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STA014B データシート(PDF) 28 Page - STMicroelectronics

部品番号 STA014B
部品情報  MPEG 2.5 LAYER III AUDIO DECODER WITH ADPCM AND SRS WOWO POSTPROCESSING CAPABILITY
PDF  45 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA014B データシート(HTML) 28 Page - STMicroelectronics

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BASS_FREQUENCY_LOW
Address: 0x79 (121)
Software Reset: 0x00
Hardware Reset: 0x00
MSB
LSB
b7
b6
b5
b4
b3
b2
b1
b0
BF7
BF6
BF5
BF4
BF3
BF2
BF1
BF0
BASS_FREQUENCY_HIGH
Address: 0x7A (122)
Software Reset: 0x00
Hardware Reset: 0x00
MSB
LSB
b7
b6
b5
b4
b3
b2
b1
b0
BF15 BF14 BF13 BF12 BF11 BF10
BF9
BF8
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)
Example:
Bass = 200Hz
Treble = 3kHz
TFS
15 14 13 12 11 10
9876543210
0000101110111000
BFS
15 14 13 12 11 10
9876543210
0000000011001000
TREBLE_ENHANCE
Address: 0x7B (123)
Software Reset: 0x00
Hardware Reset: 0x00
MSB
LSB
b7
b6
b5
b4
b3
b2
b1
b0
TE7
TE6
TE5
TE4
TE3
TE2
TE1
TE0
Signed number (2 complement)
This register is used to select the enhancement
or attenuation STA014 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/Enhancement range is
[-18dB, +18dB].
MSB
LSB
ENHANCE/ATTENUATION
b7
b6
b5
b4
b3
b2
b1
b0
1.5dB step
0
000
11
00
+18
0
0
0
0
1
0
1
1
+16.5
0
000
10
10
+15
0
0
0
0
1
0
0
1
+13.5
.
.
00000001
+1
00000000
0
11111111
-1
.
.
11110111
-13.5
11110110
-15
11110100
-16.5
11110100
-18
STA014-STA014B-STA014T
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