JPH07159560A - Clock device with time correcting function and time correcting method - Google Patents

Abstract

PURPOSE:To accurately operate the time correcting function by reducing the erroneous detection of time broadcasting. CONSTITUTION:The broadcast signal is received by a broadcast reception section 31. The received signal is fed to a specific frequency detection section 34 constituted of a tone decoder 35. The specific frequency detection section 34 detects the signal having the same frequency as that of the forecast sound signal of the time broadcasting signal. The detected output of the specific frequency detection section 34 is fed to a microcomputer 37 constituted of a time broadcasting coincidence detection section, a time correction section, a clock section, and a timer section. The time broadcasting coincidence detection section detects whether the received signal is the time broadcasting signal or not. When the detected output is fed to the time correction section, the time of the clock section is corrected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, for example, in a video tape recorder or a radio cassette recorder equipped with a timer device or a tuner, detects a time signal included in a received signal to calibrate the present time, and also a timer device. The present invention relates to a timepiece device with a time calibration function and a time calibration method, characterized by calibrating the timer time set in step 1.

[0002]

2. Description of the Related Art A video cassette recorder or the like is equipped with a clock device for displaying the current time. Also,
A timer device capable of setting a desired time based on the current time of the clock device and performing timer reproduction, timer recording, and the like is mounted.

Some of the above-mentioned timepiece devices detect a time signal included in a broadcast audio signal and calibrate the present time accordingly. In such a timepiece device, as the time signal signal detecting means, an analog filter tuned to the frequency of the time signal, a microcomputer (hereinafter, referred to as a microcomputer), a DSP (Digital Signal Pr).
The method of sampling the signal directly is used.

Further, in the timepiece device for calibrating the time as described above, the pattern of the time signal, that is, three forecast sound signals and 1
The time signal is detected by detecting the temporal arrangement of two hourly sound signals. Note that the forecast sound signal is 440H, which is sounded three, two, and one second before the hour in the hourly report.
It is a time signal of z. The hour signal is a time signal signal of 880 Hz that is sounded on the hour.

[0005]

When a filter that tunes to a specific frequency is used to tune to, for example, a forecast sound signal (440 Hz), if the precision of the tuning frequency is ± 2%,
The Q of the filter is Q = 25. Constructing an analog filter that can obtain such a value of Q is
Very difficult.

Further, when a specific frequency is detected by a microcomputer or the like, the time signal is sent to A
It is necessary to read by the microcomputer after the / D conversion. The reading interval of the microcomputer at this time is, for example, the forecast sound signal (4
40 (Hz) detection, 1 (sec) / 440 (H
Since z) = 2.27 (milliseconds), it must be at least about half of that, about 1.13 (milliseconds). This reading interval is a considerable burden on the microcomputer,
It is necessary to use a microcomputer that operates at high speed or a dedicated microcomputer that can realize high speed.

By the way, in the case of detecting the temporal arrangement of three forecast sound signals and one hour sound signal, in broadcasting, a sound signal component having the same frequency as the forecast sound signal and the hour sound signal has a considerable probability. There is a possibility that this voice signal component exists and is detected in the same pattern as the time signal. Therefore, the audio signal component may be erroneously determined to be a time signal, and the timepiece calibration function may malfunction.

That is, in the time signal detection method in which the same component as the forecast sound signal is detected from the broadcast audio signal and it is regarded as a time signal according to the detection interval, theoretically no false detection is made.
Cannot be%. This is because there is no way to determine whether it is a forecast sound signal of a time signal or an audio signal having the same frequency component as the forecast sound signal, which has no meaning of time signal at all.

Further, in the timepiece device which detects the time signal included in the broadcast audio signal and calibrates the present time,
Even when the current time is calibrated, the timer time set by the timer device remains unchanged.

Therefore, an object of the present invention is to detect a time signal of broadcasting and calibrate the time based on the detected time signal, in a timepiece device, wherein a specific frequency detecting means is an analog filter or a dedicated microcomputer. An object of the present invention is to provide a timepiece device with a time calibration function that can obtain a high Q even if it is configured without using it.

