JP4594401B2 - Voice mobile communication device - Google Patents

Description

  The present invention relates to a voice mobile communication device equipped with a voice communication function.

In a mobile communication system, the quality of voice communication is affected by the radio wave propagation environment between the fixedly installed base station and the mobile station moving freely in the area, such as a mobile phone, and the mechanism of the mobile communication system. Arise.
As a cause of the deterioration of the voice quality depending on the radio wave propagation environment between the base station and the mobile station, for example, there are fading and shadowing.
Fading is mainly due to the so-called multipath effect in which the radio wave radiated from the antenna on the transmitting side is reflected on various buildings and fixtures, etc., and reaches the receiving side through different paths. This is a phenomenon in which the received power level becomes unstable due to a large fluctuation such as a drop.

In addition, shadowing is a phenomenon in which the reception power level drops suddenly when the transmitter side and the receiver side (base station and mobile station) are shielded by a building or the like.
Due to the radio wave propagation environment in which fading, shadowing, etc. occur as described above, in the communication between the mobile station and the base station, the received power level with respect to the transmission signal from one of the two stations is not constant in time and fluctuates strongly. Show fluctuations.
In particular, since voice communication is continuous in time, if the reception power level falls below a certain level and the low level that cannot be maintained continues, the voice will be interrupted and the quality of voice communication will deteriorate significantly. To do.

In general, various techniques for maintaining communication quality even in an environment where the received power level takes various values have been proposed (see, for example, Patent Document 1).
The proposal of Patent Document 1 detects and records m paths with a large received power level, among which m centroids of multipath distributions are obtained by a predetermined calculation, and effective paths are distributed based on this. The path search is performed accurately over the range, and high reception quality is stably obtained.

On the other hand, handover is an example of a quality deterioration factor of voice communication resulting from the mechanism of the mobile communication system.
Usually, in a mobile communication system such as a mobile phone, the area covered by one base station is limited, and a plurality of base stations are arranged to cover a wider area.
Therefore, when a mobile station communicates and moves across an area from an area covered by one base station to an area covered by another base station, the mobile communication related to the mobile station It is necessary to change the base station that covers

  The above-described base station reconnection operation is called handover. Usually, in a handover, the mobile station always measures the communication quality such as the received power between the communication partner and the neighboring base station and the mobile station, and when the communication quality falls below a certain threshold, the mobile station Information is notified, information on the base station to be communicated next is notified from the communicating base station, and the mobile station switches communication to the base station to communicate next, thereby realizing handover.

At the time of handover, in particular in the type of handover called hard handover in which the communication with the base station with which communication is performed once is disconnected and the procedure for connection to the base station to be connected next is followed, If the procedure for connecting to the base station takes a long time, the voice is interrupted and the voice communication quality is deteriorated.
In particular, when the communication method between two base stations is different, processing such as passing data from the first base station to the next base station to be connected is required, and it takes time compared to handover between the same communication systems. There are many.

Incidentally, various techniques for maintaining communication quality when hard handover is performed have been proposed. For example, a hard handover method in a mobile communication system capable of realizing stable communication immediately after handover between different frequency cells is realized. There is also a proposal to try (see, for example, Patent Document 2).
There is also a proposal to shorten the instantaneous interruption time that occurs at the time of hard handover (see, for example, Patent Document 3).
On the other hand, in the field of speech recognition technology, a technology for adjusting the time axis to deal with speech degradation has also been proposed (see, for example, Patent Document 4).

JP 2002-141833 (summary etc.) JP 2007-259238 A (summary etc.) JP 2007-129591 A (summary etc.) JP-A-8-292789 (summary etc.)

As described above, various techniques for maintaining the communication quality when the received power level fluctuates or hard handover is performed have already been proposed.
However, in reality, it is extremely difficult to prevent any interruption of voice during communication under any circumstances.
That is, ideally, it is desirable that no voice interruption occurs during communication, but it is already common sense that it is actually difficult to achieve such completeness for mobile communication. Yes.

