Abstract: A signal reproduction apparatus reproduces data from an information recording disc. The data is recorded for every data block and is modulated so that data in one data block has n (n is an integer) bits including arbitrary m (m is integer and less than the n) bits each having an active value. The signal reproduction apparatus includes, a reading circuit reading out the data from the information recording disc, a converter converting the data into a pulse signal for every data block, the pulse signal having an active pulse corresponding to the active value of the data and an inactive pulse corresponding to the inactive value of the data, a judgment circuit judging whether or not the pulse signal has m active pulses for every data block, and a correction circuit correcting the pulse signal so that the pulse signal has m active pulses in one data block when the judgment circuit judges that the pulse signal has a number of active pulses other than the m in the one data block.

Abstract: A laser video disk master is operated at 2.times. speed for duplicating video information to be recorded in VHS format. Two last disk video players are modified to operate in synchronism in order to multiplex from one to the other in duplicating video programs of length equal to the two recorded disks. The 2.times. frequency NTSC format video output signal is then demodulated, drop out detection is performed, and the digitally-encoded stereo audio information is separated, error corrected, and converted by digital to analog (D/A) conversion to left and right channels of stereo analog information. The left and right channels of audio information are presented simultaneously to an FM modulator for presentation to rotating video heads and to a 2.times. Dolby processor for presentation to linear heads. The demodulated 2.times. video information is converted to digital information by an analog to digital (A/D) converter and then time-base corrected and drop out compensated.

Abstract: Apparatus is provided for reproducing either M channels of digital audio signals recorded in longitudinal tracks on a record medium or an analog audio signal recorded in one or two stereo tracks. M heads are used to reproduce the M channels of digital audio signals and N of those heads (N.ltoreq.M) are used to reproduce the analog audio signal. The reproduced digital or analog audio signals are multiplexed and digitized. When digital audio signals are reproduced, the digitized multiplexed signals are digitally processed and then converted to analog form. When analog audio signals are reproduced, the digitized multiplexed signals are summed such that signals reproduced by the N heads are combined to form a digital representation of the recorded analog audio signal. The summed signals then are converted to analog form to recover the original analog audio signal.

Abstract: A video signal recording system in a digital VCR wherein an analog composite signal is converted into a digital component signal and the digitally converted signal is recorded on the video cassette tape. The video signal recording system adopts 2-channel, 4-head recording system instead of 2-channel, 2-head of 1/2 inches VHS system, in order to record one frame data on eight video tracks. The number of rotations of the head drum is 3600 rpm.

Abstract: For recording video signals of different TV systems in the same track format, effective pixels corresponding to the data of one frame of each TV system video signal are divided into segments of a multiple of 27 and a one frame data component of each segment is compressed to an equal size. Accordingly, the video signal is recorded in the format of 27 segments per track.

Abstract: A method and apparatus for modulating a data reference clock for rotational speed variations of the data storage disk in a direct access data storage file. A data reference clock is generated from an encoded disk rate clock of the data file. A readback signal from at least one predetermined region of the disk surface is sensed and a sync byte is detected responsive to the readback signal. An early window control signal and a late window control signal are generated corresponding to end boundaries for capturing readback encoded data signals. A load complete signal is identified responsive to the readback signal. The identified load complete signal with the early window control signal and the late window control signal and the generated data reference clock is adjusted responsive to overlapping compared signals.

Abstract: In transmission or recording of a digital signal by means of digital amplitude and phase modulation, particularly recording into and reproducing the same from the a magnetic recording medium, a digital amplitude/phase modulated signal to be demodulated is commonly affected by the non-linear amplitude characteristics and the effects of unwanted jitter and envelope variation. As the result, the error rate of decoded data will be increased. For compensation, the Viterbi decoding technique is employed with the use of a weighted distance value calculated by multiplying an Euclidean distance between the signal point of a reproduction signal and the datum point of each code by a positive weighting factor which is determined smaller when the code datum point is located further from the origin point of a coordinate system. Accordingly, the weighted distance of each reproduction signal point from its corresponding datum point can approximately be uniform thus ensuring less error decoding in general.

