JP2002325139A - Time signal voice supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a time signal voice supply device that early detects deterio ration in a crystal oscillator and a fault in the device so as to take proper countermeasures. SOLUTION: The time signal voice supply device receives master time data from a master time device 24 calibrating time for a prescribed period and generates time data for time signal voice from the received time data and internal time data with precision equal to that of the time data from the master time device 24. The time signal voice supply device generates a time signal voice based on the time data for time signal voice and transmits the time signal voice to a switch of a telephone network. The time signal voice supply device detects an error between the time data from the master time device 24 and the internal time data and accumulates the absolute value of the detected errors. When the accumulated errors exceed a 1st prescribed value, the time signal voice supply device outputs an alarm externally. When the detected errors are very small, the time signal voice supply device calibrates no internal time data. When the detected errors are greater than a 2nd prescribed value, the time signal voice supply device raises an alarm externally.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time signal voice supply device for providing a service of reporting a time signal by voice through a telephone line in response to a user request.

[0002]

2. Description of the Related Art One of services provided by a telephone office is 1
There is a time signal voice supply service that gives a time signal in seconds by voice. For this service, a telephone sound supply system is established at the central office. Basically, this time signal voice supply system has a reference time device that generates accurate time data and a voice synthesizing unit that generates a time signal voice from accurate time information from the reference time device. Good.

[0003] However, the reference time device is very expensive and it is not cost-effective to provide this reference time device in every central office.

Therefore, the following system has been proposed as a practical time signal audio supply system. That is, for each exchange, for example, a master time device having a high-precision clock circuit using a crystal oscillator, and a time signal sound supply device that generates a time signal sound based on time data from the master time device. Provide. Then, a reference time device is connected to each master time device via, for example, a telephone network or a dedicated line, and the time data of the master time device is calibrated by reference time data from the reference time device. .

[0005] According to such a system configuration, the reference time devices are arranged in a required minimum number in each place, and the calibration based on the reference time data from the reference time device is performed, for example, through a telephone network or a dedicated line. By doing it once every few days,
Accurate time data can be obtained from the master time device. The master time device can be configured relatively inexpensively using a crystal oscillator, and has a practical system configuration.

[0006]

By the way, in the time signal voice service, it is important to provide accurate time information to the user stably. Therefore, in the case of a time signal sound supply system using a clock circuit using a crystal oscillator for some devices as described above, deterioration of the crystal oscillator and failure of the device are detected early so that appropriate measures can be taken. It is important to

In the case of the above system configuration,
It is also important to have a measure that can generate a time signal sound while minimizing the effects of crystal oscillator deterioration and device failure in the master time device.

It is an object of the present invention to provide a time signal sound supply device which can satisfy the above-mentioned requirements in a system using the master time device and the time signal sound supply device as described above. .

[0009]

In order to solve the above problems, according to the present invention, time data is received from a master time device in which time data is calibrated based on accurate reference time information. Internal time data of the same precision as the time data of the time device, if necessary, based on the received time data from the master time device, calibrated,
A time signal sound supply device that generates a time signal sound from the calibrated internal time data and sends the generated time signal sound to an exchange, wherein the time data from the master time device and the internal time data are Error detecting means for detecting the error of the error, error accumulating means for accumulating the absolute value of the error detected by the error detecting means, the value of the error accumulated by the error accumulating means, a predetermined predetermined value Means for issuing an alarm to the outside when the time exceeds, providing a time signal sound supply device.

In the invention according to claim 2, in the time signal sound supply apparatus according to claim 1, the internal time data is received by detecting that a calibration operation has been performed by the master time apparatus. It is characterized by comprising: means for calibrating according to time data; and accumulated error reset means for resetting the error accumulated by the error accumulating means when the internal time data is calibrated.

In the invention according to claim 3, time data is received from a master time device for performing time calibration based on accurate reference time information, and internal time data having the same accuracy as the time data of the master time device is received. Is calibrated as necessary based on the received time data from the master time device, generates a time signal voice from the calibrated internal time data, and sends the generated time signal voice to the exchange. An error detecting means for detecting an error between the time data from the master time device and the internal time data; and an error detected by the error detecting means, the error being detected by a first predetermined error. When the small error is less than or equal to the value of, the calibration of the internal time data is not performed,
Means for calibrating the internal time data in accordance with the received time data when it is detected that the master time device has performed a calibration operation.

