PTT Switch Box and Call System

Abstract

To provide a PTT switch box that is provided with a howling suppression function and can be used with various types of communication devices, and a call system using the same.SOLUTION: The PTT switch box, which is provided separately from a communication device and incorporates a PTT switch, is provided with howling suppression means to suppress howling and improve the quality of calls. The PTT switch box includes an earphone microphone, a communication device, and a PTT switch box according to any of claims 1 to 11. The PTT switch box can improve the quality of calls by suppressing howling.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a PTT (Push To Talk) switch box and a communication system, and more particularly to a switch box and a communication system that are provided with a howling suppression function and are adapted to be compatible with various types of communication devices. [Background technology]

[0002] A conventional communication system is roughly configured as follows. First, there is an earphone microphone, which the worker wears in his ear. The worker also carries a PTT switch box and a transceiver. The worker talks to a person who has the same equipment by appropriately operating the PTT switch provided in the PTT switch box.

[0003] The applicant of this patent has built and sold this type of communication system by combining an earphone microphone with the product name "Aurocap (registered trademark)", a transceiver, and a PTT switch box. The earphone microphone has a built-in microphone and speaker. Both sound outlets of the microphone and speaker are connected to the shielded space formed between the worker's eardrum, ear canal, and earplug. The microphone collects the sound generated from the eardrum, and the speaker receives the dialogue sound produced by the speaker, and the two communicate simultaneously or alternately.

[0004] As a similar system, for example, a communication system using a Bluetooth (registered trademark) connected PTT switch box manufactured by Icom Inc. has also been disclosed.

[0005] The configuration of this type of communication system is disclosed in, for example, Patent Document 1 and Patent Document 2. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 4781850 [Patent Document 2] JP 2017-215915 A Summary of the Invention [Problem to be solved by the invention]

[0007] The above conventional configuration has the following problems. First, there is a problem that howling occurs in duplex communication, degrading the quality of the call. That is, in a typical earphone microphone, the microphone and speaker are placed far apart, so howling rarely occurs even in duplex communication. In contrast, in the case of the earphone microphone called "Aurocap (registered trademark)" already explained, the microphone and speaker are placed close to each other, so the above-mentioned howling problem occurs. Another problem is that the PTT switch box must be changed every time the type of transceiver is changed. In other words, the PTT switch needs to be set to an appropriate resistance value for accurate switching operation, but this appropriate resistance value differs depending on the type of transceiver. Therefore, every time the type of transceiver is changed, the PTT switch must be replaced with one that has an appropriate resistance value. The same applies when using a communication device other than a transceiver, such as a mobile phone.

[0008] The present invention has been made based on the above points, and its object is to provide a PTT switch box that has a howling suppression function and is compatible with various types of communication devices, and a communication system that uses such a PTT switch box. [Means for solving the problem]

