JP3759575B2 - Multi-spec electronic equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention sets in advance one or a plurality of functions necessary for realizing all specifications in order to set different specifications depending on the destination in various electronic devices such as audio equipment. The present invention relates to a multi-specification type electronic apparatus configured to enable necessary functions each time while disabling unnecessary functions.
[0002]
[Prior art]
Conventionally, an audio device capable of receiving a broadcast wave by an FM multiplex broadcasting system called RDS (Radio Data System) is known. In this type of audio device, the country where RDS is introduced and the RDS It is necessary to change the specifications depending on the country that has not been introduced.
That is, in an audio device destined for a country where RDS is introduced, an RDS data extraction circuit (50) is provided in the tuner unit (10) as shown in FIG. 4, and a micro that controls the operation of the tuner unit (10) is provided. The computer (20) has a key input receiving function and a data display function (hereinafter referred to as a data processing function) for displaying data obtained from the RDS data extraction circuit (50) of the tuner unit (10) on a display (not shown). (Generic name) must be set.
On the other hand, in an audio device destined for a country where RDS is not introduced, the tuner unit (10) does not need to be equipped with an RDS data extraction circuit (50), and the microcomputer (20) includes the data processing function. There is no need to set.
[0003]
However, although it is easy to omit unnecessary circuits such as the RDS data extraction circuit (50) from the tuner unit (10), the microcomputer (20) is operated by a series of computer programs. It is difficult to omit only the data processing function.
Therefore, conventionally, as shown in FIG. 4, the microcomputer (20) is provided with a plurality of specification selection terminals (21) corresponding to a plurality of specifications including RDS compatible / non-compatible specifications and recognizes the selected specifications. A selection input terminal (23) is provided, and the specification selection terminal (21) for the specification to be supported according to the destination is connected to the selection input terminal (23) via a diode (22), thereby Among a plurality of data processing functions set in advance in the computer (20), necessary data processing functions are validated, and unnecessary data processing functions are invalidated.
[0004]
[Problems to be solved by the invention]
However, in the specification correspondence system using the specification selection terminal (21), the diode (22) and the selection input terminal (23) shown in FIG. 4, one or a plurality of diodes (22) are required, and the apparatus configuration is complicated. As well as the microcomputer (20), the number and position of the diodes (22) to be mounted on the printed circuit board vary from destination to destination, which increases the number of types of printed circuit boards and complicates the manufacturing process. was there.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic device that can support a plurality of specifications without complicating the apparatus configuration and the manufacturing process.
[0006]
[Means for Solving the Problems]
The multi-spec electronic device according to the present invention is configured by connecting a first circuit unit and a second circuit unit so that they can communicate with each other, and the first circuit unit receives a broadcast signal as a main circuit. A data extraction circuit for extracting data multiplexed in a broadcast signal can be selectively provided to the main circuit as an auxiliary circuit. The second circuit unit includes at least a microcomputer that controls the operation of the PLL circuit, and the microcomputer has a data processing function for processing data extracted from a broadcast signal, and the first circuit In an electronic device capable of supporting a plurality of specifications by selecting and setting a necessary data processing function according to the data extraction circuit actually installed in the unit, The microcomputer includes signal transmission means for transmitting a signal for detecting the presence or absence of the data extraction circuit to the PLL circuit, and the PLL circuit that has received the signal transmitted from the signal transmission means includes the data extraction circuit The microcomputer outputs a signal indicating the presence or absence of the data extraction circuit from the microcomputer, and the microcomputer recognizes the data extraction circuit provided in the first circuit unit according to the output signal, and The data processing function for the data extraction circuit equipped in the first circuit unit is validated, while the data processing function for the data extraction circuit not equipped in the first circuit unit is invalidated.
[0007]
In the multi-spec electronic device of the present invention, for example, depending on the destination, a specification in which the first circuit unit is equipped with a data extraction circuit and a specification in which the first circuit unit is not equipped with a data extraction circuit However, the microcomputer of the second circuit section is preset with a data processing function required by the equipment of the data extraction circuit regardless of the destination, that is, regardless of the presence or absence of the data extraction circuit. .
