Abstract: A digital audio signal processing apparatus for creating coded edited data by insertion of second coded audio data coded in block units not synchronized with frames and fields into first coded audio data coded in block units also not synchronized with the frames and the fields at a request made by a command signal synchronized with the frames or the fields comprises coding means for creating the first and second coded audio data, and switching means for receiving the first and second coded audio data whereby selective switching of the first coded audio data and the second coded audio data from one to another is carried out at a location selected among a position specified by the command signal and positions before or after the specified position when the selected location coincides with a boundary between two consecutive coded blocks of the first and second coded audio data.

Abstract: A data processing apparatus for encoding data in which first information data from a first source of information data is supplied together with a reference timing value and subsequently a plurality of successive sources of information data of a predetermined processing unit are input when said first information data is finished being supplied. The data processing apparatus produces an encoding start point for the successive sources of data, as a function of a phase difference value between a predetermined reference timing value obtained before the successive sources of information data are input and a start point of the successive processing unit.

Abstract: A system for performing insertion editing on the audio portion of an audio-visual signal; wherein the video portion of the signal is coded in field/frame units, and the audio portion of the signal is coded in block units which are not synchronized with the field/frame units. The system allows the block units of audio to be insertion edited according to a command that is synchronized with the field/frame units of video--despite the non-synchronous relationship between the block and field/frame units. Audio editing is implemented through a switching scheme that adjusts the audio insertion begin point and end point to account for differences between the block unit and field/frame unit boundaries.

Abstract: A synchronizing signal generating apparatus generates a synchronizing signal from digital data in which a synchronizing signal formed of a fixed data pattern having a predetermined bit number is inserted at a predetermined time interval L.

Abstract: The present invention is directed to a digital data error correcting apparatus in which an error correction capability can be considerably improved in a digital signal transmission system when a digital modulation code is decoded. In a minimum distance decoding method, when a plurality of reference samples having equal minimum Hamming distance relative to a digital modulation code exist, on the basis of the probability that an error will occur in the respective bits, respective bits are weighted, and a reference sample having the minimum distance from the input sample is selected from a plurality of reference samples to thereby correct an error. Further, the present invention is directed to a digital sync. detection apparatus in which an ability for detecting a sync. pattern can be considerably improved without degrading the probability that a pseudo-sync. signal will occur. A detection interval of a predetermined cycle is set in a sync.

Abstract: A digital modulation system is disclosed in which a string of input data is divided at intervals of 8 bits and the resulting 8-bit data words are converted into 16-bit modulated digital code data words. Code conversion is made so that the resulting 16-bit modulation code words have two or more consective digits between the 2nd and the 15th bits, five or less consecutive digits between the 1st and the 16th bits, four or less consecutive digits between the 13th and the 16th bits, the absolute value of the CDS of all 16 bits in each modulation code block is not more than 4 and the absolute value of the DSV from the leading bit to an arbitrary bit in each modulation code block is not more than 5. Also, the number of consecutive digits in any portion of the digital data is not less than 2 and not more than 5 and the absolute value of the DSV is not more than 3 from the beginning of the coded data stream to any point therein. An error rate more favorable than the M.sup.

Abstract: The present invention is concerned with a magnetic recording apparatus, such as a video tape recorder, in which the recording circuit, provided with an amplifier connected to a magnetic head, is provided on the side of a rotary head drum. The record control signals for controlling the recording circuit are indicated by serial data and data enable signals indicating the data start and data end points of the serial data. The edge pulses of sync clocks of the serial data are gated by the data enable signals and connected to the serial data, and the transmission mode signals indicating the start and the end of the transmission are further annexed to serial transmission data to form serial control signals, which are then serially transmitted as record control signals from outside of the rotary head drum to the side of the rotary head drum from outside the rotary head drum for simplifying the transmission system for the record control signals.

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 digital code modulation circuit converts input data formed of sequentially received serial data into parallel data such that each parallel data has input data for reference in both preceding and following parallel data, and thereupon applies a code conversion to the parallel data and thereby executes modulation of the input data in parallel. Conversely, a digital code demodulation circuit applies a code conversion to input data formed of serial data sequentially input thereto to form parallel data such that each parallel data has input data for reference in both the preceding and following parallel data and thereby executes demodulation of the input data in parallel.