Dual-band wireless headphones
Embodiments of wireless audio systems and wireless transceivers for wirelessly communicating audio information are disclosed herein. In one example, a wireless audio system includes a primary wireless transceiver and a secondary wireless transceiver. The primary wireless transceiver includes a first and a second radio frequency (RF) module, a media access control (MAC) layer module shared by the first and the second RF module and at least one physical layer module configured to generate a first physical link between an audio source and the first RF module and generate a second physical link between the second RF module and the secondary wireless. The secondary wireless transceiver includes a third and a fourth RF module. The first and fourth RF modules implement a first short-range wireless communication protocol, and each of the second and third RF modules implements a second short-range wireless communication protocol.
1. A wireless audio system, comprising:
a primary wireless transceiver comprising:
a first radio frequency (RF) module configured to receive, from an audio source, first audio information at a first frequency;
a second RF module operatively coupled to the first RF module and configured to transmit second audio information at a second frequency different from the first frequency, wherein the second audio information is generated based on the first audio information; and
a media access control (MAC) layer module shared by the first RF module and the second RF module; and
a secondary wireless transceiver comprising:
a third RF module configured to receive, from the second RF module of the primary wireless transceiver, the second audio information at the second frequency; and
a fourth RF module configured to (i) receive, from the audio source, the first audio information at the first frequency only when the first RF module of the primary wireless transceiver is not receiving the first audio information at the first frequency from the audio source, and (ii) be disabled when the third RF module receives the second audio information from the second RF module of the primary wireless transceiver,
wherein the first and fourth RF modules implement a first short-range wireless communication protocol, and each of the second and third RF modules implements a second short-range wireless communication protocol amended from the first short-range wireless communication protocol; and
the primary wireless transceiver further comprises at least one physical layer module configured to generate a first link between the audio source and the first RF module based on the first short-range wireless communication protocol and generate a second link between the second RF module and the third RF module based on the second short-range wireless communication protocol.
2. The wireless audio system of claim 1 , wherein the second frequency is between 2.5 GHz and 10 GHz.
3. The wireless audio system of claim 2 , wherein
the first audio information comprises left-channel audio information and right-channel audio information;
the second RF module is further configured to generate the second audio information based on separating the first audio information and coding one of the separated left-channel audio information or the right-channel audio information using an Opus coding format; and
the third RF module is further configured to receive and decode the second audio information based on the Opus coding format.
4. The wireless audio system of claim 1 , wherein each of the first short-range wireless communication protocol and the second short-range wireless communication protocol comprises at least one of a Bluetooth Low Energy (BLE) protocol or a BLE audio protocol.
5. The wireless audio system of claim 1 , wherein
the second frequency is between 5 MHz and about 50 MHz; and
each one of the first short-range wireless communication protocol and the second short-range wireless communication protocol comprises a Wi-Fi protocol.
6. The wireless audio system of claim 1 , wherein the second audio information is modulated at a predetermined symbol rate, higher than or equal to 1M symbol/s.
7. The wireless audio system of claim 6 , wherein
the second audio information comprises an access code, a header, and a payload; and
the at least one physical layer module of the primary wireless transceiver is further configured to modulate the access code and the header of the second audio information based on a Gaussian frequency shift keying (GFSK) method, and to modulate the payload of the second audio information based on a Differential Phase Shift Keying (DPSK) method.
8. The wireless audio system of claim 7 , wherein the symbol rate for the second audio information is higher than 1M symbol/s.
9. The wireless audio system of claim 7 , wherein the symbol rate for the second audio information is 2M symbol/s or 3M symbol/s.
10. The wireless audio system of claim 7 , wherein
the symbol rate for the access code and the header of the second audio information is 1M symbol/s; and
the symbol rate for the payload of the second audio information is higher than 1M symbol/s.
11. The wireless audio system of claim 10 , wherein the symbol rate for the payload of the second audio information is 2M symbol/s or 3M symbol/s.
12. The wireless audio system of claim 7 , wherein the payload of the second audio information further comprises at least one Enhanced Data Rate (EDR) packet comprising:
a guard time for preparing for changing a modulation to the DPSK;
a synchronization sequence comprising at least one of a reference symbol or a DPSK symbol;
an enhanced data rate payload comprising at least one of user information or control information; and
a trailer indicating an end of the at least one EDR packet.
13. The wireless audio system of claim 12 , wherein the guard time is between 1 μs and 10 μs.
14. The wireless audio system of claim 13 , wherein the synchronization sequence is configured to synchronize a symbol timing and a symbol phase for the DPSK.
15. A wireless audio system, comprising:
a primary wireless transceiver comprising:
a first radio frequency (RF) module configured to receive, from an audio source, first audio information at a first frequency; and
a second RF module operatively coupled to the first RF module and configured to transmit second audio information at a second frequency lower than the first frequency, the second audio information generated based on the first audio information, wherein the second RF module modulates the second audio information at a predetermined symbol rate, higher than or equal to 1M symbol/s; and
a secondary wireless transceiver comprising:
a third RF module configured to receive, from the second RF module of the primary wireless transceiver, the second audio information at the second frequency; and
a fourth RF module configured to (i) receive, from the audio source, the first audio information at the first frequency, only when the first RF module of the primary wireless transceiver is not receiving the first audio information at the first frequency from the audio source, and (ii) be disabled when the third RF module receives the second audio information from the second RF module of the primary wireless transceiver,
wherein each of the first and fourth RF modules implements a first short-range wireless communication protocol, and each of the second and third RF modules implements a second short-range wireless communication protocol amended from the first short-range wireless communication protocol; and
the primary wireless transceiver further comprises a first physical layer module corresponding to the first RF module configured to generate a first link between the audio source and the first RF module based on the first short-range wireless communication protocol and a second physical layer module corresponding to the second RF module configured to generate a second link between the second RF module and the third RF module based on the second short-range wireless communication protocol.
16. A wireless transceiver, comprising:
a first radio frequency (RF) module configured to receive, from another wireless transceiver, second audio information at a second frequency, wherein the second audio information is generated based on first audio information, and the first audio information is received by the another wireless transceiver at a first frequency different from the second frequency;
a second RF module operatively coupled to the first RF module and configured to (i) receive from an audio source, the first audio information at the first frequency only when the another wireless transceiver is not receiving the first audio information from the audio source, and (ii) be disabled when the first RF module receives the second audio information from the another wireless transceiver; and
at least one physical layer module configured to generate a first link between the audio source and the second RF module based on a first short-range wireless communication protocol and generate a second link between the another wireless transceiver and the first RF module based on a second short-range wireless communication protocol.
17. The wireless transceiver of claim 16 , wherein the second frequency is between 2.5 GHz and 10 GHz.
18. The wireless transceiver of claim 16 , wherein each one of the first audio information and the second audio information is transmitted for near-field magnetic induction (NFMI) communication.
19. The wireless transceiver of claim 16 , wherein each of the first short-range wireless communication protocol and the second short-range wireless communication protocol comprises at least one of a Bluetooth Low Energy (BLE) protocol or a BLE audio protocol.
20. The wireless transceiver of claim 19 , wherein
the second audio information comprises an access code, a header, and a payload; and
the physical layer module is further configured to modulate the access code and the header of the second audio information based on a Gaussian frequency shift keying (GFSK) method and modulate the payload of the second audio information based on a Differential Phase Shift Keying (DPSK) method.