JP2003133976A - Receiving device, transmitting device, and communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a receiving device which can appropriately control a predetermined control object based on control signals on the receiving side, even if reception failures occur when signals mixed with a digital control signal and an analog voice signal are transmitted. SOLUTION: When a demodulated tone signal is not detected at a tone detection circuit 57, a control circuit 58 generates a control signal SC controlling a predetermined control subject based on the digital control signal included in the demodulated tone signal with the predetermined time interval, and generates a control signal SC stopping the operation of the control object when the digital control signal cannot be detected within the predetermined time interval. The control circuit 58 outputs the analog voice signal SA included in the demodulated signal from a switch circuit 56 to an external device, while the tone signal is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when transmitting and receiving a signal in which a digital control signal and a tone signal are mixed,
The present invention relates to a receiving device, a transmitting device, and a communication system that can appropriately perform control based on a control signal even when there is a reception failure on the receiving side.

[0002]

2. Description of the Related Art For example, in a station premises, a wireless microphone transmits a signal in which a digital control signal and an analog audio signal are mixed, as shown in FIG. A system in which the receiving device receives the signal is used. The control signal is, for example, for turning on / off the bell, and the voice signal is a signal of a voice emitted by the station staff. Based on the control signal included in the signal from the wireless microphone, the receiving device switches the bell from off to on at the timing when the control signal is on, as shown in FIG. The bell is switched from on to off at the timing indicating off.

[0003]

By the way, the signal received from the wireless microphone by the receiving device may be subject to continuous reception failure, for example, as shown in FIG. 5 (C). In such a case, the receiving device cannot detect the control signal existing during the reception failure, which causes a malfunction. For example, when a reception failure occurs at the timing shown in FIG. 5C, the control signal indicating OFF cannot be detected by the receiving device, and the bell continues to be in the ON state as shown in FIG. 5D. Will end up.

The present invention has been made in view of the above-mentioned problems of the prior art, and when a signal in which a digital control signal and an analog voice signal are mixed is transmitted and received, even if a reception failure occurs, the reception side is present. An object of the present invention is to provide a receiving device and a communication system that can appropriately control a predetermined control target based on a control signal.

[0005]

In order to solve the above-mentioned problems of the prior art and to achieve the above-mentioned object, the receiving device of the first invention comprises a tone signal and an analog signal inserted together with the tone signal. A receiver for receiving a signal in which an audio signal and a digital control signal inserted at a predetermined time interval within a period in which the analog audio signal is not inserted are received, and the received signal is demodulated. Demodulation means, tone detection means for detecting the tone signal inserted in the demodulated signal, and the demodulated signal included at the predetermined time interval within a period in which the tone signal is not detected. The control of a predetermined control target is performed based on the digital control signal, and the control of stopping the operation of the control target when the control signal cannot be detected within the predetermined time interval. There, during the period in which the tone signal is detected, and a control means for controlling to output audio signal of the analog contained in the demodulated signal to the outside of the receiving apparatus.

The operation of the receiving device of the first invention is as follows. In the receiving device, a tone signal, an analog voice signal inserted together with the tone signal, and a digital control signal inserted at a predetermined time interval within a period in which the analog voice signal is not inserted are mixed. A signal is received, and the signal is first demodulated by demodulation means.
Then, the tone detecting means detects the analog tone signal inserted in the demodulated signal.
Then, the control means controls a predetermined control target based on the digital control signal included in the demodulated signal at the predetermined time interval, within a period in which the tone signal is not detected. At this time, the control means performs control to stop the operation of the controlled object when the control signal cannot be detected within a predetermined time interval. Further, the control means performs control to output the analog audio signal included in the demodulated signal to the outside of the receiving device during the period in which the tone signal is detected.

The receiving apparatus of the first invention preferably comprises a plurality of antennas for receiving a signal in which the control signal and the audio signal are mixed, and a diversity processing for the signals received by the plurality of antennas to perform the demodulation. And diversity processing means for outputting to the means.

