JPH1127410A - Automatic time adjustment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize a time delay in time adjustment and to enable precise time adjustment by transmitting a time adjustment pulse to a signal extract clock part of a frequency of a time signal sound. SOLUTION: A band-pass filter/level conversion part 12 includes a filter for letting a signal of an announcement sound frequency and a signal of a time signal sound frequency pass and a level conversion part for converting an AC signal of an output of this filter to a rectangular wave signal. Also an announcement sound identification part 13 adds an enable signal to a time adjustment pulse generation part 14 when it identifies the announcement sound and it continues for a fixed times. Then, the time adjustment pulse generation part 14 outputs a time adjustment pulse by a rise timing of the rectangular wave signal for indicating the time signal sound from the band-pass filter/level conversion part 12 and inputs it to a clock part 2 by way of an interface part 15 when this enable signal is being inputted. The clock part 2 adjusts the time in accordance with this time adjustment pulse.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic time adjustment device for automatically adjusting the time of a clock using a time signal service. The private branch exchange has a clock function,
The public network also provides a time signal service.
Therefore, the time of the clock function can be adjusted using this time signal service.

[0002]

2. Description of the Related Art A time signal service is provided by television, radio, telephone, and the like. Electronic exchange systems such as private branch exchanges are required to have higher speed and higher accuracy with diversification of information, and higher accuracy is also required for an internal clock function.

[0003] Therefore, various systems for automatically adjusting the time of the clock function using a time signal service have already been proposed. For example, in the conventional example shown in FIG. 8, a signal is automatically called to a time signal service unit, a signal of a frequency of a notice sound and a signal of a time signal received from the time signal service unit via a telephone line are extracted, and a signal of a predetermined level , A recognition unit 82 for recognizing a warning sound and a time signal according to an output signal of the filter / level conversion unit 81, and a time signal after the notification sound recognition signal from the recognition unit 82. A time adjustment pulse generation unit 83 that applies a time adjustment pulse to the clock unit 84 based on the recognition signal.

When a signal from, for example, a time signal service unit shown in FIG. 9A is input to a filter / level conversion unit 81 via a telephone line, a filter for passing a signal having a frequency of a notice sound and a time signal sound is used. By level-converting the output signal, a signal shown in (b) is output, and when this signal continues for a predetermined time, the recognition circuit 82 outputs a detection signal of a warning sound or a time signal as shown in (c). I do. The time adjustment pulse generation unit 83 confirms the detection signal when the detection signal of the time signal is input after the detection signal of the announcement sound has been output three times in succession, and sends the time adjustment pulse shown in (d) to the clock unit. Send out. The clock adjusts the time at the timing of the time signal based on the time adjustment pulse.

Similarly, an automatic call is made to the time signal service section,
A watch that receives and identifies the advance notification sound and the time signal from the time signal service unit, generates a gate signal of a predetermined time width in advance, and adjusts the time of the clock unit when the time signal is detected within the period of the gate signal. An apparatus is known (for example, see
-199101).

[0006] Further, after detecting the 500 Hz notice sound by the time signal service three times in succession and detecting the 1000 Hz time signal, the second S of the clock at that time is read and a predetermined value corresponding to the value of the second S at that time is read. In addition, one of the time required for the determination process
There is known a configuration in which a value obtained by adding seconds is set in a register, and when a detection signal of a time signal has continued for a predetermined time, the value set in the register is written to a watch as the current second (for example, see Japanese Patent Application Laid-Open Publication No. H11-163873). See JP-A-63-234190).

[0007]

In each of the above-mentioned prior arts, a time adjustment sound is generated and a time adjustment pulse is generated and time update control is performed by detecting the frequency and duration of the time signal. is there. In this case, in order to prevent a malfunction due to noise or the like, for example, a 1 kHz time signal is extracted by a filter, and when a predetermined level is continued for a predetermined time, the time signal is recognized as a time signal.
This requires a time of msec. For example, as shown in (d) of FIG. 9, from the time signal sound input at time t1 to time t2 when the time adjustment pulse is output,
In general, it is several tens msec.

[0008] However, since the warning sound and the time signal sound indicate the exact time of the rise, the time signal sound is received and detected, and the time adjustment pulse is input to the clock section to adjust the time. A delay time of several tens of msec occurs before the operation is performed, and there is a problem that the accuracy cannot be said to be sufficient. An object of the present invention is to perform accurate time adjustment while minimizing a time delay of time adjustment.

