我认为是41段是完全寂静，42段是极弱的高频噪声测试
The Sheffield-A2TB Test Disc: 'My Disc' (A)
TRACK 01 "The Power of Seven - Up Front / Stranger In My Bed"
TRACK 02 "Thelma Houston - I've Got The Music In Me / Dish Rag"
TRACK 03 "Prokofiev's - Romeo & Juliet / Dance of the Knights"
TRACK 04 "Adam Makowicz with Phil Woods - The Name is Makowicz / Dirty Blue"
TRACK 05 "Michael Ruff - Speaking In Melodies / Wishing Well"
TRACK 06 "Lincoln Mayorga & Distinguished Colleagues - Vol. III / Dock of the Bay"
TRACK 07 "1 KHz sinewave at -20 dBFS"
TRACK 08 "1 KHz sinewave at 0 dBFS"
TRACK 09 "20 Hz one octive warble"
TRACK 10 "62 Hz one octive warble"
TRACK 11 "125 Hz one octive warble"
TRACK 12 "250 Hz one octive warble"
TRACK 13 "500 Hz one octive warble"
TRACK 14 "2.5 KHz one octive warble"
TRACK 15 "5 KHz one octive warble"
TRACK 16 "10 KHz one octive warble"
TRACK 17 "15 KHz one octive warble"
TRACK 18 "19 KHz one octive warble"
TRACK 19 "Person Counting from 1 to 25"
TRACK 20 "Right Channel Identification"
TRACK 21 "Left Channel Identification"
TRACK 22 "Relative polarity between left & right channels"
TRACK 23 "Polarity pulses"
TRACK 24 "1 KHz sinewave with bottom half clipped"
TRACK 25 "3 people describing position on sound stage in stereo"
TRACK 26 "Same as track 25 except talking simultaneously"
TRACK 27 "Music for evaluating accuracy and focus of sound stage in stereo"
TRACK 28 "Same as track 27 except in mono (L + R)"
TRACK 29 "Same as track 28 except sent to left channel only"
TRACK 30 "Same as track 28"
TRACK 31 "Same as track 28 except sent to right channel only"
TRACK 32 "Same as track 27"
TRACK 33 "Music recorded with normal transfer level of 0 dB"
TRACK 34 "Music recorded withl transfer level of -10 dB"
TRACK 35 "Music recorded withl transfer level of -20 dB"
TRACK 36 "Music recorded withl transfer level of -30 dB"
TRACK 37 "Music recorded withl transfer level of -40 dB"
TRACK 38 "Music recorded withl transfer level of -50 dB"
TRACK 39 "Music recorded withl transfer level of -60 dB"
TRACK 40 "Music recorded withl transfer level of -70 dB"
TRACK 41 "Recording of Digital Black or 0 bits"
