JPS63272112A - Signal switching device - Google Patents

Abstract

PURPOSE:To smoothly replace a sound by setting plural time limits, outputting a control signal to input and increase and decrease a switching signal outputted from a timer circuit to an electronic volume circuit, inputting the result to a signal adjusting circuit and switching a signal for broadcasting. CONSTITUTION:A timer circuit 1 outputs 1 or plural switching signals to switch at a time interval set by a time limit setting circuit 3. In accordance with these switching signals, plural two electronic volume circuits 4 and 5 are successively selected and two outputs are increased and decreased. In accordance with the output of these two increasing and decreasing electronic volume circuits 4 and 5, a signal adjusting circuit 6 amplifies and outputs two corresponding input signals and the output signal is outputted through an amplifier to a speaker 8. Thus, while two signals are simultaneously increased and decreased, a smooth sound is replaced.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a signal switching device that automatically switches broadcast signals such as various music, commercials, announcements, etc.

(B) Prior Art Recently, in supermarkets, convenience stores, etc., there is a demand for broadcasting signals such as music broadcasts, commercials, announcements, etc. to be switched and transmitted inside the store. This switching of broadcasts can be easily done by playing back what has been recorded on a tape in advance, but the same broadcasts are always repeated, which can be boring for customers.

Therefore, it is desirable to broadcast by switching between cable broadcasting, record players, tape recorders, and other devices.

However, in this case, if the broadcasting is not switched smoothly, the customer will feel uncomfortable. Therefore, it is necessary to change the broadcast signal by performing a fade operation that simultaneously increases or decreases the two broadcast signals and replaces the sound. Conventionally, these operations were performed manually, as seen in department stores. That was the actual situation.

(c) Problems to be Solved by the Invention However, manually switching broadcast signals requires high labor costs and cannot be used in small-scale supermarkets and combination stores. For this reason, automation of broadcast signal switching is desired, but nothing practical has been developed yet.

SUMMARY OF THE INVENTION In view of the above points, it is an object of the present invention to provide a signal switching device that can automatically and smoothly switch broadcast signals.

(d) Means for solving the problem The signal switching device according to the present invention includes a time limit setting circuit that sets a plurality of time limits, and a timer circuit that outputs one or more switching signals set by the time limit setting circuit. , a plurality of electronic volume circuits that increase/decrease the output according to the switching signal output from the timer circuit, and increase/decrease the output level of the plurality of corresponding input signals according to the increase/decrease in the output of the plurality of electronic volume circuits. It is characterized by comprising a signal conditioning circuit and an amplification circuit that amplifies the output of the signal conditioning circuit and outputs it to a speaker.

(E) Effect With the above configuration, the timer circuit outputs one or more switching signals that switch at time intervals set by the time limit setting circuit.

In response to these switching signals, two of the plurality of electronic volume circuits are sequentially selected and the outputs of the two are increased or decreased. In accordance with the outputs of the two electronic volume circuits that increase or decrease, the signal adjustment circuit increases or decreases the corresponding two input signals and outputs them. This output signal is outputted to a speaker via an amplifier, and as a result, the two signals are increased and decreased at the same time, resulting in a smooth exchange of sounds.

(f) Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a configuration diagram of a signal switching device according to an embodiment of the present invention.A timer circuit 1 is a circuit that outputs a switching signal TS at two different time intervals. As shown, a commercially available IC (for example, M5184 manufactured by Mitsubishi Electric) is equipped with an oscillation circuit 1a, a counter circuit 1b formed by cascading a plurality of flip-flops, an output circuit 1c, etc.
5L) Constructed using ld.

In this configuration, when the voltage VL applied to the terminal ■ gradually increases with respect to the reference voltage VR applied to the terminal ■ of the IC1d and exceeds the reference voltage VR, the switch circuit inside the oscillation circuit 1a is reversed and the discharge occurs. A circuit is formed and the charges accumulated in the external capacitor CI are rapidly discharged. This results in
Although the external voltage VL decreases, the discharge circuit is turned off near 0 (v) and returns to the charging state again. By repeating this charging and discharging, oscillation continues, and the first oscillation circuit 1a outputs a pulse signal of a frequency corresponding to the oscillation frequency at that time.

The counter circuit 1b counts this pulse signal and outputs a signal that alternately switches between the 'I+' level and the IIM level at every fixed count.Furthermore, this signal passes through the output circuit 1c and is sent from the terminal ■ to the switching circuit 2. Output as switching signal TS.

