Full automatic professional conference feedback suppressor (four in and one out)

AVA-8740

Introduction:

It adopts echo cancellation and reverberation elimination algorithms 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 5Hz, the feedback suppressor can detect the components causing reverberation in the signal and remove them before the feedback occurs, while keeping the initial signal intact. Number of input channels: 4 channels (4-channel balanced line / short input, 4-channel 6.35 unbalanced input), providing 48V phantom power supply switch selection module, which can provide power for 4 microphones.

Features and benefits:

1. With LCD screen, it can visually display the frequency spectrum and working state of audio at that time.

2. Eliminate feedback

3. Automatically adapt to the acoustic environment

4. Up to 12dB additional gain to effectively prevent feedback

5.4 channel balanced line or microphone input to provide phantom power

6. The adaptive filter can switch between "fast" mode and "accurate" mode.

7. The quick mode is suitable for situations where the position of the short message changes frequently:

For example, in a discussion system with multiple conversion microphones.

The precise mode is applicable to situations where the speech brief position is fixed:

For example, a pulpit with complex acoustic environment.

The adaptive filter can converge at a slower speed, so as to suppress more reverberation components.

8. An additional gain of up to 12dB can be obtained before acoustic feedback occurs, depending on the acoustic environment and the selected operation mode.

9. Built in automatic mixer to realize 4-way brief input.

In many cases, such as on the podium, podium or conference table, the use of four briefs can better capture the voice of the moving speaker. This often increases the risk of acoustic feedback. In view of this problem, the automatic mixer in the feedback suppressor will automatically reduce the gain of the microphone with weak signal input and increase the gain of another short with strong signal input

Technical features:

1. Ultra wide frequency response circuit search, no sound change, no metal tail, strong echo suppression.

2. Digital frequency shift technology, super anti whistling, smooth and stable sound, no floating and dry hair and other phenomena.

3. Super stable, built-in crystal swing, software algorithm, good stability, little affected by temperature and external interference.

4. The appropriate audio spectrum can be customized according to the application, so as to greatly improve the system gain.

Technical parameters:

Number of input channels: 4 channels (4-channel balanced input or select 4-channel 6.35 unbalanced input)

Power supply voltage: 4-channel 48V phantom power supply

Rated voltage: 220V ± 10% 50Hz

Sampling frequency: 48Khz

Frequency response: 125Hz ~ 15KHz (voice mode) 20Hz ~ 15khx (music mode)

Distortion: > 0.1% @ 1kHz

SNR: > 90dB

Signal delay: 7ms (music mode) 11ms (voice mode)

Input impedance: 20K ohm

Output impedance: (balanced) 200Ohm

Temperature range: - 10 ~ 55 ℃

Weight: 3.2kg

Size: 480x220x44mm

Peripherals