JP2005091114A - Clock adjustment system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately correct a time in a clock adjusting system for AV-related equipment. <P>SOLUTION: This clock adjusting system 2 receives a standard radio wave under a stop condition of the AV-related equipment by a tuner 21 via an antenna 3, by outputting frequency information of a long wave of standard radio wave from a control part 22 to the tuner 21. The tuner 21 detects a time code from the received standard radio wave to be output to the control part. The control part 22 obtains a standard time from the detected time code to correct the time of clock 23, based on the standard time. The clock 23 displays the corrected time. Since the standard radio wave is received under the stop condition of the AV-related equipment, an electric noise is restrained to receive the stable standard radio wave surely, and the time is corrected accurately. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a timepiece adjusting device for AV related equipment, and more particularly to a timepiece adjusting device using standard radio waves.

  Conventionally, there are many AV-related devices equipped with a clock, but if this clock is shifted, the user will misunderstand the time, and a VTR or the like will display a program during timer scheduled recording. There was a possibility that it could not be recorded from the beginning to the end. For this reason, as a device for correcting the time of the clock of the AV-related device, for example, a clock adjusting device using time information of television broadcasting is known. However, in such a timepiece adjusting device, since the television broadcast is received and the time is corrected, this device cannot be used in a device not equipped with a TV tuner.

On the other hand, in recent years, in the United States, Germany, the United Kingdom, Japan, etc., information on standard time (JST) based on Coordinated Universal Time (UTC) has been transmitted using standard radio waves. It has become widespread. The radio clock receives the standard radio wave transmitted from the transmitting station based on the cesium atomic clock with the antenna, detects the time code of the received standard radio wave, and automatically corrects the time based on the detected time code And display. As an AV-related device using such a radio clock, for example, a radio clock having a function of receiving a standard radio wave is built in the apparatus, and an accurate clock display is provided by providing a function for correcting the clock time by itself. A magnetic recording / reproducing apparatus that can be used is known (for example, see Patent Document 1).
JP-A-6-258460

  However, in the invention described in Patent Document 1, since the standard radio wave is received and the time is corrected regardless of whether or not the apparatus is in a recording or reproducing operation, it is generated from the apparatus during the operation of the apparatus. There is a possibility that a stable standard radio wave cannot be received due to the influence of electrical noise.

  The present invention has been made to solve the above-described problems, and provides a timepiece adjustment device that can suppress the influence of noise, receive a stable standard radio wave, and correct the time accurately. With the goal.

  In order to achieve the above object, the invention according to claim 1 includes the time measuring means for measuring time, the receiving means for receiving a standard radio wave including a time code, and the time measured by the time measuring means is included in the standard radio wave. In a time adjustment device for an AV-related device provided with time correction means for correcting the standard time based on a time code, the time until the operation start time of the AV-related device set by a user is counted, and the time is set as the operation start time. Timer control means for operating the AV-related equipment when it becomes, and stop state detection means for detecting the stop state of the AV-related equipment, and the time correction means is connected to the AV-related device by the stop state detection means. When the stop state of the device is detected and the time is a predetermined time or more before the operation start time, the receiving means When the standard radio wave is received at a fixed period and the time is corrected, and the stop state of the AV-related device is detected, and the time is within a predetermined time from the operation start time. The standard time signal is continuously received to correct the time.

  In this configuration, since the standard radio wave is received when the AV-related device is stopped, electrical noise can be suppressed and a stable standard radio wave can be received. Further, when the time is a predetermined time or more before the operation start time, the standard radio wave is received at a constant period and the time is corrected efficiently. In addition, when the time is within a predetermined time from the operation start time, the standard time is continuously received and the time is corrected. Based on the timer control.

  According to a second aspect of the present invention, there is provided a time measuring means for measuring time, a receiving means for receiving a standard radio wave including a time code, and a time measured by the time measuring means based on a time code included in the standard radio wave. A time adjustment device for an AV-related device provided with a time correction unit for correcting, further comprising a stop state detection unit for detecting a stop state of the AV-related device, wherein the time correction unit is configured to detect the AV-related device by the stop state detection unit. When the stop state of the device is detected, the standard radio wave is received by the receiving unit at a constant period, and the time is corrected to the standard time.

  In this configuration, since the standard radio wave is received at a constant period when the AV-related device is stopped, electrical noise can be suppressed and a stable standard radio wave can be received efficiently.

  According to a third aspect of the present invention, in the timepiece adjusting device according to the second aspect, when the time is corrected by the time correction means, the standard radio wave is continuously received instead of receiving the standard radio wave at a constant period. It is characterized in that it is received in

  In this configuration, since the standard radio wave is continuously received and the time is corrected to the standard time when the AV-related device is stopped, the time can be counted using the standard radio wave.

