JP2009246938A - Noise canceler, and high-frequency receiver and portable device each using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent degradation in television reception sensitivity due to a noise signal caused by a noise signal source in a portable device. <P>SOLUTION: A noise canceler includes: a pickup antenna 133 which is disposed closely to the noise occurrence source and extracts the noise signal output from, for example, an image forming unit 115 as the noise occurrence source; a noise canceling unit 137a which inputs a television signal from a television receiving antenna 117a, and is supplied with the noise signal extracted by the pickup antenna 133, and a noise canceling unit 137b which is supplied with a television signal from a television receiving antenna 117b, and also supplied with the noise signal extracted by the pickup antenna 133. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention has an image display unit such as a mobile phone, a portable game machine, a portable computer, a portable dictionary, etc. The present invention relates to a mobile device to be displayed.

  In recent years, the above-mentioned portable devices are very light and have been miniaturized because of the miniaturization of parts and the integration of semiconductor elements. For this reason, attempts are being made to enhance the functions of mobile devices.

  Accordingly, the portable device has functions such as a cellular phone, a portable game machine, a portable computer, a portable dictionary, and the like, and can also watch TV broadcasts.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2008-22294 A

  However, in a conventional portable device, a clock signal output from the portable device or a part of its harmonic signal becomes a noise signal source and enters from a television receiving antenna.

  In particular, in terrestrial digital television broadcasting, transmission power is reduced in consideration of interference with reception of existing analog broadcasting. For this reason, when receiving a terrestrial digital TV, if the radio wave condition is poor, the reception sensitivity is deteriorated, and the TV broadcast cannot be viewed.

  Therefore, an object of the present invention is to suppress the influence of the clock signal of a portable device and a part of its harmonic signal on the reception sensitivity at the time of television broadcast reception.

  In order to achieve this object, a noise canceling apparatus according to the present invention is arranged close to a noise generation source and extracts a noise signal output from the noise generation source, and a first television reception A first noise canceling unit in which a TV signal from an antenna is supplied to a first input and the noise signal extracted by the pickup antenna is supplied to a second input, and a second TV receiving antenna A second noise canceling unit is provided in which the TV signal is supplied to the third input and the noise signal extracted by the pickup antenna is supplied to the fourth input.

  This achieves the intended purpose.

  As described above, the noise canceling device of the present invention is disposed near the noise generation source and extracts the noise signal output from the noise generation source, and the first television reception antenna. A TV signal from a second TV receiving antenna and a first noise canceling unit in which a TV signal is supplied to a first input and the noise signal extracted by the pickup antenna is supplied to a second input Is supplied to the third input, and a second noise canceling unit is provided in which the noise signal extracted by the pickup antenna is supplied to the fourth input.

  Thereby, even if the noise signal output from the noise signal source jumps into the first and second television receiving antennas, the noise signal can be greatly suppressed by the first and second noise canceling units.

  Accordingly, it is possible to greatly improve the reception sensitivity when receiving a television broadcast.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a block diagram of the mobile device 101. In the embodiment of the present invention, a portable device 101 capable of receiving a digital television signal will be described as an example.

  The portable device 101 includes a high-frequency receiving unit 103 that receives a digital broadcast television signal, a main unit 105 having functions of a mobile phone, a portable game machine, a portable computer, a portable dictionary, and the like. A baseband signal processing unit 107 to which an output of the high-frequency receiving unit 103 and an output of the main body unit 105 are connected, an image display unit 109 to which a signal from the baseband signal processing unit 107 is supplied, an audio output unit 111, , A baseband signal processing unit 107, a high frequency receiving unit 103, and a system control unit 113 that controls the main body unit 105.

  In addition, the baseband signal processing unit 107 and the system control unit 113 constitute an image forming unit 115.

  The high-frequency receiving unit 103 is provided with input terminals 119a and 119b to which television signals from the television receiving antennas 117a and 117b are respectively supplied, and an output terminal 121 from which a transport stream (PS) signal is output.

