Circuit arrangement with an optimized frequency response and method for calibrating a circuit arrangement

Patent metadata

Field	Value
Publication number	US-10244315-B2
Application number	US-201715706825-A
Country	US
Kind code	B2
Filing date	Sep 18, 2017
Priority date	Sep 19, 2016
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

In various embodiments, a circuit arrangement includes a calibration filter set up to receive a signal based on a first signal and to provide a calibrated signal, the first signal being a signal which is provided by an analog/digital converter and is based on an analog signal, the analog signal being provided by at least one sensor of a sensor arrangement, a filter arrangement set up to receive a signal based on the first signal and to provide a second signal, and a controller set up to select a sensor-specific control signal dependent on the frequency response of the sensor from a plurality of control signals and to provide the calibration filter with said signal, the calibrated signal being based on the first signal and the sensor-specific control signal and corresponding or substantially corresponding to a predefined spectral mask in a predefined frequency range.

First claim

What is claimed is:

1. A circuit arrangement, comprising:
a calibration filter set up to receive a signal based on a first signal and to provide a calibrated signal;
the first signal being a signal which is provided by an analog/digital converter and is based on an analog signal, the analog signal being provided by at least one sensor of a sensor arrangement,
a filter arrangement set up to receive a signal based on the first signal and to provide a second signal; and
a controller set up to select a sensor-specific control signal dependent on the frequency response of the sensor from a plurality of control signals and to provide the calibration filter with the sensor-specific control signal, the calibrated signal being based on the first signal and the sensor-specific control signal and corresponding or substantially corresponding to a predefined spectral mask in a predefined frequency range.

2. The circuit arrangement of claim 1 ,
wherein the sensor arrangement comprises a plurality of sensors which each provide an analog signal, at least one signal from a sensor being changed with respect to the predefined spectral mask.

3. The circuit arrangement of claim 2 ,
wherein the signals from a plurality of sensors of the sensor arrangement are changed with respect to a common predefined spectral mask.

4. The circuit arrangement of claim 1 ,
wherein at least one sensor of the sensor arrangement comprises a diaphragm, a deflection of the diaphragm from a rest position generating the analog signal.

5. The circuit arrangement of claim 4 ,
wherein the diaphragm is or comprises a micro-electromechanical structure.

6. The circuit arrangement of claim 1 ,
wherein the calibration filter is a programmable calibration filter.

7. The circuit arrangement of claim 1 ,
wherein the calibration filter is a recursive calibration filter.

8. The circuit arrangement of claim 1 ,
wherein the calibration filter comprises at least two filter coefficients.

9. The circuit arrangement of claim 8 ,
wherein the calibration filter comprises at least three filter coefficients.

10. The circuit arrangement of claim 1 ,
wherein the circuit arrangement is in the form of a pressure sensor arrangement.

11. The circuit arrangement of claim 1 ,
wherein the circuit arrangement is in the form of a microphone arrangement.

12. The circuit arrangement of claim 11 ,
wherein the microphone arrangement comprises an arrangement of a plurality of microphones;
wherein the microphones are set up as sensors of the sensor arrangement.

13. The circuit arrangement of claim 1 ,
wherein the filter arrangement comprises at least one of the following filters or filter functions: a frequency-selective filter.

14. The circuit arrangement of claim 1 , further comprising:
a modulator which is connected to the analog/digital converter and is set up to provide a third signal based on the calibrated signal.

15. The circuit arrangement of claim 1 , further comprising:
an interface configured to provide a fourth signal which is based on the second signal;
wherein the interface is set up to provide an environment outside the circuit arrangement with the fourth signal.

16. The circuit arrangement of claim 15 ,
wherein the fourth signal is a single-bit signal.

17. The circuit arrangement of claim 15 ,
wherein the fourth signal is a multi-bit signal.

18. The circuit arrangement of claim 1 ,
wherein the sensor-specific control signal is dependent on a measured or estimated property of the sensor with respect to at least one of a predefined amplitude response, a predefined phase response, or a predefined group delay.

19. The circuit arrangement of claim 18 ,
wherein the control unit either comprises a memory or is connected to a memory;
wherein the memory storing the plurality of control signals and the controller are set up to select one of the plurality of control signals as the sensor-specific control signal depending on the measured or estimated property of the sensor and to provide the calibration filter with the sensor-specific control signal.

20. The circuit arrangement of claim 1 ,
wherein the calibration filter is configured to receive the signal provided by the filter arrangement.

21. The circuit arrangement of claim 1 ,
wherein the filter arrangement is configured to receive the calibrated signal provided by the calibration filter.

22. The circuit arrangement of claim 1 ,
wherein the sensor arrangement comprises at least one sensor which is set up to provide the analog signal.

23. The circuit arrangement of claim 1 , further comprising:
the analog/digital converter set up to receive the analog signal and to provide the first signal.

24. A method of calibrating a circuit arrangement,
the circuit arrangement comprising a calibration filter and at least one sensor which is set up to provide a sensor signal;
the method comprising:
detecting a property of a sensor of the at least one sensor;
determining a sensor-specific control signal from a multiplicity of control signals on the basis of the detected property and a predefined spectral mask; and
providing a calibrated signal from the calibration filter based on the sensor signal as modified by the sensor-specific control signal, the sensor-specific control signal causing recursive processing with at least two signal coefficients.

25. The method of claim 24 ,
wherein the circuit arrangement comprises:
the calibration filter set up to receive a first signal based on the sensor signal and to provide the calibrated signal;
the first signal being a signal which is provided by an analog/digital converter and is based on an analog signal, the analog signal being based on the sensor signal,
a filter arrangement set up to receive a signal based on the first signal and to provide a second signal; and
a controller set up to select the sensor-specific control signal dependent on the frequency response of the sensor from the multiplicity of control signals and to provide the calibration filter with the sensor-specific control signal, the calibrated signal being based on the first signal and the sensor-specific control signal and corresponding or substantially corresponding to a predefined spectral mask in a predefined frequency range.

Assignees

• Infineon Technologies Ag

Inventors

• Straeussnigg Dietmar
• Caspani Alessandro
• Bach Elmar

Classifications

• H04R3/04 Primary

  for correcting frequency response · CPC title

• H04R19/04

  Microphones (H04R19/01 takes precedence) · CPC title

• H04R3/005

  for combining the signals of two or more microphones (specially adapted for hearing aids H04R25/407) · CPC title

• H04R1/22

  for obtaining desired frequency characteristic only  {(circuit for combining transducers having different responses H04R3/00; for hearing aids H04R25/407)} · CPC title

• H04R2499/11

  Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's · CPC title