FED-STD-1015 was re-designated as Federal Information Processing Standard (FIPS) Publication 137, (FIPS PUB 137) on October 20, 1988.[3]
It is also known as "LPC-10".
The codec uses a bit rate of 2.4 kbit/s, requiring 20 MIPS of processing power, 2 kilobytes of RAM and features a frame size of 22.5 ms. Additionally, the codec requires a large lookahead of 90 ms.
Recently an improved version[according to whom?] of the standard was introduced. With a longer super frame structure and better VQ quantizer, the bit rate is reduced to 800 bit/s.[4][unreliable source?]
Referencesedit
^"FIPS PUB 137, Analog to Digital Conversion of Voice by 2,400 Bit/Second Linear Predictive Coding" (PDF). National Institute of Standards and Technology. Retrieved 2018-08-17.
^"PARAMETERS AND CODING CHARACTERISTICS THAT MUST BE COMMON TO ASSURE INTEROPERABILITY OF 2400 BPS LINEAR PREDICTIVE ENCODED DIGITAL SPEECH". North Atlantic Treaty Organization. Retrieved 2018-08-17.
^Xianglin, Wang; C.-C. Jay Kuo (May 1998). "An 800 bit/s VQ-based LPC voice coder". The Journal of the Acoustical Society of America. 103 (5): 2778. Bibcode:1998ASAJ..103.2778W. doi:10.1121/1.422247. S2CID 14294667. Archived from the original on 2013-02-23. Retrieved 2007-03-24.
fips, originally, issued, 1015, secure, telephony, speech, encoding, standard, linear, predictive, coding, vocoder, developed, united, states, department, defense, finished, november, 1984, based, earlier, stanag, 4198, promulgated, nato, february, 1984, 1015,. FIPS 137 originally issued as FED STD 1015 is a secure telephony speech encoding standard for Linear Predictive Coding vocoder developed by the United States Department of Defense and finished on November 28 1984 1 It was based on the earlier STANAG 4198 2 promulgated by NATO on February 13 1984 FED STD 1015 was re designated as Federal Information Processing Standard FIPS Publication 137 FIPS PUB 137 on October 20 1988 3 It is also known as LPC 10 The codec uses a bit rate of 2 4 kbit s requiring 20 MIPS of processing power 2 kilobytes of RAM and features a frame size of 22 5 ms Additionally the codec requires a large lookahead of 90 ms Recently an improved version according to whom of the standard was introduced With a longer super frame structure and better VQ quantizer the bit rate is reduced to 800 bit s 4 unreliable source References edit FIPS PUB 137 Analog to Digital Conversion of Voice by 2 400 Bit Second Linear Predictive Coding PDF National Institute of Standards and Technology Retrieved 2018 08 17 PARAMETERS AND CODING CHARACTERISTICS THAT MUST BE COMMON TO ASSURE INTEROPERABILITY OF 2400 BPS LINEAR PREDICTIVE ENCODED DIGITAL SPEECH North Atlantic Treaty Organization Retrieved 2018 08 17 53 FR 41221 Xianglin Wang C C Jay Kuo May 1998 An 800 bit s VQ based LPC voice coder The Journal of the Acoustical Society of America 103 5 2778 Bibcode 1998ASAJ 103 2778W doi 10 1121 1 422247 S2CID 14294667 Archived from the original on 2013 02 23 Retrieved 2007 03 24 External links editCELP 3 2a and LPC 10 Archived 2016 12 12 at the Wayback Machine Various Speech Coding Links Archived 2016 12 04 at the Wayback Machine LPC10 presentation Soo Hyun Bae ECE 8873 Data Compression amp Modeling Georgia Institute of Technology 2004 nbsp This article related to telecommunications is a stub You can help Wikipedia by expanding it vte nbsp This United States government related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title FIPS 137 amp oldid 1192663362, wikipedia, wiki, book, books, library,
