Abstract: A real-time image compression processor records on a CD or other recording media a compressed video signal which is compressively processed in a high recording efficiency at real-time as being reproduced by a VTR while preventing the image quality from being degraded. There are provided a first encoder for compressively encoding the video signal, and a second encoder for compressively encoding the signal obtainable by delaying such video signal for a given period of time. A parameter adjustment is executed for the second encoder in accordance with the compressed video signal obtained through the compressive encoding by the first encoder. The compressed video signal obtained by the second encoder is recorded on a recording medium.

Abstract: In a recording medium playback device, such as a tape recorder, the playback speed is changed from the speed used during recording but the sounds and voices being reproduced can be listened to at the normal pitch, as if the playback tape speed was the same as the recording speed. A frequency generator (FG) system is not required and the playback signal is converted in pitch based on a capstan motor drive signal that is converted to a voltage value and that controls a pitch converting circuit. Alternatively, the pitch converting circuit is controlled by a signal derived from a speed control system, whereby the capstan motor speed is controlled by the user of the tape recorder. By converting the pitch of the playback signal in this way a recording of a conference, for example, can be scanned at high speed yet the reproduced voices are provided with a normal pitch.

Abstract: An apparatus processes an analog audio signal having been stored in a recording medium in a recording order and being reproduced therefrom in a reverse order of the recording order and at a speed .alpha. (.alpha..gtoreq.1) times higher than a recording speed to the recording medium. The analog signal is converted to digital audio signals and written in a memory having head and final addresses. The digital audio signals read from the memory are converted to an output analog audio signal. A controller controlling writing and reading the digital audio signals to and from the memory has a read address controller for controlling read addresses of the memory such that the read addresses repeatedly reciprocate between the head and final addresses. The controller controls the writing such that, if .alpha.>1, the writing starts in sequence from the head or final address when the read address reaches in the vicinity of an address which advances by (.alpha.-1) / .alpha.

Abstract: A data recording apparatus for recording a digital signal onto a magnetic recording medium at one of a plurality of data recording rates. The apparatus comprises a detection device for detecting a change in value of the digital signal, a first variable current source for generating a first current having a value which is varied in response to a data rate of the digital signal, a second variable current source for generating a second current, a recording head for recording the signal into the magnetic recording medium, a current output device for outputting the second current or an added value of the first current and the second current in response to detection results of the detection device, and a recording head driving device for driving the recording head in response to an output of the current output device and the digital signal so as to enable recording at a desired data rate.

Abstract: A processing system and a recording/reproducing system for a digital signal including a digital video signal and a digital audio signal are disclosed. Upon transmission, the digital signal is transmitted after time-base compression and modulation. The transmitted signal is received and demodulated. In the case where the signal is to be transmitted to a plurality of recording/reproducing systems, address signals designating ones of the plural recording/reproducing systems and a control signal for controlling the start/stop of recording are transmitted. The recording by the recording/reproducing system is controlled so that it is made with the same format in either normal-speed or high-speed mode or in either normal or multiple recording mode.

Abstract: A processing system and a recording/reproducing system for a digital signal including a digital video signal and a digital audio signal are disclosed. Upon transmission, the digital signal is transmitted after time-base compression and modulation. The transmitted signal is received and demodulated. In the case where the signal is to be transmitted to a plurality of recording/reproducing systems, address signals designating ones of the plural recording/reproducing systems and a control signal for controlling the start/stop of recording are transmitted. The recording by the recording/reproducing system is controlled so that it is made with the same format in either normal-speed or high-speed mode or in either normal or multiple recording mode.

Abstract: A magnetic recording/reproducing apparatus in which the reproduced audio data is processed and is recorded in every N cycles during which the reproducing magnetic heads scan a pair of recording tracks. The recording magnetic head is positioned behind the reproducing magnetic head for 8.5+4N track pitch, so that a write-after-read processing is provided. Using the recording head positioned behind the reproducing head, the reproduced audio data is stored in a memory for time base compression or expansion, and in a multichannel mode the reproduced audio data is read out and recorded performing write-after-read processing even if the number of channels is changed. The 2.sup.n channel audio data is recorded using interleave processing in every N cycles of the heads forming a pair of recording tracks so that even if the cycle in which a pair of recording tracks is not an integral multiple of the sampling cycle, the plural channels of audio data can be recorded and/or reproduced.

