The pitch is high or low, D key: the main note is D, called D key; C key: the main note is C, called C key; A key: the main note is A, called A key; B key: the main note is B, It’s called the key of B; the key of E: The main note is E, so it’s called the key of E. The frequency of sound is called pitch, which is one of the three main subjective attributes of sound, namely volume (loudness), pitch, and timbre (also called timbre).

The level of sound is called pitch, and the frequency determines the pitch. The faster an object vibrates, the higher the pitch of the sound it makes. The slower the vibration, the lower the pitch of the sound.

The pitch is also related to the structure of the sound emitter, because the structure of the sound emitter affects the frequency of the sound. In general, the pitch of low-frequency pure tones below 2000 Hz decreases with increasing loudness, and the pitch of high-frequency pure tones above 3000 Hz increases with increasing loudness.

Quantitative judgments can be made on pitch. The unit of pitch is called mel (mel): the pitch of a pure tone with a frequency of 1000 Hz and a sound pressure level of 40 decibels is used as the standard, which is called 1000 mel. Other pure tones that sound twice as high in tone are called 2000 mel. The value twice as low is called 500 US, and so on, establishing a pitch scale across the entire audible frequency range.

Extended information:

Introduction to tone control

1. A good tone control circuit must have sufficient high and low adjustment range, but it also requires During the entire adjustment process of treble and bass from the strongest to the weakest, the midrange signal (usually 1000 Hz) does not change significantly in amplitude to ensure that the volume remains roughly unchanged.

2. Boosting or attenuating high and low sounds is relative to the midrange. First make the midrange a fixed attenuation (or deepen the negative feedback) and then make the treble or bass attenuate less (or make the negative feedback lighter), even if it is improved. Therefore, in order to compensate for the gain loss of the tone control circuit, it is often necessary to add one or two stages of amplification circuits.

Tonality

1. Basically, Western music is based on the heptatonic scale. You can understand it from the staff. The notes are arranged in the order of the lines and spaces. There are only seven different note names: C, D, E, F, G, A, and B. Taking the key of C major as an example, in the arrangement of C, D, E, F, G, A, B, C*, except for the semitone intervals between E, F and B, C*, the intervals between the other notes are Whole tone.

2. 1 2 3 4 5 6 7 arranged according to the twelve equal laws. That is, major second, major second, minor second, major second, major second, minor second. Example of the relationship: C key C D E F G A B C D key D E #F G A B #C D

3. Tonality is the comprehensiveness of the key. meaning. Includes tonic height and mode categories. In some cases, key also has the meaning of tonic height.

Baidu Encyclopedia - Tone

Baidu Encyclopedia - Tonality