ShengLiPu Co., Ltd.

技术文摘 Technology Digest

About professional audio terms

212015/6
2015-6-21

1. The sound pressure level

Benchmark refers to the actual sound pressure and sound pressure ratio of 20 times the number, the unit is db. It is a measure of the sound system of sound, the acoustic amplification places important measure of quality.

2.Amplification power

amplification power refers to achieve rated expansion sound pressure level of the system design, amplification equipment needed for the rated power. the unit is watts. It is direct embodiment of acoustic index on the acoustic parameters, the final cost and it will be related to the project, it is particularly important.

3. Hum

50 HZ mains hum, because for low frequency sound and hum the name, audio equipment of power supply ripple coefficient is too large and poor anti-jamming performance, can lead to hum.

4.Pure-tone

It is a sine wave with single frequency, and the voice of the general is composed of several frequency wave. Like the sound of a tuning fork is pure tone.

5. Intermodulation distortion (IMD)

Intermodulation distortion refers to two amplitude according to certain proportion (usually 4:1) hybrid single audio signal by replay after the equipment to produce a new frequency components of a signal distortion.

6. Frequency divider

The design of speakers is equipped with a circuit unit,take the input music signal separation into different parts, such as soprano, alto, bass, and then sent to the corresponding respectively high, medium and woofer in the replay.

7.Double amplifier partials

Speakers of every speaker unit driven by an independent amplifier channel for a connection way. A pair of two frequency of the need to use two stereo power amplifier and two pairs of horn line.

8. Double partials

It is a connection mode that use two sets of horn line respectively transmitting music signal the and the bass part.Need to use double partials has two terminals of the special design of the speakers.

9. Amplifier

Pre-amplifier and power amplifier are collectively called the amplifier.

10.Power amplifier

It is an electronic device that used to enhance the signal power to drive the speakers sound The power amplifier that without auxiliary functions such as signal source selection, volume control is called after class.