Panasonic EB-GD93, Техническое руководство

Страница: 27 / 46

BASEBAND OVERVIEW
MCUK001001G8 Section 6 Issue 1
Technical Guide – 23 – Revision 0
6.9. Speaker
6.9.1. Handheld Mode
Because OMEGA is powered from a 2.7 V supply, a low impedance (dynamic) speaker must be used. The GSM Standard
requires that the receiver audio frequency response must fit within the mask shown below.
Figure 6.5: Handheld GSM Receive Audio Frequency Response
The telephonehas been designed to meet requirements with a Type 1 artificial ear.
6.9.2. Desktop Handsfree (DTHF)
A second speaker is mounted in the rear case for DTHF operation. The GSM Standard requires that the receiver audio
frequency response must fit within the mask shown below.
Figure 6.6: Handsfree GSM Receive Frequency Response Mask
Volume Levels
Volume Level PGA Volume Total Gain
1 +1 dB 0 dB +1 dB
2 -2 dB 0 db -2 dB
3 -5 dB 0 dB -5 dB
4 -5 dB -6 dB -11 dB
dB
5
0
-5
-10
-15
100 1000 10000
Frequency (Hz)
10071-1
dB
0
-10
-5
-15
100 1000 10000
Frequency (Hz)
10072-1