JP2010211782A - Apparatus and system for determining device type - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To determine more types of devices than that can be determined by one AD port without adding an AD port of a microcomputer. <P>SOLUTION: When an option device is connected to an AV amplifier, input voltage input to an AD port of a microcomputer changes in accordance with the type of the option device. The AV amplifier manages the type of the option device in association with the voltage value of the input voltage. When the voltage value of the input voltage is not a predetermined voltage value, the type managed in association with the voltage value is discriminated as the type of the connected option device. When the voltage value is the predetermined voltage value, the type of the connected option device is determined by acquiring information on the type from the option device. By providing a plurality of types for the predetermined voltage value, it is possible to determine more device types than that can be determined by one AD port without adding an AD port. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a device type determination device that determines the type of a second electronic device connected to a first electronic device.

  To the AV amplifier (first electronic device), a BD player as a source device and a display device as a sink device are connected. The AV amplifier amplifies the audio signal received from the BD player, reproduces the audio from the speaker, and transmits the video signal received from the BD player to the display device. The AV amplifier has a connector, and a plurality of types of optional devices (second electronic devices) can be connected to the connector. Optional devices are, for example, a charging device (cradle) for a portable audio player (DAP), a digital radio tuner (HD radio tuner, DAB tuner), and the like. The AV amplifier executes processing corresponding to the connected optional device by determining the type of the optional device connected to the connector.

  The following method has been proposed as a method for determining the type of option device to be connected (Patent Document 1 below). A predetermined voltage is divided by the resistance value of the resistance element provided in the AV amplifier and the resistance value of the resistance element provided in the optional device, and the divided voltage is input to the AD port of the microcomputer. The microcomputer performs AD conversion on the voltage input to the AD port, and determines the type of the connected optional device based on the AD value. In this method, when the resolution of the AD port is, for example, 8 levels, only one type of eight optional devices can be determined by one AD port. Therefore, in order for the AV amplifier to be able to discriminate nine or more types of optional devices, it is necessary to provide two or more AD ports in the microcomputer, which increases costs.

JP 2008-97298 A

  The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to identify the number of device types exceeding the resolution of the AD port without increasing the AD port of the microcomputer. It is to provide a discrimination device.

  A device type determination device according to a preferred embodiment of the present invention is a device type determination device that determines the types of a plurality of types of second electronic devices connected to a first electronic device, and is connected to the second type. Control means having an input terminal that changes the voltage value of the input voltage according to the type of the electronic device, managing the type of the second electronic device in association with the voltage value of the input voltage, and at least A type management unit that manages that the type of the second electronic device is acquired from the second electronic device by a predetermined communication unit in association with one predetermined voltage value, and the control unit includes the input If the voltage value of the input voltage is other than the predetermined voltage value based on the voltage value of the voltage and the management content of the type management unit, the type management unit manages the voltage value in association with the voltage value of the input voltage. Type If the input electronic voltage is determined to be the type of the second electronic device and the voltage value of the input voltage is the predetermined voltage value, the type of the second electronic device is determined by the predetermined communication means from the second electronic device. get.

  When the second electronic device is connected to the first electronic device, the input voltage input to the input terminal of the control means changes according to the type of the second electronic device. The type management means manages the type of the second electronic device in association with the voltage value of the input voltage. When the voltage value of the input voltage is not a predetermined voltage value, the control unit determines that the type managed by the type management unit in association with the voltage value is the type of the connected second electronic device. On the other hand, when the voltage value of the input voltage is a predetermined voltage value, the control means obtains information about the type of the second electronic device from the connected second electronic device, thereby connecting the connected first The type of the second electronic device is determined. Therefore, by providing a plurality of types of second electronic devices in which the voltage value of the input voltage is a predetermined voltage value, the voltage value that can be determined by the input terminal of the control means without increasing the number of input terminals of the control means. The number of device types exceeding the number can be determined.