On the other hand, from the viewpoint of a general user who makes a voice call using mobile communication, rather than expecting the technical integrity as described above, the voice break is clearly experienced, or If the risk of discomfort or mistaken hearing due to such interruptions is reduced, it is usual that a certain degree of satisfaction is obtained.
However, for example, the conventional techniques such as those described in the above-mentioned patent document publications advocate a technique that causes almost no interruption of voice during communication, regardless of whether or not the actual achievement is successful. However, there is no viewpoint in providing a realistic technique that a general user wants in a scene where it is actually used.
The present invention has been made in view of such a situation, and the voice movement in which the interruption of the voice is clearly experienced, and further, the possibility of causing discomfort or mistaken hearing due to such interruption is reduced. An object is to provide a communication device.

In order to solve the above-described problems, the present application proposes the following techniques.
The voice mobile communication device according to claim 1 of the present invention is:
A handover instruction detecting means for detecting presence / absence of a handover instruction for the own apparatus; a speech speed converting means for performing a speech speed conversion process related to voice communication performed through the own apparatus; and the speech according to a detection result of the handover instruction detecting means. Speech speed conversion processing control means for controlling the operation of the speed conversion means.

In the voice mobile communication apparatus according to the first aspect, the handover instruction detecting means detects the presence or absence of a handover instruction for the voice mobile communication apparatus which is the own apparatus.
On the other hand, the speech speed conversion means performs speech speed conversion processing related to voice communication performed through the device.
The speech speed conversion processing control means controls the operation of the speech speed conversion means according to the detection result of the handover instruction detection means.
As described above, it is difficult for the voice interruption due to the handover to be experienced, and the possibility of causing discomfort or a mistake in hearing due to such interruption is reduced.

The voice mobile communication device according to claim 2 of the present invention is:
2. The voice mobile communication apparatus according to claim 1, wherein said speech speed conversion processing control means is a speech whose speech speed is slower than said speech speed conversion means when said handover instruction detecting means detects a handover instruction. Control is performed so as to perform a speed conversion operation.
In the voice mobile communication apparatus according to claim 2, when the handover instruction detecting unit detects a handover instruction, the speech speed conversion processing control unit is configured so that the speech speed is reduced with respect to the speech speed converting unit. As a result of the conversion, when the voice is transmitted at a normal speech speed, the voice breaks that can be experienced are lost.

The voice mobile communication device according to claim 3 of the present invention is:
Handover status monitoring means for monitoring the execution status of handover in the own apparatus, reception quality measuring means for measuring reception quality related to voice communication performed through the own apparatus, and reception quality measured by the reception quality measuring means is a predetermined value Reception state determination means for determining whether or not the level is maintained; speech speed conversion means for performing speech speed conversion processing related to the voice communication; handover status recognized by the handover status monitoring means; and the reception status A speech speed conversion processing control means for controlling the operation of the speech speed conversion means according to a determination result by the determination means, wherein the speech speed conversion processing control means continues the speech speed conversion processing by the speech speed conversion means. When the handover status monitoring means recognizes the execution of the handover, the handover status monitoring means Over up server end is recognized, and controls so as to sustain the determination result to depend not speech speed conversion processing by the reception state determining means.
In the voice mobile communication device according to the third aspect, the handover status monitoring means monitors the execution status of the handover in the own device.
The reception quality measuring means measures the communication quality related to the voice communication performed through the voice mobile communication device which is the own device.
The reception state determination means determines whether or not the reception quality measured by the reception quality measurement means maintains a predetermined level.
On the other hand, the speech speed conversion means performs speech speed conversion processing related to voice communication performed through the device.
The speech speed conversion processing control means controls the operation of the speech speed conversion means in accordance with the handover status recognized by the handover status monitoring means and the determination result by the reception status determination means. In this case, the speech speed conversion processing control means, when the handover status monitoring means recognizes execution of the handover while the speech speed conversion means continues the speech speed conversion processing, the handover status monitoring means ends the handover. Until the speech rate conversion process is continued, regardless of the determination result by the reception state determination means.

