JP2006293440A - Electric device, electric device system and connection control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric device system, electric device and connection control method for switching the transmission processing of an analog signal or the transmission processing of a digital signal from first electric device to second electric device like a circuit. <P>SOLUTION: When a microcomputer 11 is connected to an audio device 2, the microcomputer 11 opens a switch to disconnect USB connection terminals 10a and 20a, and performs the transmission control of an analog signal from an analog output terminal 10b. When a button 1a for USB connection is operated in this status, the microcomputer 11 closes the switch to connect the USB connection terminals 10a and 20a, and stops the transmission control of the analog signal, and starts the transmission control of a digital signal from the USB connection terminal 10a. When accepting the transmission instruction of the analog signal during the transmission control of the digital signal, the microcomputer 11 opens the switch to disconnect the USB connection terminals 10a and 20a, and stops the transmission control of the digital signal, and starts the transmission control of the analog signal from the analog output terminal 10b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electrical device that can be connected to a device having an input terminal for inputting an external control signal, an analog output terminal for outputting an analog signal, and a digital output terminal for outputting a digital signal. The present invention also relates to an electrical equipment system in which a first electrical equipment as the equipment and a second electrical equipment as the electrical equipment are connected, and in the electrical equipment system, the first electrical equipment and the second electrical equipment are connected. The present invention relates to a connection control method to be controlled.

  As a cable for connecting peripheral devices such as a keyboard, mouse, modem, and digital camera to a personal computer, a USB (Universal Serial Bus) cable that can be inserted and removed without turning off the power of the personal computer and the peripheral device is used. . In addition, when a peripheral device (terminal device) connected to a personal computer (host device) via a USB cable cannot secure its own power supply, power is supplied from the host device via a USB cable power supply line. (See, for example, Patent Document 1).

  The host device connected to the USB cable is not limited to a personal computer. For example, there is an audio device equipped with a speaker, and a music player that can be connected to the USB cable is connected as a terminal device to the audio device via the USB cable. Can be used. In this case, the music player can transfer the music data recorded on the recording medium to the audio device in accordance with the control signal from the audio device, and can reproduce it on the audio device.

Also, music players having an analog output terminal for outputting an analog signal as well as a USB connection terminal for connecting with a USB cable are widely used, and are connected to an audio device having an input terminal for an analog audio signal. Thus, the music data of the digital signal recorded in the music player can be converted into an analog signal, transferred to the audio device, and output by the speaker of the audio device.
JP 2001-265360 A

  As described above, in a music player having a USB connection terminal and an analog output terminal, there is an apparatus in which the USB connection terminal and the analog output terminal are configured as one connector. When such a music player is connected to an audio apparatus having an analog input terminal for inputting an analog signal and a USB connection terminal, if the USB communication protocol is mass storage, the music player and the audio apparatus as terminal devices In general, the audio device controls the music player to perform output processing of a digital signal via USB.

  In this way, when the audio device controls the music player to perform digital signal output processing via USB, the recording medium and file processing unit in the music player are occupied by the digital signal output processing. Cannot perform analog signal output processing. Therefore, in a music player in which the USB connection terminal and the analog output terminal are included in one connector, it is impossible to output an analog signal at the same time as the connection with the audio apparatus is performed. As a result, even a music player having both an analog signal output terminal and a digital signal output terminal can output only a digital signal when connected to the above-described audio apparatus, and the music player can be used effectively. Have the problem of not being able to.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an output terminal connected to each of an input terminal, an analog output terminal, and a digital output terminal included in a device connector of an external device. A connection connector including an analog input terminal and a digital input terminal, and an analog signal or a digital signal output from an external device is acquired from the analog input terminal or the digital input terminal by connecting the connection connector to the device connector. It is to provide an electric device capable of performing the above.

  Another object of the present invention is to connect each of the input terminal, analog output terminal and digital output terminal of the first electric device to the output terminal, analog input terminal and digital input terminal of the second electric device, An electrical device system capable of transferring an analog signal or a digital signal from a first electrical device to a second electrical device, and a connection control method for controlling connection of the first electrical device and the second electrical device in the electrical device system It is to provide.

  Another object of the present invention is to stop the output of the analog signal and start the output of the digital signal when the first electric device that is controlling the output of the analog signal receives an output instruction that instructs the output of the digital signal. In addition, when the first electric device that is controlling the output of the digital signal receives an analog output instruction that instructs the output of the analog signal, the first electric device stops the output of the digital signal and starts outputting the analog signal. An object of the present invention is to provide an electrical device system that can effectively use an analog signal output function and a digital signal output function in a device.

  Another object of the present invention is to connect or disconnect the digital output terminal of the first electrical device and the digital input terminal of the second electrical device by the switching unit inside the first electrical device, so that the digital output terminal or the analog output terminal is connected. It is an object of the present invention to provide an electric device system capable of controlling the output of a signal from any one of the circuits.

  The electrical device according to the present invention is an electrical device that can be connected to a device having a device connector including an input terminal for inputting an external control signal, an analog output terminal for outputting an analog signal, and a digital output terminal for outputting a digital signal. In the device, the device includes a connection connector that can be connected to the device connector, the connection connector connecting to the input terminal and outputting a control signal, and an analog signal output from the analog output terminal And an analog input terminal for inputting a digital signal output from the digital output terminal.

