Hearing device comprising an amplifier system for minimizing variation in an acoustical signal caused by variation in gain of an amplifier

A hearing device comprising an amplifier system comprising:

• an amplifier,
• a battery configured to provide a supply voltage to the amplifier,
• a digital signal processor configured to provide an acoustical signal to the amplifier,
• an external processing unit configured to provide an enablement signal when the external processing unit performs an event, such as a wireless transmit or receive event or a memory write or read event, and the external processing unit is configured to transmit the enablement signal to a controller unit configured to receive the enablement signal,
• wherein:
• the controller unit is configured to generate a compensating signal based on the enablement signal received, the controller unit is configured to transmit the compensating signal to the digital signal processor, and the digital signal processor is configured to minimize the variation in the acoustical signal by providing the compensating signal into the acoustical signal,
• the controller unit is further configured to receive the enablement signal when the supply voltage is in an offset mode, wherein the supply voltage is in the offset mode when the supply voltage short termly drops below or above a supply voltage threshold, and the controller unit is further configured to transmit a request for a measured voltage during a time period based on the enablement signal, and
• a first analog-to-digital converter is configured to measure during the time period the supply voltage to the amplifier based on the request for the measured voltage transmitted by the controller unit, and
• wherein the controller unit is configured to determine another offset mode in the supply voltage based on a fitting of measured voltages of the supply voltage to the amplifier.

A method for minimizing variation in an acoustical signal caused by variation in a supply voltage to an amplifier, comprising:

• providing a supply voltage from a battery to the amplifier,
• providing an acoustical signal from a digital signal processor to the amplifier,
• receiving by a controller unit, from an external processing unit which is supplied by the battery, an enablement signal when the supply voltage is in an offset mode, wherein the supply voltage is in the offset mode when the supply voltage short termly drops below or above a supply voltage threshold as a result of a processing performed by the external processing unit, and requesting by the controller unit a measured voltage during a time period based on the enablement signal,
• transmitting a compensating signal from the controller unit to the digital signal processor, and
• minimizing the variation in the acoustical signal by the digital signal processor by providing the compensating signal into the acoustical signal,
• wherein the external processing unit is configured to provide the enablement signal when performing the processing, said processing being performed with respect to a wireless transmit or receive event, or a memory write or read event.