In the transmitting apparatus of the second invention, the antenna, the voice input means for generating an analog voice signal according to the inputted voice, the operating means, and the control mode are designated by the operating means. In this case, according to the instruction input from the operating means, a digital control signal is inserted into the transmission signal transmitted from the antenna at predetermined time intervals,
And a control means for inserting the analog voice signal generated by the voice input means into the transmission signal together with a tone signal when the voice output mode is designated by the operating means.

A communication system according to a third aspect of the present invention is a communication system having a transmitter and a receiver, wherein the transmitter has an antenna and a voice for generating an analog voice signal according to an input voice. Input means, operation means,
When a control mode is designated by the operating means, a digital control signal is inserted at a predetermined time interval into a transmission signal transmitted from the antenna according to an instruction input from the operating means, and the operating means is operated. A first control unit for inserting the analog voice signal generated by the voice input unit into the transmission signal together with a tone signal when a voice output mode is designated. An antenna for receiving a signal transmitted from the device, a demodulating means for demodulating the received signal, a tone detecting means for detecting the tone signal inserted in the demodulated signal, and the tone signal are detected. Within a certain period, performs control of a predetermined control target based on the digital control signal included in the demodulated signal at the predetermined time interval, When the control signal cannot be detected within the predetermined time interval, control is performed to stop the operation of the controlled object, and the analog signal included in the demodulated signal is included within the period in which the tone signal is detected. Second control means for controlling the output of the audio signal to the outside of the receiving device.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall configuration diagram of a communication system 1 of this embodiment. As shown in FIG. 1, the communication system 1 includes, for example, a wireless microphone 2,
The antennas 3_1 to 3_n, the antennas 4_1 to 4_n, the reception device 5, the control target device 6, the control target device 7, and the reception unit 8 are included. Here, the wireless microphone 2 corresponds to the transmitting device of the present invention, and the receiving device 5 corresponds to the receiving device of the present invention. The communication system 1 is, for example,
It is installed in the station yard.

Each constituent element shown in FIG. 1 will be described below. [Wireless Microphone 2] The wireless microphone 2 is used, for example, by a station staff (user) in a station yard. FIG. 2 is a functional block diagram of the wireless microphone 2 shown in FIG. As shown in FIG. 2, the wireless microphone 2 has an antenna 31, a microphone 32, an operation unit 33, and a control unit 34. Here, the antenna 31 corresponds to the antenna of the transmitting device of the present invention, the microphone 32 corresponds to the voice input means of the transmitting device of the present invention, the operation unit 33 corresponds to the operating means of the transmitting device of the present invention, and control is performed. The unit 34 corresponds to the control means of the transmission device of the present invention. As shown in FIG. 3A, the wireless microphone 2 uses the tone signal TO
A signal in which NE, an analog audio signal SA inserted together with the tone signal TONE, and a digital control signal SC1 inserted at a predetermined time interval during a period in which the analog audio signal SA is not inserted are mixed. Send.

The microphone 32 is the wireless microphone 2
Voice signal SA corresponding to the voice uttered by the user
To generate. The operation unit 33 is, for example, an operation button, and outputs an operation signal according to an operation by the user to the control unit 34. When the audio output mode is designated by the operation signal from the operation unit 33, the control unit 34 inserts the analog audio signal SA input from the microphone 32 into the transmission signal together with the tone signal TONE and transmits from the antenna 31. . Further, when the control mode is specified by the operation signal from the operation unit 33, the control unit 34 performs digital control corresponding to the instruction specified by the operation signal input from the operation unit 33 according to the operation by the user. Signal S
Antenna C3 is inserted by inserting C1 into the transmission signal at a predetermined time interval.
Send from 1.

[Antennas 3_1 to 3_n, Antenna 4_
1-4_n] The antennas 3_1 to 3_n are, for example, arranged in a predetermined area in the station yard at predetermined intervals. The antennas 3_1 to 3_n respectively receive the signals shown in FIG. 3A transmitted by the wireless microphone 2 and output the signals to the antenna mixing / distributing device 20 of the receiving device 5.

