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15

 Alero 8-Channel Microphone Mixer Instruction Manual

Configuration

Microphone Settings

It is possible to configure the signal processing modules that operate on the microphone signals from the 

Microphone Settings

 

page (FIG. 30). It is also possible to enable 48 VDC phantom power to microphones from this page.

Signal processing configuration options are defined below. 

FIG. 30  

Configuration of Signal Processing Applied to Microphone Signals.

Signal processing

Options

Default 

Description

Acoustic Echo Cancellation

On/Off

On

Removes recognized echo by subtracting it from the 

transmitted or received signal.

Comfort Noise Generation

On/Off

On

Introduces a synthetic background noise to fill the 

artificial transmission silence resulting from voice 

activity detection. 

Residual Echo Suppression

On/Off

On

Inserts loss to prevent a speaker from hearing his own 

voice.

Light/Medium/Strong Medium

Noise Reduction

On/Off

On

Reduces noise as it occurs for live broadcast 

applications.

0 dB to 24 dB

12 dB

Summary of Contents for ALR-AEC-8 ALERO

Page 1: ...INSTRUCTION MANUAL ALR AEC 8 ALERO 8 CHANNEL MICROPHONE MIXER ...

Page 2: ...let 10 PROTECT the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus 11 ONLY USE attachments accessories specified by the manufacturer 12 USE ONLY with a cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When a cart is used use caution when moving the cart apparatus com...

Page 3: ... recast Directive 2012 19 EU You may obtain a free copy of the Declaration of Conformity by visiting http www amx com techcenter certifications asp WEEE NOTICE ESD Warning The icon to the left indicates text regarding potential danger associated with the discharge of static electricity from an outside source such as human hands into an integrated circuit often resulting in damage to the circuit WA...

Page 4: ...ctor 6 Power Connector 6 Installation 7 List of Supplies 7 Placement 7 Connections 7 Connect to the Network 7 Connect Power 8 Connect Audio Conference Equipment 8 Connect Video Conference Equipment 8 Microphone Connections 9 Detect IP address 9 Configure Microphone Inputs 9 Configure Input Output Channels 9 Configuration 10 Network Configuration 10 Reset Button 10 Levels 11 Signal Levels 11 Microp...

Page 5: ...Table of Contents v Alero 8 Channel Microphone Mixer Instruction Manual Active Mute Groups 14 Microphone Settings 15 Basic Configuration 16 Save and Load Settings 16 Firmware Upgrade 16 Factory Reset 16 ...

Page 6: ... channels are automatically combined into one output channel The microphone mixing performs a selection of which channel to open reducing overall noise level and improving speech clarity compared with just adding all microphone channels Acoustic Echo Cancellation AEC Models the acoustic environment and removes the loudspeaker echo via adaptive filtering Residual Echo Suppression RES Additional sup...

Page 7: ...ovides 4 4 A of DC power and is optional ordered separately It includes a 3 5 mm Phoenix Connector with retention screws and a 6 foot 1 83 m IEC po wer cord terminated with a grounded Edison plug for AC input U S only Refer to http www amx com products for further details FIG 2 Mixing of Processed Microphone Channels with Input to Form Output Signals FIG 3 AMX External 13 5Vdc Power Supply ...

Page 8: ...it green LED Indicates that the unit is powered on 2 MICROPHONES SIGNAL A continuously lit green LED will flicker indicating an active signal on the corresponding eight microphone channels 3 MICROPHONES CLIP Eight red LEDs indicate risk of amplitude clipping on corresponding channel due to a strong signal LED is only active for a short time after a strong signal is detected Reduce gain on the chan...

Page 9: ...og line levels for inputs and outputs This interface can be used for a separate audio conference device with POTS dialing capabilities or used as a record and playback interface PA Speaker Output The 5 pin 3 5mm Phoenix speaker connection PA provides a room line level left and right channel outputs to connect to an amplifier or amplified device This could go to an Enova DVX All In One Presentation...

Page 10: ...ones into five mute groups These five groups are muted using an external contact closure The contacts connected through the 5 pin 3 5mm Phoenix connector labeled MUTE FIG 11 provide a connection to ground to mute the microphone inputs assigned to the corresponding group through the web interface USB Port The USB port provides a serial bus using a Standard B connection on the Alero It can be used t...