  In order from the input terminal 119a to the output terminal 121, an antenna matching unit 122a that matches the input impedance of the television receiving antenna 117a, a high-frequency amplifier 123a that amplifies a high-frequency signal, and an output signal from the high-frequency amplifier 123a is one input. A synthesizing circuit 125a supplied to 126a, a tuner demodulator 127a to which an output 126e of the synthesizing circuit 125a is connected, and an output from the tuner demodulator 127a is supplied to one input 131a, and error correction and decoding (decoding ) Is connected to the diversity decoder 131.

  The antenna matching unit 122a and the high frequency amplifier 123a constitute an antenna matching unit 132a.

  Further, the output of the cancel signal generation circuit 135a is connected to the input 126c of the synthesis circuit 125a. A noise signal from the pickup antenna 133 is input to the cancel signal generation circuit 135a via the input terminal 134a and the wiring section 134.

  The cancel signal generation circuit 135a and the synthesis circuit 125a constitute a noise cancellation unit 137a.

  Similarly, in order from the input terminal 119b to the output terminal 121, an antenna matching unit 122b that matches the input impedance of the television receiving antenna 117b, a high-frequency amplifier 123b that amplifies a high-frequency signal, and an output signal from the high-frequency amplifier 123b is one side. The synthesizing circuit 125b supplied to the input 126b, the tuner demodulating unit 127b to which the output 126f of the synthesizing circuit 125b is connected, the output from the tuner demodulating unit 127b being supplied to the other input 131b and error correction and decoding A diversity decoding unit 131 that performs the signal processing is connected.

  The antenna matching unit 122b and the high frequency amplifier 123b constitute an antenna matching unit 132b.

  Furthermore, the output of the cancel signal generation circuit 135b is connected to the input 126d of the synthesis circuit 125b. A noise signal from the pickup antenna 133 is input to the cancel signal generation circuit 135b.

  The cancel signal generation circuit 135b and the synthesis circuit 125b constitute a noise cancellation unit 137b.

  In the synthesis circuit 125a, an input 126a and an output 126e are connected by a signal line, and an amplifier having a high output impedance is provided from the input 126c toward the signal line. Thereby, the influence on the high frequency signal by the cancel signal generation circuit 135a can be reduced. The same applies to the synthesis circuit 125b.

  Further, the tuner demodulator 127a is provided with a high-frequency amplifier 128a, a mixer 130a, and a demodulator 130c (both not shown) capable of controlling gain at least in order from the input to the output.

  Similarly, the tuner demodulator 127b is provided with a high-frequency amplifier 128b capable of gain control, a mixer 130b, and a demodulator 130d (both not shown) in order from the input to the output.

  Note that the noise canceling unit 138 includes the noise canceling units 137a and 137b and the pickup antenna 133.

  The operation of the mobile device 101 configured as described above will be described below with reference to FIG.

  First, operations of the main body unit 105, the image forming unit 115, the image display unit 109, and the audio output unit 111 will be described. The main body 105 has functions of a mobile phone, a portable game machine, a portable computer, a portable dictionary, and the like. For example, a baseband signal output from the main body unit 105 is input to the baseband signal processing unit 107.

  The main body unit 105, the baseband signal processing unit 107, and the image display unit 109 are controlled by the system control unit 113. The video signal output from the baseband signal processing unit 107 is displayed as an image by the image display unit 109, and the audio signal output from the baseband signal processing unit 107 is converted into audio by the audio output unit 111. .

  Next, the operation of the high frequency receiving unit 103 will be described. For example, digital broadcast signals received by the television receiving antennas 117a and 117b are input to the antenna matching units 132a and 132b, respectively.

  The antenna matching units 132a and 132b are configured by antenna matching units 122a and 122b provided on the input side, respectively, and subsequent high-frequency amplifiers 123a and 123b. Thereby, even the short television receiving antennas 117a and 117b improve the reception sensitivity and achieve impedance matching.

  Further, the noise canceling sections 137a and 137b cancel the phase of unnecessary noise signals. The phase-cancelled signals are input to tuner demodulation units 127a and 127b, gain controlled, frequency converted by a mixer, and further demodulated.