In this switching circuit 2, the base resistor R1 is connected to the timer 1
A common emitter transistor Q1 connected to the output terminal of
And the base resistor R2 is connected to the collector of this transistor Q+.
and a common emitter transistor 02 connected to the transistor 02. These transistors Q1. The collector of Q2 is connected to the control power supply +Vcc via resistors RJ and R4.

With this configuration, the switching signal TS output from the timer circuit 1
When becomes trH″′, transistor Q1 turns on and Q2
becomes OFF. Meanwhile, the switching signal changed to 11M1.

Transistor 1 turns OFF and Q2 turns ON.

A time setting circuit 3 is provided connected to the timer circuit 1 and the switching circuit 2. This time setting circuit 3 includes two inverter circuits IV 1+ connected in series to the collector of the transistor Q1 of the switching circuit 2.
IV 2 and the time-limited low resistor VR connected via a diode to the output side of each inverter circuit ■vr, IV =
+, νR2, and a capacitor CI connected to these. The intersection of these time setting resistors VRr and VR2 and the capacitor C+ is connected to the terminal 2 of IC1d provided in the timer 1, as shown in FIG.

With this configuration, when the output TS of the timer circuit 1 is "II", the transistor 1 is turned on and the collector becomes IL L
ll, so the output of the inverter circuit IvI is 111
11. The output of the inverter circuit IV2 becomes L'''. As a result, the capacitor CI is charged from the control power supply (not shown in FIG. 1) via the time setting resistor VR+.

Therefore, by adjusting the value of the 1-time setting resistor VR+, the charging time of the capacitor C1 is changed, and the oscillation frequency of the timer circuit 1 is changed to adjust the duration when the switching signal TS is II II #1 to an arbitrary value. Can be set.

Similarly, by adjusting the value of the time setting resistor VR2, the time interval when the switching signal TS is 711 II can be arbitrarily adjusted and set.

At the output end of the switching circuit 2, a similarly configured 2
Two electronic volume circuits 4 and 5 are connected. As shown in FIG. 3, this electronic volume circuit 4 (or 5) is a commercially available IC (for example, manufactured by Kochu Denki Co., Ltd. LC7500) 4d. Transistors Q+ and 0, which are the output terminals of the switching circuit 2, are connected to the input terminals ■ and ■ of this IC4d.
2 collectors are connected.

The oscillation circuit 4C is connected to a capacitor C2 and a resistor R+s via a terminal O, and oscillates at a frequency determined by the values of the capacitor C2 and resistor R+s in accordance with the output of the control circuit 4a. The 5-bit output of the binary counter that constitutes the 5-bit up-down counter is connected to the IC terminal ■,
@> , 0. Connected to ◎ and ◎. On the other hand, those I
External resistors R5 to RI4 are connected to the C terminal, and the connection state of these external resistors R5 to RI4 is switched by a 5-bit output appearing in binary at terminals ■ to ◎. As a result, the voltage V+ at the output end of this resistance circuit changes in 32 steps. On the output side of this resistance circuit is an operational amplifier 4e,
An impedance conversion circuit consisting of 4f is connected.

In this configuration, when a signal 17L'' is input to the U (up) terminal ■, the control circuit 4a operates the 1st oscillation circuit 4c and sets the counter of the 1st circuit 4b to the up operation side.As a result, the 1st oscillation circuit 4C At the same time as oscillation is started and a pulse signal is output, the counter of the circuit 4b counts these pulses. Depending on this count value, the levels of terminals 1 to [phase] change as shown in Table 1 below. ( Margin below) Hama 1 The output voltage ! of the resistor circuit increases sequentially in 32 steps in response to changes in the voltage level appearing at the terminals 1 to 0.

On the other hand, when the signal 11L11 is input to the D terminal (2), the counter of one circuit 4b is set to the down operation side, and the output voltage v1 of the resistor circuit decreases sequentially in 32 steps.

This voltage v1 undergoes impedance conversion through operational amplifiers 4e and 4f, and is output as a control signal C3r (C32) for switching the input signal of the signal conditioning circuit 6.

This signal adjustment circuit 6 is a circuit that increases or decreases the level of the input signal IS+JS2 according to the increase or decrease of the control signal C5+ + C52, and outputs the increased or decreased level of the input signal IS+JS2.As shown in FIG.
, 6b (for example, Kochu Denki's L
A2600)6c.

With this configuration, for example, when the voltage of the control signal C5+ is 0 (v), the signal ISL input to the terminal ■ is narrowed down by the internal circuit 6a, and the output signal O5+ for broadcasting becomes 0. As the voltage level of the control signal C5+ increases, the attenuation amount in the circuit 6a decreases in the signal level of the input signal IS+, and the output signal O5+ increases, and when the level of the control signal C3+ becomes constant, the output also settles to a constant value.

