Operation mode switch of wireless headphones
Embodiments of wireless audio systems and methods for operation mode switch of wireless headphones are disclosed herein. In one example, a wireless audio system includes a first wireless headphone and a second wireless headphone. The first wireless headphone is configured to establish a first short-range wireless link with an audio source; transmit, to a second wireless headphone, link information associated with the first short-range wireless link; and remove the first short-range wireless link with the audio source in response to the second wireless headphone successfully establishing a second short-range wireless link with the audio source based on the link information. The second wireless headphone is configured to receive, from the first wireless headphone, the link information associated with the first short-range wireless link; and establish the second short-range wireless link with the audio source based on the link information.
1. A wireless audio system, comprising:
a first wireless headphone configured to:
establish a first short-range wireless link with an audio source;
transmit, to a second wireless headphone, link information associated with the first short-range wireless link, wherein the link information comprises an address of the audio source and encryption parameters and frequency-hopping spread spectrum (FHSS) parameters between the audio source and the first wireless headphone;
receive, from the audio source, audio information over the first short-range wireless link; and
transmit, to the second wireless headphone, a stop-snooping message to instruct the second wireless headphone to stop snooping;
a second wireless headphone configured to:
receive, from the first wireless headphone, the link information associated with the first short-range wireless link;
establish a second short-range wireless link with the audio source based on the link information;
snoop the audio information over the first short-range wireless link using the second short-range wireless link; and
in response to receiving the stop-snooping message, stop snooping the audio information over the first short-range wireless link using the second short-range wireless link,
wherein the first wireless headphone continues receiving the audio information from the audio source prior to the establishment of the second short-range wireless link between the second wireless headphone and the audio source;
the first wireless headphone and the second wireless headphone use a same frequency-hopping (FH) table of the FHSS parameters in the link information;
the first wireless headphone is further configured to, prior to transmitting the stop-snooping message, remove the first short-range wireless link and notify the audio source about the removal of the first short-range wireless link; and
the second wireless headphone is further configured to, in response to receiving the stop-snooping message, notify the audio source about the stop of snooping.
2. The wireless audio system of claim 1 , wherein:
the first wireless headphone is further configured to:
transmit, to the audio source, first microphone audio information over the first short-range wireless link;
transmit, to the second wireless headphone, a switch message instructing the second wireless headphone to enable microphone audio information transmission; and
disable microphone audio information transmission in response to the second wireless headphone enabling microphone audio information transmission; and
the second wireless headphone is further configured to:
receive, from the first wireless headphone, the switch message;
enable microphone audio information transmission in response to receiving the switch message; and
transmit, to the audio source, second microphone audio information over the second short-range wireless link.
3. The wireless audio system of claim 1 , wherein each of the first and second short-range wireless links includes a synchronous connection oriented (SCO) link.
4. The wireless audio system of claim 1 , wherein:
the second wireless headphone is further configured to:
transmit, to the first wireless headphone, a first message indicative of whether the audio information is successfully snooped by the second wireless headphone; and
transmit, to the audio source, a second message determined based on whether the audio information is successfully snooped by the second wireless headphone; and
the first wireless headphone is further configured to:
receive, from the second wireless headphone, the first message; and
transmit, to the audio source, a third message indicative of whether the audio information is successfully received by the first wireless headphone, a power of the third message adjusted based on the first message,
wherein the second message and the third message determine whether the audio source can receive the third message correctly.
5. The wireless audio system of claim 1 , wherein the first wireless headphone is further configured to repeatedly transmitting, to the audio source, a negative acknowledge (NACK) message to cause the audio source to re-transmit the audio information until a number of re-transmission reaches a threshold.
6. The wireless audio system of claim 1 , wherein the second wireless headphone is further configured to, in response to receiving the stop-snooping message, release snooping environment.
7. The wireless audio system of claim 1 , wherein the first wireless headphone is further configured to, prior to receiving the audio information over the first short-range wireless link, notify the audio source to start transmitting the audio information.
8. The wireless audio system of claim 1 , wherein the second wireless headphone is further configured to, prior to snooping the audio information over the first short-range wireless link, notify the audio source to start transmitting the audio information.
9. A wireless audio system, comprising:
a first wireless headphone configured to:
establish a first short-range wireless link with an audio source;
transmit, to a second wireless headphone, link information associated with the first short-range wireless link, wherein the link information comprises an address of the audio source and encryption parameters and frequency-hopping spread spectrum (FHSS) parameters between the audio source and the first wireless headphone;
receive, from the audio source, audio information over the first short-range wireless link; and
transmit, to the second wireless headphone, a stop-snooping message to instruct the second wireless headphone to stop snooping;
a second wireless headphone configured to:
receive, from the first wireless headphone, the link information associated with the first short-range wireless link;
establish a second short-range wireless link with the audio source based on the link information;
snoop the audio information over the first short-range wireless link using the second short-range wireless link; and
in response to receiving the stop-snooping message, stop snooping the audio information over the first short-range wireless link using the second short-range wireless link,
wherein the first wireless headphone continues receiving the audio information from the audio source prior to the establishment of the second short-range wireless link between the second wireless headphone and the audio source;
the first wireless headphone and the second wireless headphone use a same frequency-hopping (FH) table of the FHSS parameters in the link information;
the second wireless headphone is further configured to:
transmit, to the first wireless headphone, a first message indicative of whether the audio information is successfully snooped by the second wireless headphone; and
transmit, to the audio source, a second message determined based on whether the audio information is successfully snooped by the second wireless headphone; and
the first wireless headphone is further configured to:
receive, from the second wireless headphone, the first message; and
transmit, to the audio source, a third message indicative of whether the audio information is successfully received by the first wireless headphone, a power of the third message adjusted based on the first message,
wherein the second message and the third message determine whether the audio source can receive the third message correctly.
10. The wireless audio system of claim 9 , wherein:
the first wireless headphone is further configured to:
transmit, to the audio source, first microphone audio information over the first short-range wireless link;
transmit, to the second wireless headphone, a switch message instructing the second wireless headphone to enable microphone audio information transmission; and
disable microphone audio information transmission in response to the second wireless headphone enabling microphone audio information transmission; and
the second wireless headphone is further configured to:
receive, from the first wireless headphone, the switch message;
enable microphone audio information transmission in response to receiving the switch message; and
transmit, to the audio source, second microphone audio information over the second short-range wireless link.
11. The wireless audio system of claim 9 , wherein each of the first and second short-range wireless links includes a synchronous connection oriented (SCO) link.
12. The wireless audio system of claim 9 , wherein the first wireless headphone is further configured to repeatedly transmitting, to the audio source, a negative acknowledge (NACK) message to cause the audio source to re-transmit the audio information until a number of re-transmission reaches a threshold.