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annotate aud-fcdev3b/spkr0.src @ 12:b57c380d78e7

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aud-fcdev3b/README: explanation of new vs. historical configs
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 09 Oct 2021 04:26:59 +0000
parents 46f49aa6ab8c
children
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46f49aa6ab8c aud-fcdev3b: new spkr0 config with AEC and mic tuning
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1 # The official voice call kit for FCDEV3B consists of a SparkFun COM-09151
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2 # loudspeaker and a CUI CMC-9745-130T microphone. The present audio mode
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3 # config has been tuned as follows:
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4 #
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5 # 1) AEC is enabled as needed for all not-held-to-ear loudspeaker setups;
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6 #
46f49aa6ab8c aud-fcdev3b: new spkr0 config with AEC and mic tuning
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7 # 2) The microphone gain has been tuned to provide the most natural
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8 # voice levels to parties on the far end of the call, matching standard
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9 # phones;
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10 #
46f49aa6ab8c aud-fcdev3b: new spkr0 config with AEC and mic tuning
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11 # 3) The sidetone level has been turned down: the default -5 dB is too loud
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12 # and causes singing effects with the raised microphone gain.
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14 mic default {
46f49aa6ab8c aud-fcdev3b: new spkr0 config with AEC and mic tuning
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15 gain 8 # tuned for CMC-9745-130T and FCDEV3B mic input circuit
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16 output-bias 0 # 2.0V appears to be correct for CMC-9745-130T
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17 # Mic has very flat frequency response, thus no FIR needed
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18 }
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46f49aa6ab8c aud-fcdev3b: new spkr0 config with AEC and mic tuning
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20 # We don't have a FIR filter for our SparkFun COM-09151 loudspeaker. There is
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21 # no datasheet for this speaker on SparkFun website, thus we don't know its
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22 # frequency response curve, and even if we got the needed data, the work to
46f49aa6ab8c aud-fcdev3b: new spkr0 config with AEC and mic tuning
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23 # create a flattening filter would probably be more than we can justify.
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25 speaker ear {
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26 gain 0 # left at default for now
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27 }
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29 # The canon seems to be to disable the sidetone altogether in loudspeaker
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30 # setups, but we set it to the lowest level instead, so we keep exercising
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31 # this chipset feature - our FCDEV3B is unusual in that the loudspeaker
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32 # is the only way to exercise voice calls.
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34 sidetone -23
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36 # The AEC configuration has been copied from Pirelli DP-L10, or more
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37 # specifically, Pirelli's loudspeaker mode AEC config. Unfortunately
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38 # we lack sufficient Calypso DSP documentation to even understand most
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39 # of these tunable settings, let alone actually tune them, hence
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40 # copying Pirelli's config is the best we can do at the moment.
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42 aec-new 2 1 0x14 0xCCC 0xFFF 0x4000 0x32 0x1000 0x1000 0 4 0x60