As described above , even if the reception quality is maintained at a predetermined level, when handover occurs, it is possible to preferentially cope with the deterioration of the reception quality and to maintain the speech speed conversion process, thereby avoiding voice interruption.

  According to the present invention, it is possible to realize a voice mobile communication apparatus in which a voice break is clearly experienced, and further, the possibility of causing discomfort or a mistake in hearing due to such a break is reduced.

Hereinafter, the present invention will be clarified by describing embodiments of the present invention in detail with reference to the drawings.
(Configuration of Voice Mobile Communication Device as First Embodiment of the Present Invention)
FIG. 1 is a functional block diagram showing the configuration of a voice mobile communication apparatus as a first embodiment of the present invention.
In FIG. 1, a voice mobile communication apparatus (mobile station) 100 has a system controller 101 that manages the entire system in an integrated manner. Under this system, an RF transmitter / receiver 103 having an antenna 102, a handover instruction detector 104, a voice A data reproduction processing unit 105 and a speech speed conversion unit 106 are provided.
Further, the system controller 101 has a speech speed conversion processing control unit 107 as one important functional unit.

Under the control of the system controller 101, an audio output unit 108 such as a speaker, a memory unit 109 for storing programs and data, a display unit 110 for displaying operation functions and communication contents, and various operations are further provided. A receiving operation unit 111 is provided.
The antenna 102 is shared for transmission and reception by an antenna sharing circuit (Duplexer) (not shown) provided inside the RF transmission / reception unit 103 that performs transmission / reception processing related to an RF signal.

The RF transmitter / receiver 103 is provided with various functional units such as amplification, frequency conversion, demodulation, modulation, etc. (all of which are configured inside the RF transmitter / receiver 103, but not shown for each unit). These functions are configured so that each process is executed at a predetermined timing.
The handover instruction detecting unit 104 detects a signal instructing handover by monitoring the received signal in the RF transmitting / receiving unit 103, and is in cooperation with the system controller 101 to perform a handover instruction to the own device (mobile station 100). This constitutes a handover instruction detecting means as a component of the present invention for detecting the presence / absence of an error.

The audio data reproduction processing unit 105 reproduces audio data from the received signal at the RF transmission / reception unit 103 in cooperation with the system controller 101.
The speech rate conversion unit 106 performs speech rate conversion processing related to speech communication performed through its own device (speech mobile communication device 100) on the speech data in cooperation with the system controller 101. It constitutes a speech speed conversion means.
For example, as disclosed in the above-mentioned Patent Document 4 and the like, the speech speed conversion process can be applied with PICOLA (Pointer Interval Control Overlap and Add), TDHS (Time Domain Harmonic Scaling) method, and the like. However, it is not limited to these.

The speech speed conversion processing control unit 107, which is provided in the system controller 101 and constitutes the speech speed conversion processing control means as a component of the present invention, converts the speech speed according to the detection result of the handover instruction detection means (handover instruction detection unit 104). The operation of the means (speech speed conversion unit 106) is controlled.
In this case, when the handover instruction detection unit 104 detects a handover instruction, the speech speed conversion processing control unit 107 controls the speech speed conversion unit 106 to perform the speech speed conversion for reducing the speech speed.
For this reason, when the voice is transmitted at a normal speech speed, the interruption of the voice due to the handover which is felt is hardly noticed.

(Operation of the voice mobile communication apparatus as the first embodiment of the present invention)
FIG. 2 is a conceptual diagram for explaining the operation of the voice mobile communication device of FIG.
FIG. 3 is a flowchart for explaining the operation of the voice mobile communication apparatus of FIG.
In FIG. 2, there are a cell 211 formed by the base station A210 and a cell 221 formed by the base station B220. The cell 211 and the cell 221 partially overlap.
It is assumed that the mobile station 200 that is the voice mobile communication device in FIG. 1 is communicating with the base station A 210 that covers the cell 211 (FIG. 3: step S301).

