JP2005045537A - Portable telephone set with television signal receiving function and method for preventing interference to portable telephone set with television signal receiving function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable telephone with a built-in television (TV) signal receiving function by which adverse effects of a TV tuner can be reduced to portable telephone signals. <P>SOLUTION: A TV tuner synthesizer frequency setting change deciding part 51c decides whether a portable telephone signal receives interferences of a prescribed level or more from a TV tuner part 12 on the basis of a result of receiving line quality decision which is performed by a receiving line quality decision part 51a and a result of the receiving level decision which is performed by a receiving level decision part 51b. At the time of deciding that the portable telephone signal receives interferences of the prescribed level or more from the TV tuner part 12, the frequency of a 1st tuning signal outputted from a TV tuner synthesizer part 12b and the frequency of a 2nd tuning signal outputted from a TV tuner synthesizing part 12c are changed in a range where a channel tuned by the TV tuning part 12 is maintained. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mobile phone with a TV signal reception function and an interference prevention method for a mobile phone with a TV signal reception function.

  Currently, each mobile phone maker is trying to win a sales competition by introducing a mobile phone having not only a telephone function but also a function different from the telephone function to the market.

  As a mobile phone having a function different from the telephone function, for example, a mobile phone equipped with a digital camera, a mobile phone capable of using a card-type recording medium capable of storing various data, and with an FM radio reception function There are a mobile phone, a mobile phone with a video phone function (see Patent Document 1 (Japanese Patent Laid-Open No. 2001-333163) and Patent Document 2 (Japanese Patent Laid-Open No. 6-334998)), and a mobile phone with a TV signal receiving function.

  In particular, since a mobile phone with a TV signal receiving function can receive a TV signal transmitted from a TV broadcasting station by a mobile phone, the mobile phone can be used as a small TV receiver.

  However, since both the mobile phone and the television receiver receive radio waves and process the received radio waves, there is a high possibility that the received radio waves have an adverse effect.

  Patent Document 3 (Japanese Patent Laid-Open No. 2003-168992) describes a technique for preventing a signal for a mobile phone (hereinafter referred to as a “mobile phone signal”) from adversely affecting a television signal receiving apparatus. Yes.

Specifically, in a television signal receiving apparatus, a technique is described in which a trap circuit for blocking a frequency used in a mobile phone is inserted between an antenna and a low-pass filter.
JP 2001-333163 A JP-A-6-334998 JP 2003-168992 A

  Patent Document 3 describes a television signal receiving apparatus that is not affected by the signal of a mobile phone, but does not describe a technique for reducing the influence of the television signal in the mobile phone.

  An object of the present invention is to provide a mobile phone with a TV signal reception function and a method for preventing interference of the mobile phone with a TV signal reception function, which can reduce adverse effects on the mobile phone signal due to having a TV tuner section. That is.

  In order to achieve the above object, a mobile phone with a television signal reception function according to the present invention uses a tuning signal generated to tune a desired channel selected by a user, and uses a desired channel of a television signal. A TV tuner unit that tunes the mobile phone signal, a mobile phone signal receiving unit that receives a mobile phone signal, and a mobile phone signal received by the mobile phone signal receiving unit; It is determined whether or not there is interference, and when it is determined that the mobile phone signal is receiving interference of the predetermined level or more from the TV tuner unit, the frequency of the tuning signal of the TV tuner unit is changed. A frequency changing unit, wherein the television tuner unit is a tuner whose frequency has been changed by the frequency changing unit. Using ring signal, and wherein the tuning the desired channel of the television signal.

  According to the above invention, when the mobile phone signal receives interference of a predetermined level or more from the TV tuner unit, the frequency of the tuning signal of the TV tuner unit is changed, so that the signal generated based on the tuning signal is It is possible to prevent the mobile phone signal from being adversely affected.

  In addition, the mobile phone with a TV signal receiving function of the present invention further includes a storage unit, and the frequency changing unit causes interference with the mobile phone signal of the TV tuner unit by changing the frequency of the tuning signal. When the frequency becomes lower than the predetermined level, the frequency of the tuning signal after the change, a desired channel of the television signal, and a mobile phone signal channel indicating the frequency of the mobile phone signal are associated with each other in the storage unit. When the mobile phone signal receiving unit stores the mobile phone signal, the channel of the TV signal tuned by the TV tuner unit and the frequency of the mobile phone signal received by the mobile phone signal receiving unit are indicated. When the frequency of the tuning signal associated with the mobile phone signal channel is stored in the storage unit The frequency of the tuning signal of the TV tuner unit is related to the channel of the TV signal being tuned by the TV tuner unit and the mobile phone signal channel indicating the frequency of the mobile phone signal received by the mobile phone signal receiving unit. The frequency of the tuning signal stored in the storage unit is changed.

  According to the above invention, since the frequency of the tuning signal that does not adversely affect the mobile phone signal is stored in the storage unit, the mobile phone signal is adversely affected by reusing the frequency stored in the storage unit. It is possible to prevent the frequency of the tuning signal that is not given from being obtained a plurality of times.

  In the mobile phone with a TV signal receiving function of the present invention, the TV tuner unit receives a TV signal, a TV signal receiving unit that outputs a first tuning signal, and a tuning signal output unit that outputs a first tuning signal. The first intermediate frequency signal is generated by mixing the television signal received by the television signal receiving unit and the first tuning signal output by the first tuning signal output unit, and generating the first intermediate frequency signal. A first mixer for outputting an intermediate frequency signal, a first filter for extracting a signal of a desired frequency including the first intermediate frequency signal from the output signal of the first mixer, and a second tuning signal The second tuning signal output unit that outputs the signal, the signal of the desired frequency extracted by the first filter, and the second tuning signal output unit output The second tuning signal is mixed to generate a second intermediate frequency signal, the second mixer outputting the generated second intermediate frequency signal, and the second mixer output signal from the second mixer A second filter that extracts the intermediate frequency signal of the mobile phone signal, wherein the frequency changing unit receives a mobile phone signal received by the mobile phone signal receiving unit from the TV tuner unit at a predetermined level or more. The frequency of the first tuning signal output from the first tuning signal output unit and the frequency of the second tuning signal output from the second tuning signal output unit are changed. To do.

  According to the above invention, even if a double superheterodyne system is used as the TV tuner unit, the same effect as described above can be obtained.

  Further, in the mobile phone with a TV signal receiving function of the present invention, the frequency changing unit is configured such that the line quality of the mobile phone signal received by the mobile phone signal receiving unit is lower than a predetermined level, and the mobile phone signal receiving unit When the reception level of the mobile phone signal received by is higher than a predetermined reception level, it is determined that the mobile phone signal has received interference of a predetermined level or more from the TV tuner unit.

  According to the above invention, it is possible to easily determine whether or not the cellular phone signal receives interference of a predetermined level or more from the TV tuner unit.

  The mobile phone with a TV signal receiving function of the present invention selects a TV tuner unit for tuning a desired channel of a TV signal, a plurality of antennas for receiving a mobile phone signal, and one antenna from the plurality of antennas. Based on the antenna selection unit and the mobile phone signal received via the antenna selected by the antenna selection unit, it is determined whether or not the mobile phone signal has received interference of a predetermined level or more from the TV tuner unit, An antenna switching unit that switches the antenna selected by the antenna selection unit to an antenna different from the antenna when it is determined that the cellular phone signal receives interference of a predetermined level or more from the TV tuner unit; It is characterized by.

  According to the above invention, when the cellular phone signal receives interference from the TV tuner unit, the antenna selected by the antenna selection unit is switched to an antenna different from the antenna among the plurality of antennas. Among a plurality of antennas that receive telephone signals, an antenna that is less influenced by the TV tuner unit or that is not affected by the TV tuner unit can be used as an antenna for receiving a cellular phone signal.

  The mobile phone with a TV signal reception function of the present invention further includes a storage unit, and the antenna switching unit interferes with the mobile phone signal of the TV tuner unit by switching the antenna selected by the antenna selection unit. Is lower than the predetermined level, the antenna information indicating the antenna after switching, the desired channel of the television signal, and the mobile phone signal channel indicating the frequency of the mobile phone signal are associated with each other and stored. When the mobile phone signal receiving unit receives the mobile phone signal, the TV signal channel tuned by the TV tuner unit and the frequency of the mobile phone signal received by the mobile phone signal receiving unit are stored. Antenna information associated with a mobile phone signal channel indicating is stored in the storage unit In this case, the antenna selected by the antenna selection unit is associated with the channel of the TV signal tuned by the TV tuner unit and the cell phone signal channel indicating the frequency of the cell phone signal received by the cell phone signal receiving unit. And switching to the antenna indicated by the antenna information stored in the storage unit.

  According to the above invention, since the antenna information indicating the antenna that does not adversely affect the mobile phone signal is stored in the storage unit, the antenna information stored in the storage unit is reused to adversely affect the mobile phone signal. It is possible to prevent detection of an antenna that does not give a plurality of times.

  In the mobile phone with a TV signal receiving function of the present invention, the antenna switching unit has a line quality of a mobile phone signal received by the mobile phone signal receiving unit lower than a predetermined level, and the mobile phone signal receiving unit When the reception level of the mobile phone signal received by is higher than a predetermined reception level, it is determined that the mobile phone signal has received interference of a predetermined level or more from the TV tuner unit.