  This demodulated signal is input to diversity decoder 131. The diversity decoding unit 131 selects single reception or diversity reception by selecting or combining one of the demodulated signals from the tuner demodulation units 127a and 127b, and further decodes the received signal.

  The transport stream (TS) signal output from the diversity decoding unit 131 is output from the output terminal 121.

  This TS signal is input to the baseband signal processing unit 107, and a video signal and an audio signal are output from the baseband signal processing unit 107, and further input to the image display unit 109 and the audio output unit 111.

  Further, the system control unit 113 selects the reception channel of the high frequency reception unit 103 and further controls the tuner demodulation units 127a and 127b and the diversity decoding unit 131 to improve reception quality. In this way, television signals can be received mainly by the high-frequency receiving unit 103, the image forming unit 115, the image display unit 109, and the audio output unit 111.

  However, the high-frequency receiving unit 103 that can receive the television signal is used in a mobile phone, a portable game machine, a portable computer, a portable dictionary, or the like. In addition, the size of the portable device is increasingly reduced.

  As described above, as a result of the enhancement of functions as a portable device and further downsizing, for example, the harmonic signals of the respective clock signals for controlling the image forming unit 115 and the image display unit 109, or the harmonics of the oscillator The signal may adversely affect the reception sensitivity when receiving a television broadcast.

  That is, the frequency of the harmonic signal of these clock signals or the harmonic signal of the oscillator may coincide with the frequency of the UHF television signal.

  In particular, in the so-called one-segment broadcasting that has recently started, the power of the transmission signal is set to be small considering the interference with the analog signal, so when watching a TV broadcast in a weak electric field area where the reception level of the broadcast wave is low, The influence of the clock signal from the portable device and the harmonic signal of the oscillator is large, and the reception sensitivity may be deteriorated.

  The operation of the noise cancellation units 137a and 137b for improving the reception sensitivity in this weak electric field region will be described. A pickup antenna 133 is connected to each of the noise cancellation units 137a and 137b. A noise signal is picked up by the pickup antenna 133. The noise signal is subjected to phase adjustment and level adjustment in the cancel signal generation circuits 135a and 135b, and is input to the input 126c of the synthesis circuit 125a and the input 126d of the synthesis circuit 125b, respectively, as a noise cancellation signal.

  These noise cancellation signals are adjusted so as to be signals having the same amplitude and inverted phase with respect to the noise signals input from the inputs 126a and 126b. By these noise cancel signals, the noise signals input from the inputs 126a and 126b are phase canceled. Further, for example, the diversity decoding unit 131 can detect and determine the reception quality of BER or C / N.

  As described above, the system control unit 113 repeats the phase cancellation operation in the noise cancellation units 137a and 137b and the detection / determination operation in the diversity decoding unit 131. As a result, the amplitude and phase of the output signals from the cancel signal generation circuits 135a and 135b can be finally adjusted to optimum values.

  As described above, according to the present invention, even when a noise signal including the clock signal of the mobile device 101 or a harmonic signal thereof enters from the television receiving antennas 117a and 117b during reception of the television signal, the noise canceling unit 137a, It can be canceled by 137b.

  Thereby, the high frequency receiving part 103 which can improve the receiving sensitivity of the television signal in a weak electric field area | region is realizable.

  In addition, by adopting this high-frequency receiving unit in a portable device, it is possible to prevent deterioration in reception sensitivity of a television signal due to a harmonic signal having a clock frequency generated from the portable device 101.

  Note that noise signals are disturbed when they enter the television receiving antennas 117a and 117b. When the reception signal that is a desired channel of the television receiving antennas 117a and 117b is small, the reception sensitivity deteriorates. .

  For example, it is possible to control operation start and operation stop of the noise cancellation units 137a and 137b based on the reception quality signal output from the tuner demodulation units 127a and 127b or the diversity decoding unit 131. As this reception quality signal, for example, BER or C / N may be used.

  Further, the noise canceling unit 137a is connected to the input of the gain control high frequency amplifier 128a (not shown) built in the tuner demodulating unit 127a, and the noise canceling unit 137b is built in the tuner demodulating unit 127b. The same effect can be obtained even if the connection is made until the input of the high frequency amplifier 128b (not shown) for gain control.

