JPH06284064A - Mobile radio communication equipment - Google Patents

Abstract

PURPOSE:To obtain a mobile radio communication equipment capable of informing a drop in the radio receiving sensitivity level of a radio signal to a user for the communication equipment itself and reducing a rasping voice noise generated when the sensitivity level is reduced. CONSTITUTION:The radio receiving sensitivity level of a radio signal received by a radio part 1 is detected by a radio receiving sensitivity level detecting circuit 4. When the sensitivity level is reduced less than a previously set prescribed value, a control part 5 controls a display device 7 to display the level reduction on the display 7 and controls a voice output band switching part 31 so that a voice output band outputted from a voice reproducing circuit 3 is narrowed as compared with a normal voice output band.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile radio communication device for receiving a radio signal transmitted via a radio line and outputting a voice signal corresponding to the radio signal, and more particularly to a radio reception of the received radio signal. The present invention relates to a mobile radio communication device configured to notify a user when a sensitivity level falls below a predetermined value and to narrow an output band of an audio signal to reduce annoying audio noise.

[0002]

2. Description of the Related Art Generally, in a mobile radio communication device,
The radio reception sensitivity (RSSI) level of the received radio signal changes depending on the distance from the base station of the mobile radio communication device and the position and direction of the mobile radio communication device.

By the way, there is known a conventional mobile radio communication device configured to automatically disconnect the radio line when the radio reception sensitivity level of a received radio signal falls below a preset predetermined value. There is.

However, in the case of this configuration, the wireless line is suddenly disconnected without any notification, and the user of the mobile wireless communication device cannot know why the wireless line is disconnected, which is extremely high. It's inconvenient.

Further, when the radio reception sensitivity level of the received radio signal is lowered, a radio transmission error easily occurs,
When a wireless transmission error occurs, annoying audio noise is mixed into the audio signal corresponding to the received wireless signal.

[0006]

As described above, in the conventional apparatus, when the radio reception sensitivity level of the received radio signal becomes less than the preset predetermined value, the radio line is suddenly disconnected without any notification. When the wireless reception sensitivity level of the received wireless signal is lowered, a wireless transmission error is likely to occur, which causes an inconvenience that annoying audio noise is mixed into the audio signal corresponding to the received wireless signal.

Therefore, according to the present invention, it is possible to notify the user of the mobile radio communication device of a decrease in the radio reception sensitivity level of a radio signal and to reduce annoying voice noise generated when the radio reception sensitivity level is decreased. It is an object of the present invention to provide a mobile wireless communication device according to the above.

[0008]

In order to achieve the above object, the present invention provides a mobile radio communication device which receives a radio signal transmitted via a radio line and outputs a voice signal corresponding to the radio signal. A radio receiving sensitivity detecting means for detecting a radio receiving sensitivity level of the radio signal, and a display means for displaying the radio receiving sensitivity level detected by the radio receiving sensitivity detecting means when the radio receiving sensitivity level drops below a predetermined value. It is characterized by having done.

[0009]

According to the present invention, when the wireless reception sensitivity level detected by the wireless reception sensitivity detecting means falls below a predetermined value, the fact is displayed by the display means.

Thus, the user of the mobile radio communication device can know that the radio reception sensitivity level has decreased by looking at the display of the display means, and the cause of the decrease in the radio reception sensitivity level is the mobile radio communication device. When it is in the position or direction, the position or direction of the mobile radio communication device can be adjusted to the optimum position or direction by looking at the display of the display means. Furthermore, even when the mobile radio communication device is in the vicinity of the out of communication range, You can know this by the display.

Further, when the radio reception sensitivity level detected by the radio reception sensitivity detecting means is lowered to a predetermined value or less by the voice output band switching means, the output band of the voice signal is switched so as to be narrowed to thereby obtain the radio reception sensitivity. It is possible to reduce annoying voice noise that occurs when the level decreases.

[0012]

Embodiments of a mobile radio communication device according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the overall configuration of an embodiment of the mobile radio communication apparatus of the present invention.

In FIG. 1, the mobile radio communication apparatus of this embodiment has an antenna 6 for receiving a radio signal from a base station (not shown) and a radio reception sensitivity (RSSI) signal for receiving the radio signal from the antenna 6. A wireless unit 1 that outputs a received signal, a signal processing unit 2 that performs processing such as demodulation of the received signal output from the wireless unit 1, and digital audio output data output from the signal processing unit 2 is converted into analog audio. At the same time, the audio reproduction circuit 3 having the audio output band switching unit 31 for switching the audio output band, and the RS from the wireless unit 1
The signals from the wireless reception sensitivity level detection circuit 4, which detects the wireless reception sensitivity (RSSI) level of the wireless signal received by the wireless unit 1 based on the SI signal, the display 7, and the signal from the wireless reception sensitivity level detection circuit 4. Based on this, the fact that the wireless reception sensitivity level has dropped to a predetermined value or less is displayed on the display 7 and the audio output band switching section 31 of the audio reproduction circuit 3 is controlled to output the audio output from the audio reproduction circuit 3. It is composed of a control unit 5 that controls the level and controls the entire device.

