JP2933647B2 - Electronic equipment system - Google Patents

Description

The present invention relates to an electronic device system in which a plurality of electronic devices operate in synchronization.

2. Description of the Related Art There has been proposed an audio system including a tape deck, a CD (compact disk) player, an amplifier, and the like, which performs a so-called synchro operation in order to improve operability. The sync operation includes, for example, a CD auto function, a deck auto function, a CD sync recording, and the like.

In the CD auto function, when the CD player is set to the playback state, the amplifier function automatically changes to the CD function.
When the mode is switched to the player or the function of the amplifier is set to the CD player, the CD player automatically enters the reproducing state.

In the deck auto function, when the tape deck is set to the reproducing state, the function of the amplifier is automatically switched to the tape deck, or when the function of the amplifier is set to the tape deck, the tape deck is automatically set to the reproducing state.

In CD synchro recording, when the operation key is pressed, the function of the amplifier is automatically set to the CD player, the CD player is automatically set to the reproducing state, and the reproduction signal from the CD player is recorded on the tape deck.

[Problems to be Solved by the Invention] In order to perform such a synchronization operation, communication of control signals such as a function switching signal and a reproduction start signal is performed between the tape deck, the CD player and the amplifier, but the synchronization operation is complicated. As the number of control lines increases, the number of control signals increases, the number of control lines increases, control becomes complicated, and the cost increases.

Thus, an object of the present invention is to provide an electronic device system in which the above-mentioned disadvantages are eliminated.

Means for Solving the Problems According to the present invention, one control line is provided between a plurality of electronic devices, and the plurality of electronic devices operate synchronously based on control data transmitted through the control lines. An electronic device system, wherein each of the plurality of electronic devices detects control data from input data from the control line,
Output processing means for outputting control data to the control line, wherein the control data represents a data bit of “1” by a first level continuing for a first time and a data bit of “0” The first level is represented by continuing for a second time, and the second level is represented by continuing for a third time to indicate the interval between the data bits.
When it is detected that the second level is at the second level for a time longer than the time, the output processing means can output the control data to the control line. When a change from the level of 1 to the second level and the detection of being at the second level for a time longer than the third time is detected, the number of data bits detected as the control data is a predetermined number. After confirming this, the data bits detected as the control data are treated as control data.

[Operation] In the above configuration, since the method of expressing serial bit data is specified in detail, it is possible to correctly determine whether received data is noise or data. In addition, since control data is output only when it is determined that there is no input data, data collision on a control line can be prevented, and two-way communication of control data for synchronous operation between a plurality of electronic devices can be performed. It becomes possible. Further, since the number of data bits detected as control data is counted, it is possible to detect an increase or a loss of received data.

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

In FIG. 1, reference numeral 1 denotes a tape deck, and the mechanical deck of the tape deck 1 is controlled by a microcomputer (hereinafter referred to as "microcomputer") 10. Microcomputer
A reproduction key 1a and a dubbing key 1b for recording a reproduction signal from a CD on a tape are connected to 10.

A control line 50 is connected to the input port of the microcomputer 10, and this input port is grounded via the connection switch 12. The on / off control signal of the connection switch 12 is supplied from an output port of the microcomputer 10.

Reference numeral 2 denotes a CD player. The CD player 2 is controlled by the microcomputer 20. Playback key on microcomputer 20
2a is connected.

A control line 50 is connected to an input port of the microcomputer 20, and this input port is grounded via a connection switch 22. The on / off control signal of the connection switch 22 is supplied from an output port of the microcomputer 20.

Reference numeral 3 denotes an amplifier. Function switching of the amplifier 3 is controlled by the microcomputer 30. Microcomputer 30
Are connected to function keys 3a and 3b for selecting the tape deck 1 and the CD player 2, respectively.

The control line 50 is connected to the input port of the microcomputer 30, and the input port of the microcomputer 30 is grounded via the connection switch 32. The on / off control signal of the connection switch 32 is supplied from an output port of the microcomputer 30.

The control line 50 is connected to each of the tape deck 1, the CD player 2 and the amplifier 3 by the resistors 11, 21 and
Connected to the power supply terminal via 31.

In FIG. 1, audio signal lines are omitted for simplification of the drawing.

In this example, a synchronizing operation of a CD auto function, a deck auto function, and a CD sync recording is performed.

That is, when the play key 2a of the CD player 2 is pressed,
The CD player 2 enters a reproduction state, the function of the amplifier 3 is switched to the CD player, and a reproduction signal from the CD player 2 is output via the amplifier 3.

