Final answer:
Backend speech recognition is used when the physician edits the document after it has been transcribed by front-end speech recognition.
Step-by-step explanation:
When the physician edits a document using speech recognition, it is known as backend speech recognition. This type of speech recognition occurs after the audio has been recorded and transcribed into text by the front-end speech recognition system. The physician then reviews and edits the transcribed document to ensure accuracy and make any necessary modifications.