jp123

Hi I was hoping someone may be able to help with an audio feedback problem on a CCTV system I have. There is a Hikvision camera (DS-2CD2655FWD-IZS) which has a microphone connected to an audio input. The camera then has a horn speaker connected to an audio output. The camera is then wired back to a Hikvision NVR. The sound from the Mic works fine when the speaker isn't being used. As soon as the push to talk function on the IVMS-4200 app is used a lot of feedback happens through the Mic. The app doesn't have an audio cutoff for the microphone built into it when you use the talkback functions. I have used functions in the camera for echo noise cancellation and tried adjusting microphone levels in the camera. Currently, the speaker is about 5 meters away from the mic and have been trying to come up with a way to reduce the feedback on the microphone without massive loss of quality. Ideally, the speaker isn't wanting to be moved so if anyone has any thoughts on how I can get around this.