[Tinyos-help] how to change speaker volume of Tmote Invent

[yicheng]

How to reduce the amplitude? By decreasing the value of wave data? They are
totally 8k bytes data, so each time I change the volume, I have to change
all of those one by one, it's awkward and time consuming. Can I offset the
DAC output with variable calibration voltage or using variable reference
voltage?

Thanks!
Yicheng

-----Original Message-----
From: joe.polastre at gmail.com [mailto:joe.polastre at gmail.com] On Behalf Of
Joe Polastre
Sent: Wednesday, May 02, 2007 4:44 PM
To: yicheng
Cc: tinyos-help at millennium.berkeley.edu
Subject: Re: [Tinyos-help] how to change speaker volume of Tmote Invent

Reduce the amplitude of the signal.  Remember that sound volume is
logarithmic.

-Joe

On 5/2/07, yicheng <y-jie at northwestern.edu> wrote:
>
>
>
>
> Hi Folks,
>
>
>
> I have a piece of wave data stored in Tmote (about 8k bytes), I need to
> dynamically change its volume (by software) when it's being played through
> the speaker. Can someone tell me how to do it?
>
>
>
> Thanks!
>
> Yicheng
>
>
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>