[0009] In order to solve the above problems, the PTT switch box according to claim 1 of the present invention is a PTT switch box that is provided separately from a communication device and has a built-in PTT switch, and is provided with a howling suppression means. The appropriate resistance value of the PTT switch is configured to be changeable according to the type of the communication device, and a plurality of types of parameter sheets are prepared in advance according to the type of the communication device, and the appropriate resistance value is changed by selecting a parameter sheet corresponding to the type of the communication device. It is characterized by the above. The PTT switch box according to claim 2 is the PTT switch box according to claim 1, The appropriate set value of the howling suppression means is configured to be changeable in accordance with the type of the communication device, and a plurality of types of parameter sheets are prepared in advance in accordance with the type of the communication device, and the appropriate set value is changed by selecting a parameter sheet corresponding to the type of the communication device. It is characterized by the above. The PTT switch box according to claim 3 is the PTT switch box according to claim 1, A VOX means is provided, and the appropriate set value of the VOX means is configured to be changeable according to the type of the communication device, and a plurality of types of parameter sheets are prepared in advance according to the type of the communication device, and the appropriate set value is changed by selecting a parameter sheet corresponding to the type of the communication device. It is characterized by the above. A PTT switch box according to claim 4 is a PTT switch box according to any one of claims 1 to 3, The plurality of types of parameter sheets are stored in a storage unit in advance, and an arbitrary parameter sheet is selected from the plurality of types of parameter sheets by operating a personal computer. It is characterized by the above. The PTT switch box according to claim 5 is the same as claims 1 to 5. 3 In the PTT switch box according to any one of the above, A plurality of types of switches are provided, and an arbitrary parameter sheet can be selected from the plurality of types of parameter sheets by operating the plurality of types of switches alone or in combination. It is characterized by the above. The PTT switch box according to claim 6 further comprises: In the PTT switch box according to any one of claims 1 to 5, the communication device is a transceiver. It is characterized by the above. Moreover, the communication system according to claim 7 comprises: An earphone microphone, a communication device, and a PTT switch box according to any one of claims 1 to 6. It is characterized by the above. Moreover, the communication system according to claim 8 comprises: 8. The communication system according to claim 7, wherein the communication device is a transceiver. It is characterized by the above. Moreover, the communication system according to claim 9 comprises: In the communication system according to claim 7 or 8, the earphone microphone has a built-in microphone and a speaker. It is characterized by the above. Moreover, the communication system according to claim 10 comprises: In the communication system according to any one of claims 7 to 9, the earphone microphone and the PTT switch box are configured to be capable of communicating with each other by wire or wirelessly. It is characterized by the above. Moreover, the communication system according to claim 11 comprises: In the communication system according to any one of claims 7 to 10, the communication device and the PTT switch box are configured to be capable of communicating with each other by wire or wirelessly. It is characterized by the above. Effect of the Invention

