JPH0634552B2 - Audio equipment - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a plurality of source units, an operation unit provided with operation input means common to the plurality of source units, and an audio from the plurality of source units. An audio unit for selectively processing a signal, and a display unit for displaying the operating states of the plurality of source units and the audio unit in a time-division manner, and the units are communicably connected to each other by a bus means. The present invention relates to an audio device.

The recent development of car audio has been remarkable, and many source (sound source) units have been installed. However, since the living space of a car is limited and extremely narrow, it is impossible to bring a device having an operation input unit and a display unit into the car as it is. Therefore, it has come to be considered that the operation input unit and the display can be shared by a plurality of source units.

[Technical Background of the Invention and Problems Thereof] In the conventional apparatus of this type, the bus which communicably couples the units to each other is configured as shown in FIG.
In the figure, DATA is a data line, and the data input port SI of each unit is connected to the line via a resistor, and the data output port SO of each unit is connected to the line via a resistor and an inverter transistor. ▲ ▼ K is the shift clock line for synchronization, RX
EN is a line busy signal line, ▲ ▼ is a service request line for requesting data transmission, and ▲ ▼ / R
X is a signal line for notifying whether or not transmission is in progress, and this line is used to detect the end of data communication. RST is a hard reset line and IFC is an interface clear line. The above lines are connected to the corresponding ports of each unit. Each line of the bus is connected to the + power supply via a resistor and pulled up.

The above-mentioned lines are bundled and finished into one cable, and the whole is shielded. However, noise is generated in the connector portion that connects the bus and the unit. It is known that these noise sources can be reduced by reducing the number of lines in the bus, but this noise countermeasure is indispensable especially in a vehicle-mounted device.

Further, in a vehicle-mounted device, a short-circuit between lines or the like leads to a serious accident such as a vehicle flame. From this point as well, it is required to reduce the number of lines as much as possible.

[Object of the Invention]

It is an object of the present invention to provide an audio device particularly suitable for mounting on a vehicle, in which the number of lines in the bus is reduced as compared with the above-mentioned conventional one, thereby reducing noise and short-circuiting between lines.

Example of Invention

 An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is an operation unit, 2 is a display unit, 3
Is a deck unit as a source unit, 4 is a tuner unit as another source unit, and 5 is an audio unit, and these units are connected via a common bus 6 so that they can communicate with each other. The operation unit 1 is connected to a screen designating key 11 for designating a screen to be displayed on the display unit 2, a screen switching command generation circuit 12 for generating a screen switching command for the display unit 2, and a data connected to the common bus 6. Shift register 13 for inputting / outputting data, dual-purpose operation button section 14 for instructing the deck unit 3, tuner unit 4, and audio unit 5 to operate, and an operation command generating circuit for generating an operation command for the target unit. 15 and a status decoder 16 which decodes the status codes from the units 3 to 5.

The display unit 2 has a display 21 that selectively displays the operating states of the units 3 to 5 and a buffer 22 to 24 for display data from each of the deck unit 3, the tuner unit 4 and the deck unit 5 in common. It has a shift register 25 for receiving data from the bus 6 and a display screen switching command decoder 26 for coding a display screen switching command in the received data.

The deck unit 3 is connected to the common bus 6 for inputting / outputting data, and the operation command decoder 3 for decoding operation commands from the operation unit 1.
2, a deck mechanism 33 that reproduces the set cassette, a deck mechanism controller 34 that controls the deck mechanism by a decoded operation command and monitors the state, and a status code according to the state of the deck mechanism. It has a status command generation circuit 35 for generating and a display data generation circuit 36 for generating display data regarding the state of the deck mechanism.

The tuner unit 4 is connected to the common bus 6 for inputting / outputting data, an operation command decoder 42 for decoding an operation command from the operation unit 1, and a desired station from radio waves received by the antenna 7. A tuner 43 for selecting and detecting, a tuner controller 44 for controlling the tuner 43 by a decoded operation command and monitoring the state thereof, a status code generation circuit 45 for generating a status code according to the state of the tuner 43, and the like. And a display data creation circuit 46 for creating display data regarding the state of the tuner 43.

The audio unit 5 includes a shift register 51 that inputs and outputs data connected to the common bus 6, an operation command decoder 52 that decodes an operation command from the operation unit 1, a deck unit 3 and a tuner unit 4.
In addition to processing the audio signal from the audio circuit 54, an audio circuit 54 having a Graco's function, a power amplifier 54 for power-amplifying the audio signal from the audio circuit 53 and supplying it to the speaker 8, and an audio circuit 53 by a decoded operation command. An audio amount controller 55 for controlling, a display data creating circuit 56 for creating display data on a control state by the audio amount controller 55, and a status code generating circuit 57 for generating a status code according to the state of the audio circuit 53.
Have and.

In the above configuration, when the deck selection key of the dual-purpose operation button section 14 in the operation unit 1 is operated, the operation command generation circuit 15 creates an operation on command for the deck unit 3 and the screen switching command generation circuit 12 To send a deck display command to the display unit 2 through the shift register 13. A screen switching command is sent from the screen switching command generation circuit 12 to the display screen switching command decoder 26 through the shift register 25, and is decoded there to select the display data buffer 22. By this selection, the display data from the deck unit 3 is sent to the display 21.

The operation command generating circuit 15 causes the screen switching command generating circuit 12 to send a screen switching command, and then sends to the audio unit 5 a command indicating that the operating unit is a deck through the shift register 13 and receives from the audio unit 5. Wait for completion status code.

