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



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