Automotive Audio System Service area


The range that the practical radio waves reach from the broadcast station.
Weak electric field
A radio wave weakens as it becomes far, like light. For this reason, the radio wave in an area far away from the antenna of the broadcast is weak and is not received in good quality. An area like this where the radio wave is weak is called a weak electric field area.
Dynamic range
The range between the loudest sound and the softest sound. The ability to actually play from the ff (fortissimo) to the pp (pianissimo). As the S/N ratio becomes larger, the dynamic range becomes wide. The loud sound depends on the power of the amplifier and the soft sound depends on how small the residual noise is.
Each signal system. For example, in the stereo sound such as the stereo broadcast, the signal is separated into right and left signals.
This is the national industry standard established by Deutche Industrie Normen, and this standardizes everything from the basic planning to the most advanced technique in the wide range of industry. In the car audio, the installation space is standardized and 1 DIN means that the outside dimension is 178 mm wide and 50 mm high and something that is 100 mm high is called 2 DIN.
This is an abbreviation of Digital Signal Processor. According to the digital audio technique, this device reproduces the acoustic field mechanism at the live concert hall and its realistic sensation (as if the place was like the concert hall, that is, similar to a live acoustic field).
Tape hiss
The noise produced by the tape itself in all ranges of the audible frequency. It occurs particularly in the high frequency range noise. Hissing sound.
Tape squeaking
This is a phenomenon in which a squeaking sound is produced mixed with strange sound while the cassette tape is played.
This phenomenon occurs because the tape does not run smoothly on the head and is wound with the tape vibrating.
The cause of this bad tape winding is dirt on the head or tape guide, or moisture on the tape itself.
Dolby NR (Dolby Noise Reduction)
Dolby (Double D marks) refers to an acoustic system developed by Dolby Laboratories of England. Dolby is a method to reduce tape hiss. This method increases the recording level of the middle and high range frequencies that are easily deafened by the characteristic of the tape beforehand while recording. Then the weakened sound is played to reduce the characteristic noise of the tape during playback.
A sound component, that is not in the original signal but appears in the signal amplified by the amplifier. When the distortion component is great, the sound quality becomes worse.
Distortion factor
This value indicates how much the input waveform distorts during playback.
This value is expressed in % and the smaller value, the less the distortion.
Fader adjustment
The device that adjustment the sound balance between the front speaker and rear speaker.
When the sound is low, it is difficult for the human to hear low-range and high-range sounds, and the sounds peel uncomfortable. Loudness is a function to control this audibility correction. It intensifies the low-range and high-range sound to allow enjoyment of impressive music when the sound is low.
Leader tape
This is a special strong tape that connects the beginning and end of winding.
Generally, white tape is used. The original purpose is to prevent the head touch from becoming worse by a wrinkle on the tape. On this area, recording cannot be done and most use the cleaning tape. On this tape, the side mark that indicates side A or side B, an arrow mark that indicates the direction, and a cueing line that indicates the possibility of recording in seconds are printed.
Logic control
The action of quick and correct control of all the functions by controlling the microcomputer only slightly touching the operation button. The operation is performed by the solenoid and motor. For example, in the case of tape player, when the tape is in the slot, lightly inserted the tape is set and playback starts.
Wow flutter
The fluctuation of the played signal caused by the change of speed. Wow means the fluctuation in the comparatively low frequency of less than 3Hz and flutter means the irregularity of the rotation of higher than 3 Hz. In the tape player, wow flutter occurs; however, in the CD player it seldom does.

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