Another object of the present invention is to reduce the possibility of malfunction due to false detection of the time signal.
An object of the present invention is to provide a timepiece device with a time calibration function capable of reducing malfunctions of the time signal calibration function.

Still another object of the present invention is to provide a time calibration method capable of accurately detecting a time signal and calibrating the time of the timepiece device and the timer time set by the timer device.

[0013]

According to a first aspect of the present invention, there is provided a broadcast receiving unit, a plurality of specific frequencies in a signal received by the broadcast receiving unit, and a specific frequency for detecting a time interval between the plurality of specific frequencies. A detection unit, a time signal coincidence detection unit that detects whether a plurality of specific frequencies and time intervals match the frequency and time intervals of the plurality of forecast sound signals of the time signal, and the current time based on the detection output of the time signal coincidence detection unit. It is a timepiece device with a time calibration function, which comprises a time calibration unit for calibrating.

According to a fourth aspect of the present invention, the forecast sound signal of the time signal, the hourly signal of the time signal, and the silent state time generated before the forecast sound signal in the received signal are detected to detect the forecast sound signal. Detecting whether the hourly sound signal and the silent state time match the forecast sound signal, the hourly sound signal and the silent state time of the regular time signal, and detecting whether the forecast sound signal and the hourly sound signal match and the silent state time. Calibrate the current time based on the match detection of
It is a time calibration method for displaying the current time.

[0015]

The broadcast signal is received by the broadcast receiving unit 31.
The broadcast signal is supplied to the specific frequency detection unit 34.
The specific frequency detection unit 34 detects a signal (prediction sound signal) having a preset frequency component from the signal supplied from the broadcast reception unit 31. The detection output is supplied to the time signal coincidence detection section in the microcomputer 37. The time signal coincidence detection unit determines whether or not the signal received by the broadcast reception unit 31 is a time signal, based on the detection output of the specific frequency detection unit 34. The detection output of the time signal coincidence detection unit is supplied to the time calibration unit. The time calibration unit calibrates the time of the clock unit based on the detection output supplied from the time signal coincidence detection unit.

[0016]

Embodiments of the timepiece device according to the present invention will be described below with reference to the drawings. FIG. 1 is a first system block diagram of a radio cassette recorder equipped with a timepiece device according to the present invention. The radio cassette recorder includes a broadcast receiving unit 31, a specific frequency detecting unit 34, a time signal coincidence detecting unit, a time calibrating unit, a clock unit and a timer unit 36. The broadcast receiving unit 31 includes an antenna 32 and a tuner 33. The specific frequency detection unit 34 is a tone decoder 35 that detects a forecast sound signal. The time signal coincidence detection unit, the time calibration unit, the clock unit and the timer unit 36 are
It is composed of the microcomputer 37. Although not shown, a timer device for realizing timer reproduction, timer recording, etc. is installed.

A broadcast is received by the antenna 32, and a desired broadcast station is selected by the tuner 33. The voice signal of the station is supplied to the tone decoder 35. In addition,
The tone decoder 35 is set to detect a signal having the same frequency as the forecast sound signal. Tone decoder 3
The output of 5 is supplied to the microcomputer 37. Microcomputer 37
When the input signal is detected by the time signal coincidence detection unit of the microcomputer, the time calibration unit of the microcomputer 37 calibrates the time of the clock unit. In conjunction with this, the timer time set by the timer setting unit is also calibrated. The calibrated time is displayed on the clock display unit (not shown). The tone decoder 35 is basically a PLL circuit, can function as an analog filter having a high Q, and can be configured relatively easily.

FIG. 2 is a block diagram of the tone decoder 35. The tone decoder 35 includes a phase comparator 1, a low pass filter (hereinafter, LPF) 2, an error amplifier 3, and a voltage controlled oscillator (hereinafter, VCO) 4.
And consists of an automatic control loop.

