Receiver; Loud Speaker - Panasonic GSM EB-A100 Service Manual

5.3.3. Receiver

The GSM Standard requires that the receiver audio frequency response must fit within the mask shown below.
(dB)
-5
-10
-15
The phone is designed to meet requirements with a Type 1 artificial ear.
Volume Level
1
2
3
4

5.3.4. Loud Speaker

A second speaker is mounted in the rear case for DTHF operation.
Ring tones and melodies are played via the loud speaker. The volume level of ring tones is defined by the 6-bit PWM register
setting in AD6537.
5
0
100
Figure 5.12. Handheld GSM Receive Audio Frequency Response
PGA
+1 dB
–2 dB
–5 dB
–5 dB
1,000
Frequency (Hz)
Volume
0 dB
0 dB
0 dB
–6 dB
– 5-12 –
10,000
Total Gain
+3 dB
–0 dB
–3 dB
–9 dB