  Further, the noise canceling unit 137a is connected between the output of the gain control high-frequency amplifier 128a (not shown) built in the tuner demodulation unit 127a and the input of the mixer 130a (not shown). The cancel unit 137b may be connected between the output of the gain control high-frequency amplifier 128b (not shown) built in the tuner demodulation unit 127b and the input of the mixer 130b (not shown).

  In this case, since the degradation of the noise figure of the high frequency receiving unit 103 due to the insertion loss and matching loss of the noise cancellation units 137a and 137b can be reduced, the degradation of the reception sensitivity is small.

  FIG. 2 is a layout diagram of each block of the mobile device 101 of the present invention. The right view of this layout diagram represents a perspective view seen from the top, and the left view represents the perspective view from the side.

  In FIG. 2, the high frequency receiving unit 103 and television receiving antennas 117a and 117b are arranged on the upper surface 143a of the substrate 143 provided in the case 141, and the image forming unit 115 is arranged on the lower surface 143b. Further, an image display unit 109 is provided above the upper surface 143 a of the substrate 143.

  Here, the television receiving antennas 117a and 117b are arranged as far as possible from the image forming unit 115 and the image display unit 109, which are noise signal sources.

  The television receiving antenna 117a is built in along the longitudinal length 101a of the case 141. This is because the length 118a of the television receiving antenna 117a is 10 cm to 15 cm, which is a quarter wavelength of the UHF signal, and is smaller than the longitudinal length 101a of the case 141 and larger than the lateral length 101b. . Thus, the reception sensitivity of the television receiving antenna 117a can be secured by storing the television receiving antenna 117a in the vertical direction.

  On the other hand, the television receiving antenna 117b is disposed at a right angle to the television receiving antenna 117a. Since the television receiving antenna 117b is housed in the horizontal direction, the reception sensitivity is lower than that of the television receiving antenna 117a.

  Diversity reception is enabled by the two television receiving antennas 117a and 117b.

  Note that one or both of the television receiving antennas 117 a and 117 b may be provided on the lower surface of the substrate 143.

  What is important here is that the pickup antenna 133 is disposed close to the image forming unit 115 which is one of noise signal sources, for example.

  For example, since the image forming unit 115 is provided on one surface of the substrate 143 and the pickup antenna 133 is provided close to the other surface, a noise signal from the pickup antenna 133 can be reliably picked up.

  The pickup antenna 133 and the cancel signal generation circuits 135a and 135b are connected by a wiring unit 134 such as a print pattern. However, if the wiring section 134 is long, a television signal flows into the wiring section 134 and the television signal is canceled by the noise canceling sections 137a and 137b, resulting in a deterioration in reception sensitivity. Resulting in.

  This can be improved by shielding the wiring part 134, for example. Further, this can be improved by connecting a high-frequency amplifier 136 (not shown) between the pickup antenna 133 and the cancel signal generation circuits 135a and 135b and close to the output of the pickup antenna 133.

  That is, even if a television signal flows into the wiring part 134, the noise signal from the pickup antenna 133 amplified by the high-frequency amplifier 136 can be made larger than the noise signal that flows from the wiring part 134.

  As a result, the system control unit 113 can control the reception channels of the tuner demodulation units 127a and 127b, and can further optimize the phases and gains of the cancel signal generation circuits 135a and 135b.

  The optimized phase and gain data is stored in the system control unit 113 for each channel. At the next reception, the stored data can be used to optimize the phase and gain of the noise cancellation units 137a and 137b, so that a desired channel can be clearly received in a short time.

  FIGS. 3A and 3B show an example of an embodiment of the pickup antenna 133. FIG. 3A shows a case where a chip inductor pickup antenna 237 is used as the pickup antenna 133.

  In this way, the pickup antenna 237 is arranged close to the noise signal source, and the winding axis direction of the winding 239 of the pickup antenna 237 is the progress of the noise signal output from the image forming unit 115 which is a noise signal source, for example. Match the direction.

