JPH0255964B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device using a plurality of variable impedance circuits and the like.

Generally, in audio equipment, a large number of variable impedance circuits are used, such as bass control, treble control, balance control, and volume control. These variable impedance circuits usually connect a variable resistor directly to the signal transmission line, but some of them do not connect the variable resistor directly to the signal transmission line.
Electronic volumes are also used in which impedance circuits such as transistors connected to the signal transmission path are controlled by corresponding variable resistors. However, when using such conventional variable impedance circuits, variable resistors corresponding to the number of variable impedance circuits are required, and the number of operation knobs for the variable resistors increases, so the area of the operation panel for car audio equipment etc. is small. This has become a major problem in the design of electronic devices.

The present invention has been made to solve these conventional problems, and it allows a plurality of impedance circuits to be controlled by a common operating means, and a single display means to display, for example, the dynamic level of an audio signal. The present invention provides a control device capable of displaying the selected type of control level for a predetermined period of time when selecting and switching various controls such as volume control.

Hereinafter, the present invention will be explained using examples thereof.
FIG. 1 is a block diagram of the main parts of a car audio device that is an embodiment of the present invention.
is a DC voltage generator formed by connecting resistors R ₁ to _{R o} in series between the power supply and ground, and 2 is the resistor R ₁
A switch group consisting of switches S ₀ to _{S o} connected between each connection point of ~ R _o and the output terminal 3, and H ₁ to _{H 3} connect the output voltage of the DC voltage generator 1 to the control terminals G ₁ to _{G 3} . Hold-through gates that are held or passed according to the applied control signal; 4 to 6 are impedances for tone control, balance control, and volume control whose transfer impedance changes according to the output voltage of hold-through gates _H1 to _H3. Circuits 7 to 9 are switches 1 for switching control signals of hold-through gates H ₁ to _{H 3} ;
0 is a switch that closes in response to closing any one of the switches S ₀ to S _o of switch group 2, 11
~13 are switches that open and close in conjunction with switches 7 to 9, respectively, 14 is a NAND gate, 15 is a one shot multi, and 16 is a one shot multi 15.
17 is an inverter, 1 is a timer that responds to the output of
9 is an LED dot driver that drives a display device 21 consisting of a row of light emitting diodes, and 20 is also an LED.
It is a line driver.

FIG. 2 is a front view of the main parts of the audio equipment related to FIG. ₀ to T _o are operation knobs for switches S ₀ to _{S o} .

Next, the operation of this audio device will be explained starting with the tone control. In this case, switch 7 is closed and switches 8 and 9 are left open. After closing the switch 7, when one of the switch groups 2, for example, the switch S _o , is further closed, the control terminal G ₁ of the hold-through gate H ₁ becomes low level, and the hold-through gate H ₁ enters the through mode. When the hold-through gate _H1 becomes a through-mold, the output voltage of the DC voltage generator 1 is directly supplied to the impedance circuit 4 as a control signal, and the transfer impedance of the impedance circuit 4 changes according to the output voltage. . That is, by closing the switch 7 and simultaneously operating the switches _S0 to _S0 of the switch group 2 as appropriate to apply a predetermined output voltage to the impedance circuit 4, tone control can be performed freely.

Note that while tone control is being performed, switches 8 and 9 are open and control terminals G ₂ and G ₃ are at high level, so hold-through gates H ₂ and H ₃ are in hold mode, and hold-through gates are in the hold mode.
H ₂ and H ₃ continue to maintain the previously set output voltage. Therefore, the transfer impedance of the impedance circuits 5 and 6 is kept constant, and the balance and volume do not change.

Next, balance control will be explained. In this case, close switch 8, switch 7,
Leave 9 open. After closing the switch 8, when one of the switch groups 2, for example, switch S _o , is further closed, the control terminal G ₂ of the hold-through gate H ₂ becomes low level, and the hold-through gate H ₂ enters the through mode. When the hold-through gate _H2 enters the through mode, the output voltage of the DC voltage generator 1 is directly supplied to the impedance circuit 5 as a control signal, and the transfer impedance of the impedance circuit 5 changes according to the output voltage. . That is, by closing the switch 8 and simultaneously operating the switches _S0 to _S0 of the switch group 2 as appropriate to apply a predetermined output voltage to the impedance circuit 5, balance control can be performed freely.

