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參數(shù)資料
| 型號： | MC44C402EVK |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT EVAL MC44C402 MTS ENCODER |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 音頻，音頻處理 |
| 已用 IC / 零件： | MC44C402 |
| 相關(guān)產(chǎn)品： | MC44C402ACR2-ND - IC STEREO ENCODER MTS 32-LQFP MC44C402AC-ND - IC STEREO ENCODER MTS 32-LQFP |
8
Freescale Semiconductor
MC44C402
SETTING LEVEL FOR MODULATOR/ENCODER
INTERFACE
1.
Verify calibration of the equipment. This requires a
modulator and precision signal source. The audio signal
cannot be passed through the stereo encoder for this
setup. Suggest using 10396.48 Hz audio test signal
directly into first Bessel null on a spectrum analyzer.
The null will occur at precisely 25 KHz deviation of the
10396.48 Hz audio test signal. Please see Figure 8 for
test equipment setup.
2.
Input 1800 Hz @ 0.4 V p-p into left channel and set
adjust attenuation between stereo encoder and the
modulator for optimum separation using calibrated
demodulator and decoder.
Figure 8. MC44C402 Level Setup
Audio Generator
Precision
Demoodulator
TEK 1450-1
Precision MTS Decoder
Modulation Sciences SRD1
Audio Spectrum
Analyzer
Modulator
No Audio Pre-emphasis
Stereo Encoder
Spectrum Analyzer
Audio Analyzer
Audio Precision SYS2
Wide Band
Output
Composite Video
Left In
Right In
Adjust for optimal
separation with
only Left channel
driven 1800Hz
44C402 Level Setup
Input Left Channel only
1800Hz 400 mV p-p
CVBS in
4.5MHz
Notch Filter
0db / 25KHz deviation =
1.45Vp-p @ 1KHz Mono
(both channels driven)
Demodulator / MTS Decoder Calibration
25KHz deviation Check = 1 0396 Hz
@25KHz deviation gives bessel nul l and
Ref Level on SRD-1
Composite Video
Attenuator
1) Calibrate MTS Decoder to Demodulator connection using Bess el Null Technique
2) input 1.8KHz 0.4 V p-p on left channel only and optimiz e stereo separation with
attenuator.
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| MC44C404 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Stereo Encoder |
| MC44C404_08 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:NICAM 728 - Stereo Encoder |
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| MC44C404EPR2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:NICAM 728 - Stereo Encoder |
| MC44C404EVK | 制造商:Freescale Semiconductor 功能描述:NICAM EVAL KIT - Boxed Product (Development Kits) |
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