Verifying speaker operation during alarm generation

Details Verifying speaker operation during alarm generation Verifying speaker operation during alarm generation

2011-03-22

2011-03-22

La, Anh V (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S657000, C340S664000

Reexamination Certificate

active

07911353

ABSTRACT:
The patent discloses a method of verifying that a dialysis machine audio alarm has been sounded. The method senses a waveform of electric power, such as a waveform of the current or voltage that drives a speaker. When the speaker produces sound, power consumption changes the waveform in a manner that is detectable by electrical and electronic sensors. The amplitude envelope and frequency or period of the waveform is specific to the electrical and mechanical characteristics of the speaker. The waveform may be detected by a current-sensing resistor in series with the speaker power source, by a non-contact current transformer or hall-effect sensor, or may be sampled by an ADC. A computer program then compares this resulting signal to an expected signal or waveform and verify the speaker is working. If the speaker is not working, the machine sends a visual alarm or places itself in a safe state.

REFERENCES:
patent: 4037222 (1977-07-01), Solomon
patent: 4881058 (1989-11-01), Berry, III
patent: 5736927 (1998-04-01), Stebbins et al.
patent: 6094134 (2000-07-01), Cohen
patent: 6462652 (2002-10-01), McCuen et al.
patent: 6545533 (2003-04-01), Karki et al.
patent: 7106193 (2006-09-01), Kovach
patent: 2003/0073408 (2003-04-01), Harrell et al.
patent: 2007/0146127 (2007-06-01), Stilp et al.
patent: 0715425 (1996-06-01), None
patent: 2390908 (2004-01-01), None
International Search Report and Written Opinion for International Application No. PCT/US2009/045784 mailed on Nov. 12, 2009.

Affiliated with

Also associated with

Rating

Verifying speaker operation during alarm generation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Verifying speaker operation during alarm generation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Verifying speaker operation during alarm generation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2624277