BZB Gear BG-AU88-MA User manual

BG-AU88-MA
8X8 Digital Audio Processor with RS-232,
TCP/IP and PC program control
User Manual

BZBGEAR BG-AU88-MA PRODUCT MANUAL
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 2

BZBGEAR BG-AU88-MA PRODUCT MANUAL
TABLE OF CONTENTS
Statement 4
Safety Precaution 4
Introduction 5
Features 5
Packing List 6
Specifications 7
Operation Controls and Functions 8
Host Computer Control 9
Troubles and Solutions 33
Application Example 33
Tech Support 34
Warranty 34
Mission Statement 35
Copyright 36
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 3

BZBGEAR BG-AU88-MA PRODUCT MANUAL
Statement
Please read these instructions carefully before connecting, operating, or configuring this
product. Please save this manual for future reference.
Safety Precaution
●To prevent damaging this product, avoid heavy pressure, strong vibration, or immersion
during transportation, storage, and installation.
●The housing of this product is made of organic materials. Do not expose to any liquid,
gas, or solids which may corrode the shell.
●Do not expose the product to rain or moisture.
●To prevent the risk of electric shock, do not open the case. Installation and maintenance
should only be carried out by qualified technicians.
●Do not use the product beyond the specified temperature, humidity, or power supply
specifications.
●This product does not contain parts that can be maintained or repaired by users.
Damage caused by dismantling the product without authorization from BZBGEAR is not
covered under the warranty policy.
●Installation and use of this product must strictly comply with local electrical safety
standards.
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 4

BZBGEAR BG-AU88-MA PRODUCT MANUAL
Introduction
This digital audio processor is typically used for video conference, distant learning, and
telemedicine. It features 4-ch MIC inputs, 6-ch linear inputs, and 10-ch linear outputs. Each
analog I/O channel has a knob to control the volume. A DANTE port is also provided to
ensure low latency in the audio process. Apart from HDMI audio embedding and de
embedding, the product can also process audio signals with algorithms, such as, fullband
Adaptive Echo Cancellation (AEC), Adaptive Noise Suppression (ANS), Automatic Gain
Control (AGC), and Auto Mixer, to output a clear, clean and resonant sound with high
Signal-to-Noise ratio. Concise but intelligent, the processor is designed to be applied in
scenarios without additional software assistance for debugging. It is ready to use after
installation, perfect for project implementation and testing.
The product can be applied in a diverse range of installations and applications across
industries, such as, smart system integration in small-medium sized conference room,
instruction recording and distance teaching in education, court trial recording and virtual
court trial in judiciary, surgery recording and video consultation in healthcare service, and
command center establishment in governmental projects.
Features
●HDMI 2.0b compliant
●Provide 4-ch balanced MIC inputs, 6-ch balanced linear inputs and 10-ch balanced
linear outputs
●Support HDMI audio signal input, loop out, audio embedding and de-embedding
●Provide a standard DANTE network audio interface
●Support adaptive feedback suppression function
●Support the full-band adaptive acoustic echo cancellation technology
●Dynamic adaptive noise reduction technology is provided to reduce noise with
signal level up to 18dB
●Auto Mixer function is provided to set the order of priority when multiple
microphones are input at one time
●Inclusive of Digital signal processing modules such as Expander, Equalizer,
Compressor, Auto Gain Control, Limiter, High Pass Filter, Low Pass Filter and Delay
●Support volume control, meter, scene control, etc.
●Capable to switch matrix routings
●48V phantom power supply for 4-ch MIC inputs
●48 KHz sampling rate, 24-bit for A/D or D/A conversion
●Separated I/O volume knobs
●Support monitoring function
●Compatible to run on Win 7 and Win 10, with standard RJ45 interface control
●Support RS-232 serial commands control
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 5

BZBGEAR BG-AU88-MA PRODUCT MANUAL
Packing List
●1x Digital Audio Processor
●1x AC 100~240V 50/60Hz Power Cord
●22x Phoenix Connector (3-pin, 3.81mm)
●1x User Manual
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 6