The structure and operation of the block shown in FIG. 2 will be described below. The phase comparator 1 is supplied with an input signal ei having a frequency of ωi and an output signal eo of the VCO 4 having an oscillation frequency of ωo. The phase difference between the input signal ei and the output signal eo of the VCO 4 is θi.
The phase error signal Ve formed based on the input signal ei and the output signal eo of the VCO 4 is supplied to the LPF 2. The LPF 2 extracts only the low-frequency component signal V1 of the supplied signal and supplies the signal V1 to the error amplifier 3. The signal V1 amplified by the error amplifier 3 is supplied to the VCO 4 as the signal Vd. The oscillation frequency of the VCO 4 changes according to the control signal. In FIG. 2, the control signal is the signal Vd.

The control signal Vd controls the oscillation frequency ωo of the VCO 4 so as to approach the frequency ωi of the input signal ei. Oscillation frequency ω of signal output from VCO4
o approaches the frequency ωi of the input signal ei, and finally the oscillation frequency ω o = frequency ωi (lock state). Once locked, the oscillation frequency ωo of the VCO 4 is always kept in phase with the frequency ωi of the input signal unless a phase difference occurs again.

In the locked state, the frequency ω of the input signal
When a phase difference occurs between i and the oscillation frequency ω0, the control signal Vd changes. The VCO 4 operates in a direction to make the oscillation frequency ω0 the same as the phase of the frequency ωi of the input signal, and maintains the lock state. That is, even if the frequency ωi of the input signal changes,
The output signal of the VCO 4 will follow the frequency of the input signal. The range of frequencies that can maintain this locked state is called the lock range. Further, the width of the frequency that enters the locked state when the frequency of the input signal is changed while the tone decoder 35 is not yet locked is called the capture range.

A mixer, for example, is used for the phase comparator 1. When the input signal ei and the output signal eo of the VCO 4 are ei = Kisin (ωit + θi) eo = Kocos (ωot), the phase error signal Ve of the phase comparator 1 is Ve = eo × ei = (KiKo / 2) [ sin {(ωi-ωo) t + θi} + sin {(ωi + ωo) t + θi}] ... (1).

Since this phase error signal Ve is passed through the LPF 12, it can be considered that "sin {(ωi + ωo) t + θi}" in the equation (1) cannot pass through the LPF 12. Therefore, LP
The output signal V1 of F2 is V1 = (KiKo / 2) sin {(ωi-ωo) t + θi}.

The signal V1 is input to the VCO 4 via the error amplifier 3. Here, when the constant of proportionality is K, it can be expressed as Vd = Ksin {(ωi-ωo) t + θi}.

When there is no input signal, the phase comparator 1 does not output an error signal. Therefore, the output signal Vd of the error amplifier 3 becomes zero. Therefore, the VCO 4 oscillates at the oscillation (free running) frequency ω o.

When the tone decoder 35 is locked, ωi = ω0 and Vd = Ksin {θi} as described above. In the locked state, this becomes the control signal for the VCO 4.

On the other hand, when the tone decoder 35 is not locked, only the beat component of (ωi-ωo) is LPF2.
Since it is supplied to the VCO 4 as the control signal Vd via V.sub.d, Vd = Ksin {(.omega.i-.omega.t) +. Theta.i}. However, if the difference of (ωi−ωo) is too large, this component is also removed by the LPF2.
The control signal Vd cannot be obtained and cannot be locked. Therefore, VCO
4 will oscillate at each free-running frequency ω o.

As the LPF 2, for example, a filter as shown in FIG. 3 can be used. The lock range (ω1) and the capture range (ωc) at that time are expressed as ωi = Kvωc = Kv | F (jωc) | ≈√ (ω1 / RC) = √ (Kv / RC). Where Kv is the total loop gain and F
(j ω) is the transfer characteristic of the LPF, and R and C are the values of the resistor and the capacitor forming the filter.