The antennas 4_1 to 4_n are arranged at predetermined intervals in an area different from the above-mentioned predetermined area in the station yard. The antennas 4_1 to 4_n respectively receive the signals shown in FIG. 3A transmitted by the wireless microphone 2, and the antenna mixing distributor 20 of the receiving device 5 receives the signals.
Output to.

[Reception Device 5] As shown in FIG. 1, the reception device 5 includes, for example, an antenna mixing / distributing device 20 and a distributing device 2.
1, a distributor 22, a receiving unit 23, and a receiving unit 24. The antenna mixing / distributing device 20 includes the antenna 3
The received signals received by each of _1 to 3_n are input, these are mixed and processed to generate a received signal S3, and the received signal S3 is output to the distributor 21. Specifically, the antenna mixing / distributing device 20 includes the antennas 3_1 to 3_.
Each of the received signals input from n is multiplied by a predetermined coefficient, and the multiplication results are added to generate the received signal S3.

The antenna mixing / distributing device 20 receives the received signals received from each of the antennas 4_1 to 4_n, mixes these signals to generate a receiving signal S4, and distributes the receiving signal S4 to the distributing device 22. Output to. Specifically, the antenna mixing / distributing device 20 includes the antennas 4_1 to 4-4.
Each of the reception signals input from _n is multiplied by a predetermined coefficient, and the multiplication results are added to generate the reception signal S4.

The distributor 21 distributes the reception signal S3 input from the antenna mixing / distributing device 20 and outputs it to the first ports of the receiving unit 23 and the receiving unit 24.

The distributor 22 distributes the reception signal S4 input from the antenna mixing / distributing device 20 and outputs the signals to the second ports of the receiving unit 23 and the receiving unit 24.

The receiving unit 23 receives the received signal S3 from the distributor 21 and the received signal S from the distributor 22.
4 is selected, RF amplification processing, frequency conversion processing, IF amplification processing and demodulation processing are performed on the selected reception signal, and the analog audio signal SA included in the reception signal is transmitted to the control target device 6. At the same time as outputting, the control signal SC is generated based on the digital control signal SC1 included in the received signal, and is output to the controlled device 6.

FIG. 4 is a block diagram of the receiving unit 23. As shown in FIG. 4, the receiving unit 23 is, for example,
Selection circuit 51, RF amplification circuit 52, frequency conversion circuit 5
3, IF amplification circuit 54, demodulation circuit 55, switch circuit 5
6, a tone detection circuit 57, a control circuit 58, an RF amplification circuit 62, a frequency conversion circuit 63, an IF amplification circuit 64, a demodulation circuit 65, an audio filter 76, a tone filter 77 and a control filter 78. Here, the demodulation circuit 55 corresponds to the demodulation means of the present invention, the tone detection circuit 57 corresponds to the tone detection means of the present invention, and the control circuit 58 corresponds to the control means of the present invention.

The RF amplification circuit 52 RF-amplifies the reception signal S3 input to the first port to generate a reception signal S52 and outputs it to the frequency conversion circuit 53 in the subsequent stage.

The frequency conversion circuit 53 is an RF amplification circuit 52.
The received signal S52 input from is converted into an intermediate frequency (IF) to generate a received signal S53,
Output to the amplifier circuit 54. The IF amplification circuit 54 amplifies the reception signal S53 input from the frequency conversion circuit 53 so as to have a good SN ratio, generates a reception signal S54, and outputs this to the demodulation circuit 55 in the subsequent stage.

The demodulation circuit 55 demodulates the reception signal S54 input from the IF amplification circuit 54 to generate a reception signal S55 and outputs it to the selection circuit 51 in the subsequent stage.

RF amplification circuit 62, frequency conversion circuit 63,
The IF amplification circuit 64 and the demodulation circuit 65 perform the same processing as the RF amplification circuit 52, the frequency conversion circuit 53, the IF amplification circuit 54, and the demodulation circuit 55, respectively, on the reception signal S4 input to the second port. , And outputs the received signal S65 as a result to the selection circuit 51.

