Laser pickups AC servo system

Laser pick-up servo system guarantees the stability of laser pickup device accurate tracking of automatic control systems, auto-focus and auto tracking two, namely the Elimination of axis (vertical direction) error and radial (horizontal direction) error, so that the laser pickup in record rotation continuously adjusted posture, alignment on compact discs, guarantee of light rail pickup. Non-title Jane speakers means the geometric asymmetry of the trumpet, General circular, rectangular section of the trumpet is symmetrical, rather than on the title of the tube is the sound field model tube, such as the rectangular Hall, this kind of trumpet managed range is rectangular, can reduce the interface a reflection of the impact sound as much as possible to override the listening area, you can make the distance between the speaker distances and various listening to the sound level phase. Means the sound field model tube, such as the rectangular Hall, this kind of trumpet managed range is rectangular, can reduce the interface a reflection of the impact sound as much as possible to override the listening area, you can make the distance between the speaker distances and various listening to the sound level phase. Decentralized acoustic speaker is located in the rooms around, apply to larger Office. Advantages: (1) sound field with uniform. (2) under the impact of acoustic environment. Are: (1) audio-visual inconsistencies. (2) the speaker distance more than 17 metres among will have false echo phenomenon. (3) the relative placement of speakers between audio interference. The first two deficiencies can be used to add delay after zone speaker solution. Crossover points means the divider-pass, band-pass and low pass filters the demarcation point between the frequency, measured in Hertz. The two crossover bass sound only a crossover point, high, medium and low frequency sound box has two crossover points, fractional frequency should be based on the frequency bands speaker unit or speaker frequency characteristics and power allocation to specific determination. Nonlinear distortion also called waveform distortion, nonlinear distortion, performance for audio system output signal and the input signal is not a linear relationship, by electronic element with linear characteristic curve, so that the resulting output signals in the new harmonic constituents, changed the original signal spectrum, including harmonic distortion, transient intermodulation distortion, intermodulation distortion, nonlinear distortion sound, not only will damage due to excessive amounts of potentially high frequency harmonics and the DC component burning sound treble speakers and subwoofer speakers.