Sound Performance Lab 9319, 9320 owner manual Harmonics, Ture

Control elements

Fig. 4:

The dotted line shows frequency responses for a soft Bass (SOFT) at varying

PROCESS and a MID-HI TUNE

of 3.5 kHz.

The solid line shows the phase responses, which always drift only a few degrees if the PROCESS inten- sity is increased.

The diagram shows very clearly that the mid attenua- tion gets stronger as the PROCESS value increases.

STEREO VITALIZER alters the frequency spectrum in such a way that the balance is maintained between all frequency ranges even at varying monitor volumes. For the human ear, the sound is more pleasant and easier to perceive than the original. In other words, increasing the PROCESS value also increases the intensity of the MID-HITUNE filter and the BASS filter, whilst dominant mid frequencies are damped by amplitude- controlled phase shiftings. This improves the perception of loudness, clarity and the bass punch, i.e. the strength and fullness of the audio signal.

Harmonics

An improved harmonic struc- ture results in a silky top-end with far better separation and intelligibility.

6	The STEREO VITALIZER works with steep filters and controlled changes of
	the phase relationships of the harmonics to process the harmonics struc-

ture.

We consciously did without the generator principle of »Exciters«. The STEREO VITALIZER's harmonic filter does not add any distortions to the original signal, unlike with the generator principle. It extracts all the infor- mation it needs from the original signal. This significantly reduces the hearing fatigue effect on the listener. By influencing the phase relationship in an intelligent fashion, the harmonics which have been filtered out are emphasized with increasing addition expressed as a percentage. The effect significantly improves the speech intelligibility and the transparency. Old archived recordings sound fresh and silky again. The brilliance of any audio signal can be improved without it sounding sharp.

The HARMONICS filter derives its input signal from the original signal and the output of the MID-HITUNE filter. If you close the PROCESS control (extreme left), the BASS and MID-HITUNE controls do not function any more. You can then listen to the HARMONICS control separately.

The second potentiometer level of the MID-HITUNE control is responsible for the cut-off frequency of the HARMONICS filter. A variation of the MID-HITUNE control alters the cut-off frequency (fundamental tone) of the harmo- nics. Both filters complement each other in an ideal fashion as they each always process the part of the audio signal which is not being processed by the other filter. If the MID-HITUNE control is set at 20 kHz, the HARMONICS

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