JP2008067226A - Mobile terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile terminal device capable of smoothly transmitting image data in a short period of time even in an environment where a radio wave status is adverse. <P>SOLUTION: The mobile terminal device capable of exchanging video images with another terminal device at least, is equipped with: a detection means for detecting a received radio wave intensity; a transmission means for transmitting the video image to the other terminal device; an encode processing means for performing encode processing on the video image to be transmitted to the other terminal device by the transmission means at a predetermined bit rate; and an encode rule setting means for determining a value of the predetermined bit rate in the encode processing due to the encode processing means based on the radio wave intensity. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mobile terminal device such as a mobile phone, and more particularly to a mobile terminal device capable of transmitting and receiving image data.

  In recent years, mobile phones having a videophone function are increasing. As a technology related to the mobile phone having the videophone function, for example, Patent Literature 1 discloses the following technology.

That is, Patent Document 1 discloses a mobile phone having a videophone function and capable of performing various operations in a pocketable size. According to the technique disclosed in Patent Document 1, a mobile phone having high convenience and a videophone function is provided.
Japanese Patent Laid-Open No. 10-65780

  By the way, when the use environment of the mobile phone is an environment where the radio wave condition is bad, for example, the following situation occurs. That is, when the amount of image data to be transmitted to the mobile phone of the communication partner is large, for example, when using a videophone function, the time required to transmit the image data is very long in an environment where the radio wave condition is poor. turn into. This causes stress on both the user of the mobile phone on the image data transmitting side and the user of the mobile phone on the image data receiving side. Under such circumstances, there is a demand for a technique that enables smooth transmission of image data even in an environment where the radio wave condition is poor.

  In addition, the above-mentioned patent document 1 does not even suggest a technique that enables smooth transmission of image data even in an environment where the radio wave condition is poor.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a portable terminal device capable of smoothly transmitting image data in a short time even in an environment where a radio wave condition is bad.

  In order to achieve the above object, a mobile terminal device according to the first aspect of the present invention is a mobile terminal device capable of transmitting / receiving at least video to / from another terminal device, and detecting means for detecting received radio field intensity; A transmission means for transmitting the video to the other terminal apparatus; an encoding processing means for encoding the video transmitted to the other terminal apparatus by the transmission means at a predetermined bit rate; and And encoding rule setting means for determining a value of the predetermined bit rate in the encoding processing by the encoding processing means.

  In order to achieve the above object, a mobile terminal device according to the second aspect of the present invention is a mobile terminal device capable of transmitting and receiving at least video to and from another terminal device, and transmits the video to the other terminal device. Transmitting means, encoding processing means for encoding video transmitted to the other terminal device by the transmitting means at a predetermined bit rate, a value is calculated based on the received radio wave intensity, and based on the value Encoding rule setting means for determining a value of the predetermined bit rate in the encoding process by the encoding processing means.

  In order to achieve the above object, a mobile terminal device according to the third aspect of the present invention is a mobile terminal device capable of transmitting / receiving at least video to / from another terminal device, and receiving radio waves for detecting the sensitivity of received radio waves. Sensitivity detection means, sensitivity index calculation means for calculating a sensitivity index representing reception sensitivity of the received radio wave from a detection result by the reception radio wave sensitivity detection means, and transmission means for transmitting the video to the other terminal device The video signal transmitted to the other terminal device by the transmission unit is encoded at a predetermined bit rate, and the sensitivity index value calculated by the sensitivity index calculation unit has a predetermined threshold value. Exponential determination means for determining whether or not it exceeds, and based on the determination result by the exponent determination means, Characterized by comprising a an encoding rule setting means for determining a value of a predetermined bit rate.

  ADVANTAGE OF THE INVENTION According to this invention, the portable terminal device which can transmit image data smoothly in a short time also in the environment where a radio wave condition is bad can be provided.

[First Embodiment]
Hereinafter, a mobile phone according to a first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing the configuration of the mobile phone according to the first embodiment of the present invention.

