User's Manual

APPLICANT: MOTOROLA, INC. FCC ID: IHDT6AC1
Exhibit 8
37
4.3.2 Analog Audio.
The D15 is driving out the analog audio detected by the radio.
The D15 is not including any audio drivers. The user have to
include the audio drivers in is application.
An example for audio drivers can be seen in the EV board
appendix ??.
The D15 can provide the analog audio in two ways:
- Analog audio to by drived to an Headset – Default.
- Analog audio with Echo canceller activated – for Hands free
applications.
When an Headset is used in the user application than audio
drivers for the headset are needed.
When an external Speaker and Microphone are used drivers for
them are required and activation of Echo canceller in the D15
DSP is required.
To activate the Echo canceller you need to type an AT command
in the Data port.
ATs96=1 will activate the Echo canceller.
ATS96=0 will disable the Echo canceller.
The block diagram for the required drivers are shown below,
But detailled example of drivers design you can see the
Evaluation board design, Pharagraph ???.