  According to the present invention, an electrical device that can be connected to an external device includes an input terminal included in a device connector of the external device, an analog output terminal, and an output terminal connected to each of the digital output terminals, an analog input A connection connector including a terminal and a digital input terminal is provided. Therefore, it is possible to acquire an analog signal or a digital signal output from an external device by connecting the connection connector to the device connector.

  An electrical device system according to the present invention includes a first electrical device and a second electrical device having an input terminal for inputting a control signal from the outside, an analog output terminal for outputting an analog signal, and a digital output terminal for outputting a digital signal. In the connected electrical equipment system, the second electrical equipment is connected to the input terminal to output a control signal and an analog input terminal to input an analog signal output from the analog output terminal And a digital input terminal for inputting a digital signal output from the digital output terminal, so that the first electric device outputs a signal from either the analog output terminal or the digital output terminal. It has the output control means to control to.

  According to the present invention, a first electrical device having an input terminal, an analog output terminal, and a digital output terminal, an output terminal connected to each of the input terminal, the analog output terminal, and the digital output terminal, an analog input terminal, and a digital input A second electrical device having a terminal is connected, and the first electrical device controls output of a signal from either an analog output terminal or a digital output terminal. Therefore, it becomes possible to transfer an analog signal or a digital signal from the first electric device to the second electric device by connecting the first electric device and the second electric device.

  In the electrical equipment system according to the present invention, the output control means controls to output an analog signal from the analog output terminal when the first electrical equipment and the second electrical equipment are connected, Receiving means for receiving an output instruction for instructing output of a digital signal from the first electrical device, wherein the output control means receives the output instruction when the receiving means receives the output instruction during output control of the analog signal; Control is performed such that the output of the analog signal from the terminal is stopped and the output of the digital signal from the digital output terminal is started.

  According to the present invention, when the first electric device and the second electric device are connected, the first electric device is controlled to output an analog signal from the analog output terminal. In addition, when the first electric device receives an output instruction for instructing output of a digital signal during output control of the analog signal, the first electric device stops outputting the analog signal from the analog output terminal and outputs the digital signal from the digital output terminal. Control to start. Therefore, it is possible to cause the first electric device that is outputting the analog signal to output the digital signal.

  In the electrical equipment system according to the present invention, the receiving means is provided in the second electrical equipment, and the second electrical equipment instructs to output a digital signal when the receiving means accepts the output instruction. The control signal is output from the output terminal, and the output control means is configured to output an analog signal from the analog output terminal when the control signal is input from the input terminal during output control of the analog signal. Control is performed so that signal output is stopped and output of the digital signal from the digital output terminal is started.

  According to the present invention, the second electric device is configured to receive an output instruction for instructing output of a digital signal from the first electric device. When the second electric device receives the output instruction, When the control signal instructing signal output is output to the first electrical device and the first electrical device acquires the control signal during the output control of the analog signal, the first electrical device stops outputting the analog signal from the analog output terminal. Control to start output of a digital signal from the digital output terminal. Therefore, when the user appropriately operates the second electric device, the analog signal output processing by the first electric device can be switched to the digital signal output processing.

  In the electrical equipment system according to the present invention, when the reception means is provided in the first electrical equipment, and the output control means receives the output instruction during output control of an analog signal, the analog output terminal Control is performed so as to stop the output of the analog signal from and to start the output of the digital signal from the digital output terminal.

  According to the present invention, the first electric device is configured to receive an output instruction for instructing output of the digital signal from the first electric device, and the first electric device outputs the output during the output control of the analog signal. When the instruction is accepted, control is performed so that the output of the analog signal from the analog output terminal is stopped and the output of the digital signal from the digital output terminal is started. Therefore, when the user appropriately operates the first electric device, the analog signal output processing by the first electric device can be switched to the digital signal output processing.

  The electrical equipment system according to the present invention includes means for accepting an analog output instruction for instructing output of an analog signal from the first electrical equipment, and the output control means outputs the analog output instruction during output control of a digital signal. If accepted, control is performed such that output of the digital signal from the digital output terminal is stopped and output of the analog signal from the analog output terminal is started.

  According to the present invention, when the first electric device receives an analog output instruction for instructing the output of the analog signal during the output control of the digital signal, the first electric device stops the output of the digital signal from the digital output terminal, and the analog output terminal To start the output of the analog signal from. Therefore, it is possible to cause the first electric device in a state of outputting a digital signal to output an analog signal.

  In the electrical equipment system according to the present invention, when the digital output terminal of the first electrical equipment and the digital input terminal of the second electrical equipment are connected, there is a data transmission path between the digital output terminal and the digital input terminal. The first electrical device is formed between a load unit having one end connected to the data transmission path via a digital output terminal and the other end connected to a power source, and the other end of the load unit and the power source. A switching unit that switches between connection and disconnection of the other end and the power source, and the output control means controls switching of the switching unit so as to connect or disconnect the other end of the load unit and the power source. By performing the above, control is performed so that a signal is output from the digital output terminal or the analog output terminal.

  According to the present invention, the first electrical device has a load section in which one end is connected to the data transmission path formed between the digital output terminal and the digital input terminal via the digital output terminal, and the other end is connected to the power source. And a switching unit that is provided between the other end of the load unit and the power source and performs switching between connection and disconnection of the other end and the power source. The first electric device performs control so that a signal is output from the digital output terminal or the analog output terminal by performing switching control of the switching unit so as to connect or disconnect the other end of the load unit and the power source. Therefore, it is possible to connect and disconnect between the digital output terminal and the digital input terminal in a circuit by the switching unit.

