No announcement yet.

Echo in room problem

  • Time
  • Show
Clear All
new posts

  • Echo in room problem

    How does one eliminate echo from being in a large conference room? I have Edius 6.08. Thanks.

    Windows 10 Home 64 Bit, Edius WG 9.55.7303, Edius X WG 10.20.7490 Intel Z370X Motherboard, i7-8700K 4.7 GHz 6 core, 12 Thread LGA-1151 CPU, GTX-1080 8GB Graphics card, 500GB M.2 PCIe NVM SSD, 16 TB Raid 0 Media Drive, 32 GB DDR4 Memory, Intensity Pro 4K AV I/O, CS 5.51 Production Suite.

  • #2
    Correct placement of mics.
    Echo is difficult to remove in post.


    • #3
      There is no substitute for getting a good audio recording in the first place. The usual answer is to use close mics (head mics) and get a feed off the audio desk into an audio recorder and sync it up afterwards, that avoids most problems.

      If that was impossible for whatever reason, then the clips can be overdubbed with the voices afterwards, but if it was ad lib speech then there needs to be a transcript produced and the speakers need to come back and record voice over to the transcript (used in film where the location audio is difficult).

      However if that is impossible too, and you are stuck with an audio track with echo it is very difficult to deal with, and of course detracts from the clarity of the speech.

      In rooms with large flat reflective surfaces such as floors and walls there will be not only a room resonance but also an echo.

      Room resonance can be improved by adding a parametric equaliser filter and by pulling down the nodes on the 0dB line reduce the volume (notch) with a reasonable Q set. By moving the notch frequency you can find the spots that improve the sound clarity or hollowness.

      Echo is a different matter being a delayed repeat of the original sound at a lower volume than the original. Effectively you need to know what the delay is and add audio back in in the opposite phase to cancel it out. Unless you accurately know the original characteristics of the room delay it remains a virtually impossible task.

      Bearing in mind that an echo is a lower volume repeat you could try a sound gate but it might not help.

      More reading here.

      And one piece of software;

      Sorry it isn't good news, it is a really hard problem to solve in post.

      Sys4: Edius9/XWG ASUS Z10PE-D16WS MB 2xE5-2696 Xeon 72 cores. 16TB RAID0 64G RAM RTX3090Ti. Samsung 55" QLED 1500 NIT HDR 4K TV. Storm3G Elite/Decklink 4K 12G HDR. Yamaha RX-A870 A/V 7.1 audio. Sys1-3 Edius 8.5 WG + RX-E1+HDBX1000 MIP HP xw8600 2 x X5492 CPU 8 cores, 8G RAM, GTX1080TI. All sys Fibred to central media pool - 5TB RAID + QLogic Fibre Switch. Central SD Pro VCR rack. All sys YUV & audio to theatre with Sony STR DN1040 7.1 audio amp with 1000W sub 63" HD 3D Samsung TV


      • #4
        There is software (plug-ins) that claims to be able to reduce reverberation. Whether or not it will help you is an open question. My may be able to download demo versions of some.

        iZotope RX3, Zynaptic Unveil, and De-Verb by SPL are three products you might want to check. for a review of them.
        I believe there are other products as well.

        As noted by others, there is no substitute for good mic placement.


        • #5
          read my blog here:

          REMOVING ECHO FROM AUDIO Before you think this is going to cure all those nasty echo problems, it won't, but it may get you out o...

          it may help you out, but as suggested, there's no real fix..

          Paul :-)
          Edius Edits at:

          1) AMD 3900X 12 core 4.6Ghz 2) Asus X79 4930K 6 core @4.4GHz Water Cooled. 480GB REVO3x2 System drive, 4TB Raid 0, 4 TB E-Sata Raid 5, 32GB RAM, GTX1070Ti Decklink HD Extreme. 3X Sony AX53 Sony AX700 BMPCC 4K