JP2008263382A - Transmitter, control method of transmitter, control program of transmitter, and recording medium recorded with control program of transmitter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmitter capable of quickly controlling radio waves so that a radio wave to be outputted does not exceed a range of field strength, wherein a license determined by the radio law is not required, without requiring especially much cost. <P>SOLUTION: A communication terminal 1 includes an FM transmitter 4 for outputting a feeble radio wave determined by the radio law, a measurement part 6 for measuring the strength of the radio wave output from the FM transmitter 4, and a transmitter control instruction part 34 for controlling the strength of the radio wave output from the FM transmitter 4 according to the measured result of the measurement part 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a transmission device that transmits information to other devices using weak radio waves defined by the Radio Law, a control method for the transmission device, a control program for the transmission device, and a recording medium on which the control program for the transmission device is recorded. It is.

  There is a scene where it is desired to view audio output from a portable music playback device incorporating a small speaker with higher sound quality. In such a scene where it is required to view the sound with high sound quality, a reproduction system that can transmit and reproduce the sound to a radio receiver equipped with a larger speaker is used.

  In this playback system, the portable music playback device includes an FM transmitter, and the FM transmitter modulates an audio signal to an FM frequency and transmits the FM signal to a radio antenna of the radio receiver, thereby transmitting the audio signal to the radio receiver. Realize transmission.

  By the way, normally, the portable music player described above further includes an earphone connector for inserting an earphone for listening to sound and the like, and a charger connector for connecting to a charger for charging. The earphone cable is connected to the portable music player via the earphone connector or the charger cable via the charger connector.

  Here, when the audio signal is transmitted to the radio receiver using the FM transmitter while being connected to the earphone cable or the charger cable, the portable music player has the following problems.

  That is, when radio waves are transmitted from the FM transmitter antenna to the radio receiver in the above-described state, the radio waves may enter the earphone connector or the charger connector. Then, the earphone cable or the charger cable may play the same role as the antenna, and the radio wave may be strongly output through the earphone cable or the charger cable. As a result, radio waves with electric field strength exceeding the range stipulated by the Radio Law, that is, the range that can be used without the need to obtain a license and technical conformity certification, are transmitted from the portable music player to the radio receiver. Problems arise.

  For example, it is not necessary to obtain a radio station license according to the telephone law if the electric field strength (the strength of radio waves) at a distance of 3 meters from the device that outputs radio waves is lower than the level shown in FIG. (Non-patent Document 1). However, when the earphone cable or the charger cable plays the same role as the antenna, the level may be higher than that shown in FIG. FIG. 7 shows the prior art, and shows the allowable value of the electric field strength at a distance of 3 meters of the weak radio station.

  In consideration of such a problem, the portable music player can be configured to suppress the electric field strength (the strength of the radio wave) of the radio wave output from the FM transmitter in advance. However, when it is configured to suppress the electric field strength (the strength of the radio wave) in this way, there is a problem that the radio receiver cannot reproduce with high quality sound because the output radio wave is weak.

  Therefore, the above-described portable music player preferably has a configuration that can control the output intensity of radio waves as necessary. As a technical idea for controlling the output intensity, for example, Patent Document 1 discloses a cordless telephone having the following configuration.

  That is, a configuration is disclosed in which both the base unit and the handset of the cordless telephone feed back the received radio wave reception level to the transmission partner and control the reception level of the radio wave from the transmission partner to be constant. . By configuring in this way, the cordless telephone can achieve effective use of channels and reduction of power consumption.

Patent Document 2 also discloses a wireless communication apparatus having the following configuration. In other words, it is equipped with a detector that detects electric field strength or S / N ratio (signal-to-noise ratio), and a transmission / reception circuit that can supplement the control channel simultaneously with the channel during a call, and is optimally adapted to the radio wave environment. A wireless communication device capable of performing the above is disclosed.
JP 4-130847 A (published on May 1, 1992) Japanese Patent Laid-Open No. 4-180414 (released on June 26, 1992) Ministry of Internal Affairs and Communications Shin-Etsu Communications Bureau, aiming for a safe and secure society using ICT [online], March 26, 2007, [March 28, 2007 search], Internet <URL: http: / /www.shinetsu-bt.go.jp/sbt/denpa/bijaku/bijaku.htm>

  However, the above-described conventional configuration has a problem that the time required for controlling the transmission output on the transmission side is increased. Specifically, the above conventional configuration detects a signal received from a device on the transmission side, and transmits a control signal or a received reception level to the transmission side, thereby transmitting a transmission output from the transmission side. This is a configuration to be controlled. For this reason, the time required to control the transmission output on the transmission side increases.

  In addition, when a radio wave is transmitted from the FM transmitter antenna to the radio receiver, it may be possible to design the circuit so that the radio wave does not enter the earphone connector or the charger connector. There arises a problem that the cost required to do so increases.

  The present invention has been made in view of the above-mentioned problems, and its purpose is not to incur a particularly large cost, and the output radio wave exceeds the range of electric field strength that does not require a license defined by the Radio Law. It is to realize a transmission apparatus that can be controlled quickly so that there is no transmission method, a control method for the transmission apparatus, a control program for the transmission apparatus, and a recording medium that records the control program for the transmission apparatus.

A transmitting device according to the present invention is a transmitting device that transmits information to other devices by radio waves of electric field strength that does not require a license defined by the Radio Law in order to solve the above-described problems,
An output unit that outputs the radio wave, a measurement unit that measures the electric field strength of the radio wave output from the output unit, and the magnitude of the electric field strength of the radio wave that is output from the output unit according to the measurement result of the measurement unit And a control means for controlling.

  According to the above configuration, since the measurement unit and the control unit are provided, the electrification intensity of the radio wave output from the output unit can be measured, and the electrolysis strength of the radio wave output can be controlled according to the measurement result. As described above, the transmission apparatus according to the present invention is configured to measure the electric field strength of the output radio wave by the measurement unit included in the apparatus, and to quickly feed back the measurement result to the control means.

