JPS58103238A - Radio device - Google Patents

Abstract

PURPOSE:To prevent useless power consumption to save the power consumption while the reception is on stand-by, by varying the start timing of a power supply to a demodulating circuit in response to the detected voltage after detecting the power supply voltage and by shortening the supply time of voltage in case the demodulating circuit has a quick response with a high level of power supply voltage. CONSTITUTION:A radio device is provided with a signal transmitter which transmits call signals for a prescribed period of time from the application of a call switch and a signal receiver which receives intermittently the call signals with a period shorter than the prescribed period of the call signals. A detecting circuit 16 for power supply voltage is connected to a power supply controlling part 15 of the signal receiver to detect the power supply voltage V. Then the reference voltage is compared with the voltage V by a comparator 18 of the circuit 16. When the detected voltage V is low, the start timing is accelerated for the power supply to a demodulating circuit 9 from the controlling part 15. While the start timing is decelerated when the voltage V is high. Thus the useless power consumption is suppressed to save the power consumption while the reception stands ready.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to wireless devices such as wireless intercoms. FIG. 1 shows a schematic configuration diagram of a conventional wireless device such as a wireless interphone of this type. In the figure, A%B indicates each station, and each station is equipped with a transmitter (1) and a receiver (2), so that communications can be transmitted between stations A and 8. Transmitter] 1) includes a telephone microphone J (3), a low frequency amplifier (4), a modulation circuit section (6), a transmission output section (6), and a call switch (7) consisting of a push button switch. , this call switch (
7), and a calling signal generating section (8) which generates a calling signal for a predetermined period of time from the input of the calling signal generating section (8). - force receiver (
2) consists of a front end section (!barrel, demodulation circuit section (9), and low frequency quadrupler-10), and a ringing signal detection circuit section (litter, ringing signal detection circuit section) that detects the demodulated calling signal. It is composed of a notification circuit unit u2 which operates according to the output signal of the circuit unit (It) and generates a notification word, a speaker 114), and a power supply control unit for reception operation.

Next, the operation of the conventional wireless device during standby will be described.

If you follow the receiver 1 + 21 r; and receive the A11 operation money, if you are using one other source, the consumption of foaming will be wasteful, so the tjt source cositrol muri no plow Raki V
From this, when the call signal of the transmitter (1) shown in Figure 42 (1)) is sent, it operates intermittently in a short period shorter than the sub-r2 when the call signal is sent. The m source VA is supplied to the demodulation circuit section +91, which is slow, as shown in Fig. 42 (d), and after 7, the power supply VB is supplied to the circuit section - - t131, where the rise is fast, for a short time as shown in Fig. 42 (e). ``The second figure (
The intermittent reception operation is performed as shown in C).

Then, as shown in Fig. 2 (a), when the call switch (7) is turned on at a certain tie 3'J @ A's 1g device 11) vc, only 1 time T2 is called from that turn on. A discharge signal is generated from the signal generator (8) as shown in FIG. Ru. On the other hand, the period T1 of intermittent reception of VGO on receiver 1g device (2) of partner station B
is shorter than the time T2, so the call signal is always received at 1g during the branch IM operation.
Then, a calling signal is detected as shown in FIG. 2(f), a detection output thereof is generated, and a notification signal is outputted from the notification circuit section X1'4, thereby performing notification as shown in FIG. 2(g). Station B, which received the call in this way, uses its own transmitter II.
) is used to transmit a call to the other station A, and conversely, the other station A also sends a call. Needless to say, in this case, the carrier frequencies tl- of the respective transmitters +xl are made different to enable simultaneous calls without interference, or mutual calls are made nine times in a so-called two-to-one system. In the figure, ++1 is a receiving antenna.

By the way, the 41st tone circuit section (9) uses the power supply VA in the time span of PA.
However, its response is dependent on the power supply voltage, and when this demodulation circuit section (9) is driven by battery power, the response time at low voltage, which has the slowest response, is The time width PA (!-) is determined by .Therefore, in places where the voltage of the power supply v# is important and the response is relatively fast, the time width PA is too long and there is often no output power.

The present invention has been made in view of the above-mentioned problems, and its purpose is to vary the power supply period to the demodulation circuit section according to the input signal If during intermittent reception operation during standby mode.
, to provide a wireless device +tt- which further reduces direct power consumption.

