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Chapter 14: Audio
Sound Hardware
163
Psion Mobile Devices Developers Guide
14.1 Sound Hardware
Psion computers can have beepers and/or speakers. Beepers, which are capable of providing louder sounds
than speakers, are useful in environments with high background noise levels. Speakers play waveform
audio. Beepers and speakers are available as follows:
14.2 Playing Beeps Using the Mobile Devices SDK
On devices that have both a beeper and a speaker, when an application plays a beep using the Mobile
Devices SDK Beeper API, it is played on the beeper and no attempt is made to play it on the speaker. The
Beeper API first attempts to use the Psion beeper driver. If it is not found, the tone is simulated through the
speaker using the Microsoft WAVE API.
The following table defines the valid ranges for parameters that define beeps in the Mobile Devices SDK:
1
On devices with beepers only, this value is overridden by the volume setting in the GUI and has no effect.
The volume value specified in the API call is only used on devices with waveform audio support through a
speaker.
14.3 Playing WAV Audio Format Files Using the Mobile Devices SDK
The Mobile Devices SDK enables the playing of WAV audio format files on computers that have a speaker.
Any valid WAV file that fits into memory can be played. Psion speakers can play all audible frequencies.
WAV files are played by specifying one of the following:
A WAV file.
A WAV file contained in a resource file—a JAR file or a ZIP file.
Computer Beeper Speaker
7530 Yes Yes
7535 Yes No
8515 Yes No
8525 Yes No
8530 Yes No
Ikôn (7505) No Yes
NEO (PX750) Yes No
Workabout Pro (7525) No Yes
Workabout Pro G2 (7527) Yes Ye s
Workabout Pro 3 (7527) Yes Yes
Omnii XT10 (7545XV) Yes Yes
Omnii XT15 (7545XA) Yes Yes
Omnii RT15 (7545XC) Yes Yes
EP10 (7515) No Yes
Parameter Range
Frequency Range (Hz) 800 to 3000
Beep Duration (ms) 1 to 2000
Volume (% of maximum)
1
0 to 100
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