As described above, the tone decoder outputs the phase-locked output signal only when the input signal is close to the predetermined frequency with respect to the preset frequency. The capture range at that time is determined by the values of the elements forming the LPF.

By the way, the central portion of the tone decoder has already been integrated into an IC. FIG. 4 is a block diagram of the tone decoder IC. The tone decoder IC is P
It is composed of an LL circuit 11, a detection circuit 12, a voltage comparison circuit 13, and a logic drive circuit 14. When the input signal is in the pass band, the PLL circuit 11 locks to the input signal as described above. At this time, the voltage of the detection circuit 12 drops, and the voltage comparison circuit 13 and the output logic drive circuit 14 are turned on.

Therefore, the tone decoder becomes active only when the frequency of the input signal is close to the preset frequency. Further, the frequency that reacts at that time is the capture range of the PLL circuit, and its width depends on the element that constitutes the LPF. In fact, in many tone decoder ICs, of the elements that make up the LPF, the resistor is built in the IC in advance and only the capacitor is used as an external component.

Since the width of the capture range appears as the square root of the capacitor value, the error is also halved. Therefore, the error is halved even if a relatively inaccurate element is used.

FIG. 5 is a circuit diagram of a tone decoder using the tone decoder IC. The oscillation frequency is determined by the capacitor 21 and the resistor 22. Therefore, adjusting the values of these elements determines the frequency that the circuit detects. Further, the capacitor 23 is an element that constitutes the LPF. Therefore, the capture range can be determined by the value of this element.

For example, if the circuit reacts to 440 Hz by the capacitor 21 and the resistor 22 and the capture range is set to ± 2% by the capacitor 23, when the input frequency is 440 Hz ± 2%, The circuit becomes active. This is a circuit that operates equivalently to an analog filter with Q = 25.

Here, the capture range is the capacitor 2
It can be determined relatively only by 3, and the accuracy thereof is half the error accuracy of the capacitor 23 as described above, so that it can be adjusted relatively easily.

As described above, the tone decoder is a circuit that functions as an analog filter having a high Q. Further, it is easier to design the tone decoder than to configure the analog filter.

FIG. 6 is a waveform diagram of an example of the time signal.
As can be seen from FIG. 6, the time signal is 3 at 440 Hz.
One forecast sound signal and one hour sound signal of 880 Hz. The length of the forecast sound signal is 100 msec, and the interval between the forecast sound signal and the next forecast sound signal is 900 msec. Hereinafter, description will be given by taking the time signal shown in this waveform as an example.

FIG. 7 is a diagram showing the relationship between the time signal and the output of the tone decoder. FIG. 7A shows the waveform of the time signal, and FIG. 7B shows the output waveform of the tone decoder when this time signal is the input signal. The output waveform of the tone decoder shown in FIG. 7B is input to the time signal coincidence detection unit. Here, the time signal coincidence detection unit is easily realized by software of a microcomputer. In the microcomputer, the input signal is 440H
Since it is not necessary to determine whether or not z, it is not necessary to use a dedicated microcomputer, and a microcomputer that operates at a relatively low speed can be used.

FIG. 8 shows the output signal waveform of the tone decoder for detecting the forecast sound signal and the waveform of the detection pattern for matching the time signal. FIG. 8A shows a temporal transition of a signal for the time signal coincidence detection unit to regard an input signal (output signal of the tone decoder) as a time signal, and FIG. 8B shows a waveform of a detection pattern having the same frequency as the forecast sound signal.
The time-match detection algorithm measures each signal and the length between the signals, and if it matches the detection pattern,
The result that the input signal was the time signal is output. The time calibration unit calibrates the time of the clock unit based on the result. Further, the time set by the timer setting unit is also calibrated in conjunction with the time of the clock unit being calibrated. The calibrated time is displayed on the clock display unit.

As described above, the time signal is composed of the forecast sound signal of 440 Hz and the hour sound signal of 880 Hz. Therefore,
If a tone decoder that detects 440 Hz and a tone decoder that detects 880 Hz are used, more accurate detection of the time signal can be performed.

