Signal processing device, air pressure sensor assembly and electronics apparatus
The present invention discloses a signal processing device, an air pressure sensor assembly and an electronics apparatus. The signal processing device for a sensing signal comprises: an input unit, which is configured to receive the sensing signal; and a processing unit, which is configured to attenuate a higher frequency component of the sensing signal so that the value of the higher frequency component when the sensing signal is stable is lower than that when the sensing signal is changing. According to an embodiment of this invention, the present invention can reduce the noise in a sensing signal from an air pressure sensor during a stable state.
1. A signal processing device for a sensing signal, comprising:
an input unit, which is configured to receive the sensing signal; and
a processing unit, which is configured to attenuate a higher frequency component of the sensing signal so that the amplitude of the higher frequency component when the sensing signal is stable is lower than the amplitude of the higher frequency component when the sensing signal is changing;
wherein the processing unit comprises a band splitting module which is configured to split the sensing signal into a first sub-band and a second sub-band, wherein the second sub-band is higher than the first sub-band, and a bandwidth adjusting module which is configured to expand the bandwidth of the first sub-band when the sensing signal is changing.
2. The signal processing device according to claim 1 , wherein the processing unit comprises:
an attenuation module, which is configured to attenuate the second sub-band when the sensing signal is stable.
3. The signal processing device according to claim 2 , wherein the attenuation module is configured to cancel the second sub-band when the sensing signal is stable.
4. The signal processing device according to claim 1 , further comprising:
a detector, which is configured to detect the changing of the sensing signal.
5. The signal processing device according to claim 4 , wherein the detector receives the sensing signal before it is converted into a digital signal.
6. The signal processing device according to claim 1 , further comprising:
a command input, which receives a command signal causing a changing of the sensing signal;
wherein the processing unit determines that the sensing signal is changing when receiving the command signal.
7. An air pressure sensor assembly, comprising:
an air pressure sensor; and
the signal processing device according to claim 1 .
8. An electronics apparatus, comprising an air pressure sensor assembly according to claim 7 .