Re: Sound module suggestions?

From: onestone (onestoneXYZ_at_ABCbigpond.net.au)
Date: 06/15/04 

Date: Tue, 15 Jun 2004 17:07:56 GMT

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

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