JP2013192069A - Telephone set, telephone set control method, and telephone set test system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and remotely perform a test of a telephone set including a voice call function.SOLUTION: The telephone set comprises: a receiver which reproduces an inputted first voice signal as a voice; a transmitter which detects a voice, converts the voice to a second voice signal, and outputs the second voice signal; and a voice circuit which, when detecting call-incoming of a first control signal from a second line in a case where the receiver and the transmitter are not connected with a first line, connects the receiver and the transmitter with the second line, receives the first voice signal from the second line, transmits the first voice signal to the receiver, and transmits the second voice signal to the second line.

Description

  The present invention relates to a telephone, a control method thereof, and a telephone testing system.

  Several configurations have been proposed as a system for remotely testing a telephone function. Patent Document 1 describes the configuration of a line monitoring device in which a detection circuit for detecting an abnormality in a telephone line is connected to a voice line. The line monitoring device described in Patent Document 1 is such that a telephone line is disconnected at a predetermined time interval, a ground crossing (a state where the line is connected to the ground), a battery crossing (a power supply voltage is mixed into the line). State) and insulation failure.

  Patent Document 2 and Patent Document 3 monitor emergency telephones by transmitting a test PB (push button) signal to an emergency telephone and monitoring the emergency telephone by receiving a response of the PB signal from the emergency telephone. An apparatus is described.

Japanese Patent Laid-Open No. 4-172049 JP-A-10-126501 JP 2009-177541 A

Of the telephone components, the handset is relatively easy to break down. When testing the phone, including the handset function, conduct a voice call test under conditions that are close to the actual use of the phone. Is preferred. However, the configurations described in Patent Documents 1 to 3 cannot perform a voice call confirmation test of a telephone. The reason is that the monitoring device described in Patent Document 1 only detects line abnormality and cannot confirm the voice call function inside the telephone. Moreover, in the monitoring apparatus described in Patent Documents 2 and 3, the response of the monitoring target telephone is performed only by an electric circuit included in the telephone. For this reason, the monitoring devices described in Patent Documents 2 and 3 can only confirm the response operation of the audio circuit to the test PB signal from the monitoring device.
(Object of invention)
It is an object of the present invention to provide a technique for easily performing a telephone test including a voice call function from a remote location.

  The telephone of the present invention includes a handset that reproduces an input first sound signal as sound, a handset that detects sound and converts it into a second sound signal, and outputs the handset and handset. If the incoming call of the first control signal is detected from the second line when not connected to the first line, the receiver and transmitter are connected to the second line, and the first voice is sent from the second line. And an audio circuit for receiving the signal and transmitting the signal to the handset and transmitting the second audio signal to the second line.

  The telephone control method of the present invention reproduces the input first voice signal as voice by the receiver, converts the detected voice into the second voice signal by the transmitter, and outputs the second voice signal. When the incoming call of the first control signal is detected from the second line when is not connected to the first line, the receiver and the transmitter are connected to the second line and received from the second line. The first voice signal is sent to the handset, and the second voice signal is sent to the second line.

  The present invention has an effect of enabling a telephone test including a voice call function to be easily performed remotely.

It is a figure which shows the structure of the telephone testing system which is the 1st Embodiment of this invention. It is a figure which shows the operation | movement flow of the emergency telephone from transfer to test mode in 1st Embodiment to completion of a test. In 1st Embodiment, it is a figure which shows the operation | movement flow of an emergency telephone when the transmission by a user is performed during test execution. It is a figure which shows whether an emergency telephone takes an operation mode or a test mode for every state of a hook switch and the detection state of the ringing signal of a test line. It is a figure which shows the structure of the telephone set of the 2nd Embodiment of this invention.

  First, an outline of a telephone test system and a telephone set described in the following embodiments will be described. The test machine installed in the control room is connected to the telephone under test via an exchange network. When testing a telephone, the control room testing machine calls the telephone under test via a test network that is connected in advance to the exchange network and the telephone body under test, Connect the line to and from. Since the test machine and the telephone under test are connected via the exchange network, the test machine can connect a line to all the telephones under test connected to the exchange network.