The mobile station 200 is moving toward the cell 221 formed by the base station B220. As a result of this movement, the received power from the base station A210 decreases as the mobile station 200 moves away from the base station A210, and the communication quality such as the SN ratio deteriorates.
Therefore, base station A 210 instructs mobile station 200 to perform handover to base station B 220 based on a report (handover request) from mobile station 200.

More specifically, the above-described handover is performed as follows, for example.
Base station A 210 and base station B 220 each transmit a beacon signal including identification information for identifying the own station. On the other hand, the mobile station 200 receives beacon signals transmitted from the base station A 210 and the base station B 220 by the RF transmission / reception unit 103 (FIG. 1), and measures the electric field strength when the signals are received.

The mobile station 200 includes a base station list for storing the identification information included in the received beacon signal and the electric field strength of the beacon signal in association with each other in the memory unit 109 (FIG. 1). The contents of this base station list are updated every time.
The mobile station 200 determines an optimal base station for performing wireless communication with reference to the base station list. When it is determined that the optimal base station has changed, the mobile station 200 determines the optimal base station. A handover request to a handover candidate base station (base station B220), which is a station, is transmitted to the current base station (base station A210).

In response to this handover request response, the current serving base station (base station A 210) notifies the mobile station 200 of the handover candidate radio base station (base station B 220) (handover instruction). The mobile station 200 enters the handover process with the base station (base station B220) as a handover candidate by this notification.
The mobile station 200 (FIG. 1: handover instruction detection unit 104) constantly monitors the presence or absence of this handover instruction (FIG. 3: step S302), and when a handover instruction is detected (step S302: Yes), Then, the mobile station 200 activates the speech speed conversion function by the speech speed conversion unit 106 under the control of the speech speed conversion processing control unit 107 in the system controller 101 (step S303).

Note that the method for realizing the speech speed conversion function as described above is not limited to the above-described example, but the time axis on the base station side with respect to the voice data to be dealt with the speech speed conversion supplied from the mobile station side. A mode in which the conversion process itself is covered or a mode in which the speech speed conversion is executed by cooperation between the mobile station side and the corresponding base station side may be adopted.
For example, as described above, conversion for slowing down the speech speed is performed on the exchange of voice between the mobile station 200 and the base station A 210 by the speech speed conversion function.

In the mobile station 200, the system controller 101 monitors whether or not the handover to the base station B220 is successful (step S304), and when it is recognized that the handover is successful (step S304: Yes), the speech speed conversion processing control unit 107. Under the control, the speech speed conversion function by the speech speed conversion unit 106 is stopped (step S305).
As described above, it is effective that the voice speed can be experienced by the user by expanding the voice to the voice break that may occur due to handover by operating the speech speed conversion function as described above. To be avoided.

(Configuration of Voice Mobile Communication Device as Second Embodiment of the Present Invention)
FIG. 4 is a functional block diagram showing the configuration of the voice mobile communication apparatus as the second embodiment of the present invention.
In FIG. 4, a voice mobile communication device (mobile station) 400 has a system controller 401 that comprehensively manages the entire system, and under this, an RF transceiver unit 403 having an antenna 402, a reception quality measurement unit 404, a reception A state determination unit 405, an audio data reproduction processing unit 406, and a speech speed conversion unit 407 are provided.
Further, the system controller 401 has a speech speed conversion processing control unit 408 as one important functional unit.

Under the system controller 401, an audio output unit 409 such as a speaker, a memory unit 410 for storing programs and data, a display unit 411 for displaying operation functions and communication contents, and various operations are further provided. A receiving operation unit 412 is provided.
In this embodiment, the system controller 401 includes a handover status monitoring unit 413 that monitors the handover status in the voice mobile communication device 400 as one functional unit.

