JP3874645B2 - Reception device, transmission device, and communication system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a receiving apparatus and a transmission capable of appropriately performing control based on a control signal even when there is a reception failure on the receiving side when transmitting and receiving a signal in which a digital control signal and a tone signal are mixed. The present invention relates to an apparatus and a communication system.
[0002]
[Prior art]
For example, in a station premises, for example, as shown in FIG. 5A, a wireless microphone transmits a signal in which a digital control signal and an analog audio signal are mixed, and the signal is received by a receiving device. The system is used.
The control signal is, for example, for turning on / off the bell, and the audio signal is an audio signal emitted by a station employee.
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, for example, as shown in FIG. The bell is switched from on to off at a timing indicating off.
[0003]
[Problems to be solved by the invention]
By the way, the signal received from the wireless microphone by the receiving apparatus may be subject to continuous reception failures as shown in FIG. 5C, for example.
In such a case, the receiving apparatus cannot detect the control signal present during the reception failure, causing a malfunction.
For example, if 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. End up.
[0004]
The present invention has been made in view of the above-described problems of the prior art. When a signal in which a digital control signal and an analog audio signal are mixed is transmitted and received, even if a reception failure occurs, the control signal is used on the receiving side. It is an object of the present invention to provide a receiving apparatus and a communication system that can appropriately perform control of a predetermined control target based thereon.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems of the prior art and achieve the above-described object, a receiving apparatus according to a first invention includes a tone signal, an analog audio signal inserted together with the tone signal, and the analog audio signal. A receiving device for receiving a signal mixed with a digital control signal inserted at a predetermined time interval within a period in which no signal is inserted, the demodulating means for demodulating the received signal, and the demodulated signal Tone detecting means for detecting the tone signal inserted into the signal, and a predetermined value 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. If the control signal cannot be detected within the predetermined time interval, the control target is stopped and the tone signal is detected. Within it is the period, 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.
[0006]
The operation of the receiving apparatus of the first invention is as follows.
In the receiving apparatus, a tone signal, an analog audio 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 audio signal is not inserted are mixed. A signal is received, and the signal is first demodulated by a demodulator.
Then, the tone detection means detects the analog tone signal inserted in the demodulated signal.
Then, the control means controls the 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.
In addition, the control unit performs control to output the analog audio signal included in the demodulated signal to the outside of the receiving device within a period in which the tone signal is detected.
[0007]
The receiving apparatus of the first invention preferably has a plurality of antennas for receiving a signal in which the control signal and the audio signal are mixed, and diversity processing of the signals received by the plurality of antennas and outputs to the demodulating means And a diversity processing means.
[0009]
A communication system according to a second aspect of the present invention is a communication system having a transmission device and a reception device, wherein the transmission device includes an antenna and an audio input unit that generates an analog audio signal corresponding to the input audio. When a control mode is designated by the operation means and the operation means, a digital control signal is inserted into the transmission signal transmitted from the antenna at a predetermined time interval in response to an instruction input from the operation means. And a first control unit that inserts the analog audio signal generated by the audio input unit into the transmission signal together with a tone signal when an audio output mode is designated by the operation unit. An apparatus includes an antenna that receives a signal transmitted from the transmission apparatus, a demodulation unit that demodulates the received signal, and the signal that is inserted into the demodulated signal. Tone detection means for detecting a tone signal, and a predetermined control object 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. When the control signal cannot be detected within the predetermined time interval, control is performed to stop the operation of the control target, and the demodulated signal is converted into the demodulated signal within the period in which the tone signal is detected. And second control means for performing control to output the included analog audio signal to the outside of the receiving device.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is an overall configuration diagram of a communication system 1 according to the present embodiment.
As illustrated in FIG. 1, the communication system 1 includes, for example, a wireless microphone 2, antennas 3_1 to 3_n, antennas 4_1 to 4_n, a reception device 5, a control target device 6, a control target device 7, and a reception unit 8.
Here, the wireless microphone 2 corresponds to the transmission device of the present invention, and the reception device 5 corresponds to the reception device of the present invention.
The communication system 1 is installed in a station premises, for example.
[0011]
Hereinafter, each component shown in FIG. 1 will be described.
[Wireless microphone 2]
The wireless microphone 2 is used by, for example, a station employee (user) in a station premises.
FIG. 2 is a functional block diagram of the wireless microphone 2 shown in FIG.
As shown in FIG. 2, the wireless microphone 2 includes 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 transmission apparatus of the present invention, the microphone 32 corresponds to the voice input means of the transmission apparatus of the present invention, and the operation unit 33 corresponds to the operation means of the transmission apparatus of the present invention. The unit 34 corresponds to the control means of the transmission apparatus of the present invention.