Further, according to a third aspect of the present invention, in the third aspect, when the error detected by the error detecting means is larger than a second predetermined value larger than the first predetermined value. There is provided a time signal sound supply device characterized in that the time data from the time device is ignored, the time signal sound time data is generated from only the internal time data, and a means for issuing an alarm to the outside is provided.

[0013]

According to the first aspect of the present invention, the accumulated value of the absolute value of the error between the time data from the master time device and the internal time data detected by the error detecting means is calculated as the time data of the master time device. Since the internal time data of the time signal sound supply device has the same accuracy, the error (for example, deterioration of the crystal oscillator) generated in the time data generation unit of the master time device or the internal time data generation unit of the time signal sound supply device This indicates that the error (e.g., deterioration of the crystal oscillator) generated in step (1) has increased.

According to the first aspect of the present invention, when the cumulative value of the absolute value of the error exceeds a predetermined value, an alarm is issued to the outside. For example, it is possible to detect deterioration of the crystal oscillator caused by aging or the like, and to take appropriate measures such as replacement of the crystal oscillator.

According to the second aspect of the present invention, when the master time device is calibrated by the reference time device or the like, it is detected that the calibration operation has been performed, and the internal time data is converted. Calibrate. Then, when the internal time data is calibrated, the error accumulated by the error accumulating means is reset.

Therefore, according to the second aspect of the present invention, when the time data is corrected by the master time device,
Also in the time signal audio supply device, the internal time data can be calibrated, and the accumulated error is reset at the time of the calibration, so that the deterioration of the crystal oscillator caused by aging or the like can be correctly detected.

Further, in claim 3 having the above-described structure,
Since the time data of the master time device and the internal time data of the time signal sound supply device have the same accuracy, if the time data is within the range of the error of each time data,
The internal time data may be exactly synchronized with the time data from the master time device. At this time, if the time data from the master time device is calibrated to synchronize the internal time data of the time signal sound supply device, the time data may fluctuate.

However, in the invention of claim 3,
When the error detected by the error detection means is a small error equal to or less than a predetermined first predetermined value, the internal time data is not calibrated, and is used as it is as a basis of the time signal sound. Time signal data with little fluctuation can be transmitted.

Further, in the invention according to claim 4, when an error between the internal time data of the time signal sound supply device and the time data from the master time device becomes large, the supply of the time signal sound is immediately stopped. Instead of ignoring the time data from the master time device, the self-running unit for generating the internal time data of the time signal audio supply device generates the time signal audio time data only from the internal time data, and generates an alarm. To the outside. Therefore, it is possible to cope with a failure of the apparatus while supplying the time signal sound.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing an embodiment of a time signal sound supply apparatus according to the present invention, an overall outline of a time signal sound supply system will be described with reference to FIG.

A reference time device 21 for generating highly accurate reference time data is provided connected to a telephone network 22. In FIG. 2, although the number of reference time devices 21 is one,
In order to cover the whole of Japan, usually, a plurality is provided.

A master time unit 24 and a time signal audio supply unit 25 are provided for each of the exchanges 23 of each exchange.

The master time device 24 generates time data every second using a crystal oscillator having an oscillation frequency of, for example, 10 MHz. And the master time device 24
Supplies the generated time data to the exchange 23 as, for example, time data for billing, and supplies the time signal voice supply device 25 with time data used for generating the time signal voice (hereinafter, this time data is referred to as master time data). Data).

The master time device 24 is connected to the telephone network 22.
, And receives the reference time information from the reference time device 21 through this telephone network, and calibrates the time data. The reference time device 21 is, for example, once a day to seven days,
The reference time data for calibration is sequentially transmitted to each of the many master time devices 24 via the telephone network 22. When receiving the reference time data, the master time device 24 sets the calibration width to 1 millisecond / second and calibrates the time data every second.

That is, when there is an error between the reference time data and the master time data, the master time
The master time data transmitted every second is calibrated every millisecond, and calibration is performed so as to be synchronized with the reference time data.
Therefore, the master time data changes by one millisecond until it is synchronized with the reference time data.

The time signal audio supply device 25 has a built-in crystal oscillator having the same accuracy as the master time device 24, and uses the built-in crystal oscillator to generate time data every second (hereinafter, this time data is referred to as internal time data). create. Then, an error between the internal time data and the master time data from the master time device 24 is detected, the magnitude of the detected error is determined, and the detected time is synchronized with the master time data as necessary based on the determination result. Perform calibration. However, the error between the two is
When the error is a small error within the allowable range of the error of the crystal oscillator, the internal time data is not calibrated.

