Patents Assigned to Allophonix, Inc.
  • Multi-state speech encoder and decoder
    Patent number: 4704730
    Abstract: Audio signals are analyzed for predictable components (reflection coefficients) and non-predictable (residual) components. The original signal state, over a short-term interval of samples (packet) is defined as one of four states: Silence, Hiss, Sigma, or Peaky. The state determines the step-size encoding of the residual quantized signal, which can therefor be encoded more efficiently.
    Type: Grant
    Filed: March 12, 1984
    Date of Patent: November 3, 1987
    Assignee: Allophonix, Inc.
    Inventors: John M. Turner, Dana J. Redington