As shown in FIG. 3A, the wireless microphone 2 has a predetermined signal during a period when the tone signal TONE, the analog audio signal SA inserted together with the tone signal TONE, and the analog audio signal SA are not inserted. A signal mixed with the digital control signal SC1 inserted at time intervals is transmitted.
[0012]
The microphone 32 generates an analog audio signal SA corresponding to the audio uttered by the user of the wireless microphone 2.
The operation unit 33 is, for example, an operation button, and outputs an operation signal corresponding 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 it from the antenna 31. .
In addition, when the control mode is designated by the operation signal from the operation unit 33, the control unit 34 performs digital control corresponding to the instruction designated by the operation signal input from the operation unit 33 according to the operation by the user. The signal SC1 is inserted into the transmission signal at a predetermined time interval and transmitted from the antenna 31.
[0013]
[Antennas 3_1 to 3_n, Antennas 4_1 to 4_n]
The antennas 3_1 to 3_n are disposed, for example, in a predetermined area in the station with a predetermined interval.
The antennas 3 </ b> _ <b> 1 to 3 </ b> _n receive the signals shown in FIG. 3A transmitted by the wireless microphone 2 and output them to the antenna mixing / distributing device 20 of the receiving device 5.
[0014]
The antennas 4_1 to 4_n are disposed at a predetermined interval in a region different from the predetermined region in the station.
The antennas 4_1 to 4_n 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.
[0015]
[Receiver 5]
As illustrated in FIG. 1, the reception device 5 includes, for example, an antenna mixing / distributing device 20, a distributing device 21, a distributing device 22, a receiving unit 23, and a receiving unit 24.
The antenna mixing / distributing device 20 receives the received signals received from each of the antennas 3_1 to 3_n, mixes them to generate a received signal S3, and outputs the received signal S3 to the distributor 21.
Specifically, the antenna mixer / distributor 20 multiplies each of the reception signals input from the antennas 3_1 to 3_n by a predetermined coefficient and adds the multiplication results to generate a reception signal S3.
[0016]
The antenna mixer / distributor 20 receives the received signals received from the antennas 4_1 to 4_n, mixes them to generate a received signal S4, and outputs the received signal S4 to the distributor 22. .
Specifically, the antenna mixing / distributing device 20 multiplies each of the reception signals input from the antennas 4_1 to 4_n by a predetermined coefficient and adds the multiplication results to generate the reception signal S4.
[0017]
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 reception unit 23 and the reception unit 24.
[0018]
The distributor 22 distributes the received signal S4 input from the antenna mixing / distributing device 20 and outputs the received signal S4 to the second ports of the receiving unit 23 and the receiving unit 24.
[0019]
The reception unit 23 selects one of the reception signal S3 input from the distributor 21 and the reception signal S4 input from the distributor 22, and performs RF amplification processing, frequency conversion processing, IF amplification on the selected reception signal. Processing and demodulation processing are performed, and an analog audio signal SA included in the received signal is output to the control target device 6, and a control signal SC is generated based on the digital control signal SC1 included in the received signal, and this is controlled. Output to the target device 6.
[0020]
FIG. 4 is a configuration diagram of the receiving unit 23.
As shown in FIG. 4, the receiving unit 23 includes, for example, a selection circuit 51, an RF amplification circuit 52, a frequency conversion circuit 53, an IF amplification circuit 54, a demodulation circuit 55, a switch circuit 56, 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 are included.
Here, the demodulating circuit 55 corresponds to the demodulating means of the present invention, the tone detecting circuit 57 corresponds to the tone detecting means of the present invention, and the control circuit 58 corresponds to the controlling means of the present invention.
[0021]
The RF amplification circuit 52 RF-amplifies the reception signal S3 input to the first port to generate the reception signal S52, and outputs this to the subsequent frequency conversion circuit 53.
[0022]
The frequency conversion circuit 53 generates a reception signal S53 obtained by converting the reception signal S52 input from the RF amplification circuit 52 into an intermediate frequency (IF), and outputs this to the IF amplification circuit 54 in the subsequent stage.
The IF amplifier circuit 54 amplifies the reception signal S53 input from the frequency conversion circuit 53 to generate a reception signal S54 so as to have a good S / N ratio, and outputs this to the demodulation circuit 55 at the subsequent stage.
[0023]
The demodulation circuit 55 demodulates the reception signal S54 input from the IF amplification circuit 54 to generate a reception signal S55, and outputs this to the selection circuit 51 at the subsequent stage.
[0024]
The RF amplifier circuit 62, the frequency converter circuit 63, the IF amplifier circuit 64, and the demodulator circuit 65 are respectively configured for the received signal S4 input to the second port, as described above for the RF amplifier circuit 52, the frequency converter circuit 53, and the IF amplifier circuit 54. The same processing as that of the demodulation circuit 55 is performed, and the reception signal S65 as a result is output to the selection circuit 51.
