# US 2014/0153758 A1 · Hearing device with analog filtering and associated method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0153758 A1 - Document ID: US20140153758A1 - Status: Published application - Kind: A1 - Application number: 14/161,109 - Filed: 2014-01-22 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: GN ReSound A/S - Applicants: GN ReSound A/S - Inventors: Peter SIEGUMFELDT - Web page: https://patentgrep.com/patent/US20140153758A1 ## CPC - H04R 25/00: Electric hearing aids - H04R 25/502: {using analog signal processing} - H04R 2410/07: Mechanical or electrical reduction of wind noise generated by wind passing a microphone - H04R 2460/03: Aspects of the reduction of energy consumption in hearing devices - 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 hearing device includes: a microphone for converting audio into an audio signal; a preprocessing unit for analog processing of the audio signal and having an input and an output, wherein the input is connected to an output of the microphone; an A/D converter for converting the processed analog audio signal into a digital audio signal, the A/D converter having an input and an output, wherein the input of the A/D converter is connected to the output of the preprocessing unit; and a processing unit for digital processing of an output from the A/D converter, wherein the processing unit is connected to the preprocessing unit, and is configured to apply a first transfer function to the audio signal in a first mode of operation, or a second transfer function with a cutoff frequency to the audio signal in a second mode of operation, depending on a control signal. ## Claims ### Claim 1 A hearing device comprising: a microphone for converting audio into an audio signal; a preprocessing unit for analog processing of the audio signal, wherein the preprocessing unit is coupled to the microphone; an A/D converter for converting the processed analog audio signal into a digital audio signal, wherein the A/D converter is coupled to the preprocessing unit; and a processing unit for digital processing of an output from the A/D converter, wherein the processing unit is coupled to the preprocessing unit; wherein the preprocessing unit is configured to apply a first transfer function to the audio signal in a first mode of operation, or a second transfer function with a cutoff frequency to the audio signal in a second mode of operation, depending on a control signal from the processing unit; and wherein the processing unit comprises a detector unit configured to determine one or more noise parameter(s), and wherein the processing unit is configured to send the control signal indicative of the first or second mode of operation to the preprocessing unit based on the one or more noise parameter(s). ### Claim 2 (depends on 1) The hearing device according to claim 1, wherein the preprocessing unit comprises a first capacitor circuit with a variable first capacitance value, wherein the first capacitance value depends on the control signal from the processing unit. ### Claim 3 (depends on 1) The hearing device according to claim 1, wherein the preprocessing unit comprises a first resistor circuit with a variable first resistance value, wherein the first resistance value depends on the control signal from the processing unit. ### Claim 4 (depends on 3) The hearing device according to claim 3, wherein the preprocessing unit comprises a second resistor circuit with a variable second resistance value, wherein the second resistance value depends on the control signal from the processing unit. ### Claim 5 (depends on 1) The hearing device according to claim 1, wherein the preprocessing unit comprises an amplifier. ### Claim 6 (canceled) ### Claim 7 (depends on 1) The hearing device according to claim 1, wherein the processing unit is configured to send the control signal to the preprocessing unit to switch from the first mode of operation to the second mode of operation when a noise criterion is fulfilled. ### Claim 8 (depends on 1) The hearing device according to claim 1, wherein the processing unit is configured to send the control signal to the preprocessing unit to switch from the second mode of operation to the first mode of operation when a noise criterion is fulfilled. ### Claim 9 (depends on 1) The hearing device according to claim 1, wherein the preprocessing unit is configured to apply a third transfer function with a cutoff frequency to the audio signal in a third mode of operation as an alternative to the first mode and the second mode of operation depending on the control signal from the processing unit. ### Claim 10 (depends on 1) The hearing device according to claim 1, wherein the first transfer function is a high pass filter function and having a cutoff frequency, wherein the cutoff frequency of the first transfer function is anywhere in a range from 100 Hz to 1 kHz. ### Claim 11 (depends on 10) The hearing device according to claim 10, wherein the cutoff frequency of the second transfer function is larger than the cutoff frequency of the first transfer function. ### Claim 12 (depends on 1) The hearing device according to claim 1, wherein the second transfer function is a high pass filter function, and wherein the cutoff frequency is anywhere in a range from 100 Hz to 2 kHz. ### Claim 13 (depends on 1) The hearing device according to claim 1, wherein the audio signal comprises a first part that corresponds with a first time point, and a second part that corresponds with a second time point; and wherein the preprocessing unit is configured to apply one of the first transfer function and the second transfer function to the first part of the audio signal based on a first value of the control signal from the processing unit, and another one of the first transfer function and the second transfer function to the second part of the audio signal based on a second value of the control signal from the processing unit. ### Claim at position 14 14-16. (canceled) ### Claim 17 A hearing device comprising: a microphone for converting audio into an audio signal; a preprocessing unit for analog processing of the audio signal, wherein the preprocessing unit is coupled to the microphone; an A/D converter for converting the processed analog audio signal into a digital audio signal, wherein the A/D converter is coupled to the preprocessing unit; and a processing unit for digital processing of an output from the A/D converter, wherein the processing unit is coupled to the preprocessing unit; wherein the preprocessing unit is configured to apply a first transfer function to the audio signal in a first mode of operation, or a second transfer function with a cutoff frequency to the audio signal in a second mode of operation; wherein the processing unit is configured to send a control signal to the preprocessing unit to switch from the first mode of operation to the second mode of operation when a noise criterion is fulfilled. ### Claim 18 (depends on 17) The hearing device according to claim 17, wherein the first transfer function is a high pass filter function and having a cutoff frequency, wherein the cutoff frequency of the first transfer function is anywhere in a range from 100 Hz to 1 kHz. ### Claim 19 (depends on 18) The hearing device according to claim 18, wherein the cutoff frequency of the second transfer function is larger than the cutoff frequency of the first transfer function. ### Claim 20 (depends on 17) The hearing device according to claim 17, wherein the second transfer function is a high pass filter function, and wherein the cutoff frequency is anywhere in a range from 100 Hz to 2 kHz. ### Claim 21 A hearing device comprising: a microphone for converting audio into an audio signal; a preprocessing unit for analog processing of the audio signal, wherein the preprocessing unit is coupled to the microphone; an A/D converter for converting the processed analog audio signal into a digital audio signal, wherein the A/D converter is coupled to the preprocessing unit; and a processing unit for digital processing of an output from the A/D converter, wherein the processing unit is coupled to the preprocessing unit; wherein the preprocessing unit is configured to apply a first transfer function to the audio signal in a first mode of operation, or a second transfer function with a cutoff frequency to the audio signal in a second mode of operation; wherein the processing unit is configured to send a control signal to the preprocessing unit to switch from the second mode of operation to the first mode of operation when a noise criterion is fulfilled. ### Claim 22 (depends on 21) The hearing device according to claim 21, wherein the first transfer function is a high pass filter function and having a cutoff frequency, wherein the cutoff frequency of the first transfer function is anywhere in a range from 100 Hz to 1 kHz. ### Claim 23 (depends on 22) The hearing device according to claim 22, wherein the cutoff frequency of the second transfer function is larger than the cutoff frequency of the first transfer function. ### Claim 24 (depends on 21) The hearing device according to claim 21, wherein the second transfer function is a high pass filter function, and wherein the cutoff frequency is anywhere in a range from 100 Hz to 2 kHz.