Methods for generating auditory indicators

Details Methods for generating auditory indicators Methods for generating auditory indicators

1983-07-20

1987-02-17

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Ultrasonic pest control

340521, G08B 300

Patent

active

046443274

ABSTRACT:
Existing auditory warning systems are in general too loud and it is often difficult to distinguish between a number of different warnings. Further under different conditions warnings may change character due to masking by varying noise. A warning system is disclosed which is based on a microprocessor and waveforms for each warning sound stored in a ROM. The waveforms are read out to DACs and used to drive a loudspeaker by way of programmable attenuators. Each waveform is devised to have at least four quasi-harmonically related frequency components at a power level in the range 15 to 30 dB above threshold. In this way the sounds are distinctive and do not change character with varying noise levels below threshold.

REFERENCES:
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patent: 4090349 (1978-05-01), Takase
patent: 4280123 (1981-07-01), Right et al.
patent: 4359713 (1982-11-01), Tsunoda
patent: 4417218 (1983-11-01), Berke
Elektor, vol. 5, No. 6, Jun. 1979, pp. 6-12 to 6-16, "Programmable Doorbell".
Patterson et al, "The Appropriate Sound Level for Auditory Warnings on Civil Aircraft", prepared at the meeting of the Acoustical Society of America, Atlanta, Georgia, Apr. 1980.
Patterson, "Auditory Filter Shapes Derived with Noise Stimuli", J. Acoust. Soc. Am., vol, 59, No. 3, Mar. 1976, pp. 640-654.

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