peb20954 Infineon Technologies Corporation, peb20954 Datasheet - Page 104

• Manufacturer Part Number: peb20954
• Description: Smart Integrated Digital Echo Canceller Sidec
• Manufacturer: Infineon Technologies Corporation

Preliminary Data Sheet
ACSEFFECT
ACSCTH[4:0]
ACSTH[1:0]
ACONF[6:0] (Addr.: 79H): AFI Configuration, write protected, Reset value = 10H
EMAF
VDHYST
VDIHA
VDAT[3:0]
-
EMAF
ACSEFFECT specifies the effect of slow-down mode. If set to ’1’,
coefficient update is limited to increasing/decreasing by at most 1. If
set to ’0’, coefficient increment/decrement takes place in the normal
way of operation, but turbo mode is disabled. Per default (after reset)
it is not active.
’0’: normal operation
’1’: Disable turbo mode, Coeff. update limited to +/- 1
Aux. Coeff. Supervision Count Threshold:
ACSCTH specifies the threshold for activating the slow-down mode
of operation. Slow-down mode is active if at least 8 * ACSCTH
auxiliary coefficients are "large". The default value
ACSCTH[4:0]="00000" switches off supervision.
Aux. Coeff. Supervision Threshold:
ACSTH specifies the threshold above which the absolute value of
an auxiliary coefficient is considered "large". It refers to TURBOTH
in register ATMAT:
"00": ATMAT.TURBOTH - 32
"01": ATMAT.TURBOTH - 16
"10": ATMAT.TURBOTH - 8
"11": ATMAT.TURBOTH
Echo, Minimum Attenuation Factor for end echo path
’0’: Attenuation 0 dB (no attenuation)
’1’: Attenuation 6 dB
Voice Detection, Hysteresis On/Off:
VDHYST selects whether a hysteresis is used for switching off
"no-voice".
’0’: means that "no-voice" is active only if the
’1’: means that "no-voice" - once activated - remains
Voice Detection, Ignore High Amplitude:
’1’: received values with an amplitude above 126
’0’: all values are taken into account, no values are ignored
Specifies a lower limit on the amplitude of received
set of received values currently in the detection set
(AVDDI.VDINTERVAL) fulfill the "no-voice" criterion.
active for the time specified in AVDHG.VDSODELAY.
(logarithmic) are ignored for "no-voice" detection.
HYST
VD
IHA
VD
104
AT[3]
VD
AT[2]
VD
Register Description
AT[1]
VD
PEB 20954
PEF 20954
AT[0]
VD
04.99