Abstract: A magnetic tape for the recording of digital video signals is constituted by a nonmagnetic base having thereon a magnetic layer of at least one thin magnetic metal film which has an energy product of at least 100 G.cm.Oe, and with the surface roughness of the magnetic tape being at most 0.003 .mu.m in center line average height. Such tape, when used with magnetic heads each having a gap defined between portions of the respective head having a saturation magnetic flux density of at least 14 kG., contribute to the maintenance of an acceptable raw error bit rate below 1.times.10.sup.-4 when recording with a recorded bit area of no more than 1.25 .mu.m.sup.2 /bit.

Abstract: A magnetic recording apparatus for electrocardiographs wherein an input signal is converted into a digital signal, such digital signal is accumulated and intermittently recorded, thereby enabling electric power consumption to be reduced and efficiency of use to be improved. Parallel memories are used to store the digital signal at a first rate and the digital signal is read from the memories at a second rate higher than the first rate.

Abstract: A system, or applique apparatus, for recording and reproducing large numb of electrical signals on input channel limited recording devices is described. It is accomplished by time sequencing groups of pluralities of separate input signals to a plurality of recording units within a recorder, wherein each recording unit handles a separate group of input signals. The time sequence is provided by a multiplexer controller and is common to each group. The plurality of recording units after recording the signals provide them in the groups in which they were received to respective demultiplexers. A demultiplex controller that receives 2 timing signals from the multiplex controller via the recorder supplies timing signals to the plurality of demultiplexers for reconstruction of the original input signals.

Abstract: An apparatus for reproducing information converts read signals for servo fields and read signals for data fields recorded on an optical disk to digital data. The input range of the A/D converter at the time of A/D conversion of the read signals for servo fields and that at the time of A/D conversion of the read signals for data fields are controlled so as to be different from each other.

Abstract: A replay equalization circuit for reproducing digital image information recorded on a recording medium includes a transducer for reading the digital image information, an equalization circuit connected to the transducer for equalizing an output of the transducer based on a speed information input, a clock recovery circuit connected to the equalization circuit for extracting a clock signal from an output of the equalization circuit for latching the output of the equalization circuit in response to the clock signal.

Abstract: A magnetic recording transfer method for use with the combination of a mother magnetic recording medium and a copy magnetic recording medium of a metal-deposited thin film type each. The two media are overlaid so that the column inclination of one medium will be opposite in direction to that of the other medium. This method comprises the step of externally applying a biased magnetic field to the combination of the media in such a manner that magnetized recordings on the mother medium will be transferred to the copy medium. The easy axis of the mother medium is positioned at an angle of 20.degree..+-.15.degree. with respect to the in-plane direction of the medium. The biased magnetic field is applied to the mother medium at an angle of 110.degree..+-.15.degree. with respect to the in-plane direction of the medium.

Abstract: In a digital video recording and playback apparatus, at the time of recording, an analog signal is converted into a digital signal by an analog/digital converter and the thus-converted digital signals are stored in a memory on the recording side for each unit such as a frame and a field under the control of a memory address controller on the recording side. The stored digital signals are recorded on a digital audio tape by a digital recording device. At the time of playback, the digital signals are played back from the digital audio tape by a digital playback device, and are stored in a memory on the playback side for each unit such as a frame and a field under the control of a memory address controller on the playback side. The stored digital signals are converted into analog signals by a digital/analog converter before being outputted.The read and write operations for each individual memory are different.