A time signal voice signal is generated by voice synthesis from the calibrated internal time data or uncalibrated internal time data, and is supplied to the exchange 23.

The time signal sound supply device 25 also detects the occurrence of an abnormality in the master time device 24 or the time signal sound supply device 25 at an early stage from an error between the internal time data and the master time data from the master time device 24. And a function of sending an alarm to the outside based on the detection result. In the example of FIG.
The alarm is sent to the monitoring center 26 through the telephone network 22.

Further, the time signal sound supply device 25 determines the accuracy of the crystal oscillator incorporated in the master time device 24 or the time signal sound supply device 25 based on the error between the internal time data and the master time data from the master time device 24. And a function for detecting deterioration of the accuracy of the crystal oscillator caused by aging or the like and, when it is determined that the crystal oscillator has deteriorated, alarming the outside to the outside. In the example of FIG. 2, the alarm is transmitted to the monitoring center 26 via the telephone network 22.

Further, the time signal sound supply device 25
The master time device has a function of detecting that calibration is being performed by the reference time data from the reference time device based on an error between the internal time data and the master time data from the master time device 24. When the time is in the middle, the time signal sound supply device 25 also performs a calibration operation to synchronize with the master time data.

When the switching device 23 receives the time signal voice request from the telephone terminal 27, the switching device 23 transmits the time signal voice from the time signal voice supply device 25 to the requesting telephone terminal.

Next, as an embodiment of a time signal sound supply device according to the present invention, a time signal sound supply device 25 having the above functions will be described with reference to FIGS. FIG. 1 is a block diagram illustrating a configuration example of the time signal sound supply device 25. FIG. 3 is a flowchart for explaining the operation of the time signal sound supply device 25.

As shown in FIG. 1, the time input unit 1 receives master time information from the master time device 24 and sends it to the error detection unit 2. On the other hand, the time signal sound supply device 25 has a crystal oscillator 8 having the same accuracy as the crystal oscillator of the master time device 24.
The internal time creation unit 9 creates internal time data every second based on the oscillation output from the crystal oscillator 8, and sends the created internal time data to the error detection unit 2. .

The error detecting section 2 compares the master time data received from the time input section 1 with the internal time data from the internal time creating section 9 to detect an error ΔT. Then, the error detecting section 2 sends the detected error ΔT to the small error determining section 3 and the memory section 6.

The memory unit 6 has a function of accumulating and accumulating the absolute value of the error ΔT received from the error detection unit 2.

The small error judging section 3 judges whether the error ΔT is a small error equal to or smaller than a threshold θa obtained by adding an error to a time considering the accuracy of the crystal oscillator of the master time clock device 24 and the time signal sound supply device 25. I do. In this embodiment, θ
a = 100 microseconds.

The small error determination unit 3 determines that the error ΔT is equal to the threshold θa
When it is determined that the error is within the small error range smaller than the above, an instruction is issued to the time calibration unit 10 without internal time data calibration. The time calibration unit 10 receiving this instruction sends an instruction not to perform time calibration to the internal time creation unit 9 and sends the internal time data from the internal time creation unit 9 to the speech synthesis unit 11. The voice synthesizer 11 generates a time signal voice based on the input time data and sends it to the exchange 23.

As described above, in this embodiment, the crystal oscillator of the master time device 24 and the crystal oscillator 8 of the time signal sound supply device 25 have the same accuracy.
If both crystal oscillators are operating normally and the error is not large due to aging or the like, the error between the master time data and the internal time data always falls within a small error range equal to or less than the threshold value θa.

Therefore, at this time, if the calibration for synchronizing the internal time data with the master time data is performed, the operation becomes such that the internal time data follows the error included in the master time data, and the time data for the time signal fluctuates. become. On the other hand, when the error ΔT is equal to or smaller than the threshold value θa as in this embodiment, the calibration for synchronizing the internal time data with the master time data is not performed. Therefore, a time signal sound with little fluctuation is transmitted.

When it is determined that the error ΔT is larger than the threshold value θa, the minute error determination section 3
Do not give an instruction for zero internal time data calibration for 0,
The information on the error ΔT is sent to the master time data calibration determination unit 4.

