Hi, Get UTC from GPS Location or NMEA.
Regards On Oct 1, 9:11 am, RLScott <[email protected]> wrote: > I also have a need for accurate NTP embedded into my app. I am > writing a very accurate musical instrument tuner. One of the things > that such an app needs to do is to calibrate the device to compensate > for variations in the sound system's quartz crystal time base. On > another platform I did this by having the user call up the NIST's free > time and frequency standard service on a wired phone and let my app > listen to the 500 Hz or 600 Hz reference tones. But that is a pain > for the user. I would like to offer a alternative NTP method of doing > this for devices that have occasional broadband internet connection.. > My idea is to sample NTP time at the same time that I start counting > audio packets coming in from the sound API. Then after some time > (maybe 10 minutes) sample NTP again. By knowing the difference in NTP > time and the number of audio packets processed I can find the > necessary calibration for that device. The accuracy I am looking for > is 1 part in 200,000. For a 10-minute sample interval that translates > to a total time accuracy of 3 msec. If that is difficult to do with > NTP then I could extend my sample time to 100 minutes. Then I would > only need 30 msec. time accuracy. But the longer I make the sample > period the more of a pain it becomes for the user, even if he only has > to do this once when the app is first installed. Can anyone tell me > if embedding NTP into my app is likely to serve this purpose? > > On Sep 30, 2:48 pm, Jim Graham <[email protected]> wrote: > > > > > > > > > On Wed, Sep 28, 2011 at 11:52:18AM -0700, cool_zack wrote: > > > > I want to get UTC time. It should not change except for tiny > > > adjustments that happen from Network. User modifications to the time > > > on the device must not affect it. > > > What you're asking for is SNTP (often abbreviated as NTP). If all you > > need is an app, search in the market for NTP. Most of the NTP apps > > will set your device's clock (requires root). > > > There's an app, called "UTC Time" which displays local time and UTC > > side by side. With a rooted device, it will also keep your device's > > time set to whichever SNTP server you have it configured for. > > > If you need this for an app you're writing, let me know what you find, > > as I have some ideas along that line, myself...... > > > Later, > > --jim > > > -- > > THE SCORE: ME: 2 CANCER: 0 > > 73 DE N5IAL (/4) | Remember your spelling rules, including: > > [email protected] | I before E except after C > > < Running FreeBSD 7.0 > | > > ICBM / Hurricane: | BEING a native-born American, I don't > > 30.44406N 86.59909W | always notice our WEIRD spelling.... > > > Android Apps Listing athttp://www.jstrack.org/barcodes.html -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