  In the figure, a radio signal transmitted from a base station (not shown) is received by an antenna 11 and then input to a receiving circuit (RX) 13 via an antenna duplexer (DUP) 12. The receiving circuit 13 mixes the received radio signal with the local oscillation signal output from the frequency synthesizer (SYN) 14 and converts the frequency into an intermediate frequency signal (down-conversion). Then, the down-converted intermediate frequency signal is orthogonally demodulated and a received baseband signal is output. The frequency of the local oscillation signal generated from the frequency synthesizer 14 is indicated by a control signal SYC output from a control unit 23 including a microcomputer (CPU; Central Processing Unit) or the like.

  The reception sensitivity detection circuit 41 receives a reception signal strength indication signal RSSI (Receiving Signal Strength) which is a signal indicating the reception field strength of the radio signal from the intermediate frequency signal generated by the reception circuit 13 or from the reception baseband signal. (Indicator) is detected.

  The control unit 23 calculates SNIR (Signal to Noise Ratio) in the radio signal. This SNIR is also referred to as C / I, and is generally a DRC (Data Rate Control; a communication speed of a downlink signal requested by the AT, which is determined by the AN) notified from the AT (terminal side) to the AN (network side). Used when making decisions. 2 shows the EVDO system Rev. It is a figure which shows an example which took the response | compatibility of the said SNIR (C / I) vs. said DRC in A. Assume that the correspondence relationship between the SNIR (C / I) and the DRC is as shown in FIG.

  The RSSI and the SNIR are both parameters used for a radio wave sensitivity state check (see the flowchart shown in FIG. 7) described later.

  By the way, the received baseband signal is input to the CDMA signal processing unit 16. The CDMA signal processing unit 16 includes a RAKE receiver. In the RAKE receiver, the plurality of paths included in the received baseband signal are each subjected to despreading processing using spreading codes. Then, the signals of the respective paths subjected to the despreading process are synthesized after their phases are adjusted. Thus, received packet data in a predetermined transmission format is obtained. The received packet data is input to a compression / decompression processing unit (hereinafter referred to as a compander) 17.

  The compander 17 demultiplexes the received packet data output from the CDMA signal processing unit 16 for each medium by a demultiplexing unit. Then, the data for each separated medium is decrypted. For example, in the call mode, audio data such as call voice included in the received packet data is decoded by a speech codec.

  In addition, the mobile phone according to the first embodiment has a so-called videophone function, but if the received packet data includes video data as in the case of a videophone, the compander 17 converts the video data into a video codec. Decrypted by

  The digital audio signal obtained by the decoding process is supplied to a PCM code processing unit (hereinafter referred to as a PCM codec) 18. The PCM codec 18 performs PCM decoding on the digital audio signal output from the compander 17 and outputs an analog audio signal. The analog audio signal is amplified by the receiving amplifier 19 and then output from the speaker 20.

  When the audio playback mode is set, the control unit 23 reads out the corresponding audio content from the storage unit 24, decodes the audio content, and then decodes the audio content via the PCM codec 18 and the receiving amplifier 19. Amplify output from.

  Incidentally, the image data generated by decoding by the compander 17 is input to the control unit 23. The control unit 23 displays the image data output from the compander 17 on the display 28 via the video RAM. The control unit 23 displays not only the received image data but also image data captured by a camera 33 described later on the display 28 via the video RAM.

  The compander 17 supplies the email to the control unit 23 when the received packet is an email. The control unit 23 stores the electronic mail in the storage unit 24. Then, according to the operation state of the input device 27, the electronic mail is read from the storage unit 24 and displayed on the display 28.

  On the other hand, in the call mode, the voice signal of the speaker input to the microphone 21 is amplified to an appropriate level by the transmission amplifier 22 and then subjected to PCM encoding processing by the PCM codec 18 to become a digital audio signal, which is the compander. 17 is input. Further, image data output from a camera 33 described later is digitized by the control unit 23 and input to the compander 17. Note that the electronic mail created in the control unit 23 is also input from the control unit 23 to the compander 17.

  Here, the camera 33 is a camera for imaging. In the mobile phone according to the first embodiment, image data as a display image in a videophone is acquired by imaging with the camera 33.

