JP3765749B2 - Wireless communication device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wireless communication device.
[0002]
[Prior art]
A DTMF (Dual Tone Multi Frequency) signal system used in telephone communication or wireless communication is configured as follows.
[0003]
This DTMF signal system is an audio frequency band signal system configured to transmit two tones of a low frequency group (low group) and a high frequency group (high group) simultaneously. Each of these low and high frequency groups is composed of four audio frequency band frequency tones, none of which are in an articulatory relationship.
[0004]
In this DTMF signal, the four frequencies in the low group are, for example, 697 Hz, 770 Hz, 852 Hz, and 941 Hz, and the four frequencies in the high group are 1209 Hz, 1336 Hz, 1477 Hz, and 1633 Hz. Then, one frequency in each of the low group and the high group is combined, and a DTMF signal formed by the combination is converted into, for example, numbers “0” to “9” of each key of the operation keys, “*”, “#” ”And the like, and each function signal corresponds.
[0005]
Due to the combination of the two frequencies and the transmission conditions as described above, the DTMF signal is rarely generated in the natural world and can be clearly distinguished from natural sounds such as human voices. It can be multiplexed and transmitted on a normal audio frequency signal, and separation on the receiving side is relatively easy.
[0006]
FIG. 3 shows a conventional wireless communication device configured to be able to transmit and receive the above-described DTMF signal. This wireless communication device prohibits transmission of an audio signal from the antenna 3, the transmission / reception circuit 26, the display unit 27 that displays a frequency, the operation key 4 that generates a control signal based on a key operation, and the microphone 13. The wireless communication device body 2 includes a microphone signal mute switch 23, a microcomputer (hereinafter referred to as a CPU) 25 for controlling them, and an external microphone 1 electrically connected to the wireless communication device body 2. Yes. The external microphone 1 further includes a microphone 13 and a PTT (Push To Talk) switch 5.
[0007]
The wireless communication device shown in FIG. 3 can perform transmission by pressing the PTT switch 5. During this transmission, the operation key 4 is always checked by the CPU 24. Accordingly, when it is determined that the key of the operation key 4 has been pressed by this check operation, the operation key 4 becomes a key for transmitting a DTMF signal, and a DTMF signal of a code based on the key operation of the operation key 4 is transmitted. It is configured as follows.
[0008]
In the wireless communication apparatus of FIG. 3 configured as described above, as shown in the flowchart of FIG. 4, the CPU 24 always checks the key of the operation key 4 (step S5) while the PTT switch 5 is pressed and transmission is in progress (step S2). When the operation key 4 is determined to have been pressed, the operation key 4 becomes a key for sending out a DTMF signal (step S6). Next, the microphone signal mute switch 23 is turned on (step S7). The transmission of the audio signal from the microphone 13 is prohibited, and the DTMF signal of the code corresponding to the pressed key of the operation key 4 is transmitted (step S8).
[0009]
Also, some conventional wireless communication devices as shown in FIG. 3 have a key lock function. This key lock function locks operation of the operation key 4 during reception, for example, direct input of a frequency, on / off of a tone signal, or on / off of a frequency shift. On the other hand, there is no one that has a function to lock against transmission of a DTMF signal during transmission.
[0010]
[Problems to be solved by the invention]
In the conventional wireless communication apparatus shown in FIG. 3, when the operation key 4 is pressed during transmission, a DTMF signal is transmitted, and at the same time, an audio signal from the microphone 13 is sent to the transmission / reception circuit 26 by the microphone signal mute switch 23. Input is prohibited.
[0011]
Accordingly, only the DTMF signal is transmitted while the DTMF signal is being transmitted, and the audio signal from the microphone 13 is not transmitted. For this reason, only the DTMF signal is received on the other side.