The antenna 402 is shared for transmission and reception by an antenna sharing circuit (Duplexer) (not shown) provided in the RF transmission / reception unit 403 that performs transmission / reception processing related to an RF signal.
The RF transmitting / receiving unit 403 is provided with functional units such as well-known amplification, frequency conversion, demodulation, modulation, and the like (all of which are configured inside the RF transmitting / receiving unit 403, but each is not shown). These functions are configured so that each process is executed at a predetermined timing.

The reception quality measurement unit 404 measures communication quality related to voice communication performed through the voice mobile communication device 400 (its RF transmission / reception unit 403) as its own device. The reception quality measurement means is a constituent element of.
Here, the reception quality measurement unit 404 includes the received power or the signal-to-interference ratio, the S / N ratio, and the path loss (loss in the propagation path) between the own apparatus and the base station due to the level of the received power. The reliable reception quality can be measured based on any of the characteristics highly correlated with the reception quality, which can contribute to accurate speech speed conversion control.

The reception state determination unit 405 determines whether the reception quality measured by the reception quality measurement unit (reception quality measurement unit 404) maintains a predetermined level in cooperation with the system controller 101. It constitutes reception state judging means as a constituent element of the invention.
Furthermore, the audio data reproduction processing unit 406 reproduces audio data from the received signal in the RF transmission / reception unit 403 in cooperation with the system controller 401.

The speech rate conversion unit 407 performs speech rate conversion processing related to speech communication performed through the own device (speech mobile communication device 100) on the speech data in cooperation with the system controller 401. It constitutes a speech speed conversion means.
Note that the speech speed conversion process itself is the same as the process described in the embodiment of FIG. 1, and since the speech speed is converted slowly, it is felt when the voice is transmitted at the normal speech speed. Such interruptions in voice are almost unnoticeable.

The speech speed conversion processing control unit 408 provided in the system controller 401 and constituting the speech speed conversion processing control means, which is a component of the present invention, converts the speech speed according to the determination result of the reception state determination means (reception state determination unit 405). The operation of the means (speech speed conversion unit 407) is controlled.
In this embodiment, when the reception state determination means (reception state determination unit 405) determines that the reception state does not maintain a predetermined level, the speech speed conversion processing control unit 408 performs a communication with the speech speed conversion unit 407. The operation is controlled so that the speech speed is converted slowly.
For this reason, when the voice is transmitted at the normal rate, the interruption of the voice due to the handover that is felt is hardly noticed.
As described above, in this embodiment, as one function unit of the system controller 401, the handover status monitoring unit 413 that monitors the handover status in the voice mobile communication device 400 is provided.

The speech speed conversion processing control unit 408 described above has a handover status monitoring unit that monitors the execution status of handover in the voice mobile communication device 400.
When the handover status monitoring unit recognizes the execution of the handover while the speech rate conversion unit (speech rate conversion unit 407) continues the speech rate conversion process, the reception state determination unit until the end of the handover is recognized. Regardless of the determination result by (reception state determination unit 405), control is performed so that the speech speed conversion process is continued.
As a result, even when the reception quality is maintained at a predetermined level, when handover occurs, it is possible to preferentially cope with a decrease in reception quality and to maintain the speech speed conversion process, thereby avoiding voice interruption.

(Operation of the voice mobile communication apparatus as the second embodiment of the present invention)
FIG. 5 is a conceptual diagram for explaining the operation of the voice mobile communication apparatus of FIG.
FIG. 6 is a flowchart for explaining the operation of the voice mobile communication apparatus of FIG.
In FIG. 5, it is assumed that the mobile station 500 which is the voice mobile communication apparatus 400 of FIG. 4 is communicating with the base station A 510 covering the cell 511 (FIG. 6: step S601).
The mobile station 500 is moving in the cell 511 of the base station A510. As the mobile station moves, the radio wave propagation environment between the mobile station 500 and the base station A 510 fluctuates, and the received power fluctuates greatly due to fading, shadowing, and the like.

