JP2011176410A - Receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a receiver, capable of suppressing noise sufficiently, always maintaining required and sufficient reception sensitivity, and saving power. <P>SOLUTION: Noise (self-poisoning noise) caused by an application circuit unit is received to control the phase and amplitude, and a level of a noise component included in output after the control is measured in a desired wave signal interruption state. Then, a measured result of the noise level is compared with a prescribed threshold to determine on/off of an ANC circuit unit 105, the ANC circuit unit 105 is turned on to suppress the noise when the noise level is not less than the threshold, and the ANC circuit unit 105 is turned off when the noise level is less than the threshold, thus suppressing the noise sufficiently, always maintaining the required and sufficient reception sensitivity, and saving power. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a receiver suitable for use in a wireless terminal such as a mobile phone.

  In recent years, wireless terminals are equipped with reception functions such as wireless LAN, GPS (Global Positioning System), One Seg, FM radio, etc. in addition to digital functions such as cellular function, camera, music playback, recording, etc. Is progressing. Therefore, a lot of noise sources are mixed inside the wireless terminal, and combined with the demand for thinning and miniaturization, the noise source and the antenna of the wireless terminal are close to each other and interfere with each other, so that the cellular function, GPS, one segment, The reception sensitivity of a receiver such as an FM radio deteriorates. In addition, due to demands for thinning and miniaturization of wireless terminals, it is difficult to provide optimum shielding, and noise countermeasures adversely affect antenna characteristics, making it difficult to completely suppress noise.

  In order to solve these problems, in Patent Document 1, a request in which a noise received by a noise antenna that receives only noise inside a mobile terminal and a noise received by a wireless communication antenna used for transmission / reception of a desired wave are superimposed. There is disclosed a method for obtaining stable reception sensitivity by canceling noise by extracting a difference from a wave and extracting only a desired wave. Patent Document 2 discloses a method of intentionally generating a signal having a phase opposite to that of assumed noise and suppressing an interference wave received by an antenna.

  In Patent Document 3, an antenna that receives a radio signal from the outside, a noise sensor unit that is provided in the vicinity of a predetermined noise source in the terminal, detects noise generated from the noise source, A state detection unit for detecting a use state, a memory unit for storing a noise profile predicted to be generated in response to the use state of the own terminal, and a memory unit based on the use state of the own terminal detected by the state detection unit Obtained by selecting a noise profile from the control unit, controlling the operation of the noise sensor unit according to the selected noise profile, and shaping the noise profile determined based on the noise detected by the noise sensor unit A noise cancellation unit that takes the difference between the noise simulation signal and the radio signal received from the antenna, and the operation mode of the mobile terminal changes The method of suppressing the interference wave received by the antenna is disclosed.

  Further, in Patent Document 4, in a diversity receiver, an error correction unit that outputs a bit error rate (hereinafter referred to as “BER”), a BER determiner that outputs a determination signal by comparing BER with a preset threshold value, and A diver control unit that controls the start or stop of power supply to the tuner unit while receiving a determination signal from the BER determinator, and switching between diver reception and single reception according to the BER value reduces power consumption A method of realizing is disclosed.

JP 2004-260428 A US Pat. No. 7,123,676 JP 2008-244987 A JP 2006-31258 A

However, the conventional techniques disclosed in the above-described patent documents have the following problems.
(1) In the techniques disclosed in Patent Documents 1 and 2, since the noise source and the amount of generated noise differ depending on the operation mode and physical state of the wireless terminal, the noise suppressing effect is insufficient. Examples of the physical state include a foldable portable terminal (open / closed state, etc.), a power supply voltage, and a surrounding environment (eg, temperature, humidity, etc.).

(2) In the technique disclosed in Patent Document 3, since the noise canceling circuit is always operated, the power consumption is larger than that in the prior art. Incidentally, FIG. 10 is a flowchart showing the operation of a conventional receiver with an active noise canceller during DTV viewing. As shown in the figure, conventionally, after setting the viewing condition of DTV (Digital Television), ANC (active noise canceller) is set to ON to enter the viewing mode. In this case, power consumption increases because the ANC always operates.

