2010/5/25 Clemens Ladisch <clemens@xxxxxxxxxx> > Raymond Yau wrote: > > I have doubt about DECLARE_TLV_DB_LINEAR(ak4396_db_scale, > TLV_DB_GAIN_MUTE, 0); > > > > since the datasheet mention that dB range is only -48dB to 0dB > > > > ATT = 20 log10 (ATT_DATA / 255) [dB] > > > > How can AK4396 has scale of -inf DB to 0dB in the driver code ? > > When ATT_DATA = 0, there is no output, which is an attenuation of -inf. > The next value, ATT_DATA = 1, results in ATT = -48 dB. > But snd_mixer_selem_get_playback_dB_range() does not return 48dB ** _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