  As described above, according to the first aspect of the present invention, since the time is corrected using the standard radio wave, for example, accurate time correction can be performed without using the time signal information of the television broadcast. . In addition, since the standard radio wave is received when the AV-related device is in a stopped state, it is possible to suppress the electrical noise and reliably receive the stable standard radio wave and correct the time.

  In addition, when the time is within a predetermined time from the operation start time, the time can be counted using a standard radio wave and the timer can be controlled based on the accurate time. It is possible to prevent mistakes such as recording.

  According to the invention of claim 2, since the standard radio wave is received when the AV-related device is stopped, the electrical noise is suppressed, the stable standard radio wave is reliably received, and the time is accurately corrected. can do.

  According to the invention of claim 3, since the standard radio wave is continuously received, it is possible to count an accurate time based on the standard time even if the AV-related device itself does not have a high-precision clock. .

  Hereinafter, a timepiece adjusting apparatus for an AV related apparatus according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, an AV-related device (hereinafter simply referred to as “device”) 1 is a device including a clock adjusting device 2, a recording unit 11, and an output unit 12, and is an AM distributed from a broadcasting station. This is a device for receiving a radio broadcast signal via an antenna 3 connected to the device 1, recording an audio signal included in the AM radio broadcast signal in the recording unit 11, and outputting the audio signal to the output unit 12. . As the recording unit 11, various storage devices such as an MD (Mini-Disc) recording / reproducing device, an HDD (Hard Disc Drive), and an optical disc recording / reproducing device are used. The timepiece adjusting device 2 is for correcting the time, and includes a tuner 21, a control unit 22, a timepiece 23, and a timer circuit 24.

  The tuner 21 receives the radio broadcast signal of the channel instructed to select via the antenna 3 by tuning the reception frequency to the frequency corresponding to the channel instructed to select under the control of the control unit 22. To do. In addition, the tuner 21 receives the long wave standard radio wave when the device 1 is in a stopped state, that is, when the device 1 does not receive a radio broadcast signal and the recording unit 11 or the like is not operating. The time code is detected from the radio wave and output to the control unit 22. The control unit 22 generates an audio signal from the radio broadcast signal input from the tuner 21, outputs the audio signal to the recording unit 11 or the output unit 12 and records the audio signal in the recording unit 11, or outputs the audio signal from the output unit 12. Let In addition, the control unit 22 analyzes the time code input from the tuner 21 and obtains a standard time for correcting the clock 23. Thus, by receiving the radio broadcast signal and the standard radio wave using the same tuner 21, the installation space of the tuner 21 can be reduced and the cost can be reduced.

  The clock 23 counts and displays the current time by counting clock pulses from a crystal oscillator (not shown). The timer circuit 24 counts the time until the timer reservation recording operation start time preset by the user, and starts recording of the audio signal to the recording unit 11 when the time of the clock 23 becomes the reservation recording start time. .

  Next, the time code included in the standard radio wave will be described with reference to FIG. The time code T is determined by minute, hour, day of the year, year (last two digits), day of the week, marker M, position markers P0 to P5, leap second information LS1, LS2, parity PA1, PA2, spare bits SU1, SU2, etc. These data are transmitted as 1 frame per minute at 1 bit / second. The hour, minute, total date, year, and day of the week are represented by a BCD (Binary Coded Decimal) code. For example, the minute information includes a bit A1 indicating “40 minutes”, a bit A2 indicating “20 minutes”, and “10”. Bit A3 indicating “minute”, bit A4 indicating “8 minutes”, bit A5 indicating “4 minutes”, bit A6 indicating “2 minutes”, bit A7 indicating “1 minute”, for example, 15 To represent the minute, bit A3, bit A5, and bit A7 are each "1", and the other bits A1, A2, A4, and A6 are "0".

  The marker M represents the minute (0 seconds per minute), and the position markers P0 to P5 indicate the positions of 9 seconds, 19 seconds, 29 seconds, 39 seconds, 49 seconds, and 59 seconds, respectively. The leap second information LS1, LS2 indicates whether there is a leap second within one month. Parities PA1 and PA2 are provided corresponding to the hour and minute, and are used to determine whether or not data has been correctly received. The spare bits SU1, SU2 are for future expandability, for example, giving meaning as daylight saving time information.

  As shown in FIG. 2B, the standard radio wave is composed of three types of pulses. Each pulse width is 0.2 s for the marker M and the position markers P0 to P5, 0.8 s for the data “0”, 0.5 s for the data “1”, and 55% rise of each pulse signal. The value is synchronized with the standard second signal. In the present embodiment, accurate second information is acquired by synchronizing at the 55% value of the rising edge of the pulse, thereby correcting the clock 23 at the correct time.

