JPH04345330A - mobile radio equipment - Google Patents

Abstract

PURPOSE:To reduce power consumption in the standby state in an automobile telephone set and a portable telephone set operated by a battery. CONSTITUTION:The equipment is provided with a means 10 operating reception systems 2, 4, 8 intermittently in the standby state, a means controlling the period of an intermittent reception operation, and a means 3 detecting an electric field strength at the intermittent reception and when the detected electric field strength is weak, the period of the intermittent reception is extended to reduce power consumption. Or power is supplied only to the circuits 2, 4 relating to the detection of the electric field strength in the standby state to be in operation and when the electric field strength in the standby state is continuously weak over a prescribed period, all power is interrupted and the circuit is restarted by ON operation of the power switch.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile radio device used in a car phone, a mobile phone, etc., and is particularly aimed at reducing power consumption in a standby state.

0002

2. Description of the Related Art A conventional mobile radio device, as shown in FIG. The receiving system includes a demodulation circuit 8 which obtains a baseband signal by the demodulation circuit 8, and a speaker 13 which reproduces the baseband signal obtained by the demodulation circuit 8. An error detection/correction circuit 12 that detects and corrects bit errors; a sequence control circuit 11 that is controlled by the output of this error detection/correction circuit 12 and controls connection with a base station; A control system including a timing control circuit 10 connected to the device and controlling the timing of the entire device,
Further, a modulation circuit 7 to which the audio signal from the microphone 14 and the signal from the error detection/correction circuit 12 are multiplexed and applied.
and a transmitting circuit 5 that converts the output of this modulating circuit 7 into a transmitting frequency and transmits it from an antenna 6.

The apparatus further includes a synthesizer 4 for selecting a receiving frequency and a transmitting frequency, and this synthesizer 4 is controlled by a timing control circuit 10 and supplies a high frequency output to the receiving circuit 2 and the transmitting circuit 5.

The timing control circuit 10 is connected to a reception circuit 2, a demodulation circuit 8, a sequence control circuit 11, an error detection/correction circuit 12, a synthesizer 4, etc. in order to perform intermittent reception operations. , are connected to the locations required for timing control.

Next, the operation of the conventional device configured as described above will be explained. The received signal received by antenna 1 is
In the receiving circuit 2, the output of the synthesizer 4 is used to convert the signal into a signal with a desired frequency and amplitude, and the signal is guided to the demodulating circuit 8, where the baseband signal is reproduced and sent out as audio from the speaker 13.

On the other hand, the digital control signal in the baseband reproduced by the demodulation circuit 8 is transmitted to the error detection/correction circuit 12.
After the error is corrected, the sequence control circuit 11
guided by. This sequence control circuit 11 and demodulation circuit 8
Under the control of the timing control circuit 10, a timing control signal for intermittent reception and communication at a constant period as shown in FIG. 3 is generated.

As shown in FIG. 3, during intermittent reception, the timing control circuit 10 controls the reception circuit 2 and the demodulation circuit 8.
, sequence control circuit 11, error detection/correction circuit 12,
Only the synthesizer 4 is intermittently powered on to receive control signals.

As shown in FIG. 3, during communication, the receiving system is operated continuously, and the audio signal from the microphone 14 and the digital control signal from the error detection/correction circuit 12 are multiplexed and sent to the modulation circuit 7. Modulate the sending carrier wave. This carrier signal is converted into a desired frequency and power in a transmission circuit 5 using the output of a synthesizer 4, and then
It is transmitted from antenna 6.

[0009] Even with the conventional mobile radio device configured in this manner, it is possible to receive control signals intermittently during the standby period, as shown in FIG. 3, and the power consumption of the device can be reduced.

0010

[Problems to be Solved by the Invention] However, with such conventional mobile radio equipment, even when you are outside the service area or in a place where reception is clearly not possible, such as in the basement of a building, There was a problem in that even when the user forgot to turn off the power, intermittent reception was performed and the battery was wasted.

[0011]

[Means for Solving the Problems] Means for intermittently operating a receiving circuit during standby, means for controlling the cycle of this intermittent receiving operation, and means for detecting electric field strength during intermittent reception are provided. , the period of intermittent reception operation is lengthened when the detected electric field strength is weak. In addition, when in standby mode, power is supplied to operate only the circuits related to the detection of electric field strength, or when the electric field strength in standby mode is continuously weak for a predetermined period,
It may be configured such that all power sources are shut off and the system is started by turning on the power switch.

0012

[Operation] During standby, the received electric field strength is detected while the receiving circuit is intermittently operating, and when the detected electric field strength is weak, the period of the intermittent receiving operation is controlled. To reduce power consumption by lengthening the cycle of intermittent reception operations.

Further, when the detected electric field strength is continuously weak for a predetermined period, all power sources can be cut off and the device can be started by turning on the power switch.

