Knowledgebase: Xdevel > Sonika Due
Sonika Due - a Software / Hardware based Audio Processor
Pubblicato il 15/12/2008 alle ore 17.47.50

Sonika Due

Sonika is a software/hardware based audio processor and it implements a classic two band scheme with separate high-frequency limiter.

Every processing band, bass, medium and high, has a compressor, downward expander and limiter fully configurable by the user.

The sound is mainly controlled by the two B-M bands, the remaining H band is an additional preemphasis / high frequency limiter.

System Requirements for software-based version
CPU
Pentium 
4 2Ghz or better
OS Windows XP SP2 or later
Audio Device ASIO 192KHz full duplex (must handle 192k in sampling and playout, most audio devices can handle it only in playout)

Band Selection


You can select the band to modify by clicking on the corresponding letter on the box 1.

B stands for BASS band, M stands for MIDBASS to HIGH band and H stands for HIGHS.


Process Selection

 
You can select the process by clicking on the box 2:

COM is the compressor, EXP is the downward expander, LIM is the limiter.


Process ON/OFF Selection

You can turn a whole process on and off clicking on the corresponding "ACT" label on the box 3.

When "ACT" is on, the process is ACTive.


Band Processing Controls

RAT: Ratio of compression of the compressor or expander (this control is hidden if you act on the limiter). A ratio of 1.0 is equal to "no process" at all, while, with a ratio of 10.0, the compressor acts most as a limiter and the expander acts most as a noise gate.

THR: threshold where, above for compressor/limiter or below for expander, the process start to modify the dynamic.

ATT1/ATT2: it sets the time in milliseconds the compressor, limiter or expander, takes to make a change on the signal once it passes the threshold.

Fast attack times will reduce the final distortion at the expense of unnatural sound.

DEC1/DEC2: it sets the time in milliseconds the compressor, limiter or expander, takes to recover to steady state once the signal goes below the threshold.

Fast release times will lead to a more perceived loudness at the expense of a hear-fatiguing sound.


Other controls:

BASSCLIP: sets the clipping threshold for the bass clipper.

HFCLIP: sets the clipping threshold for the high frequency clipper.

OUT CLIP DRIVE: sets the amout of driving of the final clipper.

INDRIVE: sets the amount of amplification for the input signal. Adjust it to get, with normal program material, a compression level of 10-15dB.

GATE LEVEL: sets the point below which the compressor release will be "forzen". The purpose of this is to avoid the compressor to always try to raise the volume even on quiet music passages. Adjust it to make the label "GATE" to be coloured in green with normal program material. It is normal that the label, even under normal conditions, sometimes turns to gray colour.

LINK: sets the amount of linking of the bass and medium-high bands. Setting it towards 0, will make the two bands to operate fully independently, so a sort of bass frequencies auto-equalization will be applied. Setting it towards 100 will result in an output sound texture very close to the input.

BRILLIANCE: applies a gentle equalization to the upper part of the spectrum.

COMP-CLIP: set the tradeoff between compression and clipping. Moving it towards CLIP will result in a more loud sound, at the expense of distortion, while towards COMP will result in a quieter but cleaner sound.

MPX-RDS Generator

 
57KHz phase:
(arbitrary units) sets the phase difference between the pilot tone and the 57KHz suppressed carrier.

57KHz level %: sets the level (in % related to 100% ± 75KHz modulation) of the RDS subcarrier.

Usually values around 5% are employed.

RDS Checkbox: turns the RDS modulator on and off.

AFs - Alternative Frequencies

Alternative Frequencies

In this page you can set the main parameters for the RDS coder and the alternative frequencies.

PTY: sets the format of your station. Many car and home receivers are equipped with functions to seek the band, choosing only those stations that meets the user's preferences.

PI: this is the Program Identification code (hexadecimal 4 digit code). It must be choosen carefully and it is built according your country rules.

RT: Radio text, a 64 characters string that can be show on some receivers.

