Panasonic EB-GD30, Техническое руководство

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BASEBAND OVERVIEW
MCUK991001G8 Section 6 Issue 1
Technical Guide – 23 – Revision 0
When using the hands free feature, GSM requires that the sending audio frequency response must fit within the mask shown
below.
Figure 6.6: Hands Free GSM Transmit Audio frequency response mask
6.2.9 Speaker
Because Vega runs from a 2.7 V supply, a low impedance (dynamic) speaker must be used. The GSM standard requires that
the receive audio frequency response in Handheld use must fit within the mask shown below. GD30 and GD50 is designed to
meet Handheld requirements with a Type 1 artificial ear.
Figure 6.7: Handheld GSM Receive Audio frequency response
Volume levels
Volume level PGA Volume Total Gain
1 3dB 0dB 3dB
2 0dB 0dB 0dB
3 -3dB 0dB -3dB
4 -3dB -6dB -9dB
dB
5
-10
0
-5
-15
100 1000 10000
Frequency (Hz)
10070-1
dB
5
0
-5
-10
-15
100 1000 10000
Frequency (Hz)
10071-1