[0014]

[Embodiment] As shown in FIG. 1, a receiving circuit 2 converts a signal received by a receiving antenna 1 into a desired frequency and amplitude;
An electric field strength detection circuit 3 that detects the strength of the electric field received by this receiving circuit 2, a demodulating circuit 8 that demodulates the signal converted by the receiving circuit 2 to obtain a baseband signal, and a baseband signal obtained by this demodulating circuit 8. Speaker 1 that plays the band's audio signal
3, an error detection/correction circuit 12 for correcting bit errors in the digital control signal in the baseband obtained by the demodulation circuit 8;
2, and a timing control circuit 10 connected to the sequence control circuit 11 and controlling the timing of the entire device; , a modulation circuit 7 to which the audio signal from the microphone 14 and the signal from the error detection/correction circuit 12 are multiplexed and applied, and a transmission circuit to convert the output of the modulation circuit 7 into a transmission frequency and transmit it from the antenna 6. 5 and a transmission system consisting of.

A synthesizer 4 for selecting a receiving frequency and a transmitting frequency is provided, and this synthesizer 4 is controlled by a timing control circuit 10 and supplies a high frequency output to the receiving circuit 2 and the transmitting circuit 5.

Furthermore, an AND circuit 9 is provided to obtain a logical product between the detection output of the electric field strength detection circuit 3 and the output of the timing control circuit 10.
, a sequence control circuit 11, and an error detection/correction circuit 12.

Next, the operation of the apparatus of the embodiment configured as described above will be explained. The received signal received by the antenna 1 is converted into a signal with a desired frequency and amplitude in the receiving circuit 2 using the output of the synthesizer 4, and guided to the demodulating circuit 8, where the baseband signal is regenerated. The sound is emitted from the speaker 13 as sound.

On the other hand, the digital control signal reproduced by the demodulation circuit 8 undergoes error correction in the error detection/correction circuit 12 and is then led to the sequence control circuit 11 . Under the control of the sequence control circuit 11 and the demodulation circuit 8, the timing control circuit 10 generates timing control signals for intermittent reception and communication at a constant period as shown in FIG.

During the intermittent reception shown in FIG. 3, the timing control circuit 10 directly and intermittently powers on the receiving circuit 2 and the synthesizer 4, and turns on the demodulating circuit 8, the sequence control circuit 11, and the error detection/correction circuit 12. The power is intermittently turned on via the AND circuit 9 to receive control signals.

In the electric field strength detection circuit 3, the receiving circuit 2
The electric field strength during intermittent reception is detected from the output signal. This detection signal includes (1) a signal at each moment during intermittent reception, and (2) a signal when detected continuously.
The following four processes are performed depending on the seed signal.

(1) When the electric field strength detection circuit 3 detects that the electric field strength during intermittent reception is continuously weak for a predetermined period, this detection signal is sent to the timing control circuit 10 to perform the intermittent reception operation. lengthen the cycle. (2) When the electric field strength at each instant during intermittent reception is weak, the power to the error detection/correction circuit 12, sequence control circuit 11, and demodulation circuit 8 during intermittent reception is cut off. (3) Perform the operations (1) and (2) above simultaneously. (4) Without performing any of the processes in (1) to (3) above,
If the electric field strength during intermittent reception is continuously weak, all power supplies are temporarily cut off and restarted by turning on the power switch.

[0022]

Effects of the Invention As is clear from the explanation based on the above embodiments, according to the present invention, (1) when it is detected that the electric field strength during intermittent reception is continuously weak, the period of intermittent reception is lengthened. (2) When the electric field strength at each instant during intermittent reception is weak, the power to the error detection/correction circuit 12, sequence control circuit 11, and demodulation circuit 8 during intermittent reception is cut off. Therefore, power consumption can be further reduced.

(3) If the electric field strength during intermittent reception is continuously weak, all power supplies are cut off and restarted by turning on the power switch. It is possible to achieve excellent effects such as preventing wastage of battery power when the power is forgotten to be turned off.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a mobile radio device of the present invention;

FIG. 2 is a block diagram showing an example of a conventional mobile radio device;

FIG. 3 is a timing chart used to explain the operation of a conventional mobile wireless device.

[Explanation of symbols]

2 Receiving circuit 3 Electric field strength detection circuit 4 Synthesizer 5 Transmission circuit 7 Modulation circuit 8 Demodulation circuit 9 AND circuit 10 Timing control circuit 11 Sequence control circuit 12 Error detection/correction circuit 13 Speaker 14. Microphone

Claims (4)

[Claims] 1. A device comprising: means for intermittently operating a receiving circuit during standby; means for controlling a cycle of the intermittent receiving operation; and means for detecting electric field strength during the intermittent receiving. A mobile radio device characterized in that the period is lengthened when the electric field strength is weak. 2. The mobile radio device according to claim 1, wherein during standby, power is supplied to only circuits related to detection of electric field strength to operate them. 3. The mobile radio device according to claim 1, wherein the period of intermittent reception operation is lengthened when the electric field strength in the standby state is continuously weak for a predetermined period. 4. The mobile radio according to claim 1, wherein when the electric field strength in the standby state is continuously weak for a predetermined period, all power sources are cut off and the mobile radio is activated by operating a power switch. Device.