Sinusoidal coding is based on regularities (periodicity) in the pattern of overtone frequencies and layers harmonic sinusoids. Each of these audio segments is declared voiced (vowel) or unvoiced (consonant).Ĭodec 2 uses sinusoidal coding to model speech, which is closely related to that of multi-band excitation codecs. Internally, parametric audio coding algorithms operate on 10 ms PCM frames using a model of the human voice. The codec has been presented in various conferences and has received the 2012 ARRL Technical Innovation Award, and the Linux Australia Conference's Best Presentation Award.
#Amatuer archiver software
The software is developed on Linux and a port for Microsoft Windows created with Cygwin is offered in addition to an Apple Macintosh version. The reference software package also includes a frequency-division multiplex digital voice software modem and a graphical user interface based on WxWidgets.
#Amatuer archiver code
It is programmed in C and current source code requires floating-point arithmetic, although the algorithm itself does not require this.
#Amatuer archiver license
The source code is released under the terms of version 2.1 of the GNU Lesser General Public License (LGPL). The reference implementation is open source and is freely available in a GitHub repository. When sent packed digital bytes, it outputs PCM sampled audio. The speech codec uses 16-bit PCM sampled audio, and outputs packed digital bytes. For example, it uses half the bandwidth of Advanced Multi-Band Excitation to encode speech with similar quality. It outperforms most other low-bitrate speech codecs. Please note that under Section 512(f) any person who knowingly materially misrepresents that material or activity is infringing may be subject to liability for damages.The codec was developed by David Grant Rowe, with support and cooperation of other researchers (e.g., Jean-Marc Valin from Opus). A statement that the information in the notification is accurate, and under penalty of perjury, that the complaining party is authorized to act on behalf of the owner of an exclusive right that is allegedly infringed.A statement that the complaining party has a good faith belief that use of the material in the manner complained of is not authorized by the copyright owner, its agent, or the law.Information reasonably sufficient to permit us to contact the complaining party, such as an address, telephone number, and, if available, an electronic mail address at which the complaining party may be contacted.Providing URLs of our pages where the links appear, URLs where the links point to and Titles/Descriptions of copyrighted pictures/videos in the body of an email is the best way to help us locate content quickly. Identification of the material that is claimed to be infringing or to be the subject of infringing activity and that is to be removed or access to which is to be disabled, and information reasonably sufficient to permit us to locate the material.Identification of the copyrighted work claimed to have been infringed, or, if multiple copyrighted works at a single online site are covered by a single notification, a representative list of such works at that site.A physical or electronic signature of a person authorized to act on behalf of the owner of an exclusive right that is allegedly infringed.To file a copyright infringement notification with us, please send us an email to that includes substantially the following (please consult your legal counsel or see Section 512(c)(3) of the Digital Millennium Copyright Act to confirm these requirements):
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