Stereo disc recording



There are two possibilities to modulate a groove:
Simplified presentation


Vertical
Modulation

vertical modulation


 Stereo Groove

verticale modulation

vertical modulation

&

Horizontal Modulation

horizontal modulation

 Mono Groove

horizontale modulation

horizontal modulation



Both modulations together:



Two
Channels

stereo modulation

 Stereo Groove

both channels

2 channels


But:
Horizontal modulation is better than vertical !

Vertical modulation:

More distortion !
Large amplitudes, not possible !

One channel always would be better !


The compromise:



All gets turned 45°

2 channels, 1 groove




Each channel half vertical, half horizontal !
A compromise


Right ChannelCutterhead topCutterhead left channelright channalCutterhead right channel
 Right Channel Groove

right channel

right channel





Left ChannelCutterhead topCutterhead left channelleft channelCutterhead right channel
 Left Channel Groove

left channel

left channel





MonoCutterhead topCutterhead left channelMonoCutterhead right channel
 Mono Groove

mono

mono





StereoCutterhead topCutterhead left channelStereoCutterhead right channel
 Stereo Groove

stereo

stereo





Maximum Stereo or
Mono and 1 channel 180° phased
Cutterhead topCutterhead left channelExtremest Stereo: Mono 180° phasedCutterhead right channel
 Stereo Groove

mono 180 phased

mono 180 phased


Be careful with such a signal !
Stylus could loose contact with the blank !
Groove would disappear !


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