  The method for preventing interference of a mobile phone with a TV signal receiving function according to the present invention tunes a desired channel of a TV signal using a tuning signal generated to tune a desired channel selected by a user. An interference prevention method performed by a mobile phone with a TV signal receiving function, including a TV tuner unit that performs a mobile phone signal reception unit that receives a mobile phone signal, based on the mobile phone signal received by the mobile phone signal receiver unit An interference determination step for determining whether or not the mobile phone signal receives interference of a predetermined level or more from the television tuner unit; and the interference determination step, wherein the mobile phone signal is greater than or equal to the predetermined level from the television tuner unit. The first frequency for changing the frequency of the tuning signal when it is determined that the interference is received. The number changing step, by using the tuning signal frequency is changed by the first frequency changing step, characterized in that it comprises a tuning step of tuning the desired channel of the television signal.

  According to the above invention, when the mobile phone signal receives interference of a predetermined level or more from the TV tuner unit, the frequency of the tuning signal of the TV tuner unit is changed, so that the signal generated based on the tuning signal is It is possible to prevent the mobile phone signal from being adversely affected.

  In the method for preventing interference of a mobile phone with a TV signal receiving function according to the present invention, the change of the frequency of the tuning signal in the first frequency changing step causes interference of the TV tuner unit with the mobile phone signal. When the frequency becomes lower than the predetermined level, the frequency of the tuning signal after the change, the desired channel of the television signal, and the mobile phone signal channel indicating the frequency of the mobile phone signal are stored in the storage unit in association with each other. A storage step, a channel of a TV signal tuned by the TV tuner unit when the mobile phone signal receiving unit receives the mobile phone signal, and a frequency of the mobile phone signal received by the mobile phone signal receiving unit The frequency of the tuning signal associated with the mobile phone signal channel indicating is stored in the storage unit Mobile phone indicating the frequency of the tuning signal of the TV tuner unit, the channel of the TV signal being tuned by the TV tuner unit, and the frequency of the mobile phone signal received by the mobile phone signal receiving unit. And a second frequency changing step for changing to the frequency of the tuning signal stored in the storage unit in association with the signal channel.

  According to the above invention, since the frequency of the tuning signal that does not adversely affect the mobile phone signal is stored in the storage unit, the mobile phone signal is adversely affected by reusing the frequency stored in the storage unit. It is possible to prevent the frequency of the tuning signal that is not given from being obtained a plurality of times.

  Also, in the interference prevention method for a mobile phone with a TV signal receiving function according to the present invention, the TV tuner unit receives a TV signal, and the first tuning signal outputs a first tuning signal. A first intermediate frequency signal is generated by mixing the output unit, the television signal received by the television signal receiving unit, and the first tuning signal output by the first tuning signal output unit A first mixer for outputting the first intermediate frequency signal, a first filter for extracting a signal of a desired frequency including the first intermediate frequency signal from the output signal of the first mixer, and a second filter A second tuning signal output unit that outputs a tuning signal of the desired frequency, a signal of a desired frequency extracted by the first filter, and the second tuning signal. A second mixer for generating a second intermediate frequency signal by mixing the second tuning signal output from the output unit, and outputting the generated second intermediate frequency signal; and an output of the second mixer And a second filter for extracting the second intermediate frequency signal from the signal, wherein the first frequency changing step is configured such that the mobile phone signal received by the mobile phone signal receiving unit receives a predetermined level from the TV tuner unit. When receiving the above interference, the frequency of the first tuning signal output from the first tuning signal output unit and the frequency of the second tuning signal output from the second tuning signal output unit It is characterized by changing.

  Further, in the interference prevention method for a mobile phone with a TV signal receiving function according to the present invention, the interference determination step includes: the mobile phone signal received by the mobile phone signal receiving unit has a line quality lower than a predetermined level; When the reception level of the mobile phone signal received by the telephone signal receiving unit is higher than a predetermined reception level, it is determined that the mobile phone signal has received interference of a predetermined level or more from the TV tuner unit. .

  Also, the interference prevention method for a mobile phone with a TV signal receiving function according to the present invention includes a TV tuner unit that tunes a desired channel of a TV signal, and a mobile phone with a TV signal receiving function that includes a plurality of antennas that receive mobile phone signals. An interference prevention method performed by a telephone, the antenna selecting step for selecting one antenna from the plurality of antennas, and the mobile phone signal based on the mobile phone signal received through the antenna selected in the antenna selection step In the interference determination step for determining whether or not the TV tuner unit receives interference of a predetermined level or higher, and in the interference determination step, the mobile phone signal receives interference of a predetermined level or higher from the TV tuner unit. If it is determined, the antenna selected in the antenna selection unit step is Characterized by comprising comprises a first antenna switching step of switching the antenna.

  Also, the interference prevention method for a mobile phone with a TV signal receiving function according to the present invention is such that the interference of the TV tuner unit with the mobile phone signal is lower than the predetermined level due to the antenna switching in the antenna switching step. Storing the antenna information indicating the antenna after switching, the desired channel of the television signal, and the mobile phone signal channel indicating the frequency of the mobile phone signal in the storage unit in association with each other, and the mobile phone signal When the receiving unit receives the mobile phone signal, it associates the channel of the TV signal tuned by the TV tuner unit with the mobile phone signal channel indicating the frequency of the mobile phone signal received by the mobile phone signal receiving unit. If the stored antenna information is stored in the storage unit, The antenna selected in the data selection step is stored in association with the channel of the TV signal tuned by the TV tuner unit and the mobile phone signal channel indicating the frequency of the mobile phone signal received by the mobile phone signal receiver. And a second antenna switching step for switching to the antenna indicated by the antenna information stored in the unit.

  Further, in the interference prevention method for a mobile phone with a TV signal receiving function according to the present invention, the interference determination step includes: the mobile phone signal received by the mobile phone signal receiving unit has a line quality lower than a predetermined level; When the reception level of the mobile phone signal received by the telephone signal receiving unit is higher than a predetermined reception level, it is determined that the mobile phone signal has received interference of a predetermined level or more from the TV tuner unit. .

  According to the present invention, when the mobile phone signal receives interference of a predetermined level or more from the TV tuner unit, the frequency of the tuning signal of the TV tuner unit is changed, so that the signal generated based on the tuning signal is It is possible to prevent the mobile phone signal from being adversely affected.

  Further, since the frequency of the tuning signal that does not adversely affect the cellular phone signal is stored in the storage unit, the tuning signal that does not adversely affect the cellular phone signal by reusing the frequency stored in the storage unit It is possible to prevent the determination of the frequency of multiple times.

  Further, even if a double superheterodyne system is used as the television tuner unit, the same effect as described above can be obtained.

  In addition, when the cellular phone signal receives interference from the TV tuner unit, the antenna selected by the antenna selection unit is switched to an antenna different from the antenna among the plurality of antennas, so that the cellular phone signal is received. Among a plurality of antennas, an antenna that is less influenced by the TV tuner unit or that is not affected by the TV tuner unit can be used as an antenna for receiving a mobile phone signal.

  Since the antenna information indicating the antenna that does not adversely affect the mobile phone signal is stored in the storage unit, an antenna that does not adversely affect the mobile phone signal can be reused by reusing the antenna information stored in the storage unit. It is possible to prevent detection multiple times.

  An embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a mobile phone with a TV signal receiving function according to an embodiment of the present invention.

  1, a mobile phone with a TV signal receiving function according to an embodiment of the present invention includes an antenna 1, an antenna 2, a signal distribution unit 3, a mobile phone signal transmission / reception block 4, an MCPU 5, a driver unit 6, Speaker 7, display unit 8, power source 9, user IF unit 10, key 11, TV tuner unit 12, decoder unit 13, TV tuner frequency setting memory unit 14, and TV tuner power on / off unit 15 and the like.

  The cellular phone signal transmission / reception block 4 includes an antenna path switching unit 41, a reception radio unit 42, a cellular phone synthesizer unit 43, a transmission radio unit 44, and a baseband unit 45.

  The MCPU 5 includes a frequency changing unit 51, a TV tuner power on / off determining unit 52, and a mobile phone synthesizer frequency setting unit 53.

  The frequency change unit 51 includes a reception line quality determination unit 51a, a reception level determination unit 51b, a television tuner synthesizer frequency setting change determination unit 51c, a television tuner synthesizer frequency calculation unit 51d, and a television tuner synthesizer frequency setting unit 51e. Including.

  The TV tuner unit 12 includes a reception radio unit 12a, a TV tuner synthesizer unit 12b, a TV tuner synthesizer unit 12c, and a video IF unit sound IF unit 12d.

  The antenna 1 transmits and receives mobile phone signals and receives television signals. The antenna 2 receives a mobile phone signal. Note that the television signal received by the antenna 1 is a television signal transmitted from a television broadcasting station. In addition, the mobile phone signal received by the antenna 1 and the antenna 2 is, for example, a mobile phone signal having a frequency defined by a reception channel specified by the radio base station. Hereinafter, “channel” is referred to as “CH”.

  The signal distribution unit 3 supplies the mobile phone signal received by the antenna 1 to the mobile phone signal transmission / reception block 4 and supplies the TV signal received by the antenna 1 to the TV tuner unit 12.

  When a mobile phone signal transmission / reception block 4 serving as a mobile phone signal receiving unit receives a mobile phone signal via the antenna 1 or the antenna 2, the mobile phone signal transmission / reception block 4 is defined by the received mobile phone signal which is a high-frequency radio signal, specifically, a reception CH A mobile phone signal having a frequency (hereinafter referred to as “reception CH frequency”) is frequency-converted to generate a baseband signal, and the generated baseband signal is sent to the MCPU 5.

