JPH0218257B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD OF THE INVENTION The present invention relates to a seating-linked movable speaker system that automatically moves a speaker depending on the seating situation in a vehicle interior. Prior Art and Problems We have previously proposed a system in which speakers for high and midrange reproduction are movably installed in the cabin of a so-called 1-box car. In this movable speaker system, for example, rails are laid above both sides of the vehicle interior so that the speakers can slide on these rails, so the speaker position can be adjusted according to the preferences of the person sitting in the rear seat. can be changed arbitrarily, which is convenient for sound image control and sound field correction. However, it is troublesome to manually change the speaker position every time the seating situation (occupants and their positions) changes, and the position is not always selected according to the design value. Purpose of the Invention The present invention attempts to eliminate the above-mentioned drawbacks by automatically detecting the seating situation in the vehicle interior and automatically moving the speaker to a preset optimal position corresponding to the situation. It is something. Composition of the Invention The present invention incorporates a part of a plurality of speakers installed in a vehicle interior into a mechanism movable by a drive source, and also provides a seating sensor for detecting the seating situation of each seat. The speaker incorporated in the movable mechanism is automatically moved to a preset position depending on the seating situation, and this will be explained in detail below with reference to the illustrated embodiment. Explain. Embodiment of the invention Figure 1 shows the internal configuration of a box car (BOX CAR) showing an embodiment of the invention, where DS is the driver's seat,
AS is the passenger seat, RS ₁ and RS ₂ are the rear seats. SP ₁
~SP ₄ is a speaker installed at a fixed location for reproducing low to high frequencies. On the other hand, SP ₅ and SP ₆ use rails above the inside of the vehicle for sound field correction and sound image control.
L ₁ and L ₂ are slideable speakers for medium and high frequency reproduction (referred to as roof side speakers here), and these speakers SP ₅ and SP ₆ can be moved to one of the stopping positions depending on the seating situation. It is an object of the present invention to automatically move the FIG. 2 shows an example of a circuit that automatically detects the seating situation, and 10 is a seating sensor section using a pressure sensor. This seating sensor section 10 is the driver's seat DS shown in FIG.
A seating sensor 11 that turns on when a person is seated in the passenger seat AS, and a seating sensor 1 that turns on when a person sits on the front passenger seat AS.
2, and seating sensor 1 that turns on when a person is seated at the left end, center, or right end of rear seat RS ₁ .
3 to 15, and a seating sensor 16 that turns on when a person is seated at the left end, center, or right end of the rear seat RS ₂ .
18, sensors 13 to 15 are connected in parallel, and sensors 16 to 18 are also connected in parallel. The sensor 11 is connected between the power supply Vcc and the earth E, and when turned on, the 4-bit 16-line decoder 2
Input H (high) level to input terminal A of 0.
The input terminal of the decoder 20 corresponding to the sensor 12 is B, and the sensor groups 13 to 15 and 16 to 18
The input terminals corresponding to are C and D, respectively.
A chattering prevention circuit 19 is provided so that even if each sensor chattering occurs due to an occupant sitting up again, vibrations during driving, etc., there is no effect. This chattering prevention circuit 19 is a parallel circuit of a resistor _R1 and a capacitor _C1 , and is connected between each input terminal A to D of the decoder 20 and the ground E. The capacitor C ₁ is charged rapidly, but its discharge is delayed by the time constant C ₁ ,
You can set it to several seconds by increasing R ₁ . The decoder 20 operates to set only one of the 16 lines of outputs 1 to 16 to H and all the other 15 lines to L (low) according to the conversion table shown below for the 4-bit inputs A to D.

