JP4725491B2 - External speaker system - Google Patents

Description

  The present invention relates to an external speaker utilization system, and more particularly, to an external speaker utilization system capable of outputting voice / music reproduced by a portable terminal device using a speaker of an external device outside the portable terminal device. .

  Portable devices having a music playback function have become widespread. Usually, portable music playback devices are supposed to listen to music using headphones or the like, and often do not include a speaker. In addition, in a mobile phone with a music playback function (including PHS), music can be played back using the built-in speaker, but the speaker of the mobile phone is small and there is a limit to obtaining high sound quality. . Therefore, in order to listen to music with high sound quality without using headphones or the like with a portable music player, it is necessary to reproduce music using an external speaker.

  As a method of playing music using an external speaker, a portable music player is connected to a transmission means such as an FM transmitter, and this is received by an FM radio receiver, etc., and the music is played using the FM radio receiver speaker. There is a way to play. When the FM transmitter is used, if the FM transmitter is built in the portable music player, the mounting area increases due to the addition of the circuit block. The portable music player is required to be downsized, and usually the FM transmitter is externally attached to the portable music player.

There is a technique described in Patent Document 1 for music reproduction of a mobile phone using an FM transmitter. In Patent Document 1, a transmission / power supply device including an FM transmitter and a charging unit is used, and a mobile phone is connected to the transmission / power supply device. The transmission / power supply device converts a music signal input from a headphone terminal of the mobile phone into an FM signal by an FM transmitter while charging the mobile phone, and outputs the FM signal. This FM signal is received and reproduced by an in-vehicle FM radio or the like.
Utility Model Registration No. 3111606

  In Patent Document 1, music can be heard from an external speaker connected to an FM radio receiver while charging a portable music player using a transmission / power supply device. However, in order to listen to music from an external speaker using this transmission / power supply device, it is necessary to connect a power line from an external power source such as an AC adapter or a DC adapter to the transmission / power supply device. There is a problem that the convenience is bad. Further, when the external power source cannot be secured, there is a problem that the FM transmitter cannot be operated and music cannot be heard from the external speaker.

  The present invention provides an external speaker utilization system that solves the above-mentioned problems of the prior art, improves convenience, and can listen to voice / music using a speaker of an external device even in a situation where an external power source cannot be secured. To do.

To achieve the above object, an external speaker system for utilizing the invention, power is supplied from an external power source, supply a first charging terminal for charging the battery of the portable terminal device, to the first charging terminal operate using power supplies, said a wireless transmission unit for wirelessly output to an external device the input speech / music signal is connected to the external speaker from the portable terminal device includes a charger holder without a battery when a battery, and an output terminal for outputting an audio / music signal, the battery when the first to detect the voltage of the charging terminal, is powered from the external power source to the first charging terminal charging to select the path, wherein when an external power source is not power supplied to the first charging terminal, the first charging terminals, operations allowed the radio transmission section performs power supply from the battery , A mobile terminal device and a selector switch for selecting a path to and having a.

  In the external speaker utilization system of the present invention, the charger holder used when charging the portable terminal device has a wireless transmission unit, and wirelessly transmits voice / music signals input from the portable terminal device to the external device. To do. By outputting audio / music signals from the speakers of the external device or from the speakers connected to the external device, the audio / music signals reproduced on the mobile terminal device can be heard on the speakers outside the mobile terminal device. . When the portable terminal device detects that power for charging is not supplied to the charging terminal of the charger holder, the portable terminal device switches the switch, supplies voltage to the charging terminal of the charger holder from the battery side of the portable terminal device, and wirelessly Supply power to the transmitter. In this way, even in a situation where an external power source for charging the mobile terminal device cannot be secured, it is possible to listen to voice / music reproduced on the mobile terminal device using a speaker outside the mobile terminal device. In this case, since the cable for supplying the power from the external power source is not connected to the charger holder, the periphery of the wiring can be cleared.

  In the external speaker utilization system of the present invention, a configuration in which the wireless transmission unit is configured as an FM transmitter that performs FM modulation and outputs an FM wave can be employed. In this case, audio / music played back on the mobile terminal device can be heard using an audio device having a function of receiving FM radio as an external device.

