JP2007013402A - Mobile phone terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem as much as possible wherein an S/N ratio deteriorates when voice is outputted in either of a hand-set mode and a handsfree mode from a speaker for double purpose at a mobile phone terminal capable of switching reception status between these modes. <P>SOLUTION: The mobile phone terminal comprises a first amplifier 8 for amplifying voice signals to output from a speaker 3 for double purpose during a handsfree mode, and a second amplifier 9 for amplifying voice signals to output from the speaker 3 during a hand-set mode. An amplifier of a small volume drive for driving small sound volume and of low noises for suppressing a noise level in a static status is adopted as the second amplifier 9, compared with the first amplifier 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile phone terminal represented by, for example, a mobile phone or a PHS (Personal Handy-phone System), and more specifically, a handset mode in which a user holds a phone call and a phone call without a user holding the phone. The present invention relates to a portable telephone terminal that can be used by switching to a hands-free mode.

  As a portable telephone terminal of this type, what is conventionally known generally has a receiver as a voice receiver and a speaker as a loudspeaker for a received signal, which are switched depending on the application. For example, in the case of the conventional uniaxial folding method, the positions of the microphone A1 and the receiver A2 are arranged as shown in FIG. Further, in hands-free calling, the positions of the microphone A1 and the speaker 3 are arranged as shown in FIG. 9, for example, and are arranged as shown in FIG.

  On the other hand, in recent years, a portable telephone terminal having a multi-axis folding configuration exists as a terminal having a characteristic shape. When this multi-axis folding is used, it is necessary to attach the receiver B4 (or microphone B5) to another position due to the positional relationship between the microphone A1 and the receiver A2 depending on the shape change.

  For example, in the case of the two-axis folding method, when looking at the case where it is not folded and the case where it is folded, the positions of the microphone A1 and the receiver A2 are arranged as shown in FIG. In hands-free calling, the positions of the microphone A1 and the speaker 3 are arranged as shown in FIG.

  When folded, the positions of the microphone A1 and the receiver A2 in the handset call when the folding is performed according to (inversion of the rotation axis A shown in FIG. 11) and (folding of the rotation axis B shown in FIG. 12) are as shown in FIG. However, it can be seen that the microphone A1 and the receiver A2 are close to each other in an overlapping state.

  In this state, the microphone A1 picks up the sound emitted from the receiver A2, and returns an echo as a voice input to the other party, so it has a significant effect on clean call quality.

  Therefore, it is necessary to separately attach a receiver B4 at a place away from the microphone A1, and the position of the receiver B4 shown in FIG. 16, for example, is selected as the place.

  Further, in the hands-free call, the positions of the microphone A1 and the speaker 3 are arranged as shown in FIG. 17 and are collectively shown in FIG. 18, and it can be seen that the receiver B4 and the speaker 3 are densely arranged near the hinge portion.

  Next, consider another configuration in which the receiver B4 is not added. In the case of a handset call, the receiver A2 is used, and it is necessary to newly attach a microphone B5 in order to avoid a state of being close to the microphone A1 when folded.

  Therefore, the position shown in FIG. 19 is selected as a place where the microphone B5 is attached at a place away from the receiver A2.

  When this is put together, the component arrangement of FIG. 20 is obtained, and it can be seen that the microphone B5 and the speaker 3 are densely arranged near the hinge as shown in FIG.

  In order to solve the above problems of restrictions on the mounting space in the housing due to the increase in parts and the problem of deterioration in call quality due to echoes being returned to the other party as voice input, the loudspeaker is also used as a normal receiver call. It is possible to do.

  As a configuration in which the loudspeaker can also be used as a normal receiver call, for example, there are those described in Patent Document 1 and Patent Document 2.

  The technique disclosed in Patent Document 1 is a technique for controlling amplifier gain based on communication information acquired at the time of establishing a data link, and the technique disclosed in Patent Document 2 is an invention that switches a reception path according to the status of a device. It is characterized in that the status is changed according to the open / close state of the device during a call and the call path is automatically switched.