As described above, the master time device 24
According to the reference time data from the reference time device 21,
The time is calibrated once every seven days. The master time data calibration determination unit 4 determines whether the received master time data is performing a calibration operation based on the reference time data from the reference time device 21 in the master time device 24.

As described above, the calibration operation of the master time device 24 is performed for each output master time data, that is,
Since the operation is sequentially performed in units of 1 millisecond every second, the master time data calibration determination unit 4 determines that the error ΔT is in the range of, for example, 900 microseconds to 1.1 milliseconds in consideration of the included error ( Whether or not the calibration is performed is determined based on whether or not the value is 900 microseconds ≦ ΔT ≦ 1.1 milliseconds.

The determination as to whether or not the calibration operation is being performed by the master time device 24 may be made based on whether or not only the error ΔT at one second is within the above range. In general, the calibration operation is performed when the error detection unit 2 detects that the error ΔT for each second is continuously within the range over a plurality of seconds in consideration of the operation over a plurality of seconds.
It may be determined that the calibration operation is being performed.

Then, the master time data calibration determination section 4
When the master time device 24 determines that the calibration operation is being performed, the master time device 24 instructs the time calibration unit 10 to calibrate the internal time data in synchronization with the calibration of the master time data, An instruction to clear the accumulated error is issued to the memory unit 6.

The instruction to calibrate the internal time data synchronized with the calibration of the master time data, which is issued from the master time data calibration determining section 4 to the time calibrating section 10, is one millisecond for each time data of one second. Since the instruction is a calibration instruction, the time calibration unit 10 issues the 1 ms calibration instruction to the internal time creation unit 9. The internal time creation unit 9 receives this, and stores the internal time data by the timing of the next one second.
Calibrate for the specified 1 millisecond.

During this internal time data calibration operation, the time calibration unit 10 also sends the internal time data from the internal time creation unit 9 to the speech synthesis unit 11, and the speech synthesis unit 11
A time signal voice is generated based on the internal time data and transmitted to the exchange 23.

When the above-described calibration operation is performed, the master time data from the master time device 24 and the internal time data of the time signal sound supply device 25 are completely synchronized. Therefore, the master time data calibration determination unit 4 issues an instruction to clear the accumulated error to the memory unit 6 during the execution of the calibration operation. Upon receiving the clear instruction, the memory unit 6 receives the error ΔT
Resets the cumulative value of the absolute value of to zero.

When the master time data calibration determination unit 4 determines that calibration is not being performed by the master time device 24 based on the information of the error ΔT received through the small error determination unit 3,
The data of the error ΔT is sent to the device failure determination unit 5 without issuing an instruction to calibrate the internal time data described above to the time calibration unit 10.

In the device failure determination section 5, the received error Δ
It is determined whether or not the value of T is large enough to consider that one or both of the master time device 24 and the time signal sound supply device 25 has failed.
In this example, the device failure determination unit 5 determines whether the error ΔT is greater than a predetermined threshold θb. Threshold value θb
Is, for example, θb = 1.1 milliseconds.

When the device failure determination unit 5 determines that the error ΔT is equal to or smaller than the threshold value θb, the time calibration unit 1
At 0, a calibration instruction for synchronizing with the master time data is issued. Time calibration unit 10 receiving this calibration instruction
Sends a calibration instruction to the internal time creation unit 9 to synchronize the internal time data with the master time data. Upon receiving the calibration instruction, the internal time creation unit 9 performs a process of calibrating the internal time data so as to eliminate an error ΔT from the master time data by the next one second timing.

The time calibration unit 10 also sends the internal time data from the internal time creation unit 9 to the voice synthesizing unit 11 at this time, so that the voice synthesizing unit 11 generates a time signal voice based on the received internal time data. Generate it and send it to the exchange.

The device failure judging section 5 determines that the error ΔT is
When it is determined that the value is larger than the threshold value θb, one of the master time device 24 and the time signal sound supply device 25,
Alternatively, it is determined that a failure has occurred in both, and the time calibration unit 10
Is notified to the alarm sending section 7.

Upon receipt of the abnormality notification, the time calibration unit 10 ignores the subsequent master time data from the master time device 24, and the internal time creation unit 9 instructs the self-running only by the data from the crystal oscillator 8. I do. Further, upon receiving the abnormality notification, the alarm sending unit 7 sends an abnormality notification indicating that one or both of the master time device 24 and the time signal audio supply device 25 have failed to the monitoring center 26. To send to. Although not shown, the time signal sound supply device 25 itself is also provided with a buzzer and an alarm lamp, and the occurrence of abnormality is also alarmed by them.