[0010] As described above, according to the PTT switch box of claim 1 of the present invention, the PTT switch box is provided separately from the communication device and has a built-in PTT switch, and is configured to have a howling suppression means, so that howling can be suppressed and the quality of the call can be improved. According to the PTT switch box of claim 2, since the PTT switch box of claim 1 is provided with a VOX means, it becomes possible to change the PTT switch by voice, and thus the complexity can be eliminated. Furthermore, according to the PTT switch box of claim 3, in the PTT switch box described in claim 1 or claim 2, the appropriate resistance value of the PTT switch is configured to be changeable according to the type of the communication device, so that even if the type of communication device is changed, there is no need to change the PTT switch box, thereby increasing versatility. Furthermore, according to the PTT switch box of claim 4, in the PTT switch box described in any of claims 1 to 3, the appropriate setting value of the howling suppression means is configured to be changeable according to the type of the communication device, so that even if the type of communication device is changed, there is no need to change the PTT switch box, thereby increasing versatility. Furthermore, according to the PTT switch box of claim 5, in the PTT switch box described in any of claims 1 to 4, the appropriate setting value of the VOX means is configured to be changeable according to the type of the communication device, so that even if the type of communication device is changed, there is no need to change the PTT switch box, thereby increasing versatility. According to the PTT switch box of claim 6, in the PTT switch box of claim 3, a plurality of types of parameter sheets are prepared in advance according to the type of the communication device, and the appropriate resistance value is changed by selecting a parameter sheet corresponding to the type of the communication device, so that the above-mentioned effect can be achieved with a simple configuration. According to the PTT switch box of claim 7, in the PTT switch box of claim 4, a plurality of types of parameter sheets are prepared in advance according to the type of the communication device, and the appropriate setting value is changed by selecting a parameter sheet corresponding to the type of the communication device, so that the above effect can be achieved with a simple configuration. According to the PTT switch box of claim 8, in the PTT switch box of claim 5, a plurality of parameter sheets are prepared in advance according to the type of the communication device, and the appropriate setting value is changed by selecting a parameter sheet corresponding to the type of the communication device, so that the above effect can be achieved with a simple configuration. According to the PTT switch box of claim 9, in the PTT switch box according to any one of claims 6 to 8, the plurality of parameter sheets are stored in advance in a storage unit, and an arbitrary parameter sheet is selected from the plurality of parameter sheets by operating a personal computer, so that the above-mentioned effect can be achieved with a simple configuration. According to the PTT switch box of claim 10, the PTT switch box of claim 9 is provided with a plurality of types of switches, and any parameter sheet can be selected from the plurality of parameter sheets by operating the plurality of types of switches alone or in combination. Therefore, the above effect can be achieved with a simple configuration, and the parameter sheet selection work can be performed, for example, even on-site. According to a PTT switch box of claim 11, in the PTT switch box according to any one of claims 1 to 10, the communication device is a transceiver, and the above-mentioned effects can be obtained in such a case as well. Furthermore, according to the call system of claim 12, the system is configured to include an earphone microphone, a communication device, and a PTT switch box described in any one of claims 1 to 11, so that howling can be suppressed and call quality can be improved. According to a communication system of claim 13, in the communication system of claim 12, the communication device is a transceiver, and the above-mentioned effects can be obtained in such a case as well. According to the communication system of claim 14, in the communication system of claim 12 or 13, the earphone microphone has a built-in microphone and speaker, and in such a case, the above-mentioned effects can be achieved. Furthermore, according to the call system of claim 15, in the call system described in any one of claims 12 to 14, the earphone microphone and the PTT switch box are configured to be capable of communication either wired or wirelessly, thereby improving usability. Furthermore, according to the call system of claim 16, in the call system described in any one of claims 11 to 15, the communication device and the PTT switch box are configured to be able to communicate either wired or wirelessly, thereby improving usability. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 shows a first embodiment of the present invention, and shows a state in which a call is being made in a factory under a loud noise. [Diagram 2] FIG. 1 is a diagram showing a first embodiment of the present invention, and is a perspective view of a PTT switch box viewed from the front side. [Diagram 3] FIG. 1 is a diagram showing a first embodiment of the present invention, and is a perspective view of a PTT switch box viewed from the rear side. [Figure 4] FIG. 1 shows a first embodiment of the present invention, and is an oblique view of a PTT switch box viewed from the front side in a state in which a PTT switch box and an earphone microphone are connected by a cable and also a PTT switch box and a transceiver are connected by a cable. [Diagram 5] FIG. 1 shows a first embodiment of the present invention, and is an oblique view of a PTT switch box viewed from the front side in a state in which wireless communication is established between the PTT switch box and the earphone microphone and also between the PTT switch box and the transceiver. [Figure 6] FIG. 1 is a diagram showing a first embodiment of the present invention, and is a perspective view of a PTT switch box viewed from the front side in a state in which the PTT switch box is being charged. [Figure 7]FIG. 1 is a diagram showing a first embodiment of the present invention, and is a perspective view of an earphone microphone as viewed from the front side. [Figure 8] FIG. 1 is a block diagram showing a circuit configuration of a PTT switch box according to a first embodiment of the present invention. [Figure 9] FIG. 1 is a block diagram showing a configuration of a howling suppression means of a PTT switch box according to a first embodiment of the present invention. [Figure 10] FIG. 1 is a block diagram showing a detailed configuration of a howling suppression means of a PTT switch box according to a first embodiment of the present invention. [Figure 11] FIG. 1 is a diagram showing a first embodiment of the present invention, illustrating a detailed configuration of a switch resistance changing circuit. [Figure 12] FIG. 1 is a diagram showing the first embodiment of the present invention, and is a flowchart showing information processing of a howling suppression circuit. [Figure 13] FIG. 1 illustrates the first embodiment of the present invention, and shows an example of a parameter sheet stored in a storage unit of a PTT switch box. [Figure 14] FIG. 11 is a perspective view showing a state in which a PTT switch box and an earphone are connected wirelessly in accordance with a second embodiment of the present invention. [Figure 15] FIG. 11 is a diagram showing a second embodiment of the present invention, and is a perspective view of an earphone microphone viewed from the front side. [Figure 16] FIG. 11 is a diagram showing a second embodiment of the present invention, and is a perspective view of an earphone microphone viewed from the rear side. [Figure 17] FIG. 13 is a diagram showing a second embodiment of the present invention, and is a perspective view seen from the front side of an earphone microphone in a state in which the earphone microphone and the earphone microphone worn on the other ear are connected by a cable. [Figure 18] FIG. 11 shows a second embodiment of the present invention, and is a perspective view of the earphone microphone viewed from the front side in a state in which the earphone microphone is being charged with a charging cable connected thereto. [Figure 19] FIG. 11 is a perspective view showing a state in which the earphone microphone is attached to both ears, according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A first embodiment of the present invention will be described below with reference to Fig. 1 to Fig. 13. Fig. 1 shows a state in which a call is being made between two remote locations in a noisy factory 1 using a PPT switch box and a communication system according to this embodiment. In the two remote locations in the factory 1, workers 3 and 5 are making a call while performing separate tasks.

