Telit GE864 and GC864
Product Description
80273ST10008A Rev. 3 - 10/02/06
Reproduction forbidden without DAI Telecom written authorization – All Right reserved – Right of modification reserved
page 20 of 72
2.16 Audio levels specifications
The audio of the
GE864 / GC864
is organized into two main paths:
- internal path (called also MT)
- external path (called also HF)
These two paths are meant respectively for handset and headset/hands-free use. The
GE864 /
GC864
has a built in echo canceller and a noise suppressor, tuned separately for the two audio
paths; for the internal path the echo canceller parameters are suited to cancel the echo generated
by a handset, while for the external audio path they are suited for a hands-free use.
For more information on the audio refer to the Hardware User Guide.
The following table reports all the audio level specifications.
Microphone characteristics
Internal audio mic. input
External audio mic. input
Line coupling
AC (100nF cond.)
AC (100nF cond.)
Line type
Balanced Balanced
Differential input resistance
50k
Ω
50k
Ω
Line nominal sensitivity
50mV
rms
±2dB 3mV
rms
±2dB
Max input voltage
360mV
rms
22mV
rms
Microphone nominal sensitivity
– Analog Gain suggested
-45dB
Vrms/Pa
±2dB / +24dB
-45dB
Vrms/Pa
±2dB / +10dB
Echo canceller type
handset
Car kit hands free
Speaker characteristics
Internal audio ear. output
External audio ear. output
Line coupling
DC
DC
Line type
Bridged Bridged
Speaker impedance
≥
16
Ω
±
5% @ 1kHz
≥
16
Ω
±
5% @ 1kHz
Minimum load impedance
15
Ω
15
Ω
Signal bandwidth
150-8000 Hz @ -3dB
150-8000 Hz @ -3dB
Maximum output
1,3 V
rms
1,3
V
rms
Maximum power output
80mW/16
Ω
80mW/16
Ω
Volume level steps (SW)
-2dB
-2dB
Number of volume steps (SW)
14
14