[Table] In the table above, "output" indicates the output that becomes H, and the circle mark next to the input (seating position) indicates the input (seated seat) corresponding to the sensor that is turned on. In this example, for outputs 1 to 4, the speaker position (stop position)
, and similarly select the speaker position for outputs 5 to 8, the speaker position for outputs 9 to 12, and the speaker position for outputs 13 to 16. , this part will be explained with reference to FIG. Changeover switch FR,
FL, R1, R2, ALL are for realizing the speaker position ~ regardless of the seating situation, and this will also be explained with reference to FIG. The speaker positions described above are suitable for sound image control or sound field correction centered on the front seats DS and AS. On the other hand, the speaker position includes up to the middle rear seat RS ₁ , and the speaker position also includes the rear seat RS ₂ . However, the speaker position is a position that is selected for all seats when sound image control such as delay and crosstalk is not performed. Returning to FIG. 2 again, each output 1 of the decoder 20
16 open collector transistors 21 ₁ , 21 ₂ , . . . driven by 16 transistors are provided.
The logic shown in Table 1 is achieved by appropriately connecting these collectors in a wired-OR type. 22 is an output terminal connector, which has five types of signal terminals ALL', R2', R1', in addition to the power terminal Vcc and ground terminal E.
There are FL′ and FR′. This corresponds to a changeover switch described later. Figure 3 shows the signal from the seating signal processing section in Figure 2.
FIG. 2 is a circuit diagram of a speaker position control section that automatically moves the roof side speakers SP ₅ and SP ₆ of FIG. 1 to any of the stop positions in response to ALL', R2', . . . . The connector 22' in FIG. 3 corresponds to the connector 22 in FIG. is supplied to ICs 26 and 27 through. When the inputs I ₁ to I ₅ become L, these ICs 26 and 27 turn the corresponding outputs O ₁ to O ₅ to L, or more precisely, turn on the open collector or open drain transistor in the output stage to draw current. Enter in reverse
When I ₁ to I ₅ become H, the corresponding outputs O ₁ to O ₂ are opened. Relay contact 23a is a make contact of relay 23, and when manual/automatic changeover switch 28 is turned on (automatic), it switches from break side B to make side M, and receives a signal input from connector 22'. 23b is also a make contact of the relay 23, and when made, turns on the transistor group 24 at all times. 29 is a manual changeover switch FR, FL,
R1, R2, and ALL are connected to the connector, and when the switch 28 is turned off (manual) and the relay 23 is turned off, the selection is made by the contact 23a. 30 is the roof side speaker SP ₅ shown in Fig. 1,
This is the motor that moves SP ₆ . The following mechanisms can be considered for the power transmission mechanism from the motor to the speaker. For example, the rotation of the motor 30 is reduced by a worm gear, and the rotation is transmitted to the drive pulley. This driving pulley is provided at one end of the rails L ₁ and L ₂ , and a paired driven pulley is provided at the other end of the rail, with a thread-like endless belt stretched between them. Then, connect this belt to a hollow rail.
Run inside L ₁ and L ₂ , and install speaker SP ₅ (SP ₆₎ at one point.
(Similarly on both sides) are fixed and the speaker is moved according to the rotation of the motor 30. The moving position of this speaker rotates in conjunction with the above pulley, for example
It is detected as the voltage value V of a 3600° (10 rotations) type potentiometer 31. 32a is a contact point of a relay 32 that turns the motor 30 on and off. 33
a and 33b are contacts of a relay 33 that switches the rotation direction (polarity) of the motor 30. 34 is motor 3
This is the 0 power supply terminal, and a battery is connected here. When one of the corresponding inputs Ii (i = 1 to 5) of the IC 26 becomes L due to the signal from the seating signal processing section applied through the connector 22', the paired output Oi becomes L and one end of the resistor R _s2 Ground. The resistors R _s2 each have a different resistance value and are connected in series with the resistor R _s1 to divide the power supply Vcc and generate a reference voltage Vs of Vs=R _s2 /R _s1 +R _s2 Vcc. This reference voltage Vs becomes the inverting input of the comparator 40, and the voltage V of the potentiometer 31 led to its non-inverting input.
compared to This reference voltage Vs indicates the speaker stop position ~ in Figure 1, and by setting the value of the semi-fixed resistor R _s2 in advance, V =
When it becomes Vs, the movement of speakers SP ₅ and SP ₆ is stopped. In other words, while V<Vs, the comparator 40
Since the output of driver transistor 4 is L, driver transistor 4
1 is off. Therefore, polarity switching relay 3
3 is not energized, so the contacts 33a and 33b are in the state shown. At this time, assuming that the rotation of the motor 30 is set in a direction that increases the detected voltage V of the potentiometer 31, the output of the comparator 40 will become H when V=Vs.
