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@ M $ 50 * 1 □ 14 □ Secretary General of Patent Office Hideo Saito 3, Patent Applicant 4,
Agent 〒 104 ■ Japan Patent Office 0 JPA 51-815400 Published Japanese Patent 51.
(1976)7. J6 · ■ Japanese Patent Application No. 50-5? / 3 Office serial number
specification 1, the name of the invention
Phase shift circuit
3. Detailed Description of the Invention In the present invention, in order to improve the width of
the stereo, the signals of the left and right channel systems are branched, and the low and high
frequency levels are lowered through band-pass filters, and the phase is It is an object of the
present invention to provide a phase shift circuit which is applied 180 ° to each other channel
system. Hereinafter, an embodiment of the present invention will be described with reference to
the drawings. In FIG. 1, vl is an input terminal of an audio amplifier 2 whose output side is
connected to a speaker 1 and a force 1; The other end of the coupling capacitor c3 branched
from the terminal Vi and connected via the resistor R3 is connected to the base of the transistor
3 whose emitter is grounded. C1 is a capacitor for reducing the level of the high frequency
connected in parallel with the resistor R1 between the base and the collector of the transistor 3,
and C2 is a low frequency connected in parallel with the resistor R2 between the emitter and the
ground These capacitors C1 and C2 constitute a band pass filter (band pass filter). By connecting
such a band pass filter, an output terminal v0 connected to the collector of the transistor 3 via
the coupling capacitor C4 when a constant level input signal is applied to the input terminal v1
over the entire frequency is obtained. As shown in FIG. 2, a signal having frequency
characteristics in which the low and high frequency levels are lowered is obtained. The signal
obtained at the output terminal v0 is changed in phase by 180 degrees with respect to the input
1 / ++, an input added to the input Vi by passing the transistor (2) EndPage: 13. The 180 °
phase-changed signal -r'11 <is applied to the human power terminal V4 of the right channel
amplifier 2 'through the resistor R4. On the other hand, a part of the input signal of the right
channel amplifier 2 'is also added to the left channel amplifier [input of 11 unit 2] "iW child Vi"
through the same phase shift circuit as shown by the dotted line. . Such a phase shift circuit is
used to increase the effect of expanding the stereo, but in this case, the frequency that actually
has the directivity in the aural sense does not require low and high frequencies, and 3ooH2 to 2
The phase shift circuit according to the present invention is 300H2 to 300H2t by providing a
band-pass filter as described above because it is about 3000H2. It is possible to have a frequency
characteristic of 60 degrees, and it is unnecessary at low and high frequencies compared to the
71 polyphase circuit in which the phase of the frequency of all bands is inverted and added to
other channel systems as in the past. Interference and reduce the possibility of poor sound
In addition, this output terminal ■. By connecting the indication meter 5 such as a VU meter or
level meter via the rectification circuit 4 consisting of the rectification diode D and D2, the
magnitude of the indication of the indication meter 5 matches the magnitude of the voice on the
sense of hearing Or you can get close. The reason is the output terminal V. In the frequency
characteristic obtained in the above, by passing the band-pass filter, as shown in FIG. 2, the levels
of low and high frequencies are reduced. On the other hand, even if the physical sound pressure
is the same, the low and high frequency sounds are perceived as small (weakly) in the auditory
sense, as in the case of the isometric melody of the sound shown in FIG. Therefore, by lowering
the low and high frequency levels of the audio signal through a band-pass filter and causing the
indication meter to indicate, the indication of the indication meter agrees with or approaches the
magnitude of the actual audible speech. As a result, when adjusting the volume or adjusting the
stereo balance, if the adjustment is performed while looking at the U meter or the level meter, the
state of hearing can be satisfied.
4. Brief description of the drawings. FIG. 1 is a circuit diagram showing an embodiment of the
present invention, and FIG. 2 is a diagram showing an input signal of constant level over all
frequencies applied to the input terminal of this circuit. FIG. 3 is an iso-sensitivity curve of sound
intensity. DESCRIPTION OF SYMBOLS 1 ... Speaker 2, 2 '2 ... Sound amplifier, 3 ... Transistor, 4 ...
Rectification circuit, 5 ... Indication meter, C1, C2 ... Capacitor which comprises a band-pass filter ,
C3, 04 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · resistor connected in parallel with the
capacitor C, C2, Dl, D2 ... rectification diode constituting the rectification circuit, vl, vl · · · ·・ ・ ・
Input terminal, vo ... Output terminal. Ward EndPage: 26, Agent address other than the above
Address 8-12 12-15 Ginza, Chuo-ku, Tokyo 236-EndPage: 3
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