Further, when the function key 3b of the amplifier 3 is pressed, the function of the amplifier 3 is switched to the CD player, the CD player 2 enters the reproduction state, and the reproduction signal from the CD player 2 is output via the amplifier 3.

When the playback key 1a of the tape deck 1 is pressed, the tape deck 1 enters a playback state, the function of the amplifier 3 is switched to the tape deck, and a playback signal from the tape deck 1 is output via the amplifier 3. .

When the function key 3a of the amplifier 3 is pressed, the function of the amplifier 3 is switched to the tape deck, the tape deck 1 is set to the playback state, and the tape deck 1
Is output via an amplifier 3.

When the dubbing key 1b of the tape deck 1 is pressed, the function of the amplifier 3 is switched to the CD player, and the CD player 2 enters the pause state. When the tape deck 1 enters a recording state, the CD player 2 enters a reproducing state, and a reproduction signal from the CD player 2 is supplied to the tape deck 1 via the amplifier 3 and recorded. When the reproduction of the CD player 2 ends or the recording of the tape deck 1 ends, both the tape deck 1 and the CD player 2 are stopped.

In order to perform the above synchronizing operation, tape deck playback start data, CD recording start data, and recording end data are output from the tape deck 1 to the control line 50.
The player 2 outputs CD player reproduction start data, recording start data, and CD player reproduction end data to the control line 50, and the amplifier 3 outputs tape deck reproduction start data and CD player reproduction start data to the control line 50. .

In this example, these data are binary 8-bit serial data D0 to D7, each bit data is formed of a low level “L”, and a high level “H” of 2.5 msec is set between each bit data. A period is provided, and the data is sequentially output in the order of D7, D6,... (Illustrated in FIG. 2).

Here, in the bit data portion of “0”, the low level “L” is output so as to continue for 7.5 msec (shown in FIG. 3A), and in the bit data portion of “1”, the low level “L” is output.
Is output for 2.5 msec (shown in FIG. B). That is, these data “0” and “1” are transmitted to the connection switches 12 and 2
When 2 and 32 are turned on, they are output to the control line 50.

FIG. 4 shows an output waveform on the control line 50 when the data D7 to D0 = [11010011].

The flowcharts of FIGS. 5 to 7 correspond to the tape deck 1, the CD player 2, and the microcomputer 1 of the amplifier 3, respectively.
The operations of 0, 20, and 30 are shown.

In these microcomputers 10, 20, and 30, control lines
An input process of detecting data from the control line 50 and an output process of outputting data to the control line 50 are performed. First, the input process and the output process will be described.

In the input processing, the time from the fall to the rise of the input data from the control line 50 is measured, and the time is measured by 5 ms.
If it is shorter than c, it is input as data "1", and if it is longer than 5 msec, it is input as data "0". Then, when the input data is longer than 2.5 msec for a predetermined time, in this example, 10 m
When the state of sec high level “H” continues, the input of data is terminated, and only when the number of input data is eight is set as valid data.

Such input processing is performed according to the flowchart shown in FIG.

First, in step 401, a timer process is performed. This timer process is performed according to the flowchart shown in FIG. That is, in step 501, the state of the input data from the control line 50 is determined. When the input data is at the high level “H”, it is determined in step 502 whether the timer 3 has started.

If the input data is low level "L" in step 501, or if the timer 3 has not started in step 502, the timer 3 starts and returns in step 503. If the timer 3 has been started in step 502, the process returns.

Returning to FIG. 8, next, in step 402, it is determined whether the input data has changed from the high level “H” to the low level “L” (falling). When falling,
In step 403, the timer 1 is started, and in step 404
It is determined whether the input data has changed from the low level “L” to the high level “H” (rising). Step 40
Even if it is not the falling edge in step 2, the process proceeds to step 404.

If it is determined in step 404 that the time is rising, it is determined in step 405 whether the time of the timer 1 is 5 msec or less. If it is less than 5 msec, the data "1" is stored in the memory at step 406. If it is not 5 msec or less, data "0" is stored in the memory at step 407, and N1 is counted up by 1 at step 408. And return.

If it is not the rising in step 404, it is determined in step 409 whether the time of the timer 3 is 10 msec. 1
If it is not 0 msec, the routine returns. If it is 10 msec, it is determined in step 410 whether N1 = 8. N1 = 8
Otherwise, although the number of input data is not 8, the input data has been in the high level "H" state for 10 msec and the data input has been completed.
Return as 0.

When N1 = 8 in step 410, the number of input data is 8, which is valid data. Therefore, in step 412, N1 = 0 is set, and in step 413, an input completion flag is set and the routine returns.

