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DESCRIPTION JPS5743681

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DESCRIPTION JPS5743681
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing a conventional
single ultrasonic transducer, FIG. 2 is a circuit diagram showing a transmitter side circuit of the
present invention, and FIG. 3 is a receiver side circuit. Circuit diagram shown, FIG. 4 ? is a
waveform diagram showing the oscillation waveform of the transmitter, FIG. 4 ? is a waveform
diagram showing the collector potential of the transistor Q4, FIG. 4 ? is a waveform diagram
showing the collector potential of the transistor Q3 4 is a waveform diagram showing an output
signal of a detection circuit (not shown). 9.10
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WIO / ION heat T-m-] heat IG-64131; 10 B [: Z] 1-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
transmitting and receiving apparatus which makes use of the simplicity of a single ultrasonic
transmitting and receiving apparatus and prevents malfunction due to external noise. The
transmitting and receiving apparatus using ultrasonic waves is, for example, an ultrasonic remote
control apparatus (hereinafter referred to as "remote control") capable of remotely performing
operations such as reception channels, volume, and power interruption in a television receiver. It
is used for). That is, the transmitter side is small and handy, and when the operator presses the
control / adjustment switch, ultrasonic waves can be transmitted, and the receiver side is
incorporated in the main unit of the television receiver. By receiving the above-mentioned
ultrasonic waves, the built-in circuit is operated to perform channel selection of the television
receiver and the like. Conventionally, for ultrasonic waves transmitted by an ultrasonic remote
controller, a single-ultrasound system for transmitting a single frequency carrier wave and a
plurality of carrier wave oscillators are set, and these are shifted by a 2-modulation signal to
change the oscillation frequency There is a frequency shift method or the like. The single
ultrasonic remote control has an advantage that the circuit is simple, but has a disadvantage that
it causes a strange malfunction due to the innumerable foreign ultrasonic noise existing around
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the television receiver. On the other hand, the characteristics of the frequency shift system are:Although malfunctioning against external noise can almost be avoided, the circuit becomes
complicated, a dedicated IC is needed, and the cost becomes high. There was a disadvantage that
I would ask. For this reason, despite the aforementioned drawbacks, a single ultrasonic remote
control is often used. An eleventh is a block diagram showing a conventional single ultrasonic
transmitting and receiving apparatus. In this figure, the transmitter 1 comprises an ultrasonic
transducer or a semiconductor ultrasonic oscillation circuit, and a switch and a speaker 2 for
operating the oscillation circuit, and transmits a single carrier wave of A (K) I, shown in the
figure. Let's do it. On the receiving side, the output terminal of the microphone 3 is connected 3to the amplifier 4 and connected to the pace of the transistor 6 via the tuning circuit 5. The
emitter of the transistor 6 is grounded via a parallel circuit of a resistor 7 and a capacitor 8. The
collector of the transistor 7 is connected to a power supply terminal via a resistor 9 so as to be
supplied with an electrolytic voltage V. On the transmitter side, the A (KH ultrasonic wave)
transmitted by the microphone 3 is input by the microphone 3, and the tuning circuit 5 having a
single characteristic of A (KH,) is tuned via the amplifier 4. The transistor 6 constitutes a single
switching circuit, and turns on when it is synchronized with the ultrasonic wave of the A (KH,) to
charge the capacitor 8.
When the input ultrasonic waves disappear, the capacitor 8 discharges. The output terminal OUT
outputs the above detection signal and inputs this detection signal to a flip flop circuit (not
shown), and stores that the signal of A [KH is received. The stored signal is switched when the
channel selection circuit is driven, and the volume adjustment is performed when the storage
adjustment circuit is driven. 4- However, in this circuit configuration, for example, when the
frequency component of PC, A [K) i] is included in the frequency component of external noise
such as the bell sound of a telephone, the key sound of a door, etc.! There is a disadvantage that
the noise synchronizes with the tuning circuit and malfunctions. In order to prevent this, it is
necessary to develop a dedicated IC for the frequency shift method r-similar to the loading wave
count method described above. However, this IC has a disadvantage that it is low in versatility
because it operates in the ultrasonic band, and it is expensive even if it is small in quantity. The
present invention has been made in view of the above-mentioned point, and by transmitting and
receiving ultrasonic waves different in two frequencies, the circuit configuration is simple and
malfunction due to external ultrasonic noise It is an object of the present invention to provide an
ultrasonic transmission / reception product that has Hereinafter, the present invention will be
described based on FIGS. 2 to 4. 2 and 3 constitute an ultrasonic transmitter that outputs the
output of the oscillation circuit by the speaker 2 in transmission and two tuning circuits that are
synchronized with the signal on the transmission side 5- Equipped with nine transmitters. On the
transmission side, one pole of the switch 10 is grounded, and the other pole is configured to
operate the oscillation circuit formed by the transistor Q1 by conduction of the switch 10
connected to the negative electrode of the power supply voltage E. The positive terminal of the
power supply voltage E is connected to the emitter of the transistor Q1 and the control terminal
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12 of the switch 11. The switch 11 is disposed so as to be grounded after a predetermined time
has elapsed, which is a capacitor C1 connected to one pole of the switch 11 when the control
voltage is supplied to the control terminal. The capacitor C1 is connected to one end of an
oscillation tuning circuit consisting of a parallel circuit of an inductance L1 winding and a
capacitor C2, one end of the capacitor C2U is grounded, and the tap 13 of the inductance L is
also grounded. Primary winding tab 14a of the inductance L1) is connected to the collector of the
transistor Q1, the same pace being the other end of the inductance L1 and the winding Km in
series via a capacitor C3 and resistor R in series.