[0013] The worker 3 carries a transceiver (communication device) 11, a PTT switch box 13, and an earphone microphone 15. The transceiver 11 and the PTT switch box 13 are connected via a cable 17. The PTT switch box 13 and the earphone microphone 15 are connected via a cable 19. The worker 5 also carries a similar transceiver 11, a PTT switch box 13, and an earphone microphone 15.

[0014] The PTT switch box 13 is configured as shown in Figures 2 and 3. First, there is a housing 21, and on the front side of this housing 21, a power switch 23, a power ON display unit 25, a PTT switch 27, a PTT lock switch 29, a microphone mute ON / OFF switch 31, and a PTT ON display unit 33 are provided.

[0015] A plurality of display units 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, and 63 (12 in this embodiment) are provided on the front surface of the housing 21. In addition, a MODE switch 71, a Bluetooth (registered trademark) switch 73, a VOX (Voice Operation Transmission) ON / OFF switch 75, and a MODELOCK switch 77 are provided below the 12 display units 41 to 63. Display units 81, 83, 85, and 87 are provided below the MODE switch 71, the Bluetooth (registered trademark) switch 73, the VOX ON / OFF switch 75, and the MODELOCK switch 77, respectively.

[0016] Additionally, an earphone / microphone connecting jack 91 is provided on the top surface of the outer casing 21, and a transceiver connecting jack 93 and a cable connecting jack 95 are provided on the side surface of the outer casing 21. A cap 97 is detachably provided on the top surface of the outer casing 21, and when the earphone / microphone connecting jack 91 is not in use (when used wirelessly), this cap 97 closes the earphone / microphone connecting jack 91.

[0017] As shown in Fig. 3, a clip 101 is provided on the back side of the outer casing 21. As shown in Fig. 1, the PTT switch box 13 is fixed via the clip 101 to, for example, a breast pocket of the work clothes 103 of the workers 3 and 5.

[0018] As shown in Fig. 4, earphone microphone connecting cable 111 is connected to the earphone microphone connecting jack 91, and transceiver connecting cable 113 is connected to the transceiver connecting jack 93. Also, as shown in Fig. 5, when used wirelessly, the earphone microphone connecting jack 91 and the transceiver connecting jack 93 are not used. Also, as shown in Fig. 6, when charging, a charging cable 115 is connected to the cable connecting jack 95. A cable connected to a personal computer, which will be described later, is also connected to the cable connecting jack 95.

[0019] As shown in Figs. 7 and 9, earphone microphone 15 is composed of housing 121, microphone 123 housed within housing 121, speaker 125 also housed within housing 121, and the like.

[0020] Next, the circuit configuration of the PTT switch box 13 will be described with reference to Fig. 8. The PTT switch box 13 includes a CPU (Central Processing Unit) 161, an EEPROM 163, a VOX 1165, a VOX 2167, a CODEC 169, a Bluetooth (registered trademark) module 171, an antenna matching circuit 173, a Bluetooth (registered trademark) SLAVE 175, a BPF (Band Pass Filter) 177, a headphone amplifier 181, an electronic volume 183, a microphone amplifier 185, an SPK DET 187, an amplifier 189, an electronic volume 191, an input switching circuit 193, a charging management IC 195, a power supply control circuit 197, a Vdd regulator 199, an AVDD regulator 201, and a lithium polymer battery 203.

[0021] The Bluetooth (registered trademark) module 171 and the antenna matching circuit 173 function when wirelessly communicating between the PTT switch box 13 and the transceiver 11. The Bluetooth (registered trademark) SLAVE 175 and the BPF 177 function when wirelessly communicating between the earphone microphone 15 and the PTT switch box 13.

