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Audio and video digital recording and playback system

  • US 4,682,248 A
  • Filed: 09/17/1985
  • Issued: 07/21/1987
  • Est. Priority Date: 04/19/1983
  • Status: Expired due to Term
First Claim
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1. A microcomputer recording system for recording analog audio and video signals in digital data form comprising:

  • converting means for converting an analog audio signal into a multiplicity of digital data streams wherein at least one of said data streams is a relatively broadband reference signal representative of the amplitude of a preselected range of audio frequencies, and wherein another of said data streams is produced by filtering the analog audio signal to produce a data stream channel indicative of a plurality of discrete frequencies encompassed by the bandwidth represented by the first data stream; and

    wherein another of said digital data stream is a reference signal representative of the amplitude of the audio signal for each of plurality of discrete frequencies;

    sampling means for producing a sequential stream of samples in each of said digital data streams,selection means for selecting a predetermined portion of the digital data samples produced by said sampling means in each digital data stream;

    means for separately storing each of said selected data samples produced by said sampling means;

    means for comparing the reference data stream containing amplitude data with the reference data stream containing frequency data to produce frequency spectrogram data representative of the frequency and energy of the original audio signal;

    means for comparing said histogram data with selected waveform parameters and producing addressable data representative of the waveform of the original input data;

    means for sequentially assembling and storing the frequency spectrogram data and the amplitude reference data and the addressable waveform data for subsequent use; and

    converting means for converting an analog video signal into a multiplicity of digital data streams wherein the first of said digital data streams is a sequential time code representative of the beginning of each video frame, andwherein another of said digital data streams is produced by filtering the analog time domain signal to produce a data stream channel indicative of chrominance; and

    wherein another of said data streams is indicative of brightness; and

    wherein another of said digital data streams is indicative of pixel spatial relationships; and

    wherein another of said data streams is indicative of the temporal frame to frame relationships; and

    coding means for receiving each data stream individually, said coding means including means for mathematically transforming each digital data stream into modified data streams each capable of being subsequently analyzed by comparison of the chrominance, brightness and spatial factors present respectfully in said modified data streams, andmeans for selecting predetermined data bits from each of said modified data streams after comparison, in a sufficient amount to reconstruct each chrominance, brightness and spatial factors for video presentation, andmeans for storing said digital data bits for retrieval.

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