By combining the above two operations and increasing one of the control signals C3I and CS2 and decreasing the other, the input signal IS
1. The outputs O5I and O52 of IS 2 are mutually switched.

Signals O5r and O52 output from the signal conditioning circuit 6 are mixed through capacitors Ca and C4,
The signal is applied to the power amplifier 7 via. Those signals are amplified there, and then passed through a capacitor C6 to have the DC component cut off, and then applied to the speaker 8.

On the other hand, the outputs C5+ and C5 of the electronic volume circuits 4 and 5
2 is also applied to switch circuits 9 and 10 having the same configuration.

These switch circuits 9 and 10 are composed of comparators Oa and 10a using operational amplifiers.
The outputs C31 and C32 of the electronic volume circuits 4 and 5 are
and reference voltage V2. VJ is compared. That signal C5r
*The signal level of C52 is the reference voltage V2. When V3 is exceeded, the outputs of switch circuits 9 and 10 SS + , SS
2 becomes "H", and the constant voltage power supply circuits 11 and 12 are activated.

Tape recorders 13.14, which are external devices, are connected to the output terminals of these constant voltage power supply circuits 11.12, and are supplied with power when the constant voltage power supply circuits 11.12 are activated. On the other hand, these tape recorders 13 and 14 are set in such a state that the playback button is pressed and the endless tape is pressed against the playback head so that the tape recorders 13 and 14 operate immediately when power is supplied. Further, the outputs of these tape recorders 13 and 14 are connected to become the input signal S+JS2 of the signal conditioning circuit 6.

Incidentally, in this embodiment, a signal forced selection circuit 15 is provided in order to forcefully select and output one of the broadcasting signals.

This signal forced selection circuit 15 includes a time limit setting resistor VR+.

Interlocks with VR2, always ON, resistor VRI, VR2+
7) Switch SW I that turns off when the value is narrowed down to 0
, 5w2 and.

Inverter circuits IVY and IV4 that change the output state by turning on and off these switches SW l and 3w2,
Turns on according to the outputs of these inverter circuits IV a and IV 4.

OFF L, transistor Q+ of switching circuit 2
.

Transistor Q3.02 forcibly turns ON and OFF. Q
4 and diodes DI and D2.

With this configuration, for example, if switch SW+ is turned off.

The input of the inverter circuit ■v3 becomes ``H'', and its output changes to ``L''. At this time, switch Sv2 is ON
Since the output of the inverter circuit IV4 is "+1", the transistor 04 is ONL, and the base of the transistor Q2 of the switching circuit 2 is therefore "1".
1'' and is forcibly turned on. Also, the base of the transistor Q+ is drawn to the output "L" of the inverter circuit IV3 via the diode DI, and is turned off regardless of the output of the timer circuit 1.

On the other hand, when the switch SWz is turned off, the output of the inverter circuit IV4 becomes Ill'''. At this time, the switch SW+ is turned on and the output of the inverter circuit IV3 becomes "Ill"'.
I+'', the transistor Q3 is turned on, and the transistor Q1 of the switching circuit 2 is turned on.
The base of the transistor Q2 is drawn to the output ``L'' of the inverter circuit IV4 through the diode D2, and is turned off.
do.

Next, the operation of this embodiment configured as described above will be explained with reference to the time chart of FIG.

First, set a CM (commercial) on the tape recorder 13 and a tape with B, G, M (background music) recorded on the tape recorder 14 in advance.

Furthermore, it is set so that it can immediately operate as long as power is supplied. In addition, the time limit setting resistor VRl of the time limit setting circuit 3
, adjust VR2, time to play commercials, n, G, M.

The duration of the flow is set in advance.

In this state, power is turned on to a device (not shown).

When the power is turned on, the timer circuit 1 is set so that the output TS is "L".As a result, the transistor 01 of the switching circuit 2 is turned OFF, the transistor 02 is turned ON, and the inverter IV2 output is rr It u. The oscillation circuit 1a in the timer circuit 1 oscillates at a frequency determined by the resistor VR2 and the capacitor C1.

On the other hand, as transistor 01 is turned off and Q: is turned on, an L''' signal is applied to the D terminal of the electronic volume circuit 4, gradually decreasing its output C5+.
When the power is turned on, the output C5+ of the electronic volume circuit 4 is 'O'.
'', there is no change. At the same time, U of the electronic volume circuit 5
A signal of 'L' is applied to the terminal, and its output C52 gradually increases to a predetermined voltage V, ).