[0022] Moreover, when performing wired communication between the PTT switch box 13 and the transceiver 11, the transceiver connection jack 93 already described is used. Moreover, when performing wired communication between the earphone microphone 15 and the PTT switch box 13, the earphone microphone connection jack 91 already described is used. Furthermore, when charging the lithium polymer battery 203, the cable connection jack 95 is used. Moreover, a cable (not shown) for connecting to a personal computer 255 is also connected to the cable connection jack 95. The input switching circuit 193 switches between the wireless input from the earphone microphone 15 via the Bluetooth (registered trademark) SLAVE 175 and BPF 177 and the wired input from the earphone microphone 15 via the earphone microphone connection jack 91.

[0023] In addition, the power switch 23, power ON display 25, PTT switch 27, PTT lock switch 29, microphone mute ON / OFF switch 31, PTT ON display 33, and displays 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, and 63 are provided, as already explained. Also provided are a MODE switch 71, a Bluetooth (registered trademark) switch 73, a VOX ON / OFF switch 75, and a MODE LOCK switch 77. Also provided are displays 81, 83, 85, and 87, respectively.

[0024] As shown in Fig. 9, the CPU 161 is provided with a feedback suppression circuit 211, a program / parameter storage device 213, a feedback setting value switching circuit 214, a switch resistance switching circuit 215, and a VOX setting value switching circuit 217. The program / parameter storage device 213 stores a feedback suppression program and a plurality of parameter sheets, which will be described later. The feedback setting value switching circuit 214 switches the feedback setting value based on the selection of the parameter sheet. The switch resistance switching circuit 215 switches the resistance value of the PTT switch 27 based on the selection of the parameter sheet. The VOX setting value switching circuit 217 switches the setting values ​​of the VOX1165 and VOX2167 based on the selection of the parameter sheet. 9 shows some of the various circuits of the CPU 161 shown in FIG.

[0025] As shown in FIG. 10, the howling suppression circuit 211 includes a speaker / microphone gain linked limiter 221, a microphone in gain circuit 223, a microphone AEC circuit 225, a microphone NS circuit 227, a speech sense circuit 229, and a microphone out gain circuit 231, and is further composed of a speaker in gain circuit 235, a speaker NS circuit 237, an AGC circuit 239, an equalizer gain circuit 241, a speaker out gain circuit 243, etc. Furthermore, on the transceiver 11 side, a PTT activation circuit 233 and a speaker volume circuit 245 are provided.

[0026] The howling set value switching circuit 214 is a part that performs software processing in the CPU 161, and thereby the howling set value is appropriately switched. The switch resistance changeover circuit 215 is a part that performs software processing in the CPU 161, and a part that actually performs the switching operation based on the switch resistance changeover circuit 215 is provided separately as a switch resistance changeover operation unit 215' as shown in Figures 8 and 11. The switch resistance changeover operation unit 215' is provided with a plurality of fixed resistors 216. A signal is input from the switch resistance changeover circuit 215 of the CPU 161 via an input line 220, and the resistance is changed over. A signal is output from the switch resistance changeover circuit 215 to the transceiver 11 via an output line 218. In addition, the VOX set value switching circuit 217 is a part that performs software processing in the CPU 161, and based on this, a signal is output to an operational amplifier and a volume (not shown) provided in the VOX 1165 and VOX 2167 shown in Figure 8, and the VOX set value is appropriately switched.

[0027] The information processing by the howling suppression circuit 211 described with reference to FIGS. 9 and 10 will be described with reference to FIG. First, as shown in FIG. 12(a), in step S1, a signal is input via microphone 147 of earphone microphone 15, and in step S2, the input signal is amplified. Then, the process proceeds to step S3, where an excessive input limiting process is executed. Then, the process proceeds to step S4, where an input signal is time-divided. Then, the process proceeds to step S5, where an A / D conversion process is executed. Then, the process proceeds to step S6, where an acoustic signal element conversion process is executed. Then, the process proceeds to step S7, where an input / output signal comparison process / main input signal extraction and unnecessary signal removal process are executed. Then, the process proceeds to step S8, where a D / A conversion process is executed. Then, the process proceeds to step S9, where a signal gain adjustment process is executed, and then, the process proceeds to step S10, where the signal is output to transceiver 11.

