JPS642231Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a wireless device that serves as both a channel and an alarm, so its purpose is to be able to provide multiple channels at low cost, and to prevent interference depending on the intended use, especially as a transmitter for alarms. , a wireless device that eliminates the need for line wiring by making the transmitter wireless and provides ease of use and ease of use, as well as providing peace of mind to family members by eliminating false alarms. is to provide.

The wireless device of the present invention remotely controls a receiver using two channels of radio waves, and uses a sound generation circuit to make a chime sound or an alarm sound. This will be explained below using examples. Figure 1 shows the frequency allocation of the modulation frequency of the embodiment of the wireless device of the present invention, which is 15KHz±
The modulation frequency band is 5Hz, the range of 10KHz to 15KHz in this modulation frequency band is assigned as a channel for transmitting a notification chime, and the range of 15KHz to 20KHz is assigned as a channel for alarm transmission for crime prevention and fire prevention. FIG. 2 shows a circuit configuration diagram of the receiver 1 of one embodiment, where 1a is a super regenerative front end, 1b is a signal amplification circuit, and 1c ₁ and 1c ₂ are channels corresponding to the above modulation frequency assignments. These frequency identification circuits 1c ₁ and 1c ₂ identify whether the received signal is for chime or alarm at that frequency. 1g ₁ and 1g ₂ are level comparators that determine based on the level whether the signals identified by the frequency identification circuits 1c ₁ and 1c ₂ are noise or the relevant signal. 1d ₁ and 1
_d2 is a tone burst signal identification circuit that further identifies tone burst signals from the signals identified and obtained from the frequency identification circuits 1c ₁ and 1c ₂ . Reference numerals 1e ₁ and 1e ₂ are a chime sound generating circuit and an alarm sound generating circuit which operate based on signals output when the tone burst signal identifying circuits 1d ₁ and 1d ₂ identify the signal. 1f is a speaker drive circuit that drives the speaker 3 by an output signal from the chime sound generation circuit _1e1 or the alarm sound generation circuit _1e2 . The frequency identification circuits 1c ₁ and 1c ₂ have a circuit configuration as shown in FIG. 3, and include a coil L ₁ and a capacitor C _{1 .}
By varying the inductance of the coil _L1 , the resonance point of the resonant circuit formed by the coil L1 can be changed, and the modulation frequency for frequency discrimination can be varied. ₁ is set to 10KHz to 15KHz, and alarm frequency identification circuit 1c ₂ is set to 15KHz to 20K.
Hz to ensure that the modulation frequencies are never mixed. FIG. 4 shows a circuit configuration diagram of a transmitter 2 according to an embodiment of the present invention, which has an oscillation circuit 2a that oscillates a tone burst signal and an oscillation circuit 2b that oscillates a signal frequency. The output signals of the oscillation circuits 2a and 2b are connected to the NOR circuit 2c.
A modulation signal is obtained by performing a NOR gate at the oscillator circuit 2d, and this modulation signal is superimposed on the carrier wave oscillated by the oscillation circuit 2d.
The signal is transmitted as a radio wave via an antenna 2e, and the oscillation circuit 2a oscillates a signal of about 100Hz, and the oscillation circuit 2b varies the oscillation frequency by varying the inductance of the coil _L2 . For example, transmitter 2 of channel for chime ₁
In this case, the variable range is 10KHz to 15KHz in accordance with the allocation, and in the case of the alarm channel transmitter ₂₂ , the variable range is 15KHz to 20KHz. Thus, the transmitters 2 ₁ , 2 ₂ and the receiver 1 are each tuned to a modulation frequency that does not interfere with, for example, adjacent wireless equipment within the frequency range assigned to each particular channel.

