[問題] 監視主機在用的集音器哪一款比較好呢?
想請問
目前有在拍賣網站上查詢一些集音器(也有人說叫拾音器,收音器)的產品
是想要接在監視器主機DVR上面
價位有五六十元到五六百元的
控制晶片也有飛利浦,TI,AD,Panasonic的
不知道目前哪一家的控制晶片,在錄音品質上會比較好呢?
例如目前查到這兩種
Analog Devices的AD797晶片跟美國德州儀器Texas Instruments的NE5532晶片
可是看不太懂..所以想請問哪種產品的錄音品質會比較好呢?
謝謝
以下是AD797的內容:
(取自http://www.analog.com/media/en/technical-documentation/data-sheets/AD797.pdf)
FEATURES
Low noise
0.9 nV/√Hz typical (1.2 nV/√Hz maximum) input voltage
noise at 1 kHz
50 nV p-p input voltage noise, 0.1 Hz to 10 Hz
Low distortion
?120 dB total harmonic distortion at 20 kHz
Excellent ac characteristics
800 ns settling time to 16 bits (10 V step)
110 MHz gain bandwidth (G = 1000)
8 MHz bandwidth (G = 10)
280 kHz full power bandwidth at 20 V p-p
20 V/μs slew rate
Excellent dc precision
80 μV maximum input offset voltage
1.0 μV/°C VOS drift
Specified for ±5 V and ±15 V power supplies
High output drive current of 50 mA
圖片網址:
http://img.ruten.com.tw/s1/3/bc/6d/21445656263789_441.jpg
以下是NE5532的內容:
(取自http://www.ti.com/lit/ds/symlink/ne5532.pdf)
Features
Equivalent Input Noise Voltage:
5 nV/√Hz Typ at 1 kHz
Unity-Gain Bandwidth: 10 MHz Typ
Common-Mode Rejection Ratio: 100 dB Typ
High DC Voltage Gain: 100 V/mV Typ
Peak-to-Peak Output Voltage Swing 26 V Typ With VCC± = ±15 V and RL = 600 ?
High Slew Rate: 9 V/μs Typ
圖片網址:
http://img.ruten.com.tw/s1/8/7f/11/21301076395793_100.jpg
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