BZBGEAR BG-AU88-MA PRODUCT MANUAL
Specifications
Technical
HDMI Compliance
HDMI 2.0b
Amplitude-frequency
(20Hz~20KHZ@+4dBu)
MIC input: -0.5 / -0.5dB
Linear input: -0.2 / -0.2dB
THD+N (1 KHZ@+4dBu)
≤ 0.01%
EIN (MIC input)
≤ -125dBu
SNR (linear input)
≥ 90dB
Dynamic Range
≥ 100dB
Channel Level Difference
-0.5 / -0.5dB
Channel Isolation
≥ 80dB
Channel Phase Difference
≤ 0.5°
Max Input Level
20dBu
Max MIC Gain
40dB
Input Impedance
20KΩ
Output Impedance
300Ω
Sampling Frequency
48KHZ
A/D and D/A Conversion
24Bit
Phantom Power
+48 VDC
Connection
Inputs
4 × Balanced MIC [3-pin phoenix connector]
6 × Balanced LINE [3-pin phoenix connector] or
3 × Stereo Audio [3-pin phoenix connector]
Outputs
10 × Balanced LINE [3-pin phoenix connector] or
5 × Stereo audio [3-pin phoenix connector]
1 × Stereo audio [3.5mm L/R]
Controls
1 × LAN [RJ45]
1 × RS-232 [3-pin phoenix connector]
Digital Audio Interfaces
1 × HDMI IN [Type A 19-pin female]
1 × HDMI OUT [Type A 19-pin female]
1 × Dante [RJ45]
Mechanical
Housing
Metal Enclosure
Color
Black
Dimensions
482mm (W)×250mm (D)×45mm (H)
Weight
2.9kg
Power Supply
AC 100 - 240V 50/60Hz
Power Consumption
11W(Max)
Operating Temperature
0°C ~ 40°C / 32°F ~ 104°F
Storage Temperature
-20°C ~ 60°C / -4°F ~ 140°F
Relative Humidity
20~90% RH (non-condensing)
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 7

BZBGEAR BG-AU88-MA PRODUCT MANUAL
Operation Controls and Functions
Front Panel
No.
Name
Function Description
1
INPUT VOLUME
Knobs to control the volume of MIC and linear inputs. Use a screwdriver in the
clockwise direction to turn up the volume; counterclockwisely to turn it down.
2
Power LED
When the device is powered on, the red LED will light on.
3
STATUS LED
When the device runs normally, the green STATUS LED will flash.
4
HEADPHONE
3.5mm headphone listening port.
Note: this listening port outputs the same audio as OUTPUT LINE 5. If you want to
enable the listening function, you need to select the corresponding input channel
in the AUTO MIXER module. For details, please refer to “6.8 Auto Mixer”.
5
OUTPUT VOLUME
Knobs to control the volume of linear outputs.
Use a screwdriver in the clockwise direction to turn up the volume;
counterclockwisely to turn it down.
Note that to turn the I/O knobs allows you to turn up/down the stereo volume, for instance, if you turn the knob of LINE 1
clockwisely, the volume both for LINE L1 and LINE R1 will be turned up at the same time.
Rear Panel
No.
Name
Function Description
1
INPUT
4-ch MIC inputs and 6-ch balanced linear inputs, used for connecting audio source
devices via phoenix connectors.
2
OUTPUT
10-ch balanced linear outputs, used for connecting Amplifier or Speaker via
phoenix connectors.
3
HDMI INPUT
HDMI signal input port, used for connecting HDMI source device via HDMI cable.
4
HDMI OUTPUT
HDMI signal output port, used for connecting HDMI display device via HDMI cable.
5
DANTE
Standard DANTE network audio transmission interface.
6
RS-232
Used for connecting PC or control system via phoenix connector. RS-232 (1) is
used for transmitting RS-232 control commands; RS-232 (2) for firmware upgrade.
7
LAN
Standard RJ45 interface for network connection.
8
BOOT 2-PIN
DIP Switch
Used for firmware upgrade.
Note: it can only be used when the device is in factory. Both 2 pins should be
switched to “1” when the device is in service; if not, the device won’t kick off.
9
DIP Switch
Function reserved.
10
Power Switch &
Power Port
Power switch and AC 100-240V power input port.
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 8