  For this reason, the transmitter according to the present invention has an electric field strength that increases the electric field strength of the output radio wave due to the device configuration such as a cable being connected and does not require a license defined by the Radio Law. Even if it exceeds the range, the magnitude of the electric field strength of the radio wave can be quickly reduced.

  In addition, the control method of the transmission device according to the present invention has a simple configuration in which the magnitude of the electric field strength of the output radio wave can be appropriately controlled by the control means based on the result measured by the measurement unit, and particularly a complicated circuit. Since no configuration is required, the cost for manufacturing the transmitter can be reduced.

  Therefore, the transmission device according to the present invention can be quickly controlled so that the radio wave output from the output unit does not exceed the range of the electric field strength that does not require a license defined by the Radio Law, without particularly incurring a large cost. There is an effect.

  The standard of electric field strength that does not require a license defined by the Radio Law is stipulated in the Radio Law Enforcement Rules (Article 6).

  In the transmission device according to the present invention, in the configuration described above, the control unit controls the voltage applied to the output unit, thereby controlling the electric field strength of the radio wave output from the output unit. And determining means for determining a voltage to be applied to the output unit according to a measurement result of the measuring unit, wherein the control unit applies the output unit at a voltage determined by the determining unit, It is preferable that the electric field intensity of the radio wave output from the output unit is controlled.

  According to the above configuration, since the determination unit is provided, the voltage to be applied to the output unit can be determined. For this reason, in the transmission apparatus according to the present invention, the control unit can control the output unit so as to output a radio wave having an appropriate electric field strength.

  In addition, in the above-described configuration, the transmission device according to the present invention is determined when the electric field intensity of the radio wave measured by the measurement unit exceeds the range of the electric field intensity that does not require a license defined by the Radio Law. The means is preferably configured to determine to reduce the voltage applied to the output by a predetermined magnitude.

  According to the above configuration, since the determining means determines to reduce the magnitude of the voltage applied to the output unit by a predetermined magnitude, the output radio wave does not require a license defined by the Radio Law, Even when the range is exceeded, control can be performed so as to be within this range.

  In addition, the transmitting device according to the present invention does not require a license defined by the Radio Law, and the determining means sets the electric field intensity of the output radio wave to a predetermined magnitude when the radio wave exceeds the range of the electric field intensity. Since it is the structure which reduces only uniformly, control by the control means with respect to an output part becomes easy.

  Further, in the above-described configuration, the transmission device according to the present invention stores a voltage control table indicating a correspondence relationship between information indicating the electric field strength of the radio wave measured by the measurement unit and a voltage applied to the output unit. A voltage control table storage device may be further provided, and the determining unit may be configured to determine a voltage according to a measurement result of the measuring unit as a voltage to be applied to the output unit with reference to the voltage control table. Good.

  According to the above configuration, since the voltage control table storage device is provided, it is possible to easily and quickly determine the voltage to be applied to the output unit according to the measurement result by the measurement unit. The control means can control the electric field intensity of the radio wave output from the output unit by applying the determined voltage to the output unit.

  Therefore, the transmission apparatus according to the present invention can easily and quickly control the magnitude of the electric field intensity of the radio wave output from the output unit.

  Further, in the above-described configuration, the transmission device according to the present invention includes a connection unit for connecting to a cable, a detection unit that detects whether the cable is connected to the transmission device at the connection unit, and the above-described configuration. When the detection unit detects that the cable is connected to the transmission device when the radio wave is output from the output unit, the electric field intensity of the radio wave output by the output unit is measured. And an instruction means for instructing the measurement unit.

  By the way, when the cable is connected in a configuration that outputs a radio wave having an electric field strength that does not require a license defined by the Radio Law, such as the transmission device according to the present invention, the electric field of the radio wave output by the cable is connected. It is known that the strength increases.

  According to the said structure, since the said detection means is provided, it can be detected whether the said cable is connected to the said transmitter.

  In addition, since it is equipped with instruction means, radio waves are output from the output section and the cable is connected to the transmitter, that is, the electric field strength of the output radio waves may increase. In addition, the measurement unit can be instructed to measure the electric field strength of the radio wave output from the output unit.

  For this reason, in the transmission apparatus according to the present invention, the measurement unit does not always have to be operated so as to measure the electric field strength of the radio wave output from the output unit, thereby reducing power consumption.

  Further, in the above-described configuration, the transmission device according to the present invention includes a position information acquisition unit that acquires position information indicating a position where the transmission device exists, the position information, and a position indicated by the position information. An electric field strength effect information storage device that stores electric field strength effect information that associates the degree of influence information indicating the degree of influence on the magnitude of the electric field strength of the output radio wave, and transmits the information to another device. In this case, the control means may be configured to control the voltage applied to the output unit with reference to the electric field strength effect information based on the position information acquired by the position information acquisition unit.

  Note that the influence level information is information indicating how much the electric field intensity increases or decreases compared to the electric field intensity when the radio wave is output at the ideal state when the radio wave is output at the position indicated by the position information. It is. For example, when a predetermined voltage is applied to the output unit, the difference between the electric field intensity of the radio wave output in the ideal location and the electric field intensity of the radio wave actually output at the position where the transmitting device exists is shown. Information.

  According to the above configuration, since the position information acquisition unit and the electric field strength effect information storage device are provided, the transmission device according to the present invention grasps the degree of influence on the electric field strength of the output radio wave generated in the place where the transmission device exists. can do.

  For this reason, when transmitting information to another device, the transmitting device can apply the output unit with a voltage that takes into account the degree of influence of the electric field on the electric field strength. Thereby, the transmission device according to the present invention can be adjusted in advance so as to output a radio wave having an appropriate electric field strength when transmitting information to another device.

  In order to solve the above-described problem, the control method according to the present invention outputs an electric field having electric field strength that does not require a license defined by the Radio Law, and electric field intensity of the electric wave output by the output unit. A measuring unit that measures the frequency of the radio wave output from the output unit by controlling the voltage applied to the output unit. The first step of controlling the magnitude of the electric field strength and instructing the measurement unit to measure the electric field strength of the radio wave output from the output unit, and the output according to the measurement result by the measurement unit A second step of determining a voltage to be applied to the unit, and a third step of controlling the magnitude of the electric field intensity of the output radio wave by applying the output unit at the voltage determined by the second step. Including It is characterized in.

