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MC7240 4-channel full-automatic feedback inhibitor

MC7240Automatic high-speed frequency shift feedback suppressor:Automatic high-speed feed- suppressor use powerful signal processor and combine MCMYK patented algorithm to suppress acoustic feedback occurs.It uses echo cancellation and eliminate reve
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    MC7240 4-channel full-automatic feedback inhibitor

    The MC7240 4-channnel full-automatic high-speed inhibitor uses powerful signal processor and MCMYK patented algorithm to inhibit acoustic feedback. It uses the algorithm of echo offset and echo elimination to eliminate echo within the room effectively to eliminate acoustic feedback. The shielded noise (unheard noise) is added to the output signal, or the frequency of output signal is changed by 5Hz, the MC7240 feedback inhibitor detects components resulting in echo and removes before the feedback, and keeps the initial signal unchanged. Input channel number: 4 channels (4-channel balanced lines/microphone inputs or 4-channel 6.35 non-balanced input). The 48V phantom power switch selection switch is available as power supply for 4 microphones.


    Characteristics and advantages:

    •MCMYK patented feedback inhibition algorithm

    •Naturally eliminating feedback

    •Automatically adaptable to acoustic environment

    •Up to 12dB additional gain to prevent feedback effectively

    •4-channel balanced line or microphone input completed with phantom power supply

    •The self-adaptable filter is switched between “swift mode” and “precise mode”.

    The swift mode is applicable to situations with frequently changed locations of microphones:

    For instance, in the discussion system installed with many conversion microphones, the precise mode is applicable to situations with fixed locations of microphones.

    For instance, in the rostrum with relatively complicated acoustic environment,

    The self-adaptable filter constraints at relatively lower speed to inhibit more echo components.

    Before acoustic feedback, additional up to 12dB gain is obtained subject to acoustic environment and the selected operating modes.

    The MC7240 feedback inhibitor is built-in automatic mixer for 4-line microphone input.

    Under many situations such as speaking stage, rostrum or conference table, use of 4 microphones captures voice from walking lecturers, thus risk of acoustic feedback is increased.

    In terms of this issue, the automatic mixer in the MCMYK feedback inhibitor automatically decreases the gain of the microphone with weak input and increases the gain of the microphone with strong signal input.


    Technical characteristics

    1. Ultra-wide frequency response circuit technology, without inflexion and metallic final sound and powerfully inhibiting echo.

    2. Digital frequency shifting technology powerfully prevents whistling and produces mellow and full, and stable sound, without unstable and dry sound.

    3. Super-stable: built-in crystal oscillation, software algorithm and excellent stability, slightly affected by temperature and external environment.

    4. Appropriate audio spectrum is tailored based on applications to enhance system gain significantly.

    The MC7220 full-automatic frequency shifting feedback inhibitor cooperates with MCMYK microphones and does not whistle and cause inflexion with

    pickup distance from 50CM to 100CM when dozens of microphones turned on within one conference site.




    MC7240 4-channel full-automatic feedback inhibitor


    Specifications and parameters

    Input channel number:

    4 channels (4-channel balance input or 4-channel 6.35 non-channel input)

    Power supply voltage:4-channel 48V phantom power supply
    Rated voltage : 220V±10% 50Hz
    Sampling rate:32KHz
    Frequency response:

    125Hz~15KHz(voice mode)

    20Hz~15KHz (music mode)

    Distortion :>0.1%@ 1KHz
    SNR: >90dB
    Signal delay :

    7Ms(music mode)

    11MS(voice mode)

    Input impedance:20K ohm
    Output impedance: (balanced) 200ohm
    Range of temperature: -10~55℃
    Wight : 2.5KG
    Dimensions:482×212×44mm


    MC7240 4-channel full-automatic feedback inhibitor


    MC7240 4-channel full-automatic feedback inhibitor dimension figure