  Further, the telephone under test has a function of placing the handset in a pseudo off-hook state when the handset is in an on-hook state, that is, when a call is received from the tester when the user is not using the device under test. When the telephone under test detects an incoming call from the testing machine, it connects the line with the testing machine and puts the handset of the telephone under test in a pseudo off-hook state. By setting the handset to a pseudo off-hook state, the circuit of the telephone under test is in the same state as when the user picks up the handset and enters the off-hook state. That is, in the pseudo off-hook state, the telephone under test is in a response state or a call state. In this case, the voice signal received from the tester can be reproduced at the mouthpiece of the handset, and the reproduced voice can be converted into a voice signal at the earpiece of the handset and transmitted to the tester. The audio signal received by the test machine is evaluated for the delay amount of audio signal transmission / reception and the audio quality.

  The state in which the telephone under test is not connected to the test machine is called an operation mode, and the state where the telephone under test is connected to the test machine is called a test mode. In the operation mode, a general user can use the telephone under test as a normal telephone.

  Further, the telephone under test may be provided with a function of switching from the test mode to the operation mode when the hook switch is in an off-hook state in the test mode. With this function, even when a line is connected between the test machine and the telephone under test, the general user can suspend the test by off-hooking the handset of the telephone under test, Users can make outgoing calls and make phone calls.

  With the configuration as described above, the telephone test system and telephone described in the following embodiments can confirm the normality of the entire telephone under test including the handset of the telephone under test and the voice circuit connected thereto. it can.

(First embodiment)
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing the configuration of a telephone test system 100 according to the first embodiment of the present invention. In the first embodiment, the telephone test system of the present invention is applied to an emergency telephone test system. The telephone test system 100 includes an emergency telephone 50, a center apparatus 10, an emergency telephone line 11a, a test line 11b, a switching line 11c, switching apparatuses 12 and 13, a testing machine 14, and a control room 15.

  In the present embodiment, the emergency telephones 50 are emergency telephones that are distributed on the highway. The emergency telephone 50 is connected to the center apparatus 10 via an emergency telephone line 11a which is a two-line telephone line generally called L1 and L2. When a trouble occurs on the highway, the user can call the center apparatus 10 using the emergency telephone 50 and can communicate with the person in charge operating the center apparatus in an emergency.

  The emergency telephone 50 is also connected to a test line 11b. Similar to the emergency telephone line 11a, the test line 11b is a telephone line composed of two lines L1 and L2. The test line 11b is connected to the test machine 14 via the exchange devices 12 and 13 and the exchange line 11c between the exchange devices. Here, the exchange devices 12 and 13 and the exchange line 11c between the exchange devices are general telephone exchange networks.

  The emergency telephone 50 includes a central processing unit (CPU) 1, a response control unit 2, a hook detection control unit 3, a conversion control unit 4, a handset 8 and a hook switch 5.

  The handset 8 is a handset used when a user uses the emergency telephone 50, and includes a earpiece 6 and a mouthpiece 7. The earpiece 6 is a speaker, for example, and the mouthpiece 7 is a microphone, for example. The voice signal received from the line (emergency line 11a or test line 11b) connected to the emergency telephone 50 is converted into voice at the earpiece 6 and radiated outside. The voice input to the mouthpiece 7 is converted into a voice signal at the mouthpiece 7 and transmitted to the line connected to the emergency telephone 50.

  The handset 8 is arranged so that the sound output from the earpiece 6 can be transmitted to the mouthpiece 7 through the external space. For example, the mouthpiece 7 and the mouthpiece 6 may be close to each other without being blocked, and may be supported by a hook portion to which the hook switch 5 is connected. The hook switch 5 enters an off-hook state when the user picks up the handset 8 to use the emergency telephone 50, and enters an on-hook state when the handset 8 is not used.

  The central processing unit 1 issues an operation instruction to the response control unit 2, the hook detection control unit 3, and the conversion control unit 4, and receives signals indicating the respective states from these control units. The central processing unit 1, the response control unit 2, the hook detection control unit 3, and the conversion control unit 4 may be configured as an audio circuit 60 on a single circuit board.