[0028] In parallel with the above information processing, processing as shown in Fig. 12(b) is performed. First, in step S11, a signal from the transceiver 11 is input, and the process proceeds to step S12 where signal gain adjustment is performed. Next, the process proceeds to step S13 where non-audio frequency signal suppression processing is performed. Next, the process proceeds to step S14 where excessive output limiting processing is performed. Next, the process proceeds to step S15 where output signal amplification processing is performed, and then the process proceeds to step S16 where the signal is output to the speaker 149 of the earphone microphone 15. As already explained, in step S7 of FIG. 12(a), input / output signal comparison processing / main input signal extraction / unnecessary signal removal processing is executed, where the input signal is the input signal from the microphone 123, and the output signal is the output signal from the speaker 125.

[0029] As already mentioned, the program parameter storage device 213 shown in Fig. 9 stores a predetermined feedback suppression program, and also stores a plurality of parameter sheets 251 shown in Fig. 13 (15 in this embodiment). The parameter sheets 251 have various parameters selected according to the type of transceiver 11 written therein. The parameter sheet 251 shown in Fig. 13 is an example. When the PTT switch box 13 is shipped from the factory, an appropriate parameter sheet 251 is selected according to the type of transceiver 11 used. Also, a parameter sheet 251 that is required may be selected as appropriate at the site where the PTT switch box 13 is used.

[0030] The various parameters include the optimum resistance value of the PTT switch 27, the optimum setting value used in the howling suppression program, the optimum setting value used in VOX1165 and VOX2167, and the like. Incidentally, the parameter sheet 251 shown in FIG. 13 is merely an example.

[0031] The howling suppression circuit 211 uses a howling suppression program stored in the program / parameter storage device 213 and various parameters written in a selected parameter sheet 251 to exert a howling suppression function.

[0032] The switch resistance switching circuit 215 performs a process of switching the resistance value of the PTT switch 27 to the appropriate resistance value written in the selected parameter sheet 251. The VOX setting value switching circuit 217 performs a process of switching the setting values ​​used in the VOX1165 and VOX2167 to the setting values ​​written in the selected parameter sheet 251.

[0033] The parameter sheet 251 is selected as follows. As shown in Fig. 8, a personal computer 255 is connected to the cable connection jack 95 of the PTT switch box 13 at a factory or on-site. Then, by operating the personal computer 255, any one of the 15 parameter sheets 251 is selected. The contents of the selected parameter sheet 251 are read out to the EEPROM 163 and expanded.

[0034] Also, among the 15 parameter sheets 251, the parameter sheets 251 with sheet numbers 1 to 6 can be selected by operating the power switch 23, the PTT switch 27, the PTT lock switch 29, the microphone mute ON / OFF switch 31, and the MODE switch 71, which have already been described. First, the power switch 23 and the MODE switch 71 are pressed simultaneously. Next, by operating the MODE switch 71 alone, one of the parameter sheets 251 with sheet numbers 1 to 3 is selected. Also, by pressing the power switch 23 and the PTT switch 27 simultaneously, the parameter sheet 251 with sheet number 4 is selected, by pressing the power switch 23 and the PTT lock switch 29 simultaneously, the parameter sheet 251 with sheet number 5 is selected, and by pressing the power switch 23 and the microphone mute ON / OFF switch 31 simultaneously, the parameter sheet 251 with sheet number 6 is selected.

[0035] The operation of the above configuration will now be described. For example, when the PTT switch box 13 is shipped from the factory, the appropriate resistance value of the PTT switch 27, the appropriate setting value used in the howling suppression program, and the appropriate setting values ​​used in VOX1165 and VOX2167 are selected and set according to the type of transceiver 11 used at the shipping destination. This is done by connecting a personal computer 255 to the PTT switch box 13 and selecting an arbitrary parameter sheet 251 from among a plurality of parameter sheets 251 stored in the program / parameter storage device 213 of the CPU 161. The selected parameter sheet 251 is called up and loaded into the EEPROM 113.

[0036] The parameter sheets 251 can be selected on-site after shipment from the factory. At that time, a personal computer 255 can be used, or, in the case of parameter sheets 251 with sheet numbers 1 to 6, the power switch 23, PTT switch 27, PTT lock switch 29, microphone mute ON / OFF switch 31, and MODE switch 71 can be operated.