Abstract: An apparatus for recording an electric signal (A) on a magnetic record carrier (1) includes at least one pair of write heads (K.sub.1, K.sub.2) having a mechanically rigid coupling to each other and arranged on a head drum (40). The record carrier (1) is wrapped around the head drum through a wrapping angle .alpha.. The pair of heads (K.sub.1, K.sub.2) writes pairs of tracks (T.sub.1, T.sub.2 ; T.sub.3, T.sub.4 ; . . . ) on the record carrier. The apparatus further includes a signal separator (4) for dividing the electric signal into consecutive blocks, after which the signal blocks having odd sequence number (B.sub.1, B.sub.3, . . . ) are applied to a first output (5) and the signal blocks having even sequence number (B.sub.2, B.sub.4 . . . ) are applied to a second output (6). In a time-base correction circuit (7) the signal blocks (A.sub.1, A.sub.2) are time expanded or compressed. .alpha. Differs from 180.degree..

Abstract: Using an IC memory card as a recording medium, quantized data is encoded in an unequal length manner by unequal length encoders, an error correction code is added in an error correction code addition section, and the data is recorded along with the control data of the fixed speed. At this time, a writing speed/time control circuit controls the writing speed or writing time corresponding to the number of the encoded bits per frame. An error correction method selection section modulates the length of the error correction codes corresponding to the number of the bits per frame. A buffer and countermeasures for overflow and underflow become unnecessary, error correction codes can be efficiently added, and the access to the respective frame units becomes easily possible.

Abstract: In a magnetic recording and/or reproducing apparatus, when the reproduced audio data is processed in the reproduction system and the record system and is re-recorded in every cycle of N times the cycle during which the reproducing magnetic head scans a pair of recording tracks, the recording magnetic head is positioned behind the reproducing magnetic head for 8.5+4N track pitch so that the reproduced audio data can be re-recorded on the original recording track, therefor a write-after-read processing can be realized. In the recording magnetic head positioned behind the reproducing magnetic head for the specific track pitch, the audio data is stored in a memory circuit for time base compression and expansion with a multichannel mode such as to record the reproduced audio data at the same part on the magnetic tape, so that a magnetic recording and/or reproducing apparatus which enables to perform the write-after-read processing can be obtained with simple construction if the number of channel is switched.

Abstract: An analog signal which forms part of a digital audio recording system is split into at least two signal paths in one of which it is delayed slightly before being recombined with each signal of the other signal path or paths. The delay can be effected by using a multistage filter in the delay line, which causes the signal in the delay line to be delayed for a period of time equal to a fraction of one cycle of the sampling frequency of the associated digital recording system. The slight delay eliminates or minimizes undesirable phase shifting which is created in the analog signal by the sampling frequency.

Abstract: A method and apparatus for recording and/or reproducing digital image data is disclosed which are compressed by an interleaving process using a logic product code.

Abstract: A retrieval device and method for retrieving audio signals recorded on a floppy disk, in which the audio signals are reproduced by an amount needed to recognize the content of the audio signals to obtain a heading of the audio signals. A track of the floppy disk is divided into sectors. The audio signals are recorded in various sectors, and the head of the audio signals are recorded in one of the sectors. The audio signals are reproduced from the head, and can be reproduced within a predetermined time, regardless of a compression ratio compression ratio that is used, and the audio signals may be that is used with the audio signals. The amount of the reproduced audio signals may be changed in accordance with the reproduced at a high speed.

Abstract: The present invention relates to a digital image signal recording/reproducing apparatus and the method thereof which can maintain a track spacing whereto a digital image signal is recorded during a long time mode in the same way as in the normal mode when the digital image signal is recorded on the recording medium, so that the crosstalks between channels caused by narrowed channel spacing of a tape can be prevented to thereby obtain an effect of a clear picture without a picture quality degradation.

Abstract: An information processing system includes a digital computing system, an analog processing device with an arrangement for converting electrical information to information of analog form, and an arrangement responsive to the analog information energy for producing output electrical information. Output data from the digital computing system is applied to the analog processing system via a D/A converter, and an A/D converter applies the output electrical information to the digital computing system. Data modified by the analog processing system may be employed to supplement data applied thereto in a random manner, or in a manner with a known transfer function, in order to introduce perturbations in the data to aid in subsequent processing thereof in the digital computing system.

