JPS61105998A - Acoustic device - Google Patents

Abstract

PURPOSE:To decrease the number of lines in bus and to reduce noise and inter- line shorting by providing a common operating unit, an audio unit and a display unit for multiple source units for a vehicle etc. and providing IFC line for interface clearing. CONSTITUTION:The operating unit 1, display unit 2, deck unit 4, tuner unit 4 and audio unit 5 are connected with one another so that mutual communications can be made. When data communications are made between the units, it is necessary to reset the hardware and clear the interface. For this reason, using two lines, RST and RXEN in the common bus 6 between the operating unit 1 and other unit X, signals are sent to the RST and RXEN lines at the timing as shown by the figure. That is, the RXEN line sends nor mally the signal to indicate whether data can be put on the data line or not, but by sending the signal (b) or (c) when the RST line is rising to the H level, it selects the hardware resetting or interface clearing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention provides a plurality of source units, an operation unit having a common operation input means for the plurality of source units, and an operation unit that inputs audio from the plurality of source units. An audio unit that selectively processes signals, and a display unit that displays operating states of the plurality of source units and the audio unit in a time-sharing manner, and the units are coupled by a bus means so as to be able to communicate with each other. This invention relates to audio equipment.

The recent development of car audio has been remarkable, and a large number of source (sound source) units are now being installed. However, since the living space of a car is limited and very narrow, it is impossible to bring devices that each have an operation input section and a display section into the car. Therefore, it has become possible to enable multiple source units to share an operation input section and a display.

[Technical background of the invention and its problems]

In a conventional device of this type, a bus interconnecting the units with communication signals was constructed as shown in FIG. In the figure, DATA is a data line, to which the data input port Sl of each unit is connected via a resistor, and the data output port SO of each unit is connected via a resistor and an inverter transistor, respectively. scK is a shift clock line for synchronization, RXEN is a line busy signal line to notify whether data can be loaded on the data line, SRQ is a service request line to request data transmission, and TX/RX is to notify whether transmission is in progress. This signal line is used to detect the end of data communication. R3T 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 above bus is connected to a power supply via a resistor and pulled up.

Although the above-mentioned lines are bundled into a single cable and the entire cable is shielded, noise is generated at the connector section 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 essential especially for in-vehicle devices.

Furthermore, in in-vehicle devices, short circuits between lines can lead to serious accidents such as vehicle flames, so from this point of view as well, it is required to reduce the number of lines as much as possible.

[Purpose of the invention]

An object of the present invention is to provide an audio device particularly suitable for use in a vehicle, which reduces noise and short circuits between lines by reducing the number of lines in a bus compared to the conventional device described above.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In the figure, 1 is an operation unit, 2 is a display unit, and 3
4 is a deck unit as a source unit, 4 is a tuner unit as another source unit, and 5 is an audio unit. These units are connected via a common hub 6 so that they can communicate with each other.

The operation unit 1 is connected to a common bus 6, and is connected to a screen selection key 11 for specifying a screen to be displayed on the display unit 2, a screen switching command generation circuit 12 for generating a screen switching command to the display unit 2, and a data a shift register 13 that performs input/output, a dual-purpose operation button section 14 that instructs operations to the deck unit 3, tuner unit 4, and audio unit 5, and an operation command generation circuit that generates operation commands for the target units. 15 and
It has a status decoder 16 for decoding status codes from units 3-5.

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

The deck unit 3 includes a shift register 31 that is connected to the common bus 6 and performs input/output of data, and an operation command decoder 3 that decodes operation commands from the operation unit 1.
2, a deck mechanism 33 that plays back the set cassette, a deck mechanism controller 34 that controls the deck mechanism using decoded operation commands and monitors its status, and a deck mechanism controller 34 that outputs a status code according to the status of the deck mechanism. It has a status command generation circuit 35 that generates a status command, and a display data generation circuit 36 that generates display data regarding the status of the deck mechanism.

The tuner unit 4 includes a shift register 41 that is connected to a common lotus 6 and inputs and outputs data, an operation command decoder 42 that decodes operation commands from the operation unit 1, and a tuner unit 4 that selects a desired station from the radio waves received by the antenna 7. A tuner 43 that selects and detects a wave, a tuner controller 44 that controls the tuner 43 using decoded operation commands and monitors its status, and a status code generation circuit 45 that generates a status code according to the status of the tuner 43. The display data generating circuit 46 generates display data regarding the state of the tuner 43.

The audio unit 5 includes a shift register 51 that is connected to the common bus 6 and performs data input/output, and an operation unit 1.
an operation command decoder 52 that decodes operation commands from the deck unit 3 and the tuner unit 4; an audio circuit 54 that processes audio signals from the deck unit 3 and tuner unit 4 and also has a graphical echo function; and an audio circuit 54 that amplifies the power of the audio signal from the audio circuit 53 A power amplifier 54 that supplies the speaker 8, an audio amount controller 55 that controls the audio circuit 53 using decoded operation commands, a display data creation circuit 56 that creates display data regarding the control state by the audio amount controller 55, It has a status code generation circuit 57 that generates a status code depending on the state of the circuit 53 and the like.

In the above configuration, when the deck selection key included in 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 A signal is sent to the display unit 2 to send a deck display command to the display unit 2 through the shift register 13. The screen switching command is sent from the screen switching command generating circuit 12 to the display screen switching command decoder 26 via the shift register 25, and is decoded here to select the display data buffer 22.

This selection allows the display data from the deck unit 3 to be sent to the display 21.

After the operation command generation circuit 15 causes the screen switching command generation circuit 12 to send out a screen switching command, it sends a command to the audio unit 5 indicating that the operating unit/nod is in the correct position through the shift register 13, and the audio unit 5 Wait for the status code indicating completion of reception.