In addition, when the received power fluctuates in this way, communication quality such as an SN ratio, a signal power to interference ratio, and a path loss between the mobile station 500 and the base station A 510 that are involved in communication between the mobile station 500 and the base station A 510 fluctuate. .
The state of this fluctuation is determined by whether or not the communication quality is constantly measured by the reception quality measurement unit 404 described above with reference to FIG. 4 and monitored by the reception state determination unit 405, and whether or not the communication quality is maintained at a predetermined level. Is determined (step S602).

The communication quality is monitored by the reception state determination unit 405. When the communication quality falls below a certain threshold, the communication between the mobile station 500 and the base station A 510 rapidly deteriorates, and the quality of voice communication also deteriorates accordingly. When further deteriorated, communication between the mobile station 500 and the base station A 510 is disconnected.
Accordingly, the reception state determination unit 405 determines whether or not the communication quality is equal to or lower than a predetermined level, that is, a threshold level that is a certain margin added from a threshold value that rapidly deteriorates the voice communication quality.

When the reception state determination unit 405 determines that the voice communication quality is equal to or lower than a predetermined level (step S602: Yes), the mobile station 400 uses this as a trigger to control the speech speed conversion processing control unit in the system controller 401. Under the control of 408, the speech speed conversion function by the speech speed conversion unit 407 is activated (step S603).
As described above with respect to the first embodiment, the method for realizing the speech speed conversion function is not limited to the above example, and it is possible to deal with speech data to be dealt with speech speed conversion supplied from the mobile station side. A mode in which the time base conversion process itself is covered on the base station side, or a mode in which the speech speed conversion is executed by cooperation between the mobile station side and the corresponding base station side may be adopted.

Therefore, when the speech speed conversion function is such that speech speed conversion processing is performed by the cooperation of the mobile station side and the corresponding base station side, the mobile station 500 side has a predetermined level of voice communication quality. The base station A 510 is notified of the following, and the base station A 510 and the mobile station 500 operate the corresponding speech speed conversion functions in response to this.
In the speech speed conversion function, for example, as described above, conversion for slowing down the reproduction speed is performed for the exchange of voice between the mobile station 500 and the base station A 510.

In the mobile station 500 (that is, the voice mobile communication device 400), the communication quality is constantly measured by the reception quality measuring unit 404 described above with reference to FIG. 4, monitored by the reception state determining unit 405, and the communication quality is predetermined. It is determined whether or not the level is maintained (step S604).
If the reception state determination unit 405 recognizes that the communication quality has recovered to the threshold value or more (step S604: Yes), the present embodiment does not unconditionally cancel the speech speed conversion, and further The handover execution status at that time is recognized by the above-described handover status monitoring unit 413 (step S605).
That is, even if the reception quality is recovered, the speech speed conversion function is suspended until the handover is completed.

In step S605, when it is recognized that the handover has not been started or the handover has been completed (step S605: Yes), the speech rate conversion process in the speech rate conversion unit 407 under the control of the speech rate conversion process control unit 408. Is stopped (step S606).
As a result, even if the reception quality is maintained at a predetermined level, when handover occurs, it is possible to preferentially cope with a decrease in reception quality and maintain the speech speed conversion function, thereby avoiding voice interruptions. .
As described above, when the speech speed conversion function is such that the speech speed conversion processing is performed by the cooperation between the mobile station side and the corresponding base station side, the mobile station 500 side performs voice communication. The base station A 510 is notified that the quality has been restored to a predetermined level, and the base station A 510 and the mobile station 500 stop the corresponding speech speed conversion functions when triggered by this.

As described above, by predicting the deterioration of the communication quality in advance and operating the speech rate conversion function, the voice reproduction can be extended for the interruption of the voice that may be caused by the deterioration of the communication quality, and the instantaneous voice It is possible to prevent the user from experiencing the interruption.
As described above, in the first embodiment, the success or failure of the handover is monitored (FIG. 3: step S304), and when it is recognized that the handover is successful, regardless of the reception quality, The speech speed conversion function was stopped.