FIG. 2 is a flow chart showing an operation in which a portion related to the present invention is extracted from the operation of the control unit 5 shown in FIG.

Next, the operation of this embodiment will be described with reference to the flow chart shown in FIG.

First, a radio signal transmitted from a base station (not shown) of this mobile radio communication device is received by a radio unit 1 via an antenna 6 and is voiced via a signal processing unit 2 which performs signal processing such as demodulation. It is supplied to the reproducing circuit 3. At the same time, the RSSI signal output from the wireless unit 1 is added to the wireless reception sensitivity level detection circuit 4, where the wireless reception sensitivity level of the wireless signal received by the wireless unit 1 is detected, and the detected wireless reception sensitivity level is detected. Is sent to the control unit 5.

The control unit 5 first determines the wireless reception sensitivity level of the wireless signal received by the wireless unit 1 based on the output of the wireless reception sensitivity level detection circuit 4 (step 101).
Subsequently, it is determined whether or not the determined wireless reception sensitivity level is equal to or lower than a predetermined value (step 102). If it is determined that the wireless reception sensitivity level exceeds the predetermined value, the voice reproduction circuit 3 The audio output band switching unit 31 is controlled to switch the audio output band switching unit 31 to select the normal audio output band (step 105), and the audio reproduction circuit 3 generates the audio output in the normal audio output band. .

However, if it is determined in step 102 that the wireless reception sensitivity level is equal to or lower than the predetermined value, first,
The display unit 7 is controlled to display on the display unit 7 that the wireless reception sensitivity level has decreased (step 103), and subsequently, the audio output band switching unit 31 of the audio reproduction circuit 3 is controlled to output the audio output band switching unit. 31 is switched so as to select an audio output band narrower than the normal audio output band (step 104),
The audio reproduction circuit 3 generates an audio output in an audio output band narrower than the normal audio output band.

As described above, in this embodiment, the radio reception sensitivity level of the received radio signal is detected, and when the detected radio reception sensitivity level becomes equal to or lower than the predetermined value, the display 7 displays this fact and outputs the voice. Switch the band so that it is narrower than the normal audio output band.

This makes it possible to reliably notify the user of the mobile radio communication device of the decrease in the radio reception sensitivity level.

Further, even when the wireless reception sensitivity level is lowered and a wireless transmission error occurs, it is possible to reduce annoying voice noise due to the wireless transmission error.

Further, the user of the mobile radio communication device moves the position and direction of the mobile radio communication device in a direction of increasing the radio reception sensitivity level while looking at the display of the display unit 7 to obtain an optimum reception state. It is possible to use mobile radio communication devices.

Further, the user of the mobile radio communication device can grasp the situation by the display of the display device 7 when it is used near the outside of the communication area.

Further, since the user of the mobile radio communication device can know the decrease in the radio reception sensitivity level from the display on the display 7, the radio line will not be disconnected without the user's knowledge.

[0026]

As described above, according to the present invention,
When the wireless reception sensitivity level detected by the wireless reception sensitivity detecting means is reduced to a predetermined value or less, this fact is displayed by the display means. Therefore, 1) the user of the mobile wireless communication device displays the display on the display means. It is possible to know that the wireless reception sensitivity level has dropped by looking at the position of the mobile wireless communication device or the direction of the mobile wireless communication device. The position or direction can be adjusted to the optimum position or direction. 3) Even when the mobile radio communication device is out of the communication range, it is possible to know this by the display of the display means, and the voice output band switching is performed. By means
When the wireless reception sensitivity level detected by the wireless reception sensitivity detecting means falls below a predetermined value, the output band of the audio signal is switched so as to be narrowed. It also has the effect of reducing audio noise.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a mobile radio communication device according to the present invention.

FIG. 2 is a flowchart showing the operation of the apparatus shown in FIG.

[Explanation of symbols]

 1 wireless unit 2 signal processing unit 3 audio reproduction circuit 4 wireless reception sensitivity level detection circuit 5 control unit 6 antenna 7 display unit 31 audio output band switching unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryutaro Imada 1-share company, Toshiba Hino Factory, 3-chome, Asahigaoka, Hino City, Tokyo

Claims (2)

[Claims] 1. A mobile radio communication device for receiving a radio signal transmitted via a radio line and outputting a voice signal corresponding to the radio signal, the radio reception sensitivity detecting a radio reception sensitivity level of the radio signal. A mobile radio communication device comprising: a detection means and a display means for displaying a radio reception sensitivity level detected by the radio reception sensitivity detection means when the radio reception sensitivity level falls below a predetermined value. 2. An audio output band switching unit for switching to narrow the output band of the audio signal when the wireless reception sensitivity level detected by the wireless reception sensitivity detecting unit falls below a predetermined value. The mobile wireless communication device according to claim 1.