[0009]

The automatic time adjustment apparatus according to the present invention comprises: (1) an automatic calling unit 11 for automatically calling the time signal service unit 3 in response to a time adjustment request signal from the clock unit 2, and a time signal service unit. 3. A band-pass filter / level converter 12 for extracting the signal of the frequency of the announcement sound and the time signal from 3; and the signal of the frequency of the announcement sound extracted by the band-pass filter / level converter 12 has continued for a predetermined time. And an advance notice sound recognition / identification unit 13 which recognizes the notice signal as an advance notice signal and outputs an enable signal, and the band-pass filter / switch when the enable signal from the advance notice sound recognition / identification unit 13 is input.
A time adjusting pulse generating unit for transmitting a time adjusting pulse to the clock unit 2 by extracting a signal of the frequency of the time signal from the level conversion unit 12; To minimize the time delay of time adjustment.

[0010] (2) The band-pass filter / level converter 12 converts an output signal of the advance sound filter to a rectangular wave signal by comparing the output signal of the advance sound filter with a reference level. Notice sound level conversion unit
A time signal filter that passes a signal of the frequency of the time signal;
A time signal level conversion unit for comparing the output signal of the time signal filter with a reference level to convert the signal into a square wave signal; and a notice sound recognition / identification unit 13 which outputs a square wave signal output from the notice sound level conversion unit. A notice sound recognition unit that recognizes the notice sound as a notice sound when it is continuous at a predetermined period and outputs a pulse signal, and identifies that the notice signal has been received a predetermined number of times by counting the pulse signal from the notice sound recognition unit. A notice sound counter that outputs an enable signal, and the time adjustment pulse generation unit 14
The time adjustment pulse is sent to the clock unit in response to the rise of the output signal of the hourly sound level conversion unit when the enable signal from the notice sound counter is input.

(3) When the time of a clock unit controlled by a central control unit of an exchange such as a private branch exchange is adjusted, an automatic call for receiving a time adjustment request signal from the central control unit and automatically calling the time signal service unit. A call unit, a band-pass filter / level conversion unit for extracting a signal of the advance notice sound and the frequency of the time signal sound from the time signal service unit, and a signal of the frequency of the notice sound extracted by the band-pass filter / level conversion unit is a predetermined signal A warning sound recognition / identification unit that recognizes the signal as a warning sound signal and outputs an enable signal due to the continuation of time, and a time signal from the bandpass filter / level conversion unit when the enable signal from the warning sound recognition / identification unit is input. A time adjustment pulse generation unit that sends a time adjustment pulse for adjusting the time of the clock unit to the central control unit by extracting the signal of the sound frequency. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram of an embodiment of the present invention. 1 is an automatic time adjustment device, 2 is a clock unit, 3 is a time signal service unit, 4 is a public network, and 11 is an automatic call. , 12 is a band-pass filter / level converter, 13 is a notice sound recognition / identification unit, 14 is a time adjustment pulse generator, and 15 and 16 are interface units.

The time signal service unit 3 is connected to the exchange of the public network 4 as already known, and is controlled by a second signal from a standard frequency station (JJY) to provide an accurate time signal. I have. The automatic calling unit 11 has a function of dialing, for example, the number “117” to the time signal service unit 3 by a time adjustment request signal from the clock unit 2 via the interface unit 15. As the configuration of the automatic calling section 11, various known automatic calling configurations can be applied.

By the automatic calling from the automatic calling unit 11, the time signal service unit 3 and the automatic time adjustment device 1 are connected via a telephone line. The signal is input to the band-pass filter / level converter 12 via the unit 16. Further, after the time is adjusted, the automatic calling unit 11 disconnects the line according to the end notification from the clock unit 2 via the interface unit 15.

The band-pass filter / level converter 12
Includes a filter that passes a signal of the frequency of the notice sound and a signal of the frequency of the time signal, and a level conversion unit that converts an AC signal output from the filter into a rectangular wave signal. The enable signal is added to the time adjustment pulse generator 14 when the notice sound is recognized and the predetermined number of times has passed. When the enable signal is input, the time adjustment pulse generator 14 outputs a time adjustment pulse at the rising timing of the rectangular wave signal indicating the time signal from the bandpass filter / level converter 12 when the enable signal is input.
5 to the clock unit 2. The clock unit 2 adjusts the time according to the time adjustment pulse.