  In the external speaker utilization system of the present invention, it is possible to adopt a configuration further including an output level adjustment unit for controlling the output level of the FM wave. In this case, the volume reproduced from the external speaker can be adjusted to a desired volume by adjusting the output level of the FM wave by the output level adjustment unit.

  In the external speaker utilization system of the present invention, a configuration in which the wireless transmission unit is configured as a Bluetooth communication unit that performs Bluetooth communication with the external device can be employed. Such a communication means can also be adopted as a wireless communication means.

  In the external speaker utilization system of the present invention, the portable terminal device has a music playback function, and a configuration in which a music signal reproduced by the music playback function is output from the output terminal can be employed. In this case, by using an external device capable of reproducing high-quality music, music reproduced on the mobile terminal device can be enjoyed with high quality.

  In the external speaker utilization system of the present invention, a configuration in which the mobile terminal device is configured as a mobile phone can be adopted. In mobile phones, functions are becoming increasingly multifunctional, and it is not uncommon for music playback functions to be installed, but the speakers of mobile phones are often poor for music playback. In the present invention, for example, by transmitting music played on a mobile phone from the wireless transmission unit of the charger holder to the external device, the user can listen to the music using a speaker of a higher quality external device.

  In the external speaker utilization system of the present invention, a configuration for outputting the other party's voice in a mobile phone call from the output terminal can be adopted. In a mobile phone, the other party's voice in a mobile phone call is output from the receiver built into the mobile phone, but the receiver is small and not suitable for outputting a large volume, so it may be difficult for people who are far away to hear Many. When the other party's voice is transmitted to the external device using the wireless transmitter and the other party's voice is output from the speaker of the external device, the other party's voice can be played at a high volume, It is easy to hear the voice.

  In the external speaker utilization system of the present invention, the charger holder used when charging the portable terminal device has a wireless transmission unit, and wirelessly transmits voice / music signals input from the portable terminal device to the external device. To do. When the portable terminal device detects that power for charging is not supplied to the charging terminal of the charger holder, the portable terminal device switches the switch, supplies voltage to the charging terminal of the charger holder from the battery side of the portable terminal device, and wirelessly Supply power to the transmitter. In this way, even in a situation where an external power source for charging the mobile terminal device cannot be secured, it is possible to listen to voice / music reproduced on the mobile terminal device using a speaker outside the mobile terminal device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the configuration of an external speaker utilization system (music playback system) according to an embodiment of the present invention. The music playback system 100 includes a mobile phone 11 and a charger holder 13. The mobile phone 11 has a music playback function. The mobile phone 11 also has an earphone jack 12 for audio external output. The FM radio receiver 50 receives and reproduces the FM radio and outputs a reproduction signal from the speaker 51. The speaker 51 may be a speaker externally attached to the FM radio receiver 50, or may be a speaker built in the FM radio receiver 50.

  The charger holder 13 includes an FM transmitter 14, an FM output level controller 15, an earphone jack cable 16, and a power connection I / O not shown in FIG. The charger holder 13 holds the mobile phone 11. Earphone jack cable 16 is connected to earphone jack 12 of mobile phone 11. The FM transmitter 14 outputs a music signal input from the earphone jack cable 16 as an FM wave having a predetermined frequency by FM modulation. The FM output level controller 15 controls the power level of the radio wave output from the FM transmitter 14.

  FIG. 2 shows the appearance of the back side of the charger holder 13. The DC adapter cable 17 or the AC adapter cable 18 is connected to the power connection I / O 19 via the power connection connector 20. The DC adapter cable 17 is a cable for connecting the in-vehicle cigar socket and the charger holder 13. The AC adapter cable 18 is a cable for connecting the AC power source and the charger holder 13. The DC adapter cable 17 and the AC adapter cable 18 supply a voltage suitable for charging the mobile phone 11 to the charger holder 13. The charger holder 13 charges the mobile phone 11 using the power supplied by the DC adapter cable 17 or the AC adapter cable 18.

  FIG. 3 shows a specific example of an FM radio receiver. In this example, a car-mounted FM radio built-in car stereo 55 is used as the FM radio receiver 50 (FIG. 1). In this case, the vehicle-mounted speaker (not shown) becomes the speaker 51 (external speaker) in FIG. FIG. 4 shows another specific example of the FM radio receiver. In this example, the FM radio built-in stereo component 56 is used as the FM radio receiver 50 (FIG. 1). In this case, the speaker of the stereo component 56 becomes the external speaker 51. The FM radio receiver 50 is typically configured as these stereo systems.