  The response control unit 2 monitors the incoming call signal from the test line 11b. The ringing signal is a ringing signal of 16 Hz, for example. When the response control unit 2 detects the ringing signal from the test line 11b, the response control unit 2 shorts L1 and L2 of the test line 11b.

  Further, the response control unit 2 has a function of detecting the arrival of a busy signal from the test line 11b. When the tester 14 restores the pseudo hook state of the emergency telephone 50 after the test is completed, the test machine 14 transmits a busy signal to the telephone under test via the test line 11b.

The hook detection control unit 3 is connected to the response control unit 2 through two lines (A1, B1), and connects an audio circuit between the response control unit 2 and the conversion control unit 4.
The state of the hook switch 5 indicating the hook state of the handset 8 is detected. The hook detection control unit 3 notifies the central processing unit 1 of the hook state (on-hook state and off-hook state) of the handset 8. The hook switch 5 is short-circuited when the handset 8 is raised to an off-hook state, and is released when the handset 8 is lowered to an on-hook state. The hook switch 5 is a single-pole single-throw switch that opens and closes in response to the weight of the handset 8, for example.

  When the hook detection control unit 3 receives an instruction from the central processing unit 1 to shift to the test mode, the hook detection control unit 3 enters a state similar to that when the hook switch 5 enters the off-hook state (hereinafter referred to as “pseudo off-hook state”). .

  The conversion control unit 4 performs 2-line-4 line conversion of the telephone line. That is, the conversion control unit 4 is connected to the hook detection control unit 3 by two lines, and is connected to the handset 8 by four lines. Since the circuit configuration and operation for performing 2-wire to 4-wire conversion of telephone lines are well known, detailed description thereof will be omitted.

  The conversion control unit 4 includes an amplifier that amplifies an audio signal output to the earpiece 6 in the test mode. When the emergency telephone 50 is tested, the amplifier amplifies the voice signal received from the testing machine, and sends a loud sound from the earpiece of the handset of the telephone under test. The tester may convert the sound source data held by the tester into an audio signal and send it out, or it may send out the voice sent by the operator of the control room 15 from the tester to the telephone under test. .

  Moreover, the conversion control part 4 may be provided with the function to change the termination resistance connected to the earpiece 6 at the time of test mode. Since the return level can be adjusted by changing the termination resistance, the reflection amount of the audio signal can be adjusted to a preferable value inside the emergency telephone 50. As the termination resistor, a variable resistor whose resistance value can be controlled by an external signal may be used. For example, the central processing unit 1 may control the value of the termination resistance according to the output of the amplifier.

  When the emergency telephone 50 is in the test mode, the state of the hook switch is a pseudo off-hook state. For this reason, even if the handset 8 is actually in an on-hook state, a part of the sound reproduced by the earpiece 6 is detected by the mouthpiece 7. The voice detected at the mouthpiece 7 is transmitted to the test line 11b as a voice signal transmitted from the emergency telephone. Here, when the emergency telephone 50 is housed and installed in the housing, the energy of the sound propagating from the earpiece 6 to the mouthpiece 7 is increased due to reflection inside the housing, so that the earpiece 6 is emitted. The voice can be detected by the mouthpiece 7 as a larger voice signal.

  For example, when the emergency telephone 50 is installed on a highway, the emergency telephone 50 is installed in a small casing covered with a steel plate. In such an environment, the emergency telephone 50 is in an environment where the sound emitted from the earpiece 6 is likely to be reflected inside the housing, and the voice can be efficiently propagated from the earpiece 6 to the mouthpiece 7.

  Note that the frequency of the audio signal sent from the testing machine 14 when the test is performed may be a relatively high frequency of about 3 kHz so that the noise around the emergency telephone 50 is not easily received. The testing machine 14 installed in the control room 15 may be a 4-wire testing machine capable of transmitting and receiving audio signals. The tester 14 transmits an audio signal from two lines on the transmission side of the tester 14 during the test.

