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信噪比.
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信噪比(英語:Signal-to-noise ratio,缩写为SNR或S/N),又稱訊雜比[1]或訊噪比,是科学和工程中所用的一种度量,用於比較所需訊號的强度與背景雜訊的强度。其定義為訊號功率与雜訊功率的比率,以分貝(dB)为单位表示。大於比率1:1(高於0分貝)表示訊號多於雜訊。信噪比通常用於描述電子訊號,也可以應用在各種形式的訊號,比如冰芯內的同位素量,或細胞間的生物化學信號[來源請求]
所指為有用信号功率(Power of Signal)与雜訊功率(Power of Noise)的比。因此為振幅(Amplitude)平方的比:
它的单位一般使用分贝,其值为十倍对数信号与噪声功率比:
其中
- 为信号功率(Power of Signal)。
- 为噪声功率(Power of Noise)。
- 为信号振幅(Amplitude of Signal)。
- 为噪声振幅(Amplitude of Noise)。
信道信噪比为
其中 W 是带宽, 是调制系数
(AM接收机的)输出信噪比为
信道信噪比为
输出信噪比为
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| 一般 |
- 声学消音
- 失真
- 主动降噪
- 噪声控制
- 噪声测量
- 噪声功率
- 噪声降低
- 噪声温度
- 相位失真
|
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| 接触 | |
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| 噪声类别 | |
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| 工程术语 |
- 通道噪声电平
- 电路噪声电平
- 等效输入噪声温度
- 等效抗噪声
- 等效脉冲编码调制噪声
- 脉冲噪声 (音频)
- 噪声系数
- 底噪
- 噪声整形
- 噪声谱密度
- 噪音、振動與音振粗糙度(NVH)
- 相位噪声
- 伪随机噪声
- 统计噪声
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| 比例 |
- 搬送波對噪音比(C/N)
- Carrier-to-receiver noise density(C/kT)
- 分貝
- Eb/N0(每比特能量对噪声密度)
- Es/N0(每符号能量对噪声密度)
- 調製誤差率(MER)
- 訊號雜訊比和失真比(SINAD)
- 信號與干擾比(S/I)
- 信噪比 (S/N, SNR)
- 信雜比 (磁振造影)
- 信號與干擾加噪音比(SNIR)
- 信號-量化雜訊比
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| 相关主题 | |
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- ^ 劉博文. 電子學(下). 臺北縣五股鄉: 全威. 2007. ISBN 978-986-6964-20-6 (中文(臺灣)).
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