Page 11: ... 45 connector and front panel Speed Indicator Speed LED yellow lights On when the connection speed is 100 Mbps Ethernet connection and turns OFF when the speed is 10 Mbps The following diagram shows the pin connections for the RS 232 RJ 45 port connector Power Connector The power connector is a 3 5mm Phoenix connector with retaining screws to hold the connector secure to the Alero unit FIG 14 Aler...

Page 12: ...tallation Ensure all cables run between the equipment are not a tripping hazard Make a quick diagram of your conference room equipment to try and visualize where the Alero will fit in FIG 15 shows what a typical AMX equipped conference room might look like with Alero placed between a DVX and the Conference equipment Connections Make connections to Alero as needed following these guidelines Connect...

Page 13: ...nnect the input and output channels to the Alero rear panel Line In and Line Out 2 The Alero USB port is used to pass audio to local equipment used to make conference calls i e a local room PC being used to make Skype calls If using the USB port for Audio output connect the cable to the USB port FIG 19 Connect Video Conference Equipment 1 If using a video conference device connect the audio inputs...

Page 14: ...sappears from the zeroconf utility Configure Microphone Inputs 1 Select 48 VDC phantom power on off for each microphone Refer to Microphone Settings on page 15 2 Adjust gain settings for individual microphones Approximately balance the signal levels for all microphone channels in a typical setup 3 Configure signal processing on each microphone channel Refer to Microphone Volume on page 11 Configur...

Page 15: ...Configuration The default Alero IP and other network settings can be configured on the Network Configuration page FIG 22 On this page users may also enable DHCP to have an IP address assigned by the network automatically NOTE If the manual settings are bad the device will not be accessible via a configuration page since the network connection will not work If this happens follow the procedure Fact...

Page 16: ...l from clipping Indicators are provided for each output that display when the signal has reached the limiting threshold by filling in the circle Microphone Volume In audio mixers there is generally a two stage volume control Stage one Input Gain compensates for the wide range of levels that may be presented by the various types of microphones with diverse gain structures Stage two provides a compe...

Page 17: ...d attempts to regulate the volume output based on the mic input receiving the strongest signal Channel Volume The Channel Volume section also enables users to adjust Input Gain and Volume Level on each of the Alero Input and Output channels Set each channel as needed Signal Mixing The Signal Mixing page enables users to specify which inputs to Alero are connected to specific outputs which micropho...

Page 18: ...n the mic column that corresponds to the output channel row The blue square will turn white once it has been disabled Active microphones are displayed by an ACTIVE indicator FIG 27 It is possible to disable AMM for individual output channels by pressing the gray AMM symbol under the output channel shown in the chart below This causes all the AMM symbol to turn white and the microphone signals in t...

Page 19: ...y be muted by setting the corresponding pin of connection 6 shown in the table on page 4 to ground An indicator shows the state of each of the five mute groups muted active unmuted not active as well as a selection matrix for assigning microphones to the different groups Note that one microphone can be placed into several groups The microphone is muted as long as any mute group it is assigned to i...

Page 20: ...al Processing Applied to Microphone Signals Signal processing Options Default Description Acoustic Echo Cancellation On Off On Removes recognized echo by subtracting it from the transmitted or received signal Comfort Noise Generation On Off On Introduces a synthetic background noise to fill the artificial transmission silence resulting from voice activity detection Residual Echo Suppression On Off...

Page 21: ...ge FIG 31 1 Click Choose file to select a new firmware file from the local computer The naming convention of new firmware releases is firmware package_yyyymmddhhmm bin 2 When the new firmware is selected press the upload button to start the firmware upgrade Alero will update the firmware and restart Settings will be stored and used with the new firmware Factory Reset If somehow the product has end...

Page 22: ...istered trademarks of their respective companies AMX does not assume responsibility for errors or omissions AMX also reserves the right to alter specifications without prior notice at any time The AMX Warranty and Return Policy and related documents can be viewed downloaded at www amx com 3000 RESEARCH DRIVE RICHARDSON TX 75082 AMX com 800 222 0193 469 624 8000 1 469 624 7400 fax 469 624 7153 Last...

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