The present invention will now be explained using real tj4 sequences. Figure 3a is a diagram showing the responsiveness of the rising pressure of the integrated pressure and the demodulation circuit section (9).
It can be seen that there are points where the start-up response time is considerable between the combination and the multi-stage. Therefore, when the pressure of the power supply V of the present invention is low, the weight reduction circuit section 1111Ic is distinguished from the AV.
The supply 1 start timing of A is made faster to increase the high supply period 1 period PA, and conversely, the power supply V pressure is controlled and the delay a is made to shorten the supply period + ii'lPA, and the power supply V ( I think it's designed to suppress the consumption of 4 when the pressure is high.
As shown in the figure, the receiver (2) was provided with a source voltage/production circuit end for producing the #Ic source Vt pressure, and was added in advance with a Zener diode (7). 4 嬶some pressure 'Jref and the source v
The detection output is set to "H" when the tIL voltage is compared with the cosiparator state and the dIL voltage is higher than the direct voltage quasi-voltage vref.
I/I/bell, and conversely, if it is low, is the detection output? The power supply controller 111 is set to L level, and the power source
51151 operates to change the supply period PA of the power supply VA supplied to the demodulation circuit section (9).

Next, the operation of the receiver (2) during standby in this embodiment will be explained based on FIG.

Fig. 5(C) shows the lt source V voltage formation, and when this direct voltage is higher than the reference voltage vref, the comparator i+7) of the power supply voltage detection circuit section α is detected as shown in Fig. 5(d). Therefore, the supply period PA of #t#vA, which is supplied to the 41st tone circuit section 9) via the adult pig control section 9), is at the output rf'H level. is set and is intermittently supplied at a predetermined period T1 as shown in Figure 45(e).On the other hand, the voltage is supplied to other circuit sections (l(2) to terminals as shown in Figure 5(f) regardless of the power supply V voltage). It is supplied for a predetermined period shorter than the period PA1 and delayed from the rise of the supply period PA1.When the power supply v'm voltage becomes lower than the reference voltage vref, the detection output rt''L of the cossiparator α→
The power source control unit ll5) adjusts the power supply VA supply period PA to the demodulation circuit unit (9) as shown in Figure 5(e).
PA shown in the second half of the figure is set to be long to ensure that a receiving operation can be obtained without compensating for the delay in the rise of the response of the demodulation Lg circuit section (9) due to a decrease in the power supply V voltage. In Fig. 3, the ◎ line indicates the relationship between PAl, the period of PAl, and the power supply V voltage.

In order to obtain the same circuit as the one shown in the figure, the details of 10 will be omitted. 57 (a) shows the turning on of the call switch (7), and FIG. 5 (b) t/! Discharge 1
100, and Figure 45 (g) shows the number 1 of the call signal production circuit section 11), and Figure 5 (fl) d cut.
Shows No. 1g.

f + = j In the above embodiment, for the sake of explanation, the power supplies supplied to each circuit are the power supplies VA and VJ3, but the pressure of these power supplies VA%Vi3 is lowered accordingly. It can be considered that 1av=et miscellaneous VA, VB. In addition, in the upper d pi implementation row, there are a total of two stages of switching between the output # and the 91-speed PA, but it would be better to have multiple stages, or it may be possible to have one stage without stages.

The invention is constructed as described above, and has a region source pressure detection circuit that detects the source pressure, and when the 11E source pressure produced by this ζ source pressure detection circuit becomes low, it is sent to the demodulation circuit. Since the power control unit is equipped with a receiver that has a function to change the period of IE power supply to the demodulation circuit unit by making the tie-break at the start of power supply faster and the delay at the start of the power supply, the power supply control unit is equipped with a receiver. When the power supply voltage is high, it is possible to shorten the power supply period to the r+ demodulation circuit section to suppress wasteful power consumption, thus reducing power consumption during the reception and 1g standby periods. Furthermore, even if the source pressure becomes low, the period 1I111 of supplying the source to the demodulation circuit section is lengthened, so that a reliable reception operation can be obtained.

[Brief explanation of the drawing]

Figure 1 is a circuit block diagram of a conventional example, and Figures 42 (a) to (g).
43d is an explanatory diagram of the principle and embodiment of the present invention, Figure 4a is a circuit block diagram of the main part of the embodiment of the present invention, Figures 5(a) to (h)v ′
i Same as above for operation explanation time chart i=-B times・ill
v transmitter, ', -z) receiver, 17) d call 1
g@Generation part 1, to) d 't (II Coy F
OII/g, V, VA, VBrihuk It source,
PA%l'A□, PAl, and PBμ are the source supply periods, respectively. Agent Patent Attorney Naga Ishi 7 Figure 2 Figure 3 also fl Melon Figure 4

Claims (1)

[Claims] ;1) A transmitter that transmits a call number 1d for a preset period of time after turning on the call switch; A power source that first supplies power to the demodulation circuit section, which has a relatively slow response when power is applied during reception, and then supplies power to other low-frequency quadrupole circuit sections that have a quick response. The wireless device has a dt source pressure detection circuit that detects source pressure, and if the IIcIc pressure voltage detected by this power source 1 pressure acclimatization circuit is sent to the demodulation circuit section. 111 The receiver is equipped with a power supply control unit that has a function to change the power supply period to the demodulation circuit w and power supply by making the power supply start speed faster and the power supply start slower. A wireless device on standby.