  A connection control method according to the present invention includes: an input terminal for inputting an external control signal; an analog output terminal for outputting an analog signal; a first electric device having a digital output terminal for outputting a digital signal; and the input terminal. A second electric circuit having an output terminal for connecting and outputting a control signal, an analog input terminal for inputting an analog signal output from the analog output terminal, and a digital input terminal for inputting a digital signal output from the digital output terminal A connection control method for controlling connection with a device, comprising the step of controlling the first electric device to output a signal from either the analog output terminal or the digital output terminal. .

  According to the present invention, a first electrical device having an input terminal, an analog output terminal, and a digital output terminal, an output terminal connected to each of the input terminal, the analog output terminal, and the digital output terminal, an analog input terminal, and a digital input A second electrical device having a terminal is connected, and the first electrical device controls to output a signal from either an analog output terminal or a digital output terminal. Therefore, an analog signal or a digital signal can be transferred from the first electric device to the second electric device.

  In the present invention, an electrical device that can be connected to an external device is an input terminal included in a device connector of the external device, an output terminal connected to each of an analog output terminal and a digital output terminal, an analog input terminal, and A connection connector including a digital input terminal is provided. Therefore, an analog signal or a digital signal output from an external device can be obtained from the analog input terminal or the digital input terminal by connecting the connection connector to the device connector without connecting to an external device via a connection cable. can do.

  In the present invention, each of the input terminal, the analog output terminal, and the digital output terminal of the first electrical device is connected to the output terminal, the analog input terminal, and the digital input terminal of the second electrical device, so that 2 Analog or digital signals can be transferred to electrical equipment. Therefore, the analog signal output function or digital signal output function of the first electrical device can be easily used.

  In the present invention, when receiving an output instruction for instructing output of a digital signal to the first electric device in a state of outputting an analog signal, the first electric device outputs an analog signal from the analog output terminal. And start outputting digital signals from the digital output terminals. Therefore, the analog signal output function and the digital signal output function of the first electric device can be switched appropriately and used effectively.

  In the present invention, an output instruction for instructing output of a digital signal from the first electric device is configured to be received by the second electric device. When the second electric device receives the output instruction, A control signal for instructing output is output to the first electric device. When the first electric device acquires the control signal during the output control of the analog signal, the first electric device stops outputting the analog signal from the analog output terminal and starts outputting the digital signal from the digital output terminal. Therefore, when the user appropriately operates the second electric device, the analog signal output processing by the first electric device can be switched to the digital signal output processing, and the analog signal output function of the first electric device and The digital signal output function can be effectively used as appropriate.

  In the present invention, the first electric device is configured to receive an output instruction for instructing output of a digital signal from the first electric device, and the first electric device outputs the output instruction during output control of the analog signal. When accepted, the output of the analog signal from the analog output terminal is stopped, and the output of the digital signal from the digital output terminal is started. Therefore, when the user appropriately operates the first electric device, the analog signal output processing by the first electric device can be switched to the digital signal output processing, and the analog signal output function of the first electric device and The digital signal output function can be effectively used as appropriate.

  In the present invention, when an analog output instruction for instructing output of an analog signal is received with respect to the first electric device in a state of outputting a digital signal, the first electric device receives the digital signal from the digital output terminal. Stops output and starts outputting analog signals from the analog output terminal. Therefore, the analog signal output function and the digital signal output function of the first electric device can be switched appropriately and used effectively.

  In the present invention, the first electrical device is connected to a data transmission path formed between the digital output terminal and the digital input terminal via the digital output terminal and the other end is connected to the power source. The switching unit provided between the end and the power source connects or disconnects the other end of the load unit and the power source. Therefore, by connecting and disconnecting the digital output terminal and the digital input terminal in a circuit by the switching unit, a signal can be output from the digital output terminal or the analog output terminal.

  In the present invention, a first electric device having an input terminal, an analog output terminal, and a digital output terminal, and an output terminal, an analog input terminal, and a digital input terminal connected to each of the input terminal, the analog output terminal, and the digital output terminal are provided. The first electric device is controlled to output a signal from either an analog output terminal or a digital output terminal. Therefore, an analog signal or a digital signal can be transferred from the first electric device to the second electric device.

  Below, the electric equipment system concerning the present invention is explained in full detail based on a drawing which shows the embodiment. FIG. 1 is a perspective view showing a configuration example of an electric equipment system according to the present invention. The electrical device system of this embodiment is configured by connecting a music player 1 as a first electrical device and an audio device 2 as a second electrical device.

  The music player 1 is formed in a rectangular parallelepiped housing, and includes a USB connection button 1a (described later) on one side surface and a device connector 10 (see FIG. 2) for connecting to the audio device 2 on the bottom surface. Yes. On the other hand, the audio device 2 is formed in a rectangular parallelepiped casing and includes a speaker 2a on one side surface. A cradle 2b having a connection connector 20 on the upper surface projects from the lower center of the arrangement surface of the speaker 2a of the audio apparatus 2. On the upper surface of the cradle 2b, a concave portion having a rectangular cross section of the same size as the bottom surface of the music player 1 is formed, and a connection connector 20 that can be connected to the device connector 10 of the music player 1 on the bottom surface of the concave portion. Is provided.

  With the configuration described above, when the music player 1 is mounted on the cradle 2b of the audio device 2 in the direction indicated by the arrow A, the device connector 10 of the music player 1 and the connection connector 20 of the cradle 2b are directly connected. At the same time, the cradle 2b can support and fix the connected music player 1.