Now, when the chime transmitter ₂₁ is operated in FIG. 5, radio waves modulated with a signal set within 10KHz to 15KHz are transmitted. This transmitted signal is received and reproduced by the front end 1a of the receiver 1, then identified by a chime signal frequency identification circuit 1c ₁ set to an identification frequency corresponding to the transmitter 2 ₁ , and further by a level comparator 1g ₁ . The tone burst is identified by the tone burst identification circuit 1d1 through the tone burst identification circuit _1d1 , and the chime sound generating circuit _1e1 is operated to generate a chime sound from the speaker 3.

When the alarm transmitter 2 ₂ is operated, the transmitted signal is received and reproduced by the front end 1a of the receiver 1 in the same manner as described above, and then the alarm signal frequency set to the identification frequency corresponding to the transmitter 2 ₂ is transmitted. The tone burst signal is identified by the identification circuit 1c ₂ and further passed through the level comparator 1g ₂ to the tone burst signal identification circuit 1d ₂
The tone burst is identified, the alarm sound generating circuit _1e2 is operated, and the speaker 3 emits an alarm sound.

As described above, the present invention is composed of a receiver and a transmitter that have frequency assignments that divide the modulation frequency according to usage, so even if many similar wireless devices are installed, interference will occur depending on the usage. Furthermore, since frequencies are allocated according to application, it has the advantage of being able to be installed in multiple channels at low cost.Also, as mentioned above, it can be configured as an alarm transmitter, a chime transmitter, and a receiver. Therefore, even if the installation location is completely different, such as a push button at the entrance and a fire detector on the ceiling, one receiver can be easily used because no special line is required. The position can be set arbitrarily as long as it is within the reach of radio waves, so it has the advantage of being able to adapt to the installation site situation.It also has the advantage of being able to perform not only frequency identification, but also double and triple identification, such as tone burst signal identification and level verification. Since it uses false alarm elimination means, it can extremely reduce the risk of false alarms caused by interference and external noise, which are common in wireless radio wave systems.In particular, since it uses a tone burst signal identification circuit, it can The notification signal from fc + fMOD10KHz + fT.B100Hz,
And if it is a square wave, fMOD10KHz is Af10KHz+
Even if the corresponding harmonic component, which contains Fourier series harmonic components such as Bf20KHz+Cf30KHz..., is identified by the frequency identification circuit that selects the signal, it can be reliably blocked by the tone burst signal identification circuit, The advantage is that high reliability can be added to the above-mentioned convenience by reliably preventing the above-mentioned false alarms and eliminating the alarm sounding (or failure) due to false alarms that cause anxiety to family members. has.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of frequency allocation according to an embodiment of the present invention, Fig. 2 is a circuit diagram of the same receiver, Fig. 3 is a specific circuit diagram of the same frequency identification circuit, and Fig. 4 is the same transmitter. FIG. 5 is a diagram for explaining the use of the same as above, 1 is a receiver, 1a is a front end, 1c ₁ and 1c ₂ are frequency discrimination circuits, 1g ₁ and 1g ₂ are level comparators, 1d ₁ , 1d ₂ is a tone burst signal identification circuit, 1e ₁ and 1e ₂ are a chime sound generation circuit and an alarm sound generation circuit, respectively, 2 ₁ and 2 ₂ are transmitters, and 3
is a speaker.

Claims (1)

[Scope of utility model registration request] A chime transmitter that transmits a tone burst modulated signal on a carrier wave as a radio wave, and a tone burst modulated signal having a frequency different from the frequency of the modulated signal of the chime transmitter on a carrier wave and transmits it as a radio wave. a frequency identification circuit for chime and alarm that extracts and identifies each of the modulated signals from the signals received and extracted by the front end, and outputs from both frequency identification circuits provided correspondingly to both frequency identification circuits. A level comparator that tests the level of a signal to determine whether it is the signal or noise, and a tone burst signal identifier that is provided corresponding to each level comparator and identifies the tone burst signal of the signal that has passed through each level comparator. an alarm sound generation circuit and a chime sound generation circuit which are respectively provided corresponding to the tone burst signal identification circuit and are driven by the output of the tone burst signal identification circuit; A wireless device consisting of a receiver consisting of a speaker for reproduction, and a receiver.