A-800 frequency shifter

Four channel automatic high-speed feedback suppressor uses powerful signal processor and BaDun patent algorithm to suppress the occurrence of acoustic feedback. It adopts the algorithm of echo cancellation and reverberation elimination to effectively filter out room reverberation, so as to achieve the purpose of eliminating acoustic feedback. By adding shielding noise (inaudible noise) to the output signal, or changing the frequency of the output signal by 5 Hz, the feedback suppressor can detect the component of the signal that causes reverberation, remove it before the feedback occurs, and keep the initial signal intact. Number of input channels: 4 channels (4-channel balanced line / microphone input or 4-channel 6.35 unbalanced input). Provide 48V phantom power switch selection module, which can provide power for 4 microphones
Features and benefits:
• BaDun patented feedback suppression algorithm
• eliminate feedback
Automatic adaptation to acoustic environment
• up to 12 dB additional gain to prevent feedback
• 4-channel balanced line or microphone input for phantom power
• adaptive filters can switch between "fast" and "accurate" modes.
Fast mode is suitable for situations where microphone position changes frequently:
For example, in a discussion system with multiple converted microphones. Precise mode is suitable for fixed microphone position.
For example, the acoustic environment is more complex.
The adaptive filter can converge at a slower rate, thus suppressing more reverberation components.
Before the acoustic feedback occurs, an additional gain of up to 12dB can be obtained, depending on the acoustic environment and the selected mode of operation.
The feedback suppressor also has a built-in automatic mixer for 4 microphone inputs.
In many cases, such as on a podium, podium or conference table, the use of four microphones can better capture the voice of a moving speaker, which often increases the risk of acoustic feedback.
In view of this problem, the automatic mixer in the BaDun feedback suppressor will automatically reduce the gain of the microphone with the weaker signal input and increase the gain of the microphone with the stronger signal input.
Technical features
1. Ultra wide frequency response circuit technology, no voice change, no metal tail sound, strong echo suppression.
2. Digital frequency shift technology, super strong anti screaming, smooth and stable sound, no floating and dry hair and other phenomena.
3. Super stability: built in crystal oscillation, software algorithm, good stability, little interference by temperature and outside.
4. The appropriate audio frequency spectrum can be customized according to the application situation, so as to greatly improve the system gain.
5. The equipment has adjustable high and low background sound
Fully automatic high-speed frequency shift feedback suppressor with any model of BaDun microphone can achieve a pickup of 50cm to 100cm without constant chirp when dozens of microphones are opened at the same meeting place at the same time.
Technical parameters:
Number of input channels: 4 channels (4 channels balanced input or 4 channels 6.35 unbalanced input selected)
Power supply voltage: 4-channel 48V phantom power supply
Rated voltage: 220V ± 10% 50Hz
Sampling frequency: 32kHz
Frequency response: 125Hz ~ 15KHz (voice mode)
20Hz ~ 15KHz (music mode)
Distortion: > 0.1% @ 1kHz
Signal to noise ratio: > 90dB
Signal delay: 7ms (music mode)
11ms (voice mode)
Input impedance: 20K ohm
Output impedance: (balanced) 200Ohm
Temperature range: - 10 ~ 55 ℃
Weight: 2.5kg
Size: 480 × 220 × 44mm