  In addition, when transmitting a mobile phone signal, the mobile phone signal transmission / reception block 4 receives a signal (baseband signal) to be transmitted from the MCPU 5 and converts the frequency of this baseband signal to a mobile phone signal of a high-frequency radio signal, specifically, Generates a mobile phone signal having a transmission CH frequency, and transmits the generated mobile phone signal from the antenna 1.

  The antenna path switching unit 41 switches the signal path route to the reception radio unit 42 by selecting the antenna 1 or the antenna 2 as an antenna connected to the reception radio unit 42. Further, the antenna path switching unit 41 switches the signal path route from the transmission radio unit 44 by selecting the antenna 1 or the antenna 2 as an antenna connected to the transmission radio unit 44.

  The reception radio unit 42 mixes mobile phone signals of various reception CH frequencies supplied via the antenna path switching unit 41 and signals of local oscillation frequencies supplied from the mobile phone synthesizer unit 43. The mobile phone signal of various reception CH frequencies is frequency-converted into a constant IF (intermediate frequency) signal.

  The mobile phone synthesizer unit 43 is controlled by the mobile phone synthesizer frequency setting unit 53 in the MCPU 5 so that the reception radio unit 42 converts mobile phone signals of various reception CH frequencies into IF signals having a constant frequency. A signal with the local oscillation frequency changed as appropriate is output.

  The baseband unit 45 demodulates and converts the IF signal received from the reception radio unit 42 into a baseband signal, and sends the converted baseband signal to the MCPU 5, specifically, the reception line quality determination unit 51a. Further, the baseband unit 45 supplies the IF signal received from the reception radio unit 42 to the MCPU 5, specifically, the reception level determination unit 51b.

  The baseband unit 45 receives digital data to be transmitted from the MCPU 5, and sends a baseband signal corresponding to the digital data to the transmission radio unit 44.

  The transmission radio unit 44 converts the input baseband signal into a signal of the transmission CH frequency using the signal output from the mobile phone synthesizer unit 43, and sends the converted signal to the antenna path switching unit 41.

  The mobile phone synthesizer unit 43 changes the frequency of the output signal so that the baseband signal becomes a signal of the transmission CH frequency in the transmission radio unit 44 under the control of the mobile phone synthesizer frequency setting unit 53 in the MCPU 5.

  A signal of the transmission CH frequency supplied to the antenna path switching unit 41 is transmitted from the antenna 1 via the signal distribution unit 3.

  A television signal received by the antenna 1 is supplied to the television tuner unit 12 via the signal distribution unit 3. The television tuner unit 12 tunes a desired channel of a television signal using a tuning signal generated to tune a desired channel selected by the user. The desired channel of the television signal is selected by operating the key 11 by the user.

  The reception radio unit 12a is configured by a double superheterodyne system, a first local frequency signal output from the TV tuner synthesizer unit 12b (hereinafter referred to as “first tuning signal”), and the signal distribution unit 3. The first intermediate frequency signal is generated by mixing with the television signal supplied via the.

  Further, the reception radio unit 12a mixes the first intermediate frequency signal and the second local frequency signal (hereinafter referred to as “second tuning signal”) output from the television tuner synthesizer unit 12c. And generating a second intermediate frequency signal.

  The reception radio unit 12a sends the second intermediate frequency signal to the video IF unit sound IF unit 12d.

  Since the frequency of the second intermediate frequency signal is fixed, the TV tuner is set according to the reception TV channel designated by the operation of the key 11 so that the received TV signal can be converted into the second intermediate frequency signal. The first local frequency included in the first tuning signal output from the synthesizer unit 12b and the second local frequency included in the second tuning signal output from the television tuner synthesizer unit 12c are changed.

  Specifically, in the TV tuner synthesizer unit 12b, the first local frequency is controlled by the frequency changing unit 51 in the MCPU 5, specifically, the TV tuner synthesizer frequency setting unit 51e. In the TV tuner synthesizer unit 12c, the second local frequency is controlled by the frequency changing unit 51 in the MCPU 5, more specifically, by the TV tuner synthesizer frequency setting unit 51e.

  The video IF unit sound IF unit 12d demodulates the second intermediate frequency signal supplied from the reception radio unit 12a to generate a video signal and an audio signal, and the generated video signal and audio signal to the decoder unit 13 is supplied.

  The decoder unit 13 converts each of the video signal and the audio signal supplied from the video IF unit sound IF unit 12 d into digital data, and supplies the video signal and the audio signal converted into the digital data to the MCPU 5.

  The MCPU 5 controls the overall operation of the mobile phone with a TV signal reception function.

  For example, the MCPU 5 causes the display unit 8 to perform display according to the video signal converted into digital data, and supplies the driver unit 6 with sound according to the audio signal converted into digital data. The driver unit 6 causes the speaker 7 to output a sound corresponding to the supplied audio signal.

  In addition, the MCPU 5 controls the driver unit 6 to cause the speaker 7 to perform notification at the time of incoming call or to transmit voice to the user during a call. In addition, the MPU 5 outputs a sound corresponding to the television signal from the speaker 7 when viewing the television.

  In addition, when the mobile phone with a TV signal reception function has an e-mail function, the MCPU 5 displays the mail content when the e-mail is received on the display unit 8 or displays according to the display function of the mobile phone. Is realized on the display unit 8, or a TV image is displayed on the display unit 8 when watching TV.

  Further, the MCPU 5 controls a predetermined operation as a mobile phone and a predetermined operation as a television receiver in accordance with an operation by the user of the key 11 input via the user IF unit 29.

  The MCPU 5 operates the TV tuner power on / off determination unit 52 according to the operation of the key 11 via the user IF unit 29 by the user, and causes the TV tuner power on / off unit 15 to supply power to the TV tuner unit 12. Tell the necessity of supply.

  The TV tuner power on / off determination unit 52 supplies power to the TV tuner unit 12 by the TV tuner power on / off 15 when the TV 11 is turned on by an operation by the user of the key 11, and the user of the key 11 When the television is turned off by the operation, the television tuner power on / off 15 stops the power supply to the television tuner unit 12.

  The power source 9 is a portable power source such as a battery pack and serves as a power source for a mobile phone with a TV signal receiving function.

  The frequency changing unit 51 in the MCPU 5 receives an interference of a predetermined level or more from the TV tuner unit 12 based on the mobile phone signal received by the mobile phone signal transmission / reception block 4 via the antenna 1 or the antenna 2. If it is determined whether the mobile phone signal is receiving interference of a predetermined level or more from the TV tuner unit 12, the TV tuner unit is within a range that maintains the channel being tuned by the TV tuning unit 12. The frequency of the 12 tuning signals is changed.

  The frequency changing unit 51 has a line quality of the cellular phone signal received by the cellular phone signal transmission / reception block 4 lower than a predetermined level, and a reception level of the cellular phone signal received by the cellular phone signal transmission / reception block 4 is predetermined reception. When the level is higher than the level, it is determined that the mobile phone signal received by the mobile phone signal transmission / reception block 4 has received interference of a predetermined level or more from the TV tuner unit 12.

  The reception line quality determination unit 51a determines whether or not the line quality of the mobile phone signal received by the mobile phone signal transmission / reception block 4 is lower than a predetermined level. In the present embodiment, the reception line quality determination unit 51 a receives the mobile phone signal received by the mobile phone signal transmission / reception block 4 via the antenna 1 or the antenna 2 based on the phase information of the baseband signal supplied from the baseband unit 45. Determine the quality of the received line.

  Specifically, the reception line quality determination unit 51a receives the mobile phone signal received by the mobile phone signal transmission / reception block 4 via the antenna 1 or the antenna 2 based on the phase information of the baseband signal supplied from the baseband unit 45. And the received line quality of the received cellular phone signal is determined based on the estimated bit error rate.

  In the present embodiment, the reception line quality determination unit 51a determines that the reception error is “bad reception quality” (hereinafter referred to as “bad”) when the bit error rate is a certain value M or more, and the bit error rate is a certain value M. If the bit error rate is smaller and the bit error rate is equal to or higher than a predetermined value N, “reception line quality is medium” (hereinafter referred to as “medium”). (Hereinafter referred to as “good”).

  The reception level determination unit 51b detects the reception level of the mobile phone signal received by the mobile phone signal transmission / reception block 4 via the antenna 1 or the antenna 2 based on the signal output from the baseband unit 45, and the detected reception level. Make a decision. In the present embodiment, the reception level determination unit 51b determines whether or not the reception level of the mobile phone signal received by the mobile phone signal transmission / reception block 4 via the antenna 1 or the antenna 2 is equal to or higher than a predetermined reception level.

  The TV tuner synthesizer frequency setting change determination unit 51c determines the reception channel quality determination performed by the reception channel quality determination unit 51a, the reception level determination performed by the reception level determination unit 51b, and the TV tuner power on / off determination. Based on the on / off determination of the TV tuner unit 12 performed by the unit 52, the first local frequency of the first tuning signal output from the TV tuner synthesizer unit 12b and the second local frequency output from the TV tuner synthesizer unit 12c. It is determined whether or not there is a need to change the tuning signal with the second local frequency.