  The compander 17 detects the energy amount of the input voice from the digital audio signal output from the PCM codec 18, and determines the transmission data rate based on the detection result. The digital audio signal is encoded into a signal having a format corresponding to the transmission data rate, thereby generating audio data. In addition, the image data output from the control unit 23 or the like is encoded (encoded) at a predetermined bit rate. Then, these audio data and image data are packetized according to a predetermined transmission format by the demultiplexing unit, and this transmission packet data is output to the CDMA signal processing unit 16. Even when an electronic mail is output from the control unit 23, the electronic mail is multiplexed with the transmission packet data.

  The CDMA signal processing unit 16 performs spread spectrum processing on the transmission packet data output from the compander 17 using a spreading code assigned to the transmission channel. Then, the output signal is output to the transmission circuit (TX) 15. The transmission circuit 15 modulates the spread spectrum signal using a digital modulation method such as a QPSK (Quadrature Phase Shift Keying) method. The transmission signal generated by this modulation is combined with a local oscillation signal generated from the frequency synthesizer 14 and frequency-converted into a radio signal. Then, the radio signal is amplified at a high frequency so that the transmission power level indicated by the control unit 23 is obtained. The amplified radio signal is supplied to the antenna 11 via the antenna duplexer 12, and is transmitted from the antenna 11 to a base station (not shown).

  The power supply circuit 26 generates a predetermined operating power supply voltage Vcc based on the output of the battery 25 and supplies it to each circuit unit. The battery 25 is charged by the charging circuit 29.

  Although the details will be described later with reference to the flowchart shown in FIG. 7, in the mobile phone according to the first embodiment, the control unit 23 determines the state of radio wave sensitivity based on the RSSI, the SNIR, or both. And, based on the result of the check, the setting of the encoding rule is changed when the compander 17 encodes the image data when the videophone function is used. Specifically, it is as follows.

  First, the control unit 23 calculates a radio wave sensitivity index from the RSSI, the SNIR, or both using a predetermined calculation formula. Then, it is determined whether or not the radio wave sensitivity index exceeds a predetermined threshold value. It is assumed that the radio sensitivity is better as the value of the radio sensitivity index is lower.

  Here, when the control unit 23 determines that the radio wave sensitivity index does not exceed the predetermined threshold, the control unit 23 sets an encoding rule for encoding the image data by the compander 17 to an initial setting bit rate (high (Encoding rule is not changed).

  On the other hand, when the control unit 23 determines that the radio wave sensitivity index exceeds the predetermined threshold, the control rule for encoding the image data by the compander 17 is lower than an initial setting bit rate. Set the bit rate encoding rule (change the encoding rule).

  That is, in the mobile phone according to the first embodiment, the control unit 23 determines an encoding rule (bit rate) for the encoding process by the compander 17 based on the RSSI and the SNIR.

  Hereinafter, an example of the appearance of the mobile phone according to the first embodiment will be described with reference to FIGS. 3 and 4.

  Here, FIG. 3 is an external view when the mobile phone 1 is opened about 180 degrees, FIG. 3 (A) is a front view, and FIG. 3 (B) is a side view. 4 is an external view when the cellular phone 1 is closed, FIG. 4 (A) is a front view, and FIG. 4 (B) is a side view. Here, in the mobile phone 1, the upper housing portion 2A and the lower housing portion 2B are connected via the hinge portion 2C.

  The upper casing 2A includes the display 28 composed of an LCD or the like, the speaker 20 as a receiver for producing received voice, magnetic sensors 3a and 3c for detecting the state of the mobile phone 1, the camera 33, an LCD And the like, and the electrostatic touch pad 4. Here, the sub-display 28a and the electrostatic touch pad 4 are provided on the same surface of the upper housing portion 2A. Similarly, the speaker 20, the display 28, and the camera 33 are provided on the same surface of the housing 2A.

  The lower housing portion 2B indicates a key 5A for inputting numbers, characters, operation of the mobile phone 1, a side key 5B, a microphone for collecting sound (in FIG. 4A, indicates a mouthpiece). 21) and magnetic sensors 3b and 3d for detecting the state of the mobile phone 1. Note that the key 5A and the side key 5B shown in FIG. 4 correspond to the input device 27 shown in FIG.

