Thanks João Carlos,
First of all yea am talking about the built in microphone that comes with that
sensor board.
and as I had seen that many project have done very similar things related to
that and am trying
a project named "Microphone/Sounder Simulation" By Asuman Sunbul, and other
voice recording projects, they are almost dealing with but I think
it is not dealing with human voice, and as I have been reading its a must to
perform the sampling and
that is what am intending to do it locally to reduce the huge data and network
load since I will be
using about 4 to 5 micaZ nodes, or to perform little sample to recorded packets
directly, that makes the voice packets readable with good minimum good quality.
since after collecting these packets in the PC I will be doing some voice
processing operation on them.
---
Michael Schippling,
i think many of the voice recording are deal with the Tone Detector option for
recording, and I think it may be helpful too but still the sampling side that
may be little
confusing. but I think your advise should be tried in order to see how
effective it is and I will be trying anything :( hope I get good results.
thanks a lot for what all of you are providing me with till now .
**********************************
With My Regrads;
Mosab I. Messad
**********************************
>Date: Tue, 28 Oct 2008 12:47:05 -0600
>From: Michael Schippling <[EMAIL PROTECTED]>
>Subject: Re: [Tinyos-help] voice Recording and Transmitting in
>micaZ&TinyOS
>To: [EMAIL PROTECTED]
>Cc: [email protected]
>Message-ID: <[EMAIL PROTECTED]>
>Content-Type: text/plain; charset=windows-1252; format=flowed
>
>On the "standard" micasb board, which I believe is the MDA100, one can send
>the pre-amplified microphone signal directly to ADC2 on the mica processor
>board by turning PW6 off (by inspection of the "Mic Output Selector" section
>of the schematic). There are also tone detector options. There is no low-pass
>filtering on the raw signal so some aliasing could be expected. You can get
>an intelligible voice signal (for western languages at least) with a 2KHz
>bandwidth and 8 bits (4K bytes/sec), and you can reliably send about 100
>msg/sec with a single micaz, which comes to 2900 bytes/sec of payload.
>
>So there's your numbers...
>
>Which means that JCG's conclusion that the OP should do some kind of local
>>processing for his thesis is also highly recommended by this author.
>
>MS
>
Jo?o Carlos Giacomin wrote:
> 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.
>
>
> *****************
> Jo?o 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 didn?t 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 -------
>
> _______________________________________________
> 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
>
>
>
>------------------------------
>
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