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JP2004221806

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DESCRIPTION JP2004221806
The present invention provides a communication device including a circuit for detecting a
distance between a user and a telephone and ambient noise, and automatically controlling
volume control and switching of an ear receiver and a speakerphone of the telephone.
SOLUTION: A distance sensor 18 for detecting a distance between a user 8 and a telephone 5,
and a noise detection microphone 19 for detecting a noise around a receiver are used. Distance
information detected by distance measurement, detection by noise detection Based on the noise
level information, the volume of the ear receiver 14 and the speakerphone 16 is optimized, and a
circuit is provided to automate the switching from the ear receiver 14 to the speakerphone 16.
[Selected figure] Figure 1
Communication equipment
TECHNICAL FIELD The present invention relates to an ear receiver and a speaker phone provided
in a cordless handset of a household cordless telephone and a mobile phone, etc., and volume
control during a call, switching to the ear receiver and the speaker phone It relates to the
operation. 2. Description of the Related Art In conventional cordless telephones (in the handset
side) and portable telephones, the user manually adjusts the volume control of the ear receiver
during a call and the switching operation to the speakerphone by the operation button of the
main unit. I had to operate. These are troublesome operations for beginners who are not used to
the operation of telephones and for elderly users, and especially in recent mobile telephones,
operations using soft keys are mainstream, operation with devices is different, and further
operation is required for operation. It has become On the other hand, Japanese Unexamined
Patent Publication No. 5-199289 describes a technique for eliminating such inconvenience by
automatically controlling the volume according to the distance between the telephone and the
user. It is done. Japanese Patent Application Laid-Open No. 5-167663 discloses a technique for
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switching from a normal handset to a microphone and a speaker when the output of the noise
measurement means exceeds a predetermined level. Further, Japanese Patent Application LaidOpen No. 5-83353 discloses a technique for adjusting the sound output of one of a receiver or a
speaker selected in advance according to the output of the noise measurement means. Patent
Document 1: Japanese Patent Application Laid-Open No. 5-199289 Patent Document 2: Japanese
Patent Application Laid-open No. 5-167663 Patent Document 3: Japanese Patent Application
Laid-Open No. 5-83353 However, in the above-mentioned prior art, only the distance detection
or the switching of the sound generation means or the volume control by only the ambient noise
is not taken into consideration, the other one having a large influence on the ease of hearing.
There was a problem that it was enough. SUMMARY OF THE INVENTION In order to solve the
above problems, a communication device according to the present invention comprises an ear
receiver, a speakerphone having a volume generation capability larger than that of the ear
receiver, and the ear receiver. The ear based on a distance detection unit for detecting the
distance of the caller, a noise detection unit for detecting ambient noise, distance information
detected by the distance detection unit, and ambient noise information detected by the noise
detection unit And a control unit configured to adjust the volume of the receiver and / or the
speakerphone. BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present
invention will be described with reference to FIGS. 1 to 9 in the case of a portable telephone.
FIG. 1 is a schematic block diagram of this embodiment. The portable telephone according to the
present embodiment is provided with an ear receiver 14 (receiver) used for a normal call and a
speakerphone 16 built in the portable telephone 5 as a pronunciation means. Further, in the
mobile telephone of this embodiment, at the time of reception, the radio wave of the mobile
telephone network 9 is received by the antenna unit 10, and the call control unit via the radio
signal processing unit 11 (hereinafter referred to as RF unit) performing reception processing,
demodulation and the like A signal is sent to 12. At the time of transmission, the voice signal of
the user input from the microphone 15 is sent to the call control unit 12, further modulated to a
transmission frequency by the RF unit 11, and transmitted from the antenna unit 10 to the
mobile telephone network 9. The call control unit 12 is connected with a number button 6 and a
center cross button 7 for performing other operations, and performs operations such as function
setting of a telephone, input of a telephone number, adjustment of volume, and setting of ringing
tone. When the received sound is output by the ear receiver 14 or the speakerphone 16, the
volume is set or a switching instruction input is performed. The above-described portable
telephone comprises a distance detection circuit 17 and a distance sensor 18 for detecting the
distance between the telephone set 5 and the user 8, and sends the detected distance information
to the call control unit 12. Furthermore, a noise detection microphone 19 for detecting ambient
noise and a noise detection circuit 41 are provided separately from the conversation microphone
15 in order to detect ambient noise level at the time of conversation, and the noise level It is
supposed to be sent to Based on the distance detection and the noise detection information, the
volume of the ear receiver 14 or the speakerphone 16 can be controlled and automatically
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adjusted. Further, the detection indicator 44 is provided in an easy-to-see place of the main body,
and the case of distance detection priority and the case of noise detection priority are colorcoded and displayed to show the user how it is detected. It can be checked whether the volume
setting matched with is made. First, volume adjustment with distance detection priority will be
described. FIG. 2 shows the configuration of the distance detection unit centered on the distance
detection circuit 17 and the distance sensor 18. A light emitting element 31 and a light receiving
element 32 are built in the distance sensor unit 18. Infrared light is emitted from the light
emitting element 31 to the user 8, and the light reflected from the user 8 is received by the light
receiving element 32. A signal of the light intensity detected by the distance sensor 18 is sent to
the distance detection circuit 17. The information sent here is converted into numerical data, and
is further sent to the call control unit 12. The call control unit 12 performs volume control and
switching control of the ear receiver 14 and the speakerphone 16 connected thereto.
