Hi Rick, > The experience of singing through a telephone would be dramatically > impacted by the choice of scale. If frequencies are rounded off to > the nearest match on a linear scale, then they are bound to be off-pitch. > On the other hand, if musical halftones (or perhaps halfway these) were > used as a rounded value, then Codec2 would pass musical tones at the > perfect pitch -- the roundoff could actually improve the song ;-)
I feel you are into something here. From what I believe, it is not the absolute pitch though (unless you have absolute hearing ?? ) but the relation between various frequencies that is percieved as on key or false. This is often referred to as the reason certain (3-order) distortion in amplifiers is objectionable. (2nd harmonic is in key, 3-d is NOT, 4th is, 5th is not...) > Two subsequent musical halfnotes are a factor of 12'th root of 2 apart, > so 12 such halfnotes make up a factor 2 or an octave. The frequency > 440 Hz is defined as an A. Using step sizes of the 24'th root of 2 > or 1.0293022366434921 should give a comparable experience, but be > friendly to music. It is also slightly more compact. How would this impact the necessary math? Working from sampling, discrete time, what is the "natural" result in frequency? > Am I the only one who would find it a pitty if we missed out on this, > if the only reason would be the existing implementations in the field? I have a sensitive ear to some kinds of distortion, I had severe problems with first generation GSM phones ( good for the economy though, short calls) 73 de Gullik /SM6FBD ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