  Specifically, the television tuner synthesizer frequency setting change determination unit 51c determines that the result of the reception line quality determination performed by the reception line quality determination unit 51a is “bad” and the reception level determination performed by the reception level determination unit 51b. If the result is equal to or higher than the predetermined reception level, the mobile phone signal transmission / reception block 4 determines that the mobile phone signal received by the mobile phone signal transmission / reception block 4 has received interference of a predetermined level or higher from the TV tuner unit 12, and If it is determined that the received cellular phone signal has received a predetermined level or more of interference from the TV tuner unit 12, it is determined that each local frequency needs to be changed.

  The TV tuner synthesizer frequency calculation 51d is based on the determination result of the TV tuner synthesizer frequency setting change determination unit 51c, the first local frequency of the first tuning signal output by the TV tuner synthesizer unit 12b, and the TV tuner synthesizer unit 12c. And the second local frequency of the second tuning signal output from the.

  The TV tuner synthesizer frequency setting unit 51e outputs the first local frequency calculated by the TV tuner synthesizer frequency calculation 51d to the TV tuner synthesizer unit 12b, and the first local frequency calculated by the TV tuner synthesizer frequency calculation 51d is output. The tuning signal is output from the TV tuner synthesizer unit 12b.

  The TV tuner synthesizer frequency setting unit 51e outputs the second local frequency calculated by the TV tuner synthesizer frequency calculation 51d to the TV tuner synthesizer unit 12c, and the second local frequency calculated by the TV tuner synthesizer frequency calculation 51d. The second tuning signal is output from the TV tuner synthesizer unit 12c.

  In addition, when the frequency of the tuning signal is changed, the frequency changing unit 51 changes the frequency of the tuning signal after the change when the interference to the mobile phone signal by the TV tuner unit 12 is lower than a predetermined level. Are stored in the TV tuner frequency setting memory unit 14 in association with a desired channel of the TV signal and a mobile phone signal channel indicating the frequency of the mobile phone signal at that time.

  Further, the frequency changing unit 51 receives the mobile phone signal received by the mobile phone signal transmitting / receiving unit 4 and the channel of the TV signal tuned by the TV tuner unit 12 when the mobile phone signal transmitting / receiving unit 4 receives the mobile phone signal. When the frequency of the tuning signal associated with the mobile phone signal channel indicating the frequency of the TV tuner is stored in the TV tuner frequency setting memory unit 14, the frequency of the tuning signal of the TV tuner unit 12 is set as the TV tuner unit. 12 is a tuning signal stored in the TV tuner frequency setting memory 14 in association with the channel of the TV signal being tuned by 12 and the mobile phone signal channel indicating the frequency of the mobile phone signal received by the mobile phone signal transmitting / receiving unit 4. Change the frequency to.

  FIG. 2 is a block diagram illustrating an example of the reception radio unit 12a in the TV tuner unit 12, the TV tuner synthesizer unit 12b, and the TV tuner synthesizer unit 12c. In FIG. 2, the same components as those in FIG. 1 are denoted by the same reference numerals.

  In FIG. 2, the reception radio unit 12a of the double superheterodyne system includes an amplifier 12a1, an AGC (automatic gain control) amplifier 12a2, a first mixer 12a3, a SAW (Surface Acoustic Wave) filter 12a4, and a second mixer. 12a5 and SAW filter 12a6.

  The amplifier 12a1 receives the television signal received by the antenna 1 and supplied via the signal distribution unit 3, and amplifies the received television signal. The AGC amplifier 12a2 amplifies the output of the amplifier 12a1. That is, the AGC amplifier 12a2 outputs a television signal.

  The first mixer 12a3 mixes the output (television signal) of the AGC amplifier 12a2 and the first tuning signal output from the television tuner synthesizer unit 12b to generate a first intermediate frequency signal.

  The SAW filter 12a4 extracts a signal having a desired frequency from the first intermediate frequency signal output from the first mixer 12a3, specifically, a television first frequency signal. The frequency of the signal extracted by the SAW filter 12a4 is a frequency obtained by subtracting the frequency of the television signal from the frequency of the first tuning signal (first local frequency).

  The second mixer 12a5 generates a second intermediate frequency signal by mixing the television first frequency signal extracted by the SAW filter 12a4 and the second tuning signal output from the television tuner synthesizer unit 12c. .

  The SAW filter 12a6 extracts a signal having a predetermined frequency, specifically, a television second frequency signal from the second intermediate frequency signal output from the second mixer 12a5. The frequency of the signal extracted by the SAW filter 12a6 is a frequency obtained by subtracting the frequency of the first television frequency signal from the frequency of the second tuning signal (second local frequency).

  Next, the relationship between the signal generated when the TV tuner unit 12 operates and the mobile phone signal will be described.

  For example, a specific channel of television broadcasting is designated by the key 11, and in order to tune (tune) this specific channel, the TV tuner synthesizer unit 12b uses a first tuning signal having a first local frequency of 1322 MHz. When the TV tuner synthesizer unit 12c outputs a second tuning signal having a second local frequency of 1160 MHz, the active elements in the TV tuner unit 12 (the amplifier 12a1, the AGC amplifier 12a2, the first In the first mixer 12a3 and the second mixer 12a5), a signal having a frequency of 1322 MHz × 2-1160 MHz = 1484 MHz is generated.

  The signal of this frequency may reach the reception radio unit 42 in the mobile phone signal transmission / reception block 4 via the antenna 1 or the power supply line, for example.

  In such a situation, for example, if the reception frequency bands of the mobile phone signal are 810 to 885 MHz and 1477 MHz to 1501 MHz, the signal generated by the active element in the TV tuner unit 12 falls within the reception frequency range of the mobile phone. Therefore, there is a possibility that it becomes an interference wave for the mobile phone.

  Specifically, when the reception CH frequency of the mobile phone signal is 1484 MHz, a signal having a frequency of 1484 MHz generated by an active element in the TV tuner unit 12 becomes an interference wave of the mobile phone signal, and the mobile phone signal The reception sensitivity deteriorates, and problems such as inability to make a call or e-mail communication occur.

  The first or second tuning signal is also used when the frequency (local frequency) of the first or second tuning signal used in the TV tuner unit 12 and the reception CH frequency of the mobile phone signal are the same. Becomes a disturbing wave of the cellular phone signal, and the reception sensitivity of the cellular phone signal is deteriorated, which causes problems such as inability to make a call or mail communication.

  In addition, when the frequency (local frequency) of the first or second tuning signal used in the TV tuner unit 12 is 1620 MHz, a signal having a frequency of 1640 MHz / 2 = 820 MHz is generated in the active element in the TV tuner unit 12. Arise. In this case, when the reception CH frequency of the mobile phone signal is 820 MHz, the signal of the frequency of 820 MHz generated by the active element in the TV tuner unit 12 becomes an interference wave of the mobile phone signal, and the reception sensitivity of the mobile phone signal deteriorates. Problems such as inability to make a call or inability to communicate via email occur.

  Also, the TV tuner synthesizer unit 12b outputs a first tuning signal having a first local frequency of 1390 MHz, and the TV tuner synthesizer unit 12c outputs a second tuning signal having a second local frequency of 1160 MHz. In this case, a signal having a frequency of (1390 MHz × 2-1160 MHz) / 2 = 810 MHz is generated in the active element in the TV tuner unit 12.

  In this case, when the reception CH frequency of the mobile phone signal is 810 MHz, the signal of the frequency of 810 MHz generated by the active element in the TV tuner unit 12 becomes an interference wave of the mobile phone signal, and the reception sensitivity of the mobile phone signal is deteriorated. Problems such as inability to make a call or inability to communicate via email occur.

  As described above, there are a plurality of types of signals generated by the operation of the TV tuner unit 12, and it is possible to verify whether or not the interference signal of the mobile phone signal is generated for all of the plurality of types of signals. Sometimes it takes a lot of time and a lot of effort.

  In this embodiment, it is determined whether or not the mobile phone signal received by the mobile phone signal transmission / reception block 4 receives interference of a predetermined level or more from the TV tuner unit 12 that tunes a desired channel of the TV signal. When the telephone signal receives interference of a predetermined level or more from the TV tuner unit 12, the frequency of the tuning signal of the TV tuner unit 12 is automatically changed. Note that the frequency of the tuning signal of the television tuner unit 12 is changed within a range in which the television signal corresponding to the desired television channel can be tuned.

  Specifically, the frequency changing unit 51 determines that the cellular phone signal is poor when the TV tuner unit 12 is in operation, and the cellular phone signal detects a reception level equal to or higher than a certain reception level in the cellular phone signal. It is determined that the signal is receiving interference of a predetermined level or more from the TV tuner unit 12.

  When the frequency changing unit 51 determines that the mobile phone signal has received interference of a predetermined level or more from the TV tuner unit 12, the frequency of the first tuning signal output from the TV tuner synthesizer unit 12b and the TV tuner synthesizer unit The frequency of the second tuning signal output by 12c is changed within a predetermined range at regular frequency intervals until the degradation of the reception line quality of the mobile phone signal becomes less than a predetermined level.

  For example, in this embodiment, when the reception level is not less than AdBμ when the TV tuner unit 12 is not operating, the reception line quality is hardly judged as “bad” but judged as “medium” or “good”. If the reception line quality is determined to be “bad” while the TV tuner unit 12 is in operation and the reception level is AdBμ or higher, the mobile phone signal receives interference of a predetermined level or higher from the TV tuner unit 12. It is predicted that

  In the present embodiment, when the TV tuner unit 12 is in operation and the reception line quality is determined to be “bad” and the reception level is AdBμ or higher, the reception line quality is changed from “bad” to “medium” or “ The frequency of the first tuning signal output from the TV tuner synthesizer unit 12b and the frequency of the second tuning signal output from the TV tuner synthesizer unit 12c are changed until “good”.