The operation on command is passed through a shift register 51, decoded by an operation command decoder 52, and input to an audio amount controller 55.

The controller 55 sets the volume of the audio circuit 53 to a value preset for the deck unit 3 and causes the audio circuit 53 to amplify the audio signal. The audio signal amplified by the audio circuit 53 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 operating unit 1 receives the status code from the audio unit 5 through a shift register 13 and a status decoder 16. The status decoder 16 that has decoded the status code gives an instruction to the operation command generation circuit 12 to send out a deck operation start command. This deck operation start command is sent to the deck unit 3 through the shift register 13.

The decking unit 3 receives the decking operation start command through a shift register 31 and decodes it with an operation command decoder 32. The deck mechanism controller 34 receives and receives the start signal generated by this decoding from the decoder 32, operates the deck mechanism 33, and
After the status code generating circuit 35 generates and sends a status code indicating that the command has been accepted as valid, the display data generating circuit 36 generates data indicating the current operating state of the deck, and shifts this. It is transferred to the display unit 2 through the register 31.

For example, when the deck is in operation, the FF in the dual-purpose operation button section 14 is pressed.
When a 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 a shift register 31 and decodes it with an operation command decoder 32. Based on this decoded command, the decking mechanism controller 34 controls the decking mechanism to bring it into a fast forward state. The controller 34 also causes the status code generation circuit 35 to send a valid status code for the FF command to the operating unit 1, and then sends the FF command of the deck.
F state display data is sent from the display data creation circuit 36 to the display unit 2.

The audio unit 5 has functions such as graeco. To operate Graeco, press 11 screen designation key 1
Operate 1 to specify Graeco.

In response, 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 through the shift register 25 to the display screen command decoder 26, where it is decoded.

In response to this decoded command, display data is output from the display data buffer (audio) 24 to the display 21. Then, data from the audio unit 5 is set in the display data buffer (audio) 24 through the shift register 25.

Thereafter, when a graphic operation is performed using the dual-purpose operation button section 14, the operation command trick generation circuit 12 sends a graphic operation command to the audio unit 5 through the shift register 13. This command is passed through a shift register 51 and decoded by an operation command decoder 52.

This decoded command provides an instruction regarding the graeco operation to the audio amount controller 55. The controller 55 receives the above instruction and causes the audio circuit 53 to correct the audio signal. The controller 55 also causes the display data creation circuit 56 to send the current graphical display data to the display unit 2 through the shift register 51.

In order to return the graphic display to the deck information display, it is sufficient to specify the deck screen using the screen designation key 11, and in response to this instruction, the screen switching command generation circuit 12 outputs a deck screen instruction command to the display unit 2.

However, in consideration of operability in the car, when an operation key such as REW for the deck is operated on the dual-purpose operation button part 14 during the graphic display, the operation command generation circuit 12 is sent to the deck unit 3 through the shift register 13.
When the REW command is sent to the display unit 3 and a valid status code for the above command is received from the deck unit 3, the screen switching command generation circuit 12 automatically
The display unit 2 is configured to send a deck display command to the display unit 2.

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

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

In addition, the data of the above status code is input key valid/
Information such as invalidity information and operation completion is assigned to predetermined bits.

As described above, when performing data communication between units using the common bus 6, it is necessary to reset the hardware and clear the interface.

In order to do this, the device according to the invention uses two lines, the R3T line and the RXEN line, in the common bus 6 between the operating unit l and the other unit X, as shown in FIG.
Signals are sent to the R3T and RXEN lines at the timing shown in FIG.

That is, the RXEN line normally sends out a signal indicating whether data is loaded onto the data line, but when the R5T line rises to the H level as shown in FIG. 3(a), the signal shown in FIG. By sending out a signal as shown in C1, the reset line signal is used for the original hard reset and interface clear.

More specifically, when the interface is cleared, the RX E N line is held at the L level for a time t' even after the reset is released, and when the hard reset is performed, it is kept at the H level. This allows each unit to distinguish between a hard reset and an interface clear by detecting the RXEN line after a period of time after the reset is released.

Furthermore, I! The relationship between t and t' is t<t'.

To achieve the above, as shown in Figure 2, interface clear (IFC) of the receiving unit is the AND of R3T and RXEN, and reset (R3T) is the logical product of R3T.
The logical product of T and RX E N is input.

〔Effect of the invention〕

As explained above, according to the present invention, both the hard reset and the interface clear can be performed by combining the timing of the signals sent to the hard reset line in the common bus and the lines normally having other functions. Therefore, the IFC line that was conventionally provided exclusively for interface clearing can be omitted, and the number of lines in the bus can be reduced accordingly.

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

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the device according to the present invention, FIG. 2 is a diagram showing the main part of the lotus configuration in the device according to the present invention, and FIG. 3 is the signal of the R3T and RXEN lines in FIG. FIG. 4 is a timing chart diagram and a wiring diagram showing a lotus configuration of a conventional device. 1...Operation-L-Soto, 2...Display unit, 3...Deck unit, 4...
- Tuner unit, 5... Audio unit, 6... Common lotus.

Claims (1)

[Claims] a plurality of source units; an operation unit having common operation input means for the plurality of source units; an audio unit that selectively processes audio signals from the plurality of source units; A display unit that displays the operating status of the audio unit in a time-sharing manner, and an audio device in which the units are coupled by a bus means so as to be able to communicate with each other. a means for selecting a timing combination of signals sent to the two lines using two lines having functions; and a means for determining the timing combination and interfacing the signal sent to the reset line with a hard reset. A sound device characterized by comprising a means for selectively using it for clear and clear sounds.