Method of demodulation of a stereophonic signal
AssigneesContinental Automotive France, Continental Automotive GmbH
InventorGérald Soulier
Life of this patent
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Abstract
A method for demodulating a multiplexed stereophonic signal, the signal including a signal called the sum signal, a signal called the difference signal, and a pilot signal, the method including the following steps: removing the pilot frequency from the multiplexed stereophonic signal, the resulting signal being called the pilotless signal, and subtracting the sum signal from the pilotless signal.
Claims13
A method for demodulating a multiplexed stereophonic signal, the signal comprising:
- a sum signal, which is a sum of two monophonic signals,
- a difference signal, which is a difference of said two monophonic signals, and
- a pilot signal at a pilot frequency serving as a reference for performing a frequency transposition of the difference signal on the basis of a carrier signal, the method comprising:
- removing the pilot frequency from the multiplexed stereophonic signal, to form a pilotless signal comprising the sum signal and the difference signal;
- and
- subtracting the sum signal from the pilotless signal, to form an untransposed difference signal.
A method for demodulating a multiplexed stereophonic signal, the signal comprising:
- a sum signal, which is a sum of two monophonic signals,
- a difference signal, which is a difference of said two monophonic signals, and
- a pilot signal at a pilot frequency serving as a reference for performing a frequency transposition of the difference signal on the basis of a carrier signal, the method comprising:
- removing the pilot frequency from the multiplexed stereophonic signal, to form a pilotless signal;
- and
- subtracting the sum signal from the pilotless signal, to form an untransposed difference signal,
- wherein the step of regenerating the carrier signal comprises a subtraction step in which the pilotless signal is subtracted from the multiplexed stereophonic signal, the subtraction step being followed by a step of applying a delay.
A method for demodulating a multiplexed stereophonic signal, the signal comprising:
- a sum signal, which is a sum of two monophonic signals,
- a difference signal, which is a difference of said two monophonic signals, and
- a pilot signal at a pilot frequency serving as a reference for performing a frequency transposition of the difference signal on the basis of a carrier signal, the method comprising:
- removing the pilot frequency from the multiplexed stereophonic signal, to form a pilotless signal;
- subtracting the sum signal from the pilotless signal, to form an untransposed difference signal;
- and,
- filtering by a low-pass filter prior to the step of subtracting the pilotless signal from the sum signal.
Dependencies are inferred from the claim text.