Audio Codec
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An algorithm that compresses and decompresses audio data for transmission and playback.
Common codecs include Dolby Digital (AC-3), DTS, Dolby TrueHD, and DTS-HD Master Audio. Lossy codecs like AC-3 fit through bandwidth-limited connections (ARC, S/PDIF). Lossless codecs require eARC or HDMI direct connection. Bluetooth audio codecs (SBC, AAC, aptX, LDAC) have their own bandwidth and latency tradeoffs.