User Guide

After Sales
Technical Documentation
Handsfree Desktop Charger CHH–7
Original, 11/94Page 8
AC Characteristics
Table 5. External Microphone signal
XMIC (1 kHz) TYPICAL/NOMINAL
Cable level
0 dBmO
200mV
415mV
Table 6. Handsfree Microphone Signal
HFMIC (1 kHz) TYPICAL/NOMINAL
MRP +15.3dBPa / 50 cm (Mic Ref Point)
HFMIC input –4.7dBPa (approx 20dB attenuation)
Gain for HFMIC 40dB
Cable Level 200mV
Table 7. External Earphone Signal
XEAR (1 kHz) TYPICAL/NOMINAL
Cable Level
0 dBmO
130mV
411mV
Table 8. Handsfree Speaker Signal
HFSP (1kHz) TYPICAL/NOMINAL
Cable Level 130mV
Gain for HFSP 23dB
Table 9. Audio Specifications
f = 1 kHz MINIMUM TYPICAL/NOMINAL MAXIMUM
HF Microphone Sensitivity (0dB = 1V/Pa) –44dB –42dB –40dB
Sending Idle Noise –61dBmO
HF Speaker: SPL (1W @ 1m) +78dB +80dB +82dB
Receiving Idle Noise –52dBPa (A)
Speaker Output Power 1W/8Ω