  According to the above method, since the second step and the third step are included, the electric field intensity of the output radio wave can be measured, and the magnitude of the electric field intensity of the output radio wave can be controlled according to the measurement result. As described above, the control method of the transmitting apparatus according to the present invention can quickly measure the electric field strength of the output radio wave by the own apparatus, and feed back the measurement result to the control for the magnitude of the electric field intensity of the radio wave.

  For this reason, the transmission device control method according to the present invention increases the electric field strength of the output radio wave due to, for example, the device configuration and the like, and exceeds the range of electric field strength that does not require a license defined by the Radio Law. Even in this case, the magnitude of the electric field strength of the radio wave can be quickly reduced.

  Further, the transmission apparatus control method according to the present invention has a simple configuration in which the magnitude of the electric field strength of the output radio wave can be appropriately controlled by the second step and the third step. For this reason, the transmission device controlled by the control method of the transmission device according to the present invention does not require a particularly complicated circuit configuration, and the manufacturing cost can be suppressed.

  Therefore, the control method of the transmitting apparatus according to the present invention can be quickly controlled so that the output radio wave does not exceed the range of the electric field intensity that does not require a license defined by the Radio Law, without particularly incurring a large cost. There is an effect.

  The transmission device may be realized by a computer. In this case, a control program for the transmission device that causes the transmission device to be realized by the computer by causing the computer to operate as the above-described means, and the program are recorded. Computer-readable recording media are also within the scope of the present invention.

  As described above, the transmission device according to the present invention is a transmission device that transmits information to another device by using a radio wave having an electric field strength that does not require a license defined by the Radio Law, and an output unit that outputs the radio wave. A measuring unit that measures the electric field strength of the radio wave output by the output unit, and a control unit that controls the magnitude of the electric field strength of the radio wave output from the output unit according to the measurement result of the measuring unit; It is characterized by providing.

  Therefore, the transmission device according to the present invention can be quickly controlled so that the radio wave output from the output unit does not exceed the range of the electric field strength that does not require a license defined by the Radio Law, without particularly incurring a large cost. There is an effect.

  As described above, the control method of the transmission device according to the present invention includes the output unit that outputs a radio wave having an electric field strength that does not require a license defined by the Radio Law, and the electric field strength of the radio wave output by the output unit. A measuring device for measuring, and a method for controlling a transmitting device that transmits information to other devices by the radio wave, and controls the voltage applied to the output unit to thereby control the electric field of the radio wave output from the output unit. A first step of controlling the magnitude of the intensity, and instructing the measurement unit to measure the electric field strength of the radio wave output from the output unit; and the output unit according to a measurement result by the measurement unit And a third step of controlling the magnitude of the electric field strength of the output radio wave by applying the output unit at the voltage determined by the second step. thing And features.

  Therefore, the control method of the transmitting apparatus according to the present invention can be quickly controlled so that the output radio wave does not exceed the range of the electric field intensity that does not require a license defined by the Radio Law, without particularly incurring a large cost. There is an effect.

  An embodiment of the present invention will be described below with reference to FIGS. That is, the reproduction system 100 according to the present embodiment includes a communication terminal (transmission device) 1 that establishes communication with another communication terminal via a base station (not shown) as shown in FIG. An FM audio apparatus (another apparatus) 2 that receives audio data 52 and outputs audio based on the audio data 52 is provided. FIG. 2 shows an embodiment of the present invention and is a diagram showing a schematic configuration of the reproduction system 100.

  The communication terminal 1 can be carried and used by a user, and can be realized by, for example, a mobile phone or a PDA. As described above, the communication terminal 1 can establish communication with other communication terminals to make a call, and can send and receive e-mails, voice data, image data, and the like. The communication terminal 1 can also transmit to the FM audio apparatus 2 by radio waves (carrier waves) obtained by modulating the audio data 52 held by itself to the FM frequency. More specifically, the communication terminal 1 transmits the audio data 52 to the FM audio apparatus 2 by radio waves in the frequency range of 76 to 90 MHz via the FMTX antenna 3.

  Further, the communication terminal 1 includes an earphone connector 14 (not shown in FIG. 2) for attaching the earphone 40 to the own device and a charger connector 20 (not shown in FIG. 2) for attaching the charger 42. ing. The earphone 40 can be equipped by inserting a terminal provided at the end of the earphone cable (cable) 41 into the earphone connector 14. For this reason, the communication terminal 1 according to the present embodiment can listen to the sound reproduced using the earphone 40.

  Further, in the communication terminal 1, the communication terminal 1 can be connected to the charger 42 by inserting a terminal provided at the end of the charger cable (cable) 43 into the charger connector 20. For this reason, the communication terminal 1 according to the present embodiment charges the device power supply 19 (not shown in FIG. 2) such as a charging battery, which is held by the communication terminal 1 using the connected charger 42. You can also

(Hardware configuration of communication terminal)
Here, the hardware configuration of the communication terminal 1 will be described with reference to FIG. FIG. 3 is a block diagram showing a hardware configuration of communication terminal 1 according to the present embodiment.

  As shown in FIG. 3, in addition to the FMTX antenna 3 described above, the communication terminal 1 according to the present embodiment includes an FM transmitter 4, a detection antenna 5, a measurement unit 6, a communication antenna 8, and a communication control unit 9. , Signal processing unit 10, display control unit 11, speaker 12, microphone 13, earphone connector 14, display unit 15, operation unit 16, first memory 17, second memory (voltage control table storage device) 18, device power supply 19, In this configuration, the charger connector 20 and the main control unit 21 are provided.

  The FM transmitter 4 is for controlling the FMTX antenna 3 to transmit an audio signal modulated to the FM frequency to the FM audio apparatus 2 with a predetermined radio wave intensity. The FMTX antenna 3 is an antenna for outputting radio waves from the FM transmitter 4 to the FM audio apparatus 2. The FMTX antenna 3 and the FM transmitter 4 implement the output unit of the present invention.