However, the speech rate conversion function is not unconditionally stopped only by a successful handover (step S304: Yes), and the speech rate conversion function is activated on the condition that the reception quality is confirmed to be at a predetermined level. You may make it stop.
On the other hand, in the second embodiment, the speech speed conversion is not canceled unconditionally even if the reception quality is recovered, and the execution status of the handover at that time is recognized (FIG. 6). : Step S605), the speech speed conversion function is suspended until the handover is completed.
However, when the reception quality is recovered (step S604: Yes), the speech speed conversion function may be stopped without asking about the execution status of the handover as in step S605.

  The present invention relates to voice communication in a mobile communication system such as a mobile phone, for example, deterioration of voice quality depending on a radio wave propagation environment between a base station and a mobile station such as fading and shadowing, and a mobile communication system such as a handover. The present invention can be used to realize a voice mobile communication device that can effectively avoid interruption of voice due to voice communication quality degradation caused by the mechanism.

It is a functional block diagram showing the structure of the audio | voice mobile communication apparatus as the 1st Embodiment of this invention. It is a conceptual diagram for demonstrating the effect | action of the audio | voice mobile communication apparatus of FIG. 3 is a flowchart for explaining the operation of the voice mobile communication device of FIG. 1. It is a functional block diagram showing the structure of the audio | voice mobile communication apparatus as the 2nd Embodiment of this invention. It is a conceptual diagram for demonstrating the effect | action of the audio | voice mobile communication apparatus of FIG. It is a flowchart for demonstrating operation | movement of the audio | voice mobile communication apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Voice mobile communication apparatus 101 ... System controller 102 ... Antenna 103 ... RF transmission / reception part 104 ... Handover instruction detection part 105 ... Voice data reproduction process part 106 ... Speech speed conversion part 107 ... Speech speed conversion process control part 108 ... Voice output part 109 ... Memory unit 110 ... Display unit 111 ... Operation unit 200 ... Mobile station 210 ... Base station A
211 ... cell 220 ... base station B
221 ... cell 400 ... voice mobile communication device 401 ... system controller 402 ... antenna 403 ... RF transmission / reception unit 404 ... reception quality measurement unit 405 ... reception state determination unit 406 ... voice data reproduction processing unit 407 ... speech speed conversion unit 408 ... speech speed Conversion processing control unit 409 ... voice output unit 410 ... memory unit 411 ... display unit 412 ... operation unit 413 ... handover status monitoring unit 500 ... mobile station 510 ... base station A

Claims (3)

  A handover instruction detecting means for detecting presence / absence of a handover instruction for the own apparatus; a speech speed converting means for performing a speech speed conversion process related to voice communication performed through the own apparatus; and the speech according to a detection result of the handover instruction detecting means. A voice mobile communication apparatus comprising: speech speed conversion processing control means for controlling the operation of the speed conversion means.   The speech speed conversion processing control means controls the speech speed conversion means to perform a speech speed conversion operation that makes the speech speed slow when the handover instruction detection means detects a handover instruction. The voice mobile communication apparatus according to claim 1. Handover status monitoring means for monitoring the execution status of handover in the own apparatus, reception quality measuring means for measuring reception quality related to voice communication performed through the own apparatus, and reception quality measured by the reception quality measuring means is a predetermined value Reception state determination means for determining whether or not the level is maintained; speech speed conversion means for performing speech speed conversion processing related to the voice communication; handover status recognized by the handover status monitoring means; and the reception status A speech speed conversion processing control means for controlling the operation of the speech speed conversion means according to a determination result by the determination means, wherein the speech speed conversion processing control means continues the speech speed conversion processing by the speech speed conversion means. When the handover status monitoring means recognizes the execution of the handover, the handover status monitoring means Over until server end is recognized, the voice mobile communication apparatus characterized by controlling so as to sustain the determination result to depend not speech speed conversion processing by the reception state determining means.

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