JPH07167971A - Stopwatch with radio - Google Patents

Abstract

PURPOSE:To enable positive measurement by providing the function of informing the master machine side of the start of measurement from the slave machine side, and constituting a master machine in such a way as to stop the whole measurement at the time of even one slave machine not starting measurement and to prepare itself for another measurement. CONSTITUTION:Eight slave machines to the maximum can be connected to one master machine, and the master machine side and the slave machine side are of the same constitution. The desired radio frequency is demodulated by a receiving part 2 through an antenna 1, and converted into rectangular wave and sent to a control part 3. An informing speaker 7 is connected to the control part 3 so as to perform circuit control, user interface control, and the like. In a transmitting part 4, a transmit high frequency signal from the output stage buffer amplifier of a synthesizer part 5 is amplified by a drive amplifier, power- amplified by a power amplifier and outputted from the antenna 1. The master machine generates alarm sound at the time of not receiving a start input signal from even one slave machine during the action of a timer put in action from the transmission of a start signal, and stops the whole measurement and prepares itself for another measurement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless stopwatch for timing athletics and the like.

[0002]

2. Description of the Related Art In the time measurement of a track competition or the like, a starter of a stopwatch of a measurer is synchronized with a cable from a start point. For this reason, it was necessary to lay cables, and installation and withdrawal became a major issue.

Therefore, it has been considered to wirelessly transmit the start signal.

[0004]

However, in the conventional wireless system, due to noise or the like, one slave can receive and start measurement, but another slave cannot receive and time measurement cannot be performed. However, it was difficult to put into practical use with simple methods and equipment. Therefore, the present invention has a function of notifying the master side that the measurement has started from the slave side,
The purpose of the master unit is to ensure that the measurement is reliably performed by stopping the whole measurement and preparing for the measurement again when the measurement of even one slave unit has not started.

[0005]

A wireless stopwatch of the present invention is a wireless stopwatch comprising a master unit having a transmitting / receiving unit and a slave unit having a transmitting / receiving unit, wherein the slave unit receives a start signal from the master unit. Then, it has a counting means for counting the pulses of a fixed period, a start reception signal transmitting means for transmitting the reception of the start signal to the master unit, and the master unit for operating from the start signal transmission, An alarm means for generating a warning sound and a stop signal transmitting means for transmitting a stop signal for stopping the counting means of the slave unit when the start reception signal transmitting means from the slave unit is not received while the timer means is operating. It is characterized by having.

[0006]

The details of the present invention will be described below with reference to Examples. FIG. 1 is a block diagram of a wireless stopwatch according to the present invention. The wireless stopwatch is set with a master unit and slave units, and up to eight slave units can be connected to one master unit. The master unit side and the slave unit side have the same configuration, and the user selects the master unit / slave unit by the selection switch. A desired radio frequency is demodulated by the receiving unit 2 via the antenna 1, converted into a rectangular wave, and sent to the control unit 3. The control unit 3 is composed of a microcomputer and performs various controls such as circuit control and user interface control. In the transmitting unit 4, the transmission high frequency signal from the output stage buffer amplifier of the synthesizer unit 5 is amplified by the drive amplifier, further power-amplified by the power amplifier, and output from the antenna 1.
A speaker 7 for notification is connected to the control unit 3. The operation unit 6 includes a master / slave selector switch 8 which is a slide switch, a mode switch 9 of a rotary switch having 8 positions, a number setting switch 10 of rotary switches having 8 positions, and a pusher used for time measurement and the like. The measurement switch 11 which is a button switch is connected. The mode switch 9 outputs the binary code with 2 bits. The number setting switch 10 outputs the binary code with 3 bits. The measurement switch 11 connects the START1 switch having a double-click mechanism, the START2 switch, and the SPLIT switch for measuring the split time to the operation unit 6.

FIG. 2 is an external view of a wireless stopwatch according to the present invention. The measurement switch 11 is divided into a START switch 11A (START1 switch and START2 switch having a double-click mechanism) and a SPLIT switch 11B (SPLIT switch for measuring split time). The current time, measurement time, etc. are displayed on the liquid crystal panel 12. The mode switch 9 has four positions: time mode → stopwatch mode → wireless mode → recall mode. In the time mode, power is not supplied to the wireless unit, and the current time (including correction) is always displayed. In stopwatch mode, power is not supplied to the wireless unit, and time can be measured as a single unit. In the wireless mode, power is supplied to the function of the stopwatch mode and the wireless unit, and transmission and reception are performed by the master unit and the slave unit. In the recall mode, it is possible to read the measurement time taken in the stopwatch mode and the wireless mode.