At this time, the base P! in the switch circuit 9.10! Voltage V
2. Since V3 is set to a value close to 0 (v), when the level of the control signal C52, which is the output of the electronic volume circuit 5, exceeds the reference voltage v3, the output S of the switch circuit 10
52 becomes "It", and the constant voltage power supply circuit 12 operates. As a result, power is supplied to the tape recorder 14, which operates, and inputs the [1, G, M, and signals as input signals IS+ to the signal adjustment circuit 6. At the same time, as the level of the control signal C52 input to the signal adjustment circuit 6 increases, Th, G
, M, gradually increases the level of the output signal O32. This causes the speakers 8 to 1'3. G and M are broadcast so that they gradually become larger. At the time when the tape recorder 14 is switched to operate in this manner, B, G, and M from the speakers 8 are silent or almost silent.

During this time, the timer circuit 1 counts the oscillation pulses, and when the oscillation pulses reach a predetermined value, the output TS is set to rrIV.

Then, this time, transistor 1 of switching circuit 2
is turned ON and Q2 is turned OFF, so that the inverter I
The V+ output becomes #IIl+, and the oscillation circuit in the timer circuit 1 oscillates at a frequency determined by the resistor VR+ and the capacitor C2.

On the other hand, since the transistor Q1 is turned on and the transistor Q02 is turned off, the U terminal of the electronic volume circuit 4 becomes rt1.
rr and the output C5+ gradually increases, while the D terminal of the electronic volume circuit 5 becomes ``11'''' and the output C5+ gradually increases.
32 gradually decreases.

Due to this increase in the control signal C5+, the output SS+ of the switch circuit 9 becomes re It u, and the constant voltage power supply circuit 11
operates, the tape recorder 13 operates, and the signal is inputted to the signal adjustment circuit 6 as the CM double signal input signal IS2.

In the signal conditioning circuit 6, the control signal C5+ increases and C5
2, the input signal IS+ is increased, IS2 is decreased, and the output signal 052 is gradually switched to O3+.

As a result, the sound broadcast from the speaker 8 is +3. G.
Switches from M to CM. At the same time, the control signal C52 decreases and drops to near 0 (■), and the output SS+ of the switch circuit 9 becomes ``14'', stopping the operation of the constant voltage power supply circuit 11 and thereby driving the tape recorder 13. make it stop.

In this manner, the apparatus of this embodiment can alternately switch and broadcast tapes on which B, G, M, and CM are recorded at preset arbitrary time intervals. Further, the tape recorders 13 and 14 can be commercially available products without modification. As a result, B, G, M, and CM can be easily replaced with new ones, and broadcasts suitable for the customer group in the store can be easily selected and played at any given time. In addition, broadcast switching is performed smoothly by a fade operation, which leaves a good impression on customers.

Further, since the tape recorders 13 and 14 are driven only during broadcasting, unnecessary driving is omitted and the life of the tape and head is extended.

By the way, if it is desired to change each broadcast time while such broadcast signal switching is being performed automatically, the time can be freely changed at any time by changing the value of the time setting resistor V11+ or V112. Furthermore, if you want to broadcast only one side continuously, connect the resistor VR+ or VH.
2 all the way down and switch S1 or 5ll12 to O.
All you have to do is FF.

For example, if you want to stop the CM broadcast and only broadcast B, G, M, etc., reduce the resistor Vll+ to 0 and turn off the switch Sv+. Then, inverter circuit IVJ
The output of the timer circuit 1 changes to 'L', forcing the transistor Q1 of the switching circuit 2 to turn off via the diode DI, and forcing the transistor 02 of the switching circuit 2 to turn on via the transistor 04.As a result, the output of the timer circuit 1 changes to 'L'. Regardless of the case, the D terminal of the electronic volume circuit 4 and the U terminal of the electronic volume circuit 5 are 11 L 11
become. Therefore, the output C5+ of the electronic volume 4 is switched to decrease and the output C52 is switched to increase, so as mentioned above, the CM broadcasting signal O5+ is immediately switched smoothly to B, G, M, and broadcasting signal O32 by a fade operation. From now on,
From the speaker 8, only [3, G, M] are continuously broadcast.

On the other hand, if you want to stop broadcasting B, G, M, and only broadcast commercials, narrow down the resistor VR2 to 0 and turn off the switch S22. It can flow.

In the above embodiment, the input signal I of the signal conditioning circuit 6 is
Although an example is shown in which the outputs of the tape recorders 13 and 14 are used as the S+ and 152, the present invention is not limited to this. It is also possible to use an output signal from a device that is operating independently.

Further, the external device is not limited to a tape recorder, but a radio, a player, etc. can be used.