  A device type determination system according to a preferred embodiment of the present invention includes a first electronic device and a plurality of types of second electronic devices connected to the first electronic device, wherein the first electronic device includes: Control means having an input terminal that changes the voltage value of the input voltage according to the type of the second electronic device to be connected, and the type of the second electronic device in association with the voltage value of the input voltage. And a type management unit that manages that the type of the second electronic device is acquired from the second electronic device by a predetermined communication unit in association with at least one predetermined voltage value, When the control means has a voltage value of the input voltage other than the predetermined voltage value based on the voltage value of the input voltage and the management content of the type management means, the voltage value of the input voltage is sent to the type management means. Managed in association with The second electronic device is determined by the predetermined communication means from the second electronic device when the type of the input voltage is determined as the type of the second electronic device and the voltage value of the input voltage is the predetermined voltage value. And the second electronic device includes a type transmitting unit that transmits the type of the second electronic device to the control unit when the voltage value of the input voltage is the predetermined voltage value. .

  In a preferred embodiment, there are a plurality of types of the second electronic device in which the voltage value of the input voltage becomes the predetermined voltage value.

  A device type determination device according to another preferred embodiment of the present invention is a device type determination device that determines the types of a plurality of types of second electronic devices connected to a first electronic device, and is connected to the device type determination device. Control means having an input terminal for changing the voltage value of the input voltage according to the type of the second electronic device, and first predetermined communication means from the second electronic device in association with the first predetermined voltage value To acquire the type of the second electronic device by the second predetermined communication means from the second electronic device in association with the second predetermined voltage value. Type management means for managing the effect, and the control means is configured such that the voltage value of the input voltage is the first predetermined voltage value based on the voltage value of the input voltage and the management content of the type management means. If present, before the second electronic device When the type of the second electronic device is acquired by a first predetermined communication means and the voltage value of the input voltage is the second predetermined voltage value, the second predetermined value is obtained from the second electronic device. The type of the second electronic device is acquired by communication means.

  Without increasing the number of input terminals of the control means, it is possible to determine the number of device types exceeding the number of voltage values that can be determined by the input terminals of the control means.

FIG. 2 is a diagram illustrating an AV amplifier 1 and an optional device 100A. It is a figure which shows AV amplifier 1 and optional equipment 100B. It is a figure which shows AV amplifier 1 and optional apparatus 100C. It is a figure which shows an apparatus classification table. 3 is a flowchart showing processing of the microcomputer 2; It is a figure which shows an apparatus classification table. It is a figure which shows an apparatus classification table. 3 is a flowchart showing processing of the microcomputer 2;

  Hereinafter, although the AV amplifier 1 to which the device type discrimination device according to the preferred embodiments of the present invention is applied will be described, the present invention is not limited to these embodiments. 1A to 1C are block diagrams showing an AV amplifier (first electronic device) 1 and a plurality of types of optional devices (second electronic devices) 100A to 100C.

  1, the AV amplifier 1 includes a microcomputer (control means) 2, a connector 3, an amplifier 4, and a resistance element R1. The connector 3 can be connected to connectors of a plurality of types of option devices 100A to 100C. The amplifier 4 amplifies the audio signal input from the optional devices 100A to 100C via the connector, and reproduces the audio from the speaker 300 connected to the outside.

  FIG. 1A shows a state where the AV amplifier 1 is connected to the optional device 100A. FIG. 1B shows a state where the AV amplifier 1 is connected to the optional device 100B. FIG. 1C shows a state where the AV amplifier 1 is connected to the optional device 100C. The optional device 100A includes a microcomputer 102A, a connector 103A, and a resistance element R2. The optional device 100B includes a microcomputer 102B, a connector 103B, and a resistance element R3. The optional device 100C includes a microcomputer 102C, a connector 103C, and a resistance element R3. The optional device 100A is, for example, a charger (cradle) for a portable audio player (DAP), the optional device 100B is an HD radio tuner, and the optional device 100C is a DAB tuner. Note that configurations (tuner circuits and the like) that are not related to the present invention in the optional devices 100A to 100C are omitted. Any of the connectors 103 </ b> A to 103 </ b> C can be connected to the connector 3 of the AV amplifier 1.

  In this example, the AV amplifier 1 can discriminate the number of types of second electronic devices that exceed the number of voltage values that can be discriminated in the AD port 2a described later. For example, although not shown, the AV amplifier 1 can discriminate six types of option devices 100D, 100E, 100F, 100G, 100H, and 100I in addition to the option devices 100A to 100C. That is, the microcomputer 2 can discriminate nine types of optional devices 100A to 100I even though the resolution of the AD port 2a is 8 levels. The optional devices 100A, 100D to 100I have resistance elements having different resistance values, and when these are connected to the AV amplifier 1, voltages having different voltage values (other than a predetermined voltage value) are applied to the AD port 2a. Entered. The optional devices 100B and 100C have resistance elements having the same resistance value. When these are connected to the AV amplifier 1, a voltage having the same voltage value (predetermined voltage value) is input to the AD port 2a.