  FIG. 2 is a block diagram showing a schematic configuration example of the electrical equipment system according to the present invention. The device connector 10 of the music player 1 includes an input terminal 10c for inputting a control signal from the audio device 2, an analog output terminal 10b for outputting an analog signal, and a USB connection terminal 10a for connecting to a USB. . The connection connector 20 of the audio device 2 is connected to the input terminal 10c of the music player 1 and output from the output terminal 20c that outputs a control signal to the music player 1 and the analog output terminal 10b of the music player 1. An analog input terminal 20b for inputting an analog signal and a USB connection terminal 20a for connecting to a USB are included.

  Therefore, by mounting the music player 1 on the cradle 2b of the audio device 2, between the audio device 2 and the music player 1, control signal transmission processing via the output terminal 20c and the input terminal 10c, the analog output terminal 10b, An analog signal transmission process via the analog input terminal 20b and a digital signal transmission process via the USB connection terminals 10a and 20a are possible. Note that the music player 1 of this embodiment is configured to control the output of an analog signal from the analog output terminal 10b when mounted on the cradle 2b of the audio device 2 and connected to the audio device 2.

  The music player 1 includes a microcomputer 11 that performs calculations, a device control unit 12 connected to an input terminal 10c, a file processing unit 13, a recording device 14, a digital signal processing unit 15, a DAC (D / A converter) 16, and a USB driver. 17, USB terminal controller 18 etc. are provided as main components. The microcomputer 11 operates as a control center of the music player 1 and controls the operations of the above-described hardware components connected to each other. 2 shows a configuration in which the microcomputer 11 is connected to the device control unit 12, the file processing unit 13, and the digital signal processing unit 15, the microcomputer 11 is also connected to other hardware units.

  The device control unit 12 acquires the control signal output from the output terminal 20 c of the audio device 2 via the input terminal 10 c and outputs the acquired control signal to the microcomputer 11. The microcomputer 11 controls each hardware part of the music player 1 in accordance with the control signal acquired from the device control unit 12, whereby the music player 1 can perform an operation according to the control signal from the audio device 2. .

  The recording device 14 is composed of a large-capacity hard disk, for example, and records digital music data. The music player 1 is configured to be connectable to a PC via USB, and music data acquired from the PC connected via the device connector 10 is recorded in the recording device 14. The file processing unit 13 operates as an ATA controller when the recording device 14 is a hard disk, and also operates as a file system that controls reading and writing of music data with respect to the recording device 14 according to control by the microcomputer 11.

  The digital signal processing unit 15 is connected to the file processing unit 13, performs predetermined digital signal processing on digital music data read from the recording device 14 by the file processing unit 13 in accordance with control by the microcomputer 11, and outputs the digital music data to the DAC 16. . For example, when the MP3 format music data is recorded in the recording device 14, the digital signal processing unit 15 includes a decoder that decodes and decompresses the MP3 format music data into an audio signal. The DAC 16 converts the digital audio signal decoded and expanded by the digital signal processor 15 under the control of the microcomputer 11 into an analog audio signal (analog signal), and outputs the analog audio signal from the analog output terminal 10b.

  The USB driver 17 is connected to the file processing unit 13, and outputs digital music data read from the recording device 14 by the file processing unit 13 to the USB terminal controller 18 under the control of the microcomputer 11. The USB terminal controller 18 is an interface for transmitting and receiving data to and from the audio apparatus 2 via the USB connection terminals 10a and 20a, and digital music data acquired from the USB driver 17 is transmitted to the USB connection terminal (digital output). Output from the terminal 10a to the audio device 2.

  On the other hand, the audio apparatus 2 includes a microcomputer 21 that performs computation, a terminal device control unit 22 connected to the output terminal 20c, an analog output processing unit 23, an analog signal processing unit 24, a USB host controller 25, a digital signal processing unit 26, and a DAC 27. The operation unit 28, the display unit 29, and the like are provided as main components. The microcomputer 21 operates as a control center of the audio device 2 and controls the operation of each of the above-described hardware components connected to each other. 2 shows a configuration in which the microcomputer 21 is connected to the terminal device control unit 22, the operation unit 28, and the display unit 29, the microcomputer 21 is also connected to other hardware units. The terminal device control unit 22 outputs various control signals to the music player 1 through the output terminal 20 c in accordance with control by the microcomputer 21.

  The analog signal processing unit 24 performs predetermined signal processing on the analog audio signal output from the analog output terminal 10 b of the music player 1 and outputs it to the analog output processing unit 23. The analog output processing unit 23 includes, for example, an audio amplification circuit, amplifies the audio signal acquired from the analog signal processing unit 24 to a predetermined size, outputs the amplified audio signal to the speaker 2a, and causes the speaker 2a to reproduce and output the audio signal.

  The USB host controller 25 is an interface for transmitting and receiving data to and from the music player 1 via the USB connection terminals 20a and 10a. The USB host controller 25 receives digital music data output from the USB connection terminal 10a of the music player 1. Obtained via the USB connection terminal (digital input terminal) 20 a and output to the digital signal processing unit 26. The digital signal processing unit 26 performs predetermined digital signal processing on digital music data acquired from the USB host controller 25 and outputs the digital music data to the DAC 27.