BZBGEAR BG-AU88-MA PRODUCT MANUAL
Host Computer Control
Connection
The audio processor admits the control of a host computer in windows system (WIN 7 or
WIN 10). Take a cable to connect to the LAN port of the processor with the computer for
network connection as following steps instructed. 5 DANTE Standard DANTE network audio
transmission interface.
Step 1: Install the “HDP-AU88P. exe” application in the host computer and change the
computer’s IP address to ensure that IP addresses of the host computer and the processor
(Default IP address: 192.168.0.199, Subnet mask: 255.255.255.0) are within the same
network segment, as shown in the figure below.
Step 2: Double-click the “HDP-AU88P. exe” icon (see the figure below) to run the
application in the host computer.
Step 3: When the application is open, the startup page appears and then comes the HOME
page, as shown below.
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BZBGEAR BG-AU88-MA PRODUCT MANUAL
Step 4: Check the Network icon on the toolbar as shown below.
If there is a red X at the top-right corner of this icon as the figure above shown, it means the
host computer have not connected with the audio processor yet. In such case, click this
icon, then a dialog box with a list of IP addresses of all connected devices will pop out, as
the following figure shown.
Step 5: Choose the audio processor’s IP address and click CONNECT, then the processor
will be connected with the host computer. After connection, the CONNECT & SETUP box
(see the figure below) will pop out. You may close it directly if no such operation is needed.
If the audio processor has been connected with the host computer successfully, the
Network icon will appear in a way as shown below.
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BZBGEAR BG-AU88-MA PRODUCT MANUAL
Volume Meter
The volume meter is typically to denote the signal level of the I/O volume.
The meter has 3 colors (Red, Yellow and Green) to denote signal levels for the volume of
16-ch inputs and 16-ch outputs, in which the Red denotes that volume may be too high to
be limited and the yellow indicates the volume is within a reasonable range.
Input Settings
As shown below, clicking the INPUT module on the HOME page or the IN tab on
the menu bar, you will enter the INPUT setting page.
The following figure shows the details of the INPUT setting page.
SENSITIVITY: Indicates the sensitivity level of the input signal, which could be adjusted to
ensure the sensitivity on the input channel adaptable to the MIC or linear input (function
reserved).
INVERT: When pressed, inverts the polarity of the signal on the input channel.
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BZBGEAR BG-AU88-MA PRODUCT MANUAL
PHANTON: When pressed, turns on 48V phantom power for the channel.
MUTE: When pressed, mutes the input channel, equivalent to clicking the letter M at the
INPUT module on the HOME page.
WHITE: When pressed, generates white noises for signal testing.
PINK: When pressed, generates pink noises for signal testing.
SINE: When pressed, generates sinusoidal signals for testing, the meter below shows the
frequency of the sine wave.
FADER: Controls the signal level of the testing signal.
You can set signal parameters of an input channel by entering its CHAN No. on the right
panel of the IN page. Audio process modules, such as, EXPANDER, EQUALIZER,
COMPRESSOR and AUTO GAIN CONTROL, are available on the right panel for your
setting.
Expander
The Expander, which can effectively extend the dynamic range of the input signal, is used to
eliminate noise under the threshold level.
As shown below, clicking the EXP module on the HOME page or the EXP button on
the right panel of the IN page will give you the option to enter the EXP setting page.
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BZBGEAR BG-AU88-MA PRODUCT MANUAL
The following figure shows complete information to configure the expander module.
THRESHOLD: The level that the signal below it will be identified as noise and attenuated,
with a range of [-60.0, 0.0] dB.
RATIO: The compression ratio for signals below threshold, with a scale of [1.0, 20.0]. If the
ratio is 2.0, it means the signal below threshold will be reduced to ½ of the original.