  The microcomputer 2 of the AV amplifier 1 has an AD port 2a. When an optional device is connected, the input voltage input to the AD port is AD (analog-digital) converted, and the connector 3 is based on the AD value. The type of the optional device connected to is determined. The AD port 2a is not particularly limited, but has an 8-stage resolution, and can discriminate eight AD values.

  The microcomputer 2 stores a device type table shown in FIG. 2 in a built-in or connected memory. The device type table is a table for managing the types of optional devices in association with the AD value (voltage value) of the input voltage input to the AD port 2a. In FIG. 2, seven types of option devices 100A and 100D to 100I are managed for AD value 2 to AD value 8. The AD value 1 (predetermined voltage value) is determined by the microcomputer 2 acquiring type information from the optional device using a predetermined communication means (in this example, UART (Universal Asynchronous Receiver Transmitter) communication) with the optional device. Represents what to do.

  The AD port 2a is supplied with a predetermined voltage Va via the resistance element R1 and is connected to the connector 3. As shown in FIG. 1A, in the state where the optional device 100A is connected, the AD port 2a is connected to the predetermined voltage Va via the resistor element R1, and the connector 3, the connector 103A of the option device 100A, and the resistor element It is connected to the ground potential via R2. Accordingly, the AD port 2a receives a voltage value (Va × R2 / (R1 + R2)) obtained by dividing the predetermined voltage Va by the resistance elements R1 and R2 as the AD value 2. The microcomputer 2 determines that the type (option device 100A) managed in association with the AD value 2 is the type of the connected option device by referring to the device type table.

  As shown in FIG. 1B, in a state where the optional device 100B is connected, the AD port 2a is connected to the predetermined voltage Va via the resistor element R1, and the connector 3, the connector 103B of the option device 100B, and the resistor element It is connected to the ground potential via R3. Therefore, the AD port 2a receives a voltage value (Va × R3 / (R1 + R3)) obtained by dividing the predetermined voltage Va by the resistance elements R1 and R3 as the AD value 1. By referring to the device type table, the microcomputer 2 determines that the type of the optional device corresponding to the AD value 1 is acquired from the optional device by UART communication with the optional device.

  As shown in FIG. 1C, in a state where the optional device 100C is connected, the AD port 2a is connected to the predetermined voltage Va via the resistor element R1, and the connector 3, the connector 103C of the option device 100C, and the resistor element It is connected to the ground potential via R3. Therefore, the AD port 2a receives a voltage value (Va × R3 / (R1 + R3)) obtained by dividing the predetermined voltage Va by the resistance elements R1 and R3 as the AD value 1. By referring to the device type table, the microcomputer 1 determines that the type of the optional device corresponding to the AD value 1 is acquired from the optional device by UART communication with the optional device.

  The resistance values of the resistance elements included in the optional devices 100B and 100C are both R3. When the optional device 100B or 100C is connected to the AV amplifier 1, a voltage of AD value 1 is input to the AD port 2a. Therefore, the microcomputer 2 acquires the type from the optional device by UART communication and determines the type. Although not illustrated, when the optional devices 100D to 100I are connected to the AV amplifier 1, the AD value of the voltage input to the AD port 2a becomes the AD value 3 to the AD value 8, so the device type table is displayed. Referring to it, it is determined that the type is optional device 100D-100I.

  The microcomputer 2 is connected to the connector 3 via two UART lines (transmission side and reception side). Similarly, the microcomputers 102A to 102C of the optional devices 100A to 100C are connected to the connectors 103A to 103C via two UART lines (transmission side and reception side), respectively. Therefore, when the optional devices 100A to 100C are connected to the AV amplifier 1, the microcomputer 2 of the AV amplifier 1 is connected to the microcomputers 102A to 102C of the optional devices 100A to 100C via the two UART lines.

