112 BELL SYSTEM TECHNICAL JOURNAL 



For asynchronous reception, then, just as for the case of a local 

 carrier displaced in phase, single side-band transmission is preferable 

 for telephony and double side-band for telegraphy. The difficulties 

 are of the same general nature in the two cases, but with the asynchron- 

 ous carrier they are considerably greater. This is in agreement with 

 the idea expressed above, that lack of synchronism may be looked 

 upon as an aggravated case of phase displacement. 



