User manual POLYCOM EF2201

[. . . ] Vortex EF2201 Reference Manual VORTEX EF2201 REFERENCE MANUAL Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Features and Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pre-Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 EF2201 Front and Rear Panels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Mounting the EF2201 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Connecting the EF2201 to Other Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Though the EF2201 allows for positive output gain, you should always try to adjust input gains to a good level so that the output gain is 0 dB. If you find that you need a positive output gain from the EF2201, first check your input gain to make sure you are getting a good level (around 0 dB). Keep the output gain at around 0 dBu. Mute Output. Use this to mute or unmute the phone output. Enables or disables compression on Output T. Figure 11. EF2201 Outputs submenu MATRIX SETTINGS The MATRIX menu includes gain and mute adjustments for the main matrix (Out T, In T, In PM0, PM1, WM0, WM1, etc. ) and the submatrix (P submatrix, W, X, Y, and Z submatrices). Matrix Main Matrix Gain Mute SubMatrix Gain Mute Figure 12. EF2201 Matrix submenu © Polycom, Inc. 19 VORTEX EF2201 Reference Manual LCD MENU STRUCTURE PARAMETRIC EQ MENU The input equalizer is comprised of up to 5 bands of filtering. The whole group of filters for the channel can also be enabled/disabled without losing the settings for each band. For each band, you first select the type of filter from the following: Parametric/ Peaking, High Shelf, Low Shelf, Lowpass, or Highpass. Parametric EQ Input/Output EQ Channel Band Filter Type Frequency Bandwidth Gain Slope Filter Enable Parametric/Peaking. · Center Frequency: in Hz, between 20 Hz and 20, 000 Hz in 1 Hz steps. · Bandwidth: in octaves, between 0. 05 and 2 octaves in 0. 05 octave steps. · Gain: in dB, between -20 and +20 in 1 dB steps. · · Center Frequency: in Hz, between 20 Hz and 20, 000 Hz in 1 Hz steps. Bandwidth: in dB/octave, between 1 and 24 dB/octave, but is always less than or equal to 1. 2 x Gain. · Gain: in dB between -20 and +20 in 1 dB steps. · · Center Frequency: in Hz, between 20 Hz and 20, 000 Hz in 1 Hz steps. Bandwidth: in dB/octave, between 1 and 24 dB/octave, but is always less than or equal to 1. 2 x Gain. · Gain: in dB between -20 and +20 in 1 dB steps. · Cutoff Frequency: in Hz, between 20 Hz and 20, 000 Hz in 1 Hz steps. · Cutoff Frequency: in Hz, between 20 Hz and 20, 000 Hz in 1 Hz steps. Center frequency on Parametric/Peaking is the point with the most (or least) gain. Bandwidth is the width halfway up the peak (so if the peak is 10 dB, it is the width between the points where the gain is 5 dB). [. . . ] Please contact Polycom Installed Voice Business Group for repairs. Attempts to repair this product by an unauthorized technician will void your warranty. State Law Rights This limited warranty gives you specific legal rights, and you any have other rights that may vary from state to state. © Polycom, Inc. 35 VORTEX EF2201 Reference Manual DEFINITION OF TERMS DEFINITION OF TERMS Acoustic Echo Acoustic echo occurs in a conferencing or distance learning system when the remote speech played in the loudspeakers is picked up by microphones in the room and is transmitted back to the remote end. This transmitted signal is a delayed version of the original, which causes the echo. Acoustic Gain Acoustic gain is a term used in conjunction with sound reinforcement. It refers to how much louder the audio is with sound reinforcement compared to without sound reinforcement. Ambient Level The ambient level, also referred to as noise floor, is the background noise heard in a room when no one on the near or remote end is talking. Automatic Gain Control (AGC) Automatic Microphone Mixer Convergence Rate Automatic gain control increases or decreases the gain on an audio signal to an acceptable value. A microphone mixer that turns microphone channels on and off based on the signal level going into the microphone. Convergence rate refers to the amount of echo a line or acoustic echo canceller can cancel per unit time, typically expressed in dB/sec. [. . . ]