User's Manual

LS5B User Guide
Libre Wireless Technologies User Guide: LS5B, Ver. 2.9 Page 78 of 78
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7.24. Dynamic Output Sampling Frequency
Dynamic Output Sampling Frequency enables the output sample rate of the speaker to be
changed according to the audio track sample rate. To enable this feature, the NV-item to be
used is outputfs (Refer NV-item document available in Libre Portal). The sample rates to be
supported should be mentioned in the NV-item value.
For example,
# setenv outputfs 44100,48000,88200,96000,176400,192000
#Rebbot
When the audio track is being played, the sample rate of the track is matched from the values
listed in the NV-Item outputfs. If the sample rate is not present, the nearest lower value from
the values listed is selected to play the track.
1 This sample rate is then informed to the HOST-MCU over LUCI message-box
230 (Refer to LUCI Tech Note available in Libre Portal),to use this sample rate
to configure the DAC.
2 LS speaker then waits for a response from the HOST-MCU.
3 After HOST-MCU has configured DAC response should be sent immediately to
LS5B/LS9 over the same LUCI message-box 230 with data "success" and then
the playback will begin.
HOST-CODED is the I2S Master.
IF HOST-CODEC is I2S Slave , then LS device only informs the HOST-About the
changed sample rate.