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JPS52122646

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DESCRIPTION JPS52122646
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a circuit diagram of an essential part of
the device of the present invention. FIG. 2 is a circuit diagram of an essential part of an external
speaker applied to the device of the present invention. FIG. 3 shows a circuit diagram of an
essential part of the filter circuit of FIG. FIG. 4 shows a circuit diagram of an essential part of
another embodiment of FIG. FIG. 5 is a diagram showing reproduction frequency characteristics
of a speaker applied to the device of the present invention. 1
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии иииии (Switch
connected to the changeover switch 11) switch.
DETAILED DESCRIPTION OF THE INVENTION T-dio signal writing device 2 of the audio device,
the range of the utility model registration request for audio signal passing through the
reproduction amplification thread path, any of the speaker provided in the audio device and the
speaker and another external speaker The sound device and the external speaker are set to be
selectively reproduced by one or the other! In addition to arranging a switch on the following
jacks, when reproducing an audio signal by both 11 + J speakers, the reproduction is performed
so that the frequency band of the audio signal to be reproduced is associated with any
reproduction frequency band of both the speakers. There is provided a switch for variably
controlling the amplification thread path KI III II wave number band, and the switch is Irll 111 :!
The audio signal reproduction device 08 of the audio equipment characterized in that the Lshaped switch which can respond to the turning switch, the invention 0 details are explained The
present invention tape recorder, talkie projection machine etc. ratio I fishing outer shape or
small, and The present invention relates to an improvement of an audio signal reproduction
apparatus in a blue tatami device in which (1) J- '-722j & 4 reproduction of an audio signal is
performed by a built-in speaker. In the case of a sound field device which is carried by a user
such as a tape recorder or a toque-projector, the sound field device is generally provided in a
speaker communication device in order to make the entire device compact. Of course, small size
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speakers are used in the configuration, and since the speakers are housed in a limited space, it is
extremely difficult to reproduce the bass range of the reproduced audio signal. Become. Because
of this, as required for ordinary blue tatami mat equipment The speaker in the Ill unit and the
speaker that is not particularly restricted from space apart from the speaker are selected, and
another speaker enables reproduction of an audio signal with a wide frequency band by another
speaker. However, in the case of the sound 1 device having the configuration of this kite, all
circuits which are intervened in the amplifier rumor reproduction amplification yarn path are at
least sufficiently wide than the reproduction frequency band of the speaker in the machine (2)
Because it is necessary to adapt to the wave number band, as a result, in the reproduction by the
speaker in the device, an audio signal biased to the high range will be laid down. On the other
hand, an alternative is the audio signal passing through the reproduction amplification system
mentioned above. In a sound device comprising a speaker in an audio device and a speaker other
than the speaker, ie, a speaker which is selectively reproduced by an external speaker, the
reproduction of both speakers using the frequency band of the reproduction amplification thread
path It provides an audio fiI audio device adapted to the frequency band, especially in the draft.
IIIIWIoo, the frequency band of the reproduction amplification thread can be automatically
reciprocated by the switch operated in conjunction with the selection operation of both speakers,
so the audio i signal reproduced by both speakers is always It can be balanced in the high and
low range. Hereinafter, an embodiment of the present invention will be described in detail with
reference to the drawings. (3) In FIG. 1, the reproduction amplification thread line of the sound
processing machine 111 is an audio signal input terminal. Speakers 51 provided in the front
stage, rear stage amplifiers 3 and 4 and the sound device l! Filter circuit 6.1 provided in the two
amplifiers 3 and 4! UII +: configured by the jack 7 provided between the post-stage amplifier 4
and the speaker 5. The jack 7? is engaged with the speaker 6 accommodated in the speaker pad
8 shown in FIG. 2 and a plug 10 connected to another speaker, ie, an external speaker 9. Father,
the changeover switch 11flI provided on the jack 7! An audio signal passing through the
reproduction amplification thread path is applied to one of the bending speaker 5 and the
external speaker 9 in accordance with the engagement of the plug Io. Connected to switch 12?
switching switch 11 to open and close l! ????? It is possible to make the filter circuit 6
substantially inoperable when it is fi11 protected by Il. Especially as filter circuit 6! ! ! It is
preferable to use a well-known high attenuation filter as shown in FIG. This is because, in the
reproduction of the audio signal by the speaker 5 provided with the sound 11111 [ilIK (4), it is
not reproduced before the low frequency due to the speaker and the limited space shape of the
speaker. Fig. 4 shows another practical example of Fig. 1 Anti-Italian period. The filter circuit 6 is
additionally provided to the negative feedback circuit U of the front stage or rear stage amplifier
3.4. The point is different from the above-described respective layer configurations, or there is no
particular difference in the pond tank forming member such as the switch ?. FIG. 5 is a
reproduction frequency characteristic diagram of the speaker for showing the action principle of
the one-apparatus device. FIG. 8 shows the frequency band of the audio signal reproduced by the
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speaker 6 provided in the acoustic device [1. 9 additional audio fake frequency band to be
reproduced! 3 shows the frequency characteristics of the audio signal reproduced by the speaker
provided in the conventional device which has not been subjected to the measures referred to in
the present device.
Next, the operation of the device of the present invention will be described with respect to the
conventional device (Shinka, etc.). In the case where reproduction is performed by the speaker 5
in the device 1 at the first T11J, the plug 10 in FIG. 2 is connected to the changeover switch H
because the plug 10 in FIG. In this case. Since the switch 12 is in the open state, the audio signal
a applied to the audio signal input terminal 2, a-stage amplifier 3. The filter circuit 6 is
reproduced by the speaker 5 after passing through the 61-stage gain-increase 4 ░ switch 11.
Now, when the audio signal applied to the input terminal 2 has the frequency characteristic
shown by f of 6w, the low frequency sound is not dulled due to the storage space of the speaker
6 and the speaker 5 and is also high. Since the range sound is attenuated and not reproduced by
the filter 6, the frequency band reproduced by the speaker 5 is as shown by fl in FIG. In
particular, the frequency characteristic indicated by / IVc becomes a balanced audio signal
because both high and low ranges are removed. next. When an external speaker 9 shown by *
2WJ is used as a substitute for the speaker 50 of FIG. 1, the plug 10 (6) is inserted into the jack 7
and thus the reproduction amplification path is made via the changeover switch U! ! The
connected speakers can be external speakers 9. In this case, since the switch 12 is controlled to
be closed, the filter circuit 6 does not substantially operate. 0 Especially when using the external
speaker 9, the configuration such as the speaker, etc. No. 6 is not attenuated by the high range,
so the frequency # 1 of the audio signal applied to the audio signal input terminal 2! The audio
signal having characteristics is reproduced faithfully by the tSh external speaker 9. Even if the
above-mentioned audio is added to the negative feedback circuit ports of the front stage or rear
stage amplifiers 8 and 4 as shown in FIG. On the other hand, in the conventional apparatus, since
the filter path 6 or the filter path 6 is not provided, when the audio signal is reproduced by one
device 1 and one device 5, only the bass region is removed from the frequency band of the audio
signal. The frequency band of the audio signal is as shown in FIG. In particular, since the signal is
largely biased to the high frequency range of this pole day-to-day, the sound quality is poor. As
described above, according to the present invention, when speakers having different
reproduction frequency bands are selectively used, variable control is automatically performed to
adapt to speakers using the frequency band of the audio signal passing through the reproduction
amplification thread path. Therefore, it is always possible to play a balanced audio signal in the
high and low angular range.
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