  The measurement unit 6 is for measuring the electric field strength of the radio wave output from the FMTX antenna 3 to the FM audio apparatus 2. The measurement unit 6 can measure the electric field strength by measuring the voltage induced in the detection antenna 5. The measurement unit 6 transmits the received result to the main control unit 21.

  The detection antenna 5 is an antenna for receiving the radio wave in order to measure the electric field strength of the radio wave output through the FMTX antenna 3, and is an antenna whose gain is calibrated. Examples of the shape of the detection antenna include a loop antenna, a dipole antenna, a biconical antenna, a logarithmic periodic antenna, and the like, and an appropriate shape is selected according to conditions such as a measurement frequency and a place of use.

  The measurement antenna of the present invention is realized by the detection antenna 5 and the measurement unit 6.

  The communication control unit 9 controls the communication antenna 8 to establish communication with another communication terminal and perform a call, for example. The communication antenna 8 is an antenna for receiving a communication radio wave transmitted to another communication terminal or transmitted from another communication terminal under the control of the communication control unit 9.

  The signal processing unit 10 converts the audio signal input from the microphone 13 in accordance with an instruction from the main control unit 21 from analog data to digital data so as to be processed in the communication terminal 1. Also, the audio signal output to the speaker is converted from digital data to analog data and converted into a format that can be output from the speaker 12.

  The speaker 12 is converted into analog data by the signal processing unit 10 and outputs an audio signal. Microphone 13 receives an input of sound generated outside communication terminal 1 according to the present embodiment.

  The earphone connector 14 is a contact member for attaching the earphone 40 to the communication terminal 1, and performs electrical connection between the earphone cable 41 and a substrate inside the communication terminal 1. The earphone connector 14 is configured to detect the insertion of the earphone cable 41 and notify the main control unit 21 of the insertion.

  The display control unit 11 controls the display unit 15 according to an instruction from the main control unit 21 to display an image. The display unit 15 displays an image or the like according to display control by the display control unit 11 and can be realized by, for example, an LCD (liquid crystal display).

  The operation unit 16 receives an operation instruction from the user of the communication terminal 1 and can be realized by an operation key, a numeric keypad, a mouse, a keyboard, a touch panel, and the like. The communication terminal 1 according to the present embodiment is configured so that the audio data 52 can be transmitted to the FM audio apparatus 2 in accordance with an instruction from the user input from the operation unit 16.

  The first memory 17 serves as a buffer, and is realized by, for example, a RAM (random access memory). The second memory 18 plays a role of permanently storing data, and can be realized by, for example, a flash memory. The configuration of the first memory 17 and the second memory 18 that are storage devices of the communication terminal 1 can be changed as appropriate according to the specifications of the communication terminal 1.

  Further, in the communication terminal 1 according to the present embodiment, the second memory 18 stores an output voltage control table (voltage control table) 51 used in “electric field intensity control processing” described later. Details of the output voltage control table 51 will be described later. Furthermore, the second memory 18 also records audio data (information) 52 for transmission to the FM audio apparatus 2 for output.

  The device power source 19 is for supplying power to the communication terminal 1, and is a storage battery (battery) that can be charged through the charger connector 20. The apparatus power source 19 can be realized by, for example, a lithium ion battery, a nickel cadmium battery, or a nickel metal hydride battery.

  The charger connector 20 is a contact member for connecting the charger 42 via the charger cable 43, and makes electrical connection between the charger cable 43 and the board inside the communication terminal 1. The charger connector 20 is configured to detect the insertion of the charger cable 43 and notify the main controller 21 of the insertion.

  The main control unit 21 performs various controls of each unit of the communication terminal 1 and can be realized by, for example, a CPU, a microcontroller, or the like.

  Thus, the communication terminal 1 provided with each part can implement | achieve a telephone call function, an audio | voice data transfer function, etc. which are shown below.

  First, the communication terminal 1 transmits / receives a signal to / from a base station (not shown) via the communication antenna 8 under transmission / reception control by the communication control unit 9. Then, the signal processing unit 10 performs predetermined signal processing on the signal transmitted and received by the communication control unit 9. As a result, the sound transmitted from the other communication terminal via the base station is output from the speaker 12, or the sound input from the microphone 13 is transmitted to the other communication terminal via the base station. It has become. In this way, communication terminal 1 according to the present embodiment realizes a call function with other communication terminals.

  In the communication terminal 1, the audio data 52 stored in the second memory 18 is read out and output to the signal processing unit 10 in accordance with a control instruction from the main control unit 21. The read audio data 52 is output to the signal processing unit 10 as a TS (Transport Stream) defined by the MPEG-2 system. The signal processing unit 10 reproduces each signal multiplexed as a TS as an output signal group and transmits it to the FM transmitter 4.

  When the FM transmitter 4 receives an audio signal that is an output signal group of the audio data 52 from the signal processing unit 10, the FM transmitter 4 controls the FMTX antenna 3 and transmits the audio signal to the FM audio apparatus 2. When receiving the audio signal from the communication terminal 1, the FM audio apparatus 2 outputs the audio signal based on the received audio signal. In this way, the communication terminal 1 according to the present embodiment realizes an audio data transfer function for the FM audio apparatus 2.

  In addition, the function which the communication terminal 1 which concerns on this Embodiment has is not limited to the above-mentioned call function and an audio | voice data transfer function. For example, it is configured to include an imaging unit and other functions such as a camera function for taking an image with the imaging unit, an email function for sending and receiving text data, image data, or HTML data, such as an e-mail or a web page. Also good.

  Furthermore, when the FMTX antenna 3 can also be used for digital television reception, digital broadcast data is received via the FMTX antenna 3. Then, video data of the received broadcast data may be displayed on the display unit 15 and audio data may be output from the speaker 12 to realize a digital broadcast reproduction function.

  By the way, in the communication terminal 1 according to the present embodiment as described above, when the audio data transfer function is executed in a state where the earphone cable 41 or the charger cable 43 is connected to the communication terminal 1, the FM audio device The problem is that the electric field intensity of the radio wave transmitted to 2 increases and exceeds the range defined by the Radio Law.

