Loudspeaker with transmitter
View Patent ↗A speaker device includes an electroacoustic transducer configured to convert an audio signal into a set of sound waves and a transmitter configured to transmit an electromagnetic signal that carries the audio signal for receipt at distances limited to an audibility range of the set of sound waves. The audibility range of the set of sound waves corresponds to a distance at which the set of sound waves is estimated to be below a predetermined sound level.
1. A speaker device comprising:
an electroacoustic transducer configured to convert an audio signal into a set of sound waves; and
a transmitter configured to transmit an electromagnetic signal that carries the audio signal for receipt at distances limited to an audibility range of the set of sound waves.
2. The speaker device of claim 1 , further comprising:
a connector configured to receive the audio signal through one or more conductors coupled to the connector; and
circuitry, coupled to the connector and the transmitter, configured to extract electrical power from the audio signal for use by the transmitter.
3. The speaker device of claim 1 , wherein the transmitter is configured to transmit the electromagnetic signal at a power level that results in a predefined attenuated signal level of the electromagnetic signal at the audibility range of the set of sound waves, wherein the audibility range of the set of sound waves corresponds to a distance at which the set of sound waves is estimated to be below a predetermined sound level.
4. The speaker device of claim 3 , wherein the predefined attenuated signal level of the electromagnetic signal is based on a minimum signal level for reception of the electromagnetic signal by a voice-controlled device configured to receive the electromagnetic signal.
5. The speaker device of claim 3 , wherein the predetermined sound level is between 20 dBA and 40 dBA.
6. The speaker device of claim 3 , wherein the audibility range is a predetermined fixed distance.
7. The speaker device of claim 3 , wherein the audibility range is a dynamically calculated based on an amplitude of the audio signal and/or a volume level set for the speaker device.
8. The speaker device of claim 1 , further comprising:
a receiver configured to receive a radio-frequency signal; and
a demodulator configured to demodulate the radio-frequency signal to extract the audio signal.
9. The speaker device of claim 1 , the electromagnetic signal comprising a radio-frequency carrier in an ISM band modulated with the audio signal.
10. The speaker device of claim 1 , the electromagnetic signal comprising a radio-frequency carrier modulated with the audio signal using analog amplitude modulation or digital amplitude shift keying.
11. The speaker device of claim 1 , the electromagnetic signal comprising a radio-frequency carrier having a frequency of less than 300 MHz modulated with the audio signal.
12. The speaker device of claim 1 , the transmitter further configured to transmit the electromagnetic signal through a conductor from which the speaker device receives power.
13. A method for use by a speaker device, the method comprising:
obtaining an audio signal;
converting the audio signal into a set of sound waves emitted by the speaker device using an electroacoustic transducer;
generating an electromagnetic signal that carries the audio signal; and
transmitting the electromagnetic signal for receipt by a voice-controlled device that is within an audibility range of the set of sound waves.
14. The method of claim 13 , further comprising:
receiving the audio signal through one or more conductors coupled to a connector of the speaker device;
extracting electrical power from the audio signal; and
providing the extracted electrical power to a transmitter of the electromagnetic signal.
15. The method of claim 13 , further comprising transmitting the electromagnetic signal at a power level that results in a predefined attenuated signal level of the electromagnetic signal at the audibility range of the set of sound waves, wherein the audibility range of the set of sound waves corresponds to a distance at which the set of sound waves is estimated to be below a predetermined sound level.
16. The method of claim 15 , wherein the predefined attenuated signal level of the electromagnetic signal is based on a minimum signal level for reception of the electromagnetic signal by a voice-controlled device configured to receive the electromagnetic signal.
17. The method of claim 15 , wherein the predetermined sound level is between 20 dBA and 40 dBA.
18. The method of claim 15 , wherein the audibility range is a predetermined fixed distance.
19. The method of claim 15 , further comprising dynamically calculating the audibility range based on an amplitude of the audio signal and/or a volume level set for the speaker device.
20. The method of claim 13 , further comprising:
receiving a radio-frequency signal at the speaker device; and
demodulating the radio-frequency signal to extract the audio signal.
21. The method of claim 13 , further comprising modulating a radio-frequency carrier with the audio signal using analog amplitude modulation or digital amplitude shift keying to generate the electromagnetic signal.
22. The method of claim 13 , wherein the electromagnetic signal comprises a radio-frequency carrier in an ISM band modulated with the audio signal.
23. The method of claim 13 , wherein the electromagnetic signal comprises a radio-frequency carrier having a frequency of less than 300 MHz modulated with the audio signal.
24. The method of claim 13 , wherein the electromagnetic signal is transmitted through a conductor from which the speaker device receives power.