| 摘要 |
PURPOSE:To make recording and reproducing possible when a sound sampling frequency is not integer times of the frequency of a video vertical synchronizing signal, by applying time-axis compression to a sample of sound signals and producing and recording dummy samples including the information of the number of sound samples of each field. CONSTITUTION:When signals obtained by sampling and quantizing sound signals at 48kHz are recorded on a VTR, the number of samples per field goes to 4,004, since vertical synchronizing signals are 60X1,000/1,001Hz. The 4,004 samples are straddled to the 1st-5th fields in the order of 800, 801, 801, 801, and 801. Then time-axis compressed signals are recorded by adding dummy samples of the four- sample quantity to the field of 800 samples and those of the three-sample quantity to the fields of 801 samples. At the time of reproduction, error correction is performed by an error correcting signal in accordance with error detecting information and, at the same time, a signal train composed only of sound samples and dummy samples is formed by deinterleaving process (operation completely opposite to interleaving process at the time of recording) and the dummy samples are then removed so as to produce a continuous signal train composed only of sound signals. |