(3) In the technique disclosed in Patent Document 4, when ON / OFF is determined using BER information, since comparison cannot be performed in the same propagation state, averaging is necessary, and time until ON / OFF determination is determined. long. In addition, when performing scheduled recording, the noise generated by the device itself is different before and during the recording operation, so even if it is determined that there is no problem with the reception sensitivity before the recording operation, the reception sensitivity is not satisfied during recording. There was a case.

  The present invention has been made in view of such circumstances, and provides a receiver that can sufficiently suppress noise, can always maintain sufficient reception sensitivity, and can save power. With the goal.

  The receiver according to the present invention includes a first antenna that receives a desired wave signal, a signal blocking unit that blocks the desired wave signal received by the first antenna, and a plurality of applications that execute different applications. A circuit unit, a second antenna that receives noise caused by at least one of the plurality of application circuit units, and an active noise canceller circuit that controls and outputs the phase and amplitude of the noise received by the second antenna And a receiving circuit unit that demodulates the output of the active noise canceler circuit unit, and controls the signal blocking unit during noise level measurement to block the desired wave signal, and then the level of the noise component included in the output A noise level measurement unit for measuring the noise level, and the measurement result of the noise level measurement unit is compared with a predetermined threshold to And on / off determination unit that determines Restorative noise canceller circuit unit on / off, with a.

  According to the above configuration, the noise caused by the application circuit unit is received, the phase and amplitude are controlled, and the level of the noise component included in the output after control is measured in the desired wave signal cutoff state. Then, the measurement result of the noise level is compared with a predetermined threshold value to determine whether the active noise canceler circuit unit is on or off.

  Therefore, if the noise level is equal to or higher than the threshold value, the active noise canceller circuit unit is turned on to suppress the noise, and if the noise level is less than the threshold value, the active noise canceller circuit unit is turned off to sufficiently suppress the noise. In addition, it is possible to maintain sufficient reception sensitivity as necessary, and to save power.

  The receiver according to the present invention includes a first antenna that receives a desired wave signal, a signal blocking unit that blocks the desired wave signal received by the first antenna, and a plurality of applications that execute different applications. A circuit unit, a second antenna that receives noise caused by at least one of the plurality of application circuit units, and an active noise canceller circuit that controls and outputs the phase and amplitude of the noise received by the second antenna , A state change detection unit that detects a change in the state of the receiver, and a reception circuit unit that demodulates the output of the active noise canceller circuit unit, and controls the signal cutoff unit during noise level measurement to control the desired wave signal Is measured, the level of the noise component included in the output is measured, and after the noise level is measured, the state change A noise level measurement unit that measures a noise level again when a change in the state of the receiver is detected at the output unit, and compares the measurement result of the noise level measurement unit with a predetermined threshold value to turn on / off the active noise canceller circuit unit An on / off determination unit for determining off.

  According to the above configuration, the noise caused by the application circuit unit is received, the phase and amplitude are controlled, the level of the noise component contained in the output after control is measured in the desired wave signal cutoff state, and the noise level measurement is further performed If a change in receiver status is detected later, the noise level is measured again. Then, the measurement result of the noise level is compared with a predetermined threshold value to determine whether the active noise canceler circuit unit is on or off.

  Therefore, if the noise level is equal to or higher than the threshold value, the active noise canceller circuit unit is turned on to suppress the noise, and if the noise level is less than the threshold value, the active noise canceller circuit unit is turned off to sufficiently suppress the noise. In addition, it is possible to maintain sufficient reception sensitivity as necessary, and to save power. In particular, since the noise level is measured again when the state of the receiver changes, noise can be sufficiently suppressed even when the state of the receiver changes. Note that when the state of the receiver changes, for example, when the receiver is applied to a mobile phone, when the case shape of the mobile phone casing changes such as opening or closing, the receiver Is applied to a mobile phone having a DTV reception function, such as when a channel is changed.