  For example, when the MP3 format music data is acquired from the USB connection terminal 20a, the digital signal processing unit 15 includes a decoder that decodes and decompresses the MP3 format music data into an audio signal. The DAC 27 converts the digital audio signal decoded and expanded by the digital signal processing unit 26 under the control of the microcomputer 21 into an analog audio signal and outputs the analog audio signal to the analog output processing unit 23. The analog output processing unit 23 also amplifies the audio signal acquired from the DAC 27 to a predetermined size, outputs it to the speaker 2a, and causes the speaker 2a to reproduce and output it.

  The operation unit 28 includes various keys necessary for the user to operate the audio device 2. When each key is operated by the user, a control signal corresponding to the operated key is sent to the microcomputer 21. The Thereby, the microcomputer 21 can execute various processes according to the control signal acquired from the operation unit 28. The display unit 29 is a display device made up of, for example, a liquid crystal display panel, and displays the operating state of the audio apparatus 2 and information to be notified to the user.

  FIG. 3 is a block diagram illustrating a schematic configuration example of the electrical device system according to the present invention, and illustrates a configuration example of the peripheral portion of the USB connection terminals 10a and 20a in the electrical device system. When the music player 1 is mounted on the cradle 2b of the audio device 2 and the music player 1 and the audio device 2 are connected, power is supplied from the audio device 2 to the music player 1 between the USB connection terminals 10a and 20a. Data transmission paths D + and D− for transmitting and receiving data between the audio device 2 and the music player 1 are formed.

  The USB connection terminal 20a of the audio device 2 has a power supply terminal, a ground terminal, a D + terminal, and a D- terminal for connecting to the power supply path Vbus, the ground path GND, and the data transmission paths D + and D-, respectively. Similarly, the USB connection terminal 10a of the music player 1 also has a power supply terminal, a ground terminal, a D + terminal, and a D- terminal for connecting to the power supply path Vbus, the ground path GND, and the data transmission paths D + and D-, respectively. Yes.

  The USB host controller 25 of the audio device 2 is connected to the D + terminal and D− terminal of the USB connection terminal 20a, and receives data (data (1) to the music player 1 via the data transmission paths D + and D− under the control of the microcomputer 21. Command). In the audio device 2, the power supply terminal of the USB connection terminal 20a is connected to the power supply Vcc, and the ground terminal of the USB connection terminal 20a is connected to the ground (0V) GND. The audio apparatus 2 has one end connected to the D-terminal of the USB connection terminal 20a, the other end connected to the power supply Vcc, and the other end connected to the D + terminal of the USB connection terminal 20a. And a resistor (pull-down resistor) R2 having the other end connected to the ground GND.

  The USB terminal controller 18 of the music player 1 is connected to the D + terminal and the D− terminal of the USB connection terminal 10a, and transmits and receives data to and from the audio device 2 through the data transmission paths D + and D− according to control by the microcomputer 11. Do. In the music player 1, the ground terminal of the USB connection terminal 10a is connected to the ground GND. Further, the music player 1 has one end connected to the D + terminal of the USB connection terminal 10a and the other end connected to the power supply terminal of the USB connection terminal 10a. A resistor (pull-down resistor) R2 connected to the D-terminal of the connection terminal 10a and having the other end connected to the ground GND is provided.

  Further, the music player 1 is provided with a switch (switching unit) SW for opening and closing between the power supply terminal of the USB connection terminal 10a and the resistor R1, and according to control by the microcomputer 11, the power supply terminal of the USB connection terminal 10a and the resistance R1. Can be switched between circuit connection and disconnection. The resistor R1 provided in the music player 1 is not limited to a single resistor, but may be, for example, an element or circuit equivalent to a resistor, a coil, or the like, an element or circuit having an internal resistance, and operates as a resistor. Various elements and circuits configured to do so may be used.

  In the electrical device system having the above-described configuration, when the music player 1 and the audio device 2 are connected, power is supplied from the audio device 2 to the music player 1 via the power supply path Vbus formed between the USB connection terminals 10a and 20a. Therefore, the resistance R1 of the music player 1 is pulled up to a predetermined voltage. The voltage at the D + terminal of the USB connection terminal 10a due to the pull-up of the resistor R1 of the music player 1 is transmitted to the D + terminal of the audio device 2 via the data transmission path D + formed between the USB connection terminals 10a and 20a. Thus, the USB host controller 25 can detect that the music player 1 is connected.

  Here, in the electrical device system of this embodiment, when the music player 1 and the audio device 2 are connected, the microcomputer (output control means) 11 of the music player 1 is connected via the analog output terminal 10b and the analog input terminal 20b. It is configured to perform either analog signal transmission processing or digital signal transmission processing via the USB connection terminals 10a and 20a. Therefore, even when the music player 1 and the audio device 2 are connected via the device connector 10 and the connection connector 20, the analog signal and the digital signal cannot be simultaneously output from the music player 1 to the audio device 2.

  Specifically, in the above-described electrical equipment system, when the music player 1 is mounted on the cradle 2b of the audio device 2 and the music player 1 and the audio device 2 are connected, the microcomputer 11 of the music player 1 sets the switch SW. By controlling to open, the power supply terminal of the USB connection terminal 10a and the resistor R1 are disconnected. As a result, immediately after the music player 1 and the audio device 2 are connected, the connection via the USB connection terminals 10a and 20a is disconnected, so that the digital signal transmission process from the music player 1 to the audio device 2 is performed. Thus, only analog signal transmission processing is performed.

