I hope to get more accurate result. I already understand your quick & dirty method. Since CDD section 5.3 has mentioned the accurate data, I hope to get the exact data on my Nexus S. How can do this?
On Apr 14, 11:00 pm, Glenn Kasten <[email protected]> wrote: > For the quick & dirty method I mentioned on 3/15, feedback the audio > output into the audio input, record the signal to a file using a > separate computer, and generate an impulse. Open up the recording file > with an audio analysis app such as Audacity or similar. The time > between successive peaks is a rough approximation of the sum of input > and output latencies. Note that this method does not isolate the > individual input & output components, nor does it distinguish the > various kinds. For that you need to use one of the more accurate > methods mentioned. > > On Apr 13, 10:50 pm, Jackie <[email protected]> wrote: > > > > > On Mar 15, 11:05 pm, Glenn Kasten <[email protected]> wrote:> For more > > accurate measurements of audio output latency, one method is > > > to send an impulse through audio out at same time as a known low > > > latency path (for example a level change on a GPIO parallel output > > > pin), and compare the times to see the audio impulse out and the level > > > see the audio impulse out ? How can I do this with high accuracy. You > > know, I can not depend on my ear. And I just have a Nexus S, and no > > hardware access. > > Is it possible to get following data with high accuracy by API/ > > software? > > 1. cold output latency > > 2. warm output latency > > 3. continuous output latency > > 4. cold input latency > > 5. continuous input latency > > > > change. A similar method, in reverse, could be used for audio input. > > > > On Mar 14, 12:20 pm, "David O." <[email protected]> wrote: > > > > > Is there a standardized/preferred method for validating thesection > > > >5.3Audio Latency requirements? It's not clear to me if CTS covers > > > > audio latency testing. > > > > > Thanks, > > > > David- Hide quoted text - > > > > - Show quoted text -- Hide quoted text - > > - Show quoted text - -- unsubscribe: [email protected] website: http://groups.google.com/group/android-porting
