JPS63164068A - Transmitter-receiver - Google Patents

Abstract

PURPOSE:To prevent useless consumption of power when there is no signal, to receive a valid signal without any lack of a part, and to prevent an erroneous action caused by beams other than a light signal beam by providing a circuit to turn on a power supply and a circuit to turn off the power supply to a second transmitter-receiver. CONSTITUTION:To the second transmitter-receiver 102 that receives a radio signal transmitted from a second transmitter-receiver 101, the power supply turning-in circuit 107 and the power supply turning-off circuit 108 are provided. In order to start the transmitter-receiver 101 to transmit a radio signal from the transmitter-receiver 102, an operator manipulates the manual input part 110 of the latter to turn on the power supply by the power supply turning-in circuit 107. Accordingly, the transmitter-receiver 102 can be ready well in time for the starting transmission in the transmitter-receiver 101, and can receive radio signals accurately from the beginning. If the part 110 is not manipulated, the power supply is not turned on, hence an erroneous action can be prevented. In case the part 110 or the transmission of radio signals from the transmitter-receiver 101 stops, since the additional information of a radio signal is no longer detected, the power supply turning/off circuit 108 cuts off power supply, and the useless power consumption when the signal is absent can be prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a wireless signal transmitting/receiving device using light or radio waves, and in particular to a power control method suitable for a wireless receiving device having a remote control function. be.

[Conventional technology]

As a conventional power control system for a wireless receiving device, there is one described in Japanese Patent Application Laid-Open No. 59-200541. Figure 7 11 is a diagram showing the conventional power supply control system,
In the figure, 8 is a reception power supply circuit for the reception signal circuit 9, 11 is a transistor that supplies a start signal to the reception power supply circuit 8, 12 is a transistor provided in the base circuit of the transistor 11, and 13 is provided in the base circuit of the transistor 12. Among the transistors provided, 14 is a charging/discharging capacitor connected to the base circuit of transistor 12, and 15 is a phototransistor connected to the emitters of transistors 11 and 13.

Figure 8 shows a signal waveform diagram of each part of the circuit in Figure 7.
(1) is the optical signal waveform incident on the phototransistor 15, (millet) is the collector voltage waveform of the phototransistor 15, (C) is the voltage waveform of the capacitor 14, (d) is the collector voltage waveform of the transistor 12, (e) represents the collector voltage of transistor 11.

Next, the operation of the circuit shown in FIG. 7 will be explained based on the signal waveform diagram shown in FIG. 8. When an optical signal (σ in FIG. 8) enters the phototransistor 15, this phototransistor 1
The collector voltage of transistor 5 (Figure 8) fluctuates, and in response to this fluctuation, transistor 13 turns on.

When this transistor 13 is turned on, the capacitor 14
By setting the time constant for charging to be smaller than the time constant for discharging, the capacitors 14 are sequentially charged (
Figure 8C). When this charging voltage exceeds the reference level VON, the transistor 12 is turned on (FIG. 8d).
An activation signal is supplied from the transistor 11 to the reception power supply circuit 8 (Fig. 8e), and the ? The u source is supplied to the receiving signal circuit 9.

Contrary to the above, when the optical signal is no longer input.

When the charging voltage of the capacitor 14 becomes lower than the reference level VON, the 1-transistor 12 is turned off, the activation signal from the transistor 11 disappears, and power is no longer supplied to the receiving signal circuit 9.

In other words, the conventional power control system described above is designed to supply power to the reception signal circuit 9 only at 9 o'clock (9 o'clock) to prevent unnecessary power consumption.

[Problem that the invention seeks to solve]

Since the conventional power transmission device, especially the power supply control system, is configured as described above, even if an optical signal is received, the time from t to time t2 until the charging voltage of the capacitor 14 becomes equal to or higher than the reference level is shortened. During that period, no consideration was given to the fact that the receiving signal circuit 9 did not operate.