Further, the base of the transistor Q is grounded via the resistor R2, and the secondary winding
of the inductance L1 is provided with a coupling coil, one end of which is grounded, and the
other end of the resistor R3. And a speaker 2 and a ground circuit. On the receiving side shown
in FIG. 3, the ultrasonic wave received by the microphone 3 is amplified by the amplifier 4 and
this amplified output is input to the pace of the transistor Q2 through the coupling capacitor C4.
And, the emitter of the transistor Q2 is grounded, and the collector is connected to the tuning
coil: ', I, go-winding 0 middle' '1' at both ends of the primary winding of the 1 и 6 same-phase
adjustment coil L2. The tuning capacitor C5 is connected in parallel to form a closed circuit, and
the second tuning circuit, which is a first tuning circuit, has a tuning capacitor C6 connected in
parallel across the primary winding of the tuning coil L3. The first tuning capacitor C1 is
connected to the middle tap of the tuning coil L3 and the connection point of the primary
winding of the tuning coil 2 is connected to the middle tap of the tuning coil L3. The two tuning
circuits are connected to a power supply terminal 7- for supplying a power supply voltage s via a
resistor R4. The secondary windings of the tuning coils L2, t, 3 have one end connected to the
power supply end. The other end of the secondary winding of the coil L2 is connected to the base
of the transistor Q3 via a diode D, and is connected to the base of the other end of the secondary
winding Q4 of the coil L3. The collector of the transistor Q3 is connected to the charge /
discharge circuit formed by the resistor R5 and the capacitor C, and the resistor R5 and the
capacitor C are grounded. The charge and discharge circuit of the transistor Q4 is formed by
connecting a resistor R6 and a capacitor C8 in parallel. The emitters of the transistor Q3 and the
transistor Q4 are connected to the power supply terminal. The collector of the transistor Q3 and
the collector output terminal of the transistor Q4 are connected to a detection circuit (logical
AND circuit) 15, respectively. FIG. 4 is a waveform diagram showing each output waveform of the
circuit described above. That is, FIG. 4 ?) is an output waveform of the transmitter of the
company. Time T well switch (SW) IQ ONK well 8- ,! It is shown that the transmission output is
transmitted at a frequency of D and A (KH, and the time T is determined by the switch (SW) 110
time constant. Further, it shows that the oscillation frequency changes to the oscillation
frequency B (KH,) in the period T2 and the oscillation of 0FFK of the switch (SW) 1G stops.
FIG. 4 shows the collector output waveform of the transistor Q4. Incidentally, the symbol & squ;
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indicated by a waveform arrow indicates the threshold level of a detection circuit (not shown).
FIG. 4 shows a collector output waveform of the transistor Q3. FIG. 4 (Ikl) is an output waveform
of the AND circuit 15. The vertical axis of each waveform except the same figure (1) shows
voltage, and the horizontal axis shows the time which is synchronized. The thin line indicates the
ground level, and the dashed line indicates the power supply voltage level. The operation of the
ultrasonic transmitting and receiving apparatus having the above configuration will be described.
When the switch 10 is turned on by the operator, the transmitter is driven at the natural
frequency A (KH,) determined by the amplification function of the transistor Q1, the coil L and
the capacitor C. After the switch lO is turned on, the switch 11 is turned on when the interval T1
elapses, as determined by the switch 11, and the capacitance of the capacitor C2 is added in
parallel with the time constant of the tuning circuit to determine the frequency of the oscillator
circuit. The frequency changes to B (KM,). Then, when the switch 10 is turned off, the oscillation
of the oscillation circuit is stopped (see FIG. 4 ?). If the change of the ultrasonic frequency
transmitted from the speaker 2 on the transmitting side is received by the microphone 3 on the
receiving side, the amplifier 4 amplifies the received wave. The amplified signal A (KH,) is tuned
to the tuning coil L3 and the amplification circuit of the capacitor C6 and the transistor Q2 to
turn on the transistor Q4. When the transistor Q4 is turned on, the capacitor C8 is supplied with
the power supply voltage 11, and the capacitor C8 is charged. When the transmission wave
changes from A (KH,) to B [KH,), the signal of B (Kn) is tuned to the other tuning circuit (coil L2,
capacitor C5, transistor Q2) and transistor Q3 On d. Capacitor C7 is charged. At this time, the
collector potential of the transistor Q4 gradually decreases because the capacitor C3 has already
started to discharge 10-with the time constants R and CB when the oscillation of A (KH,) is
stopped. However, the charging time of the aforementioned capacitor C7 is Ca:> C ,. R5) Since
each constant is selected to be R5, the charging voltage of the capacitor C7 rises at once, and
forms the logical product output of the AND circuit 15 in conjunction with the attenuating
collector potential of the transistor Q4. Can. Further, by inputting this output to a signal holding
circuit such as a flip flop, it becomes possible to hold the signal, and the above-mentioned
channel selection or volume adjustment can be remotely controlled by the transmitter.
Although the present invention has described one system of unit circuits, it is a theory that a
plurality of systems of practical circuits can be configured by setting a plurality of units in this
circuit configuration. As described above, according to the present invention, although the circuit
configuration of the single ultrasonic transmitting / receiving apparatus is to take a logical
product with two frequencies, it has the ability to prevent the receiver from malfunctioning due
to extraneous noise. effective.
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