“decibel”的概念、定义、翻译、参考文献-科学参考

decibel

Physics

A unit used to compare two power levels, usually applied to sound or electrical signals. Although the decibel is one tenth of a bel, it is the decibel, not the bel, that is invariably used. Two power levels P and P₀ differ by n decibels when n=10log₁₀P/P₀. If P is the level of sound intensity to be measured, P₀ is a reference level, usually the intensity of a note of the same frequency at the threshold of audibility.

The logarithmic scale is convenient as human audibility has a range of 1 (just audible) to 10¹² (just causing pain) and one decibel, representing an increase of some 26%, is about the smallest change the ear can detect.

Internet

A value that is normally used to measure the loudness of an acoustic signal. It is also used to measure electrical signals.

Biology

A unit used to compare two power levels, usually applied to sound or electrical signals. Although the decibel is one tenth of a bel, it is the decibel, not the bel, that is invariably used. Two power levels P and P₀ differ by n decibels when n = 10log₁₀P/P₀. If P is the level of sound intensity to be measured, P₀ is a reference level, usually the intensity of a note of the same frequency at the threshold of audibility.
The logarithmic scale is convenient as human audibility has a range of 1 (just audible) to 10¹² (just causing pain) and one decibel, representing an increase of some 26%, is about the smallest change the ear can detect.

Geology and Earth Sciences

One-tenth of a bel (named after Alexander Graham Bell) and the unit in which two power levels are compared. It is used most commonly in acoustics and in describing electrical signals. The decibel difference (N) between the largest (A_max) and smallest (A_min) measurable amplitudes is given by N = 20log₁₀(A_max/A_min). The ratio of values for two power levels, P₁ and P₂, is given by N = 10log₁₀(P₁/P₂).

单词	decibel
释义	decibel Physics A unit used to compare two power levels, usually applied to sound or electrical signals. Although the decibel is one tenth of a bel, it is the decibel, not the bel, that is invariably used. Two power levels P and P₀ differ by n decibels when n=10log₁₀P/P₀. If P is the level of sound intensity to be measured, P₀ is a reference level, usually the intensity of a note of the same frequency at the threshold of audibility. The logarithmic scale is convenient as human audibility has a range of 1 (just audible) to 10¹² (just causing pain) and one decibel, representing an increase of some 26%, is about the smallest change the ear can detect. Internet A value that is normally used to measure the loudness of an acoustic signal. It is also used to measure electrical signals. Biology A unit used to compare two power levels, usually applied to sound or electrical signals. Although the decibel is one tenth of a bel, it is the decibel, not the bel, that is invariably used. Two power levels P and P₀ differ by n decibels when n = 10log₁₀P/P₀. If P is the level of sound intensity to be measured, P₀ is a reference level, usually the intensity of a note of the same frequency at the threshold of audibility. The logarithmic scale is convenient as human audibility has a range of 1 (just audible) to 10¹² (just causing pain) and one decibel, representing an increase of some 26%, is about the smallest change the ear can detect. Geology and Earth Sciences One-tenth of a bel (named after Alexander Graham Bell) and the unit in which two power levels are compared. It is used most commonly in acoustics and in describing electrical signals. The decibel difference (N) between the largest (A_max) and smallest (A_min) measurable amplitudes is given by N = 20log₁₀(A_max/A_min). The ratio of values for two power levels, P₁ and P₂, is given by N = 10log₁₀(P₁/P₂).
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