In the output processing, the input data from the control line 50
If the high level “H” state continues for 12.5 msec in this example for a predetermined time longer than msec, output of serial data is permitted. Then, as described above, the data “1”
Output a low level "L" for 2.5 msec to the control line 50 for the bit of data "0", and output a low level "L" for 7.5 msec to the control line 50 for the bit of data "0". Is output to the control line 50.

If the input data from the control line 50 is low level "L" immediately before outputting each bit, the output is stopped.

Also, during data output, the input processing is performed, the output of the 8-bit serial data is completed, and the serial data output after 10 msec is compared with the input serial data. Complete. If the data is different, it is output again after the output is enabled.

Such output processing is performed according to the flowchart shown in FIG.

First, in step 601, a timer process (see FIG. 9) is performed, and then in step 602, the time of the timer 3 is set to 12.5 m.
Determine if it is sec. If it is not 12.5 msec, the process returns because the output is not permitted.

If it is 12.5 msec in step 602, the output is in the permitted state. Therefore, in step 603, N2 is set to 8 and then, in step 604, the state of the input data from the control line 50 is determined. When the input data is at the low level "L", the output is stopped and the output is stopped. When the input data is at the high level "H", at step 605, the connection switch connected to the input port is turned on, and The level “L” is output.

Then, after the timer 2 is started in step 606, it is determined in step 607 whether the N2th bit data is "1" or "0". When the data is “1”,
After performing input processing (see FIG. 8) in step 608,
In step 609, it is determined whether the time of the timer 2 is 2.5 msec. If not, the process returns to step 608. If the data is "0" at step 607, step 610
After performing the input processing (see FIG. 8), step 611 is performed.
It is determined whether the time of the timer 2 is 7.5 msec.
If not, the process returns to step 610.

If it is 2.5 msec in step 609 or if it is 7.5 msec in step 611, the connection switch connected to the input port is turned off and a high level “H” is output to the control line 50 in step 612.

Then, in step 613, N2 is counted down by one. In step 614, after the timer 2 is started, it is determined in step 615 whether N2 = 0. If all of the 8-bit serial data D7 to D0 have not been output and N2 = 0, then in step 616, input processing is performed (see FIG. 8).
After that, in step 617, the time of timer 2 is 2.5 msec.
Is determined. If not 2.5msec, step 6
Returning to step 16, if it is 2.5 msec, the flow returns to step 604 to perform the output processing of the next bit.

If all the 8-bit serial data D7 to D0 are output, and if N2 = 0 in step 615, input processing (see FIG. 8) is performed in step 618, and in step 619, the time of timer 2 is 10 msec. Is determined. If it is not 10 msec, the process returns to step 618. If it is 10 msec, at step 620, it is determined whether or not the input completion flag is set. If it is not set, the routine returns. If it is set, the input completion flag is reset in step 621, and in step 622, it is determined whether the output data matches the input data.

If no match is found in step 622, return
If they match, at step 623 the output completion flag is set and the routine returns.

Next, the operation of the microcomputer 10 of the tape deck 1 will be described with reference to FIG.

That is, in step 101, it is determined whether the reproduction key 1a has been pressed. If not, at step 102,
It is determined whether the dubbing key 1b has been pressed. If it has not been pressed, the input processing (see FIG. 8) is performed in step 103, and then it is determined in step 104 whether the input completion flag is set.

If it is not set in step 104, the process returns to step 101.If it is set, step 1
After resetting the input completion flag in 05, step 10
At 6, it is determined whether the input 8-bit serial data is tape deck reproduction start data. If the data is not the tape deck reproduction start data, the process returns to step 101.

When the reproduction key 1a is depressed in step 101, the tape deck reproduction start data is output in step 107 (see FIG. 10), and in step 108, it is determined whether the output completion flag is set. . If it is not set, the process returns to step 107 to perform output processing again, and if it is set, at step 109,
After resetting the output completion flag, in step 110,
The tape deck 1 is set to the reproduction state, and reproduction is started.

If the input 8-bit serial data is the tape deck reproduction start data in step 106, the process also proceeds to step 110, where the tape deck 1 is set in the reproduction state and reproduction is started.

If the dubbing key 1b is depressed in step 102, the process proceeds to step 111 to output the CD recording start data (see FIG. 10). In step 112, it is determined whether the output completion flag is set. If it is not set, the process returns to step 111 to perform output processing again. If it is set, in step 113, the output completion flag is reset.