Abstract: A PCM signal recording/reproducing apparatus includes write means for writing data on a recording medium, a data detecting circuit for detecting data from the recording medium, a temporary storage unit for storing temporarily the data to be recorded on the recording medium or the data reproduced from the recording medium, an error correcting circuit for correcting error of the data through cooperation with the storage unit and a switching circuit for changing over a first mode in which first data of two channels each having a sampling frequency of 48 KHz and a quantization bit number of n are recorded/reproduced with a second mode in which second data of two channels each having a sampling frequency of 32 KHz and a quantization bit number of n are recorded/reproduced in accordance with a recording format having a data location for the input data and dummy data location for dummy data to be added to the input data.

Abstract: An arrangement for reading a digital audio signal from a master medium (7) and storing it in a digital storage medium (10, 90, 90') at a first bit rate in a first step, and for repeatedly reading the digital audio signal from the storage medium and recording the digital audio signal on a recording medium (20') at a second bit rate in a second step. The digital storage medium is adapted to store a digital information signal which is a representation of a first music program (M1) and a digital information signal which is a representation of a second music program (M2). The arrangement (FIG. 1b) is further adapted to repeatedly read the digital information signal representing the first music program from the digital storage medium while reading the digital information signal representing the second music program into the digital storage medium in the second step.

Abstract: There is provided a disc recording apparatus for recording digital data by an optical unit in such a manner that time compressed digital data are arranged into a plurality of clusters at an interval of a predetermined number of sectors, a cluster-linking sector having a length longer than an interleaving length is provided at each linking part of each cluster, and the digital data are subsequently interleaved and recorded on a disc-shaped recording medium so that interleaving at the time of data recording on the cluster-by-cluster basis is within the range of the cluster-linking sector.

Abstract: A video recorder and playback device allowing simultaneous recording and playback of program material, including means for controllably varying a time delay between the recording and playback of recorded material. This allows, for example, playback of previously recorded material to be temporarily stopped and then resumed without interrupting the recording of new material. A user can arrange to start recording a broadcast program (while the user is not at home, for example) in the conventional way via stored instructions, and then begin watching the recording several minutes or hours later, before the program is over, without stopping the recording. The user can also interrupt the playback of a program that is being recorded as it is being watched (to take a telephone call, for example), and then resume playback of the program (after the phone call is over) without stopping the recording. The user can then watch the rest of the program delayed by a time period equal to the length of time of the interruption.

Abstract: A recording and reproducing apparatus having a rotary head drum includes a timing signal converter for converting one of a first timing signal and a second timing signal to the other. The converter comprises a generator for generating first and second select signals, a memory for storing the first timing signal in response to the first select signal and for reading out the stored signal in response to the second select signal, a processor for processing the output signal of the memory to generate the second timing signal synchronously with the rotation of the rotary head drum, and a recording/reproducing head for recording the second timing signal onto a slant track formed on a recording medium, and for reproducing the second timing signal.

Abstract: Apparatus and method of thermal asperity compensation are provided for data detection in a partial-response maximum-likelihood (PRML) data channel. The PRML data channel includes an analog to digital converter (ADC) having a normal operating range and a filter, gain and timing control coupled to the ADC. When a thermal asperity is detected, a thermal asperity recovery mode is established responsive to the detected thermal asperity. The gain and timing control are held and the normal operating range of the ADC is adjusted responsive to the thermal asperity recovery mode. Also an AC coupling pole frequency is elevated responsive to the thermal asperity recovery mode.

Abstract: A duplicate recording system uses video cassettes for storing master library recordings. On both the recording and the duplicating ends of the system, all signals are buffer stored in an electronic memory while the signals are in a digital form. This buffer storage completely isolates the recording/reproducing steps so that the usual parameter of restraints disappear. For example, the duplication ratio may be any value within the capabilities of the recording/reproducing machines. This isolation eliminates expensive setup procedures heretofore required to switch from one to another duplicating ratio. The buffer storage also provides a more precise transfer with greater fidelity of the recorded signals. A computer calculates a smoother analog curve when the digital-to-analog conversion is made.

