JPH09275372A - Portable communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid inconvenience from being imposed onto the user by using a control signal stored in a storage section just before the occurrence of momentary interruption and to correct deviation caused in a radio section after the momentary interruption so as to execute the control thereby quickening locking and reducing a recovery time after the momentary interruption such as intermission of a speech. SOLUTION: An AFC control voltage storage section 14 always receives an AFC control voltage from an AFC control voltage generating section 13 to keep a voltage when AFC control is implemented. When power is interrupted momentarily due to any cause, a momentary interruption discrimination section 10 discriminates power interruption and its restoration. When the period between the power interruption and the restoration is short, it is discriminated to be occurrence of momentary interruption. After the restoration from the momentary interruption, a control section 7 discriminates the discrimination of momentary interruption and reads data in a PLL setting section 8 and other set data from an S-RAM 9 to restore the state to a state just before the occurrence of the momentary interruption and uses a voltage stored in a storage section 14 as an initial value of the generating section 13. Thus, the AFC is started with an AFC control voltage used before the occurrence of momentary interruption after the restoration from the momentary interruption and then the communication equipment reaches a stable state immediately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable communication device which is driven by being supplied with power and which corresponds to a case where the power supply is momentarily cut off.

[0002]

2. Description of the Related Art Generally, PHS (personal handy phone)
system) and PDC (personal digital cellular phone sy)
stem) digital mobile phones such as digital wireless phones and analog wireless phones, and receive wireless communication.
Alternatively, in a portable communication device represented by an information terminal device for transmitting, a primary battery or a secondary battery is attached for power supply.

The battery must be removed for replacement,
It is removable. Therefore, the main body and its battery part are connected to mechanical connection terminals.

Therefore, the contact state may be momentarily changed due to some shock, and the power supply from the battery may be cut off. Naturally, each electric part of the main body stops its operation when the power supply is dropped, so that if a call is in progress, the call may suddenly be cut off and the power may be turned off. Therefore, there are some that incorporate measures against instantaneous interruption to restore the original state even if an instantaneous interruption occurs.

That is, in such a portable communication device, the interruption time is usually several hundreds [ms] or less, and the interruption can be determined by a simple circuit (for example, RC circuit). With this momentary interruption, all devices (circuits) are reset, and initialization is performed when the power is turned on. Therefore, by this determination, the power is turned on and initialization is performed without determining whether the power is turned on.

However, even in this case, inconvenience cannot be solved during a call. In other words, the call may be interrupted due to a momentary interruption and the call may not be resumed because the initialization operation is performed after the power is turned on.

Therefore, a method of solving the problem in the conventional circuit block shown in FIG. 3 will be described. Here, the PDC method will be described as an example.

In this figure, a radio signal is transmitted and received by an antenna 1, and a radio section 2 for modulating / demodulating a signal required for transmission / reception is a TDMA (Time Division Multiplex Ac
cess) processing and other digital modulation / demodulation processing.

The digital processing section 3 outputs a voice to the speaker 5 and is connected to a voice processing section 4 for inputting a voice from a microphone.

The radio section 2 communicates with the frequency set by the PLL setting section 8 under the control of the control section 7 every time communication is performed.

The control unit 7 is connected to the digital processing unit 3, controls digital processing, and detects the state thereof.
The S-RAM (static RAM) 9 is a memory for storing data necessary for each circuit, and the power supply voltage is supplied also from the backup unit 11.

In these mobile phones (especially digital mobile phones), the basic frequency transmitted by local transmission may shift due to changes in the environment (temperature, etc.), communication conditions, and power supply voltage. AFC to compensate for
(Automatic freqeuncy control) means.
When the local oscillation frequency deviates due to the above reason, the AFC means detects the deviation by the frequency deviation detection unit 12, and based on the detection result, generates a control voltage for shifting the frequency in the direction of eliminating the deviation. AFC control voltage generator 13
To the wireless unit 2.

As a result, the deviation of local transmission can be compensated.

Next, the countermeasure against the problem of instantaneous interruption will be described. This momentary interruption is discriminated by the momentary interruption discriminating unit 10, and the control unit 7 discriminates this discrimination, and the PL from the S-RAM 9 is determined.
By reading the data of the L setting unit 8 and other set data, the state immediately before the instantaneous interruption occurs is restored. As a result, it is taken as a measure against instantaneous interruption.

However, the AFC control unit 12 is reset by an instantaneous interruption like the other circuits, but since the previous value is not held, the voltage is restored and the same as when the power is turned on. AF from initial value (usually center value)
C control is performed. Therefore, like the power-on, the pull-in from the initial value by the control of the AFC becomes several hundreds [ms], and if the influence of fading is taken into consideration, it may take several [s] before it becomes stable.

