![]() ![]() Though the fundamentals of audio science remain the same, the technology for creating and analyzing recordings continues to advance. These range from personal digital recorders to sophisticated law enforcement only covert audio and video systems, as well as surveillance systems that also record audio. Though analog tapes may still be seen occasionally, over the past several years, the use of analog recorders has been replaced by digital recorders and systems. These recordings were on cassette tapes, micro cassette tapes, VHS tapes, etc. The technology of yesteryear’s audio and video recordings was analog. The information in this article will assist you in achieving a better understanding of recorded evidence and how “looking beyond the obvious,” will be of great value in dealing with cases involving audio & video recordings as well as evidence images in both criminal and civil investigations. Audio or video is frequently recorded on Smartphones by people involved in an incident or people simply in the area. The use of covert audio/video recording devices by law enforcement both in the field and interview rooms is almost standard practice. In fact, most police cars use dash cam video recorders which record both audio and video. Stores, businesses and even city streets are equipped with surveillance video systems. My thread initial problem was that I couldn’t see visually if and where clipping occurred.Īttached screenshot Audacity peak meter was close to 0 dB and obviously crossed it few times.In this era, the use of recording devices is everywhere. ![]() Different cassette’s sound level varies 5-10 dB and I start recording without preliminary check and restart when level fix is required. This clipping screenshot is result of setting Audacity recording level too high. ![]() Ether way, lowering the recording level a little should prevent the distortion. …Maybe a “cheap soundcard” or maybe the output of your cassette player is clipping. I think that on my screenshot there is a typical cut off peak or am I wrong?> Yes, that looks like clipping > but it’s probably something on the analog side clipping just-before you get digital clipping. And if it’s worth extra time in this 90’s German radio station archiving project. Thanks, somehow I considered normalize function as flattening sound levels of all track. I assume you do see red if you run the Amplify effect, allow clipping, and boost by +3dB or so? …Just making sure Audacity is behaving as-expected. Or, it’s possible that the positive peaks are clipped by the analog hardware (like what we’re seeing) but negative peaks are only clipped by the ADC. What happens if you TRY to get clipping? Do you “see red” in the waveform? If the analog clips before the ADC clips you’ll never see red. ![]() Yes, that looks like clipping but it’s probably something on the analog side clipping just-before you get digital clipping. I think that on my screenshot there is a typical cut off peak or am I wrong? BTW - Thanks for posting the image or we’d be going-around in circles.ĭigitizing old cassettes I wish to convert audio at maximum level without clipping.īad plan!!! Leave headroom and run the Amplify or Normalize effect later to maximize the volume. ![]()
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