In addition, while performing balance control,
Since switches 7 and 9 are open, the tone and volume do not change as before.

Next, the volume control will be explained. In this case, switch 9 is closed and switches 7 and 8 are left open. After closing switch 9, if one of switch group 2, for example switch S _o-1 , is further closed, control terminal G ₃ of hold-through gate H ₃ is closed.
becomes low level, hold through gate _H3
is in through mode. hold through gate
When _H3 is in through mode, DC voltage generator 2
The output voltage is directly supplied to the impedance circuit 6 as a control signal, and the transfer impedance of the impedance circuit 6 changes in accordance with the output voltage. That is, at the same time as closing switch 9, appropriately operate switches S ₀ to _{S o} of switch group 2,
By applying a predetermined voltage to the impedance circuit 6, the volume can be freely controlled.

Note that while the volume control is being performed, the switches 7 and 8 are open, so the tone and balance do not change as described above. In addition, when adjusting the tone control, balance control, and volume control, when each reaches the desired level, switch 7,
8 or switch 9, the tone, balance and volume will remain in that state.

Furthermore, to explain the display, switch 7,
8 and 9 are all open, the output of the NAND gate 14 is at a low level, and the one-shot multi 15 does not output any pulse. At this time, the output of timer 16 is at high level,
The LED line driver 20 operates, and the LED dot driver 19 stops. Therefore, the output level of the impedance circuit 6 is higher than that of the LED line driver 2.
0 on the display device 21. That is, in this state, the dynamic level of the audio equipment is displayed.

Next, when one of the switches 7 to 9 is closed and at the same time one of the switches S ₀ to S _o of the switch group 2 is closed, the output of the NAND gate 14 is inverted from low level to high level, and the one shot multi 15
One pulse is output from. When one pulse is output from the one-shot multi 15, the output of the timer 16 is then inverted to a low level for a certain period of time. During this time, the LED line driver 20 is inactive and the LED dot driver 19 is in operation. By the way, in conjunction with switches 7 to 9, switches 11 to 9
Since one of the hold-through gates H 1 to H 3 is closed, the LED dot driver 19 is supplied with the output of one of the hold-through gates H ₁ to _{H 3} , and the level corresponding to the output is displayed on the display device 21 . That is, in this state, the output voltage of the DC voltage generator 1 set by the switch group 2 is displayed in the form of a dot. Thereafter, after a certain period of time has elapsed, the output of the timer 16 is again inverted to high level, so that the dynamic level is displayed on the display device 21 as described above.

FIG. 3 is a block diagram of main parts of another embodiment of the present invention, in which 1' is a data generator consisting of an address decoder 1'a, a ROM 1'b, etc., and 2' is the data generator. A switch group consisting of switches _S'0 to _S'o is connected between each input terminal of the address decoder 1'a of the address decoder 1'a and ground, and _H4 to _H6 connect the output of the data generator 1' to the control terminal _G4. -Hold-through gates that hold or pass according to the control signal applied to _G6 , 31-33 are A-D converters that convert the output data of hold-through gates _H4 - _H6 into analog signals, and 4-6 are A-D converters. - Impedance circuits for tone control, balance control, and volume control whose transfer impedance changes according to the output level of the D converters 31 to 33; 7 to 9 are switches for switching control signals of hold-through gates _H4 to _H6 ; 10
is a switch 14 that closes in response to the closing of one of the switches S' ₀ to S' _o of the switch group 2';
is Nand Gate, 15 is One Shot Multi, 1
6 is a timer that responds to the output of the one-shot multi 15; 17 is an inverter; 19 is an LED dot driver that drives a display device 21 consisting of a row of light emitting diodes; and 20 is an LED line driver.

The features of this embodiment, compared to the embodiment of FIG _.
~ _H6 is adapted to process digital signals. Therefore, the operations of the tone control, balance control and volume control in this embodiment are basically the same as those in the embodiment shown in FIG. 1, and therefore their explanation will be omitted.

