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          Audio terms

          FM (frequency modulaTIon) frequency modulation

          A type of wireless broadcasting that encodes the audio waveform as a variation into the frequency of the carrier signal. An FM radio station with a center frequency of 88.1MHz will propagate a signal with a frequency range from slightly smaller than 88.1MHz to slightly larger than 88.1MHz according to the amplitude of the audio wave.

          Frequency

          The rate of change of vibration or oscillation. Sound is the propagation of vibration in the air, which can be displayed by electrical signals with different rates of change: low-pitched sounds are displayed by slowly changing voltages, while high-pitched sounds are displayed by rapidly changing ones. Frequency is measured in cycles per second or Hz. The audio spectrum can often be considered to produce 20 to 20,000 Hz. In radio technology, frequency refers to the carrier signal of the station, such as FM station is 88.1MHz or AM station is 1,010KHz.

          Frequency response

          A technical indicator that shows how a component produces audio signals smoothly. The typical value is 20 to 20,000Hz ?± 3dB, which means that the component can produce sounds ranging from 20Hz to as high as 20,000Hz, but the change in the loudness of the sound will not exceed 3dB. If a frequency response index does not include the error (positive and negative decibel value), it is actually meaningless.

          Graphic equalizer

          Equalizer with fixed band.

          Ground

          The theoretical zero potential reference point is used to describe the negative connection.

          Headroom, free space

          Expressed in decibels, it refers to the difference between the minimum level of the input signal and the maximum level that the audio device can handle normally without causing distortion.

          Heads

          A component of a tape deck. When recording, it generates a magnetic field on the tape; when playing, it detects the existing magnetic field on the tape. Most tape cassettes have independent erase heads, which can erase the sound by randomizing the magnetic field on the tape, so that it can be re-recorded.

          High-pass filter

          A frequency dividing circuit allows only frequency signals above a predetermined frequency division point to pass, while attenuating frequency signals below the frequency division point.
          Home theater system

          A large gathering of audio and video components. To achieve a true surround sound movie sound adjustment effect, at least 4 speakers (two in front and two in back) are required. The top-level system also has a Dolby professional logic decoder, which actually adds a front center channel speaker and subwoofer to the home theater system.

          HX Pro

          Refers to Dolby HX Pro Dolby Professional Headroom Extension.

          Hz (hertz)

          The standard unit of frequency is named after the German physicist Heinrich Hertz. Hertz is the number of cycles per second or the number of cycles of change from a basic state to recovery. In the audio range, the basic state refers to the air pressure when there is no sound or its electrical equivalent (constant-level DC signal). The greater the Hertz value, the higher the pitch.

          IC (integrated circuit) integrated circuit

          A small electronic device containing many transistors and resistors, it is a basic part of most audio components.

          IF (intermediate frequency) rejecTIon intermediate frequency suppression

          Used to measure the ability of AM or FM tuners to suppress external interference at the intermediate frequency. The larger the number, the better.

          A small electronic device containing many transistors and resistors, it is a basic part of most audio components.

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