TMS320WP010 Datasheet, PDF (5/18 Pages) Texas Instruments – DIGITAL SIGNAL PROCESSOR FOR AEC/LEC/ANS

TMS320WP010
DIGITAL SIGNAL PROCESSOR
FOR AEC/LEC/ANS
SPRS040–OCTOBER 1995
architecture
The ’WP010 architecture is based on the TMS320C5x Digital Signal Processor as shown in Figure 1. The
’WP010 sends/receives data through two serial ports available in the device. The first serial port (both RX1 and
TX1) should be connected to the audio codec to interface with the phone line (in the cradle). The other serial
port (RX2 and TX2) should be connected to the audio codec for the microphone and the speaker interfaces.
The necessary software for the ’WP010 is ROM-coded and contained in ROM space. The ’WP010 also provides
an MCU control interface to receive control commands from an MCU. The MCU control commands include the
ability to reset the ’WP010 and to enable/disable some functions of the ’WP010.
TX1
To Audio
Codec
RX1
DSP Core
TMS320C5X
ROM
RAM
RX2
To Audio
Codec
TX2
MCU Control
Figure 1. TMS320WP010 Architecture
functional description
The ’WP010 contains three main functional blocks: the adaptive line echo canceler, the adaptive acoustic echo
canceler, and the adaptive noise suppressor. All three functions can be enabled or disabled by MCU control
commands.
line echo canceler
The line echo canceler is to cancel the feedback line echo between two ports: RX1 and TX1. This function is
performed by estimating the line echo path adaptively and subtracting it from the input signal. The line echo
canceler cancels up to 16 milliseconds of line echo.
acoustic echo canceler
The purpose of the acoustic echo canceler (AEC) is to cancel the feedback acoustic echo from TX2 (interfaced
with the speaker) to RX2 (interfaced with the microphone). The signal from the microphone (via RX2) is
subtracted from the estimate of the acoustic echo path. The acoustic echo canceler is capable of canceling an
echo up to 44 milliseconds long.
adaptive noise suppressor
The purpose of the adaptive noise suppressor (ANS) is to selectively suppress noise from the signal coming
from the microphone (via RX2) without distorting near-end speech. Near-end speech is the desired speech
signal of the user of the hands-free phone in a car. The adaptive noise suppressor tracks noise characteristics
and suppresses accordingly. The ANS can suppress noise up to 10 dB.
development support
Texas Instruments offers a demonstration platform for the ’WP010. This platform contains all software modules
including AEC, LEC, and ANS. There are switches that allow the algorithms to be turned on and off. The
demonstration platform can be used in a lab or an automobile to fully evaluate the performance of the ’WP010.
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