[0008]
For convenience of explanation, assuming that there is one data extraction circuit to be provided in the first circuit, the signal transmission means in the microcomputer provided with the second circuit section after the electronic device of the present invention is turned on Transmits a signal for detecting the presence or absence of the data extraction circuit to the PLL circuit of the first circuit unit. In response to this, the PLL circuit of the first circuit unit causes the data extraction circuit to transmit different signals to the microcomputer of the second circuit unit depending on the presence or absence of the data extraction circuit. The microcomputer of the second circuit section that has received the signal recognizes the presence and type of the data extraction circuit based on the signal, and when the data extraction circuit is equipped, the data processing corresponding to the data extraction circuit While the function is enabled, the data processing function is disabled when the data extraction circuit is not provided.
[0009]
In a specific configuration, broadcast signals received by the reception circuit are AM band and FM band broadcast signals, and data extracted from the broadcast signal by the data extraction circuit is data multiplexed on FM multiplex broadcast waves, The signal transmission means constituted by a microcomputer transmits a signal for setting an AM band to the PLL circuit after power-on, and activates a data processing function according to the output level of the data output terminal of the data extraction circuit Enable or disable.
The second circuit section includes a display for displaying data extracted from the FM multiplex broadcast wave, and the data processing function set in the microcomputer displays the data extracted from the FM multiplex broadcast on the display. It is a function.
[0010]
The data output terminal (53) of the data extraction circuit (5) is connected to the data input terminal (71) of the microcomputer (7) and to the power supply via the pull-up resistor (6). The microcomputer (7) validates the data processing function when the data input terminal (71) is at the high level, and invalidates the data processing function when the data input terminal (71) is at the low level.
[0011]
Further, the data extraction circuit (5) is opened when the PLL circuit (4) is set to the AM band and the input terminal (52) of the signal becomes high, and when the input terminal (52) becomes high. And a data output terminal (53).
[0012]
In the above specific configuration, when the data extraction circuit is provided in the first circuit unit, the microcomputer of the second circuit unit first sets the AM band to the PLL circuit of the first circuit unit when the power is turned on. Send a signal for. The PLL circuit receives the signal and inputs a high signal to the input terminal of the data extraction circuit. In response to this, the data output terminal of the data extraction circuit is opened. Here, since the data output terminal is pulled up to a high level, high level data is input to the data input terminal of the microcomputer of the second circuit section. As a result, the microcomputer data The processing function is activated.
[0013]
On the other hand, when the data extraction circuit is not provided in the first circuit unit, the microcomputer of the second circuit unit sends a signal for setting the AM band to the PLL circuit of the first circuit unit when the power is turned on. Although the data extraction circuit is not provided in the first circuit unit, the data input terminal of the microcomputer in the second circuit unit is at a low level without being pulled up. Data processing function is disabled.
[0014]
【The invention's effect】
According to the multiple specification compatible electronic device according to the present invention, the specification selection terminal, the selection input terminal, and the diode provided in the multiple specification compatible electronic device capable of receiving the broadcast wave by the conventional multiplex broadcasting system are unnecessary. Therefore, the data processing function for processing the data extracted from the broadcast signal can be validated and invalidated without complicating the apparatus configuration and the manufacturing process.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention applied to an RDS-compatible audio device will be described in detail with reference to the drawings.
As shown in FIGS. 1 and 2, an audio device according to the present invention includes a tuner unit (1) capable of receiving FM multiplex broadcasting and a control unit (2) for controlling the operation of the tuner unit (1). The tuner section (1) is equipped with a receiving circuit (3) and a PLL circuit (4), and the control section (2) is equipped with a microcomputer (7) and a display (8).
[0016]
Depending on the destination, the tuner unit (1) is equipped with an RDS data extraction circuit (5) as shown in FIG. 1 (RDS compatible specification), and the tuner unit (1) as shown in FIG. Some are not equipped with an extraction circuit (RDS non-compliant specification).