  Therefore, the communication terminal 1 according to the present embodiment monitors the electric field strength of the radio wave transmitted to the FM audio device 2, and if it exceeds the range defined by the Radio Law, the radio terminal output from the FM transmitter 4 It is comprised so that electric field strength may be suppressed.

(Field strength control processing)
In the following, referring to FIG. 1, FIG. 4, and FIG. 5, in the communication terminal 1 according to the present embodiment, a process for controlling the electric field intensity of the radio wave output from the FM transmitter 4 (electric field intensity control process) Details will be described.

(Software configuration of communication terminal for electric field strength control processing)
First, the software configuration of the communication terminal 1 related to the electric field strength control process will be described with reference to FIG. FIG. 1 shows an embodiment of the present invention and is a block diagram showing a software configuration of a communication terminal 1 related to electric field strength control processing.

  As shown in FIG. 1, the communication terminal 1 according to the present embodiment includes, as functional blocks, a cable sensing unit (detection unit) 31, a measurement instruction unit (instruction unit) 32, an applied voltage calculation unit (determination unit) 33, And a transmitter control instruction unit (control means) 34. Each functional block can be realized when the main control unit 21 is realized by a CPU, for example, by the CPU reading and executing a program stored in the second memory or the like to the first memory or the like.

  The cable sensing unit 31 determines whether the earphone cable 41 or the charger cable 43 is connected to the communication terminal 1. As described above, each of the charger connector 20 and the earphone connector 14 is configured to detect when a cable is inserted. Then, the charger connector 20 and the earphone connector 14 notify the cable detection unit 31 of the detection result. In this way, the cable sensing unit 31 can grasp whether or not the earphone cable 41 or the charger cable is inserted and connected to the communication terminal 1.

  Furthermore, when the device power supply 19 is charged by the charger 42 via the charger connector 20, that is, when power is supplied from the charger 42, the cable sensing unit 31 can detect the supply of this power. It is configured. Since it is comprised in this way, the cable sensing part 31 can grasp | ascertain the connection state of the cable 43 for chargers more accurately.

  Further, the cable sensing unit 31 relates to whether or not the earphone cable 41 or the charger cable 43 is connected to the communication terminal 1 in accordance with an instruction from the measurement instruction unit 32 described later, that is, the connection state of the cable. It is configured to notify information.

  The measurement instruction unit 32 controls the measurement unit 6 to measure the electric field strength of the radio wave output from the FM transmitter 4. As described above, the measurement instructing unit 32 is configured to obtain a notification from the cable sensing unit 31 regarding whether or not the charger cable 43 or the earphone cable 41 is connected. That is, the measurement instruction unit 32 is configured to be able to acquire information related to the connection state of the cable in the communication terminal 1 from the cable sensing unit 31.

  For this reason, the measurement instruction | indication part 32 can grasp | ascertain whether it is the state to which the cable 43 for chargers or the earphone cable 41 is connected.

  The measurement instruction unit 32 is also configured to receive information indicating whether or not the audio data 52 is output from the FM transmitter 4 to the FM audio apparatus 2 from the transmitter control instruction unit 34 described later. Therefore, the measurement instruction unit 32 can grasp whether or not the audio data 52 is output from the FM transmitter 4 to the FM audio apparatus 2, that is, whether or not the FM transmitter 4 is operating.

  Therefore, when the FM transmitter 4 is in operation and the earphone cable 41 or the charger cable 43 is connected, the measurement instruction unit 32 performs measurement so as to measure the electric field strength of the radio wave output from the FM transmitter 4. The unit 6 is controlled. In response to the control instruction from the measurement instruction unit 32, the measurement unit 6 measures the voltage induced by the radio wave received by the detection antenna 5. Then, the measurement result is notified to the applied voltage calculation unit 33.

  The applied voltage calculation unit 33 calculates the electric field strength of the radio wave received by the detection antenna 5 based on the measurement result received from the measurement unit 6. Then, with reference to the output voltage control table 51, it is determined whether or not the calculated result is larger than a predetermined radio wave intensity. Based on the determination result, the applied voltage calculation unit 33 instructs the transmitter control instruction unit 34 to control the intensity of the radio wave output from the FM transmitter 4.

  More specifically, as shown in FIG. 4, the voltage value to be applied to the FM transmitter 4 is determined as the output voltage control table 51 according to the difference between the measured electric field strength of the radio wave and the predetermined electric field strength. Yes. FIG. 4 is a diagram illustrating an example of the output voltage control table 51 held by the communication terminal 1 according to the present embodiment.

  Here, when the electric field strength of the radio wave received by the detection antenna is larger than the predetermined electric field strength by α (μV / m), the applied voltage calculation unit 33 refers to the output voltage control table 51 and the FM transmitter 4. The voltage applied to is determined to be lowered by β (μV). Conversely, when the electric field strength of the radio wave is smaller than the predetermined electric field strength by α (μV / m), the applied voltage calculation unit 33 refers to the output voltage control table 51 and determines the voltage to be applied to the FM transmitter 4 by β Decide to increase by (μV).

  When the voltage to be increased or decreased is determined in this way, the applied voltage calculation unit 33 instructs the transmitter control instruction unit 34 to control to apply the FM transmitter 4 with the determined voltage.

  The predetermined electric field strength is set in advance as a value that allows the transmitted audio data 52 to be reproduced with high sound quality by the FM audio apparatus 2 within a range permitted by the Radio Law. For example, the predetermined electric field strength may be a maximum electric field strength value within a range permitted by the Radio Law.

  The transmitter control instruction unit 34 controls the operating state of the FM transmitter 4 in accordance with an instruction from the applied voltage calculation unit 33. More specifically, the strength of the radio wave output from the FM transmitter 4, that is, the electric field strength is adjusted by controlling the voltage applied to the FM transmitter 4 in accordance with an instruction from the applied voltage calculation unit 33.

(Processing flow of electric field strength control processing)
Next, with reference to FIG. 5, the “process flow of electric field strength control process” in communication terminal 1 according to the present embodiment will be described. FIG. 5 illustrates an embodiment of the present invention, and is a flowchart illustrating an example of “a process flow of an electric field strength control process” in the communication terminal 1.