Abstract: A magnetic recorder/reproducer converts two-channel analog signals into digital signals by a sample-and-hold/A-D converter circuit (3) and controls addresses in a memory circuit (4) by a memory address control circuit (5), to distribute the digital signals into odd sample groups and even sample groups per each channel for arraying the odd sample groups and the even sample groups of the same channel in alternate scanning intervals, thereby to write the same in the memory circuit so that the odd samples and the even samples of the same channel are arrayed in positions separated from each other along the direction of scanning by rotary heads (10, 11). The digital signals thus permutated are modulated by a modulation circuit (7), to be recorded in a magnetic tape by the rotary heads. The digital signals reproduced by the rotary heads are demodulated by a demodulation circuit (14), to be stored in a memory circuit (15).

Abstract: A signal reproducing method comprising the steps of: inputting a reproduction signal of a signal which was encoded by a predetermined coding system; converting states of a plurality of portions of the waveform of the reproduction signal into numerical values in order to reproduce the input reproduction signal as the signal of a code train of "1" or "0"; and sequentially determining the portions as many as only the number specified by the coding system among the plurality of portions which were converted into the numerical values to be "1" on the basis of the magnitudes of the numerical values. By this arrangement, a signal reproducing method which can be reduced code errors of the reproduced signal may be provided.

Abstract: The structure of the RAM in the signal processing circuit of a digital audio tape recorder. When the reproduction mode is switched over to the recording mode, or the sampling frequency for the recording is changed to a different sampling frequency, a RAM clear signal is automatically output. At the output of the RAM clear signal, a converting circuit disposed in the route from a read address generator to an address bus is operated so as to read the digital sound data from the RAM and supply the digital sound data to a recording head and record it on a magnetic tape. Address signals only in the odd blocks of the RAM are generated and null data is serially written thereinto, thereby clearing the RAM.

Abstract: A MUSE signal recording/reproducing apparatus for converting a MUSE signal into a digital signal and for recording/reproducing the same, including an HDVTR, a signal processing device, and a control device for controlling the HDVTR and the signal processing device. The HDVTR is a device capable of recording/reproducing effective lines and effective picture elements of a high definition television signal. The signal processing device performs A/D conversion and multiplex processing of two synchronizing MUSE signals to convert the same into frequency double that of a MUSE signal, and further performs rate conversion corresponding to recording frequency and phase of the HDVTR. The HDVTR records the rate-converted data.

Abstract: A digital video tape recorder for digitally recording and/or reproducing a video signal. An analog video signal is received and converted to a digital signal which is supplied to a time base corrector for correcting a time base error in the input video signal by writing the digital signal into a memory in response to a synchronizing signal derived from the input video signal and reading out the stored digital signal from the memory in response to a reference signal. The output signal of the timebase corrector is processed and recorded on a magnetic tape by a rotary head.

Abstract: A digital signal processing circuit has a memory circuit to store reproduction data and recording information, a reproduction signal processing circuit for demodulating a reproduction signal to thereby obtain the reproduction data and the recording information and for storing the reproduction data and the recording information into the memory circuit, an error detecting and correcting circuit for executing an error detecting and correcting process on the reproduction data, and a data output circuit for outputting the reproduction data stored in the memory circuit on the basis of the recording information.

Abstract: A digital image recording and reproducing apparatus includes a serial-to-parallel converter connected between an image memory and a data memory, for converting serial image data from the image memory into parallel image data, and a parallel-to-serial converter connected between the image memory and the data memory, for converting parallel image data from the data memory into serial image data. The serial-to-parallel converter is operated when the image data are to be transferred from the image memory to the data memory, and the parallel-to-serial converter is operated when the image data are to be transferred from the data memory to the image memory. Since the data can be transferred from the data memory to the image memory with a minimum number of bits required to allow displayed images to be recognized, the time required to reproduce images is shortened, and hence the image retrieval time is also shortened.

Abstract: An image signal recording system for recording an image signal corresponding to an original picture comprised of m picture elements (m being an integer, m.gtoreq.4) on a recording medium, in which the original picture is divided into m/n picture element blocks, each comprised of n picture elements (n being a measure, 2.ltoreq.n.ltoreq.

