# US 12,119,905 B2 · Transmit antenna diversity wireless audio system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,905 B2 - Document ID: US12119905B2 - Status: Granted - Kind: B2 - Application number: 18/192,555 - Filed: 2023-03-29 - Published: 2024-03-28 - Granted: 2024-10-15 - Earliest claimed: 2019-08-05 - Assignees: Shure Acquisition Holdings, Inc. - Applicants: Shure Acquisition Holdings, Inc. - Inventors: Michael Rodriguez; Robert Mamola - Web page: https://patentgrep.com/patent/US12119905B2 ## CPC - H04B 7/0615: {of weighted versions of same signal} - H04B 7/0602: {using antenna switching (H04B7/0686 takes precedence; antenna beam directivity switching H01Q3/24)} - H04B 7/0667: {of delayed versions of same signal (using space-time coding H04L1/0618)} - H04B 7/0671: {using different delays between antennas} - H04B 7/068: {using space frequency diversity (space-frequency coding H04L1/0606)} - H04L 1/0643: {block codes} - H04L 1/0668: {Orthogonal systems, e.g. using Alamouti codes} - H04L 7/0033: {Correction by delay} - H04L 27/2613: {Structure of the reference signals} - H04R 3/00: Circuits for transducers (arrangements for producing a reverberation or echo sound G10K15/08; amplifiers H03F) - H04R 2420/07: Applications of wireless loudspeakers or wireless microphones - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) ## Abstract A wireless audio system including a transmitter using multiple antenna diversity techniques for different signal types is provided. Multipath performance may be optimized, along with improved spectral efficiency of the system. ## Claims ### Claim 1 A wireless audio transmitter, comprising: a plurality of antennas; a plurality of converters in communication with the plurality of antennas; an encoder configured to: receive and encode one or more symbols based on a first diversity technique; and route the encoded one or more symbols to one or more converters of the plurality of converters; and a synchronization transformer configured to receive and transform a synchronization signal based on a second diversity technique, wherein each of the plurality of converters is in communication with the encoder, the synchronization transformer, and a corresponding antenna of the plurality of antennas, and wherein each of the one or more converters is configured to: combine the encoded one or more symbols and the transformed synchronization signal to generate a combined audio signal for transmission via a corresponding one of the plurality of antennas. ### Claim 2 (depends on 1) The wireless audio transmitter of claim 1, wherein the one or more symbols comprise at least one data symbol, control symbol, or pilot symbol. ### Claim 3 (depends on 1) The wireless audio transmitter of claim 1, wherein the first diversity technique comprises space-time block coding in frequency domain. ### Claim 4 (depends on 1) The wireless audio transmitter of claim 1, wherein the second diversity technique comprises at least one of: a cyclic delay diversity (CDD) technique; or a round robin switched diversity technique. ### Claim 5 (depends on 1) The wireless audio transmitter of claim 1, wherein at least some of the plurality of converters are configured to use an inverse Fast Fourier Transform. ### Claim 6 (depends on 1) The wireless audio transmitter of claim 1, wherein: a first subset of the plurality of antennas is configured to cover a first zone; and a second subset of the plurality of antennas is configured to cover a second zone. ### Claim 7 (depends on 1) The wireless audio transmitter of claim 1, wherein the plurality of antennas is configured to transmit audio signals, to a wireless audio receiver, via a multiple-input multiple-output (MIMO) scheme. ### Claim 8 (depends on 1) The wireless audio transmitter of claim 1, wherein: the encoder is further configured to receive and route one or more second symbols to each of the plurality of converters; the synchronization transformer is further configured to receive and transform a second synchronization signal based on the second diversity technique; and each of the plurality of converters is configured to: combine the one or more second symbols and the transformed second synchronization signal to generate a second combined audio signal for transmission via a corresponding one of the plurality of antennas. ### Claim 9 A method comprising: encoding one or more symbols based on a first diversity technique; routing the encoded one or more symbols to one or more converters of a plurality of converters; transforming a synchronization signal based on a second diversity technique; combining, at each of the one or more converters, the encoded one or more symbols and the transformed synchronization signal to generate a combined signal; and transmitting, via a corresponding antenna of a plurality of antennas, the combined signal. ### Claim 10 (depends on 9) The method of claim 9, wherein the one or more symbols comprise at least one data symbol, control symbol, or pilot symbol. ### Claim 11 (depends on 9) The method of claim 9, wherein the first diversity technique comprises space-time block coding in frequency domain. ### Claim 12 (depends on 9) The method of claim 9, wherein the second diversity technique comprises at least one of: a cyclic delay diversity (CDD) technique; or a round robin switched diversity technique. ### Claim 13 (depends on 9) The method of claim 9, wherein: a first subset of the plurality of antennas is configured to cover a first zone; and a second subset of the plurality of antennas is configured to cover a second zone. ### Claim 14 (depends on 9) The method of claim 9, further comprising: routing one or more second symbols to each of the plurality of converters; transforming a second synchronization signal based on the second diversity technique; combining, at each of the plurality of converters, the one or more second symbols and the transformed second synchronization signal to generate a second combined audio signal; and transmitting, via a corresponding antenna of the plurality of antennas, the second combined audio signal. ### Claim 15 A non-transitory computer readable medium storing instructions that, when executed, cause: encoding, at a transmitter, one or more symbols based on a first diversity technique; routing the encoded one or more symbols to one or more converters of a plurality of converters; transforming a synchronization signal based on a second diversity technique; combining, at each of the one or more converters, the encoded one or more symbols and the transformed synchronization signal to generate a combined signal; and transmitting, via a corresponding antenna of a plurality of antennas, the combined signal. ### Claim 16 (depends on 15) The non-transitory computer readable medium of claim 15, wherein the one or more symbols comprise at least one data symbol, control symbol, or pilot symbol. ### Claim 17 (depends on 15) The non-transitory computer readable medium of claim 15, wherein the first diversity technique comprises space-time block coding in frequency domain. ### Claim 18 (depends on 15) The non-transitory computer readable medium of claim 15, wherein the second diversity technique comprises at least one of: a cyclic delay diversity (CDD) technique; or a round robin switched diversity technique. ### Claim 19 (depends on 15) The non-transitory computer readable medium of claim 15, wherein: a first subset of the plurality of antennas is configured to cover a first zone; and a second subset of the plurality of antennas is configured to cover a second zone. ### Claim 20 (depends on 15) The non-transitory computer readable medium of claim 15, wherein the instructions, when executed, cause: routing one or more second symbols to each of the plurality of converters; transforming a second synchronization signal based on the second diversity technique; combining, at each of the plurality of converters, the one or more second symbols and the transformed second synchronization signal to generate a second combined audio signal; and transmitting, via a corresponding antenna of the plurality of antennas, the second combined audio signal.