Method and apparatus for repetitively producing a noise-like audible signal

Apparatus for repetitively producing a noise-like audible signal, comprising:

• a light source and an audible signal source,
• means for repetitively generating at a first adjustable frequency bursts of digital pulses, said pulses within said burst having a second higher adjustable repetition frequency,
• pink noise filter means connected to said pulse burst generating means for substantially attenuating all frequencies of said repetitive bursts of digital pulses above a first cut-off frequency and for accentuating a preselected range of lower frequencies,
• tunable band pass filter means connected to said pink noise filter means for repetitively generating noise-like pulses of varying amplitude, said tunable band pass filter means having a center frequency which is adjustable over a preselected range of frequencies which correspond to the frequencies optimally detectable by the average human ear, said noise-like signal having a frequency component accentuated at approximately said center frequency,
• low pass filter means connected to said pink noise filter means for generating a train of pulses having a repetition frequency within said preselected range of lower frequencies, and
• means connected to said tunable band pass filter means and said low pass filter means for driving said light source with said train of pulses having a repetition frequency preselected range of lower frequencies and for simultaneously driving said audible signal source with said noise-like train of pulses.

A method of repetitively producing a noise-like audible signal, comprising:

• repetitively generating at a repetition first frequency bursts of digital pulses, said pulses within each burst having a second higher repetition frequency,
• generating a first repetitive signal based on said repetitive bursts of digital pulses wherein all frequencies of said repetitive bursts above a first cut-off frequency are substantially attenuated and a preselected range of lower frequencies is accentuated,
• generating a second repetitive noise-like signal based on said first repetitive signal wherein all frequencies within a preselected band pass within the range of frequencies optimally detectable by the average human ear are substantially accentuated, said second repetitive noise-like signal having a strong pulsating component at a preselected frequency within said band pass, and
• driving an audible signal source with said second repetitive noise-like signal.

A method of repetitively producing a noise-like audible signal, comprising:

• repetitively generating at a repetitive first frequency bursts of digital pulses, said pulses within each burst having a second higher repetition frequency,
• generating a first repetive signal based on said repetitive bursts of digital pulses wherein all frequencies of said repetitive bursts above a first cut-off frequency are substantially attenuated, and a preselected range of lower frequencies is accentuated
• generating a second repetitive noise-like signal based on said first repetitive signal wherein all frequencies within a preselected band pass within the range of frequencies optimally detectable by the average human ear are substantially acccentuated, said second repetitive signal having a strong pulsating component at a preselected frequency within said band pass, and
• generating a third repetitive signal based on said first repetitive signal having a frequency in the range of approximately 0.5 hz to 12 hz, and
• simultaneously driving a light source with said third repetitive signal and an audible signal source with said second repetitive noise-like signal.