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© Cambridge Silicon Radio Limited 2014
CS-310152-UGP1
www.csr.com
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5.5.
Wired Mode
The wired mode feature is enabled or disabled using the Application Features configuration data, described in
section 4.1.
When wired mode is enabled, the ADK 3.0 Subwoofer application routes audio from the ADC input through the DSP
and out to the speaker.
5.5.1. Wired Mode Operation
For wired mode to be active, the device must be disconnected from its paired device, when in wired mode, the DSP
is loaded and monitors the ADC input of the device, while there is no audio signal present on the input, the device
does nothing other than monitor it.
As soon as an audio signal is detected on the ADC input, the ADK 3.0 Subwoofer application turns on and un-mutes
the amplifier so the audio signal can be rendered by the speaker.
Wired mode is in operation for both discoverable and connecting states.
As soon as a Bluetooth connection is established with the paired device, wired mode is disabled.
5.5.2. Wired Mode EQ Filters
The wired mode supports audio processing through the use of digital EQ Banks.
3 EQ banks are supported by the ADK 3.0 Subwoofer application. The EQ banks are designed to apply different
levels of low pass filtering on the input audio source. The EQ banks can be cycled through using the
EQ Select
button, which can be configured in the button configuration data, as described in section 4.5.
The EQ banks can be configured using the CSR Universal Frond End application and then downloaded to the ADK
3.0 Subwoofer.
5.5.3. Wired Mode Volume Control
When in wired mode,
Volume Up
and
Volume Down
buttons are used to control the audio gain of the output signal.
The volume gain is applied digitally by the ADK 3.0 Subwoofer DSP application, and the volume table mapping can
be re-configured using the CSR Universal Front End application and then downloaded to the ADK 3.0 Subwoofer.
The
Volume Up
and
Volume Down
buttons can be configured in the button configuration data, as described in section
4.5.