  The receiver according to the present invention includes a first antenna that receives a desired wave signal, a signal blocking unit that blocks the desired wave signal received by the first antenna, and a plurality of applications that execute different applications. A circuit unit, a second antenna that receives noise caused by at least one of the plurality of application circuit units, and an active noise canceller circuit that controls and outputs the phase and amplitude of the noise received by the second antenna And a receiving circuit unit that demodulates the output of the active noise canceler circuit unit, and controls the signal blocking unit during noise level measurement to block the desired wave signal, and then the level of the noise component included in the output A noise level measurement unit that measures the recording level, a device unit that operates at the time of scheduled recording, and the device according to the scheduled recording information. Equipped with a on / off determination unit for determining the on / off the active noise canceller circuit compares the measurement result of the noise level measuring unit with a predetermined threshold while operating the chair unit.

  According to the above configuration, the device unit that receives the noise caused by the application circuit unit, controls the phase and amplitude thereof, and operates the level of the noise component included in the output after the control in the desired wave signal cutoff state and the reserved recording. Measure with the operating. Then, the measurement result of the noise level is compared with a predetermined threshold value to determine whether the active noise canceler circuit unit is on or off.

  Therefore, if the noise level is equal to or higher than the threshold value, the active noise canceller circuit unit is turned on to suppress the noise, and if the noise level is less than the threshold value, the active noise canceller circuit unit is turned off to sufficiently suppress the noise. In addition, it is possible to maintain sufficient reception sensitivity as necessary, and to save power. In particular, when measuring the noise level, the active noise canceller circuit unit can be effectively operated when the scheduled recording is started because the device unit that operates during the scheduled recording is operated.

  INDUSTRIAL APPLICABILITY The present invention can provide a receiver that can sufficiently suppress noise, can always maintain sufficient reception sensitivity when necessary, and can save power.

1 is a block diagram showing a schematic configuration of a receiver according to Embodiment 1 of the present invention. Diagram showing characteristics of home poisoning noise FIG. 1 is a flowchart showing the operation of the receiver of FIG. FIG. 1 is a flowchart showing the operation of the receiver of FIG. 1 in the noise measurement mode. The flowchart which shows the operation | movement at the time of DTV viewing mode of the receiver of FIG. The block diagram which shows schematic structure of the receiver which concerns on Embodiment 2 of this invention. FIG. 6 is a flowchart showing the operation of the receiver of FIG. The block diagram which shows schematic structure of the receiver which concerns on Embodiment 3 of this invention. FIG. 8 is a flowchart showing the operation of the receiver in the noise measurement mode. Flow diagram showing the main operation of a conventional receiver with active noise canceller

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a schematic configuration of a receiver according to Embodiment 1 of the present invention. In the figure, a receiver 100 of the present embodiment includes a main antenna (first antenna) 101 that receives a desired wave signal, a noise receiving antenna (second antenna) 102 that receives noise, and a main antenna 101. The signal blocker 103 that blocks the received signal received at the low-noise amplifier 104 that amplifies the received signal received by the main antenna 101, and the phase and amplitude of the noise signal received by the noise receiving antenna 102 are varied. An ANC (Active Noise Canceller) circuit unit 105 that outputs a synthesized signal with a received signal (desired signal) amplified by the low noise amplifier 104, and a signal demodulated from the signal output from the ANC circuit unit 105 The ANC circuit unit 105 is turned on based on the reception circuit unit 106 and the noise level measured by the reception circuit unit 106. An ON / OFF determination unit 107 that determines OFF, an ANC control unit 108 that controls the phase, gain (gain), and power supply of the ANC circuit unit 105 according to the input signal, and a mode that sets the reception mode of the receiver A setting unit 109.

  The ANC circuit unit 105 includes a synthesis unit 120, a variable phase unit 121, and a variable gain unit 122. The reception circuit unit 106 includes a frequency conversion unit 130, a filter 131, a variable gain unit 132, a demodulation unit 133, a detection unit (noise level measurement unit) 134 that detects a signal input to the demodulation unit 133, a frequency A local frequency generation unit 135 that generates a local frequency input to the conversion unit 130.

