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Speex: a free codec for free speech
Overview. Speex is an Open Source/Free Softwarepatent-free audio compression format designed for speech. The Speex Project aims to lower the barrier of entry for voice applicationsby providing a free alternative to expensive proprietary speech codecs. Moreover, Speex is well-adapted to Internet applications and providesuseful features that are not present in most other codecs.
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.
GitHub - chenyayun/Speex: speex audio encoder and …
https://github.com/chenyayun/Speex
speex audio encoder and decoder. Contribute to chenyayun/Speex development by creating an account on GitHub.
G.711, G726A and Speex Encoders | Microchip Technology
https://www.microchip.com/en-us/solutions/consumer/audio-and-speech/audio-solutions/g711-g726a-and-speex-encoders
32-bit PIC Microcontrollers (MCUs) 32-bit SAM Microcontrollers (MCUs) CEC 32-bit MCUs. Legacy 32-bit Microcontrollers (MCUs) Applications, Reference Designs and Solutions. 32-bit Embedded Security. Functional Safety with SAM and PIC32 MCUs. Rapid Prototyping with 32-bit MCUs. Softpacks.
Vocoder demonstration using a Speex audio codec …
https://www.st.com/resource/en/application_note/cd00204907-vocoder-demonstration-using-a-speex-audio-codec-on-stm32f101xx-and-stm32f103xx-microcontrollers-stmicroelectronics.pdf
AN2812 Speex codec overview 5/21 1 Speex codec overview The Speex codec is an open-source, patent- and royalty-free software dedicated to speech compression and decompression. Speex is based on CELP (code-excited linear prediction) and designed to compress voice at bitrates ranging from 2 to 44 kbps. The features of Speex include:
Sample code - speex.org
https://speex.org/docs/manual/speex-manual/node13.html
This section shows sample code for encoding and decoding speech using the Speex API. The commands can be used to encode and decode a file by calling: % sampleenc in_file.sw | sampledec out_file.sw where both files are raw (no header) files encoded at 16 bits per sample (in the machine natural endianness). sampleenc.c
iphone - iOS Audio Unit + Speex encoding is distorted ...
https://stackoverflow.com/questions/11499957/ios-audio-unit-speex-encoding-is-distorted
Here are the encode and decode functions (Input to encode is 320 bytes of signed integers from the audio unit render function, Input to decode is 62 bytes of compressed data ): #define AUDIO_QUALITY 10 #define FRAME_SIZE 160 #define COMP_FRAME_SIZE 62 char *encodeSpeexWithBuffer (spx_int16_t *buffer, int *insize) { SpeexBits bits; void *enc_state; …
Command-line encoder/decoder - speex.org
https://speex.org/docs/manual/speex-manual/node6.html
The speexenc utility is used to create Speex files from raw PCM or wave files. It can be used by calling: speexenc [options] input_file output_file The value '-' for input_file or output_file corresponds respectively to stdin and stdout. The valid options are: -narrowband (-n) Tell Speex to treat the input as narrowband (8 kHz). This is the default
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