JPS59111439A - Receiver having circuit saving power at stand-by - Google Patents

Abstract

PURPOSE:To eliminate an unreceivable state by operating a carrier detector when the power supply is connected and disconnected and connecting the power supply by the operation of the detector. CONSTITUTION:A full CH carrier detector 9 sweeps frequencies of CH1-CHN to detect whether or not a carrier is incoming to each CH, and when the carrier is incoming, a control signal is outputted to connect a power supply for the said CH circuit. That is, since the control signal to each CH is shorter than t7/N where t7 is one sweep time of the CH1-CHN of the full CH carrier detector, a signal inputted from a control signal input terminal 602 at the CH1 is kept till the incoming of the control signal after the next sweeping by a holding circuit 611 to control a power supply connecting and disconnecting switch 223 so as to connect the power supply.

Description

[Detailed Description of the Invention] The present invention provides a receiving device having a function of receiving multiple carrier waves with a common device and then independently demodulating each carrier wave, and more specifically, reducing power consumption during standby. The present invention relates to a power saving type receiving device.

Reducing wasted power in line systems such as transmitters and receivers has become a major challenge.

A method of transmitting a carrier wave only when a transmission signal exists in order to save transmission power, the so-called Voice Activ
ation (VA) method has conventionally existed. In a receiver that receives such intermittent carrier wave signals, if the carrier wave is cut off and the receiver is on standby, if power is not supplied,
Accordingly, 7-1 electric power can be saved.

In recent years, single-signal, single-carrier communication (Singl Channel Per Carr) has been frequently used in satellite communication.
This will be explained with reference to the drawings, taking as an example the 5 CPC (IER or lower) system.

FIG. 1 is a system diagram of a conventional power-saving receiver.

In Figure 1, numeral 1 indicates a common circuit up to the branch circuit of the receiver, and numeral 2 indicates a circuit that extracts a designated carrier wave from an intermediate frequency signal, demodulates it, and obtains a voice band signal.

314 has the same circuit configuration as 2, but each separately post-tunes a different designated carrier wave.

2.3.4 respectively for channel 1 (CHI) circuit,
Channel 2 (CH2) circuit, channel 3 (C)
(3) This will be referred to as the circuit for use.

The number of received carrier waves, that is, the number of channels in Figure 1 is 3.
Although two cases are shown, the actual system configuration depends on the system configuration, and there are many cases where the number of channels is 100 or more.

5 is a power supply circuit, common circuit 1 channel circuit 2.3
．． It is connected to each part of 4.

A plurality of carrier waves of the received signal arriving at the antenna are commonly amplified by a high frequency amplifier 11 and input to a mixer 12 . The other input signal of the mixer 12 is the output signal of the local oscillator 13, and the mixed output signal becomes a first intermediate frequency signal, amplified by the intermediate frequency amplifier 14, and input to the branch circuit 15. The branch output of the branch circuit 15 is
Outputs the required number of signals based on the system configuration.

The signal output from the common circuit 1 and connected to the CH1 circuit is connected to the transmission signal circuit 21.

The power supply to this transmission signal circuit 21 is controlled by a power control circuit 22 .

The signal input to CI-11 is sent to the second intermediate frequency amplifier 2.
10 and input to the second mixer 211.
The other input signal of the second mixer 211 is the output signal of the second local oscillator 212.

This local oscillator 212 has a constant frequency with respect to the first intermediate frequency of the carrier wave designated in advance as CHI,
For example, frequencies separated by K are oscillated. .

Therefore, the mixed output of the second mixer 211 becomes the second intermediate frequency signal in a constant frequency band regardless of the channel, and is multi-band limited by the bandpass filter 213 and sent to the second intermediate frequency amplifier 214. It is amplified and demodulated by the demodulator 215 to become a voice band signal.

The output signal of demodulator 215 is connected to squelch switch circuit 217 by voice band amplifier 216 .

