Compatible single-sideband system

• US 3,212,008 A
• Filed: 06/14/1961
• Issued: 10/12/1965
• Est. Priority Date: 06/14/1961
• Status: Expired due to Term

• Current Assignee: Leonard R. Kahn
• Original Assignee: Leonard R. Kahn
• Inventors: Kahn, Leonard R.
• Application Number:
  US04/117,143
• Time in Patent Office: 1,581 Days
• US Class Current: 455/109
• CPC Class Codes: H03C 1/60 with one sideband wholly or partially suppressed
• CPC Class Codes: H03F 1/0294 using vector summing of two or more constant amplitude phase-modulated signals

Claims

9. A RADIO TRANSMITTER FOR TRANSMITTING AN AUDIO FREQUENCY MODULATED COMPATIBLE SINGLE-SIDEBAND WAVE FOR RECEPTION BY EITHER SINGLE-DSIDEBAND OR DOUBLE-SIDEBAND RECEIVERS;

SAID TRANSMITTER COMPRISING MEANS GENERATING AN AUDIO FREQUENCY INPUT SIGNAL, MEANS GENERATING FROM THE AUDIO FREQUENCY INPUT SIGNAL A TWO-TONE SINGLE SIDEBAND WAVE, MEANS DEVELOPING FROM A PORTION OF THE TWOTONE SINGLE-SIDEBAND WAVE A PHASE MODULATED WAVE WHEREIN THE PHASE MODULATION DEVIATIONS ARE ACCENTUATED TO BE NON-LINEARLY GREATER AT HIGHER MODULATION LEVELS THAN AT LOWER MODULATION LEVELS AS COMPARED WITH THE PHASE MODULATION DEVIATIONS OF THE TWO-TONE SINGLE-SIDEBAND WAVE AT CORRESPONDING MODULATION LEVELS, MEANS LIMITING THE RESULTING PHASE MODULATED WAVE, MEANS DERIVING A MODULATING AUDIO FREQUENCY SIGNAL CONTAINING SUBSTANTIALLY ONLY COMPONENTS PRESENT IN THE AUDIO FREQUENCY INPUT SIGNAL, AND MEANS AMPLITUDE MODULATING THE ACCENTUATED PHASE MODULATED WAVE WITH SUCH MODULATING AUDIO FREQUENCY SIGNAL.