NOTE: Up to 25 frequencies per list can be inserted on a maximum of 4 lists and you can choose the best suited method, A or B, for your network.

There is no particular flag which indicates to the receiver whether the alternative frequencies were packed using method A or B, it is just the order in which you put the frequencies on the list.


Checkboxes

TA: Traffic announce actually on air. Check this while you are transmitting a traffic announcement. Many receivers, for example, will stop the current listening of a CD, and will let you hear the traffic announcement while this flag is set.

TP: Traffic program. Check this is your station usually transmit traffic announcements. Beware that many car radios are set by default to tune preferably only those stations which have this flag turned on.

MUSIC: This flag indicates whether music or speech is being broadcast. This information is used by some receivers where separated volume controls, one for the music, another for the speech, are present.

STEREO:This flag indicates whether the program transmitted is stereo.

ARTIFICIAL HEAD: This flag indicates if the stereo program being trasmitted was recorded using an artificial head.

COMPRESSED: This flag indicates if the program being transmitted is dinamically-compressed.

Editing

Select the cell you want to edit on the grid, press ENTER.

A new frequency (default 98.0MHz) will be inserted, you can edit its value using the "+" and "-" keys. Pressing the "CANC" key will delete the current frequency.

METHOD A:

This method is the most simple and it is suited for radios with a maximum of 25 alternative frequencies. Simply put all your frequencies into a list.

Example:

91.3

104.5

88.5

104.1

...


METHOD B:

This method is suited where more than 25 frequencies are present or if, in different regions, you broadcast different programs from time to time.

In this method, the number of repeaters is equal to the number of lists occupied, so every repeater will broadcast its frequency and all possible alternatives.

With a particular combination of main frequency - alternative frequency, it can be defined whether that alternative frequency always broadcast the same program as the main or, in different times, it broadcast different programs.

Each list starts with the frequency of the main repeater and the remaining 12 pairs are the main frequency and a valid alternative and if, for a given main frequency, the number of alternatives is larger than 12, the list must be split in two or more lists.

If a main frequency is used more than once on a network, its list of alternative frequencies must be separated by another list to inform the receiver that the duplicated frequency belongs to a different repeater.

The frequency pairs are generally transmitted in ascending order when the two frequencies carry the same program. Descending order is used when that alternative frequency belongs to a different region or carry different programs from time to time.

Example, consider the following network

Method A:

88.5

97.2

103.5

104.5

Method B: all repeaters broadcast the same program except 88.5 that is a regional variant of the network.

AF LIST 1

97.2

This is the main frequency, all the following pairs belongs to the same repeater.

97.2

This pair is in descending order because 88.5 is a regional variant of the network

88.5

97.2

This pair is in ascending order because 103.5 always broadcast the same program as the main frequency

103.5

AF LIST 2

103.5

This is the main frequency, all the following pairs belongs to the same repeater.

103.5

This pair is put in descending order because 88.5 is a regional variant of the network.

88.5

97.2

This pair is put in ascending order because 97.2 always broadcast the same program as the main frequency

103.5

103.5

This pair is put in ascending order because 104.5 always broadcast the same program as the main frequency

104.5


AF LIST 3

88.5

This is the main frequency, all the following pairs belongs to the same repeater.

97.2

This pair is put in descending order because 97.2 can carry a different program

88.5

103.5

This pair is put in descending order because 103.5 can carry a different program

88.5

AF LIST 4

104.5

This is the main frequency, all the following pairs belongs to the same repeater.

103.5

This pair is put in ascending order, 103.5 always carry the same program.

104.5

PSN Method

Up to 20 PSN (Program Station Name) can be inserted into the RDS encoder.

For each PSN the user can select the enabled or disabled status, the on screen persistence, the alignment.

To edit a PSN, click on the row of the grid you want to edit, then modify it using the controls on the left, then, to apply the editing, press the "update" button.

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