Chongqing Xiegu Technology GNR1 Digital Audio Noise Filter User Manual
- June 4, 2024
- Chongqing Xiegu Technology
Table of Contents
Technology GNR1 Digital Audio Noise Filter
User Manual
GNR1Digital Audio Noise Filter
Operating Instruction
CZ:210910-01
Ver: 1.0.0 Date: 2021-09-10
Chongqing Xiegu Technology Co., Ltd.
Introduction
GNR1 digital audio noise filter is an audio processing device integrating digital noise reduction and digital filtering. It can be widely used in the external audio processing sector of all types of wireless receiving equipment such as radio transceiver, receiver, and radio, to effectively reduce the background noise, improve the signal-to-noise ratio, and improve the signal identifiable degree. GNR1 supports to connect external passive speaker, which can provide 3W audio output power; support independent adjustment of input/output sound volume; supports selection of high/low input impedance; support audio double output ports (3.5mm stereo output, RCA output); support headphone output and automatic switch of headphone/speaker output.
Basic Indicators
Digital denoiser SNR upgrade degree: More than 22dB
Digital filter frequency response range: L-CUT adjustment range: 5Hz-1280Hz
H-CUT adjustment range: 500Hz-5615Hz
Headphone driving power: 100mW@Max
Headphone output impedance: 16~64
Input impedance range: Low impedance of 16, high impedance of 10k
Speaker output power: 3W (8, THD0.2%)
Speaker output impedance: 4~16
Operating voltage: DC12V:t15%
Volume: 15944143mm
Operating Instruction
3.1 Description of Panel
Front panel ****
Rear panel
3.2.1 Wiring
The input is a mono channel, and its interface is a 3.5mm stereo jack. Two
tracks are connected by the internal wiring. Do not use the mono channel jack,
or you will cause a short circuit and no sound to the input!
The output is also a mono channel, with two jacks: RCA jack, 3.5mm stereo
jack. This stereo interface also connects two channels in the device. Do not
use the mono channel jack, or you will cause a short circuit and no sound to
the output!
The external power is DC 12V ± 15%, you can directly use the 13.8V power of
the radio equipment to supply power for this.
Do not use it under over-voltage! Do not directly power with 220VAC!
3.2.2 Selection of input impedance.
Reasonably select the high/low input impedance level for GNR1 according to the
audio output impedance of the device you are using. You may turn down the
output sound volume if you select it improperly.
3.2.3 Adjustment of input sound volume
You can adjust to the appropriate sound volume to keep a proper output sound
volume and distortionless sound quality. You can adjust it in cooperation with
the output sound volume. If the input audio amplitude is so high that the
input is overloaded, the CLIP indicator on the panel will be on, so you should
turn down the input sound volume at this time.
3.2.4 Adjustment of output sound volume.
The knob controls the output sound volume of the speaker and headphones. You
can adjust to an appropriate output sound volume without distortionless sound
quality. If you need to use headphones to monitor the output, it is
recommended to turn the knob left to the lowest sound volume, and then insert
the headphones to avoid damage to your hearing due to too loud sound.
After inserting the headphone, the speaker output will be automatically cut
off.
3.2.5 NR noise reduction adjustment
This knob controls the NR noise reduction switch, and the 200-level noise
reduction degree. Turn left to the end to turn off the NR. Turn to the right
to turn on NR noise reduction and increase the noise reduction degree by
levels.
NR noise reduction will cause slight volume loss, so please reasonably
adjust the noise reduction degree to get a comfortable listening experienc
e.
3.2.6 Adjustment of the digital filter.
The digital filter can be adjusted by L and R, indicating the L-CUT low cut
and H-CUT high cut adjustment. Turn the L knob left to the end, and the L-CUT
low cut will be turned off. Turn the H knob right to the end, and the H-CUT
high cut will be turned off.
Schematic Diagram of Filter Composition:
As shown in the figure on the right, the filter consists of L-CUT and
H-CUT, and both work together to form an effective filter bandwidth. L-CUT
controls the low boundary frequency, which can effectively cut off the low-
frequency component;
H-CUT controls the low boundary frequency, which can effectively cut off the
high-frequency component;
In daily use, adjust according to your own listening preferences, subject to
getting the best listening effect.
*Note: If the actual bandwidth of the filter is less than the useful
bandwidth of the useful signal,
Service/After-sales email:
cuftsetorm@cqxiegu.icom
tech-csquxpipe@guc.com
Tel.: 0769-86346464
Address:
5th Floor, Building C, Futai Hi-Tech Park, No.8 Qingfeng South Road,
Keyuancheng, Tangxia Town, Dongguan City, Guangdong Province
www.cqxiegu.com
References
Read User Manual Online (PDF format)
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