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DESCRIPTION JP2002152625

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DESCRIPTION JP2002152625
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio reproduction apparatus, and more particularly, a transmission unit is provided near a
sound source such as a television (television) to transmit an audio signal from the sound source
cordlessly and listening away from the sound source The present invention relates to an audio
reproduction apparatus configured to receive and reproduce the audio signal at a reproduction
unit near the user.
[0002]
2. Description of the Related Art As an apparatus of this type, an apparatus described in Utility
Model Registration No. 3053680 is known. That is, audio is converted to an infrared signal from
a transmitting device connected to the earphone terminal of the television and transmitted,
received by a receiving device, demodulated and reproduced as audio, and the television is
viewed at a large volume such as at night When I can not do it, and for the elderly with a distant
ear again, I was made to be able to output voice at the ear.
[0003]
By the way, in the above-mentioned conventional apparatus, the sound from the speaker of the
television disappears because the earphone terminal is used, and the television can not be
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enjoyed in plurals (for example, with the whole family). For this reason, the applicant has
developed an apparatus for extracting and transmitting an audio signal from an audio output
terminal (pin terminal) of a television instead of an earphone terminal, and reproducing the audio
signal in a receiver. In this way, for example, when the elderly with distant ears watch the
television with the family, by putting the playback device in the elderly ear, everyone can enjoy
the television together at the normal volume.
[0004]
However, some TVs used in general homes with an audio output terminal have not been widely
used. Therefore, the applicant considered that the sound output from the sound source (speaker)
of the television should be collected by the microphone and transmitted to the receiving
apparatus to be reproduced again, so that it can be used for any television. The As a result, even
if the audio output terminal is not attached, the sound of the television can be reproduced by the
receiving device, and the elderly can enjoy the television together with the family as described
above. However, it was not easy to obtain a noise-free and easy-to-hear voice from a speaker that
is originally a vibration source. Therefore, an object of the present invention is to provide an
audio reproduction apparatus capable of easily obtaining an easy-to-hear speech without noise.
[0005]
SUMMARY OF THE INVENTION In the present invention, a transmission unit is provided near a
sound source such as a television, and the audio signal from the sound source is transmitted in a
cordless manner, and the audio signal is transmitted by a reproduction unit near the listener
apart from the sound source. An audio reproduction apparatus configured to receive and
reproduce an audio signal, the transmission unit at least including a low sensitivity microphone
attached to a sound source, and a transmitter for transmitting an output signal from the
microphone in a cordless manner; The reproduction unit receives a signal from the transmission
unit and demodulates and reproduces it near the listener, and the transmission unit detects the
sound level collected by the microphone, and the detection unit detects the sound level. In order
to solve the above-mentioned problems, the present invention is characterized by comprising
means for notifying the voice level and means for fixing the microphone to an appropriate
position of a sound source.
[0006]
Here, the transmission unit includes a microphone unit provided with the microphone and fixed
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to a sound source, and a transmission unit provided with the transmitter and cord-connected to
the microphone unit and mounted on a housing of the sound source, etc. The transmitter may
convert the audio signal into infrared light and output it.
Also, the transmitting unit accommodates the microphone and the transmitter in one case, and
directly attaches the case to a sound source, and the transmitter converts an audio signal into a
radio wave and outputs it. Also good. The notification means outputs a notification when an
audio signal obtained by the low sensitivity microphone detects a level higher than a
predetermined level.
[0007]
According to the present invention, the microphone attached to the sound source can be used as
a low-sensitivity microphone that does not suffer from the surrounding sound or the vibration of
the sound source itself, so that noise can be collected with less noise. In addition, it is necessary
to attach a microphone to a portion where sufficient sound pressure can be obtained as much as
possible for low sensitivity. For this reason, a means for detecting the sound level collected by the
microphone, a means for notifying the detected sound level, and a means for fixing the
microphone to an appropriate position of the sound source are provided to detect and notify the
sound level. Therefore, based on this, it is possible to find a suitable position for sound collection
with high sound pressure and fix the microphone at that position.