FIG. 2 is an explanatory view of a main part of an automatic time adjustment apparatus according to an embodiment of the present invention. The same reference numerals as those in FIG. 1 denote the same parts, 21 is a notice sound filter, 22 is a notice sound level converter, 23 hourly sound filter, 24 hourly sound level conversion unit, 25 announcement sound recognition unit, 26 is a warning sound counter, V _CC, V _EE power supply voltage, V _r denotes the threshold voltage.

The notice sound filter 21 is, for example, 500H
The filter is a filter that passes a signal of the frequency of the notice sound of z, and the time signal filter 23 is a filter that passes a signal of the frequency of the time signal of 1 kHz, for example. The notice sound level converter 22 and the time signal sound level converter 24 compare the threshold voltage _Vr with the input signal, and convert the signal of the notice sound frequency or the signal of the time signal sound into a square wave signal. Things.

FIG. 3 is a time chart of the embodiment of the present invention, in which (a) to (g) show an example of signals a to g of each section in FIG. 2, and (a) shows reception from the time signal service section. A signal a of the frequency of the notice sound to which the signal is input is shown, and (b) shows a signal b of the frequency of the time signal. Notice sound level converter 22
Compares the output signal a of the preview sound filter 21 with the threshold voltage _Vr, and outputs a square wave signal c having the frequency of the preview sound shown in FIG.
Is output. The time signal sound level conversion unit 24 compares the output signal b of the time signal filter 23 with the threshold voltage _Vr ,
A rectangular wave signal d having the frequency of the time signal shown in (d) is output.

The notice sound recognition section 2 of the notice sound recognition / identification section 13
Numeral 5 is a signal for recognizing that the notice sound has been received when it is recognized that the input rectangular wave signal c has continued for a predetermined time at a predetermined level. When the count value is reached, or when the retrigger multivibrator is triggered by the rectangular wave signal c and a pulse signal of a predetermined time width or more is obtained, it can be recognized that the preview sound has been received. The pulse signal e shown in FIG. The notice sound counter 26 counts the pulse signal e from the notice sound recognition unit 25, outputs an enable signal f shown in (f) as a notice sound reception confirmation by three counts, and inputs the enable signal f to the time adjustment pulse generation unit 14. .

When the enable signal f is input, the time adjustment pulse generator 14 receives the rectangular wave signal d from the time signal level converter 24 of the band-pass filter / level converter 12 to generate the signal (g). The time adjustment pulse g shown is sent to the clock unit. When the time adjustment pulse g is output, the above-mentioned notice sound counter 26 is reset. Therefore, the time adjustment pulse g can be output at the timing of the rise of the time signal after the detection sound is detected, so that the time delay of the time adjustment in the clock unit 2 can be minimized.

FIG. 4 is an explanatory view of an embodiment of the present invention applied to an exchange. 1 is an automatic time adjustment device, 3 is a time signal service unit, 4 is a public network, 30 is an exchange such as a private branch exchange,
31 is a communication network (NW), 32 is a central control unit (CPU), and 33 is a clock unit.

The clock unit 33 shows a case where the clock unit 33 is built in the central control unit 32 of the exchange 30. The central control unit 32 periodically adjusts the time of the clock unit 33.
Shows a control flow at the time of time adjustment. That is, when the central control device 32 issues a time adjustment request to the automatic time adjustment device 1 via the communication path network 31 or a control line (not shown), the automatic time adjustment device 1 For example, “1” for calling the service unit 3
No. 17 is automatically dialed. The central control device 32
By analyzing this dial number and controlling the communication network 31, a path connecting the time signal service unit 3 and the automatic time adjustment device 1 is set.

As a result, a time signal service signal including a preliminary sound and a time signal is transmitted from the time signal service section 3 to the automatic time adjustment device 1. As described above, the time automatic adjustment device 1 receives and identifies the advance notification sound, and recognizes that the next time is a time signal by a predetermined number of times, for example, three consecutive receptions, so that the time signal rises. A time adjustment pulse is applied to the central control unit 32 at the timing.