FIG. 4 is another circuit diagram of the display circuit section that can be used in the embodiments shown in FIGS. 1 and 3. FIG. In this figure, 4, 5, and 6 are the same impedance circuits for tone control, balance control, and volume control as described above;
3 to 35 are switches that open and close in conjunction with the aforementioned switches 7 to 9, respectively, and L ₁ to _{L o} are light emitting diodes R ₁ and B ₁ to emit red and green light, respectively.
LED unit consisting of a pair of R _o and B _o , 37 is LED
A display device with units L ₁ to L _o arranged in a row.
LED line driver, 36 of the same display device
It is an LED dot driver. To explain this operation, first, when all the switches 33 to 35 are open, there is no input to the LED dot driver 36, and all output terminals are at a low level. Therefore, the light emitting diodes R ₁ to R _o do not emit light. On the other hand, since the LED line driver 37 outputs a predetermined signal according to the output of the impedance circuit 6, the output of the audio equipment, that is, the dynamic level, is changed to a green light line by the light emitting diodes _B1 to _B0 . It is displayed as follows.

Next, when one of the switches 33 to 35 is closed, the control voltage of the corresponding impedance circuit 4 to 6 is input to the LED dot driver 36. Therefore, the control voltages of the impedance circuits 4 to 6, ie, the current set levels, are displayed in red light dots by the light emitting diodes R ₁ to _{R o} . On the other hand LED
As described above, the line driver 37 outputs a predetermined signal according to the output of the impedance circuit 6, so that the dynamic level is higher than that of the light emitting diode _B1 ~
It is displayed as a line with green light by B _o .

As described above, according to the control device of the present invention,
an operating means, a signal generating means that outputs a predetermined signal in response to the operation of the operating means, a plurality of hold-through gate means capable of holding or passing the output of the signal generating means, and the plurality of hold-through gate means. an impedance circuit in which the transfer impedance of the signal transmission path changes according to each output supplied by the gate means; a selection means for selectively supplying a hold command or a pass command to the plurality of hold-through gate means; and a display means. and switching means for switching the output of the hold-through gate means to which the pass command is supplied to be input to the display means in accordance with the selection by the selection means; display control means for displaying the output of the hold-through gate means selected by the switching means for a predetermined period of time after operation of the selection means, so that a plurality of impedance circuits can be operated by a common operation means. For example, a single display means usually displays the dynamic level of the audio signal, and when various controls such as volume control, tone control, balance control, etc. are selected and switched, the selected type is displayed for a predetermined period of time. In order to display the control level, the display can be switched with a single touch not only when adjusting the level but also when checking various control levels, etc. After that, the control level is displayed for the necessary time for adjustment and confirmation without any operation. It is possible to automatically return to the dynamic display afterward, making it possible to effectively utilize the area of the display section and operation panel of car audio equipment, etc., and significantly improving operability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the main parts of a car audio device that is one embodiment of the present invention, FIG. 2 is a front view of the main parts of the audio device related to FIG. 1, and FIG. 3 is another embodiment of the present invention. FIG. 4 is another circuit diagram of the display circuit section that can be used in the embodiment shown in FIGS. 1 and 3. 1...DC voltage generator, 2...Switch group, H ₁ ~
H ₆ ...Hold-through gate, 4-6...Impedance circuit, 7-9...Switch.

Claims (1)

[Claims] 1. An operating means, a signal generating means that outputs a predetermined signal in response to the operation of the operating means, a plurality of hold-through gate means that can hold or pass the output of the signal generating means, and a plurality of hold-through gate means that can hold or pass the output of the signal generating means. an impedance circuit in which the transfer impedance of the signal transmission path changes in accordance with each output supplied from the through gate means; a selection means for selectively supplying a hold command or a pass command to the plurality of hold through gate means; and a display. means, switching means for switching the output of the hold-through gate means supplied with the pass command to be input to the display means in response to a selection by the selection means; A control device comprising display control means for displaying a level and displaying an output of the hold-through gate means selected by the switching means for a predetermined period of time after operation of the selection means.