  Thereby, the magnetic coupling between the pickup antenna 237 and the noise signal source can be strengthened. Therefore, the noise signal level by the pickup antenna 237 can be increased. Further, the television signal reception level can be further reduced by using a small-sized chip inductor.

  For this reason, the noise cancellation units 137a and 137b can cancel the noise signal flowing in from the television receiving antennas 117a and 117b, and are not affected by the television reception signal received by the pickup antenna 237. As a result, the reception sensitivity does not deteriorate even in a weak electric field region.

  FIG. 3B shows a case where a pickup antenna 238 having a spiral print pattern is used as the pickup antenna 133.

  Further, the pickup antenna 238 is disposed close to the noise signal source, and the winding axis direction of the pickup antenna 238 is made to coincide with the traveling direction of the noise signal output from the image forming unit 115 which is the noise signal source, for example.

  Thereby, the magnetic field coupling between the pickup antenna 238 and the noise signal source can be strengthened, so that the noise signal level can be increased. Further, the television signal reception level can be set to be smaller by using a print pattern having a small size.

  For this reason, the noise cancellation units 137a and 137b can cancel the noise signal flowing in from the television receiving antennas 117a and 117b, and are not affected by the television reception signal received by the pickup antenna 238. As a result, the reception sensitivity does not deteriorate even in a weak electric field region.

  The spiral pickup antenna 238 has the same effect as a printed pattern of one turn or less.

  The pickup antenna 133 may be a microstrip line, for example. This microstrip line is composed of a signal line and a ground portion provided in the vicinity of the signal line, and may be arranged in the order of the signal line and the ground portion in the vicinity of the noise signal source.

  FIG. 4 shows another embodiment of the present invention. The high-frequency receiving unit 162 of the portable device 161 is different from the high-frequency receiving unit 103 of the portable device 101 in that both terminals of the pickup antenna 229 and the noise canceling units 137a and 137b. Are connected by wiring portions 230a and 230b having a balanced circuit.

  The pickup antenna 229 is provided in the vicinity of the image forming unit 115 which is one of noise signal generation sources, for example. In addition, the noise canceling unit 165 includes the noise canceling units 137a and 137b, the wiring units 230a and 230b, and the pickup antenna 229.

  In FIG. 4, both ends of the pickup antenna 229 are connected to input terminals 231a and 231b. The input terminals 231a and 231b are balancedly input to the cancel signal generation circuits 135a and 135b respectively incorporated in the noise cancellation units 137a and 137b via the wiring units 230a and 230b which are balanced circuits.

  In this way, both terminals of the pickup antenna 229 and the cancel signal generation circuits 135a and 135b are connected by the wiring sections 230a and 230b having a balanced circuit, so that, for example, the TV signal is a balanced circuit wiring section 230a and 230b. If you jump in, you will be cancelled.

  That is, since the influence of the television signal reception level on the wiring sections 230a and 230b can be reduced, the noise signal level at the pickup antenna 229 can be increased.

  As a result, the television signal whose noise has been canceled by the noise cancellation units 137a and 137b is not affected by the television reception signal received by the pickup antenna 229.

  Further, by connecting a high-frequency amplifier 136a (not shown) with balanced input and balanced output between the pickup antenna 229 and the cancel signal generation circuits 135a and 135b and in close proximity to the output of the pickup antenna 229, The level of the noise signal input to the noise cancellation units 137a and 137b can be increased.

  5A and 5B show an example of an embodiment as the pickup antenna 229. FIG.

  In FIG. 5A, a chip inductor pickup antenna 254 is used as the pickup antenna 229, and the winding axis direction of the winding 255 of the pickup antenna 254 coincides with the traveling direction of the noise signal output from the noise signal generation source. Let Thereby, magnetic field coupling can be further strengthened.

  Further, both ends of the pickup antenna 254 are connected to the input terminals 231a and 231b of the cancel signal generation circuits 135a and 135b by wiring portions 254a and 254b which are balanced circuits.

  Thus, the television signal whose noise is canceled by the noise canceling units 137a and 137b is not affected by the television reception signal received by the pickup antenna 254.

