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DESCRIPTION JPH07202998

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DESCRIPTION JPH07202998
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
telephone having an ambient noise removing function capable of making a comfortable call even
in an environment susceptible to reception noise interference, and is particularly suitable for use
in a portable telephone or the like.
[0002]
2. Description of the Related Art For example, in Japanese Patent Application Laid-Open No. 193244, a telephone set assumed to be used in situations where there is a lot of ambient noise, is
disclosed, for example, in There has been proposed a method of reducing the influence of the
sound quality deterioration of the received voice by attenuating the surrounding noise by the
insertion loss. However, this method can not reduce the noise reaching the ear of the receiver
directly from the surroundings.
[0003]
Therefore, when reaching the ear, it is conceivable to generate and generate a signal having a
phase opposite to that of the arrival noise and cancel it with the ambient noise to maintain the
sound quality of the received voice. A configuration diagram of this conventional example is
shown in FIG. In this conventional example, the noise removing error sound collecting
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microphone 4 is disposed as close as possible to the receiving speaker 2 on the upper part of the
receiver 1 to which the receiver's ear 6 is to be put. Also, at the rear of the receiver 1, a
microphone 3 for ambient noise collection is disposed. The output signals of these microphones
3 and 4 are input to the noise removal processing unit 5 inside the handset. The noise removal
processing unit 5 is configured by an adaptive filter, and performs filtering processing on an
input signal from the microphone 3 to generate a canceling signal for ambient noise, and outputs
this signal from the reception speaker 2. Ambient noise is canceled at the position of the ear 6 of
the receiver. Also, the input signal from the microphone 4 is used as a noise removal error signal.
This reduces the influence of ambient noise on the received speech.
[0004]
However, in the conventional telephone set, since it is necessary to arrange the receiving speaker
2 and the noise removing error sound collecting microphone 4 in the portion where the ear of
the receiver 1 is in contact, the same speaker having the same output characteristics In the case
of using the telephone, the receiver inevitably becomes large. Conversely, when the size of the
receiving section is not changed, as shown in FIG. 4A, a speaker having a small effective
diaphragm area S1 must be used, and the sound quality of the receiving voice is degraded. The
symbol A indicates the space occupied by the speaker 2 and the microphone 4. Further, in this
structure, the position at which the microphone 4 is disposed is at the periphery of the ear 6, so
there is a problem that the noise removal error signal can not be obtained accurately.
[0005]
The present invention has been proposed to solve the problems of the prior art as described
above, and the noise removal error signal can be obtained accurately, so that ambient noise can
be reduced well for received speech, and further, An object of the present invention is to provide
a telephone whose receiver does not become large.
[0006]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
according to claim 1 is characterized in that, in the receiver, the coaxially centered position of the
receiving speaker in the receiver unit is placed integrally on the speaker portion. A first
microphone for noise removal error with directional directivity, a second microphone attached to
an arbitrary position of the receiver and picking up ambient noise, and an input signal from this
second microphone Filtering processing to generate a noise canceling signal and output it from
the speaker for reception as well as noise by an adaptive filter that uses the input signal from the
first microphone as a noise removing error signal for changing the coefficient of the filter The
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configuration has a removal processing unit.
[0007]
Further, in the present invention according to claim 2, the second microphone is also used as a
transmitting microphone provided in the receiver.
[0008]
According to the configuration described above, ambient noise can be canceled by outputting the
noise canceling signal generated by the noise removal processing unit from the above-mentioned
speaker for receiving speech.
[0009]
In addition, since the first microphone for noise removal error sound collection is integrated with
the speaker coaxial type microphone coaxially with the receiver speaker, the part corresponding
to the ear of the receiver is about the outer diameter of the receiver speaker The noise
cancellation effect can be expected even if the position of the ear shifts.
[0010]
Also, by using the second microphone for collecting ambient noise as the transmitting
microphone, it is not necessary to separately attach the second microphone to the receiver.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the
present invention will be described in detail with reference to the drawings.
FIG. 1 shows a block diagram of a handset to which the present invention is applied.