For example, when the reflected light from the user 8 is strong, it is considered that the user 8 is
near the mobile phone, and the volume of the ear receiver 14 or the speakerphone 16 is
maintained at the current value (initial value) Do. On the other hand, when the amount of
reflected light becomes weak, the user 8 is away from the telephone main body 5, and the
volume of the ear receiver 14 is increased or switched to the speakerphone 16 to make a call
voice. Make it easy to hear If it is determined that the distance is extremely long, or if the
distance can not be detected, after detecting the distance for a certain period of time, the
detection operation is stopped, the call is ended, and the standby state is set. After the call ends,
the volume setting returns to the initial state (for example, the speakerphone is off, and the
volume of the ear receiver is a standard value). As shown in FIG. 3, since the distance to the user
is the easiest to measure, and difficult to hide when held by the hand, the mounting position of
the distance sensor 18 is at the center of the operation surface (surface) of the mobile phone. In
order to prevent an erroneous operation of distance measurement and arrangement, the
irradiation angle is about 20 degrees in the vertical and horizontal directions. If this angle is too
wide, infrared rays will be reflected to people other than the user, and the accuracy of distance
detection will deteriorate. Next, a volume adjustment sequence based on distance detection by
the distance sensor 18 will be described with reference to FIG. First, initialization is performed
immediately after the start of a call (S1), and then distance determination is performed (S2). The
distance detected here is compared with a predetermined first threshold L1 (S3). If the detected
distance is small (S3-no), adjustment of the detected volume is necessary, the volume is adjusted
stepwise by a predetermined level, for example, 2 dB step by step, and sound is generated from
the receiver phone 14 (S4). If the detected distance is larger than the threshold L1 (S3-yes), the
detected distance is compared with the second threshold L2 (S5). When the detection distance is
smaller than L2 (S5-no), the ear receiver 14 and the speakerphone 16 are each sounded at a
volume according to the detection distance (S6). If the detection distance is larger than L2 (S5yes), the sound generation means is switched from the ear receiver to the speaker phone (S7).
Furthermore, the volume after switching is also adjusted to a volume that the user can easily hear
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in the same manner as in the case of the ear receiver (S8). After the adjustment of the volume, it
is determined whether or not the call is closed (S9). If not, the difference between the previous
volume and the previous volume is detected (S10). It is determined whether the volume
difference exceeds or exceeds a predetermined threshold (S11), and if it does not exceed (S11no), it is determined whether the detection interval is the maximum value or not (S13), If not the
maximum (S13-no), the detection interval is increased (S14).
