Digital video and audio file system
First Claim
1. A digital video file system comprising:
- a high efficiency encoder circuit for converting an analog TV signal into a digital TV signal;
a buffer memory circuit for temporarily storing the digital TV signal;
a digital signal processing circuit coupled to the output of the buffer memory for reducing in the digital form a redundancy of the digital TV signal in the amplitude direction in a code differential manner;
a digital variable length encoding circuit coupled to the output of the digital signal processing circuit for generating a digital variable length output coded TV signal from the output signal of the digital signal processing circuit; and
a large-capacity digital recorder coupled to the digital variable length encoding circuit for recording the digital variable length output coded TV signals.
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Accused Products
Abstract
A digital video and audio file system is provided for use in systems such as a center-to-end video communication system. In the file system, video information, such as a color television video signal, is digitized in such a manner that it is separated into a luminance (Y) signal and a carrier chrominance (C) signal and these separated components are processed by the code differential method and the variable length encoding method. The digital signal thus digitized is recorded in a digital recorder. On the other hand, audio information is digitized by the AD-PCM encoding method and recorded in the same recorder. In encoding the video and the audio information, a part of hardware is used in common for both the signals, thus saving the hardware of the file system.
68 Citations
12 Claims
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1. A digital video file system comprising:
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a high efficiency encoder circuit for converting an analog TV signal into a digital TV signal; a buffer memory circuit for temporarily storing the digital TV signal; a digital signal processing circuit coupled to the output of the buffer memory for reducing in the digital form a redundancy of the digital TV signal in the amplitude direction in a code differential manner; a digital variable length encoding circuit coupled to the output of the digital signal processing circuit for generating a digital variable length output coded TV signal from the output signal of the digital signal processing circuit; and a large-capacity digital recorder coupled to the digital variable length encoding circuit for recording the digital variable length output coded TV signals. - View Dependent Claims (2, 3, 4, 9, 10, 12)
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5. A digital video and audio file system comprising:
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a high efficiency encoding circuit for converting an analog TV signal into a digital TV signal; an encoding circuit for converting an audio signal with a fixed time length into a digital audio signal; a buffer memory circuit for temporarily storing the two kinds of digital signals derived from both said encoding circuits; a digital signal processing circuit coupled to the output of the buffer memory for reducing in the digital form a redundancy of the digital TV signal in the amplitude direction in a code differential manner; a large capacity digital recorder coupled to said digital processing circuit output for recording the digital TV and digital audio signals; a by-pass circuit coupled between said buffer memory and said recorder to allow bypassing of said digital signal processing circuit for the digital audio signals stored in said buffer memory which do not need processing in said digital signal processing circuit; and a signal control unit for controlling signals transferring between said digital recorder and said digital processing circuit and said buffer memory. - View Dependent Claims (6, 7, 8, 11)
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Specification