KNEE: The curve setting of the inflection point of the expander, with a scale of [0.0, 20.0]. 0
indicates a hard knee; others indicate a soft knee.
ATTACK: The time required by the expander to begin the Expander process once a signal
drops below threshold. Values are squashed between [1, 500] ms.
RELEASE: The time required by the expander to stop the Expander process once a signal
is over threshold. Values are squashed between [1, 10000] ms.
G.R. (Gain Reduction): Indicates the amount of gain attenuation of the input signal (in dB)
in the Expander process.
ACTIVE: Activates the EXP process. The function is equivalent to clicking the green letter A
at the EXP module on the HOME page.
Clicking the pair of UP-DOWN arrows of the CHAN No. on the right panel of the IN page will
give you an option to select an input channel for the Expander configuration.
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BZBGEAR BG-AU88-MA PRODUCT MANUAL
Equalizer
Each I/O channel has an 8-band parametric equalizer for voice processing, with the
frequency, gain and bandwidth of each band adjustable.
As shown below, clicking the EQ module on the left panel of the HOME page or
the EQ button of the IN page, you will enter the EQ setting page of the input channel.
As shown below, click the EQ module on the right panel of the HOME page or the
EQ button of the OUT page, you will enter the EQ setting page of the output channel.
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BZBGEAR BG-AU88-MA PRODUCT MANUAL
The figure below shows the setting page of the EQ module.
TYPE: Provides 3 types of band/filter, with High Pass, Low Pass and Peak optional.
FREQUENCY: In High/Low Pass Filter, it means the cut-off frequency of the EQ band; In
Peak Filter, it means the center frequency point of the EQ band; with a scale of [20, 20000]
Hz. GAIN: In High/Low Pass Filter, fixed to 0dB; In Peak Filter, squashed between [-24.0,
+18.0] dB.
Q FACTOR: value is squashed between [0.02, 50.00].
SWITCH: Each band has a switch. When pressed, the EQ function in this band will be
disabled.
ACTIVE: Activates the EQ process. The function is equivalent to clicking the letter A at the
EQ module on the HOME page.
A pair of UP-DOWN arrows on the right panel is provided for you to select an input channel
for the Equalizer configuration.
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BZBGEAR BG-AU88-MA PRODUCT MANUAL
Compressor
The Compressor is used to reduce the dynamic range of the signal above a user
determined threshold so that output sounds could be more solider.
As shown below, click the COMP module on the HOME page or the COMP button
on the right panel of the IN page, you will enter the Compressor setting page.
The figure as below shows the setting page of the compressor.
THRESHOLD: The level that the signal above it will be compressed, with a scale of [-60.0,
0.0]dB.
RATIO: The compression ratio for signals with level above threshold, with a scale of [1.0,
20.0]. When the ratio sets to 2.0, it means that the signal with level below threshold will be
reduced to ½ of the original.
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BZBGEAR BG-AU88-MA PRODUCT MANUAL
KNEE: The curve setting of the inflection point of the compressor, with a scale of [0.0, 20.0].
0 indicates a hard knee; other values for a soft knee.
ATTACK: The time required by the compressor to begin the Compressor process once a
signal is over threshold, with a scale of [1, 500] ms.
RELEASE: The time required by the compressor to stop the Compressor process once a
signal drops below threshold, with a scale of [1, 10000] ms.
MAKEUP GAIN: Since the compressor can reduce the gain level, the Makeup Gain gives
you the option to make a compensation for the gain level, with a scale of [-12.0, +18.0] dB.
G.R. (Gain Reduction): Indicates the amount of gain attenuation of the input signal (in dB).
OUT: Meter indicates the output signal level after the Compressor process.
ACTIVE: Activates the COMP process. The function is equivalent to clicking the letter A at
the COMP module on the HOME page.
A pair of UP-DOWN arrows on the right panel is also provided for you to select any input
channel for the Compressor configuration.
