Using The Vqr; Low Band; Hi Band - Solidyne HL 202 Manual De Usuario

TELEPHONE HYBRIDS HL202 & 203VQ ENGLISH
are not important for the understanding of the words, ARE VERY IMPORTANT FOR THE AUDIO
QUALITY, because they give "weightiness" and "presence" to the voice. System VQR really
reconstructs the bass of the voice, reaching the frequencies of up to 50 Hertz, being able also
reconstructing component of high frequency to recreate the highs that are of extreme importance to
obtain the presence sensation.
In addition, stage VQR has a third control to improve to the dynamic range, obtaining values of up to
70 dBA in a telephone transmission.
This processing is applicable as much to calls by terrestrial lines, like a calls made through the
mobile telephony. Although the reconstruction reaches to callings made using the internal
microphones of the cellular or the fixed telephones, the best results are obtained using a portable
audio console and dynamic microphones of good quality.
For details on VQR, please consult the information available in the section "Technical
Documentation" on our Web site.

3.6.1 Using the VQR

The VQR processing can be enabled or bypassed pressing the VQR button on the front panel.
The user adjusts the amount of processed signal using the knobs "Low band" and "Hi Band". Both
controls even have an ample rank of work, making possible the processing in telephone signals
whose bandwidth is very restricted.

Low band

Manages the level of lows added to the original signal. With the fader closed there is no
reconstruction for low frequencies.
The level of reconstruction, or amount of low frequencies that is possible to add to the signal,
depends on the audio quality of the telephone line (all communications don't transmit the same
bandwidth) and the telephone or microphone used at the other end. Obviously, same results are not
obtained using the small microphone of a cellular telephone or a microphone of good quality with a
portable console. at least quality has the transmission (smaller bandwidth) smaller will be the action
of VQR processing.
Make sure to listen to the processing in the main monitors of the control room, to avoid an excessive
reinforcement of lows in the processed signal; that can take place if you are monitoring the
communication using small headphones or loudspeakers of bad quality.

Hi band

It controls the level of high frequencies added to the original audio coming from the telephone line.
With the fader closed the high processing deactivates.
The action of this control is much more critical that the Low Band, since an excess of highs
processing will generate an "artificial" sound; and in extreme case "crashed high" sound can take
place, that will be annoying to the listener.
On the other hand, consider that an A.M. radio can require more emphasis in high frequency than a
FM; to obtain a well-known improvement on the air; therefore the control Hi Band has an ample rank
of action.
The reconstruction level -or amount of highs added to the signal- depends on the quality of the transmission. This stage will be affected, mainly, if the line has much background noise.
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