  Next, the time correction operation of the timepiece adjusting device 2 will be described. The timepiece adjusting device 2 receives the standard radio wave by the tuner 21 via the antenna 3 by outputting frequency information of the long wave standard radio wave from the control unit 22 to the tuner 21. The tuner 21 detects the time code T from the received standard radio wave and outputs it to the control unit 22. The control unit 22 obtains the standard time from the detected time code T, and corrects the time of the clock 23 based on the standard time. The clock 23 displays the corrected time.

  Next, the timer reservation recording procedure of the device 1 will be described with reference to FIG. The control unit 22 determines whether or not two minutes before the timer reservation recording operation start time set by the user when the device 1 is stopped (S1). If it is determined that it is not two minutes before the operation start time (NO in S1), it is determined whether two hours have passed since the previous time correction (S2). If two hours have passed since the previous time correction (YES in S2), the standard radio wave is received (S3), the time is corrected (S4), and two hours have passed since the previous time correction. If (NO in S2), the determination is made by repeating the steps of S1 and S2. By operating in this way, the standard radio wave is received every 2 hours and the time is efficiently corrected until 2 minutes before the operation start time. On the other hand, if it is determined that it is two minutes before the operation start time (YES in S1), the standard radio wave is received (S5) and the time is corrected (S6). If the time is not the operation start time (NO in S7), S5 and S6 are repeated, the standard radio wave is continuously received, and the time is counted using the standard radio wave. When the time reaches the operation start time (YES in S7), the recording operation is started (S8).

  According to the invention having such a configuration, since the time is corrected using the standard radio wave, it is possible to correct the time accurately without using the time signal information of the television broadcast. In addition, since the standard radio wave is received when the AV-related device 1 is in a stopped state, electrical noise can be suppressed, and a stable standard radio wave can be reliably received to accurately correct the time.

  Further, when the time is within a predetermined time from the operation start time, the standard radio wave is continuously received. Therefore, even if the AV-related device 1 does not have a high-precision clock, it is accurate based on the standard time. Time can be counted. In addition, since timer control can be performed based on accurate time, it is possible to prevent mistakes in timer reserved recording due to time lag.

  In addition, this invention is not restricted to the said structure, A various deformation | transformation is possible. For example, the AV-related device to which the present clock adjustment device is applied may be a device that can receive other broadcast signals such as FM radio broadcast, television broadcast, or other AV-related device. The configuration of the standard radio wave is not limited to the above embodiment, and the carrier wave may be a radio wave other than a long wave. Further, the period for receiving the standard radio wave when the AV-related device is stopped is not limited to two hours, and the time for continuously starting reception of the standard radio wave may not be two minutes before the operation start time.

1 is a block diagram of a timepiece adjustment device for an AV-related device according to an embodiment of the present invention. (A) is a figure which shows the time code of a standard radio wave, (b) is a figure which shows the pulse of a standard radio wave. The flowchart which shows the timer reservation recording procedure of the apparatus.

Explanation of symbols

1 AV-related equipment 2 Clock adjusting device 21 Tuner (reception means)
22 Control unit (time correction means)
23 Clock (clocking means)
24 Timer circuit (timer control means)
T Time code

Claims (3)

Time measuring means for measuring time, receiving means for receiving a standard radio wave including a time code, and time correcting means for correcting the time measured by the time measuring means based on a time code included in the standard radio wave. In the timepiece adjustment device of the AV related equipment provided,
Timer control means for counting the time until the operation start time of the AV-related device set by the user and operating the AV-related device when the operation start time is reached,
A stop state detecting means for detecting a stop state of the AV-related device,
The time correction unit is configured to receive the reception when the stop state of the AV-related device is detected by the stop state detection unit and the time is a predetermined time or more before the operation start time. When the standard radio wave is received at a fixed period by the means to correct the time, and the stop state of the AV related device is detected, and the time is within a predetermined time from the operation start time. Is a timepiece adjusting device that continuously receives the standard radio wave and corrects the time. Time measuring means for measuring time, receiving means for receiving a standard radio wave including a time code, and time correcting means for correcting the time measured by the time measuring means based on a time code included in the standard radio wave In the timepiece adjustment device of the AV related equipment provided,
A stop state detecting means for detecting a stop state of the AV-related device;
The time correction means corrects the time by receiving the standard radio wave at a fixed period by the receiving means when the stop state of the AV-related device is detected by the stop state detection means. A timepiece adjusting device characterized by that.   3. The timepiece according to claim 2, wherein when the time is corrected by the time correction means, the standard radio wave is continuously received instead of receiving the standard radio wave at a constant period. Adjusting device.

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