Audio Frequency Modulation

Audio Frequency Modulation (AFM) is an audio recording standard used by Betamax and VHS Hi-Fi stereo, 8mm and Hi8 video systems. AFM is mono on 8mm systems and stereo on Hi8.

References

{{cite book|title= VCR Troubleshooting & Repair|last= Capelo|first= Gregory R.|last2= Brenner|first2= Robert C.|year= 1998|publisher= Newnes|isbn= 978-0-7506-9940-2|chapter= VCR Audio Processing: Theory and Troubleshooting|url-access= registration|url= https://archive.org/details/vcrtroubleshooti00cape}}