Minor epoch produced sound technology (10)

I believe the answer is:

microphone

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'sound technology' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'minor epoch produced' is the wordplay.
'produced' is an anagram indicator.
'minor'+'epoch'='minorepoch'
'minorepoch' is an anagram of 'MICROPHONE'.

Can you help me to learn more?

(Other definitions for microphone that I've seen before include "Device to pick up and transmit sounds" , "Sound receiver" .)

I've seen this clue in the Sydney Morning Herald.

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