[0025]
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 on the basis of the control signal from the control circuit 58 and selects the received signal S51 as an audio filter 76, Output to the tone filter 77 and the control filter 78.
[0026]
The audio filter 76 extracts the audio signal SA from the reception signal S51 and outputs it to the switch circuit 56.
The tone filter 77 extracts the tone signal TONE from the reception 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.
[0027]
The switch circuit 56 enters a connected state and a non-connected state based on a 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 from the tone filter 77 is detected to the control circuit 58.
[0028]
The control circuit 58 outputs to the switch circuit 56 a control signal S58 for connecting 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. While the notification signal S57 indicates that the tone signal is not detected, a control signal S58 that disconnects the switch circuit 56 is output to the switch circuit 56.
While the tone detection notification signal S57 indicates that the audio signal is not detected, the control circuit 58 is based on the control signal SC1 included in the reception signal S55 input from the demodulation circuit 55, and the control target device shown in FIG. 6 is generated and output to the control target device 6.
In the present embodiment, the control circuit 58 detects the control signal SC when the control signal SC cannot be detected at the predetermined interval while the tone detection notification signal S57 indicates that no sound signal is detected. Is output to the control target device 6 at a timing when the control target device 7 is turned off.
[0029]
The receiving unit 24 has basically the same calibration as the receiving unit 23 shown in FIG. 4 described above, and controls the control target device 7.
[0030]
[Controlled devices 6, 7]
The control target devices 6 and 7 are a bell or a display device provided with a speaker in the station premises, and are controlled based on the control signal SC from the receiving units 23 and 24, respectively. Output.
[0031]
The receiving unit 8 is an extended receiving unit and has, for example, the configuration shown in FIG.
[0032]
Hereinafter, an operation example of the communication system 1 illustrated in FIG. 1 will be described.
[First operation example]
In this operation example, an operation example when there is no reception failure in the reception signal received by the reception device 5 will be described.
First, for example, the user of the wireless microphone 2 designates the voice output mode by the operation unit 33 during the period from timing t2 to t3 shown in FIG. 3A, inputs voice to the microphone 32, and performs control during other periods. A mode is designated and a predetermined instruction is input from the operation unit 33.
Thereby, based on the control of the control unit 34 shown in FIG. 2, as shown in FIG. 3A, the tone signal TONE is inserted in the period from timing t2 to t3, and in other periods, for example, A signal into which a control signal SC1 instructing on / off at a predetermined time interval is inserted is transmitted from the antenna 31.
[0033]
The transmitted FIG. 3A is received by, for example, the antennas 3_1 to 3_n illustrated in FIG. 1 without reception failure, and is distributed as the received signal S3 through the mixing processing by the antenna mixing / distributing device 20 of the receiving device 5. Is output to the device 21.
The distributor 21 outputs the reception signal S3 to the reception unit 23 and the reception unit 24.
[0034]
Then, the reception signal S3 is subjected to RF amplification processing, frequency conversion processing, IF amplification processing, and demodulation processing in the reception unit 23 shown in FIG. 4 to generate a reception signal S55, and the selection circuit 51 selects the reception signal S55. And output to the sound filter 76, tone filter 77 and control filter 78.
Then, in the audio filter 76, the tone filter 77, and the control filter 78, the audio signal SA, the tone signal TONE, and the control signal SC are extracted from the reception signal S55, respectively, and the audio signal SA is output to the switch circuit 56, and the tone signal TONE is output. The tone detection circuit 57 outputs the control signal SC to the control circuit 58.
[0035]
The tone detection circuit 57 detects the presence or absence of the tone signal TONE, and outputs a 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 generates a control signal SC for turning on the bell of the control target device 6 based on the control signal SC1 indicating ON at the timing t1 shown in FIG. Output to. Accordingly, as shown in FIG. 3B, the bell of the control target device 6 is turned on at the timing t1.
[0036]
Thereafter, at timing t2, the tone detection signal S57 indicates that the tone signal TONE has been detected, and based on this, the control circuit 58 outputs a control signal S58 indicating connection to the switch circuit 56.
As a result, the switch circuit 56 is in a connected state, an analog audio signal SA is output to the control target device 6, and a sound corresponding to the audio signal SA is output from the control target device 6.
Thereafter, the tone detection signal S57 indicates that the tone signal TONE is not detected at the timing t3, and based on this, the control circuit 58 outputs a control signal S58 indicating non-connection to the switch circuit 56.
As a result, the switch circuit 56 is disconnected.
[0037]
The control circuit 58 outputs a control signal SC for turning off the bell of the control target device 6 to the control target device 6 based on the control signal SC1 indicating OFF at the timing t4 shown in FIG. Thereby, as shown in FIG. 3B, the bell of the control target device 6 is turned off at the timing t4.
