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which transmitted its signal using -bit pcm, encoded by an opto-mechanical analog-to-digital converter . [ ] the machine did not go into production. [ ] british engineer alec reeves , unaware of previous work, conceived the use of pcm for voice communication in while working for international telephone...
which transmitted its signal using -bit pcm, encoded by an opto-mechanical analog-to-digital converter . [ ] the machine did not go into production. [ ] british engineer alec reeves , unaware of previous work, conceived the use of pcm for voice communication in while working for international telephone...
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vacuum tubes continue to be used in some applications. de forest's prototype audio amplifier of . the audion (triode) vacuum tube had a voltage gain of about , providing a total gain of approximately for this three-stage amplifier. the development of audio communication technology in form of the telephone...