The second output signal of the intermediate frequency amplifier 214 of the tooth 2 is connected to a carrier wave detector 218, where the presence or absence of the specified wet transmission as C1]1 is detected, and in the case of carrier wave cloth, the squelch switch circuit 217 is connected. The line quality is improved by using IR when there is no carrier wave. (This removes indeterminate noise in the voice band that occurs when the carrier wave is cut off.) The output signal of the squelch switch circuit 217 is amplified by an output amplifier 219, connected to a speaker 220, and delivered to the listener as sound.

In addition, in the explanation in this figure, the audio band signal is taken as an example and the speaker is used as the final output device, but not only the audio signal but also the digital signal is a signal after demodulation, and the corresponding output device If they are connected, they can be constructed in the same way.

Now, the output signal from the carrier wave detector 218 is also connected to the start/stop device 221, and when the squelch switch circuit 217 is connected, it is controlled so that power is continuously supplied to the transmission signal circuit 21.

The output signal of the start/stop device 221 controls the connection/disconnection oscillator 222, and the output signal of the connection/disconnection oscillator 222 controls the power supply connection/disconnection switch 223 to control the power supply to the transmission signal circuit 21.

In other words, in order to reduce the power consumption of CI (1) during standby, the circuit is not constantly supplied with power and the oscillator 2
22, the power supply is repeatedly connected and disconnected at regular intervals. When the carrier wave detector 218 detects that the designated carrier wave has arrived, the start/stop device 221 is controlled to stop the oscillation of the connect/disconnect oscillator 222, and power is continuously supplied to the transmission signal circuit 21. .

The CH2 and CH3 circuits 3.4 are similarly configured to reduce power consumption during standby.

In the conventional method described above, each channel has t
Since the power is connected and disconnected at regular intervals, there is an obvious advantage that the power consumption can be reduced during the interruption, but there are times when one transmission wave arrives during the interruption, and the active Since the start-up time from the element's power supply connection is also a factor, λ'1. Wow, 1℃ force? 11'j will reduce the effectiveness.

Now, the power during standby, the connection time tl, the power outage time L2.11); the time during which the carrier wave exists during power outage L3.210.211.212.213.214.21
8 rising time t4.215.216.217.21
If the time when 9 rises is t5, it means that the field-damaged transmission cannot be received reliably for the time (t3+t4).

Comparing t4 and t5, it is generally said that the force at t5 is one to two orders of magnitude longer than at t4 because the values of circuit elements with time constants are different due to the difference in the signal frequencies handled. Then,
During (ta + ts), the audio band signal can be successfully received and the signal is V, but since the relationship between the carrier wave and the modulated wave is a technology on the transmitting side, it cannot be stated only by the performance of the receiver. If the IfN transmission wave is sent out before the modulated signal is sent out, and if the transmission time of this non-modulated straw transmission wave is t6, then the audio band signal cannot be received for (h+ts-ta) time.

Therefore, (t3 + t4) is still (t3 + ts'
ts), the demodulated signal is reduced and the beginning of the conversation becomes unclear. Note that t5 is generally about several tens of ms, and the naturalness of the call will not be impaired even if t6 is set to a similar time, so although t5 is one to two orders of magnitude longer than t4, It can be designed so that it is not much different from t4/
To simplify the explanation, it is assumed that the demodulated signal is deleted after (t3+t4).

If we summarize the relationship between t1 and t6, it is clear that in conventional circuits, in order to increase the power saving effect, it is necessary to lengthen the power supply cut-off time, but if the cut-off time is long, demodulation becomes difficult. The present invention has been made in view of this problem.The purpose of the present invention is to operate the carrier wave detector when the power is disconnected, In order to eliminate the state in which reception is impossible, which occurs in principle when the power supply is connected during the operation of the With a sleeping carrier detector,
The object of the present invention is to eliminate the t3 time that occurs in principle in conventional circuits by controlling the power of all CHs, and to provide a receiving device that saves power.

