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JPS4876405

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DESCRIPTION JPS4876405
Patent Director, General Secretary Ito Takehisa 1; title of invention 4; agent [Japanese] 1
Japanese Patent Office 1 published patent 1 Japanese patent JP 48-76405 [phase] published
Japanese JP 48. (1973) 10.15 examination request (all 3 pages) Description 1, title of the
invention 1, title of the invention FM reproduction device
Address 72, Horiyoshicho, Yoshizaki, Kanagawa Name (307) Tokyo Shibaura Electric Co., Ltd.
Representative Toshimitsu Doumitsu
8. Detailed Description of the Invention The present invention # iFM playback equipment fjlKwA.
The left channel signal and the right channel signal, which are stereo signals, include not only
direct sounds from various instruments arranged with a wide band, but also various indirect
sounds due to reflection on a wall or the like. Direct sound converts this into left and right
channel signals! A difference occurs in the level and phase depending on the positional
relationship between the microphone and the instrument, and the difference gives a sense of
location to the sound of the instrument during reproduction. Also, the microphone four phones #
'! The indirect sound emitted in various directions from other instruments such as the above
direct sound and reflected by an object such as a wall is also collected, but in order to take these
indirect sound complex routes, both the level and the phase are completely different Because of
this difference, Kfr Hiro is given a pleasant feeling and an m'1lII feeling during reproduction.
Therefore, the difference between the left and right channels 'spread signals and a sense of
presence are given to the reproduced sound, and the difference between the left and right
channels' signals is branched and the stereo signal is usually used. When reproduced with a
reproduction system separate from the reproduction system, an approximate '&' channel effect is
obtained. The present invention is regarded as the above-mentioned point, and it is considered
that a pseudo 4-channel effect can be obtained in a device where a stereo adapter is connected to
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an ordinary FM receiver to reproduce FM broadcast in stereo. It is an object of the present
invention to provide an FM reproducing apparatus. EndPage: Below, one embodiment of the
present invention will be described with reference to the drawings. The FM broadcast received by
the FM reception @ 11 q antenna 12 is selected by the tuner 13 and converted to an
intermediate frequency, and this signal is amplified by the intermediate frequency amplifier 14
and then demodulated by the demodulation circuit 15 to obtain this demodulated signal The
switch circuit 16vI is configured to be supplied to and amplified by the low frequency amplifier
17 via the switch circuit 16vI, and then reproduced by the speaker 1B. The stereo adapter 19
includes a stereo signal demodulation circuit 20. The right channel signal output terminal of the
demodulation circuit 20 is connected to the input terminal of the low frequency amplifier 210,
and the output of the amplifier 21 is output. The end is connected to the speaker 22vc. That is,
the right channel signal derived from the stereo signal 'demodulation circuit 20 is amplified by
the amplifier 21 and reproduced by the speaker 22. When the stereo adapter 19 is connected to
the FM receiver 11 by the hood 23, the switch circuit 16 is opened and the output terminal of
the demodulator circuit 15 is connected to the stereo signal demodulator circuit 200 Å. The left
channel signal output end of @ 20 is connected to the low frequency amplifier 170 input end.
That is, the signal demodulated by the demodulation circuit 15 is supplied to the stereo signal
demodulation circuit 20 to be separated into the right channel signal and the left channel signal,
and the right channel signal is reproduced by the stereo adapter 19 as described above. Since the
left channel signal is supplied to the low frequency amplifier 17F and reproduced by the FM
receiver 1111, the FM receiver is also reproduced in stereo. Also, the stereo adapter 19 is
provided with the input terminal 24 for the left channel signal. The terminal 24 is connected to
the recording terminal 26 of the FM receiver 11 by a cord 25. In the case of a square, the first
external speaker 28 is connected between the positive electrode terminal 271 and the negative
electrode terminal 272 of the speaker terminal connected to the positive electrode terminal 271
of the first external speaker terminal of the input terminal 24. Be done. Also, the output end of
the low frequency amplifier 21 is the positive terminal 2 of the second external speaker terminal.
The second external speaker SO is connected between the second external 4 ° “w− * m +
o′′E ′ ′ xti, kj [i e 292]. The first and second negative speaker terminals 272 and 282 d of
the first and second external speaker terminals are connected in common and grounded via the
variable resistor 31. That is, the left channel signal is applied to the positive terminal 271 of the
first external speaker terminal, and the right channel signal is applied to the positive terminal
28'1 of the second external speaker terminal. And the right channel signal difference signal is
reproduced by the first and second speakers 28 and 50. Therefore, by arranging the first and
second speakers 28.degree. 3o to the rear right and left, a pseudo 4 channel effect can be
obtained. Therefore, according to such equipment [according to the 7M stereo broadcasting can
be listened to in a pseudo 4 channel manner, the acoustic effect is improved.
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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an embodiment of a
7M playback apparatus according to the present invention. 11 FM receiver, 19 stereo adapter,
28 SO speaker. Applicant Shibaura Electric Co., Ltd. Attorney Attorney Takeshi Suzue End Page:
2ψ-Y-Special Side Sha 48-76405 (3) ~ 1-5, List of Attachments-Agent EndPage: 3
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