  First, in the communication terminal 1, the measurement instruction unit 32 determines whether the FM transmitter 4 is operating based on the notification from the transmitter control instruction unit 34 (step S1, hereinafter referred to as S1). Here, when the FM transmitter 4 is not operating (“NO” in S1), the process ends because there is no need to execute the electric field intensity control processing of the radio wave output from the FM transmitter 4.

  On the other hand, if “YES” in step S <b> 1, the measurement instruction unit 32 confirms whether the cable is stuck in the communication terminal 1 based on the notification from the cable sensing unit 31. That is, the measurement instruction unit 32 confirms whether the earphone cable 41 or the charger cable 43 is connected to the communication terminal 1 (S2).

  Here, when the measurement instruction unit 32 determines that the cable is not pierced in the communication terminal 1 (“NO” in S2), it is not necessary to execute the electric field intensity control process for the radio wave output from the FM transmitter 4. finish. That is, even when the audio data 52 is modulated to the FM frequency from the FM transmitter 4 and transmitted to the FM audio apparatus 2 as a radio wave, it is necessary to execute the electric field strength control process when the cable is not connected. There is no.

  On the other hand, if “YES” in the step S2, the measurement instructing unit 32 instructs the measuring unit 6 to measure the electric field strength of the radio wave output from the FM transmitter 4. In response to this instruction, the measurement unit 6 measures the electric field strength (input electric field strength) of the radio wave received by the detection antenna 5 (S3). Then, the measurement unit 6 outputs the measurement result to the applied voltage calculation unit 33.

  The applied voltage calculation unit 33 determines the voltage (output voltage) to be applied to the FM transmitter 4 with reference to the output voltage control table 51 based on the measurement result received from the measurement unit 6 (S4). For example, when the measurement result by the measurement unit 6 is larger than the predetermined electric field strength by α (μV / m), the applied voltage calculation unit 33 determines to decrease the voltage applied to the FM transmitter 4 by β (μV). Conversely, when the measurement result by the measurement unit 6 is smaller than the predetermined electric field strength by α (μV / m), the applied voltage calculation unit 33 determines to increase the voltage applied to the FM transmitter 4 by β (μV). .

  When the applied voltage calculation unit 33 determines the voltage (output voltage) to be applied to the FM transmitter 4, the applied voltage calculation unit 33 instructs the transmitter control instruction unit 34 to control the voltage to be applied to the FM transmitter 4. In response to the instruction from the applied voltage calculation unit 33, the transmitter control instruction unit 34 controls to apply the voltage determined by the applied voltage calculation unit 33 to the FM transmitter 4 (S5).

  The transmitter control instruction unit 34 controls the voltage applied to the FM transmitter 4 and monitors the operating state of the FM transmitter 4. Information indicating that the transmitter 4 is in operation is transmitted to the measurement instruction unit 32 until an instruction to stop the FM transmitter 4 is input from the operation unit 16 (until “YES” in step S6). Upon receiving this information, the measurement instruction unit 32 acquires information related to the cable connection state in the communication terminal 1 from the cable sensing unit 31, and executes the above-described processing from step S2 to step S6 again.

  As described above, in communication terminal 1 according to the present embodiment, when it is necessary to execute “field strength control processing”, that is, when cable is connected in communication terminal 1 and FM transmitter 4 is in operation. The output of the radio wave can be controlled so that the electric field intensity of the radio wave output from the FM transmitter 4 is within the range permitted by the Radio Law.

  In this way, the communication terminal 1 can quickly measure the strength of the output radio wave by the measurement unit 6 included in the own device, and the measurement result can be fed back to the transmitter control instruction unit 34 through the applied voltage calculation unit 33. is there.

  For this reason, the communication terminal 1 is connected to the cable, and the electric field strength of the output radio wave is large, and even if the electric field strength exceeds the range of electric field strength that does not require a license defined by the Radio Law, In addition, since it is not necessary to send a control signal from the receiving device to the transmitting device, the electric field strength of the radio wave can be quickly controlled.

  Further, in the control method of the communication terminal 1 according to the present embodiment, the transmitter control instruction unit 34 can appropriately control the electric field strength of the output radio wave based on the result measured by the measurement unit 6, In particular, since a complicated circuit configuration is not required, the cost for manufacturing the device can be suppressed.

  For example, when a cable is connected to the communication terminal 1, the electric field strength of the output radio wave varies depending on the length of the cable. In view of this, it is conceivable that the electric field strength of the radio wave to be output is changed in consideration of the length of the connected cable.

  However, in the communication terminal 1 according to the present embodiment, the applied voltage calculation unit 33 determines the voltage to be applied to the FM transmitter 4 from the measurement result measured by the measurement unit 6 as described above. The transmitter control instruction unit 34 applies the FM transmitter 4 with the voltage determined by the applied voltage calculation unit 33 and can appropriately control the magnitude of the electric field strength of the output radio wave. In other words, the communication terminal 1 is configured to control the magnitude of the electric field strength based on the output result of the radio wave output from the FM transmitter 4.

  For this reason, the communication terminal 1 does not need to have a complicated configuration in which the magnitude of the electric field strength is appropriately changed in consideration of, for example, the difference in the length of the cable to be connected, and the manufacturing cost can be suppressed.

  The communication terminal 1 according to the present embodiment outputs the radio wave when the electric field intensity of the radio wave output from the FM transmitter 4 exceeds the range of the electric field intensity that does not require a license defined by the Radio Law. In addition to controlling to be small, it is also possible to control so that the output of the radio wave is large when the electric field intensity is smaller than a predetermined electric field strength.

  For this reason, in the communication terminal 1 according to the present embodiment, the electric field strength of the radio wave output from the FM transmitter 4 is adjusted so that the electric field strength is appropriate within the range of the electric field strength permitted by the Radio Law. be able to.

  Further, the communication terminal 1 according to the present embodiment is configured to execute the electric field strength control process only when a cable is connected and the FM transmitter 4 is in operation. For this reason, since it is not necessary to always operate the measurement part 6, the power consumption in the communication terminal 1 can be reduced.