In order to receive the optical signal normally from the point of incidence,
A dummy control signal must be added before that, which complicates the circuit on the transmitting side.However, if the charging voltage of the capacitor 14 exceeds the reference level due to light from a light source other than the optical signal, the power supply will be turned off. There was a problem in that the signal was supplied to the receiving signal circuit 9.

The present invention has been made in order to eliminate the above-mentioned problems, and its purpose is to prevent wasteful power consumption when there is no signal, and to be able to receive effective signals without missing any part of them, while also being able to receive signals other than signal light. An object of the present invention is to provide a transmitting/receiving device that does not malfunction due to light.

[Means for solving problems]

In order to achieve the above object, the present invention provides a second transmitting/receiving device that receives a wireless signal transmitted from a first transmitting/receiving device, based on an operation result of an operation input unit that operates a remote control, a received signal. The second transmitting/receiving device includes a power-on circuit that predicts the presence or absence and turns on the power of the second transmitting/receiving device, and a power-off circuit that determines whether additional information of the wireless signal is detected and shuts off the power. It is distinctive in that it did so.

[Effect]

The transmitter/receiver according to the present invention includes a power supply circuit and a power supply cutoff circuit in the second transmitter/receiver that receives the wireless signal transmitted from the first transmitter/receiver. When the operation input section is operated in order to start transmitting a wireless signal from the transmitter/receiver, a power supply circuit turns on the power based on the operation result.

As a result, there is sufficient time for the first transmitter/receiver to start transmitting, and the radio signal transmitted from the first transmitter/receiver can be accurately received from the beginning. Furthermore, if the operation input section is not operated, the power is not turned on, so malfunctions can be prevented.

If the transmission of a wireless signal is stopped due to operation of the operation input unit or the first transmitting/receiving device itself, the additional information of the wireless signal cannot be detected, so the power cutoff circuit cuts off the power and eliminates waste when there is no signal. Prevent power consumption.

〔Example〕

The invention will now be described in detail with reference to one drawing.

FIG. 1 is a block diagram of one embodiment of the present invention.

In FIG. 1, 101 is a first transmitting/receiving device, and 102 is a second transmitting/receiving device. The first transmitting/receiving device 101 includes an audio signal transmitting circuit 103 and a control signal receiving circuit 10.
It consists of 4. The second transmitting/receiving device 102 includes an audio signal reproducing circuit 105 and a power supply 10 for the audio signal reproducing circuit.
6. Power-on circuit 107. It consists of a power cutoff circuit 108, a remote control circuit 109, and an ff1 operation input section 110.

When the operation input unit 110 is operated to input an input to activate the audio signal transmission circuit 103, the remote operation circuit 109 sends a control signal to the control signal reception circuit 104, and
At the same time as the audio signal transmitting circuit 103 is brought into operation, the power supply circuit 107 is operated to turn on the power supply 106 and the audio signal reproduction circuit 105 is brought into operation.

The audio signal transmission circuit 103 converts the audio signal into a wireless signal, adds additional information to the wireless signal, and transmits the wireless signal. The audio signal reproducing circuit 105 receives the additional information along with the wireless signal, and reproduces the audio signal from the wireless signal.

When the audio signal transmission circuit 103 completes a predetermined operation and stops, the transmission of additional information is also stopped at the same time. Therefore, the audio signal reproducing circuit 105 determines whether to stop transmitting the additional information, operates the power cutoff circuit 108, cuts off the power supply 106, and stops the operation of the audio signal reproducing circuit 105.

According to the above first embodiment, the audio signal transmitting circuit 10
3 is in a stopped state, the audio signal reproducing circuit 105 is powered off, which has the effect of reducing the power consumption of the second transmitting/receiving device 102.

FIG. 2 is a block diagram showing the configuration of the second transmitting/receiving device 102 when a compact disc player is used as the audio signal transmitting circuit 103 of the first transmitting/receiving device 101. As shown in FIG.