The operation ON command is decoded by the operation command decoder 52 through the shift register 51 and input to the audio amount controller 55. This controller 55
Sets the volume of the audio circuit 53 to a preset value for the deck unit 3 and causes the audio circuit 53 to amplify the audio signal. Audio circuit 53
The audio signal amplified by is then power-amplified by the power amplifier 54 and supplied to the speaker 8. The controller 55 also causes the status code generation circuit 57 to generate a status code indicating that the operation command is valid, and sends it to the operation unit 1 through the shift register 51.

The operation unit 1 receives the status code from the audio unit 5 at the status decoder 16 through the shift register 13. The status decoder 16 which has decoded the status code is the operation command generation circuit 1
An instruction to send a deck operation start command to 2 is given. This deck operation start command is sent to the deck unit 3 through the shift register 13.

The deck unit 3 receives the deck operation start command through the shift register 31 and decodes it by the operation command decoder 32. The deck mechanism controller 34 receiving the start signal generated by this decoding from the decoder 32 operates the deck mechanism 33, and
After the status code indicating that the command has been accepted as valid is generated and transmitted to the status code generation circuit 35, the data indicating the current operation state of the deck is generated in the display data generation circuit 36, and this is generated. Through the display unit 2.

For example, the FF in the dual-purpose operation button section 14 while the deck is operating
When the key is operated, an FF command is generated by the operation command generation circuit 15, and this is sent to the deck unit 3 through the shift register 13. The deck unit 3 receives this FF command through the shift register 31 and decodes it by the operation command decoder 32. Based on the decoded command, the deck mechanism controller 34 controls the deck mechanism to put it in the fast-forward state. The controller 34 also sends a valid status code for the FF command to the operation unit 1 from the status code generation circuit 35, and then the deck F
The F state display data is sent from the display data creating circuit 36 to the display unit 2.

The audio unit 5 has a function such as Graeco. To operate Graeco, screen designation key 11
Operate to specify Graeco. In response to this, the screen switching command generation circuit 12 sends an audio display command to the display unit 2 through the shift register 13. This command is sent to the display screen command decoder 26 through the shift register 25 and is decoded there. By this decoded command, display data is output from the display data buffer (audio) 24 to the display unit 21. Then, the data from the audio unit 5 is set in the display data buffer (audio) 24 through the shift register 25.

After that, when the Graeco operation is performed on the dual-purpose operation button unit 14, the operation command tip generation circuit 12 sends the Graeco operation command to the audio unit 5 through the shift register 13. This command is decoded by the operation command decoder 52 through the shift register 51. With this decoded command, an instruction regarding the gray scale operation is given by the audio amount controller 5.
Given to 5. In response to the instruction, the controller 55 causes the audio circuit 53 to correct the audio signal. The controller 55 also causes the display data creating circuit 56 to send the current Gracoe display data to the display unit 2 through the shift register 51.

To return the graphic display to the information display of the deck, it is sufficient to point the deck screen with the screen designation key 11, and the deck switching command circuit 12 outputs the deck screen command to the display unit 2 by this instruction.

However, in consideration of the operability in the vehicle, when an operation key such as REW for the deck is operated in the dual-purpose operation button portion 14 during the gray eco display, the operation command generation circuit 12 causes the deck unit 3 to operate through the shift register 13.
When a valid status code for the above command is received from the deck unit 3 when the REW command is sent to the screen switching command generation circuit 12
The deck display command is transmitted to the display unit 2.

By this operation, when the command generated by the user's operation is valid for the target unit, the operation state for the command can be confirmed without operating the screen switching key.

The same data transfer as described above is performed for the tuner unit 4 and the deck unit 5.

Also, the above status code data is valid for the input key /
Information such as invalid information and operation completion is assigned to predetermined bits and configured.

As described above, in order to perform data communication between the units using the common bus 6, one of the addresses 0 to 15 is assigned to each unit. In the transmission, as shown in FIG. 2, first, the addresses of the transmission side unit and the reception side unit are transmitted, and then the data length to be transmitted is represented by the number of bytes (n) and transmitted. After that data 1
The data n is sent, and when the data has been sent n bytes, the transmission ends. This operation of the transmission side unit is performed as shown in the flowchart of FIG.

On the other hand, upon reception, as shown in the flow chart in Fig. 3 (b), the receiving unit counts the number of data sent, and the count value becomes the number of data sent at the beginning of communication. The reception ends at the point where it is received.

〔The invention's effect〕

As described above, according to the present invention, the receiving side unit can receive all the data from the transmitting side even if the receiving side unit does not receive the signal indicating that the transmitting side unit is transmitting. Further, when all the data are received, the next operation can be started, and the signal line ▲ ▼ / RX which has been conventionally required can be omitted, and the number of lines in the bus can be reduced accordingly. it can.

This reduction in the number of bus lines not only makes it possible to reduce noise and short circuits between lines, but also simplifies the bus configuration, reduces the probability of incorrect connection, and reduces the cost of this line. .

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the device according to the present invention, FIG. 2 is a transmission data format in the device according to the present invention, and FIG. 3 is a flow chart diagram showing transmission / reception operation during data communication in the device according to the present invention, FIG. 4 and FIG. 4 are wiring diagrams showing the bus configuration of the conventional device. 1 ... Operation unit, 2 ... Display unit, 3 ... Deck unit, 4 ... Tuner unit, 5 ... Audio unit, 6 ... Common bus.

Claims (1)

[Claims] 1. A plurality of source units, an operation unit having an operation input means common to the plurality of source units, an audio unit for selectively processing audio signals from the plurality of source units, In an audio device comprising a plurality of source units and a display unit for displaying the operating states of the audio units in a time-division manner, the units being connected by bus means so that they can communicate with each other, each of the units is connected between the units. During the data communication, the audio device is provided with means for inserting information regarding the number of transferred data into the data and means for detecting the end of the data communication by using the information.