The selection circuit 51 selects one of the reception signal S55 from the demodulation circuit 55 and the reception signal S65 from the demodulation circuit 65 based on the control signal from the control circuit 58, and outputs a voice signal as the reception signal S51. It outputs to the filter 76, the tone filter 77, and the control filter 78.

The audio filter 76 extracts the audio signal SA from the received signal S51 and outputs it to the switch circuit 56.
The tone filter 77 extracts the tone signal TONE from the received signal S51 and outputs it to the tone detection circuit 57. The control filter 78 extracts the control signal SC from the received signal S51 and outputs it to the control circuit 58.

The switch circuit 56 enters a connected state or a disconnected state based on the control signal S58 from the control circuit 58. The tone detection circuit 57 outputs a tone detection notification signal S57 indicating whether or not the tone signal TONE is detected from the tone filter 77 to the control circuit 58.

The control circuit 58 outputs a control signal S58 for connecting the switch circuit 56 to the switch circuit 56 while the tone detection notification signal S57 from the tone detection circuit 57 indicates that the tone signal is being detected. , The control signal S for disconnecting the switch circuit 56 while the tone detection notification signal S57 indicates that the tone signal is not detected.
58 is output to the switch circuit 56. The control circuit 58 is
The received signal S input from the demodulation circuit 55 while the tone detection notification signal S57 indicates that no audio signal is detected.
The control signal SC for controlling the controlled device 6 shown in FIG. 1 is generated based on the control signal SC1 included in 55, and is output to the controlled device 6. In the present embodiment, the control circuit 58 detects the control signal SC when the tone detection notification signal S57 indicates that the voice signal is not detected and the control signal SC cannot be detected at the predetermined interval. The control signal SC indicating that the control target device 7 is turned off is output to the control target device 6 at the scheduled timing.

The receiving unit 24 has basically the same calibration as the receiving unit 23 shown in FIG. 4 and controls the controlled device 7.

[Control Target Device 6, 7] Control Target Device 6,
Reference numeral 7 denotes a bell or a display device equipped with a speaker in the station yard, which is controlled based on the control signals SC from the receiving units 23 and 24, respectively, and outputs a sound according to the analog sound signal SA.

The receiving unit 8 is an expanded receiving unit and has, for example, the configuration shown in FIG.

An operation example of the communication system 1 shown in FIG. 1 will be described below. [First Operation Example] In this operation example, an operation example in the case where the reception signal received by the receiving device 5 has no reception failure will be described.
First, for example, a user of the wireless microphone 2
In the period of timings t2 to t3 shown in FIG. 3A, the voice output mode is specified by the operation unit 33 to perform voice input to the microphone 32, and the control mode is specified in the other periods and a predetermined period is input from the operation unit 33. Enter the instructions. As a result, under the control of the control unit 34 shown in FIG. 2, the tone signal T is generated in the period of timings t2 to t3 as shown in FIG.
The control signal SC1 in which the ONE is inserted and the bell is turned on / off at a predetermined time interval during the other period.
The signal in which is inserted is transmitted from the antenna 31.

The transmitted FIG. 3A is received by the antennas 3_1 to 3_n shown in FIG. 1, for example, without any reception obstacle, undergoes a mixing process by the antenna mixing / distributing device 20 of the receiving device 5, and receives It is output to the distributor 21 as S3. Then, the distributor 21 outputs the reception signal S3 to the reception unit 23 and the reception unit 24.

Then, the received signal S3 is subjected to RF amplification processing, frequency conversion processing, I conversion processing in the reception unit 23 shown in FIG.
The reception signal S55 is generated through the F amplification processing and the demodulation processing, and the reception signal S55 is selected by the selection circuit 51 and output to the audio filter 76, the tone filter 77, and the control filter 78. Then, in the audio filter 76, the tone filter 77 and the control filter 78, the received signal S55 to the audio signal SA and the tone signal T are respectively received.
The ONE and the control signal SC are extracted, the audio signal SA is output to the switch circuit 56, the tone signal TONE is output to the tone detection circuit 57, and the control signal SC is output to the control circuit 58.