Transistor 41 and therefore relay 33 are turned on to switch contacts 33a and 33b. As a result, the motor 30 starts reverse rotation and attempts to return to V<Vs, but as soon as V<Vs, the output of the comparator 40 becomes L, and the motor 30 reverses in the same manner as described above, so V = Vs, and then V>Vs. Since this operation is repeated thereafter, the speakers SP ₅ and SP ₆ vibrate in a minute range around one stop position. The circuit that suppresses the above-mentioned vibration and turns off the relay 32 to stop the motor 30 when V = Vs for the first time will not be described later, but it has a circuit function that reverses the polarity of the motor 30 when V = Vs. teeth,
This is important in preventing the speakers SP ₅ and SP ₆ from running out of control. In addition, when V>Vs, V is decreased,
It is clear that the initial setting for rotating the motor 30 in the direction of increasing V when V<Vs can be easily performed by using the relay contacts 33a and 33b or by selecting the polarity of the power terminal 34. 42 and 43 are ICs that detect the change point of the output of the comparator 40, and the IC42 detects the change from H to L,
Further, the IC 43 detects the change from L to H and generates a pulse with a minute time width. This pulse is OR gate 44, AND gate 45, OR gate 4
6 to drive a flip-flop (latch) 47 and invert its output Q. This flip-flop 47 drives a driver transistor 48 with its Q output. That is, when Q=H, the transistor 48 is turned on. The OR gate 44 is for combining the outputs of the ICs 42 and 43 in order to judge whether the output change of the comparator 40 has reached the target position whether it is from H to L or from L to H. The AND gate 45 prevents the OR gate 44 output from passing while the Q output of the flip-flop 47 is L (while the motor 30 is stopped) to prevent malfunction due to noise (unintended rotation of the motor 30). belongs to. Therefore, this AND gate 45
The output of is input to OR gate 46 as a signal for resetting flip-flop 47, the other input of which is primarily for setting flip-flop 47. One of the other inputs of OR gate 46 is the output of IC50.
The output of the IC 50 is combined with a control signal CTL from another system by an OR gate 51, but this signal will be omitted here. The IC50 inputs the pulse P generated by the output _O6 of the IC26. This pulse P is
This occurs for a minute time every time any one of the inputs I ₁ to _{I 5} of IC 26 becomes L, and the IC 5 that receives this
0 generates an activation signal. The purpose of this IC50 is
Expanding the width of the output pulse P of IC26,
It is intended to absorb the chattering of the switch, and its circuit function is one-shot and multi-shot. Incidentally, a circuit 52 is provided which always sets the output Q of the flip-flop 47 to H to turn on the transistor 48 when the power is turned on. This circuit 52 delays the charging of the capacitor C ₂ with the resistor R ₂ when the power supply Vcc rises, temporarily sets the output of the inverter N ₁ to H when the power is turned on, and forces the flip-flop 47 to the set state (Q = H). ). R ₃ is the discharge resistance. When this power is turned on, the input I ₁ of IC26, 27
is temporarily grounded through the capacitor 53, so it is equivalent to pressing the switch FR. Therefore, when the power is turned on, the speakers SP ₅ and SP ₆ in Figure 1
moves to the specified position regardless of the previous stop position,
Played in FR state. This is because the driver is always seated in the driver's seat DS. The IC 27 has the same function as the IC 26, but a load connected to the connector 60, such as a relay driver 61 for sound image control, is driven through an inverter 62. In addition, the connector 63 has a switch FR,
An LED 64 that lights up when FL, . . . is turned on is connected, and this is also driven through an inverter 65. The outputs O ₁ to _{O 5} of the IC 27 are also used to control the transistor group 25 . That is, the input
I ₁ to I ₅ are all H, and outputs O ₁ to _{O 5} are all H (open).
