Williams Sound PPA R37 Guide de l'utilisateur télécharger pdf (Page 16)

LOW PASS FILTER (M6)

The low pass filter will help to remove high frequency “noise” from the transmitted audio signal. This is typ-

ically used when there is a hiss in the audio line as a result of room noise, speech sibilants, or other high fre-

quency unpleasantries.

To select a Low Pass Filter cutoff frequency:

1) Press the down “ ” menu button (Figure 12) to select the LCD “Low Pass Filter” (M6) screen.

2) Press the “+” menu button to increase the cutoff frequency selection.

The cutoff frequency can be increased to a maximum of 16.0 kHz.

Press the “-” menu button to decrease the cutoff frequency selection.

The cutoff frequency can be decreased to a minimum of 3.2 kHz.

3) When the desired cutoff frequency is displayed, press the “Set” button to save the change

into memory.

No additional action is necessary

. After 30 seconds of inactivity, the LCD screen will return to the

default display.

COMPRESSOR SLOPE (M7)

Compression is typically used for voice and hearing assistance applications. It reduces the dynamic

range: For a listener who has difficulty hearing the quiet sounds of an audio broadcast, compression

will boost the quiet sounds to louder listening levels. For listening to music programs, concerts, etc.,

lower compression ratios or no compression is generally used.

The Compressor Slope has the following selectable compression ratios:

1:1 and 2:1

NOTE: The T35 is shipped from the factory at a 1:1 compression ratio (no compression).

To select a compression ratio:

1) Press the “ ” menu button (Figure 12) to select the LCD “Compressor Slope” (M7) screen.

2) Press the “+” menu button to increase the compression to 2:1.

This produces generally loud out

put, even at very low audio level signals.

Press the left “-” menu button to decrease the compression to 1:1, which is no compression.

3) When the desired compression ratio is displayed, press the “Set” button to save the

change into memory. No additional action is necessary.

NOTE: The installer of the T35 needs to take care in using compression, because some hearing

impaired people cannot tolerate as loud of a sound as those with normal hearing.

IMPOR

TANT: Listen to the transmitted audio thr

ough the headphone jack, especially when

deciding on an appropriate low pass filter. This is a good way to ensure the listening audi-

ence is going to receive the highest audio quality.

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Williams Sound PPA R37 Guide de l'utilisateur Page 16