Here, in the double superheterodyne reception radio unit 12a as shown in FIG.
(1) Frequency of television signal−first local frequency = frequency of television first frequency signal (2) frequency of television first frequency signal−second local frequency = frequency of television second frequency signal From equation (2),
(3) Frequency of television signal−first local frequency−second local frequency = frequency of television second frequency signal (4) frequency of television signal−frequency of television second frequency signal = first local frequency + first Here, the frequency of the television second frequency signal cannot be changed because the frequency of the television signal is constant and the bandwidth of the SAW filter 12a6 that passes the frequency of the television second frequency signal is narrow. The value of 1st local frequency + 2nd local frequency becomes a fixed value.

  Therefore, the frequency changing unit 51 determines that the reception line quality is “bad” to “medium” when the reception channel quality is determined to be “bad” and the reception level is AdBμ or more while the TV tuner unit 12 is operating. The frequency of the first tuning signal output from the TV tuner synthesizer unit 12b and the TV tuner are within a range in which the value of the first local frequency + the second local frequency becomes a constant value until “good” or “good”. The frequency of the second tuning signal output from the synthesizer unit 12c is changed.

  For example, the TV tuner synthesizer unit 12b outputs a first tuning signal having a first local frequency of 1322 MHz, and the TV tuner synthesizer unit 12c outputs a second tuning signal having a second local frequency of 1160 MHz. In this case, when a cellular phone signal having a frequency of 1484 MHz is received, the first local frequency is changed from 1322 MHz to 1320 MHz, and the second local frequency is changed from 1160 MHz to 1162 MHz.

  When the first local frequency is changed from 1322 MHz to 1320 MHz and the second local frequency is changed from 1160 MHz to 1162 MHz, the signal generated in the active element in the TV tuner unit 12 is 1320 MHz × 2-1116 MHz = 1478 MHz. The frequency of the received cellular phone signal (1484 MHz) is not the same, and frequency interference can be avoided.

  When the reception line quality does not become “bad” due to the change between the first local frequency and the second local frequency, the frequency changing unit 51 displays the mobile phone signal channel indicating the frequency of the currently received mobile phone signal. TV tuner frequency setting by associating (mobile phone CH), the TV channel (TVCH) tuned by the TV tuner unit 12, the changed first local frequency, and the changed second local frequency. Store in the memory unit 14.

  FIG. 3 is a diagram illustrating an example of information stored in the television tuner frequency setting memory unit 14.

  In FIG. 3, the TV tuner frequency setting memory unit 14 includes a mobile phone CH column 14a, a TV CH column 14b, a first local frequency column 14c, and a second local frequency column 14d.

  The mobile phone CH column 14a, the television CH column 14b, the first local frequency column 14c, and the second local frequency column 14d are associated in the row direction. In the case of FIG. 3, for example, the mobile phone CH280, the television CH3, the first local frequency 1320 MHz, and the second local frequency 1162 MHz are in the same row, so they are associated with each other.

  When the frequency changing unit 51 receives a cellular phone signal selected by the user by operating the key 11, the channel selected by the user operating the key 11, that is, the TV tuner unit 12 is tuned. It is determined whether or not the frequency of the tuning signal associated with the desired channel and the mobile phone CH corresponding to the received mobile phone signal is stored in the TV tuner frequency setting memory unit 14.

  When the frequency of the tuning signal associated with the channel tuned by the TV tuner unit 12 and the channel according to the received mobile phone signal is stored in the TV tuner frequency setting memory unit 14. The frequency of the tuning signal of the TV tuner unit 12 is stored in the TV tuner frequency setting memory unit in association with the channel tuned by the TV tuner unit 12 and the channel corresponding to the received mobile phone signal. Change to the frequency of the tuning signal.

  For example, when information as shown in FIG. 3 is stored in the TV tuner frequency setting memory unit 14, the channel corresponding to the received mobile phone signal is “280” and the TV tuner unit 12 tunes. When the channel being “3” is present, the frequency changing unit 51 uses the first local frequency “1320 MHz” and the second local frequency “1162 MHz” associated with the mobile phone CH “280” and the TVCH “3”. Is read out.

  Subsequently, the frequency changing unit 51 changes the frequency of the first tuning signal output from the TV tuner synthesizer unit 12b to the read first local frequency “1320 MHz”, and the first output from the TV tuner synthesizer unit 12c. The frequency of the tuning signal 2 is changed to the read second local frequency “1162 MHz”.

  Next, the operation will be described.

  FIG. 4 is a flowchart for explaining the operation of the mobile phone with a TV signal receiving function shown in FIG.

  Hereinafter, with reference to FIG. 4, the operation of the mobile phone with a TV signal receiving function shown in FIG. 1 will be described.

  Note that the TV tuner synthesizer frequency setting change determination unit 51c has a variable n indicating the number of changes of the first local frequency and the second local frequency. In the initial state, the variable n is set to n = 1. It shall be.

  When a mobile phone signal is received by the mobile phone signal transmission / reception block 4 (step 402) in a normal state, specifically, a state where no mobile phone signal is received (step 401), the mobile phone signal transmission / reception block 4 The frequency changing unit 51 is notified that the telephone signal has been received.

  When receiving the notification that the frequency changing unit 51 has received the mobile phone signal, the TV tuner synthesizer frequency setting change determining unit 51c in the frequency changing unit 51 is based on the determination result of the TV tuner power on / off determining unit 52, It is confirmed whether the power source of the TV tuner unit 12 is on (step 403).

  If the power of the TV tuner unit 12 is on in step 403, the TV tuner synthesizer frequency change determination unit 51c confirms the line quality of the received mobile phone signal based on the output of the reception line quality determination unit 51a ( Step 404).

  If no mobile phone signal is received in step 402, the normal state of step 401 is restored. In step 403, if the power of the TV tuner unit 12 is not turned on, the mobile phone signal receiving operation (step 410) is started.

  If it is determined in step 404 that the received line quality is “bad”, the television tuner synthesizer frequency change determination unit 51c confirms the reception level of the received mobile phone signal based on the output of the reception level determination unit 51b. Whether the reception level is equal to or higher than the level AdBμ at which the line quality of the received cellular phone signal is “medium” when the TV tuner unit 12 is not operating (step 405).

  If the line quality is not “bad” in step 404, the process proceeds to step 410.

  In step 405, when the TV tuner synthesizer frequency setting change determination unit 51c confirms that the line quality is “bad” and the reception level is equal to or higher than AdBμ, the reception level is higher than the predetermined line quality. Since the line quality is low even though the level is possible, there is an interference wave of the mobile phone signal, specifically, an interference wave generated from the TV tuner unit 12 to the received mobile phone signal. It is determined that the telephone signal is receiving interference of a predetermined level or more from the TV tuner unit 12.

  When the TV tuner synthesizer frequency setting change determination unit 51c determines that the received mobile phone signal has received interference of a predetermined level or more from the TV tuner unit 12, a TV tuner synthesizer frequency calculation unit 51d.

  The TV tuner synthesizer frequency calculation unit 51d that has received the signal for instructing the frequency change has changed the first local frequency of the TV tuner synthesizer unit 12b by −B kHz × n from the initial value, and the TV tuner synthesizer unit. The second local frequency of 12c is calculated to obtain a frequency that is changed by + B kHz × n from its initial value, and the two calculated frequencies are sent to the television tuner synthesizer frequency setting unit 51e.

  It is assumed that the initial value of the first local frequency is stored in the television tuner synthesizer frequency calculation unit 51d. Further, it is assumed that the initial value of the second local frequency is stored in the television tuner synthesizer frequency calculation unit 51d.

  The TV tuner synthesizer frequency setting unit 51e sets a frequency changed by −B kHz × n from the initial value of the first local frequency calculated by the TV tuner synthesizer frequency calculation unit 51d to the TV tuner synthesizer unit 12b. Set data for output. The TV tuner synthesizer unit 12b sets the first local frequency to the frequency indicated by the frequency setting data.

  The TV tuner synthesizer frequency setting unit 51e sets a frequency changed by + B kHz × n from the initial value of the second local frequency calculated by the TV tuner synthesizer frequency calculation unit 51d to the TV tuner synthesizer unit 12c. Output the setting data. The TV tuner synthesizer unit 12c sets the second local frequency to the frequency indicated by the frequency setting data.

  The TV tuner frequency setting change determination unit 28 determines whether the value of the variable n indicating the frequency change frequency of the TV tuner synthesizer unit is C times or more (step 407), and if the variable n is C-1 times or less. For example, the line quality of the cellular phone signal received under the local frequency changed in step 406 is confirmed (step 408).

  Here, C will be described.

  In the reception radio unit 12a in the TV tuner unit 12, the frequency of the first intermediate frequency signal is shifted in order to shift the first local frequency. However, the amount of shifting the frequency of the first intermediate frequency signal is also limited due to the bandwidth relationship of the SAW filter 12a4 shown in FIG. The above-mentioned C defines the shifting limit value. In this embodiment, the shifting limit value is defined as ± (B × C) kHz, and the range defined by this ± (B × C) kHz is: Even if the frequency of the first and second tuning signals is changed, the channel tuned by the television tuning unit 12, specifically, the range set by the user with the key 11 is maintained. Set as appropriate.

