CSR8635 查看數據表（PDF） - CSR plc
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CSR8635 Datasheet PDF : 105 Pages
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Proximity connection speeds up the device connection process. It requires the device to initiate a SLC connection to
the nearest device first and combines this with the device's storage of the last 8 paired/connected devices. Using
proximity connection means functions operate equally well for the most or least recently paired or connected device.
16.2 6th Generation 1-mic CVC ENR Technology for Hands-free and Audio
Enhancements
1-mic CVC full-duplex voice processing software is a fully integrated and highly optimised set of DSP algorithms
developed to ensure easy design and build of hands-free products.
CVC enables greater acoustic design flexibility for a wide variety of environments and configurations as a result of
sophisticated noise and echo suppression technology. CVC reduces the affects of noise on both sides of the
conversation and smartly adjusts the receive volume levels and dynamically frequency shapes the voice to achieve
optimal intelligibility and comfort for the hands-free user.
013 The 6th generation CVC features include:
7, 2 ■ Full-duplex AEC
r 2 ■ Bit error and packet loss concealment
be ■ Transmit and receive noise suppression including WNR
tem ■ Transmit and receive Parametric Equalisation
p ■ Transmit and receive AGC
Se ■ Noise dependent volume control
ay, ■ Receive frequency enhanced speech intelligibility using adaptive equ liser
rid ■ Narrowband, wideband and frequency expansion operations
n - F 1-mic CVC includes a tuning tool enabling the developer to easily adapt CVC with different audio configurations and
.c tuning parameters. The tool provides real-time system statistics with immediate feedback enabling designers to quickly
om investigate the effect of changes.
int.c Figure 16.3 shows the functional block diagram of CSR’s proprietary 1-mic CVC DSP solution for a hands-free product.
n.zhou - excelpo Send In
Mic
Gain
Acoustic Echo
Canceller
Noise
Suppression
NDVC
Nonlinear
Processing
Howling
Control
Comfort Noise
Send Equaliser
Send AGC
for qingbo keve Receive Out
Prepared Speaker Gain
Auxiliary
Stream Mix
Clipper
Receive AGC
Receive
Equaliser
Adaptive
Equaliser
Noise
Suppression
Packet Loss
Concealment
Figure 16.3: 1-mic CVC Block Diagram
Send
Out
Receive
In
Section 16.2.1 to Section 16.2.13 describe the audio processing functions provided within CVC.
16.2.1 Acoustic Echo Cancellation
The AEC includes:
■ A referenced sub-band adaptive linear filter that models the acoustic path from the receive reference point to
the microphone input
■ A non-linear processing function that applies narrowband and wideband attenuation adaptively as a result of
residual echo present after the linear filter.
Production Information
© Cambridge Silicon Radio Limited 2013
Confidential Information - This Material is Subject to CSR's Non-disclosure Agreement
Page 92 of 105
CS-303725-DSP5
www.csr.com
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