  Note that the magnetic sensors 3a to 3d provided in the upper housing portion 2A and the lower housing portion 2B output a detection signal when these sensors come close to each other within a predetermined distance. Here, among the sensors 3a to 3d, the pair consisting of the magnetic sensor 3a and the magnetic sensor 3b is a pair for detecting whether or not the upper housing portion 2A and the lower housing portion 2B overlap each other. is there.

  Hereinafter, a display example of the display 28 and an arrangement example of the key 5A will be described. Here, FIG. 5A is a display example of the display 28, and FIG. 5B is a diagram showing an arrangement example of the keys 5A.

  As shown in FIG. 5 (A), the display 28 has a current radio wave sensitivity level (RSSI or SNIR, or An antenna picture 51 indicating the current battery level of the mobile phone 1, a time display 53 indicating the current time, and BT (Bluetooth). (Registered trademark)) and a music icon 55 displayed when, for example, Music Player (hereinafter referred to as MP) is activated.

  Here, the BT icon 54 is displayed in blue when the BT is connected (blue in the ellipse in the figure), and is displayed in white during the server operation (waiting for BT connection) (shown in the figure). The inside of the ellipse is white). Then, when the BT connection is not made (including when the BT link is disconnected), it is controlled to turn off.

  The music icon 55 is displayed when the MP is activated as described above, but is also displayed when the music is played as background music (hereinafter referred to as BGM). Is controlled by the control unit 23 to be turned off.

  By the way, in the lowermost row of the display 28 (hereinafter referred to as a lower pictographic row), at that time, the soft key left 64, the enter key 65 (the center of the cross key 67), and the soft key right 66 are pressed. A brief description of the functions performed when operated is shown as lower left pict 56, middle lower pict 57, and lower right pict 58. Here, the left lower pict 56 corresponds to the soft key left 64, the middle lower pict 57 corresponds to the confirmation key 65, and the lower right pict 58 corresponds to the soft key right 66.

  For example, in the case where the display shown in FIG. 5A is displayed on the display 28, when the soft key left 64 is pressed, the function "return" is executed, and the confirmation key 65 is pressed. Then, although not shown in the figure, the currently focused function is selected. When the soft key right 66 is pressed, a “sub menu” is displayed on the display 28.

  By the way, as shown in FIG. 5B, the lower casing portion 2B includes, as the keys 5A, a numeric key 61, a “*” key 62, a “#” key 63, a soft key left 64, a confirmation key 65, A soft key right 66, a cross key 67, a mail key 68, a browser key 69, a call key 70, a power key 71, and a clear key 72 are provided.

  Here, the number key 61 is assigned with kana characters, symbol characters, alphabets, etc. in addition to numbers. For example, the numbers “1”, “a” “i” “ U, “e”, “o” kana characters and “.” “@” Symbols are assigned, and the numbers “2”, “ka” “ki” “ku” “ “K”, “K”, and alphabets such as “A”, “B”, “C”, “a”, “b”, and “c” are assigned.

  “*” Is assigned to the “*” key 62. The “*” key 62 is also a key for calling up a symbol list and a pictogram list in a character input state. “#” Is assigned to the “#” key 63. The “#” key 63 is also a key for reversing the character input toggle by the numeric key 61 in the character input state.

  The cross key 67 has an up key, a down key, a left key, a right key, and a confirmation key 65. That is, the cross key 67 is a key for moving the cursor or the like in the vertical and horizontal directions. The confirmation key 65 is a key for confirming various functions. The mail key 68 is a key for calling a mail transmission / reception function. The browser key 69 is a key for connecting to the Web or the like.

  The call key 70 is a key mainly used when receiving a call or making a normal call. The power key 71 is a key mainly for turning on / off the power, closing the call, and ending the function or editing. Further, the clear key 72 is a key mainly for clearing functions, editing, etc., and for erasing characters when inputting characters. If the clear key 72 is pressed while the display 28 is displaying a standby screen, a memo pad is called and displayed on the display 28.

