16.1.8
Proximity Pairing
Proximity pairing is headset-initiated pairing and it simplifies the out-of-box pairing process. Proximity pairing enables
the headset to find the closest discoverable phone. The headset then initiates the pairing activity and the user simply
has to accept the incoming pairing invitation on the phone.
This means that the phone-user does not have to hunt through phone menus to pair with the new headset.
Depending on the phone UI:
■
For a Bluetooth v2.0 phone the headset pairing is with a PIN code
■
For a Bluetooth v2.1 (or above) phone the headset pairing is without a PIN code
Proximity pairing is based on finding and pairing with the closest phone. To do this, the headset finds the loudest
phone by carrying out RSSI power threshold measurements. The loudest phone is the one with the largest RSSI
power threshold measurement, and it is defined as the closest device. The headset then attempts to pair with and
connect to this device.
Proximity pairing is configurable using the Headset Configurator tool available from
16.1.9
Proximity Connection
Proximity connection is an extension to proximity pairing, see Section 16.1.8. It enables the headset‑user to take
advantage of the proximity of devices each time the headset powers up and not just during a first time pairing event.
Proximity connection enables a user with multiple handsets to easily connect to the closest discoverable phone by
comparing the proximity of devices to the headset at power-on to the list of previously paired devices.
Proximity connection speeds up the headset connection process. It requires the headset to initiate a SLC connection
to the nearest device first and combines this with the headset's storage of the last 8 paired/connected devices. Using
proximity connection means functions like
power on into an incoming call
operate equally well for the most recently
paired or connected device, as well as the least recently paired or connected device.
16.2
6
th
Generation 2-mic CVC Audio Enhancements
2-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 echo and noise‑cancelling headset products.
CVC enables greater acoustic design flexibility by incorporating software to compensate for cost-optimised
microphone‑to‑speaker coupling and placement. CVC-enabled headsets operate in a wide variety of acoustic
environments. Sophisticated noise suppression technology reduces the impact of noise in the transmission channel.
Using intelligent volume control and intelligibility improvements, the receive channel is also enhanced based on the
acoustic noise in the listener's environment.
The 6
th
generation CVC provides 3 new major features:
■
A high performance Wind Noise Reduction module provides significant reduction of both front and side
wind noise. This uses a very low-power algorithm which automatically cuts in only on the detection of wind
noise.
■
A 16kHz sample rate for full compliance across the suite of DSP algorithms
■
Frequency enhanced speech intelligibility
2-mic CVC includes a tuning tool enabling the developer to easily adapt CVC with different audio configurations and
tuning parameters. The tool provides real-time system statistics with immediate feedback enabling designers to
quickly investigate the effect of changes.
Figure 16.3 shows the functional block diagram of CSR’s proprietary 2-mic CVC DSP solution for a dual-microphone
headset product.
Advance Information
This material is subject to CSR's non-disclosure agreement
© Cambridge Silicon Radio Limited 2011
Page 96 of 110
CS-209182-DSP1
CSR8640 BGA
Data Sheet
