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miroMEDIA Surround - Specifications

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Contents

 

Features

[miroMEDIA Surround board]
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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).

Left/Right Center Surround

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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© Oliver Gantz / o.gantz@tu-bs.de / 1999-04-19