  Here, the USB connection button (accepting means) 1a of the music player 1 instructs the music player 1 that is performing the analog signal transmission processing as described above to output a digital signal via the USB. The button to use. Therefore, when the user operates the USB connection button 1a, the USB connection button 1a sends an output instruction for instructing output of a digital signal to the microcomputer 11. The USB connection button 1a may be a push button type that can be turned on by pressing, or may be a slide type that can be turned on and off by sliding. Further, the USB connection button 1a does not need to be a dedicated button, and can be instructed to connect the USB connection terminals 10a and 20a by appropriately operating an operation unit (not shown) provided in the music player 1. The music player 1 only needs to be configured.

  When the microcomputer 11 acquires an output instruction from the USB connection button 1a while controlling the analog signal transmission processing without performing the digital signal transmission processing by opening the switch SW as described above, By controlling the switch SW to be closed, the power supply terminal of the USB connection terminal 10a and the resistor R1 are connected. As a result, the resistor R1 of the music player 1 is pulled up to a predetermined voltage, and the voltage of the D + terminal of the USB connection terminal 10a due to the pulling up of the resistor R1 becomes the D + terminal of the audio device 2 via the data transmission path D +. Is transmitted to. Therefore, the USB host controller 25 can detect that the music player 1 is connected, the analog signal transmission from the music player 1 to the audio device 2 is stopped, and the digital signal is transmitted via the USB connection terminals 10a and 20a. Signal transmission is started.

  On the other hand, the analog signal transmission process from the music player 1 to the audio device 2 is performed again in a state where the digital signal transmission process via the USB connection terminals 10a and 20a is possible by closing the switch SW as described above. In this case, the user gives an instruction to start the analog signal transmission process by appropriately operating the operation unit 28 according to a predetermined screen displayed on the display unit 29 of the audio device 2. Note that the audio device 2 may have a configuration including a dedicated operation button for starting analog signal transmission processing.

  When the microcomputer 21 of the audio device 2 receives an instruction to start analog signal transmission processing by the user, the microcomputer 21 sends an analog output instruction to instruct analog signal transmission processing from the D + terminal and the D− terminal of the USB connection terminal 20a. Send to 1. When the USB terminal controller 18 of the music player 1 accepts an analog output instruction via the D + terminal and the D− terminal of the USB connection terminal 10a, the USB terminal controller 18 notifies the microcomputer 11 and the microcomputer 11 sets the closed switch SW. By controlling to open, the power supply terminal of the USB connection terminal 10a and the resistor R1 are disconnected. Thereby, the transmission of the digital signal from the music player 1 to the audio device 2 is stopped, and the transmission of the analog signal is started.

  With the configuration described above, immediately after the music player 1 and the audio device 2 are connected, the music player 1 controls the transmission of analog signals to the audio device 2, and the USB connection button 1a of the music player 1 by the user. Is operated, the music player 1 stops the transmission control of the analog signal to the audio device 2 and starts the transmission control of the digital signal. In addition, when the music player 1 performs transmission control of the digital signal to the audio device 2 and the user instructs the output of the analog signal by operating the operation unit 28 of the audio device 2 appropriately, the music player 1 stops transmission control of a digital signal to the audio apparatus 2 and starts transmission control of an analog signal. Therefore, the analog signal output function and digital signal output function of the music player 1 can be used effectively.

  Hereinafter, in the electrical equipment system having the above-described configuration, when the music player 1 performing the transmission process of the analog signal to the audio device 2 starts the transmission process of the digital signal to the audio device 2, the music player 1 Processing to be performed will be described. FIG. 4 is a flowchart showing a procedure of switching processing from analog signal transmission processing to digital signal transmission processing by the music player 1 in the electric equipment system according to the present invention. The following processing is executed by the microcomputer 11 in accordance with a control program stored in a ROM built in the microcomputer 11.

  When the music player 1 is mounted on the cradle 2b of the audio device 2 and the music player 1 and the audio device 2 are connected, the microcomputer 11 of the music player 1 controls to open the switch SW (S1), The power supply terminal of the USB connection terminal 10a and the resistor R1 are disconnected. As a result, since the connection via the USB connection terminals 10a and 20a is disconnected, the music player 1 transmits an analog signal to the audio device 2 immediately after the music player 1 and the audio device 2 are connected. The process is controlled (S2). Specifically, the microcomputer 11 reads out music data from the recording device 14 according to the control signal output from the output terminal 20c of the audio device 2, and the read music data is read by the file processing unit 13, the digital signal processing unit 15, and the DAC 16. Each is subjected to predetermined processing and then output from the analog output terminal 10b.

  In the music player 1 performing the transmission process of the analog signal to the audio device 2, the microcomputer 11 determines whether or not the USB connection button 1a is operated (S3), and the USB connection button 1a is operated. If not (S3: NO), the transmission control of the analog signal to the audio device 2 is continued (S2). If the microcomputer 11 determines that the USB connection button 1a has been operated (S3: YES), the microcomputer 11 determines whether the switch SW has already been opened (S4). If the microcomputer 11 determines that the switch SW is open (S4: YES), the microcomputer 11 controls the switch SW to close (S5), thereby connecting the power supply terminal of the USB connection terminal 10a and the resistor R1. .

  When the switch SW is thus closed, the resistor R1 of the music player 1 is pulled up to a predetermined voltage, and the voltage of the D + terminal of the USB connection terminal 10a is transmitted to the D + terminal of the audio device 2 via the data transmission path D +. Is done. Therefore, the USB host controller 25 of the audio device 2 can detect that the music player 1 is connected, and the microcomputer 11 of the music player 1 can digitally connect to the audio device 2 via the USB connection terminals 10a and 20a. Signal transmission processing is controlled (S6). In this state, analog signal transmission control from the music player 1 to the audio device 2 is stopped.