Incidentally, the accuracy of the crystal oscillator generally deteriorates due to aging. In this embodiment, the change in the accuracy of the crystal oscillator of the master time device 24 and the accuracy of the crystal oscillator 8 of the time signal sound supply device 25 are determined by the accumulated value (error) of the absolute value of the error ΔT between the master time data and the internal time data. This error accumulated value is stored in the memory unit 6.

In this embodiment, the memory unit 6
When the cumulative value of the error becomes a large value exceeding a predetermined threshold value θc, the crystal oscillator of the master time device 24 or the crystal oscillator 8 of the time signal sound supply device 25
Has been provided with a function of detecting that the has deteriorated and transmitting the fact to the monitoring center 26 through the alarm transmitting unit 7. In this embodiment, the threshold value θc is, for example, 250 milliseconds.

When the crystal oscillator of the master time device 24 and the crystal oscillator 8 of the time signal sound supply device 25 are not deteriorated, the internal time data is calibrated so as to follow the master time data as described above. When the time data is calibrated, the internal time data is calibrated in synchronization with the master time data, and the accumulated error value in the memory unit 6 is cleared and reset to zero.
c is not expected to be exceeded.

However, if the accuracy of the crystal oscillator deteriorates,
Even if the internal time data is calibrated in accordance with the master time data, the absolute value of the error for the time data every second increases, so the error accumulation in the memory unit 6 is not corrected before the master time data is calibrated. Before the value is reset to zero, the threshold θc is exceeded.

When the memory unit 6 detects that the accumulated error value exceeds the threshold value θc, the memory unit 6 informs the alarm sending unit 7 of the crystal oscillator of the master time unit 24 or the time signal sound supply unit 25.
Is instructed to send an alarm that the crystal oscillator 8 has deteriorated. Upon receiving this instruction, the alarm sending section 7 sends an alarm to that effect to the monitoring center 26.

In an abnormal state where an alarm is transmitted from the alarm transmitting section 7 or in a state where the crystal oscillator is deteriorated,
The time signal voice is not sent to the exchange 23. Then, in response to this alarm, the malfunction of the master time device 24 and the time signal sound supply device 25 is repaired, and when the crystal oscillator is replaced with a new one, the time signal sound supply device 2
No. 5 sends a time signal voice to the exchange 23.

The flow of the time calibration or calibration operation and the abnormality detection operation in the time signal sound supply device 25 described above is shown in the flowchart of FIG. The flowchart of FIG. 3 corresponds to a processing operation when the time signal sound supply device 25 is realized using a microcomputer.

That is, when master time data is received from the master time device (step S101), an error ΔT between the internal time data and the received master time data is detected (step S102). Then, the absolute value of the error ΔT is stored in the memory unit 6 (step S103).
Next, the accumulated error accumulated in the memory unit 6 is equal to the threshold θc
It is determined whether it is larger than (Step S104).

If it is determined in step S104 that the accumulated error stored in the memory section 6 is larger than the threshold value θc, an alarm is sent to the outside such as the monitoring center 26, and the crystal oscillator or the time signal It notifies that the crystal oscillator 8 of the supply device 25 has deteriorated (step S105), and waits for a process such as replacement of the crystal oscillator.

If it is determined in step S104 that the accumulated error stored in the memory unit 6 is smaller than the threshold value θc, it is determined whether the error ΔT is a small error smaller than the threshold value θa (step S106). . If it is determined that the error is a small error, the process returns to step S101 without performing time calibration (step S107), and waits for the next master time data.

When it is determined in step S106 that the error ΔT is larger than the threshold value θa, the master time device 24 determines whether calibration is being performed based on the reference time data (step S108).

When it is determined that the time is being calibrated by the master time device 24, a calibration operation is performed to match the internal time data with the master time data in units of 1 millisecond as described above (step S109). Then, the accumulated error in the memory unit 6 is cleared and the accumulated error value is reset to zero (step S110). Then, step S10
The process returns to 1 and waits for the next master time data.