In the receiver 1 of the embodiment shown in this figure, the noise removal error sound is made
to have directivity in the direction of the ear 6 at the coaxial center position of the receiving
speaker 2 disposed at the front position of the upper part to which the ear 6 The sound pickup
microphone 4 is assembled into an integral structure.
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Thus, the microphone 4 corresponding to the first microphone is configured as a speaker coaxial
microphone.
In addition, the ambient noise pickup microphone 3 corresponding to the second microphone is
attached to the upper rear of the receiver 1 with its outside directed.
[0012]
In addition, the noise removal processing unit 5 configured by an adaptive filter is incorporated
on the circuit inside the receiver 1, and the noise removal processing unit 5 includes the ambient
noise pickup microphone 3 and the noise removal error sound. An output signal from the sound
pickup microphone 4 is input.
Further, in FIG. 1, 7a is a transmitting microphone.
[0013]
As described above, in this telephone set, since the noise removal error sound collection
microphone 4 is configured as a speaker coaxial microphone, the space A occupied by the
reception speaker 2 and the microphone 5 does not have an ambient noise removal function. It
can be sized the same as a telephone handset.
Furthermore, as shown in FIG. 4B, the effective diaphragm area S2 of the receiving speaker 2 can
be made the same as in the case of only the speaker in which the microphone is not disposed,
and the frequency characteristics of the receiving speaker 2 can be improved.
[0014]
Next, the ambient noise removal operation will be described. Ambient noise reaching the ear 6
applied to the receiver 1 of the receiver is input to the ambient noise pickup microphone 3. This
ambient noise simultaneously enters the ear 6 of the receiver and is felt as noise.
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[0015]
The noise removal processing unit 5 uses the input signal from the microphone 3 as a reference
signal of the adaptive filter, and performs a filtering process on the reference signal to create a
noise cancellation signal of the reception section. This canceling signal is output from the
receiving speaker 2 and reaches the receiving person's ear as a canceling sound. At this time,
components of the negative phase with respect to the ambient noise are canceled out, and the
rest remain. The remaining sound is picked up by the noise removal error sound collection
microphone 4 having a coaxial structure with the speaker 2 and is input to the noise removal
processing unit 5. This input signal is used as a denoising error signal for updating the
coefficients of the adaptive filter by subtracting the T-delayed received speech signal. Here, T
time corresponds to a delay time until a received voice is emitted from the speaker 2 and
collected by the microphone 4 and input to the noise removal processing unit 5.
[0016]
By repeating the above processing, the adaptive filter operates in the direction to reduce the
noise removal error, and ambient noise is removed at the position of the ear 6 of the receiver. At
this time, since the noise removing error sound pickup microphone 4 has directivity so as to face
the center of the ear 6 of the receiver, a noise removing error signal with high accuracy can be
obtained.
[0017]
Next, another embodiment shown in FIG. 2 will be described. In this embodiment, the ambient
noise pickup microphone 4 is not provided at the rear of the receiver 1, but is also used as a
transmitting microphone 7 disposed at the lower front of the receiver 1, and ambient noises are
collected by this microphone 7. Then, it is input to the noise removal processing unit 5.
[0018]
The present invention is applicable not only to general telephones, but also to mobile telephones
used outdoors where there are many ambient noises, and great effects can be expected.
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[0019]
As described above, according to the present invention, the noise eliminating error sound
collecting microphone is configured as the speaker coaxial microphone, so that the microphone
is always arranged at the optimum position when the telephone is used. Therefore, the noise
removal error signal can be accurately obtained, and the ambient noise removal operation can be
stabilized.
As a result, it is possible to prevent the deterioration of the speech quality due to the influence of
ambient noise, and to make a comfortable speech even under noise. Further, by putting the noise
removal error sound collection microphone in the speaker, the effective diaphragm area of the
transmission speaker does not become small, and the deterioration of the sound quality of the
received voice can be prevented. Further, unlike the conventional case where the noise removing
error sound pickup microphone is disposed close to the transmitting speaker, the area occupied
by the speaker and the microphone can be reduced, and the telephone can be miniaturized.
Further, by using the transmitting microphone and the ambient noise collecting microphone in
common, it is not necessary to separately attach an ambient noise collecting microphone to the
receiver, and the number of parts can be reduced.
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