In order to achieve the above object, a receiving device having a power saving function during standby according to the present invention receives a plurality of carrier waves, and has a common part having a number of carrier wave output terminals that is 1 greater than the number of the plurality of carrier waves; an all-channel carrier wave detector that detects the presence or absence of all carrier waves by mixing the local oscillator output whose output frequency is swept by a sweep signal oscillator with the carrier wave of the common part and outputs a corresponding control signal; , when a control signal indicating the corresponding carrier wave distribution is sent from the transmission signal circuit installed for each carrier wave output from the common section and demodulating the corresponding carrier wave and the all-channel carrier wave detector, the transmission a power control circuit that continuously supplies power to the transmission signal circuit by closing a switch that supplies power to the signal circuit and maintaining its control state for one repetition period of the sweep signal; It consists of.

According to the above configuration, compared to a conventional receiving device having a power saving function, the demodulated signal is hardly cut off.
A greater power saving effect is obtained and the objective of the invention is fully achieved.

The present invention will be explained in more detail below with reference to one drawing.

FIG. 2 is a system diagram showing an embodiment of the receiving device according to the present invention.

The circuit portions shown in FIG. 2 with the same reference numerals as those in the fi diagram have the same functions, so their explanation will be omitted.

6.7.8 is C) (1, CH2, CH
This is a circuit for 3 channels, and although a 3-channel system configuration is shown as an example, a different number of channels may be used.

Reference numeral 9 denotes an all-CH carrier wave detector which is always asleep according to the present invention, and a detailed system diagram thereof is shown in FIG.

In FIG. 2, CH1 differs from the conventional circuit in the power control circuit 61. This power control circuit 61 does not itself issue a disconnection signal and is not controlled based on information from the carrier wave detector 218, but operates based on a control signal from the all-CH carrier wave detector 9. The all-CH carrier wave detector 9 sweeps the frequencies up to CH2=C) (N (N indicates the maximum channel and in the example shown, N=3) and detects whether or not a carrier wave has arrived at each CH. If a transmission wave has arrived, a control signal is issued to connect the power supply to the corresponding CH circuit.

The control signals from the all-CH carrier wave detector 9 are expressed in a path line (BUS LINE) format in Figure 1, but whether the control signals are sent serially or in parallel, the point is that all Any configuration may be used as long as it is a line that can notify the CH carrier wave detector 9 and the corresponding panel of the arrival of the carrier wave. CHI to CH of all CH carrier wave detectors 9
If the time for one sweep up to N is t7, the control signal to each CH is shorter than t7/N.
11 until the arrival of the control signal after the next sweep, that is, t
The power supply connection/disconnection switch 223 is controlled to supply power for 7 hours.

In Figure 2, 101.601.701.801.9
01 is a power input terminal of the common circuit 1 and CH circuit 6.7.8.9, and 602.702.802 is a control signal input terminal from the all-CH carrier wave detector 9.

In Figure 3, a second intermediate frequency amplifier 210, a second mixer 211, a power input terminal 901, and a control signal output terminal 90
2 is the same as that in FIG. 1 or FIG. 2, and the output frequency of the third local oscillator 92 is controlled by the sweep signal oscillator 91.

The local oscillator 92 oscillates and sweeps a frequency that is separated by j5 from the first intermediate frequency of the ty waiting time CHI to CHN in order to detect a carrier wave corresponding to C)(1 to CHN.

The output signal of the mixer 211 passes through a bandpass filter 93 having a bandwidth narrower than at least the adjacent carrier spacing. Now, if a parasitic wave arrives at CH1, a signal is output to the second intermediate frequency band, and the carrier wave detector 94 opens the gate circuit 95 as a carrier wave cloth.

Therefore, the sweep signal from the sweep signal oscillator 91 is input to the IH number conversion circuit 96 through the gate 95.

