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ZL38002 Datasheet(PDF) 29 Page - Zarlink Semiconductor Inc

Part # ZL38002
Description  Low-Voltage Acoustic Echo Canceller With Noise Reduction
PDF  47 Pages
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Manufacturer  ZARLINK [Zarlink Semiconductor Inc]
Direct Link  http://www.zarlink.com
Logo ZARLINK - Zarlink Semiconductor Inc

ZL38002 Datasheet(HTML) 29 Page - Zarlink Semiconductor Inc

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ZL38002
Data Sheet
29
Zarlink Semiconductor Inc.
Register Table 13 - STATUS Acoustic Echo Canceller Status Register (AECSR1)
Register Table 14 - Acoustic Echo Canceller Status register 2 (AECSR2)
Bit
Name
Description
7
ACMUTH
Energy comparison for mu value.’1’ indicates enough echo suppression.
6
ACMUND
When low, indicates that the Rin/Rout Receive path has no active signal.
5
HWLNG
When high indicates that howling is occurring in the loop. A related ’false
howling’ bit (HFLAG) in bit 5 of LSR is created as part of the howling-detect
decision making.
4
NLPUTH
Peak comparison with NLP up threshold.’1’ indicates not enough echo
suppression.
3
NLPDC
When high indicates that the NLP is activated.
2
DT
When high, double-talk is present.
1
NB
This bit indicates a LOGICAL-OR of status bits NBS + NBR (from LSR
register).
0
NBS
When high, a narrowband signal has been detected in the Send (Sin/Sout)
path.
Bit
Name
Description
7-4
Reserved
4
DHCLR
Indicate the divergence of adaptation. "1" indicates that strong divergence
occurs with error energy is at least double the input signal energy.
Reserved (anything written on it will be overwritten by temporary variable in
the program).
3
ACMUFL
Adaptation floor decision. ’1’ indicates the reference is below the adaptation
floor, no adaptation.
2
Reserved
1
ACMUNSP
Indicates strong near-end speech.
0
Reserved
Read Page 0, Address: 22H
Reset Value: 00H
76543210
ACMUTH
ACMUND
HWLNG
NLPUTH
NLPDCW
DT
NB
NBS
Read Page 0, Address: 23H
Reset Value: 00H
76543210
Reserved
Reserved
Reserved
DHCLR
ACMUFL
ACMULOW
ACMUNSP
NLPDCLD



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