FIG. 9 is a second system block diagram of a radio cassette recorder equipped with a timepiece device with a time calibration function according to the present invention. As is clear from FIG. 9, two tone decoders are provided in this system block. The forecast sound signal and the hourly sound signal are separately detected by each tone decoder. This radio cassette recorder includes a broadcast receiver 41, a specific frequency detector 44, a time signal coincidence detector, a time calibration unit, a clock unit and a timer unit 47.
Consists of. The broadcast receiving unit 41 includes an antenna 42 and a tuner 43. The specific frequency detection unit 44 includes a tone decoder 45 that detects a forecast sound signal and a tone decoder 46 that detects an hourly sound signal. Further, the time signal coincidence detection unit, the time calibration unit, the clock unit and the timer unit 47 are
It is composed of a microcomputer 48 having U, RAM, ROM and I / O. Incidentally, although not shown, a timer device capable of setting a desired time based on the time displayed on the clock device and performing timer reproduction, timer recording, etc. is mounted.

The broadcast is received by the antenna 42, and the desired station is selected by the tuner 43. The voice signal of the selected station is supplied to the tone decoders 45 and 46. The tone decoder 45 is set to detect a signal having the same frequency as the forecast sound signal, and the tone decoder 46 is set to detect a signal having the same frequency as the hour sound signal.

The outputs of the tone decoders 45 and 46 are supplied to the microcomputer 48. In the microcomputer 48, when the input signal is determined to be a time signal by the time signal coincidence detection unit of the microcomputer 48, the time of the clock unit is calibrated by the time calibration unit of the microcomputer 48. In conjunction with this, the timer time set by the timer setting unit is calibrated. The calibrated time is displayed on the clock display unit.

Although two types of tone decoders are used in FIG. 9, the detection frequency of the tone decoder is determined by the resistor R and the capacitor C, which are external components, as described above. Therefore, these elements alone constitute two sets of circuits for detecting the forecast sound signal and the circuit for detecting the hourly sound signal, and by switching between them, only one type of tone decoder needs to be provided.

FIG. 10 shows the relationship between the time signal and the outputs of the two types of tone decoders. FIG. 10A is a waveform of the time signal when the time signal is an input signal, and FIG. 10B is an output waveform of the tone decoder 45 that detects the prediction sound signal.
FIG. 10C shows output waveforms of the tone decoder 46 for detecting the hourly sound signal. By inputting the output waveforms of the tone decoder shown in FIGS. 10B and 10C to the time signal coincidence detection circuit, a more accurate prediction sound signal can be detected.

FIG. 11 shows the output waveform of the tone decoder that detects the forecast sound signal and the hourly sound signal, and the waveform of the detection pattern for matching the time signal. 11A shows the output waveform of the tone decoder for detecting the prediction sound signal, FIG. 11B shows the output waveform of the tone decoder for detecting the hourly sound signal, and FIG. 11C shows the detection pattern waveform of the same frequency as the prediction sound signal. 11D shows the waveform of the detection pattern of the same frequency as the hour sound signal. The time-match detection algorithm measures each signal and the length between the signals, and if it matches this detection pattern, it outputs the result that its input was a time-signal.

As described above, by providing the two tone decoders, that is, the tone decoder for the forecast sound signal and the tone decoder for the hourly sound signal, the parameter for time signal matching can be doubled. it can. Therefore, the accuracy of time signal matching can be improved.

By the way, as shown in FIG. 12, some time signal signals generate a silent state for 3 seconds or more (between) before the first forecast sound signal. When the timepiece function-equipped timepiece device according to the present invention is applied to such a time signal, the forecast sound signal is detected, and a silent state of 3 seconds or more (between) is detected before the forecast sound signal is detected. Only when the signal is detected, the prediction sound signal detector may be made to judge that the signal is a time signal.