  Hereinafter, operation control by the control unit 23 of the mobile phone according to the first embodiment will be described with reference to flowcharts shown in FIGS. 6 and 7. FIG. 6 is a flowchart schematically showing operation control related to image data processing when the videophone function is used. FIG. 7 is a flowchart showing a series of operation control of “encoding rule setting change” which is operation control peculiar to the first embodiment.

  First, image data used as a transmission image in a videophone is acquired by the camera 33 (step S1). Subsequently, the image data output from the camera 33 is digitized and then input to the compander 17, and the compander 17 performs an encoding process so that the image data can be transmitted at a predetermined bit rate (step S2). .

  Although details will be described with reference to the flowchart shown in FIG. 7, in the mobile phone according to the first embodiment, before performing the encoding process in step S <b> 2, based on the result of checking the state of the radio wave sensitivity as appropriate. “Encoding rule setting change (bit rate setting change)” in the encoding process of step S2 is performed (step S10).

  By the way, after finishing the process in the step S2, various processes described with reference to FIG. 1 are performed on the image data, and from the antenna 11 to the base station (not shown) via the antenna duplexer 12. (Step S3). Thereafter, the process returns to step S1.

  Hereinafter, a series of operation control (subroutine of step S10) of "encoding rule setting change" by the control unit 23 will be described with reference to a flowchart shown in FIG. Note that the operation control in the flowchart shown in FIG. 7 is performed independently of the operation control in the flowchart shown in FIG.

  First, the RSSI detected by the reception sensitivity detection circuit 41 is received, and the SNIR in the received signal is calculated (step S101). Subsequently, the state of the radio wave sensitivity is checked based on the RSSI, the SNIR, or both (step S102). Specifically, in step S102, a radio wave sensitivity index is calculated from the RSSI, the SNIR, or both using a predetermined calculation formula.

  Then, after calculating the radio wave sensitivity index in step S102, it is determined whether or not the radio wave sensitivity index exceeds a predetermined threshold (step S103). If it is determined in step S103 that the radio wave sensitivity index does not exceed the predetermined threshold, the encoding rule for the encoding process of the image data by the compander 17 in step S2 is set to an initial setting bit rate. The encoding rule is set (step S104). In other words, the encoding rule setting is not changed in step S104. Thereafter, the process returns to step S101.

  On the other hand, if it is determined in step S103 that the radio wave sensitivity index exceeds a threshold value, the encoding rule when the image data is encoded by the compander 17 in step S2 is determined based on the initial set bit rate. Are set to the low bit rate encoding rule (step S105). Thereafter, the process returns to step S101.

  As described above, according to the first embodiment, it is possible to provide a mobile terminal device that can smoothly transmit image data in a short time even in an environment with a poor radio wave condition.

  Therefore, according to the mobile terminal device according to the first embodiment, even when transmitting image data having a large data capacity in an environment where the radio wave condition is poor, for example, even when using the videophone function, the image In the terminal device on the data receiving side, the display update of the received image data is performed smoothly. That is, it is possible to prevent display update delay of received image data in a terminal device that receives the image data. Thereby, it is possible to prevent the user of the receiving terminal device from feeling stressed with respect to the display update of the received image data.

[Second Embodiment]
Next, a mobile phone according to a second embodiment of the present invention will be described. The main difference between the first embodiment and the second embodiment is that, in the first embodiment, the bit rate that can be set in “encoding rule setting change” has two stages (initial setting bits). In the second embodiment, the bit rate that can be set in the “encoding rule setting change” is three stages (initial bit rate, medium bit rate, and low bit rate). Low bit rate). Here, the mobile phone according to the second embodiment will be described focusing on the differences.

  Hereinafter, a series of operation control of “encoding rule setting change” by the control unit 23 in the mobile phone according to the second embodiment will be described with reference to a flowchart shown in FIG. Note that the same step numbers are assigned to the steps for performing the same operation control as the operation control described with reference to FIG. 7 in the first embodiment, and the description thereof is omitted.

