Sharp VL-C780S Serviceanleitung Seite 178

VL-C780S/H/X
|
VL-C7400
VL-C690S/H/X
VL-C6400E
3-1. Flow of signal
BIAS
Osc
iz REC bias level
FS
a Audio-REC
SP I audio-Ps
. ) Audio head
PBON =
1C601
4 VHiBA7757BK-1 <—®
Earphone
jack
a aod ®
Micin
a Pt
D
| MicGnD | GN i602
Microphone unit
reno
PB level
ar
Figure 3-1. Audio Circuit Block Diagram
3-2. Frequency characteristics
1. EEsystem
General frequency characteristics of external microphone EE system are shown in Fig. 3-2.
In the external microphone EE system, high and low bands are damped by the MIC-Amp (between
® and
® in Fig. 3-1) in order to eliminate extra noise, and jump-in of horizontal oscillation frequency 15.625 kHz
from the video system is prevented by the LPF (between © and © in Fig. 3-1).
"Ne
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