Abstract: In transmission of PCM signals resulting from sampling and quantizing analog signals, the PCM signals are modulated according to a desired rule of modulation and a synchronizing interval is provided for every given interval of time, the synchronizing interval being longer than a level change interval as determined by the modulation rule. The synchronizing interval is followed by a level reversal interval which is approximately equal to the longest level change interval as determined by the modulation rule.

Abstract: A PCM recording and reproducing apparatus provided with an overdubbing function includes an error-correcting device employing error-correcting redundant signals recorded apart from the audio tracks. The apparatus functions to prevent error correction when the use of the redundant signals would cause the audio tracks to be corrected in error.

Abstract: A binary data encoding process comprises the steps of separating a given binary data sequence at every two bits by a serial/parallel shift register (18), and converting the separated 2-bit data into a 3-bit code by using a logic circuit (19) and a parallel/serial shift register (20). A conversion pattern in the logic circuit (19) is exclusively determined based on the 2-bit data to be converted, 1-bit data immediately before and 2-bit data immediately after said 2-bit data, and a 3-bit code converted immediately before the conversion of said 2-bit data, wherein a succession of at least one but no more than seven "0" exists between an arbitrary "1" and the succeeding "1" in the converted 3-bit code sequence.

Abstract: A PCM recording and reproducing device is improved by providing an apparatus for positively obtaining the reference phase reproduction signal by ANDing a plurality of synchronization marks from a plurality of tracks. In over-dubbing, portions to be recorded are delayed slightly so as to either lead or lag signals on previously recorded tracks.

Abstract: A PCM record reproducer comprises a coder circuit for forming PCM signals by adding error detection codes to data signals in a predetermined pattern; a splice detection circuit for determining a splice point of a magnetic tape by finding inconsistency of the detected result of said error detection code depending upon said PCM signals read-out from said magnetic tape in which said PCM signals are recorded; and an editing circuit for editing said PCM signals when the splice point is determined by said splice detector circuit.

Abstract: An apparatus for reproducing voice signals from a PCM magnetic recording tape which is equipped with a discontinue waveform calibrator which comprises a control signal generator for detecting an edited part from PCM signal rows reproduced from the magnetic tape and for transmitting a control signal; a first memorizing means for memorizing at least one word part of the PCM signal rows which are sequentially imputted; a second memorizing means for memorizing specific words of the PCM signal rows overflowed from the first memorizing means; a third memorizing means for memorizing at least one word part of the PCM signal rows overflowed from the memorizing means; a first weighing means for multiplying a gradually increasing weight from X0 to X1 to the memorized data of the first memorizing means upon receiving the control signal to output it; a second weighing means for multiplying a gradually decreasing weight from X1 to X0 to the memorized data of the third memorizing means upon receiving the control signal; an

Abstract: Upon reproducing a PCM audio signal, the disclosed weighting circuit gradually changes the weight or value of signal bits constituting the PCM audio signal in accordance with a command signal so as to vary gradually a level of a reproduced analog audio signal corresponding to the PCM audio signal.

Abstract: An editing system for reproduction of coded voice signals including means for smoothly connecting signals in front and back of a connecting part to prevent a click sound caused by the sudden level change of the reproduced sound produced by the connecting part in editing of a PCM signal tape on which the PCM signal is recorded. With such means, the click sound produced at the connecting part can be eliminated either from a hand cutting edition or an automatic electronic edition and the reproduction of the PCM signal after the edition of the PCM signal can be precisely performed.