Abstract: A processing system and a recording/reproducing system for a digital signal including a digital video signal and a digital audio signal. Upon transmission, the digital signal is transmitted after time-base compression and modulation. The transmitted signal is received and demodulated. In the case where the signal is to be transmitted to a plurality of recording/reproducing systems, address signals designating ones of the plural recording/reproducing systems and a control signal for controlling the start/stop of recording are transmitted. The recording by the recording/reproducing system is controlled so that it is made with the same format in either normal-speed or high-speed mode or in either normal or multiple recording mode.

Abstract: An audio receiver FIFO memory buffer in the serial digital video interface allows improved timing synchronization between video and audio information. Furthermore, it eliminates unpleasant sound effects when multiple data samples are skipped or repeated in series. This FIFO receiver buffer receives data at an input write-data rate filling up the memory storage cells therein. An output read-data signal clocks the data out of the memory storage cells. The FIFO's fullness is monitored and maintained, in response to an external signal, to within a specified range delimited by an upper and a lower threshold. If the FIFO buffer fullness is below the range's lower threshold, then the FIFO's read address pointer is held so that the immediately preceding read out data element is read out again, but only once. On the other hand, the FIFO buffer fullness is over the range's upper limit, then the FIFO's write address pointer is held so that the immediately preceding written in data element is written over, but only once.

Abstract: A high-definition signal (HD) is separated to prevent the quality of an image from being deteriorated when the high-definition signal is mixed with a standard video signal. A low band signal of the HD signal from a decimation circuit (5) is supplied through a discrete cosine transform circuit (7), a quantizer circuit (8), a variable length coder circuit (9) and an encoder circuit (11) to a recording head (12). A signal from the quantizer circuit (8) is supplied through an inverse quantizer circuit (17) to a subtracter circuit (18). A signal from the discrete cosine transform circuit (7) is supplied to the subtracter circuit (18), thereby forming a difference signal between a decoded signal of the compresses signal and the original signal. This difference signal is supplied through a quantizer circuit (19) a run length coding circuit (20) and a variable length coder circuit (21) to an adder circuit (16).

Abstract: A video signal recording apparatus is provided with first and second channels for transmitting an input video signal. The first channel has a line memory for conducting a 1H delay on data and a time-base-extension line memory for conducting time base extension on the data with the 1H delay. The data subjected to the time base extension undergoes D/A conversion to be an output of the first channel. On the other hand, the second channel does not have a line memory for a 1H delay, and the video signal without delay is subjected, to time base extension and undergoes D/A conversion to be an output of the second channel. In the arrangement, odd lines and even lines respectively contained in adjoining two frames in each channel are reversed such that in a certain frame, odd lines of the input video signal are transmitted through the first channel with even lines through the second channel. In the next frame, even lines are transmitted through the first channel with odd lines through the second channel.

Abstract: An apparatus for recording and reproducing a video signal and a digital audio signal, the audio signal being recorded and reproduced in either a first mode or a second mode, includes a rotary drum having a pair of rotary heads and records the video signal and selectively records the audio signal on a magnetic tape wrapped around the rotary drum. When the video signal and selected digital audio signals are reproduced, a detector detects the frequency of a predetermined portion of the reproduced signal and judges the mode of the digital audio signal on the basis of the detected frequency.

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: In a digital information signal reproducing apparatus in which a first digital audio signal and a second digital audio signal having the same contents are recorded on two oblique tracks which are close to each other on a record tape while the latter is run at a normal speed, and in which the first and second digital audio signals are reproduced from the tape by plural rotary heads; a head position controller is operative to control a scanning position of each of the rotary heads so that the latter scan the tracks during variable speed reproduction when the tape is run at a speed different from the normal speed, and to cause the heads to periodically jump over a plurality of the tracks; a detector detects when the rotary heads controlled by the head position controller jump over the plurality of tracks; and a processor responsive to the detector for switching the first digital audio signal and the second digital audio signal, as in a cross-fading operation, for a predetermined period when a jump is detected an

Abstract: A random-access type storage device such as a hard disk or semiconductor memory is formatted to provide multiple partitions of varying block size. The data to be stored is in blocks of fixed size, and these blocks are compressed if the compressed size fits in the block size of a small-block partition in the storage device. If a data block is not compressible to the small block size, it is stored uncompressed in another of the partitions. The memory device also contains a table storing the locations of the blocks in the partitions, so upon recall the block is retrieved from location, decompressed (if it had been compressed), and sent to the CPU. For example, there may be two partitions, one using the block size of the original (uncompressed) data, and the other having a block size corresponding to the typical compressed size of the blocks of data (perhaps one-half the size of the original data blocks). The relative number of blocks in each partition (e.g.