  On the other hand, when the microcomputer 11 determines that the switch SW is not opened (S4: NO), that is, the switch SW is closed, and transmission control of the digital signal via the USB connection terminals 10a and 20a has already started. If not, a notification means (not shown) notifies the user that the transmission of the digital signal to the audio apparatus 2 is being controlled (S7). As the notification means, display of a notification message, output of sound, lighting of a warning lamp, etc. can be used.

  In the following, in the electrical equipment system having the above-described configuration, the music player 1 performing the digital signal transmission process to the audio device 2 by closing the switch SW as described above is used to transmit the analog signal to the audio device 2. A process performed by the music player 1 when the transmission process is started will be described. FIG. 5 is a flowchart showing a procedure of switching processing from digital signal transmission processing to analog signal transmission processing by the music player 1 in the electrical equipment system according to the present invention. The following processing is executed by the microcomputers 11 and 21 in accordance with a control program stored in a ROM built in the microcomputers 11 and 21.

  In the music player 1 in which the music player 1 and the audio device 2 are connected and the switch SW is closed, the microcomputer 11 controls digital signal transmission processing via the USB connection terminals 10a and 20a (S11). . Specifically, the microcomputer 11 reads out music data from the recording device 14 in accordance with control signals output from the D + terminal and the D− terminal of the USB connection terminal 20a of the audio device 2, and reads the read music data into the file processing unit 13, The data is output from the USB connection terminal 10a via the USB driver 17 and the USB terminal controller 18.

  The microcomputer 21 of the audio apparatus 2 acquires the music data output from the music player 1 by the USB host controller 25 via the USB connection terminal 20a, and the acquired music data is a digital signal processing unit 26, a DAC 27, and an analog output processing unit. After performing predetermined processing according to 23, reproduction is performed from the speaker 2a (S12). In the audio device 2 that is playing back digital music data acquired from the music player 1, the microcomputer 21 appropriately outputs an analog signal by operating the operation unit 28 according to a predetermined screen displayed on the display unit 29 by the user. It is determined whether an instruction to start the transmission process has been received (S13).

  If the microcomputer 21 of the audio device 2 determines that the instruction to start the analog signal transmission process is not received (S13: NO), the reproduction of the music data acquired from the music player 1 from the speaker 2a is continued (S12). ). If the microcomputer 11 determines that an instruction to start the analog signal transmission process has been received (S13: YES), an analog output instruction to instruct the analog signal transmission process is received from the D + terminal and the D- terminal of the USB connection terminal 20a. The data is sent to the player 1 (S14).

  The microcomputer 11 of the music player 1 determines whether or not an analog output instruction has been acquired from the audio device 2 (S15). If it is determined that an analog output instruction has not been acquired (S15: NO), step S11 is performed. And the digital signal transmission processing via the USB connection terminals 10a and 20a is continued. If the microcomputer 11 determines that an analog output instruction has been acquired (S15: YES), the microcomputer 11 determines whether the switch SW has already been opened (S16) and determines that the switch SW has been opened. (S16: YES), that is, the switch SW is released, the digital signal transmission control through the USB connection terminals 10a and 20a is stopped, and the analog signal transmission control through the analog output terminal 10b and the analog input terminal 20b. Is started, the notification means notifies the user that the transmission of the analog signal to the audio apparatus 2 is being controlled (S17).

  On the other hand, when the microcomputer 11 of the music player 1 determines that the switch SW is not opened (S16: NO), by controlling the switch SW to be opened (S18), the power supply terminal of the USB connection terminal 10a is controlled. The resistor R1 is disconnected. As a result, since the connection via the USB connection terminals 10a and 20a is disconnected, the music player 1 controls the transmission process of the analog signal to the audio device 2 (S19). In this state, digital signal transmission control from the music player 1 to the audio device 2 is not performed.

  As described above, in the music player 1 and the audio device 2 that are connected, the music for which the analog signal transmission control to the audio device 2 is controlled by the user operating the USB connection button 1 a of the music player 1. The player 1 can stop the analog signal transmission control and start the digital signal transmission control. In addition, when the user appropriately operates the operation unit 28 of the audio device 2, the music player 1 that performs transmission control of the digital signal to the audio device 2 stops the transmission control of the digital signal and outputs the analog signal. Transmission control can be started. Therefore, the analog signal output function and digital signal output function of the music player 1 can be used effectively.

  In the above-described embodiment, the configuration in which the music player 1 controls transmission of analog signals to the audio device 2 immediately after the music player 1 and the audio device 2 are connected has been described. However, the music player 1 transmits digital signals. The structure which performs control may be sufficient. In this case, instead of providing the music player 1 with the USB connection button 1a, an analog connection button or a USB disconnection button may be provided.

  In the above-described embodiment, the music player 1 performing the transmission control of the analog signal to the audio device 2 operates the USB connection button 1a of the music player 1 when performing the transmission control of the digital signal. As described above, switching from analog signal transmission control to digital signal transmission control may be instructed by operating the audio device 2. In this case, the switching may be instructed by appropriately operating the operation unit 28 according to a predetermined screen displayed on the display unit 29 of the audio device 2, and a dedicated button is provided on the audio device 2. It may be a configuration.

