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miroMEDIA Surround - Specifications |
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Contents |
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Features |
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Technical data |
System | ISA board (8-bit), Plug and Play |
Chip | Texas Instruments TMS57052 24-bit data bus and 15 ns data memory |
Audio inputs | 1 x 3.5 mm jack plug |
Audio outputs | 2 x 3.5 mm jack plugs 3 x phono jacks (Cinch) internal, Sound Blaster compatible cable |
Signal-to-noise ratio | 0.707 Vrms = 84 dB |
THD (left, right) | <0.02 & @ 100 mVrms |
Frequency response | (-3 dB) 20 Hz to 20 kHz |
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System requirements |
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The working of Dolby Pro Logic Surround |
In film productions the Surround sound is created by professional technicians and is packed (encoded) to the stereo tracks on recording. Dolby Pro Logic decodes and distributes it to four channels (front left, front right, center, Surround) on playback. Each channel hast its own task assigned. The center channel is important mainly for dialogs and solo voices. The Surround channel is played back through two speakers placed in the rear left and right which should point diffuse into the room.
The scetches show the positions and tasks of the speakers. Beside the often used solution with five speakers the miroMEDIA Surround is also designed for the easy to realize Phantom mode. With this mode two pairs of powered speakers can be connected directly to the Surround board and the center channel is emulated by the front speakers. With the 3D-Phonic mode the whole Surround sound is simulated with only two speakers (front left and right).
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The left and right speakers create the stereo sound from the left over the middle to the right. |
The center speaker mounts events and speach to the screen, the place of action. |
The rear speakers let the sound move from the front to the rear and back. |
Source: miroMEDIA Surround cardboard box
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