For both technologies, the correspondence between the handset mode and the hands-free mode can be switched by simply switching the volume of the loudspeaker (combined speaker) by switching the gain (gain) of the received audio signal. ing.
JP-A-11-289290 JP 2003-18078 A

  FIG. 22 shows an example of general control of the prior art that simply uses the volume switching of a loudspeaker (combined speaker) as a means for switching the reception state between the handset mode and the hands-free mode. Referring to FIG. 22, a conventionally known CODEC IC (coder-decoder integrated circuit) 7 capable of switching the output power (Gain) of the amplifier is provided, and this CODEC IC 7 is also used for a hands-free call. The output power (Gain 1) for the speaker 3 and the output power (Gain 2) for the dual-purpose speaker 3 that is equivalent to the receiver B during a handset call are controlled by the software of the control LSI 6, and the sound processed by using Gain 1 or Gain 2 is processed. The signal is output to the dual-purpose speaker 3 via the amplifier (1) 8. The output power (Gain 1) and the output power (Gain 2) are the amplification factors of the audio signal by the amplifier (1) 8.

  During a hands-free call, Gain 1 is selected, and an audio signal calculated using Gain 1 is output to a dual-purpose speaker via an amplifier. When used as a receiver during a handset call, Gain 2 is selected, and an audio signal calculated using Gain 2 is output to the dual-purpose speaker 3 through the amplifier and equivalent to the receiver.

  FIG. 23 is a flowchart showing the control operation of the control LSI 6 in the control circuit shown in FIG. First, in step S (hereinafter simply referred to as S) 1, GAIN change factor acceptance processing is performed. This GAIN change factor can be considered, for example, when the user operates the key operation unit of the mobile phone to switch from the handset mode to the handsfree mode or vice versa. Next, in S2, it is determined whether Gain1 has been requested. When the handset mode is switched to the hands-free mode, it is determined in S2 that Gain1 has been requested, the control advances to S3, and control is performed to output a signal for switching processing to Gain1 to the CODEC IC6.

  On the other hand, when switching from the hands-free mode to the handset mode, a determination of NO is made in S2, control proceeds to S4, and control is performed to output a signal for switching processing to Gain 2 to the CODEC IC.

  As described above, the conventional amplifier is based on the premise that the same amplifier (1) 8 is used for both the handset and hands-free operation, and is designed to drive the dual-purpose speaker 3 with a large sound volume when hands-free. Since the output volume is reduced only by adjusting the output power (Gain) when using the amplifier (1) 8 at the time of handset, that is, as a receiver, there is a disadvantage that the S / N ratio is deteriorated.

  The present invention has been devised in view of such circumstances, and the purpose of the present invention is to provide a portable telephone terminal capable of switching the reception state between the handset mode and the hands-free mode, in the handset mode and the hands-free mode. It is an object of the present invention to provide a portable telephone terminal that can prevent the inconvenience that the S / N ratio is deteriorated as much as possible even if the sound is output from the dual-purpose speaker used in any case.

  The present invention is a portable telephone terminal that can be used by switching between a handset mode in which a user holds a call and a hands-free mode in which the user can make a call without having a hand. The received voice signal is used as a voice. A speaker for output, which is a dual-purpose speaker used in both the handset mode and the hands-free mode, and a first amplifier for amplifying an audio signal and outputting the same from the dual-purpose speaker in the hands-free mode A second amplifier for amplifying the audio signal in the handset mode and outputting it from the dual-purpose speaker; and a volume at which the user can hear the volume of the voice output from the dual-purpose speaker in the handsfree mode The audio signal is controlled to be amplified by the first amplifier at the first amplification factor, and And a control means for performing control to amplify the audio signal by the second amplifier at a second amplification factor smaller than the first amplification factor in the reset mode. The second amplifier is compared with the first amplifier. The present invention is characterized in that it is composed of a low volume amplifier that drives a small volume and that suppresses a static noise level.

  Preferably, the first circuit state in which the first amplifier and the dual-purpose speaker are in a conductive state and the second amplifier and dual-purpose speaker are in the non-conductive state, and the second amplifier and the dual-purpose speaker are in a conductive state. And a circuit state switching means for switching the first amplifier and the dual-purpose speaker to any one of a second circuit state for making the non-conducting state, and the control means includes the circuit state switching means in the hands-free mode. In the handset mode, the circuit state switching means is controlled to the second circuit state.

