Meridian 861 User's Guide download pdf (Page 33)

DSP Presets

Ambisonic surround sound is quite unlike conventional

stereo. A special microphone can be used to capture

the sound of the original performance in all three

dimensions, allowing a recording to be made in a

special format (B-Format) that describes the soundfield

exactly at the microphone position. Alternatively,

special mixing techniques including Ambisonic spatial

localisation controls (panpots) can be used to mix

conventional multitrack into the same Ambisonic

surround format. The channels of this recording can

then be encoded using a phase-amplitude matrix (UHJ)

to allow the surround information to be conveyed,

typically via a two-channel medium such as disc or FM

broadcast. On playback, the decoder reconstructs the

soundfield captured by the original recording.

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

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.

•

Ambisonics and Super DSP preset

parameters

Parameter Options What it changes

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.

MusicLogic

MusicLogic is a music DSP preset based on Pro Logic

II with the addition of user-adjustable steering, designed

to provide an exciting experience with many types of

studio-produced music.

MusicLogic DSP preset parameters

Parameter Options What it changes

Roll Off, Low,

Med, Max

The degree of left-right

steering.

Yaw Off, Low,

Med, Max

The degree of front-rear

steering.

Steered All Steered Rear,

Steered Side,

Steered All

Which of the four

surround channels are

generated by steering.

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Meridian 861 User's Guide Page 33

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