  In general, noise generated from the electronic device itself (so-called “self-poisoning noise”) has frequency characteristics. The source of self-addictive noise is an application circuit unit such as a Bluetooth (registered trademark) circuit unit or a Felica (registered trademark) circuit unit. The application circuit unit includes a transmitter that outputs a reference clock for starting an application, and this transmitter is a noise generation source. Note that Bluetooth is a short-range wireless communication standard for digital electronic devices, and is used for wireless communication between devices at a distance of several meters to several tens of meters. 2.4 GHz band radio waves are used. On the other hand, Felica is a non-contact IC card technology and is widely used in transportation tickets and electronic money systems. Radio waves in the 13.56 MHz band are used.

  FIG. 2 shows an example of characteristics of self-poisoning noise. In the figure, the x-axis is frequency and the y-axis is signal level. A dotted line is a receiver sensitivity point of the receiver, and CH1 to CH10 are receiver channels. Channels that do not satisfy the reception sensitivity specification due to self-poisoning noise are CH2, CH3, CH4, CH6, and CH8, and other channels are hardly affected by self-poisoning noise. However, even in the same model, the characteristics of self-poisoning noise are often different due to variations in the components for high-frequency signals, and there are also changes over time.

  The mode setting unit 109 activates the reception circuit unit 106 when a reception request is made (DTV is on). Reception setting information (DTV viewing request, reception CH information) is input to the mode setting unit 109. The local frequency generating unit 135 in the receiving circuit unit 106 is set to the frequency of the CH from the received CH information.

  In the noise measurement mode, the mode setting unit 109 controls the signal blocking unit 103 via the receiving circuit unit 106 to prevent the signal from the main antenna 101 from being sent to the receiving circuit unit 106. And the gain of the low noise amplifier 104 is set to a minimum value (power off). Further, the mode setting unit 109 controls the ANC control unit 108 to set the gain of the variable gain unit 122 built in the ANC circuit unit 105 to the maximum value, and “internal noise” received by the noise receiving antenna 102. Amplify. The “internal noise” amplified by the ANC circuit unit 105 is frequency-converted by the frequency conversion unit 130 of the reception circuit unit 106, and then only the noise component in the channel band is extracted by the filter 131. Then, the level is variable by the variable gain unit 132 and input to the demodulation unit 133. The level of the noise input to the demodulation unit 133 is measured by the detection unit 134 of the demodulation unit 133, and the measurement result is output to the on / off determination unit 107.

  The on / off determination unit 107 compares the measurement result of the noise level measured by the detection unit 134 with a preset threshold value, and outputs the comparison result to the mode setting unit 109. If the noise level measured by the detection unit 134 of the demodulation unit 133 is equal to or higher than the threshold, the mode setting unit 109 gives a command to turn on the circuit power of the ANC circuit unit 105 to the ANC control unit 108 and shifts to the viewing mode. On the other hand, if the noise level measured by the detection unit 134 is less than the threshold value, the ANC control unit 108 is instructed to turn off the circuit power supply of the ANC circuit unit 105 and shifts to the viewing mode.

  In the viewing mode, the mode setting unit 109 controls the signal blocking unit 103 via the receiving circuit unit 106 to input the signal from the main antenna 101 to the low noise amplifier 104 and to set the gain of the low noise amplifier 104 to the reception level. Set to the optimum value according to the. The demodulation unit 133 of the reception circuit unit 106 outputs demodulated data.

  As an operation of the ANC circuit unit 105 when the ANC is on, for example, the ANC control unit 108 reads register information of the reception circuit unit 106, recognizes information such as SNR (Signal to Noise Ratio), and based on this information, the main antenna The variable phase unit 121 and the variable gain unit 122 are controlled so that the synthesizer 120 cancels the self-addicting noise input to 101.