Abstract: A method of recording and/or playing back a data signal, in an apparatus in which a tape helically encircles a drum containing a headwheel, and the heads scan oblique tracks on the tape, features reduction of the tape velocity by a factor 1/n where n is a positive integer. Along with the tape velocity change, the static tracking angle between the tape and drum is correspondingly adjusted so that the heads will continue to scan along a standard track pattern or format. The data rate of data signals retrieved from the tape (e.g. high-date rate satellite transmissions) or of incoming data signals can be converted to a different data rate by intermediate steps of writing to a digital memory and reading back at a more desirable data rate.

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: An improved video recorder/transceiver with expanded functionality ("VCR-ET") including a capability for storing video and video programs in digital format, editing such programs, transferring such programs onto a hard copy magnetic media, and transmitting such programs to a remote location using a second VCR-ET. The increased functionality is realized through the use of analog to digital conversion, signal compression and intermediate storage in an integrated circuit, random access memory. The recorder/transmitter has capabilities to transmit and receive program information in either a compressed or decompressed format over fiber optic lines, conventional phone lines or microwaves.

Abstract: A recording apparatus for recording sounds continuously over a plurality of successive tracks is provided with pause command means arranged upon actuation to terminate the recording on the track being accessed at present time, and upon deactuation to alter the access of the recording head to a different track from that accessed track in which recording of sound is started again.

Abstract: In a digital signal reproducing apparatus having a head on a rotating drum for reproducing a digital signal which includes information data and which was recorded on a magnetic tape running at a speed different from the tape speed during reproducing of the digital signal therefrom; the tape speed and the drum rotation speed are detected during reproducing and corresponding tape speed and drum speed signals, resectively, are generated, a clock signal is formed from the digital signal reproduced by the head and is used in decoding the information data from the reproduced digital signal, and a control device receives the tape speed and drumspeed signals for controlling the drum speed in accordance with the tape speed when the tape speed is at least as large as a first value and for maintaning a fixed drum speed while changing the clock signal in accordance with the tape speed when the tape speed is at least as large as a second value greater than the first value.

Abstract: A recording method is provided for simultaneously inputted sound signals of a plurality of types that are respectively time-base-compressed, rearranged serially according to types, and recorded on a track of a magnetic disk. In a reproduction method, time-base-compressed sound signals of a plurality of signal types are reproduced serially from a magnetic disk, and rearranged in parallel according to the signal types in the time base expansion.

Abstract: Accelerated throughput of voice messages is accomplished by first filtering a normal 50-3000 Hz voice signal to a reduced bandwidth 350-1650 Hz (with loss of identifying features), the reduced signal then accelerated X3 and translated downward to bandwidth 50-3950 Hz for transmission. The receiver recovers the 350-1650 Hz signal.

Abstract: In a system for recording digital data obtained based on an information signal on a magnetic tape and/or reproducing digital data obtained based on an information signal from a magnetic tape, a magnetic recording apparatus comprises an encoder for producing, based on the information signal, one of plural kinds of digital data which have different transmission rates respectively, a time base processor for selectively converting a time base of digital data obtained from the encoder so as to produce modified digital data having a predetermined transmission rate, a recording modulator for producing a recording signal corresponding to the modified digital data, a recording portion provided with a rotary magnetic head device to which the recording signal is supplied and a tape guide for guiding the magnetic tape and operative to cause the rotary magnetic head device to contact with the magnetic tape for forming oblique record tracks on the magnetic tape, a head driver for rotating the rotary magnetic head device at

Abstract: A digital signal recording apparatus is provided with data compressing means for reducing the amount of data of digital information supplied; recording means which is arranged to be capable of selectively recording the digital data supplied or digital data compressed by the data compressing means by means of at least one pair of heads; and switching means for switching a cycle in which recording is performed by the pair of heads from one cycle over to another according to the information to be recorded by the recording means.

Abstract: An improved video recorder/transceiver with expanded functionality ("VCR-ET") including a capability for storing video and video programs in digital format, editing such programs, transferring such programs onto a hard copy magnetic media, and transmitting such programs to a remote location using a second VCR-ET. The increased functionality is realized through the use of analog to digital conversion, signal compression and intermediate storage in an integrated circuit, random access memory. The recorder/transmitter has capabilities to transmit and receive program information in either a compressed or decompressed format over fiber optic lines, conventional phone lines or microwaves.

