Audio; Pixel-Orbiting Function (Option) - Philips 227E3QSU/93 Service Manual

Meridian 3
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3.15 Audio

3.15.1 Frequency Response
The amplifier and speaker combination shall provide a frequency response of 300Hz to 20 KHz, with
+/-3db variation over the entire response range.
3.15.2 Total Harmonic Distortion
Total harmonic distortion shall be limited to 5% THD at the maximum wattage speaker rating specified
in section 1.3 at 1 KHz, when the input is 1.0Vrms.
3.15.3 Power Handling
Each speaker transducer shall accept up to the specified wattage of audio power without damage or
exceeding the frequency response and total harmonic distortion specifications.
3.15.4 Audio Amplifier
The amplifier shall provide two channels of audio up to 1.5 Watts per channel from 100Hz to 20 KHz,
based upon an audio signal input of 1.0Vrms per channel.
3.15.5 Volume Control
For monitors with a manual volume control, the direction (at the bottom) of the bezel volume control is
"-" key for minimum volume and "+" key for maximum volume. The default shipping position of the
volume control shall be approximately 90%.
3.15.6 Speaker Sensitivity
The speakers shall support a minimum sensitivity of 75dB+/-3dB at 2W/1m at 1 KHz.
3.15.7 Maximum Audio Card Output
The monitor audio amplifier shall accept a maximum input voltage of 1.5Vrms and meet the following
requirements at the maximum monitor volume setting.
1. The ratings of the audio amplifier may not be exceeded.
2. The ratings of the speakers may not be exceeded.
3. There must not be any clipping of the audio amplifier output signal.
Voltage dividers may be used to reduce the input signal level.
3.15.8 Monitor Audio Amplifier Input Impedance
The monitor audio amplifier shall have minimum 10KOHM AC input impedance.
3.16 Pixel-orbiting function
3.16.1 On wide view angle models (IPS/e-IPS/AMVA/PVA/MVA)
3.16.2 Functional description
Every 1 min to shift one pixel for whole picture, 8 min to original point and Routing path (H-1, V+1,
H+1, V-1, V-1, H+1, V+1, H-1)