Frequency

频率/Pin2 Lv4

n/a

CHEARS: True

EARS: True

CMT: False

EARS2 Encyclopedia: True

**CHEARS:**

与幅度一样，频率通常也用对数尺度衡量，以此强调不同频率间的比例，这通常比使用频率之间的差值能更好的描述频率之间的关系。两个乐音之间的频率决定了两者之间的音程关系。

最常用的对数音高尺度是 “MIDI音高”，它用音高69表示每秒钟振荡440个周期的频率－即中央C上方的那个A。为了将一个MIDI音高m转换成表示每秒钟周期数的频率f，可以使用音高／频率转换公式：

根据上式，中央C对应的MIDI音高为m＝60，其频率为f＝261.626个周期每秒。

Frequencies, like amplitudes, are often measured on a logarithmic scale, in order to emphasize proportions between them, which usually provide a better description of the relationship between frequencies than do differences between them. The frequency ratio between two musical tones determines the musical interval between them.

The most commonly used logarithmic pitch scale is "MIDI pitch", in which the pitch 69 is assigned to a frequency of 440 cycles per second - the A above middle C. To convert between a MIDI pitch m and a frequency in cycles per second f, apply the Pitch/Frequency Conversion formulas:

Middle C, corresponding to MIDI pitch m=60, comes to f=261.626 cycles per second.

(Source: Miller Puckette, The Theory and Technique of Electronic Music. World Scientific Publishing Co. Pte. Ltd. 2007)

**EARS:**

The rate of repetition of the cycles of a periodic quantity, such as a sound wave. Thus, frequency is the inverse of the period. More generally, frequency can be thought of as the rate of change of phase. Frequency is denoted by the symbol f, and is measured in hertz (Hz) - formerly called cycles per second (cps or c/s) - kilohertz (kHz), or megahertz (mHz). The only sound which consists of a single frequency is the pure sine tone. All other sounds are complex, consisting of a number of frequencies of greater or lesser intensity. The frequency content of a sound is its spectrum. The subjective sense of frequency is called pitch. That is, frequency is an acoustic variable, whereas pitch is a psychoacoustic one. (Source: Barry Truax - Handbook for Acoustic Ecology CD-ROM Edition. Cambridge Street Publishing, 1999 - CSR-CDR 9901)

**EARS 2:**

A technical term that describes Pitch. The higher the frequency of a sound the higher it sounds in pitch.

Frequency is measured in Hertz (Hz). The number of wave cycles per second.

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