Abstract: A magnetic recording and playback apparatus using a magnetic head disposed on a rotating drum for forming oblique recording tracks in succession on a magnetic tape to record or playback serial data along the same, has a tracking control for controlling the height of the magnetic head in the direction perpendicular to the length of the recording track. A speed control is included for controlling the rotating speed of the rotating drum and/or the traveling speed of the magnetic tape in accordance with the bit transfer rate of the serial data so that the magnetic tape travels one reference track pitch while the rotating drum makes an integer number of rotations. A processor is included for compressing the serial data along the time base so that the serial data is recorded while the magnetic head scans the recording track.

Abstract: An information recording system and apparatus records on a recording medium an audio signal, which is time-base compressed at a predetermined compression ratio, together with a data signal indicative of the compression ratio. A start signal indicative of the start of the audio signal, the data signal, the audio signal and the end signal indicative of the end of an audio signal are recorded in this order. A recording medium recorded by such system and apparatus is disclosed. A reproduction apparatus is also disclosed which reproduces the information out of such recording medium.

Abstract: An encoder circuit utilizes a pair of digital memories clocked at a slower write than read rate to compact analog input data, blanking and synchronization pulse intervals, and generate NTSC video. The NTSC formatted data may be stored utilizing conventional NTSC tape or disc recording equipment or may be transmitted, duplicated, monitored or transcribed utilizing readily available NTSC video equipment. A decoder circuit is provided to reprocess the NTSC video formatted data and restore it to its original form by removing the synchronization and blanking intervals and, utilizing a pair of digital memories clocked at a faster write than read rate, re-stretch the data which was compacted in the time dimension by the encoder circuit.

Abstract: A sound generator for storing and reproducing audio signal with reduced memory storage, which is accomplished by: (a) the technique of Adaptive Differential Pulse Code Modulation (ADPCM), and (B) the elimination of silence period from memory storage but regenerating the silence signal at output.

Abstract: An improved video recorder/transmitter with expanded functionality including a capability for editing and/or copying from one video tape to another using only a single tape deck. The increased functionality is realized through the use of analog to digital conversion, signal compression and intermediate storage in an integrated circuit, random access memory. The recorder/transmitter has capabilities to transmit and receive program information in either a compressed or decompressed format over fiber optic lines.

Abstract: An information signal recording and/or reproducing apparatus, of the kind for recording or reproducing information signals on or from a tape-shaped record bearing medium which has a plurality of areas extending in parallel with each other in the longitudinal direction of the medium, is arranged to record or reproduce a first information signal with a first rotary head which traces the medium in such a way as to traverse each of the plurality of areas while rotating through an angle of .theta. degrees, and to record or reproduce a second information signal with a second rotary head which traces the medium by rotating at a phase differing by of n.theta. degrees, wherein "n" is an integer other than 0, from the rotation phase of the first rotary head.

Abstract: A magnetic recording and reproducing device comprises a rotary head incorporating plural heads having different azimuths and recording and reproducing an input signal by tracing a magnetic tape and a tape feeding drive device for feeding the magnetic tape. The tape feeding drive device feeds the magnetic tape during multiple speed reproduction with a tape feeding speed of about (N+1/2) times (where N is an integer) as high as a tape feeding speed during a normal speed reproduction. Positional relation of head trace to the track thereby is shifted by 1/2 track in each trace with a result that a section in which information such as sub-code can be read and a section in which it cannot be read are dispersed on time axis. This enables the information to be obtained substantially in real time.

Abstract: In a recording system, a sequence of image signals obtained from a sequence of images are used to generate and record a sequence of recordable signals on a read only memory. Efficient coding of the received sequence of image signals is carried out through the use of a given parameter which is adaptively and dynamically changed, preferably manually, through a parameter controller acting as the interactive device. The image signals are repeatedly subjected to the efficient coding process. The process uses a sequence of predictive signals to produce coded signals. The predictive signals are displayed on a monitor display device to be monitored by an operator. The operator changes the attributes of the parameter until an optimum image is obtained. The optimum parameter is stored on a magnetic tape.

Abstract: An information recording system and apparatus records on a recording medium an audio signal, which is time-base compressed at a predetermined compression ratio, together with a data signal indicative of the compression ratio. A start signal indicative of the start of the audio signal, the data signal, the audio signal and an end signal indicative of the end of the audio signal are recorded in this order. A recording medium recorded by such system and apparatus is disclosed. A reproduction apparatus is also disclosed which reproduces the information out of such recording medium.

