Meridian Audio Digital Surround Controller G61 用户手册

The Ambisonics DSP preset can decode  UHJ format, the two-

channel stereo-compatible encoding found on Ambisonically-

recorded discs and broadcasts. This material is specifically encoded 

for surround reproduction and can give breathtakingly realistic 

sound when replayed using the digital surround controller.

Ambisonics surround sound is quite unlike conventional stereo. A 

special microphone technique picks up the sound of the original 

performance in all three dimensions, allowing an archive to be 

made which describes the soundfield exactly at that position. The 

microphone signals are then encoded using a phase-amplitude 

matrix to allow the effect to be conveyed on two-channel carriers 

(like FM radio, LP, or CD).

The digital surround controller uses accurately matched, frequency-

dependent, phase-amplitude matrices to decode the signal and 

construct the signals for each speaker feed.

The fundamental difference between Ambisonics surround sound 

and conventional stereo is that the signals from all the speakers 

combine to produce a coherent soundfield at the listening position, 

giving the illusion that you are sitting inside the recording space 

whether you are at the exact central seat or well off to one side.

Of all the signal-processing options, Ambisonics is the one that 

requires the greatest attention to speaker choice and positioning.

Super synthesises a signal from a conventional stereo recording 

or broadcast so that it can be decoded using the Ambisonic 

decoder. The result is especially effective for two particular types of 

recordings:

• Those using true coincident microphone techniques.

• Multi-tracked or multi-miked recordings.

 Width*

0 to 1

The width of the image.

 Row†

A, C, E, G, I, K, M

The seating position; the letters are like rows in a hall.

 Channels

7, 6, 5, 4

The number of speakers.

 R Filter

Off, 3kHz, 7kHz, 9kHz 

The cutoff of high frequencies from the rear surrounds.

 S Filter

Off, 3kHz, 7kHz, 9kHz

The cutoff of high frequencies from the side surrounds.

*Super only.

†Ambisonics only.

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