Therefore, if the time until stabilization is not resolved, it is conceivable that the call cannot be restored to the call channel due to a momentary interruption during the call, and the call may be interrupted. that is,
If you interrupt for more than a predetermined time during a call that is a PDC standard,
The call is terminated because it is considered out of sync.

[0017]

That is, according to the present invention,
As described above, it is an object of the present invention to provide a configuration that solves the problem that a telephone call ends due to the influence of AFC at the time of a momentary interruption, which is inconvenient for the user.

[0018]

SUMMARY OF THE INVENTION The present invention is a portable communication device that is portable and capable of communication, and that includes power supply means for supplying voltage to various circuits, in order to perform communication in a predetermined communication band. And a deviation detecting means for detecting a deviation between the frequency and the frequency of the received signal from the wireless means, and a wireless means for eliminating the deviation. Control means for supplying a control signal to the means, control storage means for storing the control signal at every predetermined time, and connected to the control storage means so that power can be supplied for a certain period of time even if the supply of the power supply means is interrupted A sub power supply means, and when the supply of the power supply means is interrupted, a momentary interruption determining means for determining whether or not the interruption of the supply is instantaneous,
When the judgment of the momentary interruption determination means determines that the momentary interruption occurs, the control signal stored in the control storage means immediately before the momentary interruption is used when the momentary interruption is recovered. A communication device is provided.

[0019]

1 is a circuit block diagram of an embodiment of the present invention. The same portions as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 14 denotes an AFC control voltage storage unit that constantly monitors the AFC control voltage output from the AFC control voltage generation unit 13 and stores it. The storage unit 14 is connected to the backup unit 11 and the instantaneous interruption determination unit 10.

Next, the present invention will be described with reference to this drawing.

At normal times, the AFC control voltage generator 13 always receives the AFC control voltage from the AFC control voltage generator 13 and stores it. The AFC control voltage storage 14 stores the voltage when the AFC control is applied. This holding is performed by the voltage supplied from the backup unit 11 which is a capacitor or the like and can hold the voltage so that it can be held even during a momentary interruption. At this time, AFC
The control voltage is stored as analog or digital.

Thereafter, as described above, when the power supply is momentarily shut off due to some situation, the power interruption / recovery is discriminated by the momentary interruption discrimination unit 10. Depending on the disconnection period, if it is short, it is determined to be an instantaneous disconnection. And after the recovery from the interruption
The control unit 7 determines that this determination has been made, and the S-RAM
By reading the data of the PLL setting unit 8 and other set data from 9, the state immediately before the occurrence of the instantaneous interruption is restored, and the voltage held in the AFC control voltage storage unit 14 is stored in the AFC control voltage generation unit 13. Let it be the initial value.

As a result, AF after the instantaneous interruption recovery and before the instantaneous interruption
When the AFC is started with the C control voltage, a stable state is immediately obtained as compared with when the AFC control is started from the initial value.

On the other hand, if the power-off time is longer than the predetermined period (time), it is determined that the power supply voltage is not cut off instantaneously but is cut off, and after the recovery, each circuit is activated with all the initial data. In other words, reset and start up. When it is determined that the power supply voltage is cut off, the AFC control voltage storage unit 14 is reset by the cutoff output from the instantaneous interruption determination unit 10, and the AFC control voltage storage unit 14 is reset.
The control voltage generator 13 is reset to output the initial value.

As another method, the AFC control voltage storage unit 14 always stores the deviation data indicating how much the deviation from the initial value, and the data is AFC when the power supply voltage is interrupted. By adding to the value initially set by the control voltage generator 13, restarting can be performed quickly. On the contrary, when the power supply voltage is cut off, the data is reset to zero and added to the value initially set in the AFC control voltage generator 13. In other words, the value of the initial value does not change even if zero is added to the initial value, so that the value will rise to the initial value after restoration.

Therefore, when an interruption occurs in the power supply, the AFC can be pulled in at a higher speed than at the time of normal reset.

Next, the operation during a specific call will be described. When the instantaneous interruption determination unit 10 determines the instantaneous interruption of the power supply, the control unit 7 outputs the wireless unit 2 to the channel immediately before the instantaneous interruption by the output of the PLL unit 8 based on the information held in the S-RAM 9. Set. Further, the digital processing unit 3 sets the slot number and the rate (full / half) of the TDMA process to the values stored immediately before the momentary interruption. In addition, the operation mode is set to resynchronization mode, and the interruption of the call is regarded as out of synchronization (according to the resynchronization sequence of the RCR STD-27D standard), and the original call is restored within 5 seconds on condition that the synchronization is acquired. Is possible.