(Description of operation)
FIG. 2 is a diagram showing an operation flow of the emergency telephone 50 from the transition to the test mode to the completion of the test in the first embodiment. The flow of FIG. 2 will be described with reference to FIG.

  The telephone test system 100 is in the operation mode except during the test. The operation mode is a mode in which a general user uses the emergency telephone 50. In the operation mode, the response control unit 2 has the lines L1 and L2 on the emergency telephone line 11a side connected to the hook detection control unit 3, and the lines L1 and L2 on the test line 11b side are connected to the hook detection control unit 3. Are open (S1 in FIG. 2). Further, the hook detection control unit 3 notifies the central processing unit 1 that the handset is in the on-hook state (S0).

  When the test machine 14 makes a dial call toward the test line 11b of the exchange device, a call signal is sent from the exchange device 13 to the emergency telephone 50. The ringing signal is a ringing signal of 16 Hz, for example. When the response control unit 2 detects the call signal (S2), the response control unit 2 notifies the central control unit 1 that the call signal has been detected (S3).

  When the central processing unit 1 receives a notification from the response control unit 2 that the test line 11b has detected the call signal when the hook switch 5 is in the on-hook state, the central processing unit 1 sets the state of the emergency telephone 50 to the test mode (S4).

  In addition, when the emergency telephone 50 is in an off-hook state, there is a high possibility that the emergency telephone 50 is being used by a general user. For this reason, when the emergency telephone 50 is in an off-hook state, the central processing unit 1 does not shift from the operation mode to the test mode even when a call signal is received from the test line 11b.

  When the emergency telephone 50 shifts to the test mode, the central processing unit 1 instructs the response control unit 2 to shift from the operation mode to the test mode when a certain time has elapsed after receiving the call signal. Specifically, the central processing unit 1 instructs the response control unit 2 to open the emergency telephone line 11a, short-circuit the two lines L1 and L2 of the test line 11b and connect them to the two lines A1 and B1. (S5). The response control unit 2 changes the line connection according to the instruction of the central processing unit 1 (S6). Since the test line 11b is short-circuited, the switching apparatus 13 can confirm that the test line 11b of the emergency telephone 50 has responded, so that the switching apparatus 13 stops sending the calling signal.

  The central processing unit 1 also instructs the hook detection control unit 3 and the conversion control unit 4 to shift to the test mode (S7, S8). When receiving an instruction from the central processing unit 1 to shift to the test mode, the hook detection control unit 3 enters a pseudo off-hook state (S9).

  When the conversion control unit 4 receives an instruction from the central processing unit 1 to shift to the test mode, the conversion control unit 4 activates the earpiece amplifier connected to the voice circuit connected to the earpiece 6 of the handset 8 ( S10). The amplifier amplifies the voice signal output to the earpiece 6 and increases the volume of the voice transmitted from the earpiece 6 to the outside.

  After the emergency telephone 50 shifts to the test mode, the testing machine 14 transmits a test audio signal. The test machine 14 sends a voice signal after being notified from the switching device 12 that the emergency telephone 50 has answered the call as a result of the test line 11b being short-circuited. This voice signal reaches the earpiece 6 of the handset of the emergency telephone 50 through the test line 11b. In this way, a voice call test including the handset 8 is performed between the test machine 14 and the emergency telephone 50 (S11).

  Here, in the emergency telephone 50, the time from the arrival of the ringing tone until the test line 11b is short-circuited may be slightly longer than the time required for the emergency telephone 50 to enter the test mode. By setting the time between the arrival of the ringing tone and the test line 11b being short-circuited in this way, the test by the testing machine is performed after the emergency telephone 50 is shifted to the test mode. For example, the time may be 5 seconds.

  The testing machine ends the test by evaluating the level, sound quality, delay, etc. of the audio signal received from the emergency telephone 50. The tester may transmit an audio signal of about 5 seconds or more during the test.