The central control unit 32 adjusts the time of the clock unit 33 by the time adjustment pulse, and sends a release request to the automatic time adjustment device 1. Thereby, the automatic time adjustment device 1 issues a line disconnection request, and the central control device 32 releases the path of the communication path network 31.

FIG. 5 is a time chart at the time of time adjustment according to the embodiment of the present invention. FIG. 5A shows a start signal indicating a time adjustment request from the central control device 32 to the time automatic adjustment device 1, and FIG. Indicates a dial signal of, for example, the number "117" for making a call from the automatic time adjustment device 1 to the time signal service unit 3 according to the activation signal. (C) shows a time signal service signal transmitted from the time signal service unit 3. That is, for example, 5 which can be heard as pu, pu, pu, peen
The automatic time adjustment device 1 receives the notice sound of 00 Hz and the time signal of 1000 Hz.

(D) shows the time output at the rising timing of the automatic time adjustment device 1 by receiving a time signal from the time signal service unit 3 after receiving and identifying a predetermined number of advance sounds. 3 shows an adjustment pulse. (E)
When the time adjustment under the control of the central control device 32 is completed, the start signal shown in FIG. 7A falls, so that the automatic time control device 1 determines that the release request has been made and sends it to the central control device 32. Indicates a line disconnection request.

FIG. 6 is a sequence chart for time adjustment according to the embodiment of the present invention.
Sends a time adjustment request to the automatic time adjustment device 1 from
The automatic time adjustment device 1 automatically calls the time signal service unit 3. It receives a time signal service signal from the time signal service unit 3 connected thereby. When a predetermined number of advance notification sounds of the time signal service signal are received and the time signal is identified, a time adjustment pulse is applied to the central controller 32 at the rising timing. The central control unit 32 adjusts the time of the clock unit according to the time adjustment pulse, and sends a release request to the automatic time adjustment device 1 upon completion of the adjustment, and the automatic time adjustment device 1 responds to the time signal service unit 3 by the line disconnection request. Disconnect the line between and.

FIG. 7 is a flowchart at the time of time adjustment according to the embodiment of the present invention. The automatic time adjustment device judges whether or not there is a time adjustment request from the central control device 32 (1). Then, an automatic call is made to the time signal service unit 3 to connect the line with the time signal service unit 3 (2).
Then, it is determined whether or not the reception of the notice sound in the time signal service signal has been confirmed (3). That is, the notice sound filter 21 of the band-pass filter / level converter 12 in FIG.
Thus, the signal of the frequency of the notice sound is extracted, and is converted into a rectangular wave by the notice sound level conversion unit 22, and the notice sound recognition identification unit 1
When the signal of the rectangular wave indicating the notice sound continues for a predetermined time by the notice sound recognition unit 25 of No. 3, the notice sound counter 2 is used as the notice sound.
The count is incremented by 6, and the notice sound reception is confirmed by a predetermined number of times, for example, three times.

If the notice sound cannot be confirmed, it is determined whether or not a time-out (4) has occurred. If a time-out has occurred, the process proceeds to step (2). If you can confirm the notice sound,
An enable signal is added to the time adjustment pulse generator 12 (5). Then, it is determined whether or not a time signal has been detected (6). If it cannot be detected, it is determined whether or not a time-out has occurred (7). If a time-out has occurred, the process proceeds to step (2).

When a time signal is received and detected, a time adjustment pulse is transmitted at the rising timing (8). The time adjustment of the clock section is performed by the time adjustment pulse. Then, it is determined whether or not it is a line release request (9), and if it is not a release request, it is determined whether or not a timeout has occurred (1).
0) If the time adjustment of the clock section does not end even if the time adjustment pulse is sent, a release request is not sent, so that a timeout is set. In that case, the process proceeds to step (3) and the reception processing of the time signal service signal is restarted. In the case of a release request, the line is disconnected (11), and the process proceeds to step (1).

The time adjustment in the clock units 2 and 33 is performed, for example, when the time signal sound is transmitted at 10 seconds and 40 seconds, at the rising timing of the time adjustment pulse, the clock unit 2 before the time adjustment is performed. , 33 is adjusted to 40 seconds when it is within the range of 25 or more and 54 or less, adjusted to 10 seconds when it is within the range of 00 or more and 24 or less, and the quartile is increased by 1 when it is 55 or more and less than 00. Then, the time is adjusted to 10 seconds, and time measurement is started from the adjusted time. Such processing can be easily realized by a central control device of the exchange, a microcomputer, or the like.