  In step 407, when the variable n is equal to or greater than C, even if the local frequency of the TV tuner unit 12 is shifted, the deterioration of the line quality of the mobile phone signal is not improved. Since it is predicted that the deterioration is caused by a different cause from the tuning signal of the tuner unit 12, the process proceeds to step 410.

  If it is confirmed in step 405 that the reception level is equal to or lower than AdBμ, it is likely that the line quality is poor due to the low reception level.

  If it is determined in step 408 that the received channel quality is “bad”, the television tuner synthesizer frequency setting change determination unit 51c adds 1 to the variable n (step 411), and the process returns to step 405.

  If the received channel quality is no longer “bad” in step 408, the TV tuner synthesizer frequency setting change determination unit 51c transmits a signal indicating that the received channel quality is no longer “bad” to the TV tuner synthesizer frequency calculation unit. 51d.

  When the TV tuner synthesizer frequency calculation unit 51d receives a signal indicating that the reception line quality is no longer “bad”, the currently received mobile phone CH, the TV channel tuned by the TV tuner unit 12, and the changed channel The first local frequency and the second local frequency after the change are associated with each other and stored in the television tuner frequency setting memory unit 14 (step 409), and the process proceeds to step 410.

  In this embodiment, when it is determined that the mobile phone signal is receiving interference of a predetermined level or higher from the TV tuner unit 12, the frequency of the tuning signal is automatically changed, so that the signal is generated based on the tuning signal. It is possible to prevent the signal from adversely affecting the cellular phone signal, and it is possible to prevent deterioration of call characteristics when viewing video and audio based on the television signal.

  FIG. 5 is a flowchart for explaining the operation of changing the frequency of the tuning signal used by the TV tuner unit 12 using the information stored in the TV tuner frequency setting memory unit 14.

  Hereinafter, an operation of changing the frequency of the tuning signal used by the TV tuner unit 12 using the information stored in the TV tuner frequency setting memory unit 14 will be described with reference to FIG.

  When a mobile phone signal is received by the mobile phone signal transmission / reception block 4 (step 502) in a normal state, specifically, a state where no mobile phone signal is received (step 501), the mobile phone signal transmission / reception block 4 The frequency change unit 51 is notified that the telephone signal has been received.

  When receiving the notification that the frequency changing unit 51 has received the mobile phone signal, the TV tuner synthesizer frequency setting change determining unit 51c in the frequency changing unit 51 is based on the determination result of the TV tuner power on / off determining unit 52, It is confirmed whether the power source of the TV tuner unit 12 is on (step 503).

  If the power of the TV tuner unit 12 is on in step 503, the TV tuner synthesizer frequency setting change determination unit 51c checks the mobile phone CH and TVCH stored in the TV tuner frequency setting memory unit 14 ( Step 504).

  If the information stored in the TV tuner frequency setting memory unit 14 includes a combination in which the currently received mobile phone CH and the currently tuned TVCH are stored in association with each other (step 505), the TV The tuner synthesizer frequency setting change determination unit 51c causes the television tuner frequency setting memory unit 14 to output the first and second local frequencies stored in association with the combination to the television tuner synthesizer frequency setting unit 51e.

  The TV tuner synthesizer frequency setting unit 51e outputs frequency setting data for setting the first local frequency supplied from the TV tuner frequency setting memory unit 14 to the TV tuner synthesizer unit 12b. The TV tuner synthesizer unit 12b sets the first local frequency to the frequency indicated by the frequency setting data.

  The TV tuner synthesizer frequency setting unit 51e outputs frequency setting data for setting the second local frequency supplied from the TV tuner frequency setting memory unit 14 to the TV tuner synthesizer unit 12c. The TV tuner synthesizer unit 12c sets the second local frequency to the frequency indicated by the frequency setting data (step 506).

  When step 506 is completed, the operation proceeds to a mobile phone signal reception operation (step 507).

  If no mobile phone signal is received in step 502, the process returns to step 501.

  If it is determined in step 503 that the TV tuner unit 12 is not turned on, the process proceeds to step 507.

  If the combination stored in association with the CH of the currently received mobile phone signal and the currently tuned TV CH is not stored in the TV tuner frequency setting memory unit 14 in step 505, the tuning is performed. The frequency of the signal for use (local frequency) is changed (step 508).

  The specific processing content of step 508 is the same as the operation after step 404 shown in FIG.

  In this embodiment, based on the information stored in the TV tuner frequency setting memory unit 14, the frequency of the tuning signal of the TV tuner unit 12 can be changed to a frequency that does not adversely affect the mobile phone signal. It is possible to prevent deterioration of call characteristics when viewing video and audio based on a television signal.

 Next, another embodiment of the present invention will be described.

  FIG. 6 is a block diagram showing a mobile phone with a TV signal receiving function according to another embodiment of the present invention. In FIG. 6, the same components as those in FIG.

  An outline of a mobile phone with a TV signal receiving function of another embodiment of the present invention shown in FIG. 6 is as follows.

  The embodiment shown in FIG. 1 reduces the adverse effect on the mobile phone signal caused by the tuning signal of the TV tuner unit 12, but the adverse effect on the mobile phone signal caused by the TV tuner unit 12 is as follows. This also occurs due to the positional relationship between the antenna that receives the cellular phone signal and the TV tuner unit 12.

  For example, when the distance between the antenna 2 and the TV tuner unit 12 is shorter than the distance between the antenna 1 and the TV tuner unit 12, the mobile phone signal is received from the TV tuner unit 12 via the antenna 2. When receiving a mobile phone signal via the antenna 1, the TV tuner unit 12 may not be adversely affected.

  One feature of the embodiment shown in FIG. 6 is that when the received mobile phone signal receives interference of a predetermined level or more from the TV tuner unit 12, the antenna for receiving the mobile phone signal is switched, and the TV The cellular phone signal can be received using an antenna that is not adversely affected by the tuner unit 12.

  6 is different from the mobile phone with a TV signal receiving function shown in FIG. 1 in that an antenna switching unit 54 is added instead of the frequency changing unit 51 shown in FIG. 1 includes an antenna path determination unit 54a and an antenna path switching control unit 54b instead of the TV tuner synthesizer frequency setting change determination unit 51c shown in FIG. 1, and an antenna instead of the TV tuner frequency setting memory unit 14. A path memory unit 16 is added.

  In FIG. 6, the antenna switching unit 54 includes a reception line quality determination unit 51a, a reception level determination unit 51b, an antenna path determination unit 54a, and an antenna path switching control unit 54b.

  Based on the mobile phone signal received by the antenna selected by the antenna path switching unit 41 as the antenna selection unit, the antenna switching unit 54 determines whether or not the mobile phone signal has received interference of a predetermined level or more from the TV tuner unit 12. And when it is determined that the mobile phone signal has received interference of a predetermined level or more from the TV tuner unit 12, the antenna path switching unit 41 selects the antenna path among the plurality of antennas. The switching unit 41 switches to an antenna different from the selected antenna.

  The antenna path determination unit 54a is performed by the TV tuner power on / off determination unit 52 and the result of the reception channel quality determination performed by the reception channel quality determination unit 51a, the result of the reception level determination performed by the reception level determination unit 51b. The mobile phone signal transmission / reception block 4 determines that the mobile phone signal received by the mobile phone signal transmission / reception block 4 has received interference of a predetermined level or more from the TV tuner unit 12 based on the ON / OFF determination of the TV tuner unit 12. 4 determines whether to use the antenna 1 or the antenna 2 as an antenna for receiving the mobile phone signal when it is determined that the mobile phone signal received by the mobile phone 4 has received interference of a predetermined level or more from the TV tuner unit 12. The determination result is output to the antenna path switching control unit 54b.

  Note that the antenna switching unit 54, specifically, the antenna path determination unit 54a, includes a result of the reception channel quality determination performed by the reception channel quality determination unit 51a and a result of the reception level determination performed by the reception level determination unit 51b. Based on the above, when the line quality of the mobile phone signal received by the mobile phone signal transmission / reception block 4 is lower than a predetermined level and the reception level of the mobile phone signal received by the mobile phone signal transmission / reception block 4 is higher than the predetermined reception level. Then, it is determined that the mobile phone signal received by the mobile phone signal transmission / reception block 4 has received interference of a predetermined level or more from the TV tuner unit 12.

  The antenna path switching control unit 54b controls the antenna path switching unit 41 according to the determination result of the antenna path determination unit 54a, and the antenna path switching unit 41 serves as an antenna for receiving a mobile phone signal. The antenna corresponding to the determination result is selected.

  In addition, the determination result of the reception channel quality determination unit 51a after the antenna switching operation of the antenna path switching unit 41 is improved from the determination result of the reception channel quality determination unit 51a before the antenna switching operation (the channel quality is improved). In this case, the antenna path determination unit 54a obtains the currently received mobile phone CH, the channel (TVCH) tuned by the TV tuner unit 12, and the antenna information indicating the antenna currently selected by the antenna path switching unit 41. The data are stored in the antenna path memory unit 16 in association with each other.

  In this embodiment, when the channel quality is “bad” and it is confirmed that the reception level is equal to or higher than AdBμ, there is a possibility that an interference wave (interference wave from the TV tuner unit 12) may exist. Specifically, if the antenna path switching unit 41 switches the antenna selected for the cellular phone signal to another antenna and the line quality does not become “bad” due to this antenna switching, the currently received cellular phone CH The channel tuned by the television tuner unit 12 and the antenna information indicating the antenna currently selected by the antenna path switching unit 41 are associated with each other and stored in the antenna path memory unit 16.