  After calculating the radio wave sensitivity index from the RSSI, the SNIR, or both in the step S102 by a predetermined calculation formula, it is determined whether or not the radio wave sensitivity index exceeds a first threshold (step S203).

  If it is determined in step S203 that the radio wave sensitivity index does not exceed the first threshold value, the encoding rule for the encoding process of the image data by the compander 17 in step S2 is set to an initial setting bit rate. The encoding rule is set (step S204). In other words, the encoding rule setting is not changed in step S204. Thereafter, the process returns to step S101.

  On the other hand, if it is determined in step S203 that the radio wave sensitivity index exceeds the first threshold value, it is determined whether or not the radio wave sensitivity index exceeds a second threshold value (step S205). Here, it is assumed that the second threshold value is larger than the first threshold value.

  If it is determined in step S205 that the radio wave sensitivity index does not exceed the second threshold value, the encoding rule for the encoding process of the image data by the compander 17 in step S2 is determined from an initial setting bit rate. The encoding rule is set to “medium bit rate”, which is a lower bit rate (step S206). Thereafter, the process returns to step S101.

  By the way, if it is determined in step S205 that the radio wave sensitivity index has exceeded the second threshold value, the encoding rule when the image data is encoded by the compander 17 in step S2 is determined from the medium bit rate. The encoding rule of “low bit rate” which is a lower bit rate is set (the encoding rule is changed) (step S207). Thereafter, the process returns to step S101.

  As described above, according to the second embodiment, image data can be transmitted smoothly and in a short time even in an environment where the radio wave condition is bad, and the mobile terminal device according to the first embodiment can be used. It is possible to provide a mobile terminal device capable of setting a more detailed encoding rule than that.

  Therefore, according to the mobile terminal device according to the second embodiment, when transmitting image data having a large data capacity in an environment where the radio wave condition is bad, for example, even when using a videophone function, the image In the terminal device on the data receiving side, the display update of the received image data is performed smoothly. That is, it is possible to prevent display update delay of received image data in a terminal device that receives the image data. Thereby, it is possible to prevent the user of the receiving terminal device from feeling stressed with respect to the display update of the received image data. Since the encoding rule can be set more finely than the portable terminal device according to the first embodiment, the display update of the image data in the terminal device that receives the image data is also more optimal. This is done at the display update rate.

  As described above, the encoding rule is not determined by comparing the radio wave condition index with the first threshold value or the second threshold value, but simply corresponding to the RSSI or the DRC (or the SNIR). Of course, the encoding rule may be determined. In this case, the relationship between the RSSI or the DRC and the bit rate in the encoding rule may be set as shown in FIG. 9, for example. It should be noted that the specific numerical values of the RSSI and the DRC shown in FIG. 9 are merely examples, and of course are not limited to those numerical values.

  As mentioned above, although this invention was demonstrated based on 1st Embodiment and 2nd Embodiment, this invention is not limited to embodiment mentioned above, A various deformation | transformation and application are within the range of the summary of this invention. Of course it is possible.

  For example, in the first embodiment and the second embodiment, the above-described encoding rule is set based on whether or not the radio wave sensitivity index exceeds the predetermined threshold, but the radio wave sensitivity index Of course, the above-described encoding rule may be set on the basis of whether or not the predetermined threshold value has exceeded a predetermined threshold value for “a predetermined time or more”.

  In this way, when the radio wave sensitivity index exceeds the predetermined threshold “instantaneously (only for a short time)”, that is, when it is not necessary to change the encoding rule, the encoding rule is changed wastefully. Can be prevented.

  In the first embodiment, the bit rate that can be set in “encoding rule setting change” is two stages. In the second embodiment, the bit rate that can be set in “encoding rule setting change”. Is set to three levels (normal high bit rate, medium bit rate, and low bit rate), but the bit rate that can be set in “encoding rule setting change” may be set to four or more levels. is there.

  Further, the above-described embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be extracted as an invention.