Then, the tone detection circuit 57 detects the presence or absence of the tone signal TONE, and outputs the tone detection notification signal S57 indicating the result to the control circuit 58.
Based on the tone detection notification signal S57, the control circuit 58 outputs the control signal SC for turning on the bell of the controlled device 6 at the timing t1 shown in FIG. 3 based on the control signal SC1 for indicating on. Output to. As a result, as shown in FIG. 3B, the bell of the controlled device 6 is turned on at the timing t1.

Thereafter, at the timing t2, it is shown that the tone detection signal S57 detects the tone signal TONE,
Based on this, the control signal S indicating that the control circuit 58 is connected
58 is output to the switch circuit 56. As a result, the switch circuit 56 is brought into the connected state, and the analog audio signal S
A is output to the controlled device 6, and the controlled device 6 outputs a sound corresponding to the audio signal SA. After that, at the timing t3, the tone detection signal S57 changes to the tone signal TO.
It indicates that NE is not detected, and based on that, the control circuit 58 outputs the control signal S58 indicating non-connection to the switch circuit 56. As a result, the switch circuit 56 is brought into a non-connection state.

The control circuit 58 controls the timing t shown in FIG.
In step 4, the control signal SC for turning off the bell of the controlled device 6 is output to the controlled device 6 based on the control signal SC1 indicating off. As a result, as shown in FIG.
At timing t4, the bell of the control target device 6 is turned off.
Subsequently, the control circuit 58 causes the timing t5 shown in FIG.
Then, based on the control signal SC1 indicating ON, the control signal SC for turning on the bell of the controlled device 6 is set to the controlled device 6
Output to. As a result, as shown in FIG. 3B, the bell of the controlled device 6 is turned on at the timing t5. Subsequently, the control circuit 58 causes the timing t6 shown in FIG.
Based on the control signal SC1 indicating off, the controlled device 6
The control signal SC for turning off the bell is output to the controlled device 6. As a result, as shown in FIG. 3B, the bell of the controlled device 6 is turned off at the timing t6.

[Second Operation Example] In this operation example, an operation example in the case where a reception failure occurs in the reception signal received by the reception device 5 will be described. In this case, as in the first operation example,
The signal shown in FIG. 3A is transmitted from the wireless microphone 2, but the signals received and processed by the receiving device 5 are, as shown in FIG. 3C, timings t11 to t.
Between 12 and 12, the noise of the reception disturbance is generated. as a result,
The control circuit 58 cannot detect the control signal SC1 present at timings t3 to t4 and indicating OFF. In this embodiment,
Since the control circuit 58 cannot detect the control signal SC1 indicating ON at the timings t3 to t4, the control circuit 58 outputs the control signal SC indicating OFF to the control target device 6 at the timing corresponding thereto. As a result, as shown in FIG. 3B, the bell of the controlled device 6 is turned off at the timing t4.

As described above, in the communication system 1, when the receiving device 5 cannot detect the control signal SC1 at a predetermined interval, the control target device 6 outputs the control signal SC indicating OFF at the timing scheduled to be detected. , 7 is output. Thereby, even if the control signal SC1 included in the received signal, which indicates that the operations of the controlled devices 6 and 7 are turned off, cannot be detected, the operations of the controlled devices 6 and 7 can be stopped.
As a result, it is possible to avoid a malfunction such as a bell ringing in a station. Therefore, it is possible to suppress the occurrence of train operation failures.

The present invention is not limited to the above embodiments. For example, in the above-described embodiment, the case where the communication system of the present invention is used inside a station is illustrated, but the place of use is not particularly limited. Further, in the above-described embodiment, the bell, the display device, and the like are illustrated as the control target devices 6 and 7 (control target of the present invention), but this is not particularly limited.

