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June 29th, 2009, 06:25 PM | #16 | |
Trustee
Join Date: Dec 2004
Location: Lipa City Batangas, Philippines
Posts: 1,110
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Quote:
Richard |
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June 30th, 2009, 12:49 AM | #17 |
Inner Circle
Join Date: Mar 2003
Location: Billericay, England UK
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July 5th, 2009, 12:08 AM | #18 |
New Boot
Join Date: Feb 2008
Location: Dallas, TX
Posts: 15
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just to clarify, what is negative gain?
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July 5th, 2009, 02:24 AM | #19 |
Trustee
Join Date: Dec 2004
Location: Lipa City Batangas, Philippines
Posts: 1,110
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Hi Josh. Gain is used to boost the analogue sensor signal before the A-D conversion stage. Gain values of +3dB, +6dB, +12dB are common on many video cameras. Without any boost the gain is 0dB. If the signal is cut instead of boosted, that is negative gain, for example -3dB. To give you a feel for the numbers, if the signal is cut by half, which is like losing one stop of light, the gain would be -6dB.
Richard |
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