PCMFlowG722 wideband (HD voice) codec for ESP32
The PCMFlowG722 is an optional G.722 wideband codec add-on for real-time voice communication over various networks. It offers HD voice quality with a 64 kbps bitrate, utilizing the same packet size as the G.711 codec but providing twice the audio bandwidth. This codec is designed for use with ESP32 and similar microcontrollers, making it suitable for applications requiring efficient voice transmission.
- ▪PCMFlowG722 supports HD voice quality at a bitrate of 64 kbps.
- ▪The codec is compatible with various platforms, including ESP32 and RP2040.
- ▪It compresses audio efficiently, allowing for better voice intelligibility compared to narrowband codecs.
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PCMFlowG722 日本語版: README.ja.md Optional G.722 wideband (HD voice) codec add-on for PCMFlow, aimed at real-time two-way voice over packet radio / network — VoIP, ESP-NOW transceivers, WebSocket / UDP voice links. G.722 carries 7 kHz audio at 16 kHz sampling using the same 64 kbps wire budget as G.711 — same packet size, twice the audio bandwidth. The codec core is the public-domain sippy/libg722 (Steve Underwood / CMU); this library wraps it behind PCMFlow's PCMSource / PCMSink interfaces. PCMFlowG722's own code is MIT. The vendored upstream is Public Domain (Steve Underwood's contributions) + a permissive CMU notice, both MIT-compatible — see src/external/LICENSE_libg722.md. See SPEC.md for the full specification.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at GitHub.