[0008]
In addition, although the transmission unit and the reproduction unit can be communicated by
infrared rays, in this case, since communication can not be performed if there is an obstacle
between transmission and reception, the microphone unit and the transmission unit are
separated, and the microphone unit By fixing the sound signal to a position suitable for sound
collection according to the sound source, and by transmitting the sound signal to infrared light
by mounting the transmitter at an unobstructed position such as on the housing of the sound
source Can.
[0009]
Also, although the transmission unit and the reproduction unit can be communicated by radio
waves, in this case there is no need to pay particular attention to an obstacle between
transmission and reception, so the microphone unit and the transmission unit are integrated. It
can be attached directly to the sound source.
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[0010]
Although various devices (for example, lamps such as LEDs, sound meters such as level meters,
and buzzers) can be considered as the notification means, when the sound signal collected by the
low sensitivity microphone is at a predetermined level or more, notification output It is sufficient
to specify an appropriate installation position of the microphone while confirming the
notification output.
[0011]
Embodiments of the invention will be described below with reference to the drawings.
FIG. 1 is an explanatory view showing a use state of the first embodiment, and shows an example
in which the apparatus of the embodiment is attached to a television T and used.
In this embodiment, the microphone unit 1 is attached to the speaker S of the television T, the
transmission unit 2 is mounted on the housing of the television T, and the microphone unit 1 and
the transmission unit 2 are connected by the cord 3 to transmit the transmission unit 4 Are
configured.
The transmission unit 4 and the reproduction unit 5 transmit and receive audio signals by
infrared rays, and the reproduction unit 5 is used on a table or the like so that the infrared
signals from the transmission unit 2 can be reliably received. Ru. The reproduction unit 5 is
additionally provided with a storage case 6 capable of accommodating a remote control R of a
television, etc., and can be effectively used even when placed on a table. An operation unit 7 is
formed on the upper surface of the reproduction unit.
[0012]
FIG. 2 is an external view of the microphone unit 1 of the first embodiment, and FIG. 2 (a) is a
front side, and FIG. 2 (b) is a rear view. An LED lamp 8 is provided on the front side of the
microphone unit 1, and a microphone 9 and a magic tape (registered trademark) 10 for fixation
are provided on the rear side. The LED lamp 8 is turned on if the sound level (sound pressure) of
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the sound collected by the microphone 9 is above a certain level, and the microphone 9 is a
close-talking microphone of low sensitivity without noise from the surrounding area. The velcro
10 is for removably fixing the microphone unit 1 to the speaker S of the television. With such a
configuration, the microphone unit 1 is directly attached to the speaker S of the television, and
the sound from the speaker S is collected from the microphone on the back side of the
microphone unit 1.
[0013]
As described above, the microphone 9 is a low sensitivity close-talking type microphone, and in
order to collect only the sound from the speaker S of the television, it is desirable that the
microphone 9 be mounted at a position where the sound pressure of the speaker S is as high as
possible. Therefore, the microphone unit 1 can be attached while confirming the sound pressure
level based on the lighting state of the LED lamp 8. That is, when the method of attaching the
microphone unit 1 is described, the microphone 9 is brought close to the speaker S while sound
is being output from the speaker S with the television T turned on, and the sound pressure is
high in the speaker S, that is, the LED lamp A position where 8 is always lit is found, and the
magic tape 10 is attached to the position to fix the microphone unit 1.
[0014]
Incidentally, the microphone 9 is attached to the television speaker S directly, so it is placed in a
state where it is likely to cause howling although it has low sensitivity. For this reason, it is
desirable that the microphone itself have a sound collection characteristic that cuts off the
frequencies in the high range and the low range that are likely to cause howling. These measures
have a positive effect, especially in terms of the ease of hearing the voice for the elderly.
