NTP3000 View Datasheet(PDF) - Unspecified
Part Name
Description
MFG CO.
'NTP3000' PDF : 37 Pages View PDF
Power Integrated Processor for Digital Amplifier
NTP3000
NTP3000 realizes the 3D effect by combining delay and band-pass filter. At first, define the size of delay
by using register Address 0x60. Possible maximum delay is 40 samples delay and this is about 0.4msec
based on 96kHz signal input.
And then download the band-pass filter coefficients to internal memory of NTP3000(same with the
biquad filter coefficient download procedure). The BPF is two 2nd order IIR filter. Each channel can have
different BPF. Change the 3D flag status of register Address 0x3F to ‘enable coefficient write’ status and
write the actual coefficient values to twenty register Addresses 0x40~ 0x53. Also, internal 2x2 mixer
helps ease of design. For using 3D mixer, download the gain values to four register Addresses
0x5C~0x5F.
Ch 1
Ch 2
+
+
2x2
Mixer
BQ2
BQ2
BQ1
BQ1
Delay
Figure 16 3D surround Diagram
8.4. Configurable Graphic Equalizer
NTP3000 provides 7 or 5 band graphic equalizer and tone control to 1/2 channel. EQ on/off can be
selected by GEQC flag of register Address 0x06.
The gains for each band can be controlled by writing the gain values (refer Graphic equalizer band gain
table in Appendix 2) to register Addresses 0x32~36 respectively.
In tone control mode the BQ1 ~ BQ5 can be used as programmable biquad filters.
0
BQ1 BQ2 BQ3 BQ4 BQ5 BQ6 BQ7
1
BQ1 BQ2 BQ3 BQ4 BQ5 BQ6 BQ7
1
0
Figure 17 GEQ filter structure
8.5. Post Biquad Filter Chain
The post biquad filter chains of NTP3000 can be used in various purposes - bass management, loudness
control, parametric EQ, loud-speaker EQ, etc.Independent filter design for 1, 2 channels are possible and
five 2nd order floating point parametric filters are linked serially. Especially for loudness control, as shown
in Figure 18, last 3 filters are different from first 2 filters.
Filter coefficients are 32-bit floating point numbers and can be downloaded thru I2C interface. To
download post biquad filter coefficients to NTP3000, select download channel by using CH flag in
register Address 0x3F first. And then write actual coefficient values to 25 register Addresses, from 0x40
to 0x58.
Copyright © NeoFidelity, Inc. 2005
Preliminary datasheet – NeoFidelity reserves the right to change specifications at any time without prior notice
14
R0.73-11.2006
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