[0012]
For example, when the wireless communication device main body 2 is placed in a pocket or bag and the PTT switch 5 of the external microphone 1 is pressed to transmit an audio signal from the microphone 13, If the key of the operation key 4 of the machine body 2 is pressed by something and it enters into an erroneous operation state, the DTMF signal starts to be transmitted, and at the same time, the call is interrupted, and the other party receives only the DTMF signal. It was.
[0013]
In addition, when the key lock function during reception, which has been implemented in the past, is turned on, if the operation key being transmitted is also key-locked, it is necessary to change the setting every time a transmission operation is performed, and the operability deteriorates. The key lock during transmission was not performed.
[0014]
The present invention prevents unnecessary DTMF signals from being transmitted when an operation key is accidentally pressed during transmission, so that only the DTMF signal is sent to the other party and the call is interrupted. An object of the present invention is to provide a wireless communication device.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, in the wireless communication device of the present invention, an external microphone including a microphone, a first PTT switch, and a first operation key that generates a control signal based on a key operation; The second operation key for generating a control signal based on the PTT switch and the key operation, the DTMF signal generating means for transmitting the DTMF signal based on the key operation of the first or second operation key during transmission, and the audio signal from the microphone In a wireless communication device comprising a wireless communication device main body comprising a microphone signal mute switch for prohibiting transmission of a signal and a CPU for controlling them, and configured to electrically connect an external microphone, the first on the external microphone side The input signal from the PTT switch and the input signal from the second PTT switch on the wireless communication device main body side Transmission operation confirmation means configured to detect each of them independently and distinguish them, and the first or second PTT switch on the side different from the first or second PTT switch confirmed to be transmitting by the transmission operation confirmation means. And a DTMF key lock unit having a function of prohibiting transmission of a DTMF signal to the operation key 2.
[0016]
Further, it is possible to detect whether or not an external microphone is electrically connected to the wireless communication device main body, and to turn on / off the DTMF key lock means.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on examples with reference to the drawings.
In FIG. 1, reference numeral 1 denotes an external microphone, which includes a microphone 13, a first PTT switch 11, and a first operation key 12 that generates a control signal based on a key operation and supplies the control signal to the CPU 24 of the wireless communication device body 2. is doing. The external microphone is configured to be used by being electrically connected to the wireless communication device main body 2.
[0018]
The wireless communication device body 2 in FIG. 1 generates a control signal based on the antenna 3, the transmission / reception circuit 26, the display means 27 for displaying the frequency, the second PTT switch 21, and the key operation, and supplies it to the CPU 24. A second operation key 22, a microphone signal mute switch 23 that prohibits transmission of an audio signal from the microphone 13, and a DTMF key lock means 25 having a function of prohibiting transmission of a DTMF signal are provided.
[0019]
Further, the CPU 24 performs a check operation by inputting the input signal from the first PTT switch 11 and the input signal from the second PTT switch 21 to each independent port. In this way, by inputting the input signals from the first or second PTT switch 11 or 21 to each independent port, the CPU 24 inputs from the first PTT switch 11 provided on the external microphone 1 side. The signal or the input signal from the second PTT switch 21 on the radio communication device main body 2 side can be reliably distinguished.
[0020]
Next, the operation of the embodiment shown in FIG. 1 will be described with reference to FIG. If, for example, the PTT switch 11 of the external microphone 1 is pressed with the DTMF key lock means 25 turned on, it is recognized that transmission is in progress (step S2). At this time, the first operation key 12 is recognized as being on the same external microphone 1 side (step S3), and the CPU 24 always checks whether or not there is a key input (step S5).
[0021]
When it is determined that the key of the first operation key 12 is being pressed, since it is a key operation during transmission, an operation as a DTMF signal transmission key is enabled (step S6). The microphone signal mute switch 23 prohibits the input of the audio signal to the transmission / reception circuit 26 (step S7), and sends out a DTMF signal of a code corresponding to the key operation of the first operation key 11 (step S8). Can do.