[0015]
FIG. 3 is a block diagram showing the configuration of the first embodiment. The transmission
unit 4 comprises the microphone unit 1 and the transmission unit 2 as described above, and the
microphone unit 1 is provided with the microphone 9, the microphone amplifier 11, the level
detection unit 12, and the LED lamp 8. Further, the transmission unit 2 is provided with the
modulation circuit 14, the infrared light emission unit 15, and the line input terminal 16. The
sound collected by the microphone 9 is amplified by the microphone amplifier 11, modulated by
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the modulation circuit 14, converted into an infrared light signal by the infrared light emitting
unit 15, and output. The level of the output of the microphone amplifier 11 is detected by the
level detection unit 12 and the LED lamp 8 is turned on if the amplitude of the audio signal is
sufficiently large and at a predetermined level or more.
[0016]
The line input terminal 16 obtains an audio signal from the earphone output terminal or the
audio output terminal of the television T and causes the infrared light emitting unit 15 to output
an infrared signal. When there is a signal input from the line input terminal 16, the modulation
circuit The microphone unit 1 is switched to the line side to acquire an audio signal. When you
want to stop the audio output from the speaker S and watch the television, you can connect it to
the earphone terminal, and if the audio output terminal is attached to the TV T, connect it to this
and you can connect it to the ear without using the microphone. Voice can be played back.
[0017]
The reproduction unit 5 is provided with an infrared light receiving unit 17, a demodulation
circuit 18, a speaker 19 and an operation unit 7. The optical signal output from the transmission
unit 4 is converted into an electric signal in the infrared light receiving unit 17, is demodulated in
the demodulation circuit 18, and the sound is reproduced from the speaker 19. Although not
shown in the figure, the operation unit 7 includes a power switch, a volume control knob for
adjusting the sound level from the speaker 19, and a bass range cut from the normal mode, for
example. A changeover switch or the like capable of selectively switching the mode is provided.
[0018]
The power supply of the transmission unit 4 and the reproduction unit 5 may use a 100 V
commercial power supply or a battery. In terms of usage, since the transmission unit 4 is fixed to
the television T, it is desirable to obtain power from a commercial power source via an adapter,
while using the battery since the reproduction unit 5 is portable. Is desirable.
[0019]
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The first embodiment is configured as described above, and by collecting the sound directly from
the speaker S of the television T with the low sensitivity close-talking microphone 9, it is easy to
hear unnecessary ambient noise without loss. Voice can be played back. In addition, since it is a
low sensitivity microphone, it is necessary to attach it to a position with as high sound pressure
as possible of the sound source, but by performing while checking the sound level with the LED
lamp 8, anyone can easily go to the appropriate position of the speaker S The microphone unit 1
can be attached. Further, since the audio signal is transmitted and received as an infrared light
signal from the transmission unit 4 to the reproduction unit 5, transmission with less extraneous
noise is possible as compared to radio waves.
[0020]
FIG. 4 is an explanatory view showing a use state of the second embodiment, and also shows an
example in which the device of the second embodiment is attached to the television T and used.
In this embodiment, the transmission unit 4 is attached to the speaker S of the television T, and
an audio signal is transmitted from the transmission unit 4 to the reproduction unit 5 by radio
waves (FM broadcast frequency band).
[0021]
FIG. 5 is an external view of the transmission unit 4 of the second embodiment, and FIG. 5 (a) is a
front side, and FIG. 5 (b) is a rear view. An operation unit 21 and an LED lamp 22 for sound level
notification are provided on the front side of the transmission unit 4, and a microphone 26 and a
magic tape 27 for fixation are provided on the rear side. The operation unit 21 is provided with a
power switch 23, a power LED lamp 24, and an output selector switch 25. The power switch 23
is turned on, and the selector switch 25 selects either "microphone input" or "line input". . If
"microphone input" is set, the signal collected from the microphone 26 is transmitted. The
microphone 26 is a low sensitivity, close-talking microphone similar to that of the first
embodiment, and the LED lamp 22 for audio level notification collects audio levels above a
predetermined level by the microphone 26 in the same manner as the LED lamp 8 of the
previous embodiment. It lights when it sounds.