Auto Gain Control
Automatic Gain Control (AGC) intends to control the audio signal within a range so as to
extend the distance of pick-up sounds. The AGC process aims to attenuate the signal with
excessive high signal level and boost the signal with low signal level up to target level. A
pair of UP-DOWN arrows on the right panel is also provided for you to select any input
channel for the Compressor configuration.
As shown below, by clicking the AGC module on the HOME page or the AGC
button on the right panel of the IN page, you will enter the AGC setting page.
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BZBGEAR BG-AU88-MA PRODUCT MANUAL
The following figure shows the setting page of the AGC module.
TARGET LEVEL: The desired output signal level, with a scale of [-20.0, 0.0] dB.
RATIO: The compression ratio for signals above target level, with a scale of [1.0, 20.0]. If the
value sets to 2.0, it means that signals above target level will be reduced to ½ of the
original. 6.8 Auto Mixer The AUTO MIXER is built to set the order of priority for MIC inputs
when 4-ch microphones are open at one time.
MAX GAIN: Indicates the maximum amount of gain that the signal with low level can be
added to by the AGC process, with a scale of [0.0, 12.0] dB.
THRESHOLD: Signals below threshold will remain unchanged while those between
threshold and target level will be amplified (at a ratio determined by the MAX GAIN). In order
to ensure the work of the AGC process, the Target Level must be set higher than Threshold.
The threshold is recommended to set with a range of [-60.0, 0.0]dB.
IN: Meter indicates the detected signal level before the AGC process.
OUT: Meter indicates the output signal level after the AGC process.
ACTIVE: Activates the AGC process. The function is equivalent to clicking the green letter A
at the AGC module on the HOME page.
A pair of up-down arrows on the right panel is available for you to select an input channel
for the AGC configuration.
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BZBGEAR BG-AU88-MA PRODUCT MANUAL
Auto Mixer
The AUTO MIXER is built to set the order of priority for MIC inputs when 4-ch microphones
are open at one time.
As shown below, by clicking the AUTO MIXER section on the HOME page or the
AUTOMIXER tab on the menu bar, you will enter the AUTO MIXER setting page.
The figure as below shows the setting page of the Auto Mixer module.
FADER: Each MIC input channel has a fader to adjust its signal level. It controls the mixed
volume on the input channel.
MUTE: Each MIC input channel has a MUTE button. Clicking it will enable you to mute the
channel.
PR (Priority): Sets the priority of the MIC input, 0 = lowest and 10 = highest priority.
Channel of higher-priority will override the one of lower-priority to be prioritized in the auto
mixer’s algorithm. If two or more channels are at the same priority, the channel for the main
speaker will be prioritized in the AUTO MIXER process.
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BZBGEAR BG-AU88-MA PRODUCT MANUAL
AUTO: When pressed, the input MIC will be added to the auto mixing system, otherwise,
it won’t be auto-mixed.
METER: Indicates the output volume after the AUTO MIXER process.
OUT: Fader to control the output volume after the AUTO MIXER process.
Adaptive Feedback Cancellation
The Adaptive Feedback Cancellation (AFC, also known as the Feed Back Suppression)
module can detect and suppress the frequency point of the acoustic feedback in the audio
field. The AFC module allows you to detect and suppress the frequency points of the
acoustic feedback for 8 bands. Parameters on this module are open to be configured.
As shown below, by clicking the AFC module on the HOME page or the AFC tab
on the menu bar, you will enter the setting page of the AFC module.
The following figure shows the AFC setting page in detail.
MAX DEPTH: The maximum amount of gain that the module allows to reduce, with a scale
of [-20.0, 0.0] dB.
BANDWIDTH: The bandwidth of the filter, with Narrow and Wide optional.
RESET: When pressed, the filter will go back to initial settings and the module will re-detect
the frequency point of the acoustic feedback.
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