Furthermore, it is also possible to use an output signal from broadcasting equipment that operates independently of the present apparatus as one input signal of the signal adjustment circuit 6, and to use a lighting fixture or the like as an external equipment.

Further, the present invention is provided with a switch circuit that turns on and off a corresponding external device according to the output of the timer circuit. Although the output of the timer circuit 1 or the switching circuit 2 may be inputted, it is within the technical scope of the present invention.

Further, in the above embodiment, an example was shown in which two broadcasting input signals are switched and outputted, but the present invention can be similarly implemented in the case of switching between two or more input signals.

That is, FIG. 6 is a circuit diagram of a main part of a signal switching device according to another embodiment of the present invention showing one example thereof, and 21 is a timer circuit that sequentially outputs switching signals. 22A・・・・・・・・・2
2N is an electronic volume circuit, 23 is a signal adjustment circuit, 24
These are the electronic volume control circuit [4, signal adjustment circuit 6. It is configured similarly to the power amplifier 7.

With this configuration, for example, the U (up) of the timer circuit 21
The side output signal -IJS+ is 'L'' and the remaining signal US2~
USIj is "+1", and on the D (down) side, only signal O5+ is "++" and the remaining signals DS2 to DSr
+ is +lLj+, only the output C5+ of the electronic volume circuit 22A is LIIIH, the outputs C32 to C3lJ of the other 220 to 22N become "Ll+," and the signal adjustment circuit 23 outputs only the input signal IS+, and the power amplifier 24 In this state, the timer circuit 21 switches, and the U surveying force signal IJS2 of the timer circuit 21 becomes "B", and the rest becomes uH11°, and the D surveying force signal DS2 becomes "++". Assuming that the rest becomes "V", the electronic volume circuit 22A output C
5+ is '! , '', and at the same time, the electronic volume circuit 22 [1 output C52 increases to ``11''.
By narrowing down the output signal and gradually passing IS2, the output signal is switched from O5+ to O32 by a fade operation.

In this way, by sequentially switching the signals output from the timer circuit 21 at predetermined time intervals, the broadcast signal O5 output from the signal adjustment circuit 23 as shown in FIG.
+ to O5++ can be switched sequentially with fade-in and fade alignment.

(Go to I) Detailed Description of the Invention According to the present invention, the switching signal output from the timer circuit is input to the electronic volume circuit to output a control signal to increase or decrease, and this is input to the signal adjustment circuit. This is a convenient signal switching device that allows the switching of broadcasting signals to be performed smoothly and pleasantly, as well as allowing the switching time interval of the broadcasting signals to be freely set. will be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a signal switching device showing an embodiment of the present invention, FIG. 2 is a specific circuit diagram of the timer circuit in FIG. 1, and FIG. 3 is a specific diagram of the electronic volume circuit in FIG. Circuit diagram, Figure 4 is a specific circuit diagram of the signal conditioning circuit in Figure 1, Figure 5
The figure is a time chart of main signals to explain the operation of FIG. 1, FIG. 6 is a block diagram of the main part of a signal switching device according to another embodiment of the present invention, and FIG. 7 is the operation of FIG. 6. It is a time chart for explaining. 1.21...Timer circuit, 2...Switching circuit. 3...Speaker, 4,5.22A~22N...Electronic volume circuit, 6,23...Signal adjustment circuit, 7,2
4...Power amplifier, 8...Speaker, 9,10.
...Switch circuit. 11.12... Constant voltage power supply circuit, 13.14...
Tape recorder, 15... Signal forced selection circuit. Figure 2 Figure 3. Figure 4

Claims (3)

[Claims] (1) Time limit setting for setting multiple time limits in a signal switching device that sequentially switches multiple input signals and outputs them to a speaker, and also gradually increases and decreases two input signals at the same time to switch sounds when switching. a timer circuit that outputs one or more switching signals set by the timer circuit, and a plurality of electronic volume circuits that increase or decrease the output according to the switching signals output from the timer circuit;
A signal adjustment circuit that increases or decreases the output level of a plurality of corresponding input signals in accordance with an increase or decrease in the output of the plurality of electronic volume circuits, and an amplification circuit that amplifies the output of the signal adjustment circuit and outputs it to a speaker. A signal switching device characterized by: (2) The signal switching device according to claim 1, further comprising a switch circuit that turns on and off a corresponding external device according to the output of the timer circuit. (3) The device according to claim 2, further comprising a forced selection circuit that forcibly selectively outputs one of the plurality of electronic volume circuits regardless of the output state of the timer circuit. Signal switching device.