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US 4,419,544 AGranted
Signal processing apparatus
OwnerRoger A. Adelmaninventor
Life of this patent
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Abstract
A generalized signal processing device for use as a hearing aid generates and modifies signals representative of acoustic patterns in a physiologically compatible manner which enables persons suffering from various auditory pathologies to recognize sound patterns including human speech.
Claims7
A signal processing apparatus for modifying acoustic patterns, comprising:
- (a) means for receiving an acoustic signal and generating a processed signal in response thereto, said generated processed signal being representative of the acoustic signal;
- (b) adaptive noise cancelling means associated with said receiving and generating means for suppressing portions of said generated signal which do not exceed a predetermined pattern recognition function, and producing an output signal characteristic thereof;
- (c) frequency band separating means for dividing said generated signal into at least two separated signals in accordance to frequency;
- (d) means for selectively transposing the frequency of at least one of said separated signals separated by said frequency band separating means;
- (e) means for providing temporal matching of said separated signal;
- (f) means for summing the temporally matched signals into a resultant signal;
- and
- (g) means for converting said amplified signal into an acoustic signal.
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An apparatus for minimizing transitional discontinuities arising from the joining of originally discontiguous signal segments, comprising:
- (a) means for comparing the magnitude of the trailing edge of a first signal segment with the magnitude of the leading edge of a succeeding signal segment;
- (b) means for determining the rate of change of said first signal segment's magnitude at the trailing edge;
- (c) means for determining the rate of change of said succeeding signal segment's magnitude at its leading edge;
- and
- (d) means for generating an output signal upon the substantial correspondence of both the magnitude and rate of change of said trailing edge of said first signal segment with the magnitude and rate of change of said leading edge of said succeeding signal segment.
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Dependencies are inferred from the claim text.