  After the test is completed, the line disconnection operation is performed in the test machine 14. The test machine 14 sends a busy signal to the emergency telephone 50 through the test line 11b. When the response control unit 2 detects the busy signal on the test line 11b, the response control unit 2 notifies the central processing unit 1 that the busy signal has been detected (S12, S13). When the central processing unit 1 receives notification from the response control unit 2 that a busy signal has been detected on the test line 11b, the central processing unit 1 sets the state of the emergency telephone 50 to the operation mode (S14). Then, the central processing unit 1 instructs the response control unit 2, the hook detection control unit 3, and the conversion control unit 4 to shift from the test mode to the operation mode (S15, S17, S19). Upon receiving the instruction to shift to the operation mode, the response control unit 2 opens the test line 11b and connects the two lines A1 and B1 to L1 and L2 of the emergency telephone line 11a (S16). When the hook detection control unit 3 receives an instruction to shift to the operation mode from the central processing unit 1, the hook detection control unit 3 releases the pseudo off-hook state of the hook switch 5 and shifts to the on-hook state which is the state before the test (S18). Furthermore, the conversion control part 4 may stop operation | movement of the amplifier for earpieces, if the transfer instruction | indication to operation mode is received from the central processing part 1 (S20). As a result, the emergency telephone 50 is changed from the test mode to the operation mode.

  FIG. 3 is a diagram showing an operation flow of the emergency telephone 50 when a call is made by the user during the execution of the test in the first embodiment. In FIG. 3, it is assumed that the emergency telephone 50 shifts to the test mode when a call signal is received on the test line 11b and the test is being performed (S21). In FIG. 3, the procedure up to the execution of the test (S21) is the same as the steps up to S11 in FIG. When the user raises the handset 8 of the emergency telephone 50, the hook detection control unit 3 detects that the hook switch 5 is in an off-hook state (S22). The hook detection control unit 3 notifies the central processing unit 1 that the hook switch 5 is in an off-hook state (S23).

  When the central processing unit 1 receives a notification from the hook detection control unit 3 that the hook switch 5 is in the off-hook state, the central processing unit 1 sets the state of the emergency telephone 50 to the operation mode (S24).

  When the response control unit 2 receives an instruction to shift to the operation mode from the central processing unit 1 (S25), the response control unit 2 opens the test line 11b and connects the emergency telephone line 11a to A1 and B1. When the emergency telephone line 11a is connected to A1 and B1, since the hook switch 5 is in the off-hook state, the response control unit 2 short-circuits L1 and L2 on the emergency telephone line 11a side and is connected through the emergency telephone line 11a. A normal telephone call operation is performed on the center device 10 that is present (S26).

  The central processing unit 1 also instructs the hook detection control unit 3 and the conversion control unit 4 to shift from the test mode to the operation mode (S27, S29). When receiving the instruction to shift to the operation mode, the hook detection control unit 3 cancels the pseudo off-hook state of the hook switch 5 (S30). In FIG. 3, since the user raises the handset 8, the hook switch 5 is in an off-hook state. Further, upon receiving the instruction to shift to the operation mode, the conversion control unit 4 may stop the operation of the earpiece amplifier (S28). With the above operation, even when the test is being performed, the user can talk with the center apparatus by picking up the handset 8 (S31).

  As described above, the telephone test system 100 according to the first embodiment shifts to the test mode in which the hook switch 5 of the emergency telephone 50 is set in a pseudo off-hook state during the test. In the test mode, even if the handset 8 is in the on-hook state, a speech path is formed between the tester 14 and the handset 8 of the emergency telephone 50. As a result, the tester 14 can receive the test voice signal sent to the emergency telephone 50 by turning it back on the handset 8. As a result, the test machine 14 can remotely confirm the normality of the call with the emergency telephone 50. That is, in the telephone test system 100 according to the first embodiment, even when the emergency telephones 50 are scattered and installed on the highway, each operator has to perform a functional test including the handset 8. There is no need to go to the location of the emergency telephone.

  Further, when the emergency telephone 50 detects the off-hook state of the hook switch 5 during the test, the emergency telephone 50 can be forcibly disconnected and the emergency telephone 50 can be connected to the emergency telephone line. As a result, the telephone test system 100 does not disturb the user's call by performing the test.