Abstract: A data compression circuit is provided for a digital audio tape recorder for converting an analog audio signal of standard 16 bit data to compressed 12 bit data when the recorder is in four-channel or long play operation mode. The compression circuit can compress standard data to be recorded with a sampling frequency of 48 KHz and a quantization of 16 bits in long play mode resulting in a compressed data recording in which sampling frequency is 32 KHz and the quantization is 12 bits. Thus, recording the compressed data occurs about twice as fast as recording standard data. Moreover, since the overall amount of recorded data is reduced owing to 12-bit linear compression, channel expansion on the tape is provided.

Abstract: A digital image signal playback circuit, the amount of hardware of which is greatly reduced. The circuit converts serial data transmitted in two channels into parallel data, corrects their time base errors by controlling how the parallel data is written into and read from memories, detects a synchronizing signal in the single channel output from the memories, and determines and outputs the original image signal from the single channel signal that may contain errors from the recording and playback operation.

Abstract: In an information recording/reproducing apparatus for recording/reproducing a digital audio signal on/from a magnetic medium, a modulator/demodulator for modulating/demodulating the digital signal by offset quadrature phrase shift keying (O-QPSK). This technique is particularly applicable to the multi-layer recording of video and audio signals in a video tape recording/reproducing system and has the advantage of avoiding interference between the recorded digital audio and video signals at the time of reproduction.

Abstract: In an information transmitting device which transmits information in a preamble portion and a plurality of data blocks as a unitary set, when a block synchronizing code in the data blocks is detected, the timing of the detection and the block synchronizing code are determined to be correct or are subjected to error correction, and are utilized to reproduce information contained in the preamble portion.

Abstract: Disclosed is a PCM signal reproducing/recording apparatus which comprises a reproducing device for reproducing a recording medium carrying PCM data and sub-code data recorded thereon, the sub-code data having sub-data and sub-ID for adding auxiliary information to the PCM data, and a recording device for recording the PCM data and sub-code data transmitted from the reproducing device onto a recording medium. The recording device is arranged to selectively record the sub-code data judged to be correct, onto a recording medium, of those sub-code data transmitted from the reproducing device.

Abstract: A signal reproduction and method therefore device for a digital signal reproduction apparatus, which reproduces digital signals recorded on a recording medium with a reproduction head. The device includes a first memory circuit which sequentially stores digital signals reproduced by the reproduction head, a circuit which identifies the attribute of a reproduced digital signal and a write control circuit which judges, based on the result of the identification provided by the identification circuit, whether digital signals of a prescribed unit length included among digital signals stored in the first memory have the same attribute, and produces a write signal in response to the judgment. Also provided is a second memory which is connected to the first memory and stores the digital signals which have the prescribed length and are judged to have the same attribute in response to the write signal.

Abstract: A recording position compensation circuit for use in the digital information recording-reproduction apparatus of the present disclosure has a microprocessor for generating an offset signal indicating a deviation between standard signal processing time, which is required for a process wherein digital medium information already recorded on the recording medium is reproduced through the advanced reproduction head and re-recorded on the recording medium through the recording head, and inter-head travelling time required for the recording medium to travel a distance from the advanced reproduction head to the recording head. A first counter generates a reference symbol pointer indicating a reference of a sequence whereby digital information stored in the memory is read out so that a part of the digital information is rewritten. A second counter generates a compensated symbol pointer having a phase difference corresponding to the deviation with respect to the reference symbol pointer.

