Williams Sound PPA R38 User Manual download pdf (Page 17)

Personal PA

DSP FM Wideband Transmitter

RF Output = Full Power

Parameters: Hearing Assist Music Voice

Low Pass Filter 8.0 kHz 16 kHz 6.3 kHz

High Pass Filter 500 Hz 31 Hz 125 Hz

Compression Ratio 2:1 1:1 1:1

IMPORTANT: Listen to the transmitted audio through the headphone jack, especially

when deciding on an appropriate high pass lter. This is a good way to ensure the

listening audience is going to receive the highest audio quality.

By default, the T45 is shipped in the Music mode. For music, concerts, and other applications where the highest audio quality is

desirable, Music is the recommended mode of operation. For hearing assistance applications, or applications where the message

is critical for listening, Hearing Assist is the recommended mode of operation. For speaking and other voice applications, Voice

is the preferred mode of operation.

If the three preset congurations do not meet the needs of the venue, the Custom audio preset can be used. The custom preset

allows the user to adjust the High-Pass Filter cutoff frequency, Low-Pass Filter cutoff frequency, and choose the Compression

Ratio. If the audio preset is changed from Custom to Music, Hearing Assist, or Voice, the Custom settings are overwritten.

High Pass Filter

A High Pass Filter cuts off low frequencies and lets high frequencies “pass” through. The frequency chosen is the point where the

cutoff takes effect. The high pass lter will help to remove low frequency “noise” from the transmitted audio signal, such as room

noise, a line hum, or breath accents picked up from an improperly installed microphone.

Low Pass Filter

A Low Pass Filter cuts off high frequencies and lets low frequencies “pass” through. The frequency chosen is the point where the

cutoff takes effect. The low pass lter will help to remove high frequency “noise” from the transmitted audio signal, such as hiss in

the audio line as a result of room noise, sharp speech sounds, or other uncomfortable high frequency sounds.

Compression

Compression reduces the dynamic range of the audio (volume difference between loud and soft sounds). It is typically used

for voice and hearing assistance applications - for a listener who has difculty hearing the quiet sounds of an audio broadcast,

compression boosts the quiet sounds to louder listening levels. For listening to music programs, concerts, etc., lower compression

ratios or no compression is generally used.

The T45 has three selectable modes of compression: 1:1 (compression off), 1.5:1 (low compression) or 2:1 (high compression).

For applications such as music and voice, where high audio quality is desirable, 1:1 is the recommended mode of operation. For

hearing assistance or applications where the transmitted message is critical for listening, 1.5:1 or 2:1 is recommended.

NOTE: The T45 is shipped from the factory at a 1:1 compression ratio (no compression).

NOTE: The manager of the T45 needs to take care in using compression, because some hearing impaired people

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

To select a precongured Audio Preset:

1. Press the Menu button. The display will show “AUDIO SETTINGS” in the selection box.

2. Press the “>” button to display “AUDIO SOURCE” in the selection box.

3. Press the “v” button twice to display “AUDIO PRESET” in the selection box.

4. Press the “>” button to access the Audio Presets. The currently selected preset is shown in the selection box.

5. Press the “^” or “v” menu buttons to select either “VOICE”, “MUSIC”, “HEARING ASSIST” or “CUSTOM” audio. Note that

the setting changes live, it does not need to be “selected” with another button. The setting displayed in the selection box

is the one that is active. Refer to the Conguration Table in Figure 11 for details about each preset.

6. When the desired Audio Preset is selected, press the Menu button to exit the menu and return to the main info screen.

No additional action is necessary. If no buttons are pressed, after 5 minutes the OLED will return to the Main Info Screen, then

after another 10 minutes show a screen saver, then go blank (the time between the screen saver and blank screen is adjustable).

When the display is blank, and the “RF” indicator is lit, the transmitter is broadcasting. If audio is present the audio input level

LED’s will pulse with the level of the audio.

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Williams Sound PPA R38 User Manual Page 17

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