[0022]
At this time, even if the other second operation key 22 is pressed, the DTMF signal is not transmitted. That is, in this case, since the first PTT switch 11 on the external microphone 1 side is pressed, it is recognized that the second operation key 22 on the wireless communication device main body 2 side is different (step S3), and the ON state The DTMF key lock means 25 is prohibited from functioning as a DTMF key (step S4), and no DTMF signal is transmitted.
[0023]
Therefore, according to the above-described embodiment, for example, when the wireless communication device main body 2 is placed in a pocket or bag and the PTT switch 11 of the external microphone 1 is pressed to transmit the audio signal from the microphone 13, the wireless communication device Even if the second operation key 22 on the main body 2 side is accidentally pressed, the second operation key 22 is prohibited from sending a DTMF signal by the function of the key lock function of the DTMF key lock means 25. Therefore, transmission of the audio signal being transmitted can be continued as it is, and transmission of the DTMF signal due to erroneous key operation is not performed to the other party.
[0024]
Furthermore, the DTMF key lock means 25 of the above-described embodiment can be configured as follows. First, the electrical connection or disconnection of the external microphone 1 to the wireless communication device main body 2 is detected, and while the external microphone 1 is electrically connected to the wireless communication device main body 2, the DTMF key lock means 25. Is configured to be in an on state. As a result, the DTMF key lock means 25 can be turned on / off in conjunction with the connection / disconnection operation of the external microphone 1, and the trouble of changing the setting of the DTMF key lock function is eliminated each time. It is possible to improve the performance.
[0025]
【The invention's effect】
Since the present invention is configured as described above, when the wireless communication device main body is put in a pocket or a bag and a transmission operation is performed with an external microphone, the operation key means on the wireless communication device main body side is erroneously displayed. Even if the key is pressed, a DTMF signal due to an erroneous operation of the key is not transmitted, the telephone conversation on the external microphone side can be continued, and transmission of only the DTMF signal due to an erroneous operation can be prevented.
[0026]
In addition, since the DTMF signal key lock function is surely activated for an operation key that is prone to erroneous operation, it is not necessary to check the state of the DTMF signal key lock each time, and the PTT switch side during transmission operation The DTMF signal can be sent out simply by operating the operation keys. Furthermore, without changing the setting of the DTMF key lock function, a DTMF signal can be transmitted from the external microphone side or the radio communication device main body side, and operability can be improved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a wireless communication device of the present invention.
FIG. 2 is a flowchart showing the operation of FIG.
FIG. 3 is a block diagram showing a configuration of a conventional wireless communication device.
4 is a flowchart showing the operation of FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 External microphone 11 1st PTT switch 12 1st operation key 13 Microphone 2 Radio | wireless communication apparatus main body 21 2nd PTT switch 22 2nd operation key 23 Microphone signal mute switch 24 Microcomputer (CPU)
25 DTMF key lock means 26 Transmission / reception circuit 27 Display device 3 Antenna

Claims (2)

An external microphone including a microphone, a first PTT switch, and a first operation key that generates a control signal based on a key operation;
A second PTT switch; a second operation key for generating a control signal based on a key operation; and a DTMF signal generating means for transmitting a DTMF signal based on a key operation of the first or second operation key during transmission. A wireless communication device comprising: a microphone signal mute switch for prohibiting transmission of an audio signal from the microphone; and a wireless communication device body configured to electrically connect the external microphone, and a microcomputer for controlling the microphone signal mute switch In the machine
Transmission operation confirmation configured to detect the input signal from the first PTT switch on the external microphone side and the input signal from the second PTT switch on the main body side of the wireless communication device independently and distinguish them. Means,
DTMF key lock having a function of prohibiting transmission of a DTMF signal to the first or second operation key on the side different from the first or second PTT switch confirmed as being transmitted by the transmission operation confirmation means And a wireless communication device. 2. The wireless communication device according to claim 1, wherein the wireless communication device is configured to detect whether or not the external microphone is electrically connected to the wireless communication device main body and to turn on / off the DTMF key lock means.

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