Abstract: An information track on a record carrier (2) is read by a read head which includes detectors producing detection signals (IA, IB, IC and ID) which correspond to the information pattern on the track. The respective detection signals are converted by analog-to-digital converters (16a, 16b, 16c and 16d) into respective series of n-bit digital signal values (ua, ub, uc and ud). From such signal values a data signal (SD) is derived which is representative of the information being read. The signal values are also applied to respective cascade arrangements of a quantizing circuit (21a, 21b, 21c and 21d) and a decimating filter (22a, 22b, 22c and 22d), which convert them into respective series of signal values (va, vb, vc and vd) which represent only the low frequency portion of the information in the detection signals produced by the read head and include control information relating to tracking by the read head.

Abstract: A digital signal processing circuit for use in different types of digital audio tape recorder that record a standard track format using different arrangements of rotary drum and the like. The circuit provides a record signal having a transmission speed and timing switched in accordance with the structure of the rotary drum and the like.

Abstract: A digital signal reproducing apparatus wherein an analog signal corresponding to stored digital data is processed to generate a digital data signal including an analog-to-digital converter operative to convert the analog signal to a digital signal, a decoder to decode the digital signal, and a memory interposed between the analog-to-digital converter and digital decoder to remove time base components from the digital signal. The analog signal is converted to the digital signal and the digital signal is read into the memory at a first clock rate. The digital signal is read out from the memory and subsequently decoded at a second clock rate.

Abstract: In an apparatus for transmitting digital data which includes information data and synchronous data having a plural-byte code arranged in a plural-byte code of the information data; the top bit position of the sync code is predicted by converting the transmitted digital data into parallel data at a desired timing and then comparing each byte of the parallel data with a particular byte of the sync code; and the sync code is detected in the transmitted digital data by first extracting, from the parallel data, a length corresponding to the plural-byte sync code starting from the predicted top bit position of the sync code and then comparing the extracted parallel data with the sync code.

Abstract: A data recording apparatus includes a digital input processing circuit, an analog input processing circuit including an A/D converter for recording the analog input signal in digital form, a switch for selecting either digital or analog input signals for recording, and a control circuit. Normally, the apparatus records the digital input signal. When the digital input processing circuit detects a synchronizing error or inhibition of recording the digital input signal (digital copy) by analyzing the sub-code signal of the digital input signal, the control circuit controls the selecting switch so as to select the analog input signal. In order to reduce unnatural level variation due to change of selection between the digital and analog input signals, there are further provided a polarity change circuit, variable delay, and variable gain amplifier for the analog audio signal.

Abstract: A multitrack audio system having rotary heads by which audio signals are recorded onto a plurality of tracks and played back from the tracks on a magnetic tape comprises a track grouping circuit for dividing the tracks into track groups having the predetermined number of tracks; a type switching circuit for selecting the track groups; a first to fourth clock oscillators for generating sampling frequencies; a first circuit group which comprises a S/H circuit 15, and A/D conversion circuit, a 10-8 conversion circuit 19, and error detection/correction code additional circuit 21, and a time axis compression circuit 23 for converting the audio signals to digital signals; a modulator; a recording and playback circuit; a demodulator; a switching circuit for selecting the track group as an object of playback; and a second circuit group, which comprises a time axis re-expansion circuit, a error detection/correction circuit, a 8-10 conversion circuit, an interpolation circuit, and D/A conversion circuits for converting

Abstract: Apparatus for recording and reproducing digital signals wherein the digital signal is recorded or reproduced during a data blank interval which is a buffer during which the rotary heads change over or is spliced between data due to time base compression and wherein redundant data is recorded for error detection or error correction during said data blank interval before and after the data transmitting interval.

Abstract: A magnetic recording and reproducing apparatus records audio signals digitized by rotary heads (9, 10) on a magnetic tape (12), and reproduces the recorded audio signals. Clock signals and time code data are extracted from externally inputted time code signals by means of a demodulating circuit (72), and phase difference between the frame clock signals and the reference signal is detected by a phase difference detecting circuit (74). A microcomputer (23) assigns the phase difference information and the time code data to sub code packs and stores the same in the memory circuit (4). The stored phase difference information and the time code data are recorded on the magnetic tape. In reproduction, the microcomputer outputs the original time code signals responsive to the reproduced phase difference information and the time code data.

