FED-STD-1015 1984 Edition, November 28, 1984
ANALOG TO DIGITAL CONVERSION OF VOICE BY 2,400 BIT/SECOND LINEAR PREDICTIVE CODING
This standard specifies interoperability requirements relating to the conversion of analog voice to 2,400 bit/s digitized voice by Linear Predictive Coding with 10 reflection coefficients (LPC-10), and reconversion back to analog voice.
The primary objective of this standard is to facilitate the interoperability of Government communication facilities and systems that employ 2,400 bit/s digitized voice.
This standard applies to all synchronous (i.e. not packetized) 2,400 bit/s digitized voice telecommunications equipment procured or leased by Federal departments and agencies. While additional analog-to-digital conversion techniques and data rates may be used, all Government synchronous 2,400 bit/s digitized voice equipment shall be capable of LPC-10 operation in conformance with this standard.