  Note that the tester may be configured such that the sound transmitted from the tester is prepared in advance, and the tester automatically makes a call to the plurality of emergency telephones 50 and performs the test at a predetermined time. . With such a configuration, the testing machine 14 can automatically connect to a large number of emergency telephones 50 sequentially and perform a test.

  FIG. 4 is a diagram showing whether the emergency telephone 50 is in the operation mode or the test mode for each hook state of the hook switch 5 and detection state of the ringing signal on the test line 11b. As shown in FIG. 4, when the off-hook switch 5 is not detected in the hook detection control unit 3, the response control unit 2 detects a call signal from the test line 11b and then receives a busy signal. During this period, the test mode is set. In this case, the hook switch 5 is in a pseudo off-hook state, and the voice signal transmitted from the testing machine 14 is returned by the handset 8 of the emergency telephone 50 and received by the testing machine 14.

  On the other hand, in the response control unit 2, the test line 11b is in a state other than the above, that is, the call test is not performed until the call signal is detected after the busy signal from the test line 11b is detected. Become. Therefore, during this period, the emergency telephone 50 is in the operation mode regardless of the state of the hook switch 5, and the user can talk to the center apparatus 10 using the emergency telephone 50. Further, as described with reference to FIG. 3, the hook switch 5 remains off-hook even in the test mode, that is, until the busy signal is received after the response control unit 2 detects the call signal from the test line 11b. When the state is reached, the emergency telephone 50 transitions to the operation mode. This corresponds to the case where the user picks up the handset 8 to use the emergency telephone 50. This transition allows the user to use an emergency call even during a call test.

  As described above, the telephone test system according to the first embodiment has an effect of enabling a telephone test including a voice call function to be easily performed remotely. That is, in the telephone test system of the first embodiment, the operation check up to the handset of the emergency telephone main body can be performed from the test machine in the control room, so the cost and time required for the operation check of the emergency telephone can be reduced. The

  The telephone test system 100 according to the first embodiment also has an effect of improving the reliability of the entire emergency telephone system by detecting a failure of the emergency telephone main body at an early stage. The reason for this is that early detection and early handling of a telephone failure can be achieved by automatically repeating the test without being restricted by time using a test machine in the control room.

  The telephone test system 100 according to the first embodiment also has an effect of not hindering a user's call during a test for obtaining the above effect. The reason is that when the user raises the handset while the emergency telephone is in the test mode, the emergency telephone detects the operation of the handset hook switch and shifts from the test mode to the operation mode. This is because an emergency call can be made by the user.

(Second Embodiment)
Subsequently, a second embodiment of the present invention will be described. FIG. 5 is a diagram illustrating a configuration of the telephone 200 according to the second embodiment of this invention. The telephone 200 includes a receiver 201, a transmitter 202, and an audio circuit 203. The receiver 201 reproduces the input first audio signal as audio. The transmitter 202 detects the voice reproduced by the receiver, and converts the detected voice into a second voice signal. The audio circuit 203 connects either the first line 204 or the second line 205 to the telephone 200.

  The telephone 200 is configured to be connectable to a second line 205 used for testing the telephone in addition to the first line 204 used for a normal call. When the telephone 200 is not used for a normal call, that is, when the handset 201 and the transmitter 202 are not connected to the first line 204, the telephone 200 is tested using the second line 205. be able to.

  When the telephone circuit 200 is not used for a normal call, when the voice circuit 200 detects the arrival of the first control signal from the second line 205 for testing, the voice line 201 and the transmitter 202 are connected to the second line. 205 is connected. The first control signal may be, for example, a 16 Hz ringing signal that is a call signal indicating an incoming call.

  On the other hand, when the telephone 200 is used for a normal call, even if the voice circuit 203 detects the arrival of the first control signal from the second line 205 for testing, the voice receiver 201 and the transmitter 202 and the second line 205 are not connected.

  When the telephone 200 is connected to the second line 205, the audio circuit 203 reproduces the first audio signal received from the second line 205 by the receiver 201. The first audio signal may be transmitted by a testing machine (not shown) used for testing the telephone 200.