  When the mobile phone signal is received in the case where the mobile phone CH, the TVCH, and the antenna information are associated and stored in the antenna path memory unit 16, the antenna switching unit 54 receives a channel (which is tuned by the TV tuner unit 12). TVCH) and the antenna information associated with the channel (mobile phone CH) corresponding to the received mobile phone signal are determined in the antenna path memory unit 16.

  The antenna switching unit 54, more specifically, the antenna path determination unit 54a, includes antenna information associated with the channel tuned by the TV tuner unit 12 and the channel corresponding to the received mobile phone signal. Is stored in the channel, the antenna path switching control unit 54b is controlled to change the antenna selected by the antenna path switching unit 41 to the channel tuned by the TV tuner unit 12 and the received mobile phone signal. The antenna is changed to the antenna indicated by the antenna information stored in the antenna path memory unit 16 in association with the corresponding channel.

  Next, the operation will be described.

  FIG. 7 is a flowchart for explaining the operation of the mobile phone with a TV signal receiving function shown in FIG. In FIG. 7, the same reference numerals are assigned to the same processing operations as those shown in FIG.

  Hereinafter, the operation of the mobile phone with a TV signal reception function shown in FIG. 6, specifically, the operation different from the processing operation shown in FIG. 4 will be mainly described with reference to FIG.

  In Step 404 and Step 405, when the antenna path determination unit 54a confirms that the line quality in the mobile phone signal is “bad” and the reception level is AdBμ or higher, the reception level of the mobile phone signal is set to the predetermined value. However, since the line quality is poor but the line quality is poor, the interference wave of the cellular phone signal, specifically, the interference wave generated from the TV tuner unit 12 to the received cellular phone signal is generated. It is determined that the received mobile phone signal has received interference of a predetermined level or more from the TV tuner unit 12.

  If it is confirmed in step 405 that the line quality in the mobile phone signal is “bad” and the reception level is AdBμ or higher, the antenna path determination unit 54a selects the current antenna path switching unit 41 for the mobile phone signal. The other antenna is changed to another antenna (step 701).

  Specifically, the antenna path determination unit 54a instructs the antenna path switching control unit 54b to switch the antenna when confirming that the line quality in the mobile phone signal is “bad” and the reception level is AdBμ or higher. The antenna switching signal to be output is output.

  The antenna path switching control unit 54b controls the antenna path switching unit 41 in accordance with the antenna switching signal output from the antenna path determination unit 54a, and the antenna currently selected by the antenna path switching unit 41 for cellular phone signals. Change to a different antenna.

  When the determination result of the received channel quality determining unit 51a after the antenna switching operation of the antenna path switching unit 41 is improved (the channel quality is improved) from the determination result of the received channel quality determining unit 51a before performing the antenna switching operation ( In step 408), the antenna path determination unit 54a associates the currently received mobile phone CH, the channel tuned by the TV tuner unit 12, and the antenna currently selected by the antenna path switching unit 41 with the antenna path. The data is stored in the memory unit 16 (step 702).

  If it is determined in step 408 that the received line quality is “bad” even if the antenna is changed, the process proceeds to step 410.

  In this embodiment, when it is determined that the mobile phone signal is receiving interference of a predetermined level or higher from the TV tuner unit 12, the antenna that automatically receives the mobile phone signal is changed. It is possible to prevent the generated signal from adversely affecting the cellular phone signal, and it is possible to prevent deterioration of call characteristics when viewing video and audio based on the television signal.

  FIG. 8 is a flowchart for explaining an operation of changing an antenna for receiving a mobile phone signal using information stored in the antenna path memory unit 16. In FIG. 8, the same reference numerals are assigned to the same processing operations as those shown in FIG.

  Hereinafter, with reference to FIG. 8, the operation of changing the antenna that receives the mobile phone signal using the information stored in the antenna path memory unit 16 will be described.

  When a mobile phone signal is received by the mobile phone signal transmission / reception block 4 (step 502) in a normal state, specifically, a state where no mobile phone signal is received (step 501), the mobile phone signal transmission / reception block 4 The antenna switching unit 54 is notified that the telephone signal has been received.

  When the notification that the antenna switching unit 54 has received the mobile phone signal is received, the antenna path determination unit 54 a in the antenna switching unit 54 is based on the determination result of the TV tuner power on / off determination unit 52. It is confirmed whether or not the power supply of is turned on (step 503).

  If the power source of the TV tuner unit 12 is on in step 503, the antenna path determination unit 54a checks the mobile phone CH and the TV CH stored in the antenna path memory unit 16 (step 801).

  In the information stored in the antenna path memory unit 16, if there is a combination in which the CH of the currently received mobile phone signal and the TV CH currently being tuned are stored in association with each other (step 802), The antenna path determination unit 54a causes the antenna stored in association with the combination to be output from the antenna path memory unit 16 to the antenna path switching control unit 54b.

  The antenna path switching control unit 54 b supplies a signal for selecting the antenna supplied from the antenna path memory unit 16 to the antenna path switching unit 41, and sends the antenna path switching unit 41 to the antenna path switching unit 41 from the antenna path memory unit 16. The supplied antenna is selected (step 803).

  When step 803 is completed, the operation proceeds to a mobile phone signal reception operation (step 507).

  If no mobile phone signal is received in step 502, the process returns to step 501.

  If it is determined in step 503 that the TV tuner unit 12 is not turned on, the process proceeds to step 507.

  If the combination stored in association with the CH of the currently received mobile phone signal and the currently tuned TV CH is not stored in the antenna path memory unit 16 in step 802, the antenna path is switched. The antenna selected by the unit 41 is changed (step 804).

  The specific processing content of step 804 is the same as the operation after step 404 shown in FIG.

  In this embodiment, the antenna that receives the cellular phone signal can be changed to an antenna that does not adversely affect the cellular phone signal based on the information stored in the antenna path memory unit 16, so that the video based on the television signal can be easily obtained. In addition, it is possible to prevent deterioration of the call characteristics when listening to the voice.

  In each of the embodiments described above, the illustrated configuration is merely an example, and the present invention is not limited to the configuration.

It is the block diagram which showed the mobile telephone with a television signal receiving function of one Example of this invention. It is the block diagram which showed an example of the receiving radio | wireless part 12a shown in FIG. It is explanatory drawing which showed an example of the information stored in the memory part 14 for television tuner frequency settings shown in FIG. 3 is a flowchart for explaining the operation of the mobile phone with a TV signal receiving function according to the embodiment of the present invention shown in FIG. 3 is a flowchart for explaining the operation of the mobile phone with a TV signal receiving function according to the embodiment of the present invention shown in FIG. It is the block diagram which showed the mobile telephone with a television signal receiving function of the other Example of this invention. It is a flowchart for demonstrating operation | movement of the mobile telephone with a television signal receiving function of one Example of this invention shown in FIG. It is a flowchart for demonstrating operation | movement of the mobile telephone with a television signal receiving function of one Example of this invention shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Antenna 2 Antenna 3 Signal distributor 4 Mobile phone signal transmission / reception block 41 Antenna path switching part 42 Reception radio | wireless part 43 Mobile phone synthesizer part 44 Transmission radio | wireless part 45 Baseband part 5 MCPU
51 frequency change unit 51a reception line quality determination unit 51b reception level determination unit 51c TV tuner synthesizer frequency setting change determination unit 51d TV tuner synthesizer frequency calculation unit 51e TV tuner synthesizer frequency setting unit 52 TV tuner power on / off determination unit 53 mobile phone Synthesizer frequency setting unit 54 Antenna switching unit 54a Antenna path determination unit 54b Antenna path switching control unit 6 Driver unit 7 Speaker 8 Display unit 9 Power supply 10 User IF unit 11 Key 12 TV tuner unit 12a Reception radio unit 12b TV tuner synthesizer unit 12c TV Tuner synthesizer section 12d Video IF section Sound IF section 13 Decoder section 14 TV tuner frequency setting memory section 15 TV tuner power on / off section 6 antenna path memory section

Claims (14)