[0022]
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The transmission unit 4 is directly attached to the speaker S of the television by the magic tape
27 and the sound from the speaker S is collected from the microphone 26 on the rear side of the
unit 4. The method for attaching the transmission unit 4 will be described. In a state in which
sound is emitted from the speaker S with the television T turned on, the transmission unit 4 is
brought close to the speaker S and the sound is collected by the microphone 26. A high position,
that is, a position where the LED lamp 22 is always lit, is found, and the velcro tape 27 is
attached to the position to fix the transmission unit 4.
[0023]
FIG. 6 is a block diagram showing the configuration of the second embodiment. In the
transmission unit 4, the audio signal collected by the microphone 26 is amplified by the
microphone amplifier 28, is FM modulated by the modulation circuit 29, and is transmitted from
the transmission antenna 30 as a radio wave signal (FM broadcast frequency band). The level
detection unit 31 detects the level of the output of the microphone amplifier 28, and the LED
lamp 22 is turned on if the amplitude of the audio signal is sufficiently large and at a
predetermined level or more. 32 is a line input terminal for obtaining an audio signal not from
the microphone 26 but from the earphone output terminal or the audio output terminal of the
television T. When the changeover switch 25 of the operation unit 21 is switched to "line input",
the line input terminal An audio signal from 32 is transmitted from the transmitting antenna 30
through the modulation circuit 29.
[0024]
The reproduction unit 5 is provided with a reception antenna 33, a tuning unit 34, a
demodulation circuit 35, a speaker 36 and an operation unit 37. The radio wave signal output
from the transmission unit 4 is received by the receiving antenna 33, and is demodulated by the
demodulation circuit 35 through the tuning part 34, and the voice is reproduced from the
speaker 36. The tuning unit 34 is for auto-tuning radio waves in the frequency band of ultra high
frequency waves, that is, FM broadcasts, and can also receive FM broadcasts in addition to the
radio waves from the transmission unit 4. Although not illustrated, the operation unit 37 is
provided with a power switch, a volume control knob for adjusting the sound level from the
speaker 36, and an automatic channel selection button, and when the automatic channel
selection button is pressed In addition to the signal from the transmission unit 4, it is possible to
tune and enjoy the FM broadcast in addition to the signal from the transmission unit 4.
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[0025]
The second embodiment is configured as described above. Here, since the audio signal is
transmitted and received between the transmitting unit 4 and the reproducing unit 5 by radio
waves, even if there is an obstacle between the units, the optical signal As a result, it is possible
to transmit and receive stable audio signals without being interrupted. In addition, it has a
channel selection function for received radio waves and can reproduce FM broadcasting etc. and
can be used widely.
[0026]
The present invention is not limited to the above embodiment, and various embodiments can be
considered without departing from the scope of the claims. In the above embodiment, one LED
lamp is provided as the notification means. However, a difference is provided between the levels
at which a plurality of LED lamps are turned on, and the light is turned on stepwise according to
the detected sound level. If so, it will be possible to more accurately identify the mounting
position of the microphone. In addition to the lamp, the notification means can use sound
notification means such as a well-known level meter or a buzzer.
[0027]
As is apparent from the above description, according to the present invention, the microphone
attached to the sound source is a low sensitivity microphone that does not catch the surrounding
sound or the vibration of the sound source itself, and thus less noise. Since sound collection can
be performed and reproduced by a reproduction unit placed at the ear, it is possible to obtain a
device that can be easily heard by the elderly. In addition, it is necessary to attach a microphone
to a portion where sufficient sound pressure can be obtained as much as possible because of low
sensitivity, but a means for detecting and notifying the sound level collected by the microphone
is provided, and the sound is A position suitable for high pressure sound collection can be found,
and the microphone can be easily fixed to the suitable position.
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