  FIG. 5 shows the internal configuration of the charger holder 13. The basic part for charging the mobile phone 11 (FIG. 1) includes a power connection I / O 19, a charging terminal (+) 29, and a charging terminal (−) 28. The FM transmitter 14 includes an FM transmitter power supply unit 24, an FM modulation unit 25, a variable amplifier 26, and an FM antenna 27. The FM transmitter power supply unit 24 is connected to the power connection I / O 19 and the charging terminal 29 and functions as a power supply unit of the FM transmitter.

  The FM modulation unit 25 FM modulates the music signal input from the mobile phone 11 via the earphone jack cable 16. The variable amplifier 26 amplifies and outputs the music signal that has been FM modulated by the FM modulator 25. The gain of the variable amplifier 26 is controlled by the FM output level controller 15. The FM antenna 27 is an antenna built in the charger holder 13 and outputs the music signal amplified by the variable amplifier 26 as an FM wave.

  FIG. 6 shows the internal configuration of the mobile phone. The mobile phone 11 is roughly divided into a basic component part, a music playback function part, and a part related to charging. As a basic configuration, the cellular phone 11 includes a CPU 31 that performs arithmetic processing, a memory 32 that stores information, a key matrix input unit 33 that performs key input, an LCD display unit 34 that performs operation display, a microphone 39 that inputs voice during a call, Receiver 38 that outputs the other party's voice, baseband unit 30 that generates a baseband signal based on voice information, a radio unit 45 that generates an RF signal based on the baseband signal, and an antenna that outputs the RF signal as a radio wave 46.

  The cellular phone 11 has a music playback function, a music data memory unit 35 that stores music data, a music data decoder unit 36 that decodes music data as an analog signal, a speaker 40 that outputs sound, and amplifies the music signal. An amplifier 37 is provided. Earphone jack 12 is connected to amplifier 37. In addition, the mobile phone 11 includes a charging terminal (−) 43, a charging terminal (+) 44, a charging circuit 41, and a changeover switch 23 as a block relating to charging. The charging terminals 43 and 44 are in contact with the charging terminals 28 and 29 of the charger holder 13, respectively. The charging circuit 41 controls the charging current for the battery 42. The changeover switch 23 detects the voltage at the charging terminal 44 and switches between charging the battery 42 and supplying power from the battery 42 to the charging terminal 44.

  A procedure for listening to music from an external speaker using the music playback system 100 will be described. FIG. 7 shows a procedure when an AC adapter is used. Here, the FM radio built-in stereo component 56 (FIG. 4) is used as the FM radio receiver 50. The mobile phone 11 is set in the charger holder 13 (step A1). In order to charge from the AC adapter (AC outlet), the AC adapter cable 18 is connected to the power connection I / O 19 of the charger holder 13 (step A2), and the AC adapter cable 18 is connected to the AC outlet (step). A3). As a result, power is supplied to the charging terminal 29 of the charger holder 13 and the FM transmitter power supply unit 24 (FIG. 5) via the power connection I / O 19.

  A charging voltage is supplied to the charging terminal 44 of the mobile phone 11 via the AC adapter cable 18 and the charger holder 13. The changeover switch 23 detects that the voltage is supplied to the charging terminal 44 and selects the charging circuit 41 side. Thereby, charge to the battery 42 is started (step A4). The earphone jack cable 16 of the charger holder 13 is connected to the earphone jack 12 of the mobile phone 11 (step A5). Thereafter, the cellular phone 11 is operated to activate the music reproduction function, and music reproduction is started (step A6).

  The music signal output from the earphone jack 12 is input to the FM modulation unit 25 in the FM transmitter 14 via the earphone jack cable 16, is FM-modulated and then amplified by the variable amplifier 26, and FM waves from the FM antenna 27. (Step A7). The FM radio built-in stereo component 56 is operated, the frequency is adjusted to the output frequency of the FM transmitter 14, and music is output from the speaker (step A8). When the reception level on the FM radio side is insufficient, the FM output level controller 15 is adjusted to set the FM wave intensity to an appropriate level (step A9).

