# US 11,115,753 B2 · Sound reproduction device and sound reproduction system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,115,753 B2 - Document ID: US11115753B2 - Status: Granted - Kind: B2 - Application number: 16/936,528 - Filed: 2020-07-23 - Published: 2021-01-28 - Granted: 2021-09-07 - Earliest claimed: 2019-07-25 - Assignees: Lapis Semiconductor Co., Ltd. - Applicants: Lapis Semiconductor Co., Ltd. - Inventors: Takashi Yamashita - Web page: https://patentgrep.com/patent/US11115753B2 ## CPC - H04R 3/04: for correcting frequency response - H04R 5/04: Circuit arrangements, {e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments (combinations of amplifiers H03F3/68; stereophonic systems H04S)} - H04R 3/12: for distributing signals to two or more loudspeakers {(specially adapted for hearing aids H04R25/407)} - H04R 2420/01: Input selection or mixing for amplifiers or loudspeakers - H04R 2420/07: Applications of wireless loudspeakers or wireless microphones - H04R 2430/20: Processing of the output signals of the acoustic transducers of an array for obtaining a desired directivity characteristic (H04R2203/12 takes precedence) - 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 sound reproduction device including a sound reproduction control circuit that performs a required computation on audio source data so as to generate sound reproduction data to send to a speaker; a first communication interface circuit that performs communication with a control device; a counter circuit whose count operation is controlled by a control signal received from the control device through the first communication interface circuit, and that outputs a state of the count operation; and an error control circuit that stops generation of the sound reproduction data by the sound reproduction control circuit based on the state of the count operation. ## Claims ### Claim 1 A sound reproduction device comprising: a sound reproduction control circuit configured to perform a required computation on audio source data so as to generate sound reproduction data to send to a speaker; a first communication interface circuit configured to perform communication with a control device; a counter circuit whose count operation is controlled by a control signal received from the control device through the first communication interface circuit, and configured to output a state of the count operation; and an error control circuit configured to stop generation of the sound reproduction data by the sound reproduction control circuit based on the state of the count operation, wherein the control signal includes a start signal for starting the count operation, and a reset signal for resetting the count operation subsequent to the start signal, and in cases in which the state of the count operation is an overflow occurring as a result of the reset signal not having been received by the counter circuit, the error control circuit stops the generation of the sound reproduction data by the sound reproduction control circuit. ### Claim 2 (depends on 1) The sound reproduction device of claim 1, wherein the control device includes a second communication interface circuit configured to perform communication with the first communication interface circuit, and the overflow occurs in cases in which the counter circuit is unable to receive the reset signal due to a communication abnormality between the first communication interface circuit and the second communication interface circuit. ### Claim 3 (depends on 1) The sound reproduction device of claim 1, further comprising: a monitoring circuit disposed between the sound reproduction control circuit and the speaker, and configured to output a state signal indicating a connection state of the speaker; and a detection circuit configured to detect the connection state of the speaker based on the state signal, wherein the error control circuit controls the counter circuit so as to start the count operation in cases in which an abnormal connection state has been detected by the detection circuit, and the control device sends an error clear signal to the counter circuit to stop the count operation in cases in which determination is made that the abnormal connection state detected by the detection circuit is a result of false detection. ### Claim 4 (depends on 3) The sound reproduction device of claim 3, wherein the control device determines that the abnormal connection state is the result of false detection in cases in which a period during which the abnormal connection state is detected by the detection circuit is shorter than a predetermined period. ### Claim 5 (depends on 3) The sound reproduction device of claim 3, wherein the error control circuit stops the generation of the sound reproduction data by the sound reproduction control circuit in cases in which the counter circuit has overflowed prior to the count operation of the counter circuit stopping. ### Claim 6 (depends on 1) A sound reproduction system comprising: the sound reproduction device of claim 1; and the control device, the control device including a second communication interface circuit configured to perform communication with the first communication interface circuit. ### Claim 7 A sound reproduction device comprising: a first communication interface circuit configured to perform communication with a control device; a memory; and a processor connected to the memory, the processor configured to perform a required computation on audio source data so as to generate sound reproduction data to send to a speaker, control a count operation using a control signal received from the control device through the first communication interface circuit, and output a state of the count operation, and stop generation of the sound reproduction data based on the state of the count operation, wherein the control signal includes a start signal for starting the count operation, and a reset signal for resetting the count operation subsequent to the start signal, and in cases in which the state of the count operation is an overflow occurring as a result of the reset signal not having been received, the generation of the sound reproduction data is stopped. ### Claim 8 (depends on 7) The sound reproduction device of claim 7, wherein the control device includes a second communication interface circuit configured to perform communication with the first communication interface circuit, and the overflow occurs in cases in which the reset signal cannot be received due to a communication abnormality between the first communication interface circuit and the second communication interface circuit. ### Claim 9 (depends on 7) The sound reproduction device of claim 7, wherein the generation of the sound reproduction data is stopped in cases in which overflow has occurred prior to the count operation stopping.