sta015t STMicroelectronics, sta015t Datasheet - Page 28

• Manufacturer Part Number: sta015t
• Description: Mpeg 2.5 Layer Iii Audio Decoder With Adpcm Capability
• Manufacturer: STMicroelectronics

STA015-STA015B-STA015T
BASS_FREQUENCY_LOW
Address: 0x79 (121)
Software Reset: 0x00
Hardware Reset: 0x00
BASS_FREQUENCY_HIGH
Address: 0x7A (122)
Software Reset: 0x00
Hardware Reset: 0x00
The registers BASS_FREQUENCY_HIGH and
BASS_FREQUENCY_LOW, logically concate-
nated as a 16 bit wide register, are used to select
the frequency, in Hz, where the selected fre-
quency is -12dB respect to the pass-band. By
setting the BASS_FREQUENCY registers, the
following rules must be kept:
Bass_Freq <= Treble_Freq
Bass_Freq > 0
(suggested range: 20 Hz < Bass_Freq < 750 Hz)
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BF15 BF14 BF13 BF12 BF11 BF10 BF9
MSB
MSB
BF7
MSB
b7
b7
b7
0
0
0
0
0
0
1
1
1
1
1
BF6
b6
b6
b6
0
0
0
0
0
0
1
1
1
1
1
BF5
b5
b5
b5
0
0
0
0
0
0
1
1
1
1
1
BF4
b4
b4
b4
0
0
0
0
0
0
1
1
1
1
1
BF3
b3
b3
b3
1
1
1
1
0
0
1
0
0
0
0
BF2
b2
b2
b2
1
0
0
0
0
0
1
1
1
1
1
BF1
b1
b1
b1
LSB
LSB
BF0
BF8
0
1
1
0
0
0
1
1
1
0
0
b0
b0
LSB
b0
.
.
.
.
0
1
0
1
1
0
1
1
0
0
0
Example:
Bass = 200Hz
Treble = 3kHz
TFS
BFS
TREBLE_ENHANCE
Address: 0x7B (123)
Software Reset: 0x00
Hardware Reset: 0x00
Signed number (2 complement)
This register is used to select the enhancement
or attenuation STA015 has to perform on Treble
Frequency range at the digital signal.
A decrement (increment) of a decimal unit corre-
sponds to a step of attenuation (enhancement) of
1.5dB.
The allowed Attenuation/Enhan cement range is
[-18dB, +18dB].
15 14 13 12 11 10 9
15 14 13 12 11 10 9
MSB
0
0
TE7
b7
0
0
0
0
TE6
b6
0
0
1
0
TE5
ENHANCE/ATTENUATION
b5
0
0
1
0
TE4
b4
1.5dB step
8
1
8
0
+16.5
+13.5
-13.5
-16.5
+18
+15
-15
-18
+1
-1
0
7
1
7
1
TE3
b3
6
0
6
1
5
1
5
0
TE2
b2
4
1
4
0
3
1
3
1
TE1
b1
2
0
2
0
1
0
1
0
LSB
TE0
b0
0
0
0
0