  Next, a procedure when using the DC adapter will be described. FIG. 8 shows the procedure. Here, an FM radio built-in car stereo 55 is used as the FM radio receiver 50. The mobile phone 11 is set in the charger holder 13 (step B1). In order to charge from the in-vehicle DC socket, the DC adapter cable 17 is connected to the power connection I / O 19 of the charger holder 13 (step B2), and the DC adapter cable 17 is connected to the in-vehicle DC socket (step B3). . Thus, power is supplied to the charging terminal 29 of the charger holder 13 and the FM transmitter power supply unit 24 via the power connection I / O 19.

  A charging voltage is supplied to the charging terminal 44 of the mobile phone 11 via the DC adapter cable 17 and the charger holder 13. The changeover switch 23 detects that the voltage is supplied to the charging terminal 44 and selects the charging circuit 41 side. Thereby, charge to the battery 42 is started (step B4). The earphone jack cable 16 of the charger holder 13 is connected to the earphone jack 12 of the mobile phone 11 (step B5). Thereafter, the mobile phone 11 is operated to activate the music playback function, and music playback is started (step B6).

  The music signal output from the earphone jack 12 is input to the FM modulation unit 25 in the FM transmitter 14 via the earphone jack cable 16, is FM-modulated and then amplified by the variable amplifier 26, and FM waves from the FM antenna 27. (Step B7). The FM radio built-in car stereo 55 is operated, the frequency is adjusted to the output frequency of the FM transmitter 14, and music is output from the vehicle-mounted speaker (step B8). If the reception level on the FM radio side is insufficient, the FM output level controller 15 is adjusted to set the FM wave intensity to an appropriate level (step B9).

  Next, a procedure for listening to music without charging the mobile phone 11 will be described. FIG. 9 shows the procedure. A sufficiently charged battery 42 is attached to the mobile phone 11 (step C1), and the mobile phone 11 is set in the charger holder 13. At this time, the DC adapter cable 17 and the AC adapter cable 18 are not connected to the charger holder 13. The change-over switch 23 is configured such that the charging terminal 29 of the charger holder 13 has no voltage, that is, the charging terminal 29 and the charging terminal 44 of the mobile phone 11 are connected (contacted), and the charging terminal 44 is not connected. It detects that it is a voltage, and it switches to the path | pass which passes through the charging circuit 41 (step C2).

  When the changeover switch switches the path, the voltage of the battery 42 is supplied to the charging terminal 44 of the mobile phone 11. The voltage from the battery 42 is supplied to the FM transmitter power supply 24 via the charging terminal 29 of the charger holder 13 (step C3). That is, the FM transmitter 14 is driven by the battery 42 of the mobile phone 11. Thereafter, the music reproduced by the mobile phone 11 is output from the speaker of the FM radio built-in car stereo 55 or the FM radio built-in stereo component 56 by the same procedure as in steps A5 to A9 or steps B5 to B9 (steps C4 to C9). C8).

  In the present embodiment, the FM transmitter 14 is built in the charger holder 13. In this way, the mobile phone 11 can be downsized as compared with the case where the FM transmitter 14 is built in the mobile phone 11. Further, by taking the power source of the FM transmitter 14 from the DC adapter cable 17 or the AC adapter cable 18 for charging, wiring can be simplified and convenience can be improved. Further, when the mobile phone 11 is set in the charger holder 13 and the external power source is not connected to the charger holder 13, the battery 42 of the mobile phone 11 is used as the power source of the FM transmitter 14. In this way, the FM transmitter 14 can be operated even in a situation where an external power supply cannot be secured, and music playback using the FM radio receiver 50 is possible even in an environment where there is no power supply wiring of the charger holder 13. Is possible.

  In the above embodiment, the FM radio (FM transmitter) is used to play music with an external speaker. However, this can be replaced with other wireless communication means. FIG. 10 shows the configuration of a music playback system according to a modification of the present invention. In this example, the charger holder 13a has Bluetooth 47 instead of the FM transmitter 14 (FIG. 1). In this configuration, it is possible to listen to high-quality music by using an external audio device equipped with Bluetooth and using the speaker of the external audio device as the external speaker. Further, the output from the external speaker is not limited to music, but may be other sounds (voices). For example, the other party's voice (downstream voice) in a mobile phone call is FM-modulated by the FM transmitter 14 and the other party's voice is output to the FM radio receiver. In this case, it can be used as an auxiliary device for a hearing impaired person.

