MT93L16 Mitel Networks Corporation, MT93L16 Datasheet - Page 18

• Manufacturer Part Number: MT93L16
• Description: CMOS Low-voltage Acoustic Echo CANceller
• Manufacturer: Mitel Networks Corporation

MT93L16
Register Summary
18
Reset 00h
Reset 00h
Reset 00h
Power Up
Power Up
Power Up
Address:
Address:
Address:
MUTE_R
BYPASS
MUTE_S
00h R/W
21h R/W
01h R/W
ADAPT-
ADAPT-
RESET
ECBY
HCLR
ECBY
HCLR
LIMIT
SHFT
AGC-
ASC-
ASC-
HPF-
NLP-
HPF-
NLP-
INJ-
INJ-
AH-
NB-
P-
MSB
MSB
When high, the power initialization routine is executed presetting all registers to default values.
This bit automatically clears itself to’0’ when reset is complete.
When high, the Howling detector is disabled and when low the Howling detector is enabled.
When high, AGC is disabled and when low AGC is enabled.
When high, Narrowband signal detectors in Rin and Sin paths are disabled and when low the signal detectors are enabled
When high, the Send and Receive paths are transparently by-passed from input to output and when low the Send and
Receive paths are not bypassed
When high, the Sin path is muted to quite code (after the NLP) and when low the Sin path is not muted
When high, the Rin path is muted to quite code (after the NLP) and when low the Rin path is not muted
When high, the 2-bit shift mode is enabled in conjunction with bit 7 of LEC register and when low 2-bit shift mode is
disabled
MSB
When high, the Echo estimate from the filter is not subtracted from the input (Sin), when low the estimate is subtracted
When high, the Echo canceller adaptation is disabled and when low the adaptation is enabled
When high, Adaptive filter coefficients are cleared and when low the filter coefficients are not cleared
When high, Offset nulling filter is bypassed in the Sin/Sout path and when low the Offset nulling filter in not bypassed
When high, the Noise filtering process is disabled in the NLP and when low the Noise filtering process is enabled
When high, the Non Linear Processor is disabled in the Sin/Sout path and when low the NLP is enabled
When high, the Internal Adaptation speed control is disabled and when low the Adaptation speed is enabled
When high, the Exponential weighting function for the adaptive filter is disabled and when low the weighting function is
enabled
When high, the Echo estimate from the filter is not substracted from the input (Rin), when low the estimate is substracted
When high, the Echo canceller adaptation is disabled and when low the adaptation is enabled
When high, Adaptive filter coefficients are cleared and when low the filter coefficients are not cleared
When high, Offset nulling filter is bypassed in the Rin/Rout path and when low the Offset nulling filter in not bypassed
When high, the Noise filtering process is disabled in the NLP and when low the Noise filtering process is enabled
When high, the Non Linear Processor is disabled in the Rin/Rout path and when low the NLP is enabled
When high, the Internal Adaptation speed control is disabled and when low the Adaptation speed is enabled
when high the 16-bit linear mode, inputs Sin, Rin, are shift right by 2 and outputs Sout, Rout are shift left by 2. This bit is
ignored when 16-bit linear mode is not selected in both ports. This bit is also ignored if bit 7 of MC register is set to zero
7
7
7
SHFT
LIMIT
P-
6
6
6
MUTE_R
ASC-
ASC-
Acoustic Echo Canceller Control Register (AEC)
Line Echo Canceller Control Register (LEC)
5
5
5
MUTE_S
NLP-
NLP-
Main Control Register (MC)
4
4
4
BYPASS
INJ-
INJ-
3
3
3
NB-
HPF-
HPF-
2
2
2
HCLR
HCLR
AGC-
Preliminary Information
1
1
1
ADAPT-
ADAPT-
AH-
0
0
0
RESET
ECBY
ECBY
LSB
LSB
LSB