Recording a speech in different formats simultaneouly

[[email protected]]

I wanted to find out if there's a device out there that
can be used by a speaker to record a speech to a standard
audio cassette and digitally (for example, mp3 format)
simultaneously. I need the device to be portable.

Does something like this exist? Any pointers would be
appreciated.

Currently the speech is recorded only on a standard audio
cassette and converting it to digital format requires
an additional investment of time. I'm looking for a way
to get around that.

Thanks,
Anoop