In FIG. 2, the audio signal reproducing circuit 105 includes an optical/electrical converter 1o that converts input light into an electrical signal and a receiving section 19 that inputs the electrical signal from the optical/electrical converter.
It consists of

The receiving section 19 includes a receiving signal circuit 9 that demodulates the received signal, a signal processing circuit 6 that processes the demodulated digital signal and includes a synchronization detection circuit 7 as additional information detection means, and a signal processing circuit. The audio circuit 5 converts the digital audio signal outputted from the audio circuit 6 into an analog audio signal and outputs the analog audio signal.

1 is an electric/optical converter that converts an electric signal into light and outputs it;
2 is a transmission signal circuit that supplies transmission information as an electrical signal to the electric/optical converter 1; 4 is a key operation section that controls transmission information; 8 is a reception power supply circuit that supplies power to the reception section 19; 3;
is the transmission signal circuit 2゜key operation section 4. This is a microcomputer (hereinafter referred to as a microcomputer) that controls the signal processing circuit 6, the synchronization detection circuit 7, and the receiving power supply circuit 8. It predicts the presence or absence of a received signal from the operation results of the key operation section 4, and Detection output from synchronization detection circuit 7 (additional information)
The power supply circuit 10 shown in FIG.
7. It realizes the functions of the power cutoff circuit 108 and the remote control circuit 109.

The light (i number (j)) transmitted from the electrical/optical converter 1 is a control signal that controls the operation of the CD player.The optical signal (k) received by the optical/electrical converter 10 is , is a digital (+m) optically modulated signal reproduced from a CD player.

Next, the operation shown in FIG. 2 will be explained.

First, a case in which power is supplied to the receiving section 19 will be described using FIGS. 3 and 4. FIG. 3 is a flowchart showing the operation of the microcomputer 3, and FIG. 4 shows signal waveforms at various parts of the circuit shown in FIG.

In FIG. 4, (() is a signal for detecting a key operation and interpreting the type of selected key, and (g) is for turning on power supply to the receiving unit 19 by a control signal.

A control signal for the reception power supply circuit 8 that turns off the power supply circuit 8, (h) a signal that indicates ON and OFF of the power supply to the reception unit 19, (
L) is the output signal of the code based on the key operation from the microcomputer 3 to the transmission signal circuit 2, (j) is the control signal for remotely controlling the CD player, and (k) is the signal that starts playback by the signal (j). This is an optical modulation signal of an EFM signal output from a CD player.

After the start (step 3-1), it is repeatedly determined whether or not a reproduction key signal is input from the key operation section 4. (Step 3-2).

When the reproduction key is selected on the key operation unit 4, the signal (child) is input to the microcomputer 3, and in step 3-2 it is determined that it is "present", and in step 3-3 it is determined that it is ttYES.

This predicts that the transmission from the CD player will start, and the microcomputer 3 outputs the signal (j) to the reception power supply circuit 8 in step 3-4, and the reception power supply circuit 8 outputs the signal (j) to the reception power supply circuit 8. As shown in h), power supply to the receiving section 19 is started. As a result, the receiving unit 19 enters a reception standby state.

Next, in step 3-5, the microcomputer 3 generates a remote control code corresponding to the reproduction key, and outputs a signal (i) to the transmission signal circuit 2. The transmission signal circuit 2 outputs the optical signal 5.(j) to the CD player via the electrical/optical converter 1. The CD player receives an optical signal (j),
Start reproduction and output optical signal (k).

At the time when this optical signal (k) is received by the optical/electrical converter 10, the receiving section 19 is already in the timing state, and after the received signal is demodulated by the receiving signal circuit 9, the signal processing circuit 6,
Via the audio circuit 5.

Audio signals can be output normally.

Next, the case where the transmission from the CD player stops due to the end of the playback of the song or the selection of stop or pause by operating the key operation section 4 will be explained using FIGS. 5 and 6. do.

FIG. 5 is a flowchart showing the operation of the microcomputer 3, and FIG. 6 shows signal waveforms at various parts of the circuit shown in FIG.

In Fig. 6, (Q) is the synchronization detection signal, ■ is the timer count interval inside the microcomputer 3, ('l-), (h)
is the signal shown in FIG. 4 above.

