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Vocoder Phone Voice
Linear Predictive Coding
- this page is a stub
Linear Predictive Coding (LPC), also known as LPC-10, FIPS 137 or
FED-STD-1015, is a speech encoding standard,
or vocoder, used in secure telephony.
It is basically a method for digitizing speech by analyzing and storing
specific characteristics of it,
such as pitch and voiced/voiceless sounds,
in such a way that an intelligible
signal can be reconstructed later.
The standard, finished on 28 November 1984, was developed by the
US Department of Defense (DoD) and is based on the
earlier STANAG 4198 standard, promulgated by
NATO on 13 February 1984 [1].
LPC was used with early voice encryption equipment, such as
STU-I, STU-II,
VINSON KY-57 and
Philips Spendex 40,
and allows speech compression at low bitrates — typically between 800 and
2400 baud.
LPC-10E was a US Government standard that was even used on
STU-III terminals when running at
2400 baud. As it is an open standard, it was used by many manufacturers.
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- Linear Predictive Coding
- LPC
- LPC-10
- FIPS 137
- FED-STD-1015
- STANAG 4198
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© Crypto Museum. Created: Saturday 03 April 2021. Last changed: Wednesday, 27 July 2022 - 08:14 CET.
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