  FIG. 3 is a flowchart showing device type determination processing of the microcomputer 2 of the AV amplifier 1. The microcomputer 2 monitors whether the optional device 100 is connected to the AV amplifier 1 (S1). For example, whether or not an optional device is connected may be determined by providing a connection detection port in the microcomputer 2 and inputting a signal from the optional device 100 to the connection detection port when the optional device 100 is connected.

  When the optional device 100 is connected (YES in S1), the microcomputer 2 performs AD conversion on the voltage input to the AD port 2a and acquires an AD value (S2). The microcomputer 2 specifies the device type corresponding to the acquired AD value with reference to the device type table (S3). For example, when the AD value is 2, it is specified that the type of the connected optional device is the optional device 100A, and when the AD value is 3, the type of the connected optional device is the optional device 100D. It is specified that there is.

  The microcomputer 2 determines whether it is necessary to determine the type of the option device by UART communication with the option device (S4). That is, it is determined whether or not the AD value acquired in S2 is the AD value 1. If the AD value is not AD value 1 (NO in S4), the type can be determined only by the management content of the device type table, so the process proceeds to S6, and the process corresponding to the determined type is executed. And UART communication is started (S6).

  If the AD value is AD value 1 (YES in S4), the microcomputer 2 transmits a device type request command to the optional device 100B or 100C microcomputer 102B or 102C via the UART line (S5). In response to this request, the microcomputer 102B or 102C of the optional device 100B or 100C sends information about its own device type registered in advance in a memory built in or connected to the microcomputer 2 via the UART line. Send to. Although not particularly limited, for example, information about whether or not the optional device 102B is one bit out of 8-bit data transmitted by UART communication (1 if 102B, 0 if not), other 1 Information on whether or not the device is the optional device 102C (1 if 102C, 0 if not) may be included in the bit.

  The microcomputer 2 specifies the type of the connected optional device by receiving the device type information from the microcomputer of the optional device 100B or 100C (S5). After that, the microcomputer 2 executes processing according to the determined device type, and then starts communication with the optional device 100 by UART (S6).

  As described above, according to the present embodiment, the device type is determined based on the AD value of the voltage input to the AD port 2a, and if the AD value is a predetermined voltage value (AD value 1), the UART Since the device type information is acquired from the optional device by communication, it is possible to determine the number of device types greater than the number of voltage values that can be determined by the AD port 2a. For example, in the above embodiment, when including type information for each bit of 8-bit data transmitted / received by UART communication, 7 types are discriminated by AD value, 8 types are discriminated by UART, and a total of 15 types are discriminated. become able to.

  Note that it is possible to shorten the time until the classification is completed, rather than acquiring the type information by UART communication, by determining the type from the AD value with reference to the device type table. Accordingly, although not particularly limited, the type of an optional device that is generally considered to be frequently used by a user is set so as to be discriminated by an AD value, and the type of an optional device that is considered to be less frequently used is classified by UART communication. It is good to set to get.

  Further, in order to acquire the device type information from the optional device, not only UART communication but also other conventional methods such as I2C communication can be used. For example, as shown in FIG. 4, when the AD value is another predetermined voltage value (AD value 8), information on the device type may be acquired from the option device by I2C communication.

  Further, as shown in FIG. 5, the type of option device is not registered in association with the AD value in the device type table, and the type information is acquired from the option device by a predetermined communication means in association with the AD value. Thus, only the determination of the type may be managed. Specifically, in the case of AD value 1, it is managed to determine the type by acquiring the type information from the option device by UART communication. In the case of AD value 2, the type is determined from the option device by I2C communication. It is managed to acquire information and determine the type.

  FIG. 6 is a flowchart showing processing of the microcomputer 2 when the device type table of FIG. 5 is used. When the optional device is connected (YES in S11), the microcomputer 2 performs AD conversion on the voltage input to the AD port 2a and acquires an AD value (S12). The microcomputer 2 refers to the device type table in FIG. 5 and identifies a predetermined communication method corresponding to the acquired AD value. If the AD value is AD value 1, the microcomputer 2 determines that it is necessary to determine the type by acquiring the type information from the option device by UART communication (YES in S13). Therefore, the microcomputer 2 acquires the type information from the option device by UART communication and determines the type (S14). On the other hand, when the AD value is AD value 2, the microcomputer 2 determines that it is necessary to acquire the type information from the option device by I2C communication and determine the type (NO in S13). Therefore, the microcomputer 2 acquires the type information from the option device by I2C communication and determines the type (S15).