  In FIG. 5B, a spiral printed pattern pickup antenna 257 is used as the pickup antenna 229, and the winding axis direction of the pickup antenna 257 is made to coincide with the traveling direction of the noise signal output from the noise signal generation source. . Thereby, magnetic field coupling can be further strengthened.

  Further, both ends of the pickup antenna 257 are connected to balanced inputs of the cancel signal generation circuits 135a and 135b by wiring portions 257a and 257b of the balanced circuit.

  Thus, the television signal whose noise is canceled by the noise canceling units 137a and 137b is not affected by the television reception signal received by the pickup antenna 257.

  It should be noted that the effect is the same even if the spiral pickup antenna 257 is a printed pattern of one turn or less.

  The pickup antenna 257 may be a microstrip line, for example. This microstrip line is composed of a signal line and a ground portion provided in the vicinity of the signal line, and may be arranged in the order of the signal line and the ground portion in the vicinity of the noise signal source.

  FIG. 6 shows another embodiment of the present invention. In the portable device 301, the tip 333 a of the pickup antenna 333 is grounded near the image forming unit 115, which is one of noise signal sources, with respect to the portable device 101. The connection point is different.

  Thereby, since the grounds are shared, the noise signal component from the image forming unit 115 can be reliably picked up. In addition, since the impedance of the pickup antenna 333 can be sufficiently reduced, a television signal is not received.

  7A and 7B show another embodiment of the pickup antenna 333 used in FIG.

  In FIG. 7A, a chip inductor pickup antenna 355 is used as the pickup antenna 333.

  In this pickup antenna 355, the pickup antenna 254 in FIG. 5A has wiring portions 254a and 254b in a balanced circuit, whereas the pickup antenna 355 has a tip portion 360 as one of noise signal sources. The difference is that it is connected to the ground adjacent to the image forming unit 115.

  In FIG. 7B, a spiral print pattern pickup antenna 359 is used as the pickup antenna 333.

  In this pickup antenna 359, the pickup antenna 257 in FIG. 5B has wiring portions 257a and 257b in a balanced circuit, whereas in the pickup antenna 359, the tip portion 361 is one of noise signal sources. The difference is that it is connected to the ground adjacent to the image forming unit 115.

  In this manner, by using the pickup antennas 355 and 359, the noise signals flowing in from the television receiving antennas 117a and 117b can be reliably canceled by the noise canceling units 137a and 137b.

  Therefore, the television reception signal received by the pickup antenna 333 is not affected. As a result, the reception sensitivity does not deteriorate even in a weak electric field region.

  Note that the spiral pickup antenna 359 may have a print pattern of one turn or less.

  As the pickup antenna 359, for example, a microstrip line may be used. This microstrip line is composed of a signal line and a ground portion provided in the vicinity of the signal line, and may be arranged in the order of the signal line and the ground portion in the vicinity of the noise signal source.

  Further, in FIG. 2, FIG. 4, and FIG. 6, even when the television receiving antenna 117b is arranged in parallel to the television receiving antenna 117a, the magnetic flux direction of the winding portions of the pickup antennas 133, 229, and 333 is the television. The receiving antennas 117a and 117b can be arranged at a right angle.

  Furthermore, the television receiving antennas 117a and 117b do not have to be parallel to each other and not to be at right angles to each other, for example, freely arranged along the plane of the substrate 143 on which the image forming unit that is a noise signal generation source is mounted. It may be the case. Even in this case, the direction of the magnetic flux in the winding portion of the pickup antennas 133, 229, and 333 can be arranged perpendicular to the television receiving antennas 117a and 117b.

  In this way, it is possible to prevent the television broadcast signal from flowing into the pickup antennas 133, 229, and 333. Therefore, it is possible to improve the reception sensitivity of the television signal in the weak electric field area.

(Embodiment 2)
Hereinafter, Embodiment 2 of the present invention will be described with reference to FIG. FIG. 8 is a block diagram of the portable device 501.

  In the mobile device 101 according to the first embodiment, noise cancellation is performed on one noise signal generation source using the pickup antenna 133 and the noise canceling units 137a and 137b.