1 is a block diagram showing a configuration of a mobile phone according to a first embodiment of the present invention. EVDO System Rev. The figure which shows an example of the conversion table of C / I vs. DRC in A. (A) is an external view when the cellular phone according to the first embodiment of the present invention is opened about 180 degrees. (B) is the same side view. (A) is a front view when the mobile phone according to the first embodiment of the present invention is closed. (B) is the same side view. (A) is a figure which shows the example of a display of a display. (B) is a figure which shows an example of arrangement | positioning of a key. The figure which shows the flowchart which shows simply the operation control relevant to the process of the image data at the time of videophone function utilization. The figure which shows the flowchart which shows the operation control of the "setting change of an encoding rule" by the control unit in the mobile telephone which concerns on 1st Embodiment of this invention. The figure which shows the flowchart of operation | movement control of the "setting change of an encoding rule" by the control unit in the mobile telephone which concerns on 2nd Embodiment of this invention. The figure which shows an example of the relationship between RSSI and DRC, and a bit rate.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 1 ... Mobile phone, 2A ... Upper housing | casing part, 2B ... Lower housing | casing part, 2C ... Hinge part, 2B ... Lower housing | casing part, 3a, 3b, 3c, 3d ... Magnetic sensor, 4 ... Electrostatic touchpad, 5A ... key, 5B ... side key, 11 ... antenna, 12 ... antenna duplexer, 13 ... receiving circuit, 14 ... frequency synthesizer, 15 ... transmitting circuit, 16 ... CDMA signal processing unit, 17 ... compression / decompression processing unit, 18 ... PCM Code processing unit, 19 ... receive amplifier, 20 ... speaker, 21 ... microphone, 22 ... transmitter amplifier, 23 ... control unit, 28 ... display, 33 ... camera, 41 ... receive sensitivity detection circuit, 56 ... bottom left pictogram, 57 ... Middle bottom pictograph, 58 ... Bottom right pictograph, 61 ... Number keys, 62 ... "*" key, 63 ... "#" key, 64 ... Soft key Left, 65 ... enter key, 66 ... soft key right, 67 ... cross key, 68 ... mail key, 69 ... browser key, 70 ... call key, 71 ... power key, 72 ... clear key.

Claims (5)

A portable terminal device capable of transmitting and receiving at least video with other terminal devices,
Detection means for detecting the received radio field intensity;
Transmitting means for transmitting the video to the other terminal device;
Encoding processing means for encoding video to be transmitted to the other terminal device by the transmission means at a predetermined bit rate;
An encoding rule setting means for determining a value of the predetermined bit rate in the encoding process by the encoding processing means based on the radio wave intensity;
A portable terminal device comprising: A portable terminal device capable of transmitting and receiving at least video with other terminal devices,
Transmitting means for transmitting the video to the other terminal device;
Encoding processing means for encoding video to be transmitted to the other terminal device by the transmission means at a predetermined bit rate;
An encoding rule setting unit that calculates a value based on the received radio wave intensity and determines a value of the predetermined bit rate in the encoding process by the encoding processing unit based on the value;
A portable terminal device comprising:   When it is determined that the radio field intensity is lower than a predetermined value, the encoding rule setting unit sets the predetermined bit rate value in the encoding processing by the encoding processing unit to a low value. The portable terminal device according to claim 1. A portable terminal device capable of transmitting and receiving at least video with other terminal devices,
A reception radio wave sensitivity detection means for detecting the sensitivity of the received radio wave;
Sensitivity index calculating means for calculating a sensitivity index representing the received sensitivity of the received radio wave from the detection result by the received radio wave sensitivity detecting means,
Transmitting means for transmitting the video to the other terminal device;
Encoding processing means for encoding video to be transmitted to the other terminal device by the transmission means at a predetermined bit rate;
Index determining means for determining whether or not the value of the sensitivity index calculated by the sensitivity index calculating means exceeds a predetermined threshold;
An encoding rule setting unit that determines a value of the predetermined bit rate in the encoding process by the encoding processing unit based on a determination result by the exponent determination unit;
A portable terminal device comprising: The encoding rule setting means includes
When the exponent determination unit determines that the sensitivity index exceeds the predetermined threshold, the predetermined bit rate value in the encoding process by the encoding processing unit is set to a low value. The mobile terminal device according to claim 4.

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