  More preferably, the control means executes control by software.

  According to the present invention, the first amplifier for amplifying the audio signal in the hands-free mode and outputting it from the dual-purpose speaker; and the second amplifier for amplifying the audio signal in the handset mode and outputting it from the dual-purpose speaker; The second amplifier is a low-volume amplifier that drives a small volume compared to the first amplifier, and is a low-noise amplifier that suppresses a static noise level. As a result, inconvenience that the S / N ratio deteriorates can be prevented as much as possible while outputting sound from the dual-purpose speaker used in both the handset mode and the hands-free mode.

  In addition, the first amplifier and the dual-purpose speaker are brought into a conductive state in the hands-free mode and the second amplifier and the dual-use speaker are brought into a non-conductive state, and the second amplifier and the dual-purpose speaker are shared in the handset mode. When the second circuit state is set in which the speaker is in a conductive state and the first amplifier and the dual-purpose speaker are in a non-conductive state, for example, the user brings the dual-purpose speaker close to the ear in the handset mode. When a call is made, a dangerous situation in which a loud sound is output from the dual-purpose speaker via the first amplifier due to some malfunction can be avoided as much as possible, and safety can be improved.

  Furthermore, when the control means executes control by software, it is possible to easily design even relatively complicated control contents.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings. In the present embodiment, a mobile phone is shown as an example of a mobile phone terminal, but the present invention is not limited to this, and may be a PHS (Personal Handy-phone System), for example.

  By generating the sound generated by the receiver B4 of FIG. 18 using the dual-purpose speaker 3, the receiver B4 is eliminated, and the configuration shown in FIG.

  In FIG. 1, in the case of a handset call without folding, the shape is as shown in FIG. 13, and the receiver (sound generator) used in this case is the receiver A2.

  In FIG. 1, in the case of a hands-free call without folding, the shape is as shown in FIG. 14, and the receiver (sound generator) used in this case is the dual-purpose speaker 3.

  In FIG. 1, in the case of a handset call in a folded state, the shape is as shown in FIG. 17, and the receiver (sound generator) used in this case uses the dual-purpose speaker 3 as an equivalent output of the receiver B4.

  In FIG. 1, in the case of a hands-free call in a folded state, the shape is as shown in FIG. 17, and the receiver (sound generator) used in this case is a dual-purpose speaker 3.

Next, contents relating to the circuit configuration will be described.
Referring to FIG. 2, in the CODEC IC (coder-decoder integrated circuit) 7, the output power (Gain 1) for the dual-purpose speaker 3 during the hands-free call and the dual-purpose speaker 3 that is equivalent to the receiver B 4 during the handset call. Is controlled by software of the control LSI 6, and an audio signal calculated using Gain 1 or Gain 2 is output to the dual-purpose speaker 3 via the amplifier (1) 8. The output power (Gain 1) and the output power (Gain 2) are the amplification factors of the audio signal by the amplifier (1) 8. In addition, for example, when the user operates a key operation unit of a mobile phone, the user can switch between a handset mode in which the user holds a call and a hands-free mode in which the user can make a call without holding the hand. ing.

  At the time of a hands-free call, Gain 1 is selected, and an audio signal calculated using Gain 1 is output from the dual-purpose speaker 3 via the amplifier (1) 8. When the dual-purpose speaker 3 is used as a receiver during a handset call, the gain 2 is selected, and the audio signal calculated using the gain 2 is equivalent to the dual-purpose speaker 3 via the amplifier (2) 9 as a receiver. Output.

  During a hands-free call, the gain setting of the CODEC IC 7 is used to set Gain 1 and set the path to be output to the amplifier (1) 8. Further, the audio is output to the dual-purpose speaker 3 by the control of selecting the amplifier (1) 8. During a call as a handset, the gain setting of the CODEC IC 7 is used to set Gain 2 and the path setting to be output to the amplifier (2) 9, and further the volume is reduced by the control of selecting the amplifier (2) 9, and the dual-purpose speaker 3 is output as a sound corresponding to a receiver.