The present invention is not limited to the above-described embodiments, but can be variously added and changed. For example, a telephone or the like which can be connected to the time signal service unit 3 via a line. The present invention can also be applied to automatic time adjustment of a clock section of various terminal devices.

[0033]

As described above, according to the present invention, reception of a predetermined number of notice sounds, such as three times, is performed by a notice sound counter or the like, and an enable signal is added to the time adjustment pulse generation unit 14; By detecting the reception of the next time signal, the time can be adjusted by adding a time adjustment pulse from the time adjustment pulse generating section 14 to the clock section 2 at the rising timing of the time signal, so that the detection and identification means similar to the notice sound can be obtained. As a result, the time delay of the time adjustment can be minimized as compared with the case where the time signal is detected and identified, and there is an advantage that the accuracy of the clock unit 2 can be improved. In addition, strict detection and identification processing is performed on the notice sound based on its frequency, level, duration, and the like, so that malfunction due to noise or the like can be prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory view of a main part of the automatic time adjustment device according to the embodiment of the present invention.

FIG. 3 is a time chart according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram of an embodiment of the present invention applied to an exchange.

FIG. 5 is a time chart at the time of time adjustment according to the embodiment of the present invention.

FIG. 6 is a sequence chart at the time of time adjustment according to the embodiment of the present invention.

FIG. 7 is a flowchart at the time of time adjustment according to the embodiment of the present invention.

FIG. 8 is a block diagram of a conventional automatic time adjustment device.

FIG. 9 is a time chart of a conventional automatic time adjustment device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Time automatic adjustment apparatus 2 Clock part 3 Time signal service part 11 Automatic calling part 12 Band-pass filter / level conversion part 13 Preliminary sound recognition identification part 14 Time adjustment pulse generation part 15, 16 Interface part

Claims (3)

[Claims] An automatic calling unit for automatically calling a time signal service unit in response to a time adjustment request signal from a clock unit; and a band-pass filter for extracting a signal having a frequency of a preliminary sound and a time signal from the time signal service unit. A notice sound recognition / identification part for recognizing the notice sound signal as a notice sound signal and outputting an enable signal when the signal of the notice sound frequency extracted by the band-pass filter / level change part continues for a predetermined time; A time adjustment pulse generation unit that sends a time adjustment pulse to the clock unit by extracting a signal of the frequency of the time signal from the bandpass filter / level conversion unit when an enable signal from the preview sound recognition and identification unit is input; An automatic time adjustment device comprising: 2. The band-pass filter / level conversion unit converts a signal of the notice sound frequency into a rectangular wave signal by comparing the output signal of the notice sound filter with a reference level. A notice sound level converter, a time sound filter for passing the signal of the time sound frequency, and a time sound level converter for comparing an output signal of the time sound filter with a reference level and converting the signal into a rectangular wave signal. An announcement sound recognition unit that recognizes an announcement sound and outputs a pulse signal when a rectangular wave signal output from the announcement sound level conversion unit is continuous at a predetermined cycle; and an announcement sound recognition unit. A notice sound counter that counts the pulse signal from the unit and outputs an enable signal by recognizing that a predetermined number of notice sounds have been received, and the time adjustment pulse generation unit has the notice sound counter Wherein the rising time signal sound level conversion of the output signal, automatic time adjustment device according to claim 1, characterized in that it comprises a structure for sending the time adjustment pulses to clock unit when the enable signal is input. 3. An automatic calling unit for receiving a time adjustment request signal from the central control unit and automatically calling a time signal service unit when adjusting the time of a clock unit controlled by the central control unit of the exchange; A band-pass filter / level converter for extracting a signal of the frequency of the preliminary sound and the time signal from the time signal service unit; and a signal of the frequency of the preliminary sound extracted by the band-pass filter / level converter for a predetermined time. And an advance notice sound recognition / identification unit for recognizing the notice signal as an advance notice signal and outputting an enable signal, and the time signal from the band-pass filter / level conversion unit when the enable signal is input from the advance notice sound recognition / identification unit. A time adjustment pulse generator for sending a time adjustment pulse for adjusting the time of the clock unit to the central control unit by frequency signal extraction. The automatic time adjustment device according to claim 1.