# US 12,113,780 B2 · Encrypted 1-bit audio distribution system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,113,780 B2 - Document ID: US12113780B2 - Status: Granted - Kind: B2 - Application number: 17/946,180 - Filed: 2022-09-16 - Published: 2023-01-19 - Granted: 2024-10-08 - Earliest claimed: 2020-04-10 - Assignees: Crestron Electronics, Inc. - Applicants: Crestron Electronics, Inc. - Inventors: Philip L. Kirkpatrick - Web page: https://patentgrep.com/patent/US12113780B2 ## CPC - H04L 63/0428: {wherein the data content is protected, e.g. by encrypting or encapsulating the payload} - H04L 63/0485: {Networking architectures for enhanced packet encryption processing, e.g. offloading of IPsec packet processing or efficient security association look-up} - G06F 3/162: {Interface to dedicated audio devices, e.g. audio drivers, interface to CODECs} - G06F 3/165: {Management of the audio stream, e.g. setting of volume, audio stream path} - G10L 19/008: Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing - H04H 60/04: Studio equipment; Interconnection of studios - H04L 12/28: characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks] (wireless communication networks H04W {; arrangements for dividing the transmission path H04W40/00}) - H04R 3/00: Circuits for transducers (arrangements for producing a reverberation or echo sound G10K15/08; amplifiers H03F) - H04R 2201/003: Mems transducers or their use - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G10L: SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING - H04H: BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects of broadcast systems H04N) - 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 An innovative system for transmitting encrypted 1-bit audio over an Ethernet network comprises using an omni-directional micro-electrical-mechanical system acoustic sensor element to provide an analog input signal to a sigma-delta modulator that then creates a pulse density modulated 1-bit data stream, at an audio oversampling rate, to a first input of a first exclusive-or (XOR) logic gate. The second input of the XOR logic gate is simultaneously presented with a first pseudo-random 1-bit data stream, at the same audio oversampling rate, thereby resulting in an encrypted pulse density modulated (PDM) 1-bit data stream at the output of the XOR logic gate. The encrypted PDM 1-bit data stream is clocked into a first-in first-out (FIFO) memory at the audio oversampling rate and is clocked out of the first FIFO memory as Ethernet PDM frame data packages at a predetermined Ethernet PHY transfer rate. ## Claims ### Claim 1 A method for encrypting data over an Ethernet connection, the method comprising: (a) XORing a pulse density modulated (PDM) 1-bit data stream with a first pseudo-random 1-bit data stream to generate an encrypted PDM 1-bit data stream; (b) packaging the encrypted PDM 1-bit data stream into Ethernet PDM frame data; and (c) transmitting the Ethernet PDM frame data from a first Ethernet interface. ### Claim 2 (depends on 1) The method according to claim 1, further comprising: (d) receiving the transmitted Ethernet PDM frame data at a second Ethernet interface; (e) reconstructing the encrypted PDM 1-bit data stream from the Ethernet PDM frame data; (f) recovering the PDM 1-bit data stream by XORing the encrypted PDM 1-bit data stream with a second pseudo-random 1-bit data stream; (g) decimating the PDM 1-bit data stream into an N-bit pulse coded modulated (PCM) digital data stream at a predetermined audio sampling rate; and (h) converting the N-bit PCM digital data stream into an analog output signal, wherein the first and second pseudo-random 1-bit data streams comprise identical bit sequences at a predetermined encoding rate, and the steps of producing and reconstructing the encrypted PDM 1-bit data stream by XORing are performed at the predetermined encoding rate. ### Claim 3 (depends on 2) The method according to claim 2, further comprising: converting an audio input signal into the PDM 1-bit data stream at a first predetermined audio oversampling rate. ### Claim 4 (depends on 3) The method according to claim 3, wherein the step of packaging the encrypted PDM 1-bit data stream into Ethernet PDM frame data comprises: loading a first first-in first-out (FIFO) memory at the first predetermined audio oversampling rate and unloading the first FIFO memory at a first predetermined Ethernet physical layer (PHY) transfer rate. ### Claim 5 (depends on 3) The method according to claim 3, wherein the step of reconstructing the encrypted PDM 1-bit data stream from the Ethernet PDM frame data comprises: loading a second FIFO memory at a second predetermined Ethernet PHY transfer rate and unloading the second FIFO memory at a second predetermined audio oversampling rate. ### Claim 6 (depends on 3) The method according to claim 3, wherein the N-bit PCM digital data stream is a 16-bit pulse code modulated digital data stream. ### Claim 7 (depends on 3) The method according to claim 3, wherein the first and second predetermined audio oversampling rates are both a same integer multiple of the predetermined audio sampling rate. ### Claim 8 (depends on 3) The method of claim 3, wherein: the predetermined encoding rate is an integer multiple of the predetermined audio sampling rate. ### Claim 9 (depends on 3) The method of claim 3, wherein: the predetermined audio sampling rate is an integer multiple of the predetermined encoding rate. ### Claim 10 (depends on 3) The method of claim 3, further comprising the steps of: transmitting and receiving a unique seed value from the first Ethernet interface to the second Ethernet Interface; computing the first pseudo-random 1-bit data stream based on this unique seed value; and computing the second pseudo-random 1-bit data stream based on this unique seed value.