  On the other hand, in the portable device 501 of the second embodiment, the pickup antennas 133 and 519 are provided for each of the two noise signal generation sources, and the two cancellation signal generation circuits 509 and 511 are provided in the noise cancellation unit 505. The noise canceling unit 506 is provided with two cancel signal generation circuits 515 and 517.

  In addition, about the component used in FIG. 8, the same number is attached | subjected about the same thing as FIG. 1, and description is simplified.

  In FIG. 8, the portable device 501 has a built-in high-frequency receiving unit 503 that receives a digital broadcast television signal.

  The high-frequency receiving unit 503 is provided with input terminals 511a and 511b to which television signals from the television receiving antennas 117a and 117b are respectively supplied, and an output terminal 514 to which a transport stream (PS) signal is output. .

  The noise canceling unit 505 includes a combining circuit 507 connected between the antenna matching unit 132a and the tuner demodulating unit 127a, and cancel signal generating circuits 509 and 511 connected to inputs 507a and 507b of the combining circuit 507, respectively. Is provided.

  A pickup antenna 133 is connected to the input of the cancel signal generation circuit 509 via an input terminal 520a and a wiring portion 521a. In addition, a pickup antenna 519 is connected to an input of the cancel signal generation circuit 511 via an input terminal 520b and a wiring portion 521b.

  Furthermore, a pickup antenna 133 is connected to the input of the cancel signal generation circuit 515 via an input terminal 520a and a wiring portion 521a. A pickup antenna 519 is connected to an input of the cancel signal generation circuit 517 via an input terminal 520b and a wiring portion 521b.

  The noise canceling unit 506 includes a synthesis circuit 513 connected between the antenna matching unit 132b and the tuner demodulation unit 127b, and cancel signal generation circuits 515 and 517 connected to inputs 513a and 513b of the synthesis circuit 513, respectively. Is provided.

  Pickup antennas 133 and 519 are connected to inputs of the cancel signal generation circuits 515 and 517, respectively.

  Further, the noise canceling unit 520 is configured by the noise canceling units 505 and 506, the pickup antennas 133 and 519, the pickup antennas 133 and 519, and the wiring units 521a and 521b.

  Further, the pickup antennas 133 and 519 are provided close to the image forming unit 115 and the image display unit 109, which are one of noise signal generation sources, for example.

  Thereby, the noise signal from the image forming unit 115 is extracted by the pickup antenna 133 and further input to the cancel signal generation circuits 509 and 515 via the wiring unit 521a. Similarly, a noise signal from the image display unit 109 is extracted by the pickup antenna 519 and further input to the cancel signal generation circuits 511 and 517 via the wiring unit 521b.

  In the synthesis circuit 507 to which the respective noise cancellation signals from the cancellation signal generation circuits 509 and 511 are input, the noise signals flowing in from the television receiving antennas 117a and 117b are phase canceled.

  Similarly, in the synthesis circuit 513 to which the respective noise cancellation signals from the cancellation signal generation circuits 515 and 517 are input, the noise signals flowing in from the television receiving antennas 117a and 117b are phase canceled.

  As described above, for example, even if two noise signals including a clock signal of a portable device and a harmonic signal of an oscillator intrude from two television receiving antennas, the noise signal is generated by the two pickup antennas and the two noise cancellation units. Since each can be canceled, it is possible to improve the reception sensitivity when receiving a television broadcast.

  Although the case where there are two noise signal generation sources has been described, the same applies to the case where there are M (natural numbers greater than or equal to 2) noise signal generation sources. That is, it is only necessary to provide a noise canceling unit having M pickup antennas and having the same M cancellation signal generation circuits as the M pickup antennas.

  Although the case where two television receiving antennas are used has been described, the same applies to the case where diversity reception is performed using N (natural numbers greater than or equal to 2) television receiving antennas.

  That is, the same N high frequency receiving circuits each including an antenna matching unit, a noise canceling unit, and a tuner demodulating unit are provided corresponding to N television receiving antennas. P pickup antennas corresponding to P (natural numbers greater than or equal to 2) noise signal generation sources are respectively provided in the N noise cancellation units.

