Using non-audio data embedded in an audio signal
Embodiments included herein generally relate to using non-audio data embedded in an audio signal. More particularly, embodiments relate to using non-audio data embedded into the audio signal to control an audio configuration of a plurality of speakers and/or to measure a delay of a playback device.
1. A method comprising:
measuring, by a media content device, in response to detecting a wired connection between the media content device and a playback device, a clocking sample from an internal clock of the media content device that stores media content;
encoding the clocking sample to generate a first audio stream;
combining, by the media content device, the first audio stream with a second audio stream to generate a combined audio stream, wherein the second audio stream is the media content;
transmitting, by the media content device, the combined audio stream through the playback device, wherein the combined audio stream includes the media content and is processed by the playback device;
receiving, by the media content device, a returned signal from the playback device, wherein the returned signal includes audio samples;
decoding, by the media content device, the audio samples received from the playback device to extract timestamps of the playback device; and
comparing, by the media content device, the extracted timestamps of the playback device with the clocking sample of the media content device to determine a latency of the playback device.
2. The method of claim 1 , further comprising adjusting a timing of the second audio stream based on the latency of the playback device.
3. The method of claim 1 , wherein the wired connection comprises a high-definition multimedia interface (HDMI) connection or an optical Sony/Philips Digital Interface (S/PDIF) cable.
4. The method of claim 1 , wherein the playback device comprises an audio-visual transceiver.
5. The method of claim 1 , wherein encoding the clocking sample comprises encoding the clocking sample using a frequency shift keying scheme.
6. The method of claim 1 , wherein the first audio stream is generated at a frequency inaudible to humans.
7. The method of claim 1 , wherein the first audio stream is centered at a frequency of about 19.5 Khz.
8. A system comprising:
a memory; and
a processor coupled to the memory and configured to:
measure a clocking sample from an internal clock of a media content device that stores media content in response to detecting a wired connection between the media content device and a playback device;
encode the clocking sample to generate a first audio stream;
combine the first audio stream with a second audio stream to generate a combined audio stream, wherein the second audio stream is the media content;
transmit the combined audio stream through the playback device, wherein the combined audio stream includes the media content and is processed by the playback device;
receive, by the media content device, a returned signal from the playback device, wherein the returned signal includes audio samples;
decode, by the media content device, the audio samples received from the playback device to extract timestamps of the playback device; and
compare, by the media content device, the extracted timestamps of the playback device with the clocking sample of the media content device to determine a latency of the playback device.
9. The system of claim 8 , wherein the processor is further configured to adjust a timing of the second audio stream based on the latency of the playback device.
10. The system of claim 8 , wherein the wired connection comprises a high-definition multimedia interface (HDMI) connection or an optical Sony/Philips Digital Interface (S/PDIF) cable.
11. The system of claim 8 , wherein the playback device comprises an audio-visual transceiver.
12. The system of claim 8 , wherein, to encode the clocking sample, the processor is further configured to encode the clocking sample using a frequency shift keying scheme.
13. The system of claim 8 , wherein the first audio stream is generated at a frequency inaudible to humans.
14. A non-transitory, tangible computer-readable medium having instructions stored thereon that, when executed by at least one computing device, cause the at least one computing device to perform operations comprising:
measuring, by a media content device, in response to detecting a wired connection between the media content device and a playback device, a clocking sample from an internal clock of the media content device;
encoding the clocking sample to generate a first audio stream;
combining, by the media content device, the first audio stream with a second audio stream to generate a combined audio stream, wherein the second audio stream is the media content;
transmitting, by the media content device, the combined audio stream through the playback device, wherein the combined audio stream includes the media content and is processed by the playback device;
receiving, by the media content device, a returned signal from the playback device, wherein the returned signal includes audio samples;
decoding, by the media content device, the audio samples received from the playback device to extract timestamps of the playback device; and
comparing, by the media content device, the extracted time stamps of the playback device with the clocking sample of the media content device to determine a latency of the playback device.
15. The medium of claim 14 , wherein the operations further comprise adjusting a timing of the second audio stream based on the latency of the playback device.