After the start (step 5-1), the variable is cleared and 0 is assigned in step 5-2. Next step 5-3
A certain time interval is taken at step 5-4, and it is determined whether the circle = φ. If the synchronization signal (Q) is input during the period of step 5-3, the interrupt routine is executed and 1 is set in (step 5-6),')-L.
Steps 5-7 5-8).

Therefore, if input=φ in step 5-4.

This means that the synchronization signal (Q) has not been detected even once within a certain period of time, and it can be determined that the transmission from the CD player has stopped.

As a result, in step 5-5, a control signal (9
) is output. Therefore, the power supply to the receiving section 19 is stopped as shown in the signal waveform (h), and wasteful power consumption can be prevented.

In the above embodiment, a CD player is controlled, but the same effect as in the above embodiment can be obtained with any device that transmits digital data through key operations.

Further, in the above embodiment, a transmission method using optical signals has been described, but it is clear that transmission using radio waves is also possible.

Furthermore, although a synchronization signal was used as a method for determining transmission stop, if the transmission data is additional information including bit synchronization clock of the transmission digital data, playback time code, etc., a change in time code, etc. over a certain period of time can be used as a judgment condition. However, this does not constitute an explanation of the present invention.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the second transmitting/receiving device that receives the no-# signal transmitted from the first transmitting/receiving device is equipped with a power-on circuit and a power-off circuit, and Since the power supply circuit is configured to turn on the power based on the operation of outputting a control signal from the transmitting/receiving device to operate the first transmitting/receiving device, the radio signal transmitted from the first transmitting/receiving device is activated from the beginning. can be received accurately. In addition, if the second transmitting/receiving device does not output a control signal, even if other light or radio waves are input during the period when no wireless signal is being transmitted from the first transmitting/receiving device, the second transmitting/receiving device will be reliably activated. Since the power source can be shut off, unnecessary power consumption can be prevented and the power reduction effect can be achieved without impairing the receiving function.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a transmission/reception sm according to an embodiment of the present invention, FIG. 2 is a book diagram showing the configuration of a second transmitting/receiving device when a compact disk is used as the first transmitting/receiving device, and FIG. 4 is a flowchart showing the operation of the microcomputer when power is supplied to the receiving section, FIG. 4 is a signal waveform diagram of each part in that case, and FIG. 5 is a flowchart showing the operation of the microcomputer when cutting off the power to the receiving section. 6 is a signal waveform diagram of each part in that case, FIG. 7 is a block diagram showing a conventional power supply control system, and FIG. 8 is a signal waveform diagram of each part. 101...First transmitting/receiving device, 102...Second transmitting/receiving device, 103...Audio signal transmitting circuit. 104... Control signal receiving circuit, 105... Audio signal reproducing circuit, 106... Power source, 107... Power on circuit, 108... Power cutoff circuit, 109... Remote control circuit, 110...・Operation input section. Figure l Diagram 2 Name of Figure 3 Figure 4 (Figure 5 fAIT; Figure 6 (h) Figure 7 Figure 8

Claims (3)

[Claims] (1) A first transmitting/receiving device having an audio signal transmitting circuit that transmits a reproduced audio signal by a wireless signal and a control signal receiving circuit that receives a control signal to remotely control the audio signal transmitting circuit; A transmitting/receiving device comprising an audio signal reproducing circuit that receives and reproduces the audio signal, a remote control circuit that transmits the control signal, and a second transmitting/receiving device that has an operation input unit that operates the remote control circuit, a power-on circuit for turning on power to the audio signal reproducing circuit by operation of the operation input unit; and a power-cutting circuit for cutting off power to the audio signal reproducing circuit depending on whether additional information of the wireless signal is detected; A transmitting/receiving device comprising: a transmitting/receiving device. (2) The wireless signal is digitized audio data, and the audio signal reproduction circuit includes a signal processing circuit for processing the digitized audio data. Transmitting/receiving device described in Section 1. (3) The transmitting/receiving device according to claim (2), wherein the signal processing circuit is provided with means for detecting additional information of a wireless signal.