JPS59140728A - Wireless interphone system - Google Patents

Abstract

PURPOSE:To evade channel interference by allowing a master equipment to select a free channel when a talk becomes unclear owing to interference, etc. CONSTITUTION:When the call button 29 of a slave equipment 2 is pushed, a frequency channel fA6 is sent out with a carrier. The master equipment 1 receives the channel fA6 and generates a ringing tone. In this case, when channels fA6 and fB6 are engaged by other interior interphones, the master equipment judges an interference state, so a channel change button 13 is pushed. Then, a channel change signal generator 14 operates to send out the channel fB6 with the carrier. The slave equipment 2 receives this signal and a PLL synthesizer 32 changes channels through a channel change signal detector 31 to obtain a frequency channel fA7. The master station 1 performs signal processing by a PLL synthesizer 14 and changes channel setting to obtain a channel FB7.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field [0001] The present invention relates to a wireless intercom system for wirelessly communicating between a parent ship and a baby sac.

[Background technology] The conventional wireless intercom system is
When a call is being made on frequency channels fA6 and fB6 between the parent ship (la) and the child's sac (2a) in one's own house or the neighbor's house, there is a setting at the entrance that sends an eli sharp device to the child's sac (2b). (1b) is called, frequency chi 17 cine fA6,
There was a problem in that when a call was started using fB6, there was crosstalk and a call failure occurred. In addition, the subscript AI/'i of the frequency channel represents the frequency, 6 represents the channel, l fA-fBl = 10.7 MHz, and the second
As shown in the figure, there is V'''C.

[Object of the Invention] An object of the present invention is to avoid channel crosstalk so as to enable clear communication.

Disclosure of the Invention] In FIG. 5 of the embodiment, tl+ is the parent ship, which transmits the output of the transmitter (3) through all the antennas (4) to the ascus (2), and also receives the input from the antenna (4). The signal is received by the receiving section (6), and is configured as shown in FIG. In the gX4 diagram, (6) is the AF intensifier, (7) is the modulation circuit, +81
Vi output circuit transmits the output of the microphone (9) through the antenna (4) as a signal with frequency fB (60MB2) to preheating (2), and transmits the output from preheating (2) to frequency fA(
70-T MHz) is received through the antenna (4), the front end (lO) and the AF amplifier (111
After converting the frequency and amplifying the signal, the speaker Q21 emits the c-d audio. The state is the channel change button, when you need to change the frequency channel, close the manual switch and operate the channel change signal generator (+41) to generate the channel change signal (
For example, 20 KHz) is generated and sent to preheating (2).

θ5) is a PLL synthesizer, and channel setting section 06
) is determined by the input and internal settings, and the output fB=Mxf8 is generated by multiplying the reference frequency &f8. At the same time, by turning on the channel change button (131), the channel change signal causes the CPU etc. to change the numerical value M to M+l, M+2, etc.
・・・・・・If we take M + n, then fB=M
f8+n Xf, is n;l, 2... [...
・It occurs in This allows sequential channel changes. Oη is a ringing signal detector which detects the ringing signal Ji+(lOKHz)' (r) from the preheater (2) and generates a ringing sound from the speaker (13) via the ejection sound generator α8. Next, in Fig. 5, preheating (2) is performed by receiving a signal from antenna 09) at a receiving section (incorporated) and passing the output of the transmitting section (21) through the antenna (+9).
1), and is configured as shown in FIG.

In Figure 5, (23) is the front end, and (23) is the AF
With the amplifier, the signal from the device (1) (fB = 60 M
Hz) k Antenna Q9) T- is received, the frequency is converted and amplified, and the sound is emitted from the speaker (24). 12
Hitoshi is the AF amplifier, N6) is the modulation circuit, (2) is the output circuit, and the output of the microphone is passed through the antenna (+9)' and output as a signal at the frequency (70,7 MHz). Send to. 9) is a call button, and when calling the machine (1), manually close it and press the call signal generator +301'
The r-off operation generates a calling signal (for example, 1 OKHz) and transmits it to the machine fi+. (3I) is a channel change signal detector which detects the output (20 KHz) signal of the channel change signal generator of device (1) and inputs the channel change signal to the PLL synthesizer. PLL syntt
For Izaso, the numerical value N is determined by the input of the channel setting section (83) and internal settings, and the output fA =
Nxf8 occurs. Also, depending on the channel change signal, the CPU etc. changes the numerical value to N+1, N+2, etc.
If we make N+n, fA=N X fs ten n X f
B occurs when n=1.2. This makes it possible to change channels sequentially.

Operation When a visitor presses the call button 9) for C preheating (2),
The output of the calling signal generator (2) is placed on the carrier wave to generate fA.
6 is emitted. fA6k for equipment (indoor unit) (1)
A ring signal detector (17) detects the 9 calls and generates a ring tone. When the Niji people were defeated by this ringing tone, fA
6. If the fB6 channel is in use, for example, through the indoor intercom of the house, the person who hung up the receiver of the device (1) will be able to hear the interference, so press the channel change button (+3) and press the channel change button (+3). Channel change signal generator α4)
After full operation, fB6 is radiated by putting the output on a carrier wave, and in preheating (2), this signal is received and the channel is changed by PLL synthesizer □□□ via channel change signal detector t311, resulting in fA7. Further, in the fi+, the signal is processed by the PLL synthesizer (15) and the channel setting is changed to become fB7. After that, the equipment fi+
If the person holding the receiver determines the call status of channel σ) and there is some interference due to rAt and fB7 being in use at Shun's house, etc., the person holding the receiver will press the channel change button 95 again.
Change the channel using the same process by pressing 'A
The call starts with s and fBa, and if the call is good, the call goes straight into the call state.

[Effect of the Invention 1 As described above, the present invention allows the equipment receiving a call from preheating to select an empty channel when the call is unclear due to crosstalk, so channel crosstalk can be avoided and clear calls can be made. This has the effect of making it possible.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a conventional wireless intercom system, Fig. 2 is an explanatory diagram of a general frequency channel plan, Fig. 5 is a circuit diagram of an embodiment of the present invention, and Fig. 4 is a diagram illustrating a general frequency channel plan.
The figure is a block circuit diagram of the same equipment as above, and the figure %5 is a block circuit diagram of the same as above. +l+...Parent separation, (2).Child separation, (13j...CH1 channel change button, 04)...Channel change signal generator, (]5)...PLL synthesizer, l)... - Channel I M'ke detector, Cl2) - PLL synthesizer. Agent Patent Attorney Ishi 1) Ai Figure 73 Figure 4 Figure 5

Claims (1)

[Claims] (11) A parent ship having means for generating a signal for changing the ascus channel and means for changing its own channel;
The parent ship is equipped with a parent ship having means for detecting a channel change signal from the parent ship and means for changing the channel according to the channel change signal VC, and is equipped with a parent ship that receives a call from the parent ship. A wireless intercom system 0 characterized in that a channel can be selected when a call on a ship is unclear due to interference etc.