Search found 6 matches

by RobH_Lab
Thu May 05, 2011 8:19 am
Forum: Windows
Topic: Signal to Noise Ratios / Intensity Normalisation
Replies: 12
Views: 5208

Re: Signal to Noise Ratios / Intensity Normalisation

Is there anyway of editing this code so that it sets the mean RMS level of a track to the specified value? For the "words" recording, it is a bit more complicated. Lets say that you have one track that is a recording of someone quietly saying: "mumble mumble mumble whisper whisper mumble mumble mum...
by RobH_Lab
Wed May 04, 2011 12:45 pm
Forum: Windows
Topic: Signal to Noise Ratios / Intensity Normalisation
Replies: 12
Views: 5208

Re: Signal to Noise Ratios / Intensity Normalisation

If you run the following code in the "Nyquist Prompt" (in the Effect menu), it will amplify the selection so that the first 1 second has a peak RMS level of -12 dBFS. (only works with mono tracks). (setq target-level -12) (mult s (/ (db-to-linear target-level)(peak (rms s) 100))) If you require a d...
by RobH_Lab
Sun May 01, 2011 10:17 am
Forum: Windows
Topic: Signal to Noise Ratios / Intensity Normalisation
Replies: 12
Views: 5208

Re: Signal to Noise Ratios / Intensity Normalisation

Hi I tried the code, by splitting my audio tracks to mono. It seems to have worked for most of the word stimuli, apart from a couple which didn't seem to change at all and (subjectively) seem a bit quieter than the rest - however that is probably due to the pattern of lexical stress on those words s...
by RobH_Lab
Thu Apr 28, 2011 3:47 pm
Forum: Windows
Topic: Signal to Noise Ratios / Intensity Normalisation
Replies: 12
Views: 5208

Re: Signal to Noise Ratios / Intensity Normalisation

All the relevant literature is vague - most don't even specify the signal to noise ratio or even the software they used to create the stimuli!. Basically what I want is to try and ensure that all the stimuli that we subject the participant to are the same 'loudness'. As percieved loudness is subject...
by RobH_Lab
Thu Apr 28, 2011 12:07 pm
Forum: Windows
Topic: Signal to Noise Ratios / Intensity Normalisation
Replies: 12
Views: 5208

Re: Signal to Noise Ratios / Intensity Normalisation

The study I'm trying to replicate says this: In addition, all sound stimuli were normalized to the same decibel level, such that all ‘‘noise-word’’ and ‘‘noise-alone’’ stimuli were matched on sound level. I need an objective measure of loudness - I assume sound pressure measured in decibels would su...
by RobH_Lab
Thu Apr 28, 2011 8:37 am
Forum: Windows
Topic: Signal to Noise Ratios / Intensity Normalisation
Replies: 12
Views: 5208

Signal to Noise Ratios / Intensity Normalisation

Hi, hope this is the correct forum for this sort of question. I'm looking at producing some stimuli for an experiment on auditory processing. Each stimulus will be a spoken word which is masked by white noise. To this end I have recorded separate .wav files contain various spoken words, and I have a...