track in terms of the picture element data which correspond to one field. The picture element data which correspond to one field are made up of a plurality of picture element data of a first field and a plurality of picture element data of a second field, among picture element data which are obtained by subjecting an analog video signal to a digital pulse modulation, where the analog video signal corresponds to one frame made up of the first and second fields. A reproducing apparatus is designed to reproduce the second field in a sequence different from a sequence with which the recorded picture element data are reproduced from the information recording medium in the first field.
摘要:
A digital video signal reproducing apparatus comprises a reproducing circuit for reproducing a digital video signal from a recording medium, where the recording medium is time-sequentially recorded with the digital video signal having a signal format in which a header signal is added to each of divided picture element data groups which are obtained by dividing a picture element data group in terms of a predetermined unit, the picture element data group is obtained by subjecting an analog video signal to a digital pulse modulation at a sampling frequency such that a product of a number of picture element data in one scanning line and an effective number of scanning lines in one picture of a standard television system is exceedingly close to 2.sup.18 but less than 2.sup.18, and the header signal at least comprises a synchronizing signal and a picture mode identification code, a header signal reproducing circuit for discriminating the header signal within the digital video signal reproduced by the reproducing circuit and reproducing the header signal, two memory circuits into which the picture element data group within said reproduced digital video signal is written and from which a stored picture element data group is read out, a circuit for controlling write-in and read-out with respect to the two memory circuits according to a code in the reproduced header signal, and a circuit for producing an analog video signal in accordance with a standard television system from the picture element data read out from the two memory circuits.
摘要:
An address signal generating circuit for a memory circuit comprises a first latch driver for producing a signal corresponding to upper m bits of a 2m-bit address signal which is to be generated, where m is an integer, a second latch driver for producing a signal corresponding to lower m bits of the 2m-bit address signal, a circuit for dividing a 2m-bit signal which has a predetermined value into upper m bits and lower m bits and for alternately producing signals corresponding to the upper and lower m bits, a first adder for adding the value of n bits in the signal which has the predetermined value and the value of upper n bits in an output signal of the first or second latch driver and for producing an n-bit signal, where n is an integer less than m, a second adder for adding the value of m-n bits in the signal which has the predetermined value and lower m-n bits of the output signal of the first or second latch driver and for producing an (m-n)-bit signal, an adding circuit for supplying a carry signal of the first or second adder to the second or the first adder so as to add the carry signal with another input signal of the second or the first adder, and a driver control circuit for controlling the first and second latch drivers to alternately and time-divisionally produce upper m bits of the 2m-bit address signal and lower m bits of the 2m-bit address signal by alternately latching an m-bit output signal of the first and second adders in the first and second latch drivers.
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 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 digital signal recording system and a reproducing apparatus for reproducing signals recorded according to this recording system comprise a circuit for alternately transmitting a first digital luminance signal and a first two kinds of digital color difference signals obtained by subjecting a color picture information signal to digital pulse modulation, in terms of information of one or a plurality of scanning lines, and producing a first digital video signal having a signal format wherein signal components of two sampling points of the first digital luminance signal are arranged within the same word and signal components of the same sampling point on a picture of the first two kinds of digital color difference signals are arranged within the same word; a circuit for time-sequentially multiplexing the first digital video signal and the digital audio signals obtained by subjecting audio information signal to be recorded to digital pulse modulation, in terms of words, and recording the time-sequentially multiplexed signal onto the same one track on a recording medium; a decoder for demodulating and reproducing analog audio signals from a signal picked up and reproduced from the recording medium; and a circuit for producing an analog video signal in accordance with a standard television system, from the output first digital video signal of the decoder.