  In addition, the audio circuit 203 transmits the second audio signal output from the transmitter 202 to the second line 205.

  With such a configuration, the telephone set 200 reproduces the first audio signal received from the second line 205 for testing by the receiver 201 of the telephone set 200, and the reproduced voice is transmitted by the transmitter 202 to the second line. Can be transmitted to the second line 205 as a voice signal. Therefore, the tester is connected to the second line, the tester confirms that the first audio signal sent from the tester returns as the second audio signal, and further evaluates the quality of the second audio signal. Thus, a function test including the handset 201 and the handset 202 of the telephone 200 can be performed.

  Further, the connection between the telephone 200 and the second line 205 is made only when the telephone 200 is not used for a normal call. Therefore, the telephone 200 according to the second embodiment can perform a function test from a remote location without impairing the convenience of general users.

  While the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

As an application example of the present invention, there is an emergency telephone system for a highway.

DESCRIPTION OF SYMBOLS 1 Central processing part 2 Response control part 3 Hook detection control part 4 Conversion control part 5 Hook switch 6 Earpiece 7 Mouthpiece 8 Handset 10 Center apparatus 11a Emergency telephone line 11b Test line 11c Switched line 12, 13 Switched apparatus 14 Test machine 15 Control room 50 Emergency telephone 60, 203 Voice circuit 100 Telephone test system 200 Telephone 201 Handset 202 Transmitter 204 First line 205 Second line

Claims (10)

A receiver for reproducing the input first audio signal as audio;
A transmitter that detects the voice, converts the voice into a second voice signal, and outputs the second voice signal;
When the reception of the first control signal from the second line is detected when the handset and the transmitter are not connected to the first line, the handset, the transmitter, and the second line are connected. An audio circuit connected to receive the first audio signal from the second line and send it to the handset and send the second audio signal to the second line;
Phone with. The audio circuit is
When a connection request to the first line occurs when the handset and the transmitter are connected to the second line, the line to which the handset and the handset are connected The telephone set according to claim 1, wherein the telephone line is switched from the second line to the first line. A switch that is in a first state when the handset and the handset are connected to the first line;
The audio circuit determines that a connection request to the first line has occurred when a state of the switch is changed from a state other than the first state to the first state. 2. The telephone set described in 2. The voice circuit detects the arrival of a second control signal from the second line when the handset and the transmitter are connected to the second line, and the handset and the transmitter are detected. The telephone set according to any one of claims 1 to 3, wherein the connection between the first line and the second line is cut off. The audio circuit is
A central processing means, a response control means, a hook detection control means, and a conversion control means,
The response control means detects the arrival of the first and second control signals and notifies the central processing means, and based on an instruction from the central processing means, the first and second lines and the hook Connected to the detection control means,
The hook control means notifies the state of the switch to the central processing means, controls the state of the switch based on an instruction from the central processing means, and includes the response control means and the conversion control means. connection,
The conversion control means amplifies the first audio signal input from the hook control means using an amplifier based on an instruction from the central processing means, outputs the amplified signal to the receiver, and inputs from the transmitter Outputting the second audio signal to the hook control means,
The telephone set according to any one of claims 1 to 4. The telephone set according to claim 5, wherein the amplitude of the signal output from the amplifier is controlled by the central processing means. The telephone set according to claim 1, wherein the first control signal is a signal indicating an incoming call. The telephone set according to claim 1, wherein the second control signal is a busy signal indicating that the connection destination is busy. A telephone set according to any one of claims 1 to 8;
A testing machine for sending a voice to a telephone for testing,
The telephone and the testing machine are connected by the second line;
Phone testing system. Play the input first voice signal as voice on the handset,
The detected voice is converted into a second voice signal by a transmitter and output,
When the reception of the first control signal from the second line is detected when the handset and the transmitter are not connected to the first line, the handset, the transmitter, and the second line are connected. connection,
Sending the first audio signal received from the second line to the handset;
Sending the second audio signal output from the transmitter to the second line;
Phone control method.

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