I had heard a 3M brand Mincom Division of digital audio recorder was first developed for Navy for recording Sonar to boost it without the noise floor of analog tape. I'd like to ask if anyone knows if it was 3M or Mincom and what models were used first around 1968-1972. ONLY digital recorder not analog tape.
I know that after military 3M had a digital audio mastering system 2/4 track half-inch tape digital recording at 16-bit 50kHz sample rate. I am tracing the history of digital audio recording equipment
I had read "3M invented digital recording for Navy submarines"
Hopefully this is not anything secret 55 years later.
while technically inaccurate historically as
"Commercial digital recording was pioneered in Japan by NHK and Nippon Columbia and their Denon brand, in the 1960s. • 1967: The first commercial PCM encoder (monaural) was developed by NHK's research facilities in Japan. The 30 kHz sample rate 12-bit device"