ADC ACE-COM L1 Bedienungsanleitung PDF herunterladen (Seite 6)

6

Vybrid Automotive Solutions Based on ARM

®

Technology

VCP Features and Performance

• Supportedsamplingrates:8kHz,16kHz

• Fastfilterconvergence(<300ms)withno

initial echo

• Convergenceindoubletalkandintense

noise

• Robustnesstospeakersignaldistortion

• Echocancellerfilterlengthupto500ms

• Residualecholevel(echosuppression

level):upto-70dB

• Noisesuppressionupto-30dB

• Noiseadaptationtime:100–700ms

(depending on noise type)

• MaximalAGCgain:24dB

are “must have” for virtually any full-duplex,

hands-free voice communication system. It

also includes control blocks adding flexibility

and ease of system debugging, testing and

acoustic tuning. Add-on blocks include

technologies providing additional benefits to

end users.

Development and Tuning

Tools: VCP Configurator

VCP Configurator is a PC Windows

graphical application allowing controlling

VCP functionality. All VCP blocks and their

parameters are shown according to their real

position in the signal processing chains. All

parameters are provided with short prompts

as well as detailed help. VCP configurator

generates an acoustic profile structure that can

be uploaded into a device under tuning in real

time via UART or other available interface.

Alango Voice

Communication

Package

Voice processing and echo

cancellation

The Alango Voice Communication Package

(VCP) is a suite of digital signal processing

technologies enabling high-quality voice

communication for a variety of applications,

including automotive hands-free, mobile

phones, Bluetooth headsets, audio and

videoconferencing systems, intercom systems

and others. VCP was designed to enable the

highest possible voice quality in various acoustic

environments while consuming relatively low

MIPS and memory resources. VCP provides

natural support for narrowband (8 kHz) and

wideband (16 kHz) speech. For wideband

speech, VCP implements special mechanisms

providing significant reduction of MIPS and

memory requirements compared to doubling

them with the brute-force approach without a

noticeable degradation of output speech quality.

The current seventh VCP generation

accumulates many years of practical Alango

experience to provide a scalable, highly optimized

solution for voice communication applications.

Beyond software DSP technologies, Alango

has developed a unique set of auxiliary software

and hardware tools facilitating development,

debugging, testing, acoustic tuning, problem

identification and reporting.

VCP Components and

Structure

VCP consists of basic, control and add-on

blocks. Basic VCP comprises technologies that

Figure 1: VCP structure and signal flow

VCP Structure and Signal Flow

EQ AVQ

Mic

Noise

Speech

Echo

Mic

Spk

Uplink

Signal

Log

Data

Downlink

Signal

Proﬁle

Basic VCP

Adaptive

Microphone

Array

Acoustic

Echo

Canceller

Noise

Suppressor

AGC/DRC

VCP Add-ons Control

EQ

Easy Listen

Noise

Suppressor

AGC/DRC

Proﬁle Manager

Data Logger

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