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5. AUDIO CIRCUIT DESCRIPTION
5-1 . OUTLINE
There are four types of audio recording systems.
1 . FM Audio (monaural)
2. FM Audio (stereo)
3. PCM Audio (stereo)
4. AUX Audio (monaural)
[FM audio standards]
Carrier wave
frequency fA
Maximum frequency
!'1
deviation
f
Recording current IA/IC
Noise reduction
Recording FM signal
band width
Standard frequency
deviation
[Noise reduction standards ]
The noise reduction standards for FM audio (monaural and
stereo) and PCM audio are the same for this unit.
Pre-emphasis
(
Compression ratio
Pre - emphasis 1
Time
Pre - emphasis 2
c
constant
Waiting
Transient
ttack tlme
� h . aracter-
Recovery time
1st1cs
Hold time
Frequency characteristics
(when recording)
Linearity
[Frequency characteristics (when recording)]
(Hz)
Frequency
Response
(dB)
characteristics
Standards
±
C H 1 : 1 .50
0.02 MHz
CH2: 1 .70 ± 0.02 M Hz
±
CH1 :
1 00 kHz, CH2:
CH1 : - 1 3.0 ± 2.0 dB
±
CH2: - 1 5.0
2.0 d B
Refer to (Noise reduction standards].
±
C H 1 : 1 .50
0. 1 5 MHz
±
CH2: 1 .70
0. 1 0 M Hz
±
CH 1 :
60 kHz, CH2:
Fixed
2
75µsec, 1 9µsec
75 µsec, 27 µsec
}
75µsec, 27 µsec
3 msec
40 msec
1 5 msec
Refer to [Frequency characteristics
Refer to [Noise reduction
50
1 00
200
0
0
0
Of the above four types, FM Audio (monaural) is the only
one which is indispensable, while FM (stereo) , PCM and
AUX are optional.
This unit uses FM Audio (stereo). Playback is also
compatible with monaural tape recordings.
±
50 kHz
Set chroma signal recording current at O dB
Band width including 99% of the entire spectrum
component (power factor)
±
30 kHz
Modulation frequency 400 Hz
Standards
Tolerance 20%
1/0
(when recording)].
characteristics].
400
700
1 k
0
+0. 1
+0.3
- 4-28 -
Remarks
Remarks
2. 1 2 kHz, 8.38 kHz
2. 1 2 kHz, 5.89 kHz
2. 1 2 kHz, 5.89 kHz
Standard input level
2k
7k
4k
+1 .2
+2.7
+4. 1
1 0k
1 4k
+4. 8
+5.3
±
Tolerance
1 .5 dB
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