Speech Delay Device?, solve interpreters problem Options

[webchannel5.com]

looking for a device for interpreters that takes incoming speech into memory... pitch controls it and has a variable speed output. This would solve a problem when the person speaking into a microphone speeds up (in conversation) making the interpreter stumble with translation due to increased words per minute.
Would be simple enough but need to know if it exists. Can anyone help me with info?
thanks.