If the volume difference exceeds the predetermined threshold (S11-yes), the time interval for
measuring the distance is returned to the initial value (S12). Alternatively, the measurement time
interval is shortened by a predetermined amount. Thereafter, the process returns to the distance
determination (S2) again, and the subsequent steps are repeated until the call is ended. After the
end of the call, the volume setting of the telephone set should be the initial setting (for example,
the speakerphone is off, and the volume of the ear receiver is standard). In the above, when the
detection distance is between the threshold L1 and the threshold L2, the sound generation
amount is set and the ear receiver 14 and the speakerphone 16 are generated by the same
processing method as in the individual case, and the distance Even if there is a slight fluctuation
or the direction of the mobile phone and the user's ear deviates from the expected state, it can be
clearly heard. Next, volume adjustment based on noise detection will be described. Locations
using mobile phones generally have a high usage rate in environments where there is a lot of
ambient noise, such as in the outdoors or in transportation (cars, trains). Even if the volume is
sufficiently audible in a quiet room, the sound pressure may be low at the same volume setting in
the above place and it may be difficult to hear. Further, when transmitting the contents of a
telephone to a plurality of parties, it is more convenient to switch from the ear speaker to the
speaker phone and use it. According to the present invention, as described above, it is possible to
automatically set the sound volume when used in a place where ambient noise or noise that may
be disturbed during a call is loud, or when listening to the contents of a plurality of calls. FIG. 5 is
a block diagram showing the noise detection unit. The noise detection unit includes a noise
detection microphone 19 that picks up noise, a band pass filter 20 that controls the voice band of
the noise, a band amplification circuit 43, and a noise detection circuit 41 that converts the noise
level into numerical data. First, the flow of signals will be described. The noise picked up by the
noise detection microphone 19 is band corrected by the band pass filter 20 and the band
amplification circuit 43. This is to pass only a band (for example, 100 Hz to 1 kHz) that is easily
perceived as noise during a call and to increase the sensitivity of noise detection. Thereafter, the
noise detection circuit 41 converts the noise level into numerical data, and sends the numerical
data to the call control unit 12. The magnitude of the noise level is known from the numerical
data to be input, and the volume of the ear receiver 14 or the speakerphone 16 connected to the
call control unit 12 is adjusted by the magnitude. As shown in FIG. 6, the position of the noise
detection microphone 19 is attached to the back of the telephone main body 5 in order to make
it easy to pick up ambient noise, and an omnidirectional microphone is used to pick up a wide
range of noise.
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Here, the band correction unit configured by the band pass filter 20 and the band amplification
circuit 43 will be described in detail. The voice band of the other party during the call generally
has a bandwidth of 100 Hz to 3 kHz. This band is the most necessary band in a call, and the
other bands are regarded as noises which are not particularly required. For example, the
frequency component in an environment where noise of a car is severe is often 500 Hz or less,
and it is detected as a noise component by passing the above-mentioned band pass filter 20. A
band-corrected noise signal is sent from the band correction unit to the call control circuit 12.
Since the level of the band detected as the noise is amplified and sent to the noise detection
circuit 41, the noise detection sensitivity can be increased. The noise detection circuit 41 can
convert into numerical data according to the noise level detected above, and can adjust the
volume of the ear receiver 14 or the speakerphone 16 whose numerical data is connected to the
call control unit 12. Next, a noise detection sequence will be described with reference to FIG.
When the cellular phone is in a call state, various parameters are initially set (S21), and noise
after a predetermined time from the start of the call is detected (S22). The sound volume to be
output from the sound generation means is set based on the detected noise level (S23). The
volume setting level is compared with a predetermined reference level A (S24). If the volume
setting level is lower than the reference level A, the ear receiver 14 is driven at the setting level
(S25). On the other hand, if the volume setting level is higher than the reference level A, it is
compared with a reference value (level B) higher than the reference level A (S24). When the
volume setting level is lower than the level B (S26-no), the ear receiver 14 and the speakerphone
16 are simultaneously driven by the respective outputs corresponding to the setting level (S27).
On the other hand, when the volume setting level is higher than the level B (S26-yes), the
speakerphone 16 is switched (S28). When switching to the speakerphone 16, it is determined
whether the input value corresponding to the sound generation setting level is larger or smaller
than the allowable input of the speaker (S29). If it is smaller than the allowable input (S29-no),
the drive of the speakerphone 16 is continued at the set volume (S31), and if it is higher than the
allowable input (S29-yes), the allowable maximum value is set ( S30) The drive of the
speakerphone 16 is continued (S31).
