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參數(shù)資料
| 型號： | MGM3000X |
| 廠商： | SIEMENS A G |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Video Modulator for FM/AM-Audio |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| 文件頁數(shù)： | 16/23頁 |
| 文件大?。?/td> | 1016K |
| 代理商： | MGM3000X |
Semiconductor Group
16
MGM 3000X
Test Circuit 4
Description of the Measurement Configuration to Measure the Audio and/or Noise
in Video during FM- and AM-Modulation of the Audio Carrier
Calibration:
AF-signals are switched off, video signal is present at video input, modulation measure-
ment device set at AM is adjusted to video carrier; filter: 300 Hz … 20 kHz; detector:
(P + P)/2; Wave analyzer at video signal level (16 kHz) adjusted and resultant level as
reference
a
V
defined.
1. Measurement of audio interference product ratio in video while the audio carrier FM modulated:
AF-signal is connected to FM-audio input; video signal is present at video input;
Modulation measurement device set at AM; filter: 300 Hz … 20 kHz; detector: (P + P)/2; the
automatic RF-level position of the measurement device is switched off; wave analyzer at video
signal level 1 kHz or 2 kHz or 3 kHz adjusted and resultant level is set to
a
A
. The audio noise ratio
in video results from
a
A/V
=
a
A
–
a
V
(dB).
2. Measurement of signal-to-noise ratio in video without FM-modulation of audio carrier: AF-signals
are switched off; video signal is switched on; modulation measurement device set at AM;
filter: 300 Hz … 3 kHz; detector; RMS
× √
2; Wave analyzer at video signal level (16 kHz) detuned;
read out in dB to reference level of calibration is
a
N/V
;
3. The noise limit of the measurement device is approx. 85 dB.
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