[0037] By selecting any one of the parameter sheets 251, the appropriate resistance value of the PTT switch 27 according to the type of transceiver 11 to be used at the shipping destination, the appropriate setting value used in the howling suppression program, and the appropriate setting values ​​used in VOX1165 and VOX2167 are selected. The switch resistance changeover circuit 215 performs a process of switching to the selected appropriate resistance value of the PTT switch 27. The howling setting value changeover circuit 214 performs a process of switching to the selected appropriate setting value. The VOX setting value changeover circuit 217 performs a process of switching to the selected appropriate setting value.

[0038] Each of the above switching processes will now be described in detail. First, the parameter sheet 251 in FIG. 13 has an item called "PTT switch resistance" as a parameter related to the appropriate resistance value of the PTT switch 27. In this "PTT switch resistance", a pull-down resistance is selected. Here, "pull down=1" is selected. There are three types of pull-down: "0", "1", and "2". When "pull down=1" is selected, 10 kΩ is set. Such a switching process is performed by the switch resistance switching circuit 215 shown in FIG. 11.

[0039] 13, parameters related to appropriate setting values ​​used in the feedback suppression program include "Description of MIC input conditions", "Receiver input conditions", "Related to acoustic algorithm", "NS (MIC)", "NS (SPK)", "AGC", "Related to acoustic filter", "EQ", "Description of MC output conditions", and "Receiver output conditions". Among these, for example, "AGC" relates to automatic volume control On / Off, and "AGC enable=0" is selected here. AGC enable has "0" and "1", and when "AGC enable=0" is selected, 0=disable is set. Such switching processing is performed by the feedback setting value switching circuit 214 through software processing.

[0040] Incidentally, although the parameter sheet 251 shown in FIG. 13 does not include parameters relating to the appropriate setting values ​​used by VOX1165 and VOX2167, it is basically configured in the same way, and based on the parameters relating to the appropriate setting values ​​used by VOX1165 and VOX2167, the VOX setting value switching circuit 217 performs switching processing using the operational amplifiers and volume adjustments provided in each of VOX1165 and VOX2167.

[0041] Thereafter, at the work site shown in FIG. 1, a predetermined PTT switch operation, howling suppression program processing, and VOX operation are performed based on the appropriate resistance value of the PTT switch 27 selected above, the appropriate setting value used in the howling suppression program, and the appropriate setting values ​​used in VOX1165 and VOX2167.

[0042] As described above, according to this embodiment, the following effects can be obtained. First, when using the earphone microphone 15 with the microphone 147 and speaker 149 built in close proximity to each other, feedback in duplex communication can be suppressed. This is because the PTT switch box 11 is provided with a feedback suppression means. Furthermore, even if the type of transceiver 11 used is changed, a common PTT switch box 13 can be used. This is because a plurality of parameter sheets 251 are prepared in advance for a plurality of types of transceivers 13, and by selecting an arbitrary parameter sheet 251 from among them, it is possible to select and set the appropriate resistance value of the PTT switch 27 corresponding to the transceiver 11 used, the appropriate setting value used in the howling suppression program, and the appropriate setting value used in VOX1165 and VOX2167.

[0043] Next, a second embodiment of the present invention will be described with reference to Figures 14 to 19. In the first embodiment, the transceiver 11 and the PTT switch box 13 are connected via a cable 17, and the PTT switch box 13 and the earphone microphone 15 are connected via a cable 19, but in this embodiment, the connection between the TT switch box 13 and the earphone microphone 15 is wireless.

[0044] Moreover, the earphone microphone 15' in this embodiment is of a wireless-only type, and is composed of an ear hook portion 301 and an ear insertion portion 303, as shown in Figs. 15 to 18. The ear hook portion 301 and the ear insertion portion 303 are connected via a cable 305. The ear hook portion 301 is provided with switches 307, 309, and 311. The ear hook portion 301 is also provided with a cable connection jack 321 and a charging cable connection jack 323. The cable connection jack 321 and the charging cable connection jack 323 are closed by a cap 325. The earphone microphone 15' has a built-in microphone, speaker, etc., which are not shown.

[0045] As shown in Fig. 17, for example, earphone microphone 15 described in the first embodiment is connected to cable connecting jack 321 via cable 19. Fig. 19 shows a state in which earphone microphones 15', 15 are connected via cable 19. Furthermore, as shown in Fig. 18, a charger (not shown) and charging cable connecting jack 323 are connected via charging cable 353. The other configurations are the same as those of the first embodiment, and the same parts in the drawings are given the same reference numerals and their explanation is omitted.