Next, the operation of the receiver 100 of this embodiment will be described.
FIG. 3 is a flowchart showing the operation of the receiver 100 during DTV viewing. In the figure, after setting the viewing condition of the DTV, the self-addiction noise level at the viewing condition is measured in the “noise measurement mode” (step 1), and if the measured noise level is a predetermined value or more, the ANC circuit unit 105 is turned on to enter the DTV viewing mode, and if the noise level is less than a certain value, the ANC circuit unit 105 is turned off to enter the DTV viewing mode (step 2).

  FIG. 4 is a flowchart showing the operation of the receiver 100 in the noise measurement mode. In the same figure, the signal blocking unit 103 directly under the main antenna 101 is controlled to block the signal from the main antenna 101 by controlling the signal blocking unit 103 so that the signal from the main antenna 101 does not go to the receiving circuit unit 106. (Step 10). Next, the gain of the low noise amplifier 104 is set to a minimum value (power supply off) (step 11). Further, the gain of the variable gain unit 122 of the ANC circuit unit 105 is maximized (step 12). After setting the gain of the variable gain unit 122 to the maximum, the variable gain unit 132 is set to an optimum value, and the noise level is measured by the detection unit 134 of the receiving circuit unit 106 (step 13). That is, the electric field strength of noise is measured.

  After measuring the noise level, the measured noise level is compared with a threshold (step 14). If the noise level is equal to or higher than the threshold, the ANC circuit unit 105 is turned on (step 15). Turn off (step 16). After performing the process of either step 15 or step 16, the noise measurement mode is terminated.

  FIG. 5 is a flowchart showing the operation of the receiver 100 in the DTV viewing mode. In the same figure, the signal blocking unit 103 directly under the main antenna 101 is controlled to control the signal blocking unit 103 so that the signal from the main antenna 101 goes to the receiving circuit unit 106 to pass the signal from the main antenna 101. (Step 20). Next, the gain of the low noise amplifier 104 is set to an optimum value according to the reception level (step 21). Then, the reception circuit unit 106 demodulates the reception signal (step 22).

  As described above, according to the receiver 100 of the present embodiment, the noise (self-poisoning noise) caused by the application circuit unit (not shown) is received, the phase and amplitude are controlled, and included in the output after control. Measure the level of the noise component that is generated when the desired signal is cut off. Then, the measurement result of the noise level is compared with a predetermined threshold value to determine whether the ANC circuit unit 105 is on or off. If the noise level is equal to or higher than the threshold value, the ANC circuit unit 105 is turned on to suppress the noise, If the noise level is less than the threshold value, the ANC circuit unit 105 is turned off. By performing this control every time a channel is selected, noise can be sufficiently suppressed, and sufficient reception sensitivity can be maintained whenever necessary, and power saving can be achieved.

(Embodiment 2)
FIG. 6 is a block diagram showing a schematic configuration of a receiver according to Embodiment 2 of the present invention. In the figure, the same reference numerals are given to the portions common to FIG. 1 described above, and the description thereof is omitted.

  The receiver 200 according to the present embodiment includes a state change detection unit 201 that detects a change in use state such as closing and opening of the housing of the receiver 200. When the state change detection unit 201 detects a state change in the DTV viewing mode, the mode setting unit 109 shifts to the noise measurement mode. Note that the state change includes ON / OFF of application circuit units such as a Felica circuit unit and a Bluetooth circuit unit other than the DTV.

  FIG. 7 is a flowchart showing the operation of the receiver 200 during DTV viewing. In the figure, after setting the viewing condition of the DTV, the self-addiction noise level at the viewing condition is measured in the “noise measurement mode” (step 1), and if the measured noise level is a predetermined value or more, the ANC circuit unit 105 is turned on to enter the DTV viewing mode, and if the noise level is less than a certain value, the ANC circuit unit 105 is turned off to enter the DTV viewing mode (step 2). It is determined whether there is a state change during the DTV viewing mode, that is, a housing state (closed, opened) change, viewing CH, application other than DTV (Ferica, Bluetooth, etc.) state change, and if there is no state change, return to Step 2 The DTV viewing mode is continued, and if there is a state change, the process returns to step 1 to perform the noise measurement mode processing. As a result, even when the characteristics of the self-poisoning noise that jumps into the noise receiving antenna 102 due to a change in the housing or the like, noise measurement is performed again, and when the noise level is low, the power consumption can be reduced.