Next, another embodiment will be described with reference to FIG. In the embodiment of FIG. 2, the outputs of the amplifiers (1) 8 and 9 are directly connected to the dual-purpose speaker 3, and if the control LSI 6 malfunctions, an abnormal state in which signals overlap may occur. A configuration example incorporating a workaround in such a case is the embodiment of FIG.
In addition to the gain setting, path setting, and selection control of the amplifier (1) 8 or amplifier (2) 9 by the control LSI 6 described in FIG. 2, the output of the amplifier (1) 8 is connected to the output of the dual-purpose speaker 3. SW (1) 10 capable of on / off control and SW (2) 11 capable of on / off control are provided by connecting the output of the amplifier (2) 9 to the output of the dual-purpose speaker 3. Since SW1 and SW2 control signals from the control LSI 6 are supplied to the SW (2) 11 via the inverter 12, when one of the SW (1) 10 and SW (2) 11 is ON, The other is turned off.

  During a hands-free call, the gain setting of the CODEC IC 7 is used to set Gain 1 and set the path to be output to the amplifier (1) 8. Further, the control for selecting the amplifier (1) 8 and the SW control signal from the control LSI 6 The sound is output to the dual-purpose speaker 3 by the control of turning on the SW (1) 10. Here, since the SW control signal of SW (2) 11 is inverted by the inverter 12 and operates reversely to SW (1) 10, the state is turned off, and the signal on the amplifier (2) 9 side is also used. It does not flow to the speaker 3. During a call as a handset, the gain is set in the CODEC IC7, the gain 2 is set, the path is set to be output to the amplifier (2) 9, and the SW (2) 11 is controlled to turn on the dual speaker. 3 is output as a sound corresponding to a receiver. The SW (1) 10 is turned off, and the signal on the amplifier (1) 8 side does not flow to the dual-purpose speaker 3. Although SW (1) 10 and SW (2) 11 are separated in the drawing, the configuration with one SW13 is possible by using SW13 selected from two inputs as shown in FIG.

Next, the control operation of the control LSI will be described with reference to FIGS.
FIG. 5 is a flowchart showing the control operation of the control LSI 6 in the control circuit shown in FIG. In step S (hereinafter simply referred to as S) 10, a GAIN change factor acceptance process is performed. This is, for example, processing for accepting an operation when the user operates the key operation unit of the cellular phone to switch from the handsfree mode to the handset mode or vice versa. Next, control proceeds to S11, where it is determined whether Gain1 has been requested. When the handset mode is switched to the hands-free mode, a determination of YES is made in S11, the control proceeds to S12, and a process of outputting a signal for switching to Gain 1 to the CODEC IC is performed. Upon receiving this signal, the CODEC IC 7 outputs a signal for controlling the amplification factors of the amplifier (1) 8 and the amplifier (2) 9 according to Gain 1. Next, the control advances to S13, and control is performed so that the amplifier (2) 9 control signal is set to Low (amplifier 2 is inactivated) and the amplifier (1) 8 control signal is set to Hi (amplifier 1 is activated). As a result, when Gain 1 is selected, only the amplifier (1) 8 is activated and the amplifier (2) 9 is deactivated (disabled). As a result, when Gain 1 is selected, only the amplifier (1) 8 is activated and the amplification factor is controlled to comply with Gain 1, and then the audio is transmitted via the amplifier (1) 8. A signal is output to the dual-purpose speaker 3, and sound is output from the dual-purpose speaker 3.

  When switching from the hands-free mode to the handset mode, a determination of NO is made in S11, the control proceeds to S14, and processing for outputting a signal for switching processing to Gain 2 to the CODEC IC 7 is performed. As a result, the CODEC IC 7 outputs a signal for controlling the amplifier (1) 8 and the amplifier (2) 9 so as to obtain an amplification factor according to Gain2. Next, the control advances to S15, and control is performed so that the amplifier 1 control signal is set to Low (amplifier 1 is inactivated) and the amplifier 2 control signal Hi (amplifier 2 is activated). As a result, when Gain 2 is selected, only the amplifier (2) 9 is activated, and the amplification factor is controlled to be in accordance with Gain 2, and then passed through the amplifier (2) 9. Then, the audio signal is output to the dual-purpose speaker 3, and the voice is output from the dual-purpose speaker 3.

