Signal processing apparatus, signal processing method and communication apparatus
View Patent ↗Disclosed herein is a signal processing apparatus including: a voltage-controlled oscillation block having a parameter high in correlation with a filter; a measuring block configured to measure an oscillation frequency of the voltage-controlled oscillation block; and a control block configured to control the parameter of the filter by use of a measuring result of the oscillation frequency obtained by the measuring block.
1. A signal processing apparatus comprising:
a voltage-controlled oscillation block having a parameter that is correlated with a parameter of a filter;
a measuring block configured to measure an oscillation frequency of the voltage-controlled oscillation block; and
a control block configured to control the parameter of the filter by use of a measuring result of the oscillation frequency obtained by the measuring block,
wherein the control block computes a fluctuation coefficient by use of a frequency measuring result obtained by the measuring block and a standard sample frequency measuring result, and controls the parameter of the filter by use of the computed fluctuation coefficient.
2. The signal processing apparatus according to claim 1 , wherein the parameter of the filter is capacitance.
3. The signal processing apparatus according to claim 2 , wherein the voltage-controlled oscillation block is an inductance-capacitance voltage-controlled oscillator having inductance and capacitance.
4. The signal processing apparatus according to claim 1 ,
wherein the measuring block measures the oscillation frequency as a channel tuning operation, and
the frequency measuring result that is used by the control block for computing the fluctuation coefficient is a result of the measuring block measuring the oscillation frequency as the channel tuning operation.
5. The signal processing apparatus according to claim 1 , wherein the control block controls parameters of a plurality of filters, including the filter, by use of the computed fluctuation coefficient.
6. A signal processing method for a signal processing apparatus, the method executed by the signal processing apparatus, comprising:
measuring an oscillation frequency of a voltage-controlled oscillation block having a parameter that is correlated with a parameter of a filter;
computing a fluctuation coefficient by using a result of the measuring of the oscillation frequency and a standard sample frequency measuring result; and
controlling the parameter of the filter by use of the computed fluctuation coefficient.
7. The method according to claim 6 , wherein the parameter of the filter is capacitance.
8. The method according to claim 7 , wherein the voltage-controlled oscillation block is an inductance-capacitance voltage-controlled oscillator having inductance and capacitance.
9. The method according to claim 6 ,
wherein the measuring of the oscillation frequency of the voltage-controlled oscillation block is accomplished by using a channel tuning operation, and
the frequency measuring result used for computing the fluctuation coefficient is a result of the channel tuning operation.
10. The method according to claim 6 , further comprising:
controlling parameters of a plurality of filters, including the filter, by use of the computed fluctuation coefficient.
11. A communication apparatus comprising:
a reception block configured to receive a signal;
a filter configured to extract a predetermined frequency component from the signal received by the reception block;
a voltage-controlled oscillation block having a parameter that is correlated with a parameter of the filter;
a measuring block configured to measure an oscillation frequency of the voltage-controlled oscillation block; and
a control block configured to control the parameter of the filter by use of a measuring result of the oscillation frequency obtained by the measuring block,
wherein the control block computes a fluctuation coefficient by use of a frequency measuring result obtained by the measuring block and a standard sample frequency measuring result, and controls the parameter of the filter by use of the computed fluctuation coefficient.
12. The communication apparatus according to claim 11 , wherein the parameter of the filter is capacitance.
13. The communication apparatus according to claim 12 , wherein the voltage-controlled oscillation block is an inductance-capacitance voltage-controlled oscillator having inductance and capacitance.
14. The communication apparatus according to claim 11 ,
wherein the measuring block measures the oscillation frequency as a channel tuning operation, and
the frequency measuring result that is used by the control block for computing the fluctuation coefficient is a result of the measuring block measuring the oscillation frequency as the channel tuning operation.
15. The communication apparatus according to claim 11 , wherein the control block controls parameters of a plurality of filters, including the filter, by use of the computed fluctuation coefficient.
16. The communication apparatus according to claim 11 , further comprising:
a mixer that is downstream of the filter and mixes the received signal with an oscillation signal output from the voltage-controlled oscillation block.
17. A communication apparatus comprising:
a receiver circuit that receives a signal;
a filter that is downstream of the receiver circuit and that extracts a portion of the received signal;
a voltage-controlled oscillator that has a parameter that is correlated with a parameter of the filter and that outputs an oscillation signal;
a mixer that is downstream of the filter and mixes the received signal with the oscillation signal;
a measuring circuit that measures an oscillation frequency of the voltage-controlled oscillator; and
a control circuit that computes a fluctuation coefficient by use of a frequency measuring result obtained by the measuring circuit and a standard sample frequency measuring result, and variably controls the parameter of the filter by using the computed fluctuation coefficient.
18. The communication apparatus of claim 17 ,
wherein the parameter of the filter is capacitance and the parameter of the voltage-controlled oscillator that is correlated with the parameter of the filter is capacitance.
19. The communication apparatus of claim 18 ,
wherein the control circuit controls the parameter of the filter by multiplying a present capacitance of the filter by the computed fluctuation coefficient and setting a new capacitance of the filter to a result of the multiplication.