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment. By allowing a certain range of errors in the AD values registered in the device type table, it is possible to determine the formal type even if there is a slight error in the input voltage. The program may be provided in the form of a program for causing a computer to execute the above operation of the device type determination device and a recording medium on which the program is recorded.

  The present invention can be suitably employed in an AV amplifier or the like.

1 AV amplifier 2 Microcomputer 3 Connector 100A to 100C Optional equipment 102A to 102C Microcomputer 103A to 103C Connector

Claims (6)

A device type determination device for determining a type of a plurality of types of second electronic devices connected to the first electronic device,
Control means having an input terminal for changing the voltage value of the input voltage according to the type of the second electronic device to be connected;
The type of the second electronic device is managed in association with the voltage value of the input voltage, and the second electronic device is associated with at least one predetermined voltage value by the predetermined communication means from the second electronic device. A type management means for managing the acquisition of the type of electronic device,
When the control means is based on the voltage value of the input voltage and the management content of the type management means, if the voltage value of the input voltage is other than the predetermined voltage value, the voltage of the input voltage is sent to the type management means. When the type managed in association with the value is determined as the type of the second electronic device, and the voltage value of the input voltage is the predetermined voltage value, the second electronic device performs predetermined communication. A device type determination device that acquires the type of the second electronic device by means. A device type determination program for determining a type of a plurality of types of second electronic devices connected to the first electronic device,
Determining whether or not the voltage value of the input voltage is a predetermined voltage value in the control means having an input terminal that changes the voltage value of the input voltage according to the type of the second electronic device to be connected; ,
When the voltage value of the input voltage is other than the predetermined voltage value, determining the type managed in association with the voltage value of the input voltage in the type management means as the type of the second electronic device;
When the voltage value of the input voltage is the predetermined voltage value, a device type determination program for causing a computer to execute the step of acquiring the type of the second electronic device from the second electronic device by a predetermined communication means . A first electronic device, and a plurality of types of second electronic devices connected to the first electronic device,
Control means having an input terminal that changes a voltage value of an input voltage according to a type of the second electronic device to which the first electronic device is connected;
The type of the second electronic device is managed in association with the voltage value of the input voltage, and the second electronic device is associated with at least one predetermined voltage value from the second electronic device by predetermined communication means. A type management means for managing the acquisition of the type of electronic device,
When the control means determines that the voltage value of the input voltage is other than the predetermined voltage value based on the voltage value of the input voltage and the management content of the type management means, the voltage of the input voltage is sent to the type management means. When the type managed in association with the value is determined as the type of the second electronic device and the voltage value of the input voltage is the predetermined voltage value, the second electronic device performs predetermined communication. Obtaining the type of the second electronic device by means;
When the second electronic device has a voltage value of the input voltage equal to the predetermined voltage value, the device type determination system includes a type transmission unit that transmits the type of the second electronic device to the control unit.   The device type determination system according to claim 3, wherein there are a plurality of types of the second electronic device in which the voltage value of the input voltage is the predetermined voltage value.   5. The second electronic device applied to the device type discrimination system according to claim 3, wherein when the voltage value of the input voltage is the predetermined voltage value, the second electronic device is applied to the control unit. A second electronic device comprising a type transmitting means for transmitting the type of the electronic device. A device type determination device for determining a type of a plurality of types of second electronic devices connected to the first electronic device,
Control means having an input terminal for changing the voltage value of the input voltage according to the type of the second electronic device to be connected;
The type of the second electronic device is acquired by the first predetermined communication means from the second electronic device in association with the first predetermined voltage value, and the first in correspondence with the second predetermined voltage value. A type management unit that manages that the type of the second electronic device is acquired from the second electronic device by a second predetermined communication unit;
When the voltage value of the input voltage is the first predetermined voltage value based on the voltage value of the input voltage and the management content of the type management unit, the control unit is connected to the first electronic device from the second electronic device. If the type of the second electronic device is acquired by one predetermined communication means, and the voltage value of the input voltage is the second predetermined voltage value, the second predetermined communication from the second electronic device. A device type determination device that acquires the type of the second electronic device by means.

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