  As described above, according to the receiver 200 of the present embodiment, noise (self-poisoning noise) caused by an application circuit unit (not shown) is received and its phase and amplitude are controlled and included in the output after control. The level of the noise component to be measured is measured in the desired wave signal cutoff state, and when the change in the state of the receiver is detected after the noise level measurement, the noise level is measured again. Then, the noise level measurement result is compared with a predetermined threshold value to determine whether the active noise canceller circuit unit 105 is on or off. If the noise level is equal to or higher than the threshold value, the active noise canceller circuit unit 105 is turned on to suppress the noise. If the noise level is less than the threshold value, the active noise canceller circuit unit 105 is turned off. As a result, noise can be sufficiently suppressed, sufficient reception sensitivity can be maintained as necessary, and power saving can be achieved. In particular, since the noise level is measured again when the state of the receiver changes, noise can be sufficiently suppressed even when the state of the receiver 200 changes.

(Embodiment 3)
FIG. 8 is a block diagram showing a schematic configuration of a receiver according to Embodiment 3 of the present invention. In the figure, the same reference numerals are given to the portions common to FIG. 1 described above, and the description thereof is omitted.

  The receiver 300 of this embodiment includes a pseudo control unit 301 that can control the SD memory control unit 302 with respect to FIG. The SD memory control unit (device unit) 302 writes and reads data to and from an SD memory (registered trademark) which is a kind of flash memory. In the present embodiment, recording is performed on this SD memory.

  In general, it has been found that the self-poisoning noise level increases when accessing the SD memory. If noise is measured during recording, data loss occurs, which is disadvantageous for the user. In the present embodiment, at the time of scheduled recording, the ANC circuit unit 105 can be accurately determined on / off by measuring the noise level in the pseudo recording state before starting the recording. As a result, even during scheduled recording, the same noise measurement as the actual operation is performed in advance, and when the noise level is high, the reception sensitivity can be increased by the ANC operation, and when the noise level is low, the power consumption can be reduced. it can.

  FIG. 9 is a flowchart showing the operation of the receiver 300 in the noise measurement mode. In the same figure, the signal blocking unit 103 directly under the main antenna 101 is controlled to block the signal from the main antenna 101 by controlling the signal blocking unit 103 so that the signal from the main antenna 101 does not go to the receiving circuit unit 106. (Step 30). Next, the gain of the low noise amplifier 104 is set to the minimum value (power supply off) (step 31). Then, it is determined whether it is viewing or reserved recording (step 32). If it is reserved recording, pseudo recording is set to see how noise is generated by operating the SD memory control unit 302, and data is stored in the SD memory. Writing is performed (step 33). After writing data to the SD memory, the gain of the variable gain unit 122 of the ANC circuit unit 105 is maximized (step 34).

  On the other hand, in the case of viewing in the determination of step 32, no processing is performed and the process proceeds to step 34. After the gain of the variable gain unit 122 is set to the maximum in step 34, the noise level is measured by the detection unit 134 of the receiving circuit unit 106 (step 35). That is, the electric field strength of noise is measured. In the noise level measurement, when noise is generated by operating the SD memory control unit 302, the noise level including the noise is measured.

  After measuring the noise level, it is determined again whether it is viewing or reserved recording (step 36). If it is reserved recording, the pseudo recording setting is canceled and writing of data to the SD memory is stopped (step 37). After canceling the pseudo recording setting, the noise level measured by the detection unit 134 is compared with a threshold value (step 38). If the noise level is equal to or higher than the threshold value, the ANC circuit unit 105 is turned on (step 39). If there is, the ANC circuit unit 105 is turned off (step 40). After performing the process of either step 39 or step 40, the noise measurement mode is terminated. If it is determined in step 36 that the user is viewing, no processing is performed and the process proceeds to step 38.

