Re: [android-developers] Re: how to convert morse sound to text???

This question shouldn't be on this list. This is a signal processing
question, and not a "really simple" one.. You'll need a signal and
audio processing library, which you can probably find somewhere. The
Android part of this question is how you get the audio, but actually
processing it and detecting the morse code is nontrivial.. I know I've
seen algorithms for doing this sort of thing in textbooks before, but
I'd guess that if you don't have a signals background it's going to
take quite a bit of work. Perhaps try an amateur EE forum?

kris

On Sun, Jan 15, 2012 at 8:41 PM, Ludy Lu <ludy520@gmail.com> wrote:
> That app should not remove noise,now i want to konw how to compute a dit
> duration from the buffer of audiorecord???
>
>
> 2012/1/13 RLScott <fixthatpiano@yahoo.com>
>>
>> Have you tested the app to see how much noise it can tolerate? And
>> have you listened to how much noise there is in actual use on the
>> shortwave radio bands?
>>
>> On Jan 13, 12:22 am, Ludy Lu <ludy...@gmail.com> wrote:
>> > android market has a application named morse code reader can convert
>> > morse
>> > sound to text...
>> >
>> > 2012/1/13 RLScott <fixthatpi...@yahoo.com>
>> >
>> >
>> >
>> > > The job of parsing Morse code can be very simple if the sound is clean
>> > > and regular.  If it is a little bit irregular in timing, then the job
>> > > gets harder.  If there is a little noise, then it gets harder still.
>> > > And if there is a lot of noise, then the programming becomes nearly
>> > > impossible.  The last I heard, a program could not beat a trained
>> > > human listener in the toughest of environments.  So how clean and
>> > > regular in timing is this Morse code that you want to parse.
>> >
>> > > On Jan 12, 10:48 pm, Ludy Lu <ludy...@gmail.com> wrote:
>> > > > now question is how to remove noise and how to compute a dit length
>> > > > from
>> > > > pcm buffer???
>> >
>> > > > 2012/1/13 Indicator Veritatis <mej1...@yahoo.com>
>> >
>> > > > > It would if there were an Android API for it. I am not aware of
>> > > > > one,
>> > > > > and I doubt one exists. This is rather a fairly simple (audio)
>> > > > > signal
>> > > > > processing task.
>> >
>> > > > > What does have to do with Android is the question: how can he use
>> > > > > the
>> > > > > phone's microphone to listen to the sound, what APIs should he use
>> > > > > to
>> > > > > generate an audio stream out of it (for that signal processing)?
>> > > > > The
>> > > > > answer to these questions is not obvious either.
>> >
>> > > > > On Jan 12, 10:47 am, TreKing <treking...@gmail.com> wrote:
>> > > > > > On Thu, Jan 12, 2012 at 2:13 AM, ludy <ludy...@gmail.com> wrote:
>> > > > > > > i use audiorecord to record morse sound ,and then need to
>> > > > > > > convert
>> > > morse
>> > > > > > > sound to text,how to do that???
>> >
>> > > > > > Write the code to do that or use a library. This has nothing to
>> > > > > > do
>> > > with
>> > > > > > Android specifically.
>> >
>> > >
>> > > ---------------------------------------------------------------------------
>> > > ----------------------
>> > > > > > TreKing <http://sites.google.com/site/rezmobileapps/treking> -
>> > > Chicago
>> > > > > > transit tracking app for Android-powered devices
>> >
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