[0041]

As described above, according to the present invention,
When a signal in which a digital control signal, a tone signal, and an analog voice signal are mixed is transmitted and received, even if a reception failure occurs, the receiving side can appropriately control a predetermined control target based on the control signal. It is possible to provide a receiving device and a communication system capable of performing the same.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a communication system according to an embodiment of the present invention.

FIG. 2 is a functional block diagram of the wireless microphone shown in FIG.

FIG. 3 is a timing chart of signals used in the communication system shown in FIG.

FIG. 4 is a configuration diagram of the receiving unit shown in FIG. 1.

FIG. 5 is a diagram for explaining a problem of the conventional technique.

[Explanation of symbols]

1 ... communication system, 2 ... wireless microphone, 3_
1 to 3_n, 4_1 to 4_n ... Antenna, 5 ... Receiving device, 6, 7 ... Control target device, 8 ... Receiving unit, 20 ...
Antenna mixing / distributing device 21, 22, ... Distributor, 23, 24
... Reception unit, 31 ... Antenna, 32 ... Microphone, 33
... operation unit, 34 ... control unit, 51 ... selection circuit, 52 ... RF
Amplification circuit, 53 ... Frequency conversion circuit, 54 ... IF amplification circuit, 55 ... Demodulation circuit, 56 ... Switch circuit, 57 ... Tone detection circuit, 58 ... Control circuit

Continued front page    F-term (reference) 5K060 BB05 CC05 CC12 CC19 DD07                       FF01 GG04 HH39 KK03 LL04                       LL26                 5K061 AA04 BB14 CC45 EF09 FF01                       FF11 HH04

Claims (4)

[Claims] 1. A signal in which a tone signal, a voice signal inserted together with the tone signal, and a digital control signal inserted at a predetermined time interval within a period in which the tone signal is not inserted are received. Which is a receiving device, demodulation means for demodulating the received signal, tone detection means for detecting the tone signal inserted in the demodulated signal, and within a period in which the tone signal is not detected, Performing control of a predetermined control target based on the digital control signal included in the demodulated signal at the predetermined time interval,
When the control signal cannot be detected within the predetermined time interval, control is performed to stop the operation of the controlled object, and the analog signal included in the demodulated signal is included within the period in which the tone signal is detected. And a control means for controlling the output of the audio signal to the outside of the receiving device. 2. A plurality of antennas for receiving a signal in which the control signal and the audio signal are mixed, and a diversity processing means for performing diversity processing on the signals received by the plurality of antennas and outputting the signals to the demodulating means. The receiving device according to claim 1, comprising. 3. An antenna, a voice input means for generating an analog voice signal according to an input voice, an operating means, and an input from the operating means when a control mode is designated by the operating means. In response to an instruction, a digital control signal is inserted into the transmission signal transmitted from the antenna at a predetermined time interval, and when the voice output mode is designated by the operating means, the voice input means generates the tone signal together with the tone signal. And a control means for inserting the analog audio signal into the transmission signal. 4. A communication system having a transmitting device and a receiving device, wherein the transmitting device includes an antenna, voice input means for generating an analog voice signal according to input voice, operation means, and When the control mode is designated by the operating means, a digital control signal is inserted at a predetermined time interval into a transmission signal transmitted from the antenna in accordance with an instruction input from the operating means, and the operating means outputs a voice signal. A first control unit that inserts the analog voice signal generated by the voice input unit into the transmission signal together with a tone signal when an output mode is designated; and the reception device includes the transmission device. An antenna for receiving the signal transmitted from the demodulator, demodulation means for demodulating the received signal, and detection of the tone signal inserted in the demodulated signal. And tone detection means for, in the period in which the tone signal is not detected, and controls the predetermined control object based on the control signal of the digital included at the predetermined time intervals in the demodulated signal,
When the control signal cannot be detected within the predetermined time interval, control is performed to stop the operation of the controlled object, and the analog signal included in the demodulated signal is included within the period in which the tone signal is detected. And a second control means for controlling the output of the audio signal to the outside of the receiving device.