NASA NTRS · 19770000029
Combined PAM/PCM audio switching system
Abstract
System is well suited to PBX telephone exchange. Economic electronic changing offers extensive conference capability in telephone communication. System may be used for party to party calls as well.
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Abbey, D. L.. 1977-06-01. Combined PAM/PCM audio switching system. https://ntrs.nasa.gov/citations/19770000029
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