Therefore, by using the AFC control voltage storage unit 14, the time required for frequency synchronization can be shortened and the call can be restored.

FIG. 2 is a flow chart of the present invention.
It shows how the AFC control voltage is set by a momentary interruption of the power supply voltage.

First, in step S1, the AFC voltage generated in the AFC control voltage generator 13 is held in the AFC control voltage memory 14. Step S2 is a branch for determining whether or not the power supply voltage is cut off. If the power supply voltage is not cut off, the process returns to step S1. On the other hand, when the power supply voltage is cut off, the process proceeds to step S3, the period until the power supply is restored is counted, and it is a step of determining whether there is a momentary interruption or interruption in the period until the power is restored. This is repeated until the power is restored. When returning, depending on the period, for example, 5
If it is within [S], it is determined that the power supply is instantaneously cut off, and if it is more than that, it is considered that the power supply is cut off.

When it is determined that the power is interrupted, the process proceeds to step S4, and the AFC control voltage stored in the AFC control voltage storage unit 14 immediately before the power failure is supplied to the AFC control voltage generator 13.
Control goes to step S6. On the other hand, if it is determined that the interruption is not the instantaneous interruption, the process proceeds to step S5, and the AF is performed immediately before the instantaneous interruption.
Regardless of the AFC control voltage stored in the C control voltage storage unit 14, the initial value is supplied to the AFC control voltage generation unit 13,
Control goes to step S6.

In step S6, A based on the data sent from the storage unit 14 to the AFC control voltage generation unit 13 is used.
AFC control is started with the FC control voltage, and the process returns to step S1.

Therefore, if the time until stabilization is not resolved, it is conceivable that the call cannot be restored to the call channel due to a momentary interruption during the call, and the call may be interrupted. that is,
If you interrupt for more than a predetermined time during a call that is a PDC standard,
The call is terminated because it is considered out of sync.

As a result, depending on the period during which the power supply is cut off,
If you can decide whether or not to reset, and if it is judged as a momentary interruption, A
Since the FC control voltage starts with the data immediately before the momentary interruption, a quick restart is performed and it does not take much time to stabilize the AFC.

In the description of the present invention, the AFC control voltage is constantly monitored and stored, but the stored AFC control voltage is compared with the current AFC control voltage,
It can also be realized by a method of storing the current AFC control voltage when it changes significantly. According to this, although a means for comparing and determining is required separately, rewriting of the storage unit is reduced, and in particular, since almost no change in AFC is observed in a stable state, it is effective in that case.

[0037]

According to the present invention, a control signal for correcting the deviation of the wireless unit stored in the storage unit immediately before the interruption is used after the interruption and the control is performed. It is possible to speed up the pulling in by using the value immediately before the momentary interruption without starting from the value. Thereby,
Since the time after a momentary interruption such as interruption of a call is shortened, it does not cause any inconvenience to the user.

Further, even if the resynchronization process (sequence) is performed, it is possible to return to the call state without ending the call due to a failure.

Further, since the pull-in is fast, stable communication can be performed immediately.

[Brief description of drawings]

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

FIG. 2 is a flowchart char diagram in one embodiment of the present invention.

FIG. 3 is a circuit block diagram of a conventional example.

[Explanation of symbols]

 1 antenna 2 radio part 3 digital processing part 4 audio processing part 5 audio output part 6 audio input part 7 control part 8 PLL setting part 9 S-RAM 10 instantaneous interruption determination part 11 backup part 12 frequency deviation detection part 13 AFC control voltage generation Section 14 AFC control voltage storage section

Claims (3)

[Claims] 1. A portable communication device that is portable and capable of communication, and that includes power supply means for supplying voltage to various circuits, determines a frequency for performing communication in a predetermined communication band, and performs high frequency communication. Control means for supplying the frequency to the wireless means, deviation detection means for detecting a deviation between the frequency and the received frequency from the wireless means, and control for supplying a control signal to the wireless means so as to eliminate the deviation. Generating means; control storage means for storing the control signal at predetermined time intervals; sub-power supply means connected to the control storage means and capable of supplying power for a certain period of time even if the power supply means stops supplying power; When the supply of the power supply means is interrupted, the interruption determination means determines whether or not the interruption of the supply is instantaneous, and the determination of the interruption determination means is an instantaneous interruption. When it is determined that the portable communication device, characterized by utilizing the control signal stored in said control storage means said control signal when the instantaneous return to interruption immediately before. 2. The portable communication device according to claim 1, wherein the control storage means stores the predetermined time as zero and always stores it. 3. The control storage means is provided with means for comparing the present control signal with the stored control signal, and the control storage means stores the control signal only when the difference is a predetermined amount. The portable communication device according to claim 1 or 2.