PT8401 Datasheet, PDF (17/28 Pages) Princeton Technology Corp – MP3 Audio Decoder

Princeton Technology Corp.
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MP3 Audio Decoder
PT8401
TONE AND 3D CONTROL COMMANDS
Tone control is allowable. It ranges up to +-15 dB cut or enhancement for bass and treble filter with
step size of 1.5 dB. Although overflow prevention is performed, under the Bass Enhancement Mode,
the gain may be reduced so that overflow may be prevented in advance by issuing the prescale
command. This would generate better listening results.
The cut off frequency for bass filter is about 250Hz for MPEG1, 125Hz for MPEG2.
The cut off frequency for treble filter is about 10kHz for MPEG1, 5kHz for MPEG2.
The 3D Mode controls the 3D effect function. Please take note that if the 3D Mode is enabled, the tone
and balance controls are disabled.
Address
0x50
0x51
0x52
0x53
0x54
Register
Description
Default R/W
Name
Tone3D "0" : Enable Tone Control.
0x0 R/W
"1" : Enable 3D Control.
Bass "0x1" to "0xa" with step size 1.5dB bass enhancement.
0x0 R/W
Maximum up to 15 dB.
"0xb" to "0x14" with step size 1.5dB bass attenuation..
Minimum down to –15 dB
Default is" 0x0", no enhancement.
Treble "0x1" to "0xa" with step size 1.5dB treble enhancement. 0x0 R/W
Maximum up to 15 dB.
"0xb" to "0x14" with step size 1.5dB treble attenuation.
Minimum down to –15 dB.
Default is "0x0", no enhancement.
Prescale Prescale command to reduce overall gain. Range is between 0x0 R/W
0dB(0x0) and –96dB(0x60)
3D_Effect Control the Depth of 3D’s Effect. Range is between
0x3 R/W
between 0dB(0x0) and –96dB(0x60)
PT8401 v 1.3
Page 17
Updated March 2002