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DESCRIPTION JPS5741388

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DESCRIPTION JPS5741388
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an arrangement for
electrically synthesizing low-pass signals of both left and right channels according to an
embodiment of the present invention; FIG. 2 FIG. 6 shows another embodiment of the present
invention, and is a cross-sectional view showing a configuration in the case of acoustically
synthesizing low-pass signals. 10 ...... stereo micro cassette Detsuki unit; EIO ? ...... L-channel
reproduced signal; E10 ? ...... R-channel reproduced signal; 121,12 ░ ...... Volume control
volume; 14 ?, 14 ░ иииииииииии Power amplifier; 16 ? ииииииииииииииии Speaker: 20 иии Field-pass filter; Sound
path; 108 иииииииии Sound absorbing material.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sound
reproduction apparatus having improved low-frequency reproduction characteristics in a
boutuple stereo reproduction apparatus or the like using a small speaker. In a small-sized bautuple stereo device using a micro-cassette or the like, the size of the i-position is limited, so a
large-sized speaker can not be adopted. From this, it is difficult to reproduce the low range with a
sufficient level in such a small stereo device. It is also conceivable to perform a pass boost on the
side of the aeration circuit in order to increase the low-pass volume feeling, but this method
requires a large power for the power amplifier. Moreover, with a small speaker, no matter how
much bass boost is done, only the low-range distortion sound is increased, and the low-range
characteristics are not improved so much. This device is considered to be an article, and it is an
object of the present invention to provide a serial number reproducing device capable of
improving low frequency reproduction characteristics even with a small speaker. FIG. 1 shows an
electric circuit of the sound reproducing apparatus according to the present invention. From the
stereomicrocassette deck unit 10, an L channel reproduction signal Fi1a. And R channel
reproduction signal Ezo is output. In FIG. 111, since the L channel and the R channel have the
same configuration, the common parts have the same reference numerals appended with
subscripts 11 "and 12" to simplify the description. 1g No. E1 (1, a juice flail adjustment volume
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121 and a resistor Rho) via a power amplifier 14. It is given to the positive phase input end of. ?
????? The output end of is connected to its negative phase input end via a resistor R12. The
negative phase input terminal has a resistance RJ4. It is grounded through The output terminal
of the amplifier 14 ░ is L channel speech 16. And is grounded via the resistance / correction
ratio R16. The connection point between the speaker 6 ░ and the resistor R161 is connected to
the negative input terminal of the amplifier 141 via the resistor Rigi. ?????? The positive
phase input end of the power amplifier 14 is connected to the positive phase input end of the
power amplifier 14 via the resistors R201 and R20. The connection point of the resistors R20
and Rsto is grounded via the capacitor C20. ???????????????? ?????
??????? The low-pass filter 20 adds and synthesizes only low-pass signal components of
the signals E12H and E12 * input to the. The filter 200 frequency characteristics include the
speakers 16 and 16. It is determined experimentally so that the low-range reproduction sound
pressure is effectively increased to the extent that the stereo feeling of the reproduction sound
generated by is not impaired.
??????????? When a speaker having a diameter of about 3 to 4 inches is used, the
13 dB cutoff frequency of the filter 20 is selected to be, for example, about 100 to 200 Hz.
Although the filter 20 of FIG. 1 is of the type of 6 dB 10 ct, it may be a low pass filter 20 having a
slow slow-j of -126 B /! Ct or more, which constitutes an appropriate .pi.-type CR filter or the like.
In the configuration of FIG. 1 (in accordance with the second embodiment, the speakers 6,. Are
driven in phase. This is equivalent to the fact that the substantial low frequency radiation area of
the speaker is doubled, so that the energy in the low frequency region is doubled and the sense
of volume is enhanced. On the other hand, with the predetermined frequency training, the
amount of signal synthesis in the left channel is small, so the sense of stereo is not lost. @ 1 Fig. 1
= In addition, resistance RJ6. Current negative feedback is applied using RIB and RJ4. Since this
magnetic current negative feedback increases the output impedance of the power amplifier 14, it
is effective to increase the sound pressure at the lowest resonance frequency 1 ░ of the speaker
16. This is because the impedance of the loudspeaker type f becomes extremely large at f, and
therefore, if the output impedance of the ammono 4 is affected, the voltage applied to the
loudspeaker at fo will be high. FIG. 2 shows another embodiment 4yjl of this invention. Speaker
16. . 16t are attached to the left and right sides of one% l 'rl cabinet 100. The speaker 16, back
capacitance 102 is connected to the back cavity 106 of the speaker 6 via the sound path 104. In
the sound path 104, a sound absorbing material 108 is inserted as needed. The sound path 104
and the suction material 10B correspond to the low pass filter 20 of FIG. Now, it is assumed that
the low preference No. 41 is input to the speaker 61 and no bass note is input to the speaker 6.
In this case, the back sound pressure of the speaker 6 is transmitted to the back of the cone
paper of the speaker 6 through the sound path 104. Then, the speaker 6t works as a so-called
passive radiator (drone cone). That is, in a specific low frequency region, the cone paper of the
speaker 6 is driven by the back surface sound pressure of the speaker 61 and resonates. ???
???????? The low frequency sound pressure in phase with the front surface of the
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speaker 6 is emitted from ?J [I [I.
In this case, as shown in FIG. If the output impedance of the speaker 6t is increased, the speaker
6t receives almost no magnetism. For this reason, the cone paper of the speaker 6 is easily
vibrated (resonated) by the back surface sound pressure of the speaker 6. However, since the
medium to high frequency sound pressure emitted from the speaker 6 ░ is sufficiently = tttt by
the low pass filter including the sound path 104 and the sound absorbing material Jos, the
speaker 6! It can hardly be transmitted to the side. For this reason, there is no concern that
stereo confusion will be degraded. As described above, according to the present invention, since
the emission area of the speaker in the low band can be doubled, the low band reproduction
characteristic can be improved. The embodiment described in this specification and illustrated in
the drawings does not limit this 4 m.
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