In the CH number conversion circuit 96, the frequency from the sweep signal oscillator 91 is converted to the frequency of the carrier wave, and the control circuit 97 converts the frequency from the sweep signal oscillator 91 into the frequency of the carrier wave.
In order to supply power to I, a control signal is sent to the holding circuit 611 of the power control circuit 22 via the terminal 902.602.

As is clear from the above description of the operation, according to the circuit of the present invention, the power during standby is only the sum of the power supplied to the all-CH carrier wave detector 9 and the power supplied to the control section (for example, 61) of each CH.

The time required to reduce the demodulated signal is (h + t4) time.

Since t7 time is the time to sweep the first intermediate frequency band, it can be set much faster than \t4, but it is a function of the frequency to be swept or the number of CHs, and it is also related to detection accuracy, so compared to tt4. Although it may not be an extremely short time, it can be said to be much shorter than t3, which is said to be about 1 second.

The above is summarized in Table 1 as follows.

Table 1 However, Pl is the power consumption P2 of the transmission signal circuit 21, the power consumption P3 of the power control circuit 21 or 61 is more than the power consumption of the all-CH carrier wave detector 9, and as is clear from Table 1, according to the present invention, In other words, the larger the number of channels, the greater the power saving effect, and there is no conflict between the power saving effect and demodulated signal attrition, and the demodulated signal attenuation phenomenon is practically negligible, resulting in huge power savings. It worked.

[Brief explanation of drawings]

Fig. 1 is a system diagram of a conventional power-saving type receiving device, Fig. 2 is a system diagram of a receiving device that saves power during standby according to the present invention, and Fig. 3 is a system diagram of an all-CH carrier which is a component of the present invention. It is a system diagram of a detector. 1... Common circuit 2.3.4... CH11CH2, C in conventional circuit
H3 circuit 5...power supply circuit 6.7.8...CHI, CH2, CH3 according to the present invention
Circuit 9...All CH carrier wave detector 11...High frequency amplifier 12...Mixer 13...
- Local oscillator 14...Intermediate frequency amplifier 15...Branch circuit 21...Transmission signal circuit 22...Power control circuit 61...Power control circuit according to the present invention 101.201.301.401. 601.701.8
01.901...Power input terminal to 1.2.3.4.6.7.8.9 91...Sweep signal oscillator 92...Local oscillator 93...Band pass filter 94. ...Carrier wave detector 95...Gate circuit 96
...CH number conversion circuit 97...Control circuit 210...Second intermediate frequency amplifier 211...Second mixer 212...Local oscillator 2
13...Band filter 214...Second intermediate frequency amplifier 215...Ejl adjuster 216...Voice band amplifier 217...Squeltis/f-tch 48...Carrier wave detector 219...・Output multiplier 2
20...Speaker 221...Start/stop device 22
2...Connection/disconnection oscillator 223...Power supply connection/disconnection switch 611...Control signal output of control signal input terminals 902...9 to holding circuits 602, 702, 802...6.7.8 Terminal diagram 1? Figure 2 Figure 3

Claims (1)

[Claims] a common part that receives a plurality of carrier waves and has carrier wave output terminals whose number is one greater than the number of the plurality of carrier waves; a local oscillator output whose output frequency is swept by a sweep signal oscillator; An all-channel carrier wave detector that detects the presence or absence of all carrier waves and outputs a corresponding control signal by mixing the carrier waves with the carrier wave, and an all-channel carrier wave detector that is installed for each carrier wave output from the common section and outputs a corresponding control signal. When a control signal indicating the presence of a corresponding carrier wave is sent from the transmission signal circuit to be demodulated and the all-channel carrier detector, a switch that supplies power to the transmission signal circuit is closed, and the control state is changed to the above-mentioned state. By holding the sweep signal for one repetition period,
Receiving device 0 having a circuit for saving power during standby, characterized in that it is constituted by a channel circuit group having a power control circuit that continuously supplies power to the transmission signal circuit.