The determination as to whether the drive is performed by the ear receiver 14 or the drive by the
speakerphone 16 is repeated until the process after the noise measurement (S22) is not ended
(S32-no), and the operation is ended (S32-). yes), set back to the initial state. In the above noise
detection, it is conceivable that the user's voice itself during a call is erroneously detected as
noise, but in the present invention, this erroneous detection is performed by using the following
means. It can be prevented. The means for discriminating between the user's voice and the
ambient noise during a call will be described below. In general, noise is anxious only when the
other party's voice is being output from the ear receiver or speakerphone during a call, that is,
when the user is listening to the other party's "voice" (at the time of reception). On the other
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hand, when the user speaks by speaking "voice" (when transmitting), the other party's voice is
not heard, so there is little concern about the noise around. From this fact, noise detection is
performed only at the time of reception, and when it is not performed at transmission, the voice
emitted by oneself is not detected as noise. This will be described with reference to FIG. FIG. 9
shows a case where the distance between the user and the telephone is close, for example as
shown in FIG. At the time of transmission, the input sound pressure of the microphone 15 for
speech becomes larger than the input sound pressure of the noise detection microphone 19. The
sound pressure level comparison circuit 22 compares the sound pressure levels of the speech
microphone 15 and the noise detection microphone 19 and outputs the "H" voltage when the
speech microphone 15 side is large. When the output of the sound pressure level comparison
circuit 22 is "H", the noise detection 41 is turned "off", and only the distance detection is
detected. Volume control of the ear receiver 14 connected to the call control circuit 12 and the
speakerphone 16 is control in distance detection. As shown in FIG. 9, when the distance between
the user's face and the telephone is close and no change in distance occurs, the change in volume
does not occur and the call volume setting in the initial state is made. If the distance between the
user and the telephone is close and the receiver is listening (listening to the other party's talk),
the noise detection microphone 19 is more than the sound pressure of the call microphone 15,
contrary to the above transmission. Since the voltage becomes large, the sound pressure level
comparison circuit 22 outputs an "L" voltage to turn on the noise detection 41. At this time, the
noise level input from the noise detection microphone is detected, and the volume adjustment is
performed by the noise detection sequence as described above with reference to FIG. As
described above, since it is possible to distinguish between transmitting and receiving based on
the voltage of "H" or "L" output from the sound pressure level comparison circuit 22, the
erroneous detection of noise described above is prevented. I can do things.
Next, when the user talks at a position away from the telephone main body, it is difficult to
distinguish between the user's voice and the surrounding noise. In this case, only the distance
information by the distance detection is detected, and the noise detection is set to "off". As a
means for detecting only the distance, when the amount of change in the fixed time of the
distance sensor 18 exceeds the set reference value, the "H" voltage is sent from the distance
detection unit 18 to the noise detection unit 41. The noise detection circuit 41 having received
"H" is turned "off" as described above, and noise detection is not performed. The speakerphone
volume when the distance between the user and the telephone set is greater than a
predetermined distance is set to be larger than the initial value by the above-described distance
detection. It is adjusted to the easy state. When the operation of distance detection is applied and,
for example, a plurality of users want to check the contents of a call, the speakerphone is
switched by distance detection by placing the telephone main body at a position immediately
after the start of the call. Because it is performed, it is possible to make a sound from the
speakerphone without performing the main unit operation. Further, a detection operation
indicator 44 is provided at a prominent position of the telephone main body 5 so that it can be
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recognized which detection means is currently used to adjust the volume. For example, "red" may
be color-coded when the distance is detected, and "orange" may be lighted when the noise is
detected. As shown in FIG. 6, the noise detection microphone 19 is installed on the back surface
of the mobile phone (outside with respect to the talker opposite to the operation surface), and an
omnidirectional microphone is used as the detection microphone. In the case of unidirectionality,
accurate detection can not be made unless the back of the main body is directed to the source of
noise, but in the case of nondirectionality, a wide range of sound can be detected and the
direction of the noise detection microphone 19 This is because the noise can be detected without
directing the back side to the direction of the noise source. As described above, it is preferable to
include the microphone 15 for noise detection in terms of measurement accuracy, but if accuracy
is not required, the user does not utter the input from the microphone for transmission. It is
possible to use as a noise detection part by adopting a level at or below a predetermined level
determined to be as a noise level. As described above, if distance detection and noise detection
are performed separately, the error in the setting value of the audio output tends to be large, so it
is preferable to evaluate two parameters simultaneously and set the required audio output. .
