Ratings of such devices are calculated analytically taking into account both the grades received and the amplification applied. Ruler for convenient estimation of "highs" and "lows".įor devices with small impairments (not audible in ordinary listening tests) SoundExpert amplifies their sound artifacts to some predefined extent. ![]() Accuracy depends on number of grades returned by participants. It is also indicated by the color of bar - more accurate ratings have darker bars and less percentage values. ![]() The lowest local rating is more important in this sense as it indicates worst case behavior of tested device. It varies with type of sound material: music of different genres and complexity, voice with or without music, noisy/clear recordings etc. Big gap between them means that sound quality of device/technology is not consistent enough. The highest and the lowest ones are indicated. 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: Wma 9.1 - Windows Media Audio 9.1 (Standard) CBR, 193.8 kbit/s FBR Vorbis (aoTuV B4.51) - Ogg Vorbis, 192.8 kbit/s FBR usage: mppenc -quality 5.5 ref.wav out.mpc ![]() usage: lame -V 1 -vbr-new ref.wav out.mp3 Mp3 (iTunes 7.1) - MPEG-1 Layer 3 CBR, 192.3 kbit/s FBRĮNCODER: MP3 Encoder from iTunes 7.1.0.59 Use Variable Bit Rate Encoding (VBR): YesĪAC+ (Winamp 5.24) - MPEG-4 AAC High Efficiency CBR, 192.7 kbit/s FBRĬODER: MP4/aacPlus (HE-AAC) High Bitrate Encoder v1.2 from Winamp 5.24 usage: neroAacEnc.exe -q 0.63 -if ref.wav -of out.mp4ĭECODER: Nero Digital Audio Reference MPEG-4 & 3GPP Audio Decoder 1.0.0.2ĪAC (iTunes 6.0) - MPEG-4 AAC VBR Low Complexity, 195.1 kbit/s FBR usage: neroAacDec.exe -if out.mp4 -of out.wavĪAC (NeroRef 1002) - MPEG-4 AAC VBR Low Complexity, 193.3 kbit/s FBRĬODER: Nero Digital Audio Reference MPEG-4 & 3GPP Audio Encoder 1.0.0.2 usage: neroAacEnc.exe -q 0.60 -if ref.wav -of out.mp4ĭECODER: Nero Digital Audio Reference MPEG-4 & 3GPP Audio Decoder 1.5.1.0 AAC (NeroRef 1530) - MPEG-4 AAC Low Complexity, VBR, 190.9 kbit/s FBRĬODER: Nero Digital Audio Reference MPEG-4 & 3GPP Audio Encoder 1.5.3.0 (build )
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