參數(shù)資料
型號(hào)： ZL38002QDG1
廠商： ZARLINK SEMICONDUCTOR INC
元件分類： 數(shù)字傳輸電路
英文描述： Low-Voltage Acoustic Echo Canceller With Noise Reduction
中文描述： DATACOM, ISDN ECHO CANCELLER, PQFP48
封裝： 7 X 7 MM, 1 MM HEIGHT, LEAD FREE, MS-026ABC, TQFP-48
文件頁(yè)數(shù)： 6/47頁(yè)
文件大小： 440K
代理商： ZL38002QDG1
ZL38002
Data Sheet
6
Zarlink Semiconductor Inc.
1.0 Functional Description
The ZL38002 device is comprised of an acoustic echo canceller and the necessary control functions for operation.
The ZL38002 guarantees clear signal transmission in both transmit and receive audio path directions to ensure
reliable voice communication, even when low level signals are provided. The ZL38002 does not use variable
attenuators during double-talk or single-talk periods of speech, as do many other acoustic echo cancellers for
speakerphones. Instead, the ZL38002 provides high performance full-duplex operation similar to network echo
cancellers. This results in users experiencing clear speech and uninterrupted background signals during the
conversation and prevents subjective sound quality problems associated with “noise gating” or “noise contrasting”.
The ZL38002 uses an advanced adaptive filter algorithm that is double-talk stable, which means that convergence
takes place even while both parties are talking. This algorithm allows continual tracking of changes in the echo
path, regardless of double-talk, as long as a reference signal is available for the echo canceller.
The echo tail cancellation capability of the acoustic echo canceller has been sized appropriately (112 ms) to cancel
echo in an average sized office with a reverberation time of less than 112 ms.
In addition to the echo cancellers, the following functions are supported:
12 dB of noise reduction
User gain pads at the Sin and Sout ports plus one at the input of adaptive filter (XRAM)
Control of adaptive filter convergence speed during periods of double-talk, far end single-talk and near-end
echo path changes
Control of Non-Linear Processor thresholds for suppression of residual non-linear echo
Howling detector to identify when instability is starting to occur and to take action to prevent oscillation
Narrow-Band Detector for preventing adaptive filter divergence caused by narrow-band signals
Programmable high pass filters at Rin and Sin for removal of DC components in PCM channels
Limiters that introduce controlled saturation levels
Serial controller interface compatible with Motorola, National and Intel microcontrollers
PCM encoder/decoder compatible with m/A-Law ITU-T G.711, m/A-Law Sign-Mag or linear 2’s complement
coding
Automatic gain control on the receive speaker path
Idle channel noise suppression
1.1 Noise Reduction
The ZL38002 incorporates a noise reduction circuit that reduces background noise up to 12 dB. The level of noise
reduction is programmed allowing the user to adjust the level of noise cancellation according to system
requirements. This is controlled through the NR register on page 3 address 16
H
. A larger value in this register will
increase the amount of noise reduction. As the amount of noise reduction is increased the amount of distortion in
the audio path also increases. The noise reduction can be bypassed by setting bit 4 in Control Register 1 (Address
01
H
)
1.2 Noise Suppression
The ZL38002 also utilizes noise suppression which can be used to reduce idle channel noise from emanating from
the acoustic end. By setting a threshold value in the lower nibble (bits 0-3) of the MCR2 register on page 0 address
01
H
, idle channel noise below the threshold is zero-forced. The threshold limits ranges from 0 to 16 (based on a 16
bit 2's complement) with a value of 0 disabling suppression.
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