  As described above, according to the receiver 300 of the present embodiment, noise (self-poisoning noise) caused by an application circuit unit (not shown) is received and its phase and amplitude are controlled and included in the output after control. The level of the noise component to be measured is measured in a state where the desired wave signal is cut off and the SD memory control unit 302 which is operated at the time of reserved recording is operated. Then, the noise level measurement result is compared with a predetermined threshold value to determine whether the active noise canceller circuit unit 105 is on or off. If the noise level is equal to or higher than the threshold value, the active noise canceller circuit unit 105 is turned on to suppress the noise. If the noise level is less than the threshold value, the active noise canceller circuit unit 105 is turned off. As a result, noise can be sufficiently suppressed, sufficient reception sensitivity can be maintained as necessary, and power saving can be achieved. In particular, when the noise level is measured, since the SD memory control unit 302 that operates at the time of reserved recording is operated, the active noise canceller circuit unit 105 can be effectively operated when the reserved recording is started.

  INDUSTRIAL APPLICABILITY The present invention can sufficiently suppress noise, can always maintain sufficient reception sensitivity when necessary, and has an effect of saving power, and can be applied to a small wireless device such as a mobile phone. Is possible.

100, 200, 300 Receiver 101 Main antenna 102 Noise receiving antenna 103 Signal blocking unit 104 Low noise amplifier 105 ANC circuit unit 106 Reception circuit unit 107 On / off determination unit 108 ANC control unit 109 Mode setting unit 120 Combining unit 121 Variable phase Unit 122 variable gain unit 130 frequency conversion unit 131 filter 132 variable gain unit 133 demodulation unit 134 detection unit 135 local frequency generation unit 201 state change detection unit 301 pseudo control unit 302 SD memory control unit

Claims (3)

A first antenna for receiving a desired wave signal;
A signal blocking unit that blocks the desired wave signal received by the first antenna;
A plurality of application circuit units that execute different applications;
A second antenna for receiving noise caused by at least one of the plurality of application circuit units;
An active noise canceller circuit unit that controls and outputs the phase and amplitude of the noise received by the second antenna;
Provided in the receiving circuit unit that demodulates the output of the active noise canceller circuit unit, controls the signal blocking unit at the time of noise level measurement to block the desired wave signal, and then measures the level of the noise component included in the output A noise level measurement unit;
An on / off determination unit that compares the measurement result of the noise level measurement unit with a predetermined threshold value to determine on / off of the active noise canceller circuit unit;
With receiver. A first antenna for receiving a desired wave signal;
A signal blocking unit that blocks the desired wave signal received by the first antenna;
A plurality of application circuit units that execute different applications;
A second antenna for receiving noise caused by at least one of the plurality of application circuit units;
An active noise canceller circuit unit that controls and outputs the phase and amplitude of the noise received by the second antenna;
A state change detector for detecting a change in the state of the receiver;
Provided in the receiving circuit unit that demodulates the output of the active noise canceler circuit unit, controls the signal blocking unit at the time of noise level measurement to block the desired wave signal, and then measures the level of the noise component included in the output A noise level measurement unit that measures the noise level again when a state change of the receiver is detected by the state change detection unit after the noise level measurement,
An on / off determination unit that compares the measurement result of the noise level measurement unit with a predetermined threshold value to determine on / off of the active noise canceller circuit unit;
With receiver. A first antenna for receiving a desired wave signal;
A signal blocking unit that blocks the desired wave signal received by the first antenna;
A plurality of application circuit units that execute different applications;
A second antenna for receiving noise caused by at least one of the plurality of application circuit units;
An active noise canceller circuit unit that controls and outputs the phase and amplitude of the noise received by the second antenna;
Provided in the receiving circuit unit that demodulates the output of the active noise canceller circuit unit, controls the signal blocking unit at the time of noise level measurement to block the desired wave signal, and then measures the level of the noise component included in the output A noise level measurement unit;
A device part that operates during scheduled recording,
An on / off determination unit that determines whether the active noise canceller circuit unit is on or off by comparing the measurement result of the noise level measurement unit with a predetermined threshold in a state in which the device unit is operated according to scheduled recording information;
With receiver.

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