![]() In fact, the actual rating is an average of those nine local ratings. As each device is tested with nine different sound samples, there are nine different local ratings for a device. In most cases using this device/technology:ġ.0 – you will hear heavily distorted soundĢ.0 – you will hear unpleasant sound artifactsģ.0 – you will hear distinctly audible but tolerable sound artifactsĤ.0 – you will hear faintly discernible sound artifactsĥ.0 – you will not hear any sound artifactsĪbove 5.0 – all sound artifacts will be beyond threshold of human perception with corresponding perception marginĪnd - "low" and "high" of rating. Anchor points could be interpreted as follows: Value of actual perceived audio quality (rating) which is also indicatedīy the bar length. The rating bar consists of the following elements: Audio format: 320kbps, 44 kHz, stereo CBR Wma 9.1 - Windows Media Audio 9.1 (Standard) CBR, 322.8 kbit/s FBR Vorbis (Xiph 1.3.1) - Ogg Vorbis, 313.4 kbit/s FBR 44100 Hz, Dual Channel - bitpool: 47, bands: 8, blk_len: 16, allocation method: Loudness usage: sbc_encoder -v -p -r552000 -oout.sbc ref.wav SBC XQ (Bluetooth) - Subband codec for Bluetooth A2DP profile, CBR, 551.2 kbit/s FBR 44100 Hz, Dual Channel - bitpool: 38, bands: 8, blk_len: 16, allocation method: Loudness usage: sbc_encoder -v -p -r453000 -oout.sbc ref.wav SBC XQ (Bluetooth) - Subband codec for Bluetooth A2DP profile, CBR, 452.0 kbit/s FBR bitpool:61, bands:8, allocationn method: SNR usage: sbc_encoder -jv -oout.sbc ref.wav bitrate) - Subband codec for Bluetooth A2DP profile, CBR, 372.1 kbit/s FBR bitpool:53, bands:8, allocationn method: SNRĭECODER: SBC Decoder LIB Version 1.5 (Philips) High Quality setting recommended by Bluetooth SIG usage: sbc_encoder -jv -r328000 -oout.sbc ref.wav SBC (High Quality) - Subband codec for Bluetooth A2DP profile, CBR, 328.0 kbit/s FBRĬODER: SBC Encoder LIB Version 1.5 (Philips) usage: opusenc -bitrate 256 ref48.wav out.opusĭECODER: foobar2000 v1.3.7 (32bit output) Opus (libopus 1.1) - free audio format (IETF RFC6716), VBR, 290.1 kbit/s FBR usage: lame -preset insane ref.wav out.mp3 usage: ffmpeg -sample_rate 44100 -i out.aptxhd out.wavĪTRAC SP (MD) - ATRAC1 SP (Type-R) 292 kbit/s (Minidisk)ĪTRAC3plus - ATRAC3plus 352 kbps (353.0 kbit/s FBR) usage: ffmpeg -i ref.wav -acodec aptx_hd out.aptxhd usage: ffmpeg -sample_rate 44100 -i out.aptx out.wavĪptX HD (Bluetooth) - Codec for Bluetooth A2DP profile, CBR, 529.2 kbit/s FBRĬODER: ffmpeg 4.0.2 (Lavc58.18.100 aptx_hd) usage: ffmpeg -i ref.wav -acodec aptx out.aptxĭECODER: ffmpeg 4.0.2 (Lavc58.18.100 pcm_s16le) Convert to format: PCM 44100Hz 16bit StereoĪptX (Bluetooth) - Codec for Bluetooth A2DP profile, CBR, 352.8 kbit/s FBR ![]() AAC (Winamp 5.2) - MPEG-2 AAC Low Complexity CBR, 320.4 kbit/s FBRĬODER: LC-AAC Encoder v1.2 from Winamp 5.2 build 449 BetaĪAC+ (Winamp 5.2) - MPEG-2 AAC High Efficiency CBR, 320.2 kbit/s FBRĬODER: aacPlus (HE-AAC) High Bitrate Encoder v1.2 from Winamp 5.2 build 449 Beta ![]()
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