In step S108, the master time device 24
Then, when it is determined that the time is not being calibrated, the error ΔT
Is larger than the threshold value θb (step S1).
11). When it is determined that the error ΔT is equal to or smaller than the threshold value θb, the internal time data is calibrated so as to match the master time data (step S112). Then, the process returns to step S101 to wait for the next master time data.

When it is determined in step S111 that the error ΔT is larger than the threshold value θb, the master time data is ignored, and the internal time data is self-propelled so as to be generated based only on its own crystal oscillator. (Step S113), the abnormality is reported to the outside such as the monitoring center (Step S114).

As described above, in this embodiment, it is possible to determine the failure of the master time device or the time signal sound supply device while determining the deterioration of the crystal oscillator. Further, it is possible to detect a failure of the master time device or the time signal sound supply device while transmitting an accurate time signal sound.

The time signal audio supply device does not always adjust the internal time data to the master time data from the master time device. When the error between the master time data and the internal time data is very small, Does not adjust the time, it is possible to suppress the fluctuation of the time signal voice, which is the final output.

[0070]

As described above, according to the present invention, a failure of the master time device or the time signal voice supply device is detected and an alarm is issued while transmitting accurate time signal voices. It can be detected early and appropriate measures can be taken. In addition, since the deterioration of the crystal oscillator of the master time device or the time signal sound supply device is detected instead of the failure and an alarm is issued, appropriate measures such as replacement of the crystal oscillator can be performed.

Further, it is possible to transmit a time signal sound with little fluctuation.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a time signal sound supply device according to the present invention.

FIG. 2 is a diagram for explaining an overall outline of a time signal sound supply system to which a time signal sound supply device according to the present invention is applied.

FIG. 3 is a flowchart for explaining the operation of the embodiment of the time signal sound supply device according to the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Time input part 2 Error detection part 3 Small error judgment part 4 Master time data calibration judgment part 5 Device failure judgment part 6 Memory part 7 Alarm sending part 8 Crystal oscillator 9 Internal time creation part 10 Time correction part 11 Voice synthesis part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasushi Furuya 6-10-13 Nakanobu, Shinagawa-ku, Tokyo Inside Daiko Electric Manufacturing Co., Ltd. (72) Inventor Koichi Kamiya 2-3-1 Otemachi, Chiyoda-ku, Tokyo No. Within Nippon Telegraph and Telephone Corporation (72) Takayoshi Nakatani 2-3-1 Otemachi, Chiyoda-ku Tokyo F-term (reference) 2-12, Fujitsu Eye Network Systems Limited 2F002 AA04 AF00 CB00 CB16 FA16 GA06 5K015 AD01 GA01 GA04 5K024 AA71 AA76 AA79

Claims (4)

[Claims] 1. Time data is received from a master time device in which time data is calibrated based on accurate reference time information, and internal time data having the same accuracy as the time data of the master time device is received. A time signal audio supply device that calibrates as necessary based on time data from the device, generates a time signal audio from the calibrated internal time data, and sends the generated time signal audio to an exchange. Error detection means for detecting an error between the time data from the master time device and the internal time data; error accumulation means for accumulating an absolute value of the error detected by the error detection means; Means for issuing an alarm to the outside when the value of the error exceeds a predetermined value. 2. The time signal audio supply device according to claim 1, wherein the master time device detects that a calibration operation has been performed, and calibrates the internal time data in accordance with the received time data. And a cumulative error resetting means for resetting the error accumulated by the error accumulating means when the internal time data is calibrated. 3. Receiving time data from a master time device in which time data is calibrated based on accurate reference time information, and storing the internal time data having the same accuracy as the time data of the master time device as the received master time device. A time signal sound supply device that calibrates as necessary based on time data from the device, generates a time signal sound from the calibrated internal time data, and sends the generated time signal sound to an exchange. An error detection unit that detects an error between the time data from the master time device and the internal time data; and an error detected by the error detection unit is a small error that is equal to or less than a predetermined first predetermined value. In some cases, the internal time data is not calibrated, and when it is detected that the master time device has performed a calibration operation, the internal time data is received. Means for calibrating in accordance with the time data, time signal sound supply apparatus comprising: a. 4. The time signal sound supply device according to claim 3, wherein when the error detected by the error detecting means is larger than a second predetermined value larger than the first predetermined value,
A time signal sound supply device comprising: means for generating the time signal sound time data only from the internal time data, ignoring time data from the master time device, and providing means for issuing an alarm to the outside.