  FIG. 6 is a flowchart showing the control operation of the control LSI 6 in the control circuit shown in FIG. Regarding the same contents as the control shown in FIG. 5, the description will not be repeated and the differences will be mainly described. If it is determined in S21 that Gain1 has been requested, control proceeds from S22 to S23 to S24, and control is performed to set the SW1 and SW2 control signals to Hi (SW1 is ON and SW2 is OFF). As a result, SW (1) 10 is turned on and SW (2) is turned off, so that amplifier (1) 8 and dual-purpose speaker 3 are in a conductive state, and amplifier (2) 9 and dual-purpose speaker 3 are not connected. It becomes conductive.

  Thereby, when Gain 1 is selected, it is possible to avoid the inconvenience that a sound signal amplified through the amplifier (2) 9 due to some malfunction is given to the dual-purpose speaker 3 and the sound is output.

  On the other hand, if NO is determined in S21, the control proceeds from S25 to S26 to S27, and the process of controlling the SW1 and SW2 control signals to Low (SW1 is OFF and SW2 is ON) is performed in S27. . As a result, when Gain 2 is selected, the amplifier (1) 8 and the dual-purpose speaker 3 are in an insulated state, and the amplifier (2) 9 and the dual-purpose speaker 3 are in a conductive state. As a result, when Gain 2 is selected, it is possible to prevent an inconvenience that an audio signal amplified through the amplifier (1) 8 is given to the dual-purpose speaker 3 and output from the dual-purpose speaker 3 due to some malfunction. it can.

  FIG. 7 is a flowchart showing a control operation of the control LSI 6 in the control circuit shown in FIG. The difference from the above is that if YES is determined in S31, the control proceeds from S32 to S33 to S34. In S34, the SW control signal is transferred to Hi (the amplifier 1 and the speaker via SW3). The control is made to conduct). As a result, the amplifier (1) 8 and the dual-purpose speaker 3 become conductive, while the amplifier (2) 9 and the dual-purpose speaker 3 become insulated. As a result, when Gain 1 is selected, it is possible to prevent inconvenience that the audio signal amplified through the amplifier (2) 9 is given to the dual-purpose speaker 3 due to some malfunction and the voice is output from the dual-purpose speaker 3. .

  If NO is determined in S31, the control proceeds from S35 to S36 to S37. In S37, the SW control signal is controlled to be Low (the amplifier 2 and the speaker are electrically connected via SW3). As a result, when Gain 2 is selected, the amplifier (1) 8 and the dual-purpose speaker 3 are in an insulated state, and the amplifier (2) 9 and the dual-purpose speaker 3 are in a conductive state. Thereby, when Gain 2 is selected, it is possible to prevent the problem that the audio signal amplified through the amplifier (1) 8 due to some malfunction is given to the dual-purpose speaker 3 and the voice is output from the dual-purpose speaker 3. .

  The amplifier (2) 9 described above is a low-noise drive amplifier (receiver amplifier) that drives a small volume compared to the amplifier (1) 8, and is a low-noise amplifier that suppresses a static noise level. Has been. The amplifier (1) 8 is composed of a speaker amplifier. Specifically, for example, the amplifier (1) 8 has an output gain of 20 dB, an S / N ratio of about 70 dB, and an AGC (Automatic Gain Control) function. The amplifier (2) 9 has an output gain of 6 dB and an S / N ratio of about 90 dB. With this configuration, it is possible to prevent as much as possible the inconvenience that the S / N ratio deteriorates while outputting sound from the dual-purpose speaker 3 that is also used in both the handset mode and the hands-free mode.

  If the contents of the above embodiment are used for a portable telephone terminal having a multi-axis folding configuration, the following effects are obtained.

By eliminating the receiver B4, the number of mounted parts can be reduced and the production cost can be reduced.
Omission of the receiver B4 provides a margin for securing a mounting space near the hinge portion.