However, a data processing function for displaying RDS data on the display (8) is set in advance in the microcomputer (7) regardless of the destination.
[0017]
The receiving circuit (3) of the tuner unit (1) includes a front end unit, an intermediate frequency amplifying unit, an FM detection circuit, and the like, and is used for switching the receiving frequency between the FM band and the AM band in accordance with a user operation. An FM / AM switching terminal (31), an audio output terminal (32) for outputting an audio signal to a subsequent speaker (not shown), and a multiplex signal output terminal (33) for outputting an FM multiplexed signal are provided. .
The PLL circuit (4) has an AM band on terminal (41) which becomes high when the AM band is set by the control of the microcomputer (7) of the control unit (2).
[0018]
Further, the RDS data extraction circuit (5) has a multiplex signal input terminal (51) to which an FM multiplex signal is input and a high (“1”) to stop crystal oscillation of the RDS data extraction circuit (5) when the AM band is set. ”) A test input terminal (52) to which a standby control signal should be input, and an RDS data output terminal (53) for outputting RDS data extracted from the FM multiplexed signal, and an RDS data output terminal (53). Is connected to the power supply Vcc through a pull-up resistor (6).
Furthermore, the microcomputer (7) of the control unit (2) has an RDS data input terminal (71) to which RDS data is to be input.
[0019]
The multiplex signal output terminal (33) of the receiving circuit (3) is connected to the multiplex signal input terminal (51) of the RDS data extraction circuit (5), and the AM band on terminal (41) of the PLL circuit (4). Are connected to the FM / AM switching terminal (31) of the receiving circuit (3) and the test input terminal (52) of the RDS data extracting circuit (5).
The RDS data output terminal (53) of the RDS data extraction circuit (5) is connected to the RDS data input terminal (71) of the microcomputer (7).
As shown in FIG. 2, the RDS data input terminal (71) of the microcomputer (7) is grounded inside the tuner (1) when the tuner (1) is not equipped with an RDS data extraction circuit. ing.
[0020]
FIG. 3 shows a procedure executed by the microcomputer (7) when the power is turned on. First, in step S1, a control signal for setting the AM band is supplied to the PLL circuit (4) of the tuner unit (1). Thereafter, in step S2, it is determined whether or not the RDS data input terminal (71) has become high ("H").
[0021]
Here, when the tuner unit (1) is equipped with the RDS data extraction circuit (5) as shown in FIG. 1, the AM band on terminal (41) of the PLL circuit (4) becomes high, and the high data ("1") is input to the FM / AM switching terminal (31) of the receiving circuit (3) and the test input terminal (52) of the RDS data extracting circuit (5). In response to this, the RDS data extraction circuit (5) stops the crystal oscillation and sets the RDS data output terminal (53) to an open state.
As a result, the RDS data output terminal (53) becomes high level by pull-up, and high data is input to the RDS data input terminal (71) of the microcomputer (7).
[0022]
On the other hand, when the tuner unit (1) is not equipped with the RDS data extraction circuit as shown in FIG. 2, the AM band on terminal (41) of the PLL circuit (4) becomes high, and the high data is Although the signal is input to the FM / AM switching terminal (31) of the receiving circuit (3), the RDS data input terminal (71) of the microcomputer (7) is grounded and thus is kept low.
[0023]
Therefore, in step S2 of FIG. 3, it is determined whether or not the RDS data input terminal (71) is high ("H"). If the determination is YES, the process proceeds to step S3 to perform the RDS function. If NO is determined, the process proceeds to step S4 to disable the RDS function.
As a result, when the tuner unit (1) is equipped with the RDS data extraction circuit (5), the microcomputer (7) displays the RDS data obtained from the RDS data extraction circuit (5) on the display (8). When the tuner unit (1) is not equipped with an RDS data extraction circuit, the data processing for displaying the RDS data on the display (8) is omitted and the data display is performed. The key input receiving function and data display function are omitted.
