參數(shù)資料
型號(hào)： MT9122AP
廠商： Mitel Networks Corporation
英文描述： CMOS Dual Voice Echo Canceller with Tone Detection
中文描述： CMOS雙語音回聲消除的音偵測
文件頁數(shù)： 18/32頁
文件大?。?/td> 143K
代理商： MT9122AP
MT9122
Preliminary Information
8-34
Power Reset Value
00h
7
6
5
4
3
2
1
0
FD
7
FD
6
FD
5
FD
4
FD
2
FD
1
FD
0
FD
3
Echo Canceller A, Flat Delay Register
Echo Canceller B, Flat Delay Register
ADDRESS = 04h WRITE/READ VERIFY
ADDRESS = 24h WRITE/READ VERIFY
Power Reset Value
00h
7
6
5
4
3
2
1
0
NS
7
NS
6
NS
5
NS
4
NS
2
NS
1
NS
0
NS
3
Echo Canceller A, Decay Step Number Register
Echo Canceller B, Decay Step Number Register
ADDRESS = 07h WRITE/READ VERIFY
ADDRESS = 27h WRITE/READ VERIFY
Power Reset Value
04h
7
6
5
4
3
2
1
0
0
0
0
0
SSC
2
SSC
1
SSC
0
0
Echo Canceller A, Decay Step Size Control Register
Echo Canceller B, Decay Step Size Control Register
ADDRESS = 06h WRITE/READ VERIFY
ADDRESS = 26h WRITE/READ VERIFY
Note: Bits marked with “0” are reserved bits and should be written “0”.
SSC
NS
Amplitude of MU
Time
Flat Delay (FD
7-0
)
Step Size (SS)
1.0
2
-16
FIR Filter Length (512 or 1024 taps)
Number of Steps (NS
7-0
)
The Exponential Decay registers (Decay Step Number and Decay Step Size) and Flat Delay register allow the LMS adaptation
step-size (MU) to be programmed over the length of the FIR filter. A programmable MU profile allows the performance of the echo
canceller to be optimized for specific applications. For example, if the characteristic of the echo response is known to have a flat
delay of several milliseconds and a roughly exponential decay of the echo impulse response, then the MU profile can be
programmed to approximate this expected impulse response thereby improving the convergence characteristics of the adaptive
filter. Note that in the following register descriptions, one tap is equivalent to 125
μ
s (64ms/512 taps).
FD
7-0
Flat Delay
: This register defines the flat delay of the MU profile, (i.e., where the MU value is 2
-16
). The delay is defined
as FD
7-0
x 8 taps. For example; if FD
7-0
= 5, then MU=2
-16
for the first 40 taps of the echo canceller FIR filter. The valid
range of FD
7-0
is: 0 <= FD
7-0
<= 64 in normal mode and 0 <= FD
7-0
<= 128 in extended-delay mode.
The default value of
FD
7-0
is zero.
SSC
2-0
Decay Step Size Control
: This register controls the step size (SS) to be used during the exponential decay of MU. The
decay rate is defined as a decrease of MU by a factor of 2 every SS taps of the FIR filter, where
SS = 4 x2
SSC
2-0
. For
example; If SSC
2-0
= 4, then MU is reduced by a factor of 2 every 64 taps of the FIR filter.
The default value of SSC
2-0
is 04h.
NS
7-0
Decay Step Number
: This register defines the number of steps to be used for the decay of MU where each step has a
period of SS taps (see SSC
2-0
). The start of the exponential decay is defined as:
Filter Length (512 or 1024) - [ Decay Step Number (NS
7-0
) x Step Size (SS) ]
where
SS = 4 x2
SSC
2-0
.
For example, if NS
7-0
=4 and SSC
2-0
=4, then the exponential decay start value is
512 - [NS
7-0
x SS] = 512 - [4 x (4x2
4
)] =
256
taps for a filter length of 512 taps.
FD
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MT9123 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CMOS Dual Voice Echo Canceller
MT9123AE 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 2CH G.165/G.711 W/OUT TONE DETECTION 28P - Rail/Tube
MT9123AE1 制造商:Microsemi Corporation 功能描述:
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