Telex ISP-100 manual Cut, Attenuation and Polarity, Attenuator

8-24

Cut

Figure 8-11Cut component.

The Cut (see Figure 8-11) can apply as much as 96 dB attenuation, or mute completely, and invert polarity.

Attenuation and Polarity

Application of attenuation is accomplished by multiplying each data sample by a number whose absolute value lies between 1.0 (0 dB) and 0.000015625 (-96 dB). Muting is accomplished by multiplying each sample by zero. Polarity inversion is accomplished by multiplying by a negative number. All gain and polarity changes are soft, meaning that they are gradually changed from the old setting to the new in order to help prevent the occurrence of clicks or pops.

Bypass

Bypassing cut is equivalent to setting its attenuation to 0 dB and its polarity to + (in-phase). Bypassing a muted attenuator un-mutes it.

Attenuator

The attenuator can be set three ways:

Using the Knob

Click on the indicator on the knob and while continuing to hold down the mouse button, move the mouse in an arc. The numbers in the box below the knob will change. When the desired level is reached, release the mouse button.

Using the Text Box

Click in the box. Using the Back Space and/or Delete keys erases the current entry and enters the new level. Be sure to press the Enter key after the entry is made. Clicking outside the text box without pressing the Enter key will cause the setting to return to the number that it was before a change was attempted. Alternatively, click and drag across the number in the box to highlight the number in it. Type the new setting and press the Enter key when finished.

Using the UP/DOWN Arrows

To increase the level, click on the up arrow. To decrease the level attenuation, click on the down arrow. The amount of increase or decrease is controlled by the fine/coarse control.

10 July 1998