Cheap single-chip stereo sample playback device?

[Daniel Rubin]

Hello,

I was wondering if anyone out there knows of some sort of single-chip
stereo sample playback device. Ideally it would read from (external?)
EEPROM or flash memory, decode the sample and play through an embedded
signal processor through a simple trigger pin etc. I am looking for
small inexpensive chips not full fledged MP3 decoders. Sorta like
what is in cards talking picture frames, but in stereo and with higher
quality sound.

Does anyone know of anything like this out there? I have been
googling for it, but have come up with nothing.

Thanks in advance.
- Dan

 

[Tim Mitchell]

In article <a0406583.0403191441.2203dfc6@posting.google.com>, Daniel
Rubin <dan@designdevices.com> writes

Hello,

I was wondering if anyone out there knows of some sort of single-chip
stereo sample playback device. Ideally it would read from (external?)
EEPROM or flash memory, decode the sample and play through an embedded
signal processor through a simple trigger pin etc. I am looking for
small inexpensive chips not full fledged MP3 decoders. Sorta like
what is in cards talking picture frames, but in stereo and with higher
quality sound.

Does anyone know of anything like this out there? I have been
googling for it, but have come up with nothing.

You can do this with a small micro and a DAC. I've made a board using an

AT89C51 which will play back a wav file from EPROM at 22050Hz sample
rate. You could no doubt do it with a pic as well. That's 2 chips (3 if
you include an opamp to buffer & low pass filter the output). I don't
know of a single chip solution.
--
Tim Mitchell

 

[Mike Harrison]

On Mon, 22 Mar 2004 13:37:49 +0000, Tim Mitchell <timng@sabretechnology.co.uk> wrote:

In article <a0406583.0403191441.2203dfc6@posting.google.com>, Daniel
Rubin <dan@designdevices.com> writes
Hello,

I was wondering if anyone out there knows of some sort of single-chip
stereo sample playback device. Ideally it would read from (external?)
EEPROM or flash memory, decode the sample and play through an embedded
signal processor through a simple trigger pin etc. I am looking for
small inexpensive chips not full fledged MP3 decoders. Sorta like
what is in cards talking picture frames, but in stereo and with higher
quality sound.

Does anyone know of anything like this out there? I have been
googling for it, but have come up with nothing.

You can do this with a small micro and a DAC. I've made a board using an
AT89C51 which will play back a wav file from EPROM at 22050Hz sample
rate. You could no doubt do it with a pic as well. That's 2 chips (3 if
you include an opamp to buffer & low pass filter the output). I don't
know of a single chip solution.

You can drive CD-player type DACs from a SPI port and the PWM (to generate LRCLK) on a reasonably
fast PIC. Data can come from something like an Atmel dataflash chip. The code is quite fun, but
certaonly do-able. Pic18 series may be a better choice due to higher clocks and more funciton
instruction set.

 

[Luhan Monat]

Tim Mitchell wrote:

In article <a0406583.0403191441.2203dfc6@posting.google.com>, Daniel
Rubin <dan@designdevices.com> writes

Hello,

I was wondering if anyone out there knows of some sort of single-chip
stereo sample playback device. Ideally it would read from (external?)
EEPROM or flash memory, decode the sample and play through an embedded
signal processor through a simple trigger pin etc. I am looking for
small inexpensive chips not full fledged MP3 decoders. Sorta like
what is in cards talking picture frames, but in stereo and with higher
quality sound.

Does anyone know of anything like this out there? I have been
googling for it, but have come up with nothing.

You can do this with a small micro and a DAC. I've made a board using an
AT89C51 which will play back a wav file from EPROM at 22050Hz sample
rate. You could no doubt do it with a pic as well. That's 2 chips (3 if
you include an opamp to buffer & low pass filter the output). I don't
know of a single chip solution.

Hi,

Check out Windbond Electronics. They make a whole line of analog-flash
storage devices. You could use two of them, or finagle stereo by
storing and retrieving interleaved signals.

--
Luhan Monat: Luhan Knows at Yahoo dot Com
http://members.cox.net/berniekm
"The Future is not what it used to be."