Abstract: A recording and/or reproducing apparatus includes a plurality of time base changing elements arranged to perform band compression and expansion by altering the time base of an incoming signal; a switching circuit arranged to selectively change audio signals inputted into and outputted from these time base changing elements from one over to another; and a recording-and-reproducing circuit arranged to record and reproduce the band compressed audio signal on and from a recording medium.

Abstract: A rotary head type digital signal recording and/or reproducing apparatus wherein for 1/2 speed recording and/or reproducing from a magnetic tape, a tape feed speed is decreased to 1/2 times the normal speed, and a recording/reproducing interval becomes 2 times that of the normal mode of operation utilizing at least two rotary heads mounted at adjacent positions on a rotating cylinder with one of the rotary heads having a plus azimuth angle and the other having a minus azimuth angle. For 2 times speed recording/reproducing, a tape feed speed increases to 2 times the normal speed, and a recording/reproducing interval becomes 1/2 that of the normal mode of operation utilizing at least two rotary heads mounted on a rotating cylinder at opposite positions of a rotary axis of the cylinder, with one of the two rotary heads having a plus azimuth angle and the other having a minus azimuth angle.

Abstract: Pauses present in an input audio signal are detected and digitally encoded to represent the length of each pause. The audio signals are recorded; but the pauses included therein are replaced by respective pause encoded signals, thereby compressing the audio signals. When the compressed audio signals are played back, each pause encoded signal is sensed and is replaced by a pause whose length is derived from the encoded signal.

Abstract: In an apparatus for reproducing a digital signal wherein a signal is read by a plurality of reproducing rotary heads which trace a track with an interval narrower than the interval of tracks formed on a tape, a wrap angle with which a tape is wrapped around the periphery of a rotary drum to which the rotary heads are attached is selected to be less than 360.degree./n with respect to the number n (n is an integer) of rotary heads, the rotary heads are rotated at a speed twice the normal rotational speed of the heads, the demodulated digital signal is stored in a memory corresponding to a frame address and a block address detected from the reproduced digital signal, and then the digital signal stored in the memory is read out therefrom in a predetermined order, whereby an apparatus for correcting the tracking of the tape by the rotary heads can be eliminated.

Abstract: A method and system for recording an asynchronous, biphase encoded signal (such as a MIL-STD-1553B signal), having a first data rate, on a video tape recorder, which may be a consumer video tape recorder, and for recovering the encoded recorded data for subsequent transmission in its original format. The asynchronous biphase enceded signal is synchronized with a clock signal having frequency equal to twice the first data rate. The synchronized signal is then stored temporarily in a buffer memory as if it were an NRZ bit stream having bit rate equal to twice the first data rate. The data is read out of memory and combined with television-type synchronization pulses to produce a television-type signal for recording on the VTR. In the play back mode, the recorded VTR signal is separated into its data component (which consists of bursts of data that occupied the active video areas) and sync component. The invention eliminates the need to use specially designed recorders for asynchronous biphase encoded signals.

Abstract: A digital information signal recording apparatus has a first mode in which a digital information signal of one channel is recorded on a recording medium at a given bit rate and a second mode in which digital information signals of n channels (n: an integer which is at least 2) are simultaneously recorded on the recording medium at a bit rate which is 1/n of the given bit rate.

Abstract: A digital signal recording and reproducing apparatus comprising a dynamic range compression/expansion apparatus. The compression/expansion apparatus receives a digital signal from, for example, an analog-to-digital converter and compresses the dynamic range of the digital signal and the so compressed digital signal is supplied to a recording signal processing circuit in the recording operation mode, while the apparatus receives a digital signal reproduction output from a recording/reproducing head and expands the dynamic range of the reproduced digital signal and the so expanded digital signal is supplied to, for example, a digital-to-analog converter in the reproducing operation mode.

Abstract: A method and apparatus for suppressing spurious audio frequency sounds in a system in which electrically represented audio frequency sounds are very significantly raised in frequency and are conformed to a video line signal format. A sufficient number of guard samples ("M") are included at the beginning of each line of electrically represented audio frequency sounds to allow the amplitude response of the video line signal to reach the specified value prior to the occurrence of the samples that are used. The additional guard samples are provided by RAM memory (3), which is controlled by state machine (4). Fewer additional guard samples ("K") may be provided at the end of a video line to enhance tolerance to small timing variations.