Audio digital recording and playback system

  • US 4,636,876 A
  • Filed: 09/17/1984
  • Issued: 01/13/1987
  • 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 signals in digital data form comprising:

  • converting means for converting an analog signal into at least three digital data streams, wherein the first of said digital data streams is a reference signal representative of the amplitude of a preselected range of frequencies in a relatively broad band width, and wherein the second of said data streams is produced by filtering the analog signal to produce a data stream indicative of a plurality of discrete frequencies encompassed by the bandwidth represented by said first data stream; and

    wherein the third of said digital data streams is a reference signal representative of the amplitude of the analog signal for each of said plurality of discrete frequencies;

    sampling means for producing a sequential stream of digital data 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 predetermined portions of said digital data samples;

    means for comparing said predetermined portion of said first reference data stream containing amplitude data with said predetermined portion of said second reference data stream containing frequency data to produce frequency spectrogram data representative of the frequency and amplitude of the original analog signal;

    means for transforming said predetermined portion of said digital data samples selected from said third data stream into data representative of a time versus amplitude histogram for each discreet frequency;

    means for providing selected waveform parameters;

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

    means for sequentially assembling and storing said frequency spectrogram data and said amplitude reference data of said first data stream and said addressable waveform data for subsequent use.

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