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參數(shù)資料
| 型號(hào)： | TDA5666-5 |
| 廠商： | SIEMENS A G |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Video Modulator for FM-Audio |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP18 |
| 文件頁數(shù)： | 14/22頁 |
| 文件大小： | 1020K |
| 代理商： | TDA5666-5 |
Semiconductor Group
14
TDA 5666-5
Test Circuit 4
Description of the Measurement Configuration to Measure the Audio and/or Noise
in Video during FM-modulation of the Audio Carrier
Calibration:
AF-signals are switched off, video signal is present at video input, modulation
measurement 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 x
; 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.
2
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