NTP3000 View Datasheet(PDF) - Unspecified
Part Name
Description
MFG CO.
'NTP3000' PDF : 37 Pages View PDF
Power Integrated Processor for Digital Amplifier
NTP3000
CH 1
CH 2
CH 3
0
BQ1
1
0
BQ1
1
0
BQ1
1
0
BQ2
1
0
BQ2
1
0
BQ2
1
Figure 14 Biquad Filter Structure
Filter coefficients are 32-bit floating point numbers and can be downloaded thru I2C interface. To
download the pre-biquad filter coefficients to internal memory of NTP3000, designer should change the
Various 1 for Channel 1&2 and Various 2 for Channel 3 flags of register Address 0x3F to ‘enable
coefficient write’ status. And then write the actual coefficient values to ten register Addresses, from 0x40
to 0x53.
When Various 1 Flag of Address 0x3F is set to 1, Address 0x40~44 designates coefficients of 1st pre-
biquad filter chain of channel 1 and indicates b0, b1, b2, a1, a2 respectively. Address 0x45~49
designates the coefficients of 2nd chain of channel 1, 0x4A~4E for 1st chain of channel 2, and 0x4F~53
for 2nd chain of channel 2.
When Various 2 Flag of Address 0x3F is set to 1, Address 0x40~44 designates coefficients of 1st pre-
biquad filter chain of channel 3 and Address 0x45~49 designates the coefficients of 2nd chain of channel
3,
The biquad filter structure is shown in Figure 15.
b0
x
+
b1
Z-1
x
a1
x
Z-1
b2
Z-1
x
a2
x
Z-1
Figure 15 Biquad Filter Structure
8.3. 3D Surround
3D surround expands the sound field of two channel stereo to the extent that is wider than the actual
speaker spacing. Because this feature is acoustically valid for two channel signal, no other channels
except channel 1/2 have this internal block.
Copyright © NeoFidelity, Inc. 2005
Preliminary datasheet – NeoFidelity reserves the right to change specifications at any time without prior notice
13
R0.73-11.2006
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