Sound professional terms

Author:　News Source:　Click：　Update Time：2007-09-07

FM (frequency modulation) FM

 

Of a radio type, it will encode the audio waveform as a deterioration of access to the carrier signal frequency. A center frequency of 88.1MHz, FM radio wave amplitude according to the audio transmission a frequency range from tiny to slightly more than 88.1MHz in the 88.1MHz signal.

Frequency Frequency

Changes in the rate of vibration or oscillation. Sound is vibration in the air spread of electrical signals through a different rate of change to show: the voice of the bass tone through the slow changes in voltage to display, and the high pitch by the fast-changing displays. Frequency of number of cycles per second or Hz to measure. The audio spectrum can often think middle class from 20 to 20,000 Hz. In radio technology, radio frequency means a carrier signal, such as the FM radio to 88.1MHz or AM radio to 1,010 KHz.

Frequency response Frequency response

Shows how the smooth component of the technical indicators generated audio signal. A typical value is 20 to 20,000 Hz ± 3dB, said the device can produce as low as 20Hz up to 20,000 Hz range of voices, but the degree of change in a loud voice no more than plus or minus 3dB. If the indicator does not include a frequency response error of (plus or minus db values), in fact, it is meaningless.

Graphic equalizer Graphic Equalizer

Have a fixed-band equalizer.

Ground Ground

Theoretical zero potential reference point used to describe the negative connection.

Headroom clearance, free-space

Expressed in decibels, is the most low-level input signal and audio device can not be cited to the normal processing of the maximum distortion level differences.

Heads Heads

Tape deck and a component. When recording, it produces magnetic tape; playback, it has been detected on the tape's magnetic field. Most of the tape deck and has a separate wiping sound heads, magnetic tape by making random sounds of the wipe, which can be re-recording.

High-pass filter high-energy filter

A divider circuit that allows only higher than the expected frequency of the signal through the crossover point, while the frequency of the signal attenuation below the crossover point.

Home theater system home theater system

Audio and video components of a large gathering. To achieve true surround sound movie sound effects unified tone, at least four speakers (two front, two in the rear). Top level of the system and another one Dolby Pro Logic decoder, in fact for the home theater system to increase the central channel of the former speakers and subwoofer.

HX Pro

Refers to the professional Dolby Dolby HX Pro headroom extension.

Hz (hertz) Hz

Frequency standard unit, named after the German physicist Heinrich Hertz. Hertz said the number of cycles per second, or second start from a basic state changes as well as to restore the number of cycles. In the audio range, the basic state is no sound when the air pressure or its electrical equivalent value (often-level DC signal). Hertz value of the greater, indicating the higher pitch.

IC (integrated circuit) IC

Contains many transistors and resistors of a small electronic device, it is the most essential part of the audio component.

IF (intermediate frequency) rejection IF Rejection

In the intermediate frequency is used to measure the AM or FM tuner the ability to suppress external interference, the larger the number the better.

Contains many transistors and resistors of a small electronic device, it is the most essential part of the audio component.