Here is a counter example where AMBE really shines compared to Codec 2. The LPC-10 samples were generated using the Spandsp library. The AMBE samples were generated using a DV-Dongle, a USB device containing the DVSI AMBE2000 chip. I would welcome any samples processed with a modern version of MELP. Notes: The MELP samples are from an early 1998 simulation. Here is Codec 2 operating at 2550 bit/s compared to some other codecs: Codec As you can hear, it’s possible to get about the same quality at 1400 bit/s as 2550 bit/s. Here are some samples from the 21 bit/s versions. The target application for 1400 bit/s is digital voice over HF radio. Work is in progress on a 1400 bit/s version in the codec-dev SVN branch. V0.1A is the current SVN trunk version, a fully function 2550 bit/s codec (51 bits/frame at a 20ms frame rate). You can help and support Codec2 development via a Donation. The motivations behind the project are summarised in this blog post.
#Open source ambe codec license#
It fills a gap in open source, free-as-in-speech voice codecs beneath 5000 bit/s and is released under the GNU Lesser General Public License (LGPL).
Codec 2 operating at 2000 bit/s can send 32 phone calls using the bandwidth required for one 64 kbit/s uncompressed phone call. Applications include low bandwidth HF/VHF digital radio and VOIP trunking. Codec2 is an open source low bit rate speech codec designed for communications quality speech at 2400 bit/s and below.
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