  The communication terminal 1 is configured to measure the electric field strength of the radio wave output from the FM transmitter 4 and to control the magnitude of the electric field strength of the radio wave output based on the measurement result for this output. For this reason, for example, in consideration of a case where the electric field strength of the radio wave output from the communication terminal 1 according to the present embodiment is increased by connecting a cable or the like, the electric field strength of the radio wave output from the initial state is set to be weak. There is no need to keep it. For this reason, since the electric field strength of the output radio wave is weak, it is possible to prevent a problem that the audio data 52 cannot be reproduced with high quality by the FM audio apparatus 2.

  In addition, although the earphone cable 41 and the charger cable 43 have been described above as the connectable cables in the communication terminal 1 according to the present embodiment, the present invention is not limited to these. In the case where the communication terminal 1 includes a USB connector, a USB cable can be cited as a cable that can be connected to the communication terminal 1. That is, in the communication terminal 1 according to the present embodiment, any cable that can be used as an accessory can be assumed.

  In the above description, the communication terminal 1 that can be realized by, for example, a mobile phone or a PDA has been described as an example. However, the communication terminal 1 is not limited thereto. For example, it may be a music playback device equipped with an FM transmitter. An example of the music playback device is a device that can play back audio data compressed by MP3 or the like.

  In communication terminal 1 according to the present embodiment, application voltage calculation unit 33 determines the voltage to be applied to FM transmitter 4 with reference to output voltage control table 51, and FM transmitter 4 is determined using the determined voltage. It was the structure which the transmitter control instruction | indication part 34 controls to apply.

  However, instead of referring to the output voltage control table 51 in this way, when the measurement result by the measurement unit 6 exceeds the range of electric field strength that does not require a license defined by the Radio Law, it is always reduced by a predetermined voltage. Then, it may be configured to be applied to the FM transmitter 4. When configured in this manner, the communication terminal 1 does not particularly require the output control table 51 and the applied voltage calculation unit 33, and the design of the communication terminal 1 can be simplified. In addition, since the configuration is such that the voltage is always reduced and applied by a predetermined voltage, the radio wave output of the FM transmitter 4 can be easily controlled.

  Further, in communication terminal 1 according to the present embodiment, FM transmitter is referred according to whether or not the electric field strength of the radio wave output from FM transmitter 4 is greater than a predetermined electric field strength with reference to output voltage control table 51. 4 determines the voltage to be applied. And it was the structure which controls the electric field strength of the electromagnetic wave output from this FM transmitter 4 by applying FM transmitter 4 with the determined voltage.

  Further, the communication terminal 1 is configured as follows, and the configuration is such that the voltage applied to the FM transmitter 4 is determined when the FM transmitter 4 is instructed according to the position where the communication terminal 1 exists. Also good. That is, as shown in FIG. 6, the communication terminal 1 further includes a position measurement unit 22 in the configuration of the communication terminal 1 shown in FIG. 1, and the second memory 18 further stores the influence degree information 53. To do. FIG. 6 is a diagram showing another embodiment of the present invention, and is a block diagram showing a software configuration of a communication terminal regarding electric field strength control processing.

  The position measuring unit 22 is for measuring information indicating the position where the communication terminal 1 is present, and for example, uses a radio wave from a GPS satellite to determine latitude, longitude, altitude, and the like.

  The influence degree information 53 is information indicating the position that affects the electric field strength of the radio wave output from the FM transmitter 4 and the degree of the influence. The position that affects the electric field strength of the radio wave is, for example, when the radio wave is output from the FM transmitter 4 at that position, and the electric field strength is larger than when the radio wave is output at an ideal location. It is a position that becomes or becomes smaller. The degree of influence is information indicating how much the electric field intensity of the output radio wave is increased or decreased as compared with the magnitude of the electric field intensity of the radio wave output at an ideal place.

  More specifically, the influence degree information 53 is the increase / decrease of the electric field strength based on the position information (longitude, latitude, and altitude) and the magnitude of the electric field strength of the radio wave output at an ideal location. It is a table which shows the correspondence with the information which showed.

  In the mobile terminal 1 configured as described above, when receiving an instruction from the operation unit 16 to transmit the audio data 52 to the FM audio device 2, the transmitter control instruction unit 34 instructs the position measurement unit 22. The information regarding the position where the communication terminal 1 exists is acquired. Based on the acquired information regarding the position, the transmitter control instruction unit 34 determines the electric field strength of the radio wave output from the FM transmitter 4 with reference to the influence degree information 53 stored in the second memory 18.

  For example, in the position where the communication terminal 1 is present, when the electric field strength of the output radio wave increases, the transmitter control instruction unit 34 reduces the voltage applied to the FM transmitter 4 below the voltage applied at an ideal location. To control.

  On the other hand, in the position where the communication terminal 1 exists, when the electric field strength of the output radio wave decreases, the transmitter control instruction unit 34 increases the voltage applied to the FM transmitter 4 more than the voltage applied at an ideal location. To control.

  As described above, in the communication terminal 1 further including the position measuring unit 22 and configured to further store the influence degree information 53, when the radio wave is output from the FM transmitter 4, the communication terminal 1 is located at the position where the communication terminal 1 exists. Accordingly, the voltage applied to the FM transmitter 4 can be adjusted in advance. Therefore, the communication terminal 1 can output a radio wave of electric field strength that does not require a license defined by the Radio Law when the FM transmitter 4 is in operation.

  In addition, this invention is not limited to embodiment mentioned above, A various change is possible in the range shown to the claim. That is, embodiments obtained by combining technical means appropriately changed within the scope of the claims are also included in the technical scope of the present invention.

  Finally, each block included in the communication terminal 1, in particular, the cable sensing unit 31, the measurement instruction unit 32, the applied voltage calculation unit 33, and the transmitter control instruction unit 34 included in the main control unit 21 is configured by hardware logic. Alternatively, it may be realized by software using a CPU as follows.

