Lisa Compact
92
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Immediately after power on: Start from the last played entry
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When executing play-playlist task and when switching between playlists: Start from the first entry
in the playlist
21.5
The audio buffer
For streaming applications, the Lisa has a buffer of 1.5MB. The streaming algorithm in the Lisa tries to
fill the buffer to its maximum. The time it takes to fill the buffer to the maximum level, depends mainly on
the streaming server configuration and the quality (data rate and reliability) of the stream.
The more data available in the buffer, the longer the Lisa can keep playing in case of a network issue
(e.g. network unavailability or limited bandwidth). The time that the Lisa can survive a bad network
situation, depends mainly on the buffer level when the problems starts and the quality (bit rate) of the
audio stream.
The time a Lisa can keep playing audio from the buffer while the stream is not available, can be
calculated as follows:
Example: If the buffer of the Lisa is filled completely (1.5 times 1024 kilobytes = 1536 kilobytes) and the
Lisa plays a 128 kbps stream, the time the Lisa can keep playing without internet connection would be:
21.6
Power off
The Lisa can power down and the state of the device is then best described as 'standby'. Although the
playback of music stops and the display is switched off, several functions keep operating. In particular
the monitoring and task scheduler keep working. So, a task to power up is both executed as well as
reported through the monitoring.
21.7
Supported audio formats and streams
The Lisa devices support the following audio formats: MP3, OGG, AAC+. Please note that depending on
the type of Lisa you have, not all formats are supported. All Lisa devices support MP3, see
for more details.