  Thereby, the noise signal can be canceled by the noise canceling unit.

  As described above, the present invention can be used for a mobile phone capable of receiving a television signal, a portable game machine, a portable computer, a portable dictionary, and the like.

1 is a block diagram of a mobile device according to a first embodiment of the present invention. Same as above, mobile device layout (A) The figure of other embodiment of the pick-up antenna in a portable device, (b) The figure of other embodiment of the pick-up antenna in a portable device Arrangement of other embodiment of portable device (A) The figure of other embodiment of the pick-up antenna in a portable device, (b) The figure of other embodiment of the pick-up antenna in a portable device Arrangement of other embodiment of portable device (A) The figure of other embodiment of the pick-up antenna in a portable device, (b) The figure of other embodiment of the pick-up antenna in a portable device Block diagram of portable device of embodiment 2

Explanation of symbols

117a Television receiving antenna 117b Television receiving antenna 133 Pickup antenna 137a Noise canceling unit 137b Noise canceling unit

Claims (12)

A pickup antenna that is arranged in the vicinity of the noise generation source and extracts a noise signal output from the noise generation source, and a television signal from a first television reception antenna is supplied to a first input and A first noise canceling unit for supplying the noise signal extracted by the pickup antenna to the second input; and a television signal from the second television receiving antenna is supplied to the third input and the pickup antenna. A second noise canceling unit for supplying the noise signal extracted by the first and second television receiving antennas to the first and second antennas, respectively. Noise canceling device that cancels by the noise canceling unit. The first noise cancellation unit adjusts the phase and gain of the noise signal supplied from the second input, and the first cancellation signal generation circuit outputs the first cancellation signal generation circuit. The first noise cancellation signal and the television signal supplied from the first input are respectively configured by a first synthesis circuit, and the second noise cancellation unit is supplied from the fourth input. A second cancel signal generating circuit for adjusting a phase and a gain of the noise signal; a second noise cancel signal output from the second cancel signal generating circuit; and the television signal supplied from the third input. The noise canceling device according to claim 1, wherein each of the noise canceling devices is configured by a second synthesis circuit. 2. The noise canceling device according to claim 1, wherein a winding axis direction of the pickup antenna is arranged at a right angle with respect to the first television receiving antenna and the second television receiving antenna. The noise canceling apparatus according to claim 3, wherein a spiral print pattern is used for the pickup antenna. The noise cancellation device according to claim 3, wherein a chip inductor is used for the pickup antenna. 2. The noise canceling device according to claim 1, wherein one terminal of the pickup antenna is connected to an input of the noise canceling unit, and the other terminal is connected to a ground unit adjacent to the noise signal generation source. 2. The noise cancellation device according to claim 1, wherein one terminal and the other terminal of the pickup antenna are respectively connected to inputs of the first and second cancellation signal generation circuits by a wiring portion of a balanced circuit. The noise cancellation apparatus according to claim 1, wherein a high frequency amplifier is provided between the pickup antenna and the first and second noise cancellation units and in proximity to an output of the pickup antenna. 2. A noise canceling device comprising a plurality of noise canceling units according to claim 1, wherein the noise canceling unit is provided with a synthesis circuit and a cancel signal generating circuit, and the cancel signal generating circuit has one pickup antenna. Noise cancellation device to which the noise signal from each is input. A noise canceling device provided with a plurality of noise canceling units according to claim 1, wherein the noise canceling unit is provided with a synthesis circuit and a plurality of canceling signal generating circuits, and input to the canceling signal generating circuit A noise canceling device to which any one of a plurality of pickup antennas is input. 2. The noise canceling device according to claim 1, a tuner unit that receives a signal from the noise canceling device and selects a received signal, and a demodulator that receives a signal from the tuner unit and outputs a demodulated signal A high frequency receiving unit. A portable device provided with the high-frequency receiving unit according to claim 11, an image forming unit to which a signal from the high-frequency receiving unit is input, and an image display unit for displaying an image by a signal from the image forming unit.

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