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even FM radio is on the way out. Posted by schleierenkraft (from: 207.32.33.85) on October 22, 2002 at 08:25:33: In Reply to: Music de-modulation software posted by Darko Ljubic on October 18, 2002 at 04:03:22: Dear Darko, Demodulation is not what you are talking about. Voices and lyrics and singing are not mixed into a song using modulation, so demodulation will not remove them. Modulation in audio usually means oscilllation. Generally modulation refers to varying the pitch or amplitude or spectre of a sound by using an oscillator, especially an LFO (low frequency oscillator). Low frequency refers to below audible frequencies. A high frequency oscillator would be higher than audible frequencies. Such high frequency modulation is used in certain kinds of dithering, such as UV22. What you are talking about is called vocal cancellation or removal. Often it is attempted by center cancellation or mono channel removal. This is not entirely possible, any device claiming to do this is exaggerating. However, many old-fashioned or plainly-engineered vocals are recorded in plain mono. This means that if you can cancel out the monaural part of the audio, then you can remove the voice. Unfortunately, anymore, most vocals are not recorded in pure mono, and even if they were, mastering and effects and dubbing can change all of that. So really, it's not an easy task. In addition, the only instruments that are still often kept in pure mono are the kick drum, bass guitar, and sometimes snare drum. So, if you cancel out the center mono channel, then you risk killing all of these crucial instruments and any other in-phase elements. The devices that claim to cancel only vocals, do less damage (theoretically) by using EQ. Anyhow, you can get other people's perspective on this by reading the links here at hitsquad about removing vocals. it's the number one question. If you look up demodulation in an electrician's dictionary you will get a much better idea of what modulation really is. trust me, it's not what you think. Follow Ups: Post a Followup Name: E-Mail: Subject: Comments: : Dear Darko, : Demodulation is not what you are talking about. : Voices and lyrics and singing are not mixed into a song using modulation, so demodulation will not remove them. Modulation in audio usually means oscilllation. Generally modulation refers to varying the pitch or amplitude or spectre of a sound by using an oscillator, especially an LFO (low frequency oscillator). Low frequency refers to below audible frequencies. A high frequency oscillator would be higher than audible frequencies. Such high frequency modulation is used in certain kinds of dithering, such as UV22. : What you are talking about is called vocal cancellation or removal. : Often it is attempted by center cancellation or mono channel removal. : This is not entirely possible, any device claiming to do this is exaggerating. : However, many old-fashioned or plainly-engineered vocals are recorded : in plain mono. This means that if you can cancel out the monaural part of the audio, then you can remove the voice. Unfortunately, anymore, most vocals are not recorded in pure mono, and even if they were, mastering and effects and dubbing can change all of that. So really, it's not an easy task. : In addition, the only instruments that are still often kept in pure mono are the kick drum, bass guitar, and sometimes snare drum. So, if you cancel out the center mono channel, then you risk killing all of these crucial instruments and any other in-phase elements. : The devices that claim to cancel only vocals, do less damage (theoretically) by using EQ. : Anyhow, you can get other people's perspective on this by reading the links here at hitsquad about removing vocals. it's the number one question. : If you look up demodulation in an electrician's dictionary you will get : a much better idea of what modulation really is. trust me, it's not what you think. Click here to be notified by email when someone replies to your message [ Follow Ups ] [ Post Followup ] [ Music Software Discussion & Help Page ] [ FAQ ]

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