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Speex: a free codec for free speech
Speex is an Open Source/Free Software patent-free audio compression format designed for speech. The Speex Project aims to lower the barrier of entry for voice applications by providing a free alternative to expensive proprietary speech codecs. Moreover, Speex is well-adapted to Internet applications and provides useful features that are not present in most other codecs.
Speex Audio Codec, Version 1.2
https://www.loc.gov/preservation/digital/formats/fdd/fdd000259.shtml
Speex Audio Codec, Version 1.2: Description: Speech codec designed for packet networks and voice over IP (VoIP) applications but not for mobile phones. File-based compression is also supported. The flexible codec is based on Code Excited Linear Prediction (CELP) and supports a wide range of speech quality and bit-rates.
Projects & Blogs - Speex Audio Codec - Silicon Labs
https://community.silabs.com/s/share/a5U1M000000knjUUAQ/speex-audio-codec?language=en_US
Speex is a free audio codec which provides high level of compression with good sound quality for speech encoding and decoding. Speex is an open source and patent-free audio compression format designed for speech. Speex is based on CELP (Code-Excited Linear Prediction) and is designed to compress voice at bitrates ranging from 2 to 44 kbps.
Speex Voice ACM Codec 1.0.1.1 Free Download
https://www.free-codecs.com/download/speex_voice_acm_codec.htm
Both Mono and Stereo modes are supported. The sampling rates used by the Speex Voice ACM Codec are 8, 16 and 32 kHz (narrowband, wideband, respectively ultawideband). The codec can achieve bitrates between 2.2 kBit/sec and 48.9 kbit/sec. The Speex Voice ACM Codec has an intuitive, user-friendly interface and it can be easily set up.
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