Receiver; Loudspeaker - Panasonic EB-X300 Service Manual

5.3.3. Receiver

The GSM Standard requires that the receiver audio frequency response must fit within the mask shown below.
(dB)
-10
-15
The phone is designed to meet requirements with a Type 3.2 artificial ear.
Volume Level
1
2
3
4

5.3.4. Loudspeaker

A second speaker is mounted in the rear case for DTHF operation.
Ring tones and melodies are played via the loudspeaker. The volume level of ring tones is defined by the 6-bit PWM register
setting in U201.
5
0
-5
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