EEG With audio output
First Claim
1. A method for generating a sound output signal representing a brainwave comprising:
- establishing a first signal representing a brainwave;
selecting a multiplicity of sequential brainwave segments of said first signal, each brainwave segment lasting for a particular duration; and
generating a sound output signal comprising a series of output segment signals, each output segment signal comprising a plurality of replica signals in sequence wherein each replica signal has a duration which is a fraction of the duration of a corresponding segment of the first signal, and wherein each replica signal is a waveform which is substantially geometrically similar to the waveform of the corresponding segment of the first signal.
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Abstract
A method is described for generating sounds (which are of a musical nature) that are related to the state of a person'"'"'s brain, which is useful in anesthesiology and other applications. A brain wave signal, which may be derived from an electroencephalograph, is converted in real time from an analog to a digital signal, and stored in a memory. An epoch delineator detects points along the signal which can define segments of the signal. The signals in the memory are read out in segments, with the segment signals repeatedly read out N number of times and at a rate N times faster than the input rate to the memory, to generate a train of signals that are high frequency replicas of the segment. Thus, the multiple replicas of the segment are all read out during the same time period required to originally store the segment, and after each segment is read out the next segment to be stored is repeatedly read out. In one system, a segment ends when the filtered brainwave signal crosses a zero voltage level in a positive-going direction.
23 Citations
11 Claims
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1. A method for generating a sound output signal representing a brainwave comprising:
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establishing a first signal representing a brainwave; selecting a multiplicity of sequential brainwave segments of said first signal, each brainwave segment lasting for a particular duration; and generating a sound output signal comprising a series of output segment signals, each output segment signal comprising a plurality of replica signals in sequence wherein each replica signal has a duration which is a fraction of the duration of a corresponding segment of the first signal, and wherein each replica signal is a waveform which is substantially geometrically similar to the waveform of the corresponding segment of the first signal. - View Dependent Claims (2, 3, 4, 5)
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6. A method for generating a sound output signal representing a brainwave comprising:
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establishing an analog first signal representing the filtered electroencephalograph of a person; converting said analog first signal into digital signals at a constant rate; storing said digital signals in a memory; and reading out the digital signals stored in said memory, in segments, including repeatedly reading out the same segment a predetermined number N of times, with the period during which each segment is read out being 1/N times the period of time during which the signals representing the segment were stored in said memory, and then repeatedly reading out the segment which was next stored in the memory. - View Dependent Claims (7)
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8. A method for processing an EEG signal representing brainwaves, comprising:
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detecting locations along said signal which cross a predetermined magnitude in a predetermined direction, with two of such detections, one occurring after the other, representing an input segment; and generating a sound output signal which includes a plurality of output segments, each output segment including multiple identical replica signals in sequence, each replica signal having a waveform which is similar in form to a corresponding input segment, but each replica signal has a duration which is a fraction of the duration of the corresponding input segment.
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9. Apparatus for processing an EEG signal representing a brainwave, comprising:
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means for establishing a first signal representing a brainwave; means responsive to said first signal for defining segments of said first signal; and means for generating a sound output signal comprising a series of output segments that each comprise a plurality of replica signals in sequence, wherein each replica signal has a duration which is a fraction of the duration of a predetermined segment of the input signal, and wherein each replica signal has a waveform which is geometrically similar to the waveform of the predetermined segment of the first signal. - View Dependent Claims (10, 11)
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Specification