  That is, the communication terminal 1 includes a CPU (central processing unit) that executes instructions of a control program that realizes each function, a ROM (read only memory) that stores the program, a RAM (random access memory) that expands the program, A storage device (recording medium) such as a memory for storing the program and various data is provided. An object of the present invention is to provide a recording medium in which a program code (execution format program, intermediate code program, source program) of a control program of the communication terminal 1 which is software that realizes the above-described functions is recorded in a computer-readable manner This can also be achieved by supplying the communication terminal 1 and reading and executing the program code recorded on the recording medium by the computer (or CPU or MPU).

  Examples of the recording medium include tapes such as magnetic tapes and cassette tapes, magnetic disks such as floppy (registered trademark) disks / hard disks, and disks including optical disks such as CD-ROM / MO / MD / DVD / CD-R. Card system such as IC card, IC card (including memory card) / optical card, or semiconductor memory system such as mask ROM / EPROM / EEPROM / flash ROM.

  The communication terminal 1 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network. The communication network is not particularly limited. For example, the Internet, intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available. Also, the transmission medium constituting the communication network is not particularly limited. For example, even in the case of wired such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL line, etc., infrared rays such as IrDA and remote control, Bluetooth ( (Registered trademark), 802.11 wireless, HDR, mobile phone network, satellite line, terrestrial digital network, and the like can also be used. The present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.

  The transmission device according to the present invention can determine the strength of the output radio wave according to the measurement result of the strength of the radio wave output from the output unit, and control the strength of the radio wave output from the output unit. It is a possible configuration. Therefore, the present invention can be widely applied to all devices having a function of transmitting information by a weak radio wave defined in the Radio Law.

FIG. 4 is a block diagram illustrating a software configuration of a communication terminal according to an embodiment of the present invention and related to electric field strength control processing. FIG. 1, showing an embodiment of the present invention, is a diagram showing a schematic configuration of a reproduction system. It is a block diagram which shows the hardware constitutions of the communication terminal which concerns on this Embodiment. It is a figure which shows an example of the output voltage control table which the communication terminal which concerns on this Embodiment hold | maintains. FIG. 9, showing the embodiment of the present invention, is a flowchart illustrating an example of a “process flow of electric field strength control processing” in a communication terminal. It is a figure which shows another embodiment of this invention, and is a block diagram which shows the software structure of the communication terminal regarding an electric field strength control process. It is a figure which shows a prior art and shows the allowable value of the electric field strength in the distance of 3 meters of a weak radio station.

Explanation of symbols

1 Communication terminal (transmitting device)
2 FM audio device (other devices)
3 FMTX antenna (output unit)
4 FM transmitter (output unit)
5 Detection antenna (measurement unit)
6 Measurement Unit 14 Earphone Connector 16 Operation Unit 18 Second Memory (Voltage Control Table Storage Device, Field Strength Effect Information Storage Device)
19 Device power supply 20 Connector for charger 22 Position measurement part (position information acquisition part)
31 Cable detector (detection means)
32 Measurement instruction section (instruction means)
33 Applied voltage calculation unit (decision means)
34 Transmitter control instruction section (control means)
41 Earphone cable (cable)
43 Cable for charger (cable)
51 Output voltage control table (voltage control table)
52 Voice data (information)
53 Impact information

Claims (9)

A transmission device that transmits information to other devices by radio waves of electric field strength that does not require a license defined by the Radio Law,
An output unit for outputting the radio wave;
A measurement unit for measuring the electric field strength of the radio wave output by the output unit;
And a control unit that controls the magnitude of the electric field strength of the radio wave output from the output unit according to the measurement result of the measurement unit. The control means controls the magnitude of the electric field strength of the radio wave output from the output unit by controlling the voltage applied to the output unit,
According to the measurement result of the measurement unit, further comprising a determination means for determining a voltage to be applied to the output unit,
2. The transmission according to claim 1, wherein the control unit applies the output unit at a voltage determined by the determination unit, and controls the magnitude of the electric field intensity of the radio wave output from the output unit. apparatus.   When the electric field strength of the radio wave measured by the measurement unit exceeds the range of electric field strength that does not require a license stipulated by the Radio Law, the determining means sets the voltage applied to the output unit to a predetermined magnitude. The transmission apparatus according to claim 2, wherein the transmission apparatus determines to reduce the transmission apparatus. A voltage control table storage device for storing a voltage control table indicating a correspondence relationship between information indicating the electric field intensity of the radio wave measured by the measurement unit and a voltage applied to the output unit;
The transmission device according to claim 2, wherein the determination unit determines a voltage according to a measurement result of the measurement unit as a voltage to be applied to the output unit with reference to the voltage control table. A connection for connecting to the cable;
Detecting means for detecting whether or not the cable is connected to the transmitting device at the connection unit;
When the detection unit detects that the cable is connected to the transmission device when a radio wave is output from the output unit, the electric field strength of the radio wave output by the output unit is measured. The transmission apparatus according to claim 1, further comprising instruction means for instructing the measurement unit. A position information acquisition unit that acquires position information indicating a position where the transmission device exists;
Electric field strength influence information storage for storing electric field strength influence information in which the position information is associated with the degree of influence information indicating the degree of influence on the magnitude of the electric field strength of the radio wave output at the position indicated by the position information. And further comprising a device,
When transmitting information to another device, the control means refers to the electric field strength effect information based on the position information acquired by the position information acquisition unit, and controls the voltage applied to the output unit. The transmission device according to claim 1, wherein It is equipped with an output unit that outputs radio waves of electric field strength that does not require a license stipulated by the Radio Law, and a measurement unit that measures the electric field strength of radio waves output by this output unit. A method of controlling a transmitting device that transmits to
By controlling the voltage applied to the output unit, the magnitude of the electric field strength of the radio wave output from the output unit is controlled, and the measurement unit is configured to measure the electric field strength of the radio wave output from the output unit. A first step instructing
A second step of determining a voltage to be applied to the output unit according to a measurement result by the measurement unit;
And a third step of controlling the magnitude of the electric field strength of the output radio wave by applying the output unit at the voltage determined in the second step.   A control program for operating the transmission apparatus according to claim 1, wherein the control program for the image forming apparatus causes a computer to function as each of the above-described units.   A computer-readable recording medium on which the control program for the transmission apparatus according to claim 8 is recorded.

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