Subsequently, the control circuit 58 outputs a control signal SC for turning on the bell of the control target device 6 to the control target device 6 based on the control signal SC1 indicating ON at the timing t5 shown in FIG. As a result, as shown in FIG. 3B, the bell of the control target device 6 is turned on at timing t5.
Subsequently, the control circuit 58 outputs a control signal SC for turning off the bell of the control target device 6 to the control target device 6 based on the control signal SC1 indicating OFF at the timing t6 shown in FIG. As a result, as shown in FIG. 3B, the bell of the control target device 6 is turned off at timing t6.
[0038]
[Second operation example]
In this operation example, an operation example when 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 signal received and processed by the receiving device 5 is the same as that shown in FIG. As shown in FIG. 5, reception failure noise occurs between timings t11 to t12.
As a result, the control circuit 58 cannot detect the control signal SC1 indicating OFF that exists at the timings t3 to t4.
In the present embodiment, the control circuit 58 cannot detect the control signal SC1 indicating ON at timings t3 to t4, and outputs the control signal SC indicating OFF to the control target device 6 at the corresponding timing.
Thereby, as shown in FIG. 3B, the bell of the control target device 6 is turned off at the timing t4.
[0039]
Thus, in the communication system 1, when the receiving device 5 cannot detect the control signal SC1 at a predetermined interval, the control signal SC indicating OFF is sent to the control target devices 6 and 7 at a timing scheduled to be detected. Output.
Thereby, even when the control signal SC1 indicating that the operation of the control target devices 6 and 7 included in the received signal is turned off cannot be detected, the operation of the control target devices 6 and 7 can be stopped.
As a result, it is possible to avoid malfunctions such as in the station premises where the bell rings. Therefore, the occurrence of train operation troubles can be suppressed.
[0040]
The present invention is not limited to the embodiment described above.
For example, in the above-described embodiment, the case where the communication system of the present invention is used in a station is illustrated, but the use place is not particularly limited.
Moreover, in embodiment mentioned above, although a bell, a display apparatus, etc. were illustrated as control object apparatuses 6 and 7 (control object of this invention), this is not specifically limited.
[0041]
【The invention's effect】
As described above, according to the present invention, when a signal in which a digital control signal, a tone signal, and an analog audio signal are mixed is transmitted / received, even if a reception failure occurs, the reception side is based on the control signal. It is possible to provide a receiving apparatus and a communication system that can appropriately control a predetermined control target.
[Brief description of the 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.
4 is a block diagram of the receiving unit shown in FIG. 1. FIG.
FIG. 5 is a diagram for explaining a problem of the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Communication system, 2 ... Wireless microphone, 3_1-3_n, 4_1-4_n ... Antenna, 5 ... Reception apparatus, 6, 7 ... Control object apparatus, 8 ... Reception unit, 20 ... Antenna mixing distributor, 21, 22 ... Distribution 23, 24 ... receiving 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

Claims (3)

A receiving device that receives a signal in which a tone signal, an audio 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 mixed. And
Demodulation means for demodulating the received signal;
Tone detection means for detecting the tone signal inserted into the demodulated signal;
Within a period in which the tone signal is not detected, a predetermined control target is controlled based on the digital control signal included in the demodulated signal at the predetermined time interval, and within the predetermined time interval. When the control signal cannot be detected, control is performed to stop the operation of the control target, and the analog audio signal included in the demodulated signal is received in the reception device within a period in which the tone signal is detected. And a control unit that performs control to output to the outside.   2. The apparatus according to claim 1, further comprising: a plurality of antennas that receive a signal in which the control signal and the audio signal are mixed; and diversity processing means that performs diversity processing on the signals received by the plurality of antennas and outputs the signals to the demodulation means. The receiving device described. A communication system having a transmitter and a receiver,
The transmitter is
An antenna,
Voice input means for generating an analog voice signal corresponding to the input voice;
Operation means;
When a control mode is designated by the operation means, a digital control signal is inserted into a transmission signal transmitted from the antenna at a predetermined time interval in response to an instruction input from the operation means, and the operation means A first control unit that inserts the analog audio signal generated by the audio input unit into the transmission signal together with a tone signal when an audio output mode is designated;
The receiving device is:
An antenna for receiving a signal transmitted from the transmission device;
Demodulation means for demodulating the received signal;
Tone detection means for detecting the tone signal inserted into the demodulated signal;
Within a period in which the tone signal is not detected, a predetermined control target is controlled based on the digital control signal included in the demodulated signal at the predetermined time interval, and within the predetermined time interval. When the control signal cannot be detected, control is performed to stop the operation of the control target, and the analog audio signal included in the demodulated signal is received in the reception device within a period in which the tone signal is detected. And a second control means for performing control to be output to the outside.

Images