Then, after performing the input processing (see FIG. 8) in step 114, it is determined in step 115 whether the input completion flag is set. If it is not set, the process returns to step 114. If it is set, the input completion flag is reset at step 116, and then at step 117, it is determined whether the input 8-bit serial data is CD recording start data. I do. If it is not CD recording start data, the process returns to step 114, and if it is CD recording start data, at step 118, the tape deck 1 is set to the recording state.

Then, in a step 119, it is determined whether or not the recording is completed. If the recording is not completed, an input process (see FIG. 8) is performed in step 120, and then it is determined in step 121 whether an input completion flag is set. If it has not been set, the process returns to step 119. If it has been set, the input completion flag is reset in step 122, and in step 123, it is determined whether the input 8-bit serial data is CD reproduction end data. I do. If the data is not CD reproduction end data, the process returns to step 119. If the data is CD reproduction end data, in step 124, the tape deck 1 is stopped and the CD recording is ended.

In step 119, when recording is completed,
At 25, the tape deck 1 is stopped. Then, in step 126, the recording end data output process (see FIG. 10)
After that, in step 127, it is determined whether the output completion flag is set. When not set,
Returning to step 126, the output process is performed again. If it is set, in step 128, the output completion flag is reset, and the CD recording ends.

Next, the operation of the microcomputer 20 of the CD player 2 will be described with reference to FIG.

That is, in step 201, it is determined whether the reproduction key 2a has been pressed. If not, at step 202,
After input processing (see FIG. 8), in step 203,
Determine whether the input completion flag is set. If not set, the process returns to step 201.

If it is set in step 203, the input completion flag is reset in step 204, and in step 205, it is determined whether or not the input 8-bit serial data is CD player reproduction start data. If the data is not CD player reproduction start data, it is determined in step 206 whether the data is CD recording start data. If it is not CD recording start data, the process returns to step 201.

When the reproduction key 2a is depressed in step 201, after performing the output processing of the CD player reproduction start data in step 207 (see FIG. 10), it is determined in step 208 whether the output completion flag is set. . If it is not set, the process returns to step 207 to perform output processing again. If it is set, the output completion flag is reset in step 209, and then the
The player 2 is set to the reproduction state, and reproduction is started.

In step 205, when the input 8-bit serial data is CD player reproduction start data,
Proceeding to step 210, the CD player 2 is set to the playback state,
Start playback.

If the input 8-bit serial data is CD recording start data in step 206, step 211
Then, the CD player 2 is set to the pause state.

Then, after performing the output processing of the CD recording start data (see FIG. 10) in step 212, it is determined in step 213 whether the output completion flag is set. If it is not set, the process returns to step 212 to perform the output process again. If it is set, the output completion flag is reset in step 214, and then the CD player 2 is set to the reproduction state in step 215.

Then, in a step 216, it is determined whether or not the reproduction is completed. If the reproduction is not to be ended, an input process (see FIG. 8) is performed in step 217, and in step 218, it is determined whether or not an input completion flag is set. If not set, return to step 216; if set,
After resetting the input completion flag in step 219,
In step 220, it is determined whether or not the input 8-bit serial data is recording end data. If it is not the recording end data, the process returns to step 216. If it is the recording end data, in step 221 the CD player 2 is stopped and the CD recording is ended.

If it is determined in step 216 that the reproduction has been completed, step 2
At 22, the CD player 2 is stopped. Then, in step 223, the output processing of the CD player reproduction end data (the tenth
After that, it is determined in step 224 whether the output completion flag is set. If it is not set, the process returns to step 223 to perform output processing again. If it is set, in step 225, the output completion flag is reset and the CD recording ends.

Next, the operation of the microcomputer 30 of the amplifier 3 will be described with reference to FIG.

That is, in step 301, it is determined whether the function key 3b has been pressed. If not, it is determined in step 302 whether the function key 3a has been pressed. If it is not depressed, an input process (see FIG. 8) is performed in step 303, and then it is determined in step 304 whether the input completion flag is set. If not, the process returns to step 301.

If it is set in step 304, after resetting the input completion flag in step 305, it is determined in step 306 whether the input 8-bit serial data is CD player reproduction start data. If the data is not CD player reproduction start data, it is determined in step 307 whether the input 8-bit serial data is tape deck reproduction start data. If the data is not tape deck reproduction start data, it is determined in step 308 whether the data is CD recording start data. If it is not CD recording start data, the process returns to step 301.

If it is determined in step 301 that the function key 3b has been pressed, then in step 309, after performing the output processing of the CD player reproduction start data (see FIG. 10), in step 310
It is determined whether the output completion flag is set. If it is not set, the flow returns to step 309 to perform output processing again.
After resetting the output completion flag in step 1,
Then, change the function to a CD player and finish.