[0024]
As described above, according to the audio device according to the present invention, the specification selection terminal, the selection input terminal, and the diode provided in the conventional device are not necessary, so that the RDS can be achieved without complicating the device configuration and the manufacturing process. It is possible to easily configure audio devices that are compatible and non-RDS compatible.
[0025]
In addition, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim. For example, in the above-described embodiment, the data processing function of the microcomputer (7) is enabled / disabled for two specifications of the RDS compatible specification and the non-RDS compatible specification, but the surround function is enabled / disabled. It is also possible to deal with more specifications including conversion.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration when an RDS data extraction circuit is provided in a tuner section in an audio device according to the present invention.
FIG. 2 is a block diagram showing a configuration when an RDS data extraction circuit is not installed in a tuner unit in an audio device according to the present invention.
FIG. 3 is a flowchart showing a control procedure of the microcomputer.
FIG. 4 is a block diagram showing the configuration of a conventional audio device.
[Explanation of symbols]
(1) Tuner
(2) Control part
(3) Receiver circuit
(31) FM / AM switching terminal
(32) Audio output terminal
(33) Multiplex signal output terminal
(4) PLL circuit
(41) AM band on terminal
(5) RDS data extraction circuit
(51) Multiplex signal input terminal
(52) Test input terminal
(53) RDS data output terminal
(6) Pull-up resistor
(7) Microcomputer
(71) RDS data input terminal
(8) Display

Claims (5)

The first circuit unit and the second circuit unit are configured to be communicably connected to each other,
The first circuit unit includes a reception circuit and a PLL circuit for receiving a broadcast signal as a main circuit, and a data extraction circuit for extracting data multiplexed in the broadcast signal as an auxiliary circuit as a main circuit. At least one can be selectively equipped,
The second circuit unit includes at least a microcomputer that controls the operation of the PLL circuit, and the microcomputer has a data processing function for processing data extracted from a broadcast signal, and the first circuit unit Depending on the data extraction circuit actually installed in the circuit unit, the necessary data processing function is selected and set,
In electronic devices that can support multiple specifications,
The microcomputer is
Comprising signal transmitting means for transmitting a signal for detecting the presence or absence of the data extraction circuit to the PLL circuit;
The PLL circuit that has received the signal transmitted from the signal transmission means causes the microcomputer to output a signal indicating the presence or absence of the data extraction circuit from the data extraction circuit,
In accordance with the output signal, the microcomputer recognizes the data extraction circuit provided in the first circuit unit, and performs a data processing function for the data extraction circuit provided in the first circuit unit. The multi-spec electronic device is characterized in that the data processing function for the data extraction circuit that is not provided in the first circuit unit is invalidated. Broadcast signals received by the reception circuit are AM band and FM band broadcast signals, and data extracted from the broadcast signal by the data extraction circuit is data multiplexed on FM multiplex broadcast waves,
The signal transmission means constituted by the microcomputer transmits a signal for setting an AM band to the PLL circuit after power is turned on, and a data processing function according to the output level of the data output terminal of the data extraction circuit The multi-spec electronic device according to claim 1, wherein the electronic device is enabled or disabled. The second circuit unit includes a display for displaying data extracted from the FM multiplex broadcast wave, and the data processing function set in the microcomputer displays the data extracted from the FM multiplex broadcast on the display. The multi-spec electronic device according to claim 2, which is a function for the purpose.   A data output terminal of the data extraction circuit is connected to a data input terminal of the microcomputer and connected to a power source through a pull-up resistor, and the microcomputer has a high level when the data input terminal is at a high level. 4. The multi-spec electronic device according to claim 2, wherein a data processing function is enabled and the data processing function is disabled when the data input terminal is at a low level.   The data extraction circuit comprises an input terminal for a signal that goes high when the PLL circuit is set to AM band, and a data output terminal that opens when the input terminal goes high. The electronic device corresponding to a plurality of specifications according to claim 2 or claim 3.

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