The failure rate can be reduced by reducing the number of mounted components.
The above explanation shows an embodiment and does not have a restrictive meaning of the present plan. Therefore, even when changes, corrections and improvements of the embodiments are made, it is intended to be included within the spirit and scope of application of the present invention.

It is component arrangement drawing of a biaxial hinge mechanism. It is a block diagram which shows the circuit structure of the principal part. It is a block diagram which shows the circuit structure of the principal part in other embodiment. It is a block diagram which shows the circuit structure of the principal part in other embodiment. 3 is a flowchart showing a control operation of a control LSI in the control circuit shown in FIG. 4 is a flowchart showing a control operation of a control LSI in the control circuit shown in FIG. 3. 5 is a flowchart showing a control operation of a control LSI in the control circuit shown in FIG. It is a component arrangement | positioning figure at the time of the handset telephone call of a 1 axis hinge mechanism. It is a component arrangement | positioning figure at the time of hands-free telephone call of a 1 axis hinge mechanism. It is component arrangement drawing of a 1 axis hinge mechanism. It is a figure which shows the folding procedure (rotating axis A) of a biaxial hinge mechanism. It is a figure which shows the folding procedure (rotary axis B) of a biaxial hinge mechanism. It is a component arrangement | positioning figure at the time of the handset call in the state which does not fold a biaxial hinge mechanism. It is a component arrangement | positioning figure at the time of the hands-free call in the state which a 2 axis hinge mechanism is not folded. It is component arrangement drawing of microphone A1 and receiver A2 in the state where the biaxial hinge mechanism was folded. It is a figure which shows the time of the handset call which has arrange | positioned receiver B4 in the state which the biaxial hinge mechanism was folded. It is a figure which shows the time of the hands-free call in the state which folded the biaxial hinge mechanism. It is component arrangement drawing of a biaxial hinge mechanism. It is a figure which shows the time of the handset call which has arrange | positioned microphone B5 in the state which the biaxial hinge mechanism was folded. It is component arrangement | positioning at the time of arrange | positioning microphone B5 in the state which the biaxial hinge mechanism was folded. FIG. 6 is a component arrangement diagram when the microphone B5 is arranged in a state where the biaxial hinge mechanism is not folded. It is a block diagram which shows the circuit structure of the principal part of a prior art example. 23 is a flowchart showing a control operation of a control LSI in the control circuit shown in FIG.

Explanation of symbols

  1 microphone A, 2 receiver A, 3 speaker, 4 receiver B, 5 microphone B, 6 control LSI, 7 CODEC IC, 8 amplifier 1, 9 amplifier 2, 10 SW1, 11 SW2, 12 inverter, 13 SW3.

Claims (3)

A portable phone terminal that can be used by switching between a handset mode in which a user holds a phone call and a hands-free mode in which a user can make a phone call without holding the phone,
A speaker that outputs the received audio signal as audio, and a dual-purpose speaker that is used both in the handset mode and in the hands-free mode;
A first amplifier for amplifying the audio signal and outputting it from the dual-purpose speaker in the hands-free mode;
A second amplifier for amplifying the audio signal and outputting it from the dual-purpose speaker in the handset mode;
Control is performed to amplify the audio signal by the first amplifier at a first amplification factor that provides a volume at which the user can hear the audio volume output from the dual-purpose speaker in the hands-free mode in the hands-free mode. And a control means for performing control to amplify the audio signal by the second amplifier at a second amplification factor smaller than the first amplification factor during the handset mode,
The second amplifier is a low-volume amplifier that drives a small volume compared to the first amplifier, and is a low-noise amplifier that suppresses a static noise level. A portable phone terminal. A first circuit state for bringing the first amplifier and the dual-purpose speaker into a conductive state and a non-conductive state between the second amplifier and the dual-purpose speaker; and the second amplifier and the dual-purpose speaker. Circuit state switching means for switching between the first circuit and the second circuit state in which the first amplifier and the dual-purpose speaker are in a non-conductive state while being in a conductive state;
The control means controls the circuit state switching means to the first circuit state in the hands-free mode, and controls the circuit state switching means to the second circuit state in the handset mode. The portable telephone terminal according to claim 1.   The portable telephone terminal according to claim 1 or 2, wherein the control means executes control by software.

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