A television tuner unit for tuning a desired channel of a television signal using a tuning signal generated to tune a desired channel selected by a user;
A mobile phone signal receiver for receiving a mobile phone signal;
Based on the mobile phone signal received by the mobile phone signal receiving unit, it is determined whether the mobile phone signal has received interference of a predetermined level or more from the TV tuner unit, and the mobile phone signal is received from the TV tuner unit. A frequency changing unit that changes the frequency of the tuning signal of the TV tuner unit when it is determined that the interference of the predetermined level or more is received,
The mobile phone with a TV signal receiving function, wherein the TV tuner unit tunes the desired channel using a tuning signal whose frequency is changed by the frequency changing unit. The mobile phone with a television signal receiving function according to claim 1,
A storage unit,
The frequency changing unit is
When the interference with the mobile phone signal of the TV tuner unit becomes lower than the predetermined level due to the change in the frequency of the tuning signal, the frequency of the tuning signal after the change and a desired value of the TV signal A channel and a mobile phone signal channel indicating a frequency of the mobile phone signal are associated with each other and stored in the storage unit;
When the mobile phone signal receiving unit receives the mobile phone signal, the mobile phone signal indicates the channel of the TV signal tuned by the TV tuner unit and the frequency of the mobile phone signal received by the mobile phone signal receiving unit. When the frequency of the tuning signal associated with the channel is stored in the storage unit, the frequency of the tuning signal of the TV tuner unit is set to the channel of the TV signal being tuned by the TV tuner unit. A television signal receiving function for changing to a frequency of a tuning signal stored in the storage unit in association with a mobile phone signal channel indicating a frequency of a mobile phone signal received by the mobile phone signal receiving unit Mobile phone. The mobile phone with a television signal receiving function according to claim 1 or 2,
The television tuner unit includes: a television signal receiving unit that receives a television signal; a first tuning signal output unit that outputs a first tuning signal; a television signal received by the television signal receiving unit; A first mixer that generates a first intermediate frequency signal by mixing the first tuning signal output from the first tuning signal output unit, and outputs the generated first intermediate frequency signal; A first filter that extracts a signal of a desired frequency including the first intermediate frequency signal from an output signal of one mixer, a second tuning signal output unit that outputs a second tuning signal, and The signal of the desired frequency extracted by the first filter and the second tuning signal output from the second tuning signal output unit are mixed to obtain the second A second mixer for generating an inter-frequency signal and outputting the generated second intermediate frequency signal; and a second filter for extracting the second intermediate frequency signal from the output signal of the second mixer ,
The frequency changing unit is configured to output a first tuning signal output unit when the mobile phone signal received by the mobile phone signal receiving unit receives interference of a predetermined level or more from the TV tuner unit. A mobile phone with a TV signal receiving function, wherein the frequency of the tuning signal and the frequency of the second tuning signal output from the second tuning signal output unit are changed. The mobile phone with a TV signal receiving function according to any one of claims 1 to 3,
The frequency changing unit is configured such that the line quality of the mobile phone signal received by the mobile phone signal receiving unit is lower than a predetermined level, and the reception level of the mobile phone signal received by the mobile phone signal receiving unit is lower than a predetermined reception level. A mobile phone with a TV signal receiving function, wherein the mobile phone signal determines that the mobile phone signal is receiving interference of a predetermined level or more from the TV tuner. A TV tuner for tuning the desired channel of the TV signal;
Multiple antennas for receiving mobile phone signals;
An antenna selector for selecting one antenna from the plurality of antennas;
Based on the mobile phone signal received through the antenna selected by the antenna selection unit, it is determined whether the mobile phone signal is receiving interference of a predetermined level or more from the TV tuner unit, the mobile phone signal And an antenna switching unit that switches the antenna selected by the antenna selection unit to an antenna different from the antenna when it is determined that interference of a predetermined level or more is received from the TV tuner unit. Mobile phone with signal reception function. In the mobile phone with a television signal receiving function according to claim 5,
A storage unit,
The antenna switching unit is
When the interference of the TV tuner unit with the cellular phone signal becomes lower than the predetermined level due to the switching of the antenna selected by the antenna selection unit, the antenna information indicating the antenna after the switching and the TV signal A desired channel and a mobile phone signal channel indicating the frequency of the mobile phone signal are associated with each other and stored in the storage unit,
When the mobile phone signal receiving unit receives the mobile phone signal, the mobile phone signal indicates the channel of the TV signal tuned by the TV tuner unit and the frequency of the mobile phone signal received by the mobile phone signal receiving unit. When the antenna information associated with the channel is stored in the storage unit, the antenna selected by the antenna selection unit is the channel of the TV signal and the mobile phone signal received by the TV tuner unit. A mobile phone with a TV signal receiving function, wherein the antenna is switched to an antenna indicated by antenna information stored in the storage unit in association with a mobile phone signal channel indicating a frequency of a mobile phone signal received by the unit. The mobile phone with a TV signal receiving function according to claim 5 or 6,
In the antenna switching unit, the line quality of the mobile phone signal received by the mobile phone signal receiving unit is lower than a predetermined level, and the reception level of the mobile phone signal received by the mobile phone signal receiving unit is lower than a predetermined reception level. A mobile phone with a TV signal receiving function, wherein the mobile phone signal determines that the mobile phone signal is receiving interference of a predetermined level or more from the TV tuner. A TV tuner unit that tunes a desired channel of a TV signal using a tuning signal generated to tune a desired channel selected by a user, and a mobile phone signal receiver that receives a mobile phone signal An interference prevention method performed by a mobile phone with a TV signal reception function including:
An interference determination step of determining whether or not the mobile phone signal is receiving interference of a predetermined level or more from the TV tuner unit based on the mobile phone signal received by the mobile phone signal receiving unit;
A first frequency changing step of changing a frequency of the tuning signal when the interference determining step determines that the mobile phone signal is receiving interference of the predetermined level or more from the television tuner unit;
And a tuning step of tuning a desired channel of the television signal using the tuning signal whose frequency is changed in the first frequency changing step. Method. In the interference prevention method of the mobile telephone with a television signal receiving function according to claim 8,
When the frequency of the tuning signal in the first frequency changing step changes the interference with the mobile phone signal of the TV tuner unit below the predetermined level, the tuning signal after the change A storage step of associating a frequency, a desired channel of the television signal, and a mobile phone signal channel indicating the frequency of the mobile phone signal in a storage unit;
When the mobile phone signal receiving unit receives the mobile phone signal, the mobile phone signal indicates the channel of the TV signal tuned by the TV tuner unit and the frequency of the mobile phone signal received by the mobile phone signal receiving unit. When the frequency of the tuning signal associated with the channel is stored in the storage unit, the frequency of the tuning signal of the TV tuner unit is set to the channel of the TV signal being tuned by the TV tuner unit. A second frequency changing step of changing to a frequency of a tuning signal stored in the storage unit in association with a mobile phone signal channel indicating a frequency of the mobile phone signal received by the mobile phone signal receiving unit. An interference prevention method for a cellular phone with a TV signal receiving function. In the interference prevention method of the mobile telephone with a television signal receiving function according to claim 8 or 9,
The television tuner unit includes: a television signal receiving unit that receives a television signal; a first tuning signal output unit that outputs a first tuning signal; a television signal received by the television signal receiving unit; A first mixer that generates a first intermediate frequency signal by mixing the first tuning signal output from the first tuning signal output unit, and outputs the generated first intermediate frequency signal; A first filter that extracts a signal of a desired frequency including the first intermediate frequency signal from an output signal of one mixer, a second tuning signal output unit that outputs a second tuning signal, and The signal of the desired frequency extracted by the first filter and the second tuning signal output from the second tuning signal output unit are mixed to obtain the second A second mixer for generating an inter-frequency signal and outputting the generated second intermediate frequency signal; and a second filter for extracting the second intermediate frequency signal from the output signal of the second mixer ,
In the first frequency changing step, when the mobile phone signal received by the mobile phone signal receiving unit receives interference of a predetermined level or more from the TV tuner unit, the first tuning signal output unit outputs A method for preventing interference of a mobile phone with a TV signal receiving function, wherein the frequency of the first tuning signal to be changed and the frequency of the second tuning signal output from the second tuning signal output unit are changed . In the interference prevention method of the mobile phone with a television signal receiving function according to any one of claims 8 to 10,
In the interference determination step, the line quality of the mobile phone signal received by the mobile phone signal receiver is lower than a predetermined level, and the reception level of the mobile phone signal received by the mobile phone signal receiver is lower than a predetermined reception level. If the mobile phone signal is too high, it is determined that the mobile phone signal is receiving interference of a predetermined level or more from the TV tuner unit. An interference prevention method performed by a mobile phone with a TV signal receiving function including a TV tuner unit that tunes a desired channel of a TV signal and a plurality of antennas that receive mobile phone signals,
An antenna selection step of selecting one antenna from the plurality of antennas;
An interference determination step for determining whether or not the mobile phone signal receives interference of a predetermined level or more from the TV tuner unit based on the mobile phone signal received through the antenna selected in the antenna selection step;
In the interference determination step, when it is determined that the mobile phone signal receives interference of a predetermined level or more from the TV tuner unit, the antenna selected in the antenna selection unit step is switched to an antenna different from the antenna. A method for preventing interference of a mobile phone with a TV signal receiving function, comprising: The method for preventing interference of a mobile phone with a television signal reception function according to claim 12,
When the antenna switching by the antenna switching step causes the interference of the TV tuner unit with the mobile phone signal to be lower than the predetermined level, the antenna information indicating the antenna after the switching and the desired TV signal A storage step of storing a channel and a mobile phone signal channel indicating a frequency of the mobile phone signal in association with each other;
When the mobile phone signal receiving unit receives the mobile phone signal, the mobile phone signal indicates the channel of the TV signal tuned by the TV tuner unit and the frequency of the mobile phone signal received by the mobile phone signal receiving unit. When antenna information associated with a channel is stored in the storage unit, the antenna selected in the antenna selection step is the channel of the TV signal and the mobile phone signal received by the TV tuner unit. A second antenna switching step of switching to an antenna indicated by antenna information stored in the storage unit in association with a mobile phone signal channel indicating the frequency of the mobile phone signal received by the unit A method for preventing interference of a mobile phone with a signal receiving function. In the interference prevention method of the mobile telephone with a television signal receiving function according to claim 12 or 13,
In the interference determination step, the line quality of the mobile phone signal received by the mobile phone signal receiver is lower than a predetermined level, and the reception level of the mobile phone signal received by the mobile phone signal receiver is lower than a predetermined reception level. If the mobile phone signal is too high, it is determined that the mobile phone signal is receiving interference of a predetermined level or more from the TV tuner unit.

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