FIG. 3 is a processing flow chart of the master side of the wireless stopwatch of the present invention. In the embodiment, 1 to 8 slave units are connected to the master unit, but here, the maximum 8 units (slave unit 1 to slave unit 8) are connected. As a preparation stage, the number setting switch 10 of the parent device
Is set to the scale of "8" (the number of connected slave units). On the slave side, the number setting switch 10 of the slave 1 is set to "
1 "scale, likewise the cordless handset 2 has" 2 "scale ...
・ Similarly, the cordless handset 8 is adjusted to the scale of "8". When the "master side transmission process" (20), which is the transmission process of the master unit, starts, "START1 is pressed?" (2) which is the standby switch of the start switch having the double-click mechanism?
Proceed to 1) to determine if the vehicle is in the preparation stage for start.
When preparing for the start, "preamble signal transmission" (22) for transmitting a preamble signal to the slave unit is executed. The preamble signal is used in an asynchronous system (a system that does not emit radio waves when it is not needed, such as when there is no call). That is, it is used to reduce power consumption. As the preamble signal, bit synchronization is easy to take and there are many changes "1"
A repeating pattern of "0" is used. Next, when the start switch 11A is further pressed deeply, the START2 switch is turned on. Then, "START2 is pressed?""(23) sends a sync signal"
Send sync signal "(24). This sync signal becomes a start signal for the slave unit. At the same time as executing step 24, a timer that determines the response time to the start signal from the slave unit is started" Timer start " Proceed to (25). This timer time is determined by the set value of the number setting switch 10. When the timer ends is "timer ended? "When judged by (26), next, tell that the start signal (sync signal) has been received from the eight handset units during this timer time." Has any handset a reply? "(27) is determined. When all slaves have replied, the process proceeds to" END "of the end and the transmission process on the master side ends. Even if there is no reception, there is no reply from the slave. At that time, stop measuring the slave unit and return it to the reset state ”
Proceed to "Send stop signal" (28), and then generate "warning sound" (2) that informs the master unit user of the sound again.
9) is executed and the process proceeds to step 30.

FIG. 4 is a processing flow chart of the slave side of the wireless stopwatch of the present invention. Although there are slaves 1 to 8 as slaves, the slave 2 will be described here as a representative. "Slave unit side transmission process" (4)
When entering 0), the process proceeds to "preamble signal detection?" For determining whether the preamble signal from the master unit is received. When the preamble signal is detected, the process proceeds to "sync signal detection" (42) for determining whether the start (sync) signal has been transmitted. When the sync signal is detected, the counting means for counting 100 Hz pulses is started and the "start processing" (43) for notifying the start is executed. This starts the measurement. At the same time, a "timer 1 start" (44) is executed to determine the time to notify the master unit that the counting means has started. The time of the timer 1 is determined by the number setting switch 10, and is the time of "response of the child device 2" as shown in FIG. "Timer 1 finished?" (4
When the timer 1 is terminated by 5), the "handset 2 reply" (4) which transmits that the handset 2 has started the counting means is sent.
Proceed to 6). And "Timer 2 start" (47) that decides the timing to receive the stop signal from the master unit
Proceed to. When the end of the timer 2 is judged by the "timer 2 end?" (48), the reception system is entered and the process proceeds to "stop signal reception" (49). If the stop signal is not received, the process ends and the process proceeds to "END" (52), and the handset device side transmission process ends. When a stop signal is received, "stop and reset processing" (50) for returning the counting means to the stop state and returning to the initial state is executed, and a warning is given to the user of the handset unit by sound to notify that the handset unit has automatically stopped measurement. Sound is generated ”(5
1) is executed, and the process proceeds to step S52 "END" and ends.

FIG. 5 is a timing chart of FIGS. 3 and 4. At the timing of shifting from the master transmission to the slave transmission and the timing of shifting from the slave transmission to the next slave transmission ”
I put "vacant" to prevent the outputs from overlapping.

[0011]

As described above, according to the present invention, the main unit has a function of notifying that the measurement has started from the slave unit side, and the master unit starts measurement even if only one slave unit is used. If it does not exist, the entire measurement is stopped, and the measurement is performed again by preparing for the measurement again.

[Brief description of drawings]

FIG. 1 is a block diagram of a wireless stopwatch of the present invention.

FIG. 2 is an external view of a wireless stopwatch of the present invention.

FIG. 3 is a master unit side transmission processing flowchart of the present invention.

FIG. 4 is a flow chart of a transmission process on the handset side of the present invention.

5 is a main timing diagram of FIGS. 3 and 4. FIG.

[Explanation of symbols]

 1 ... Antenna 2 ... Receiving part 3 ... Control part 4 ... Transmitting part 5 ... Synthesizer part 6 ... Operating part 7 ... Speaker 8 ... Parent / slave switching Switch 9 ... Mode switch 10 ... Unit setting switch 11 ... Measurement switch

Claims (1)

[Claims] 1. A wireless stopwatch comprising a master unit having a transmitting / receiving unit and a slave unit having a transmitting / receiving unit, wherein the slave unit, when receiving a start signal from the master unit, has a counting unit for counting pulses of a constant cycle. , A start reception signal transmitting means for transmitting the reception of the start signal to the master unit, the master unit operating from the start signal transmission, and the start reception signal from the slave unit during the operation of the timer means. A wireless stopwatch having alarm means for generating a warning sound when not receiving from the transmitting means and stop signal transmitting means for transmitting a stop signal for stopping the counting means of the slave unit.