Wireless remote speaker system
First Claim
1. A device for receiving stereophonic FM signals, including at least two different carrier frequencies modulated with stereophonic audio information, from AC power lines and for converting the frequency modulated carrier frequency signals to stereophonic audio signals comprisinginput means coupled to said AC power lines for receiving FM signals;
- first and second stereophonic demodulating channels, each channel including;
band-pass notch filter means coupled to said input means for passing one of said carrier frequencies, rejecting the other carrier frequency and filtering out noise on said AC power lines;
amplifier means coupled to said band-pass/notch filter means for amplifying the passed frequency modulated carrier signal; and
demodulating means coupled to said amplifier means for demodulating the passed frequency modulated carrier signal to produce a respective one of said stereophonic audio signals therefrom; and
output means coupled to the demodulating means of both channels for outputting said stereophonic audio signals.
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Accused Products
Abstract
A device comprised of separate transmitter and receiver sections, which converts an audio signal into an FM signal, transmits the FM signal over AC power lines, and reconverts the FM signal into an audio signal, which can then be outputted to loudspeakers or other devices. By transmitting the signal over AC lines, no long wires are needed to connect remote loudspeakers or other devices to the source of the audio signal.
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Citations
10 Claims
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1. A device for receiving stereophonic FM signals, including at least two different carrier frequencies modulated with stereophonic audio information, from AC power lines and for converting the frequency modulated carrier frequency signals to stereophonic audio signals comprising
input means coupled to said AC power lines for receiving FM signals; -
first and second stereophonic demodulating channels, each channel including; band-pass notch filter means coupled to said input means for passing one of said carrier frequencies, rejecting the other carrier frequency and filtering out noise on said AC power lines; amplifier means coupled to said band-pass/notch filter means for amplifying the passed frequency modulated carrier signal; and demodulating means coupled to said amplifier means for demodulating the passed frequency modulated carrier signal to produce a respective one of said stereophonic audio signals therefrom; and output means coupled to the demodulating means of both channels for outputting said stereophonic audio signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An FM communications system comprising a device for transmitting stereophonic audio signals over an AC power line comprising input means for providing stereophonic audio signals;
- first and second signal processing channels, each comprising;
input buffer means coupled to said input means for amplifying a respective one of said stereophonic audio signals;
modulation means responsive to said input buffer means for frequency modulating a respective carrier with a respective one of said stereophonic audio signals to produce an FM carrier signal; and
filter means coupled to said modulation means and tuned to the frequency of said respective carrier frequency for removing unwanted frequency components in said FM carrier signal and for coupling said FM carrier signal to said AC power line;
an AC power line coupled to said filter means of both channels for carrying said FM carrier signals; and
a device coupled to said AC power line for receiving FM carrier signals from AC power lines and for converting FM carrier signals to stereophonic audio signals comprising input means coupled to said AC power lines for receiving FM carrier signals;
first and second band-pass/notch filter means coupled to said input means for passing respective ones of the FM carrier signals and for rejecting the other of the respective FM carrier signals and for filtering out undesired noise on the AC power line;
first and second amplifier means coupled to said first and second filter means, respectively, for amplifying the respectively passed FM carrier signals;
first and second demodulating means coupled to said first and second amplifier means, respectively, for demodulating the passed FM carrier signals to produce first and second stereophonic audio signals;
first and second impulse noise cancellation means coupled to the first and second demodulating means, respectively, to remove impulse noise that may be present in the demodulated stereophonic audio signals; and
output means coupled to said first and second impulse noise cancellation means for outputting said stereophonic audio signals. - View Dependent Claims (10)
- first and second signal processing channels, each comprising;
Specification