IEC60601-1-8 Audible Alert Generator
IEC60601-1-8 Audible Alert Generator
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Import programmbed_audio_alert
IEC60601-1-8 Audible Alert Generator
Last commit 18 May 2012 by 
Wim Huiskamp
Library
Import programmbed_audio_alert
IEC60601-1-8 Audible Alert Generator
Last commit 18 May 2012 by Wim Huiskamp
Datasheet
http://www.nxp.com/documents/application_note/AN10875.pdfNotes
NXP has published an application note (AN10875) on the generation of audible alert signals that comply with the IEC60601-1-8 standard. The application note provides example code for the LPC1768. The algorithm generates tone sequences consisting of a basic frequency and 4 harmonics. Each note has a rising and falling amplitude slope.
There are 8 basic alarms in high and medium priority modes. In addition a general low priority alarm is also available. The high priority alarms consist of a 5 tone sequence that is repeated twice. The medium priority alarms consist of 3 tones that are repeated only once.
The tones are not stored samples, but they are generated on the fly using the Goertzel algorithm. The samplerate is 25 KHz and the DAC output (p18) provides the analog soundoutput.
More information is here
NXP Application Note AN10875 http://www.nxp.com/documents/application_note/AN10875.pdf
NXP Documentation http://ics.nxp.com/support/design/microcontrollers/iec.alarm/pdf/documentation.pdf
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