A new high quality sound check 為了 pink noise (band limited) level calibration。
粉紅噪音頻帶限制（400 Hz 至 2.5 KHz）
Bit rate: 320kbps
Length: 00:01.03
Download MP3 File – Pink Noise Band Limited
Pink noise is acoustical energy distributed uniformly by octave throughout the audio spectrum (the range of human hearing, approximately 20 Hz to 20 kHz). Most people perceive pink noise as having uniform spectral power density — the same apparent loudness at all frequencies. In pink noise, the total sound power in each octave is the same as the total sound power in the octave immediately above or below it. An octave is a band whose highest frequency is exactly twice its lowest frequency.
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