Patent ID: 6032028
Filing Date: 2000-02-29
Classification: H03C,H03D

Abstract:
A radio transmitter for a signal representing speech and/or music broadcast information to be angle modulated on a carrier having a frequency at a carrier frequency for the transmitter comprisingplural channels each responsive to a sinusoidal like wave having an angle determined by the amplitude of an analog signal associated with the speech and/or music broadcast information so that the frequency of the wave deviates from a reference value as the amplitude of the analog signal deviates from a reference value, each wave having (a) nominally the same maximum amplitude, and (b) a designed nominal phase difference,a plurality of mixers, each mixer being connected to be responsive to a different one of the sinusoidal like waves and to a different phase of the carrier, each of the mixers deriving a separate mixed output signal, the mixed output signals being linearly coupled together to derive an angle modulated output wave having a carrier at the carrier frequency, the carrier frequency being angle shifted to a deviation angle by the speech and/or music broadcast information, the channels, mixers, and circuitry associated with them having a tendency to introduce unwanted components in the output wave; at least one of the amplitude and phase of the sinusoidal like waves being such that at least one of the unwanted components is substantially not present in the output wave.