  Although the present invention has been described based on the preferred embodiment, the external speaker utilization system of the present invention is not limited to the above embodiment, and various modifications and changes can be made from the configuration of the above embodiment. Those applied are also included in the scope of the present invention.

The block diagram which shows the structure of the external speaker utilization system (music reproduction system) of one Embodiment of this invention. The figure which shows the external appearance of the back side of a charger holder. The figure which shows the specific example of FM radio receiver. The figure which shows another specific example of FM radio receiver. The block diagram which shows the internal structure of a charger holder. The block diagram which shows the internal structure of a mobile telephone. The flowchart which shows the utilization procedure of the music reproduction system at the time of utilizing an AC adapter. The flowchart which shows the utilization procedure of the music reproduction system at the time of utilizing a DC adapter. The flowchart which shows the utilization procedure of the music reproduction system when not using an external power supply. The block diagram which shows the structure of the music reproduction system of the modification of this invention.

Explanation of symbols

11: Mobile phone 12: Earphone jack 13: Charger holder 14: FM transmitter 15: FM output level controller 16: Earphone jack cable 17: DC adapter cable 18: AC adapter cable 19: I / O for power connection
20: Power connection connector 23: Changeover switch 24: FM transmitter power supply unit 25: FM modulation unit 26: Variable amplifier 27: FM antenna 28, 29: Charging terminal 30: Baseband unit 31: CPU
32: Memory 33: Key matrix input unit 34: LCD display unit 35: Music data memory unit 36: Music data decoder unit 37: Amplifier 38: Receiver 39: Microphone 40: Speaker 41: Charging circuit 42: Battery 43, 44: Charging Terminal 50: FM radio receiver 55: Car stereo with built-in FM radio 56: Stereo component with built-in FM radio

Claims (9)

A first charging terminal that is supplied with power from an external power source and charges the battery of the mobile terminal device ;
A radio transmission section to which the first operates with power supplied to the charging terminal, wirelessly outputs an audio / music signal inputted from the mobile terminal device to an external device connected to the external speaker,
A charger holder without a battery, and
Battery,
An output terminal for outputting audio / music signals;
The first detects the voltage of the charging terminal, wherein when the external power source is power supplied to the first charging terminal to select a path for charging the battery, the external power supply to the first charging terminal When the power is not supplied from, the changeover switch for selecting a path for supplying the power from the battery to the first charging terminal and enabling the wireless transmission unit ;
A mobile terminal device comprising :
An external speaker utilization system characterized by comprising:   The portable terminal device includes a second charging terminal connected to the first charging terminal in a state set in the charger holder, and a charger.
  The selector switch detects a voltage of the second charging terminal, and selects a path for charging the battery via the charger when a predetermined charging voltage is applied to the second charging terminal. The external speaker utilization system according to claim 1, wherein when the second charging terminal is non-voltage, the second charging terminal and the battery are connected.   The charger holder is
  An external power supply connection terminal to which an external power supply is connected;
  A connection line connecting the external power supply connection terminal and the first charging terminal;
  An external signal input terminal,
  With
  The wireless transmitter is
  A modulator for modulating a signal supplied via the external signal input terminal;
  A transmission unit for transmitting the signal modulated by the modulation unit;
  A power supply unit connected to the connection line and supplying the power supplied from the connection line to the modulation unit and the transmission unit;
  Composed of,
  The external speaker utilization system according to claim 1 or 2, characterized in that The external speaker utilization system according to any one of claims 1 to 3, wherein the wireless transmission unit is configured as an FM transmitter that performs FM modulation and outputs an FM wave. The external speaker utilization system according to claim 4 , further comprising an output level adjustment unit that controls an output level of the FM wave. The external speaker utilization system according to any one of claims 1 to 3, wherein the wireless transmission unit is configured as a Bluetooth communication unit that performs Bluetooth communication with the external device. The portable terminal device is provided with a music playback function, and outputs the music signal reproduced by the music reproduction function from said output terminal, an external speaker use system according to any one of claims 1 to 6. The portable terminal device is configured as a mobile phone, the external speaker use system according to any one of claims 1 to 7. From the output terminal, you output the other party voice in a mobile telephone call, the external speaker use system according to claim 8.

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