[0046] Therefore, the same effects as those of the first embodiment can be achieved, and since the wireless system eliminates the need for cables, the configuration is simplified and ease of use is improved.

[0047] It should be noted that the present invention is not limited to the first and second embodiments. First, in the first and second embodiments, a transceiver has been taken as an example of a communication device, but other types of communication devices such as a mobile phone may also be used. In the second embodiment, the PTT switch box and the earphone microphone are connected wirelessly, but the PTT switch box and the transceiver may also be connected wirelessly. In the first and second embodiments, the parameter sheet is manually selected according to the type of communication device, and the appropriate resistance value of the PTT switch, the appropriate setting value used in the feedback suppression program, and the appropriate setting value used in the VOX are rewritten, but the present invention is not limited to this. For example, the type of communication device may be automatically determined, and the appropriate resistance value of the PTT switch, the appropriate setting value used in the feedback suppression program, and the appropriate setting value used in the VOX may be automatically rewritten. The other configurations shown in the drawings are merely examples. [Industrial Applicability]

[0048] The present invention relates to a PTT switch box and a communication system, in particular, to a system that is equipped with a howling suppression function and is designed to be compatible with various types of communication devices, and is suitable for performing duplex communication in various noisy locations. [Explanation of symbols]

[0049] 11 Transceiver (communication device) 13 PTT switch box 15 Earphone Microphone 27 PTT switch 29 PTT lock switch 161 CPU 165 VOX1 167 VOX2 211 Howling suppression circuit 213 Feedback suppression program memory unit 214 Howling setting value switching circuit 215 Switch Resistor Changeover Circuit 215´ Switch resistor changeover section 217 VOX setting value switching circuit 251 Parameter Sheet

Claims

1. In a PTT switch box having a built-in PTT switch provided separately from a communication device, A howling suppression means is provided, The appropriate resistance value of the PTT switch is changeable according to the type of the communication device, A PTT switch box characterized in that a plurality of types of parameter sheets are prepared in advance according to the type of the communication device, and the appropriate resistance value is changed by selecting a parameter sheet corresponding to the type of the communication device.

2. 2. The PTT switch box according to claim 1, a suitable set value of the howling suppression means can be changed according to the type of the communication device, A PTT switch box characterized in that a plurality of types of parameter sheets are prepared in advance according to the type of the communication device, and the appropriate setting value is changed by selecting a parameter sheet corresponding to the type of the communication device.

3. 2. The PTT switch box according to claim 1, A VOX means is provided, The appropriate setting value of the VOX means is changeable according to the type of the communication device, A PTT switch box characterized in that a plurality of types of parameter sheets are prepared in advance according to the type of the communication device, and the appropriate setting value is changed by selecting a parameter sheet corresponding to the type of the communication device.

4. In the PTT switch box according to any one of claims 1 to 3, The plurality of types of parameter sheets are stored in a storage unit in advance, and an arbitrary parameter sheet is selected from the plurality of types of parameter sheets by operating a personal computer.

5. In the PTT switch box according to any one of claims 1 to 3, A PTT switch box is provided with a plurality of types of switches, and is configured so that an arbitrary parameter sheet can be selected from among the plurality of types of parameter sheets by operating the plurality of types of switches alone or in combination.

6. A PTT switch box according to any one of claims 1 to 5, A PTT switch box, wherein the communication device is a transceiver.

7. A communication system comprising an earphone microphone, a communication device, and a PTT switch box described in any one of claims 1 to 6.

8. In the call system according to claim 7, A communication system, wherein the communication device is a transceiver.

9. In the call system according to claim 7 or claim 8, This communication system is characterized in that the earphone microphone has a built-in microphone and speaker.

10. A communication system according to any one of claims 7 to 9, A communication system characterized in that communication between the earphone microphone and the PTT switch box is possible either by wire or wirelessly.

11. In the communication system according to any one of claims 7 to 10, A communication system characterized in that communication between the communication device and the PTT switch box is possible either by wire or wirelessly.

Images