On Fri, 03 Jun 2016 04:05:08 +0200, vivian.zhang@xxxxxxxxx wrote: > > From: "vivian,zhang" <vivian.zhang@xxxxxxxxx> > > Audio latency is the time delay as an audio signal passes through > a system. There are many kinds of audio latency metrics. One useful > metric is the round trip latency, which is the sum of output latency > and input latency. > > The measurement step works like below: > 1. Listen and measure the average loudness of the environment for > one second; > 2. Create a threshold value 16 decibels higher than the average > loudness; > 3. Begin playing a ~1000 Hz sine wave and start counting the samples > elapsed; > 4. Stop counting and playing if the input's loudness is higher than > the threshold, as the output wave is probably coming back; > 5. Calculate the audio latency value in milliseconds. > > Signed-off-by: Zhang Vivian <vivian.zhang@xxxxxxxxx> Applied now. Thanks. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
