JP2000321383A - Timepiece device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain miniaturization and low cost by receiving electric wave from a CDMA portable telephone base station, and correcting the time of a timepiece based on time information obtained by demodulating CDMA system time information superposed on the electric wave. SOLUTION: An antenna 1 receives electric wave from a base station, and down-converts it by a high frequency receiving part 2. A mixer 3 for inverse diffusion mixes this signal with PN source, and performs deinterleave and decoding by deinterleave and a decoding part (hereafter decoding part) 6. A time data extracting part 7 extracts and holds data of system time from the signal from the decoding part 6, and time judgement is performed in a time signal judging part 8. A built-in timepiece part 12 is provided with a timepiece part using a crystal oscillator and outputs time data for measurement. A time difference measuring part 10 compares time data obtained by the time signal judging part 8 with the time data for measurement to measure the time difference. A correcting signal generating part 11 generates a correcting signal based on the time difference to send it to the built-in timepiece part 12, and corrects the time data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clock device having a function of receiving time information superimposed on a signal transmitted from a base station and correcting a time lag of a built-in clock.

[0002]

2. Description of the Related Art In Japan, a long-wave standard radio wave JG2AS including a time code is transmitted, and a radio-controlled timepiece can measure the time by receiving the standard radio wave. Further, as described in JP-A-09-292478, there is a clock device that corrects the time of a built-in clock using time information multiplexed in teletext broadcasting. A GPS built-in clock device mounted on a vehicle is disclosed in Japanese Patent Application Laid-Open No. 08-154.
As described in JP-A-63-63, the time coefficient value of the clock IC is corrected using time information contained in radio waves from GPS satellites.

[0003]

However, a timepiece device that receives a long-wave standard time signal and performs time correction requires a relatively large-scale receiving device having a relatively large antenna for receiving the long-wave standard time signal. In addition, since the long wave standard radio wave transmitted from the standard radio wave transmitting station does not cover the whole of Japan, there are places where time correction using the long wave standard radio wave cannot be performed.

When time information multiplexed in teletext broadcasting is used, it is effective in a device provided with a means for receiving teletext broadcasting, but a timepiece by radio waves of teletext broadcasting is used in a dedicated clock device. If an attempt is made to add a correction function, the circuit scale becomes large and the cost increases. Further, a dedicated relatively large antenna is required, and the device becomes large.

Further, when time information in GPS is used, it is effective in a clock device with a built-in GPS, but when it is used for a time correction function of a dedicated clock device, the circuit scale becomes large and cost is increased. It will be high.
Also, a dedicated and relatively large antenna is required.

An object of the present invention is to provide a small-sized and inexpensive timepiece device capable of performing time correction based on time information contained in radio waves.

[0007]

SUMMARY OF THE INVENTION The present invention receives a radio wave transmitted from a CDMA portable telephone and / or a base station for an automobile telephone, and stores GPS-based CDMA system time information superimposed on the radio wave. The time of the clock is corrected based on the time information obtained by demodulation.

Specifically, a built-in clock means, a receiving means for receiving a radio wave transmitted from a base station, a time information demodulating means for demodulating time information contained in the received radio wave, and a time information of the built-in clock means And a time difference measuring means for measuring a time difference based on the time information of the time information demodulating means, and a built-in clock correcting means for correcting a deviation of the time information of the built-in clock means based on the measured time difference information. , The receiving means is configured to receive a radio wave transmitted from a CDMA mobile phone and / or a mobile phone base station, and the time information demodulation means is based on a GPS superimposed on the received radio wave. CDMA system time information is demodulated.

According to such a timepiece device, the time can be corrected in the service area of the CDMA portable telephone and / or the car telephone, and if the population coverage is almost the same as that of the current PDC, 90% can be obtained. The time correction function can be demonstrated in a wide area covering a few percent of the population.

[0010] Further, it is possible to configure many parts using parts common to the CDMA mobile phone.
A Since the price of parts will decrease with the spread of mobile phones,
An inexpensive timepiece device can be configured. In addition, since it is a component for a mobile phone or a car phone, it is a small component. Further, unlike a mobile phone or a car phone, only a receiving-only configuration is sufficient. Will be able to do it.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a timepiece device showing one embodiment of the present invention. The antenna 1 receives a radio wave transmitted from a CDMA mobile phone base station (not shown). What is received here is the signal radio wave of the pilot channel of the CDMA mobile phone, which is down-converted by the high-frequency receiver 2.

The despreading mixer 3 despreads the pilot channel signal by mixing it with a PN source from a local signal generator 5, passes through a digital filter 4, and performs deinterleaving and decoding by a deinterleaver and decoder 6. Become Further, the CDMA sync channel is deinterleaved and decoded by applying a specific WALSH code.

The time data extracting unit 7 extracts and holds system time data from the sync channel signal output from the deinterleaving and decoding unit 6, and the time signal determining unit 8 determines the time (data). To do. This time data is GPS-based time data.

Since the built-in clock section 12 may be located in an environment where radio waves from a CDMA mobile phone base station cannot be received, a clock section using a built-in crystal oscillator is provided. The present time data is displayed on the display unit 13 and output from the measurement time signal generation unit 9 as measurement time data.

The time difference measuring section 10 measures the time difference by comparing the time data obtained by the time signal determining section 8 with the time data for measurement. The correction signal generation unit 11 generates a correction signal based on the time difference, sends the correction signal to the built-in clock unit 12, and corrects time data in the built-in clock unit 12.

The embodiment described above is a clock device that receives a radio wave transmitted from a CDMA mobile phone base station and uses time data superimposed on the radio wave.
A radio wave transmitted from a CDMA mobile phone base station is received and modified to use the time data superimposed on the radio wave, and two radio waves transmitted from the CDMA mobile phone and the mobile phone base station are used. Can be modified to use the time data superimposed on the radio wave upon reception of the radio wave.

[0018]

According to the timepiece apparatus of the present invention, the time can be corrected within the service area of a CDMA mobile phone and / or a car phone, and the time correction function can be exhibited in a wide area. it can.

Also, many parts can be configured using parts common to the CDMA mobile phone, and the CDM
A Since the price of parts will decrease with the spread of mobile phones,
An inexpensive timepiece device can be configured. In addition, since it is a component for a mobile phone or a car phone, it becomes a small component, and further, unlike a mobile phone or a car phone, the configuration of the receiving portion is sufficient, so that the circuit scale is reduced, and it is realized at a small size and at low cost. be able to.

[Brief description of the drawings]

FIG. 1 is a block diagram of a timepiece device according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Antenna, 2 ... High frequency receiver, 3 ... Despread mixer, 4 ... Digital filter, 5 ... Local signal generator, 6 ...
Deinterleaving and decoding unit 7 time data extracting unit 8 time signal determining unit 9 time signal generating unit for measurement
10: time difference measuring section, 11: correction signal generating section, 12: built-in clock section, 13: display section

Claims (2)

[Claims] 1. Built-in clock means, receiving means for receiving a radio wave transmitted from a base station, time information demodulating means for demodulating time information contained in the received radio wave, time information and time information of the built-in clock means A time difference measuring unit that measures a time difference based on the time information of the demodulation unit; and a timepiece device that includes a built-in clock correction unit that corrects a time difference of the built-in clock unit based on the measured time difference information. The receiving means is configured to receive a radio wave transmitted from a CDMA mobile phone and / or a base station for a car phone, and the time information demodulating means is a GPS-based CDMA system superimposed on the received radio wave. A timepiece device configured to demodulate time information. 2. The timepiece device according to claim 1, wherein said time information demodulation means demodulates time data contained in a CDMA sync channel demodulated from a received radio wave.