Generator Quick Doc

LF Generator Quick Doc.

LF Generator
Direct-X VST plug-ins

License : 6 or 8 or 9

- LF Generator

The very first steps

STEP -1- : Select a function (e.g. sinus).

STEP -2- : Adjust Signal Frequency.

STEP -3- : Set the Gain of the signal to be produced.

STEP -4- : Switch On the Generator (On/Off button).

Concept

The LF Generator is a simple low frequency generator. It features the minimum requisits for producing the most common digital audio signals (e.g Sine, Pink Noise......). It will therefore perfectly fit in with your benchmarking tools and will let you check any piece of digital equipment (software or hardware).

Section 1 :

This section lets you choose in which way the generator will produce sound.

The PLAY/STOP push button simply starts and stops the generator.

The Duration selector (default value set to Infinite) allows you to restrict the length of the wave produced by the generator when you switch it on. This way, you can generate pulsating waves of any type.

The CUT ON LEFT, when enabled, cuts the signal on the left channel (set by default to a 300-ms cut occuring every 3 seconds). This allows you for example to calibrate a tape-recorder while checking that the left/right connections are OK.

Section 2 :

This section lets you deal with levels and routings..

SIGNAL THRU allows a signal getting into the plug-in to be thruput unmodified. This is useful, for instance, if you want to use several generators in series or if you want to carry out feedback tests : for example, if you want to check the latency of an audio system, you just have to measure the time elapsed between the produced pulsation and the returning one.

The Gain knob sets the gain for the generated signal. Four preset buttons give you four predefined gains for quick settings.

The Trim knob is here to let you calibrate the generator's output gain according to your hardware if needed.

The panoramic is simply a left/right balance control.

Section 3 :

The Wave Generator and SWEEP mode user interface.

When SINUS is selected, the generator produces a simple wave following Frequency, Phase and DC-Offset parameters.

At the bottom you can modify the wave type via four buttons : SINUS, TRIANGLE, SAW and SQUARE.

When switching on SWEEP mode, the produced wave keeps sweeping progressively from F.MIN to F.MAX (or the opposite, depending on the Direction Button) in a time set by the TIME parameter.

CYCLE mode enables an infinite circular sweeping movement.

Section 4 :

This section allows you to generate noise.

When NOISE is switched ON, the generator produces one of the 5 sound types listed below.

DIRAC PULSE sound is a very brief sound as it represents a positive pulse wave with a length of only one sample (it allows you to check the impulse response of a digital audio processor).

Three buttons to produce PINK noise : stereo in phase (0°), out of phase (180°) or pure de-correlated (stereo).

At last, the generator can produce a sound containing 31 sine waves, all normalized upon the frequencies of an equalizer or a 1/3-octave analyzer.