Mosab,
as far as I am concerned, MicaZ don't have a built in microphone. May be
you are talking about the microphone present in MTS300/310 sensor board.
If it is correct, I think you are not able to do what you are trying to
do. The built in microphone of MTS300/310 is connected to a filter designed to
identify the sound emitted by another MTS300/310, I think the frequency is 4
kHz.
You can use a MDA100 sensor board for prototiping a sound data
collector, or you can use a MDA300. In both of these cases, you will have to
construct the hardware around the microphone, with few resistors and
capacitors, no more than 5 components. Then you may use HighFrequencySampling
demo app to sample your voice. But you will have a hard work in customizing
your program.
Another question you must be in mind is "transmission rate".
Human voice frequency is under 4 kHz. So you can use 8 kHz frequency
sampling (you must do 2 samples per cycle). All the samples will be 10 bits
long, being stored in a 16 bit variable (uint16_t). Then you will have to
transmit about 16x8000 bits per second. 128kbps is almost the transmission
rate limit of MicaZ (250kbps).
Maybe, if you use only 8 bits to represent each sample, you will be able
to transmit voice over MicaZ link. But you will not be able to connect more
than two MicaZ in your network. The best choice is processing the samples
locally in order to shrink the information before sending it through the
network. Then this will be a very good work for your graduation.
*****************
João Giacomin
Prof-DCC-UFLA
*****************
---------- Original Message -----------
From: Michael Schippling <[EMAIL PROTECTED]>
To: "Mosab I. Messad" <[EMAIL PROTECTED]>, TINYOS HELP <tinyos-
[EMAIL PROTECTED]>
Sent: Mon, 27 Oct 2008 13:52:45 -0600
Subject: Re: [Tinyos-help] voice Recording and Transmitting in micaZ&TinyOS
> Oh, I see, there are a few messages about microphones
> but they are not much help since most of them are questions
> rather than answers, and the answers are mostly mine related
> to folks not understanding what a microphone does...
>
> Since I haven't done anything with it I can't provide much advice
> beyond looking at HFS or trying to free-run the ADC at a reasonable
> rate, and then doing a buffering scheme like Oscilloscope. Message
> transmission is quite a bit slower than audio bandwidth, and since
> you only have a small amount of RAM to work with you can't record
> for very long. I'm not sure if you can use the EEPROM "Log" storage
> as it may be too slow. This may be why there are no answers...
>
> sorry
> MS
>
> Mosab I. Messad wrote:
> > Thanks for replaying Mr.Schippling.
> >
> > yea I searched every article that includes
> > sound/recording/voice/microphone or any related feature.
> >
> > and I didnt save any effort, and search place or site that related to
> > what I need but found nothing.
> >
> > just talk no helpful examples :(
> >
> > hope one used and tested this thing help me.
> >
> > thanks again
> >
> > --------------------------------------------------
> > From: "Michael Schippling" <[EMAIL PROTECTED]>
> > Sent: Monday, October 27, 2008 8:55 PM
> > To: "Mosab I. Messad" <[EMAIL PROTECTED]>
> > Cc: <[email protected]>
> > Subject: Re: [Tinyos-help] voice Recording and Transmitting in micaZ&TinyOS
> >
> >> Many have tried, search this list of audio, sound, microphone.
> >> The HighFrequencySampling demo app in T1 is probably the place
> >> to start.
> >>
> >> MS
> >>
> >>
> >> Mosab I. Messad wrote:
> >>> Slaam Alekoam,
> >>> Hello to all, I am working on a project that includes recording
> >>> human voice using the micaZ node using the built in microphone inside
> >>> it and after recording, it is buffered it for 4 seconds or get sent
> >>> direct to main mote, to be collecting in a reasonable time file all
> >>> received samples as one file and perfrom voice processing on that file.
> >>> my question is can any body help me and know a tested and used code
> >>> for the voice recording and transmitting to start the voice recording
> >>> from internal microphone process according to an interrupt signal
> >>> send from a sensor on the sensors board and after recording it will
> >>> be transmitted wirelessly to the main mote connected to the computer.
> >>> or any similar code that is related to sound recoriding using the
> >>> tinyos-1.x with micaZ motes.
> >>> I will be very very thankful if any body could help me at least of
> >>> part of this problem because my graduation depends on that.
> >>> With My Regrads;
> >>> Mosab I. Messad
> >>>
> >>>
> >>> ------------------------------------------------------------------------
> >>>
> >>> _______________________________________________
> >>> Tinyos-help mailing list
> >>> [email protected]
> >>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
> >>
> >> --
> >> Platform: WinXP/Cygwin
> >> TinyOS version: 1.x, Boomerang
> >> Programmer: MIB510
> >> Device(s): Mica2, MicaZ, Tmote
> >> Sensor board: homebrew
> >>
> >>
>
> --
> Platform: WinXP/Cygwin
> TinyOS version: 1.x, Boomerang
> Programmer: MIB510
> Device(s): Mica2, MicaZ, Tmote
> Sensor board: homebrew
>
> _______________________________________________
> Tinyos-help mailing list
> [email protected]
> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
------- End of Original Message -------
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