  Specifically, when the audio device 2 receives an instruction to switch from analog signal transmission control to digital signal transmission control, the microcomputer 21 sends a control signal for instructing digital signal output from the output terminal 20 c to the music player 1. And obtaining the control signal, the music player 1 may be configured to stop the transmission control of the analog signal and start the transmission control of the digital signal.

  Further, in the above-described embodiment, the configuration in which the music player 1 is mounted and connected to the cradle 2b of the audio device 2 has been described. However, it is not necessary to provide the audio device 2 with the cradle 2b. For example, the device connector 10 of the music player 1 and the connection connector 20 of the audio device 2 may be directly connected. The output terminal 20 c of the audio device 2, the input terminal 10 c of the music player 1, and the analog output of the music player 1 The terminal 10b, the analog input terminal 20b of the audio device 2, the USB connection terminal 10a of the music player 1, and the USB connection terminal 20a of the audio device 2 may be connected via different connection cables.

It is a perspective view which shows the structural example of the electric equipment system which concerns on this invention. It is a block diagram which shows the schematic structural example of the electric equipment system which concerns on this invention. It is a block diagram which shows the schematic structural example of the electric equipment system which concerns on this invention. It is a flowchart which shows the procedure of the switching process from the transmission process of an analog signal by the music player to the transmission process of a digital signal. It is a flowchart which shows the procedure of the switching process from the transmission process of the digital signal by the music player to the transmission process of an analog signal.

Explanation of symbols

1 Music player (first electric device)
1a USB connection button (reception means)
10 Device connector 10a USB connection terminal (digital output terminal)
10b Analog output terminal 10c Input terminal 11 Microcomputer (output control means)
R1 resistance (load section)
SW switch (switching part)
2 Audio devices (second electrical equipment, electrical equipment)
20 connection connector 20a USB connection terminal (digital input terminal)
20b Analog input terminal 20c Output terminal

Claims (8)

In an electrical device that can be connected to a device having a device connector including an input terminal that inputs an external control signal, an analog output terminal that outputs an analog signal, and a digital output terminal that outputs a digital signal,
A connection connector capable of connection with the device connector is provided,
The connector is
An output terminal for connecting to the input terminal and outputting a control signal;
An analog input terminal for inputting an analog signal output from the analog output terminal;
An electrical apparatus comprising: a digital input terminal for inputting a digital signal output from the digital output terminal. In an electrical equipment system in which a first electrical equipment and a second electrical equipment having an input terminal for inputting an external control signal, an analog output terminal for outputting an analog signal, and a digital output terminal for outputting a digital signal are connected,
The second electrical device is
An output terminal for connecting to the input terminal and outputting a control signal;
An analog input terminal for inputting an analog signal output from the analog output terminal;
A digital input terminal for inputting a digital signal output from the digital output terminal;
The first electrical device has an output control means for controlling to output a signal from either the analog output terminal or the digital output terminal. The output control means controls to output an analog signal from the analog output terminal when the first electric device and the second electric device are connected,
Receiving means for receiving an output instruction for instructing output of a digital signal from the first electrical device;
The output control means stops the output of the analog signal from the analog output terminal and outputs the digital signal from the digital output terminal when the receiving means receives the output instruction during the output control of the analog signal. The electric device system according to claim 2, wherein the electric device system is controlled to start. The reception means is provided in the second electric device,
The second electrical device is configured to output a control signal for instructing output of a digital signal from the output terminal when the accepting unit accepts the output instruction,
The output control means stops the output of the analog signal from the analog output terminal when the control signal is input from the input terminal during the output control of the analog signal, and outputs the digital signal from the digital output terminal. The electric device system according to claim 3, wherein control is performed so as to start. The reception means is provided in the first electric device,
When the output control unit receives the output instruction during the output control of the analog signal, the output control unit stops outputting the analog signal from the analog output terminal and starts outputting the digital signal from the digital output terminal. It controls, The electric equipment system of Claim 3 characterized by the above-mentioned. Means for receiving an analog output instruction for instructing output of an analog signal from the first electrical device;
The output control means stops the output of the digital signal from the digital output terminal and starts outputting the analog signal from the analog output terminal when receiving the analog output instruction during the output control of the digital signal. The electrical equipment system according to claim 2, wherein the electrical equipment system is controlled as follows. When the digital output terminal of the first electrical device and the digital input terminal of the second electrical device are connected, a data transmission path is formed between the digital output terminal and the digital input terminal,
The first electric device is:
A load unit having one end connected to the data transmission path via a digital output terminal and the other end connected to a power source;
A switching unit that is provided between the other end of the load unit and the power source, and performs switching between connection and disconnection of the other end and the power source,
The output control means controls to output a signal from the digital output terminal or the analog output terminal by performing switching control of the switching unit so as to connect or disconnect the other end of the load unit and a power source. The electrical equipment system according to any one of claims 2 to 6, wherein the system is an electrical equipment system. A first electrical device having an input terminal for inputting an external control signal, an analog output terminal for outputting an analog signal, and a digital output terminal for outputting a digital signal is connected to the input terminal to output a control signal. Connection control for controlling connection with a second electric device having an output terminal, an analog input terminal for inputting an analog signal output from the analog output terminal, and a digital input terminal for inputting a digital signal output from the digital output terminal A method,
A connection control method comprising the step of controlling the first electrical device to output a signal from either the analog output terminal or the digital output terminal.

Images