"The question was posed after a discussion on phase problems that develop when music is recorded with many microphones and passed through and processes by many digital boxes.
A drawing of the stylus in a record groove showed how the right and left channels are reproduced by left and right movement of the stylus. There is another movement of the stylus, vertical, that is the component of phase relationships. That movement doesn't have an effect on the left and right channels but is noticed on a tape recording and adds air that gives the music an effect that won't come across on an LP."
Seems to me the 1st paragraph is unrelated to the 2nd.
The 1st is talking about recording musical components out of phase because of relative distances of the recording mics and time delays in various processors. The end result being the music that is put to tape or to vinyl or to CD does not have the original phase relationships of the components as produced by the musicians.
The 2nd paragraph is talking about the phase between left and right channels. This phase difference would be there regardless of the recording media. And frankly, I have no idea what the vertical movement bit is trying to say in the 2nd paragraph. Pure vertical movement of a stylus simply means that both the left and right channels are in phase, i.e., a mono signal. Any movement other than vertical means that there are out of pphase signals, i.e., stereo.
A drawing of the stylus in a record groove showed how the right and left channels are reproduced by left and right movement of the stylus. There is another movement of the stylus, vertical, that is the component of phase relationships. That movement doesn't have an effect on the left and right channels but is noticed on a tape recording and adds air that gives the music an effect that won't come across on an LP."
Seems to me the 1st paragraph is unrelated to the 2nd.
The 1st is talking about recording musical components out of phase because of relative distances of the recording mics and time delays in various processors. The end result being the music that is put to tape or to vinyl or to CD does not have the original phase relationships of the components as produced by the musicians.
The 2nd paragraph is talking about the phase between left and right channels. This phase difference would be there regardless of the recording media. And frankly, I have no idea what the vertical movement bit is trying to say in the 2nd paragraph. Pure vertical movement of a stylus simply means that both the left and right channels are in phase, i.e., a mono signal. Any movement other than vertical means that there are out of pphase signals, i.e., stereo.