If so, the transistor group 25 is all turned on by Vcc, so the ON information of the switches FR, FL, etc. is transmitted to the ICs 26, 27. For example, when the switch FR is turned on, the output O ₁ of the IC 27 is is L
(on), the corresponding one of the transistor group 25 (the left end in this example) is turned off to prevent the same switch information from being input continuously. This is because the stopped speakers SP ₅ and SP ₆ pass the set point and then stop beyond the set stop position due to a slight time delay until the stop signal is issued and the motor is stopped. . This is to prevent the same switch from operating when the same switch is pressed again in order to recover from this slight error. Further, when the switch 28 is turned off (manual) and the contact 23b of the relay 23 is in the state shown in the figure, the transistor group 24
Since it is controlled by the output of the flip-flop 47, the transistor group 24 is all turned off while the motor 30 is rotating (=L). This is 1
This is because no other manual operation is accepted until the speaker movement corresponding to the previous manual operation is completed. still,
Seating signal for 4 different speaker positions
ALL', R2'...or switch ALL, R2,
There are 5 different ways to do this, such as placing more emphasis on the driver's seat DS or passenger seat AS.
This is to control whether or not to place emphasis on Although this control is performed electrically and is not shown here, seating in the driver's seat DS can be detected by FR', and seating in the passenger seat AS can be detected by FL'. The general operation is as follows. For example, when a person is seated only in the driver's seat DS shown in FIG. 1, only the sensor 11 shown in _FIG. becomes L. If this state does not change from the time the power is turned on, the initial setting circuit 52 and the capacitor 53
Accordingly, the speakers SP ₅ and SP ₆ in FIG. 1 are at the stop position. After that, when seated in the rear seat RS ₁ shown in Fig. 1, the sensors shown in Fig. 2 are not only 11 but also 13~
15 is turned on. Therefore, since the seating signal R1' becomes L by the decoder 20, the reference voltage Vs of the comparator 40 in FIG.
Switching occurs when the output _O3 of 6 becomes L. As a result, the motor 30, which starts moving due to the output pulse from the IC 26, receives the voltage V from the potentiometer 31.
Since the reference voltage Vs and the reference voltage Vs do not match, V=Vs again.
Rotate to the position and stop. This position is the position to which the speakers SP ₅ and SP ₆ are automatically moved, that is, the stop position in FIG. 1. Thereafter, the speaker position is automatically switched to any one of ~ depending on the seating situation. Effects of the Invention As described above, according to the present invention, some of the speakers of a car audio system using a plurality of speakers are automatically moved to a position that is pre-designed as optimal for sound field reproduction according to the seating situation. This has the advantage that an acoustic space can always be created according to the seating situation without the need for complicated manual operations. In addition, since the sound image is localized by moving some of the speakers themselves, when changing the localization of the sound image, it is necessary to adjust the sound quality (frequency characteristics, distortion, etc.) that are other elements in the acoustic space, Optimal acoustic sections can be created without deteriorating the sense of spaciousness and presence of the entire system.

[Brief explanation of drawings]

1 to 3 are diagrams showing one embodiment of the present invention, in which FIG. 1 is a plan view showing the interior of the vehicle, FIG. 2 is a circuit diagram showing an example of a seating signal processing section, and FIG. 3 is a speaker FIG. 3 is a circuit diagram showing an example of a position control section. In the diagram, DS, AS, RS ₁ , RS ₂ are seats, SP ₁ to _{SP 4}
is a fixed speaker, SP ₅ to _{SP 6} is a movable speaker, 1
0 is a seating sensor section, 30 is a motor, 31 is a potentiometer, 32 and 33 are motor control relays,
40 is a comparator.

Claims (1)

[Claims] 1 Incorporating some of the multiple speakers installed in the vehicle interior into a mechanism that can be moved by a drive source,
A seating sensor is provided to detect the seating situation of each seat, and the speaker incorporated in the movable mechanism is automatically moved to a preset position according to the detected seating situation. Features a seat-linked movable speaker system.