In step 306, when the input 8-bit serial data is CD reproduction start data, or in step 308, the input 8-bit serial data is
D Even when the recording start data, proceed to step 312,
Set the function to CD player and exit.

If the function key 3a is depressed at step 302, the tape deck playback start data is output at step 313 (see FIG. 10).
At 4, it is determined whether the output completion flag is set.
If it is not set, the process returns to step 313 to perform output processing again.
After resetting the output completion flag in 315, step 3
At 16, the function is set to the tape deck, and the processing ends.

If the input 8-bit serial data is the tape deck reproduction start data in step 307, the process proceeds to step 316, and the function is set to the tape deck, and the process is terminated.

As described above, according to the present embodiment, a plurality of control lines 50 are provided between the tape deck 1, the CD player 2 and the amplifier 3 by using one control line 50 disposed between the tape deck 1, the CD player 2 and the amplifier 3. Transmission and reception of control signals are performed. Therefore, control of the synchro operation is easy, and
An increase in cost due to an increase in the number of control lines can be prevented.

Further, in the input processing, when all the data D7 to D0 of the serial data are not input, the data is not regarded as valid data, so that a malfunction due to erroneous data can be prevented.

Further, in the output processing, when the input from the control line 50 is at the low level “L”, the output to the control line 50 is stopped, so that the input data from the other does not collide with the output data, One control line 50 enables good bidirectional communication.

Further, in the output process, when the input process is performed simultaneously and the output data and the input data do not match,
Since the output data is output to the control line 50 again, the control signal can be transmitted accurately.

Note that the number of bits of data transmitted and received on the control line 50 and the low level “L” for forming data “1” and “0”
Of course, the time of the high level "H" between the bits and the like are not limited to the above-described embodiment.

Further, in the above embodiment, binary data of “1” and “0” are transmitted and received. However, even for data of three or more values, the time change of the low level “L” is made in three or more stages. By changing it, the same can be realized.

In the above-described embodiment, the connection switches 12, 22, and 32 are provided outside the microcomputers 10, 20, and 30, respectively.
And 32 can be included in the microcomputers 10, 20, and 30 (see the broken line in FIG. 1).

In the above embodiment, the tape deck 1, the CD player 2
Although this is an example of an audio system including an amplifier 3 and the present invention, the present invention can be similarly applied to an electronic device system in which a plurality of electronic devices perform a synchronous operation.

[Effects of the Invention] As described above, according to the present invention, since control data communication is performed using one control line, the cost is low. Further, since the method of expressing the serial bit data is specified in detail, it is possible to correctly determine whether the received data is noise or data. Also, since control data is output only when it is determined that there is no input data, data collision on the control line can be prevented, and bidirectional communication of control data for synchronous operation between a plurality of electronic devices can be performed. It can be carried out. Further, since the number of data bits detected as control data is counted, an increase or a loss of received data can be found. Therefore, even if the synchronization operation of a plurality of electronic devices becomes complicated and the number of control data increases, the number of control lines does not increase, and the control of the synchronization operation becomes easy and reliable. Cost increase can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIGS. 2 to 4 are explanatory diagrams of input / output data, and FIGS. 5 to 10 are flowcharts for explaining the operation of the embodiment. 1 Tape deck 1a Play key 1b Dubbing key 2 CD player 2a Play key 3 Amplifier 3a, 3b Function key 10 Microcomputer 12 Connection switch 20 Micro Computer 22 Connection switch 32 Connection switch 50 Control line

Continuation of the front page (56) References JP-A-63-300464 (JP, A) JP-A-56-48743 (JP, A) JP-A-62-9563 (JP, A)

Claims (1)

(57) [Claims] An electronic equipment system in which one control line is arranged between a plurality of electronic equipments, and wherein the plurality of electronic equipments operate in synchronization based on control data transmitted through the control lines, Each of the plurality of electronic devices includes input processing means for detecting control data from input data from the control line, and output processing means for outputting control data to the control line. "Is represented by the first level continuing for the first time, the data bit" 0 "is represented by the first level continuing for the second time, and the second level is represented by the third level. When the input processing means detects that the input data is at the second level for a time longer than the third time, the output processing means The control data can be outputted to the control line, and the input processing means changes the input data from the first level to the second level for a time longer than the third time. Detecting that the number of data bits detected as the control data is a predetermined number, and treating the data bits detected as the control data as control data. Electronic equipment system.