Roland:

         I'm not sure I fully understand all of your questions, but I am
using the ISD5116 in a current project and my experience with it might be
helpful.  I am currently using it in a project that does a continuous
record loop and then plays back the last X seconds when a button is
pressed.  I feed raw audio into the device and have it pass it thru as well
as record it to the internal memory.  The audio path inside the chip is
highly configurable using the configuration registers and the audio amp is
powerful enough that I can drive a speaker directly from the chip.  I love
the fact that I can control the sampling rate and utilize a digital volume
control within the chip itself.  I'm not using the digital data storage
feature of the chip, but I believe your understanding of it is correct....
you decide how much memory you want to allocate to this function and it
then reduces the amount of memory available for sound recording.  I think
this chip was originally designed for telephone applications and the
digital storage area was designed to store "phonebook" type data.

John Hansen


At 10:58 AM 6/3/2004 +0200, you wrote:
>Hi all
>
>A question to anyone who is familiar with the ISD devices, especially the
>ISD5216.
>
>I am wanting to use the device, but need to clarify something first. Please
>read my understanding and comment if it is right or not. This pertains
>specifically to recording a signal into the chip.
>
>Unless I'm really missing something, you cannot digitally program the
>multilevel array using the I2C bus. You can choose an area of the array and
>config it to digital, but then it's use is digital only, like simple ram,
>digital read and digital write.
>
>To program the multilevel array, there has to be some form of analog input,
>but you can use the PCM input as a digital input. If you do this, however,
>you still have to convert your original audio to PCM, so may as well just
>use the Analog in.
>
>The PCM is only useful if your signal train is already in PCM, like from
>the front end of a cell phone.(?)
>And; The CODEC part is only a filter to allow both parties voices on a
>telephone to be mixed.
>
>(this will be a pic system, so the mail qualifies!-)
>
>Regards
>Roland
>
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