Abstract: A rotary head type recording and reproducing apparatus of the kind recording information codes on a tape-shaped recording medium by forming many parallel recording tracks and at the same time an additional code consisting of one byte at a predetermined position in each of the recording tracks and reproducing, by means of rotary heads, the signals from the medium, the apparatus is arranged to perform the reproduction as follows; A tracking error signal is formed by using signals reproduced from the rotary head. The tracking error signal is sampled at such a timing that enables the rotary head to reproduce the additional code. The position of the recording medium relative to the rotary head is controlled on the basis of the tracking error signal thus obtained.

Abstract: A PCM (pulse code modulated) audio signal recording and/or reproducing apparatus, operates with plural scanning periods, in which a rotary head scans obliquely the longitudinal direction of a tape, and which scanning periods are separated into a plurality of segment periods. PCM audio signals are recorded on one or more channels of a plurality of track channels, formed by the alignment of respective segment tracks which are scanned by the rotary head during the corresponding segment periods of each scanning period, and an identifying signal, indicative of the fact that the PCM audio signals is already recorded, is superimposed upon the PCM audio signal and recorded together therewith on the track channels, whereby it becomes possible to easily identify whether or not the PCM audio signal is recorded on the of track channels.

Abstract: A digital audio signal is reproduced from a master medium (7) and stored in a digital storage medium (10, 90, 90') at a specific first bit rate, after which it is read from the digital storage medium and recorded on a recording medium at a second bit rate. The digital audio signal, in the form of a first digital information signal having channel words of n data bits, is stored in a track (Ta.i) on the master medium. This signal is converted in an n-m demodulator (9, 15), the n-bit channel words being converted into m-bit information words, where n>m. After this the signal is stored in the digital storage medium (90, 90') as a second digital information signal. After read out from the storage medium (90, 90') the second digital information signal is converted into a third digital information signal, which substantially corresponds to the first digital information signal, in an m-n modulator (11, 36), in whcih the m-bit information words are reconverted into n-bit channel words.

Abstract: A magnetic recorder/reproducer converts two-channel analog signals into digital signals by a sample-and-hold/A-D converter circuit (3) and controls addresses in a memory circuit (4) by a memory address control circuit (5), to distribute the digital signals into odd sample groups and even sample groups per each channel for arraying the odd sample groups and the even sample groups of the same channel in alternate scanning intervals, thereby to write the same in the memory circuit so that the odd samples and the even samples of the same channel are arrayed in positions separated from each other along the direction of scanning by rotary heads (10, 11). The digital signals thus permutated are modulated by a modulation circuit (7), to be recorded in a magnetic tape by the rotary heads. The digital signals reproduced by the rotary heads are demodulated by a demodulation circuit (14), to be stored in a memory circuit (15).

Abstract: A digital audio tape recorder is adapted for recording non-music signals such as, typically, those representative of measurements being made in real time by one or more instruments or meters, together with brief vocal commentary on the measurements and/or with the date and time at which the measurements are made. If the measurements of two instruments or meters are to be recorded simultaneously, the two measurements signals as well as the vocal commentary signal are first digitized. A multiplexing circuit combines the first measurements signal and the commentary signal into a first series of composite data words, and the second measurements signal and a digital time signal into a second series of composite data words. The bits of each composite data word are apportioned between the first measurements signal and the commentary signal, and between the second measurements signal and the time signal, according to their expected relative amounts to be recorded.

Abstract: In this invention, a predetermined amount of data is given as one frame, and data having a predetermined format is recorded for each frame. A first area recording main data and a second area recording sub data are formed in each frame. Plural types of units each consisting of a plurality of frames are set, and a number of first units from a leading end of a recording medium and the numbers of other units from the leading end of the recording medium to a trailing end of the first units are recorded in the second area of a frame constituting the unit including the trailing end, thus facilitating a high-speed search operation.