FIG. 13 shows a flowchart of the algorithm of the prediction sound signal detecting section which operates in this way.
In step 51, measurement of the length of time during which a signal component having the same frequency as the forecast sound signal (hereinafter, forecast sound signal component) does not exist in the input signal is started. That is, the timer is reset and started here.

In step 52, it is judged whether or not there is a forecast sound signal component in the input signal. When it is not determined that the forecast sound signal component is present, the process of step 52 is repeated. On the other hand, if it is determined that the forecast sound signal component is present, the process proceeds to the switch 53. In step 53, the measurement of the time length in which the forecast sound signal component does not exist is ended. That is, the timer started in step 51 is stopped in step 53. As a result, the detection of the silent state before the first forecast sound signal is detected ends.

In step 54, it is judged whether or not the time length of the measured timeless signal is 3 seconds or more. If it is determined to be less than 3 seconds, the process proceeds to step 65, and if it is not a time signal, it is output from the time signal coincidence detecting section. on the other hand,
If it is determined to be 3 seconds or more, the process proceeds to step 55. In step 55, measurement of the length of the forecast sound signal is started. That is, the timer is reset here and restarted. Thereafter, the process proceeds to step 56.

At step 56, it is judged whether or not there is a forecast sound signal component. When the forecast sound signal component is present, step 56 is repeated, and when the forecast sound signal component is not present, the routine proceeds to step 57. In step 57, the measurement of the length of the forecast sound signal component is ended. That is, the timer started at step 55 is stopped here. Thereafter, the process proceeds to step 58.

In step 58, it is judged whether or not the length of the measured forecast sound signal component is the same as the length of the forecast sound signal of the time signal. If they are not the same, the process proceeds to step 65, and the input signal is output as not a time signal. On the other hand, if they are the same, it is determined that the input signal is one of the forecast sound signals, and the process proceeds to step 59.

At step 59, it is judged if the detected forecast sound signal component is the third forecast sound signal. If it is the third forecast sound signal component, the process proceeds to step 64, and it is output that it coincides with the time signal. That is, since the series of forecast sound signal components detected so far coincides with the time signal, it is determined that the input signal is the time signal, and this is the output of the time signal coincidence detecting section. On the other hand, if it is not the third forecast sound signal, the process proceeds to step 60. In step 60, measurement of the length between the prediction sound signal components is started. That is, the timer is reset and restarted here. Thereafter, the process proceeds to step 61.

In step 61, it is judged whether or not there is a forecast sound signal component in the input signal. If there is no forecast sound signal component, step 61 is repeated. On the other hand, if there is a forecast sound signal component, the process proceeds to step 62. In step 62, the measurement of the length between the predicted sound signal components is finished. That is, the timer started at step 60 is stopped here. Thereafter, the process proceeds to step 63.

In step 63, it is judged whether or not the length between the measured forecast sound signal components is the same as the length between the forecast sound signals of the time signal. If not, step 65
If the time signal is not coincident with the time signal, it is output. On the other hand, if they are the same, the process returns to step 55. After step 65, the process of step 51 is repeated.

As a result, even if the forecast sound signal component is present in the input signal at the same time interval as the time signal, when some signal component is present within 3 seconds before the detection of the first forecast sound signal, It can be determined that this is not the time signal, and the possibility of erroneously detecting this signal component as the time signal can be reduced. Therefore, the malfunction of the time calibration can be reduced.

As described above, the time signal detection accuracy can be further improved by detecting the silent state. Also, by detecting the same signal component as the hourly sound signal,
It is possible to more strictly discriminate the silent state for 3 seconds before the first forecast sound signal and further improve the accuracy of time signal detection. Furthermore, by detecting another frequency component, it is possible to more strictly discriminate the silent state, and thus it is possible to further improve the accuracy of time signal detection.

In the above-described embodiment, the case where the timepiece device with the time calibration function according to the invention is mounted on the radio cassette recorder is shown, but the mountable device is not limited to the radio cassette recorder. This invention
It is applicable to general electronic devices such as video tape recorders and compact disc players.