Audio output is set to satisfy the following conditions. (1) The sound pressure when the voice
emitted from the mobile phone reaches the user's ear is higher by a predetermined level (dB) or
more than the noise at the time of measurement. (2) The sound pressure when the voice emitted
from the mobile phone reaches the user's ear is a predetermined level that is easy for ordinary
people to listen to. (3) The maximum allowable output of the sound producing means (ear lover
or speakerphone) is not exceeded. According to the above principle, it is necessary to set the
voice output to estimate the reduction in sound pressure due to the distance between the
portable telephone sounding means and the user, but for example, it is constant up to a
predetermined distance. From then on, a relational expression that is inversely proportional to
the square of the distance may be defined, and the sound pressure of the sound felt by the user's
ear may be estimated by that expression. A method of switching between the ear receiver and the
speakerphone and adjusting the output based on the above-mentioned concept will be described
based on the flowchart of FIG. First, after the start of a call, the mobile phone is set to an initial
state (S31), and after a certain time, the distance between the mobile phone sound generation
means and the user and the ambient noise are measured (S32). From the measured value, the
sound generation amount is set (S33). The set sound production amount is compared with a
predetermined reference value C to determine whether the sound production amount setting
level is equal to or higher than the switching level C (S34). If the sound generation amount
setting level is lower than the switching level C (S34-no), the ear receiver 14 is driven at the
sound generation amount setting level. If the sound generation amount setting level is equal to or
higher than the switching level C (S34-yes), the level D is compared with a level D higher than the
level C. If the sound generation amount setting level is lower than the switching level D (S36-no),
the ear receiver 14 and the speakerphone 16 are driven with respective outputs corresponding
to the setting level (S37). If the sound generation amount setting level is higher than the
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switching level D (S36-yes), the speakerphone is switched (S38), and the sound generation
amount setting level is compared with the speakerphone allowable level (S39). If the sound
generation amount setting level is higher than the allowable level of the speakerphone (S39-yes),
the sound generation amount set level is set to the allowable maximum value (S41), and the
speakerphone is driven (S40). If the sound generation amount setting level is lower than the
allowable level of the speakerphone (S39-no), the speakerphone is driven at the sound
generation amount setting level (S40). At the volume set as described above, the end of the call is
determined while continuing the driving of the ear receiver or the speakerphone (S 42).
When the call is ended (S42-yes), the setting is returned to the initial state and the call is ended.
When a call continues (S42-no), the difference between the volume setting level at that point and
the previous volume setting level is further detected (S43), and when smaller than a
predetermined threshold (S43-no), the step It is determined whether the time interval of
repetition of detection and setting starting from 32 is the maximum value (S46). If the repetition
interval is the maximum value (S46-yes), the detection is continued at the same interval, and if it
is not the maximum value (S46-no), the interval is increased (S47). If the volume setting level
difference determination (S44) is larger than the predetermined threshold (S44-yes), the
detection interval is set to the initial value (S45). At this time, the repetition interval may be
shortened by a predetermined time. After this, the process returns to the distance and noise
determination (S32) described at the beginning, and the subsequent steps are repeated until the
closing. According to the communication device of the embodiment, a distance measurement unit
for detecting the distance between the user 8 and the telephone 5 and a noise detection unit for
detecting the ambient noise when used are provided. The call quality can be improved by
adjusting the volume and switching control of the ear receiver and the speakerphone in
combination. In addition, the above-mentioned call volume adjustment and the switching
operation to the speaker phone, which were manually operated by the user themselves, can be
automated, and operability can be improved. According to the communication device of the
present invention, the call quality can be improved. BRIEF DESCRIPTION OF THE DRAWINGS FIG.
1 is a block diagram of a communication device including a distance detection circuit and a noise
detection circuit, which are features of an embodiment. FIG. 2 is a block diagram showing a
distance detection unit which is one of the features of the embodiment. FIG. 3 is a view showing
an installation position of a distance detection sensor, an installation position of a detection
indicator, and the like which are one of the features of the embodiment. FIG. 4 is a flowchart
illustrating a volume adjustment sequence based on distance detection, which is one of the
features of the embodiment. FIG. 5 is a block diagram showing a noise detection circuit which is
one of the features of the embodiment. FIG. 6 is a view showing an installation position of a noise
detection microphone which is one of the features of the embodiment. FIG. 7 is a diagram
showing a state in which the user brings the telephone main body closer to one another
according to an embodiment of the present invention. FIG. 8 is a flowchart illustrating a volume
adjustment sequence based on noise detection, which is one of the features of the embodiment.
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FIG. 9 is a block diagram for explaining a volume adjustment method by distance detection and
noise detection, which is a feature of the embodiment;
FIG. 10 is a flowchart in the case where the volume adjustment, which is a feature of the
embodiment, is implemented by combining the two methods of distance detection and noise
detection. [Description of the code] 5: mobile phone body, 8: user, 9: mobile phone network, 10:
antenna, 11: RF unit, 12: communication control unit, 14: ear receiver, 15: microphone, 16:
speaker Phone 17, 17, distance detection circuit, 18: distance sensor, 19: noise detection
microphone 20: band limit filter (band pass filter), 22: sound pressure comparison circuit, 23:
transmission / reception switching circuit, 31: light emitting element, 32: light receiving element,
41: noise detection circuit, 43: band correction circuit, 44: detection operation indicator
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