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'[EE]:speech'
2002\10\23@063301 by mike

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Any thoughts/comments on the cheapest way to produce reasonably
intelligible speech - just numbers 0-9 plus half a dozen short words.
Volumes are hundreds so mask ROM is not an option.

The thoughts I've had so far :
Pic + external (OTP) speech chip Pros : potentially simple
Cons : may need different OTP chips for different languages, depending
on capacity.
Any suggestions  for speech chips? - I know about OKI (MSM66P54 etc.)
Anyone know OKI's pricing, and if they are interested in sub-zillion
quantities ?
TI's TSP50 processor with built in speech looks interesting but is now
obsolete - is there anything similar - OTP/flash CPU with on-chip
speech ?

PIC + EEPROM/Dataflash/EPROM, output via PWM
Cons : Would PWM provide good enough quality?
Pros : easy to load different data for different languages

As above, output via cheap CD player DAC (I've used this in the past
for a higher-quality application with a 16C63, Atmel Dataflash & AKM
DAC)
Cons : cost

PIC + ISD analogue storage chip Cons : cost, less easy to program ISD chips.`
Pros : direct speaker drive, reasonable quality

PIC + ADPCM or LPC + PWM output
Would ADPCM/LPC coding allow this much vocabulary in 8K of PIC
internal memory (F877)?

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2002\10\23@081016 by Alan B. Pearce

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>Any thoughts/comments on the cheapest way to produce reasonably
>intelligible speech - just numbers 0-9 plus half a dozen short words.
>Volumes are hundreds so mask ROM is not an option.


Check out Olin's HAL project. He has a program to convert WAV files to data
tables for a PIC, which then produces sound using the PWM output. This may
produce something of acceptable quality. Certainly worth experimenting for a
couple of days.

http://www.embedinc.com/pic/

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2002\10\23@082054 by Olin Lathrop

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> Check out Olin's HAL project. He has a program to convert WAV files to
data
> tables for a PIC, which then produces sound using the PWM output. This may
> produce something of acceptable quality. Certainly worth experimenting for
a
> couple of days.
>
> http://www.embedinc.com/pic/

Thanks for the plug, Alan.  I just want to point out that the bandwidth for
the HAL project was severly limited, allowing about 7 seconds of sound in a
16F876 in addition to the program.  A 18F252 should give you about twice the
storage, and even simple compression should get you some more time.  I keep
meaning to redo the HAL project using a modified variable slope delta
modulation I've been thinking about, but too many other things keep getting
in the way.


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(978) 742-9014, http://www.embedinc.com

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