Re: Sound module suggestions?

From: David Harper (achilles03_at_hotmail.com)
Date: 06/16/04 

Date: 15 Jun 2004 20:50:57 -0700

onestone <onestoneXYZ@ABCbigpond.net.au> wrote in message news:<M1Gzc.29140$sj4.24566@news-server.bigpond.net.au>...
> David Harper wrote:
>
> > I'm looking for an audio module that can store atleast 10
> > addresses/messages (1 sec duration approx). I like quadravox's QV306,
> > but was wondering if there's any other options out there that might be
> > a little less expensive. Anyone have any experience or suggestions?
>
> Try www.winbond.com. They bought out ISD a while back. ISD make solid
> state voice recorders. Some of these are switch driven, some require a
> microcontroller to manage them.
>
> If you only require playback the cheapest and simplest method would
> probably be a small IIC or SPI flash memory, couple with a very cheap
> micro, or some discrete logic to set start/end addresses.
>
> Alternatively if you have any knowledge of microcontrollers you could
> use a flash based part with large enough memory, and flash self
> programming capability to implement this. An MSP430, for instance, using
> straight forward 12 bit analog record and 12->8 bit log compression at
> 6800 samples/second (adequate for voice) would give very high quality
> speech for around 8 seconds. While using something like the modified
> CVSD algorithm posted on the Msp430 yahoo group ftp site with a sample
> rate of 16kHz you would get very passable speech at just 2k/second, so
> around 28 seconds in the MSP430F149.
>
> 1 second messages are not very long. Some years ago when I was
> developing my own speech compression algorithms I studied average word
> lengths, taking 20 different speakers, each reading 5 1000 word
> passages. Without silence, which can be software inserted, I calculated
> that the average spoken word required 0.4 seconds of storage.
>
> Cheers
>
> Al

Wow, thanks for the info! I'll definately check them out. Yeah, I'm
versed in microcontrollers (atleast Basic Stamps), so interfacing it
shouldn't be too hard.

Thanks again!
Dave

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