[0060]

According to the present invention, since the circuit for detecting the time signal is composed of the tone decoder, it is not necessary to use an analog filter or a dedicated microcomputer, and a high Q can be obtained. Further, by detecting the silent state for 3 seconds before the time signal, it is possible to reduce erroneous detection of the time signal. That is, the malfunction of the time calibration can be reduced.

[Brief description of drawings]

FIG. 1 is a system block diagram of a timepiece device with a time calibration function according to the present invention.

FIG. 2 is a block diagram of a tone decoder.

FIG. 3 is a circuit diagram of a low pass filter.

FIG. 4 is a block diagram of a tone decoder IC.

FIG. 5 is a circuit diagram of a tone decoder using a tone decoder IC.

FIG. 6 is a waveform diagram of an example of a time signal.

FIG. 7 is a diagram showing a relationship between a time signal and an output of a tone decoder.

FIG. 8 is a waveform diagram of an output signal waveform of a tone decoder that detects a prediction sound signal and a detection pattern for matching the time signal.

FIG. 9 is a system block diagram of a timepiece device with a time calibration function provided with two tone decoders according to the present invention.

FIG. 10 is a diagram showing a waveform of a time signal and output waveforms of two tone decoder circuits for detecting a prediction sound signal and an hourly sound signal.

FIG. 11 is a waveform diagram of an output waveform of a tone decoder circuit that detects a prediction sound signal and an hourly sound signal, and a detection pattern for matching the time signal.

FIG. 12 is a waveform chart of an example of a time signal.

FIG. 13 is a flowchart of an algorithm of a prediction sound signal detection unit.

[Explanation of symbols]

2 Low-pass filter 31, 41 Broadcast receiving unit 34, 44 Specific frequency detecting unit 35, 45, 46 Tone decoder 36, 47 Time signal matching detecting unit, time calibration unit, clock unit and timer unit

Claims (7)

[Claims] 1. A broadcast receiving section, a specific frequency detecting section for detecting a plurality of specific frequencies in a signal received by the broadcast receiving section and time intervals of the plurality of specific frequencies, the plurality of specific frequencies and the above From a time signal coincidence detection unit that detects whether the time interval matches the frequencies and time intervals of the plurality of forecast sound signals of the time signal, and a time calibration unit that calibrates the current time based on the detection output of the time signal coincidence detection unit. A clock device with a time calibration function. 2. A broadcast receiving unit, a first specific frequency in a signal received by the broadcast receiving unit, a second specific frequency that is an integer multiple of the first specific frequency, and the first specific frequency. A specific frequency detection unit for detecting a silent state generated before, and whether the first specific frequency, the second specific frequency and the time of the silent state match the frequency of the time signal and the time of the silent state. A timepiece device with a time calibration function, which comprises a time signal coincidence detection unit for detecting the time, a time calibration unit for calibrating the current time based on the detection output of the time signal coincidence detection unit, and a time display unit for displaying the current time. 3. The timepiece device with time calibration function according to claim 2, wherein the first specific frequency is a forecast sound signal of a time signal, and the second specific frequency is a true hour signal of the time signal. 4. The forecast sound signal of the hourly signal, the hourly sound signal of the hourly signal, and the silent state time generated before the forecast sound signal in the received signal are detected, and the forecast sound signal and the hourly signal are detected. It is detected whether the sound signal and the silent state time match the forecast sound signal of the regular time signal, the hour sound signal and the silent state time, and the detection of the coincidence of the forecast sound signal and the hour sound signal and the silent state. A time calibration method for calibrating current time based on detection of coincidence of time and displaying the current time. 5. The timepiece device with time calibration function according to claim 2, wherein the timepiece device with time calibration function is a timer device for controlling an electronic device. 6. The recording device according to claim 5, wherein the electronic device includes a timer device. 7. The timepiece device with time calibration according to claim 1 or 2, wherein the specific frequency detection unit is composed of a tone decoder.