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JPS51141501

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DESCRIPTION JPS51141501
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an electric circuit diagram of one embodiment
of the stereo effect display device of the present invention, and FIGS. 2 and 3 are electric
waveform diagrams for explaining the operation of the device. is there. DESCRIPTION OF
SYMBOLS 1 ... stereo signal regenerator, 2 ... audio | voice signal output terminal for left side, 3 ...
audio | voice signal output terminal for right side, 18 ... bridge rectifier circuit, 23 ... meter. Fig. 1
■ ■-51-141 sox (2) Fig. 2 (G) ※ * g 公 R, β j j time → 3 → ヴ (b) \ 0 \ 〆 Q4! Time -2-
DETAILED DESCRIPTION OF THE INVENTION In the stereophonic audio apparatus for
reproducing and receiving stereophonic records or stereophonic broadcasts, the present
invention provides the relative difference between the two audio signals for the left and right, ie,
the stereo effect signal component. The present invention relates to a stereo effect display device
configured to be able to capture a three-dimensional acoustic sense also from the visual surface
by displaying on a meter. There are various types of stereo effects shown in Table 1 (1) shown in
Table 1 (1). However, in general, each level of two types of audio signals for the left side and for
the right side It is only displayed on the VU meter. In this case, it is possible to visually grasp the
difference between the left and right volume from the difference between the indicated values of
the two meters, but the stereo effect is not only due to the difference between the left and right
volume but also by the phase difference between the left and right audio signals. It depends
greatly. For this reason, there is a problem that it is difficult to achieve the desired purpose
satisfactorily even if the volume on the left and right sides and the relative difference between
them can be simply grasped. In addition, in this case, not only two VU meters are required, but
there is also an inconvenience that they must be arranged close to each other. The present
invention has been made in view of the above-mentioned points, and the present invention will
now be described with reference to the embodiments shown in the drawings. As shown in FIG. 1,
a stereo signal regenerator (1) comprising a record player or a radio receiver capable of
reproducing stereo audio signals is provided with audio signal output terminals +21, +31 for left
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and right sides. . And (2) one output terminal (2) is connected to a speaker (7) for left-side
installation via a preamplifier (4), a control amplifier (5) and an output amplifier (6), The output
terminal (3) is connected to a speaker 0 to be installed on the right side via a preamplifier (8), a
control amplifier (9) and an output amplifier a. Such a configuration is the same as that of a
normal stereophonic audio device 1, but in the device of this invention, the audio signal for the
left side taken out from one preamplifier (4) through the resistor @ and the capacitor αJ is the
transistor α4. Is added to the base of In addition, the right audio signal extracted from the other
preamplifier (8) through the resistor a9 and the capacitor tap is added to the base of the
transistor η, and two audio signals extracted from the collectors of the transistor +141 and aη.
Are differentially added to the input terminals α9) of the bridge rectifier circuit 181, (a), through
the respective capacitor ports), and.
Then, the two-wave rectified output of the rectifier circuit tap is supplied to the rectifier circuit (a
meter of a galvanometer connected between the rectified output terminals of 181). Here, it is
assumed that the transistors α and α have almost the same amplification 6 rate characteristics,
and (good) indicates a-(3) j gate 6 capacitor for bypass. Now, as shown in FIG. 2 (al, as shown in
al, the audio signal for the left side (the audio signal for the right side and the audio signal for the
right side (6) has the same signal waveform and has a phase difference of 90 If it is assumed that
the meter has a double wave rectified output corresponding to the difference between the two
signals, that is, an alternating waveform signal as shown in FIG. 2 (b), the pointer of the meter (2)
is , Alternating left and right-will shake. The shake is larger as the phase difference is larger, and
becomes maximum at 180. Also, in the case of the same waveform and in phase, it becomes zero.
Further, even if the two types of audio signals (rotation) and (8) are in phase, if there is a level
difference as shown in (a) of FIG. 3 between these two signals, then The two-wave rectified
output as shown in b) will be added to the meter, and in this case the pointer of the meter will
alternately swing to the left and right. As apparent from the above description, according to the
stereo effect display device of the present invention, two types of audio signals for the left side
and the right side extracted from the stereo signal regenerator are differentially applied to the
bridge rectification circuit. (4), stripe C '1, by applying the both-wave rectified output of this
rectifier circuit to the meter, the overall magnitude of the phase difference and level difference
existing between the two audio signals That is, all of the signal components that contribute to the
stereo effect number are displayed on a single meter, and it is possible to visually grasp the
acoustic stereo effect very faithfully.
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