Data delivery using acoustic transmissions
Systems, methods, and computer program products for delivering information to an individual, group, or device. The information is carried by audio signals beyond the audible frequency range of human hearing, but within the frequency range of an audio system. The information is modulated onto an ultrasonic frequency and embedded into an audio signal transmitted by the audio system. Each individual, group member, or device may have or be coupled to a receiver configured to receive an acoustic signal transmitted by the audio system that includes the modulated ultrasonic frequency. The receiver extracts the information from the modulated ultrasonic frequency and provides the information to the individual, group member, or device.
1. An apparatus comprising a device configured to:
generate a first signal by modulating a transmitter carrier frequency using a sequence of signals including a pilot sequence;
transmit a second signal including the first signal, wherein the second signal is an acoustic signal.
2. The apparatus of claim 1 wherein the device is further configured to: apply a filter to the first signal to limit an effective bandwidth of the second signal.
3. The apparatus of claim 1 further comprising the device, wherein the device is configured to:
receive the acoustic signal from an audio system that includes the second signal;
extract a sequence of symbols from the second signal; and
use the pilot sequence for one or more of synchronization, determining a frequency mismatch, determining a phase mismatch, or to characterize a channel.
4. The apparatus of claim 1 wherein the acoustic signal is in an acoustic band, and wherein the acoustic band consists of frequencies beyond an audible range of human hearing, but within a range of frequencies that can be transmitted by an audio system.
5. The apparatus of claim 1 further comprising the device, wherein the device is configured to:
receive the acoustic signal from an audio system that includes the second signal;
extract the first signal from the second signal; and
provide the first signal to a user of the device.
6. The apparatus of claim 5 wherein extracting the first signal from the second signal includes detecting a frame of the first signal, and the device is further configured to activate audio circuitry in response to detecting the frame.
7. The apparatus of claim 1 wherein the apparatus is configured to transmit the acoustic signal to an area, and wherein the area is a space proximate to a vehicle, and the first signal is received from a data source associated with the vehicle.
8. The apparatus of claim 7 wherein the device is configured to display information related to a condition of the vehicle based on the first signal.
9. The apparatus of claim 1 further comprising the device, wherein the device is coupled to a controller and configured to provide the first signal to the controller.
10. The apparatus of claim 1 wherein the first signal includes metadata related to an audio signal being transmitted by an audio system, and the device is configured to display the metadata.
11. The apparatus of claim 1 wherein the first signal includes a plurality of frames, the pilot sequence includes a plurality of pilot symbols, and the device is configured to:
add the pilot sequence to the sequence of symbols by inserting a pilot symbol into each frame of the first signal to form data packets.
12. The apparatus of claim 11 wherein the pilot symbol is inserted as a header of the frame.
13. The apparatus of claim 11 wherein the device is configured to map the first signal to a set of symbols to generate the sequence of symbols corresponding to the first signal by mapping each data packet to one or more symbols of the sequence of symbols.
14. A method comprising:
generating a first signal by modulating a transmitter carrier frequency using a sequence of signals including a pilot sequence;
transmitting a second signal including the first signal, wherein the second signal is an acoustic signal.
15. The method of claim 14 wherein the acoustic signal is in an acoustic band, and wherein the acoustic band consists of frequencies beyond an audible range of human hearing, but within a range of frequencies that can be transmitted by an audio system.
16. The method of claim 14 further comprising:
receiving the acoustic signal from an audio system that includes the second signal at a user device;
extracting the first signal from the second signal; and
providing the first signal to a user of the user device.
17. The method of claim 16 wherein extracting the first signal from the second signal includes detecting a frame of the first signal, and the user device is further configured to activate audio circuitry in response to detecting the frame.
18. The method of claim 14 further comprising transmitting the acoustic signal to an area, wherein the area is a space proximate to a vehicle and the first signal is received from a data source associated with the vehicle, and further comprising displaying information related to a condition of the vehicle based on the first signal.
19. The method of claim 14 further comprising:
receiving the acoustic signal from an audio system that includes the second signal at a receiver;
extracting the first signal from the second signal; and
transmitting the first signal to a controller.
20. A computer program product comprising:
a non-transitory computer-readable storage medium; and
program code stored on the non-transitory computer-readable storage medium that, when executed by one or more processors, causes the one or more processors to:
generate a first signal by modulating a transmitter carrier frequency using a sequence of signals including a pilot sequence;
transmit a second signal including the first signal, wherein the second signal is an acoustic signal.