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3. Ministry of Invention Address 5, Agent-1 Place 125 in Yozaki-shi, Kanagawa Prefecture
Minato-cho 125 @ Location Name Japan Columbia Co., Ltd. Kawasaki Co., Ltd. Kawasaki Co., Ltd.
(6738) Patent Attorney Kazumi Yamaguchi 6, Eyes of Attached Documents (1) One statement (2)
One drawing (3) One proxy (4) Application form duplicate-1 ■ Japan Patent Office @ JP 4827701 ° [phase] Published Japanese Sho 48. (1973)4. Japanese Patent Application
Shoin et al. (Jan. 1997 // No request for examination (2 pages in total) Description Title of the
Invention Mixing circuit First means for attenuating or removing audio signal frequency
components which are offset in the input signal, and second input signal component A mixing
circuit characterized in that it is mixed within an attenuated or eliminated band in the audio
signal frequency component.
DETAILED DESCRIPTION OF THE INVENTION The present invention is included in the input
signal of tJLl when mixing with one pass KIL, the first high power signal from a tail recorder or
record player, etc. and the second input signal from a microphone. The voice frequency band is
substantially attenuated or cut so that the second high power signal component is completely
mixed in the voice frequency band. For example, the means for recording through a plurality of rwavers having different high-power-tube center frequencies from a plurality of microphones is
disclosed in, for example, # 'i patent application publication No. 10388 gazette. There is no
known means for attenuating or cutting a particular frequency band of the input to mix the
second input signal into the attenuated or cut portion. According to the present invention, of the
accompaniment music and the singing voice of singers recorded on a generally commercially
available record disc or tape, only the singing voice is attenuated or cut, and a song which oneself
sings from the microphone is inserted in that part. An embodiment of the present invention
which is useful for practicing songs since it can be done will be described in detail with reference
to FIGS. 1 to 4. In FIG. 1, (1) is a tail recorder or record player where the output signal
component from the tape or uV code is appropriately amplified, and under normal conditions the
first yarn path (2) has power amplification It is emitted from the speaker (4) through the device
<8). A normally closed contact (+5) is inserted in the first yarn path (2). Next, when an audio
signal comes in from the microphone (6), the cough audio signal component is amplified by the
amplifier (7) and the component is amplified through the mixing resistor (8) of the thread line
(9). Supply to the vessel (8). Add a part of the output signal of the amplifier (7) to the drive
circuit EndPage: 1. The drive component of the cough drive circuit company is charged with the
signal component of the amplifier, the detected DC component, and the normally open contact
(8) is turned off. In this way, the signal component from the tape recorder or record player (1)
passes through the band elimination filter IIJ # and is removed in a frequency range determined
by the frequency that limits the band of the band elimination filter, and the microphone (6 The
output mixed with the audio signal component from V.2) is obtained from the speaker (4) as
shown in FIG. The horizontal axis is frequency, the vertical axis taV power, and the curve os is a
band removing v wave device-frequency characteristic, and (b) is a frequency characteristic curve
of the sound signal from the microphone. Although the limit frequency of the above-mentioned
band elimination filter (mostly) is selected within the range of the audio signal, the lower limit
frequency is about 1 as a result of various experiments.
The upper limit cycle i number depends on the condition to remove the bell ringing signal to cut,
but good results are obtained with 5 ooo Hts degree when only the male voice is to be cut. The
second embodiment will be described in detail with reference to FIG. The same parts as in FIG. 1
are assigned the same reference numerals and duplicate explanations are omitted, but in this
case a low pass 111F wave (i2m) is inserted in the main line instead of the band elimination V
wave (2) In this case, the low pass llFm current consists of two resistors (R1) (R2) and a capacitor
(C1), and two resistors (R1) (R1!). ) Between the serially connected connection point and ground,
and the capacitor (C1) and the aforementioned relay contact (ISa)? To interpose. In this case, the
contact is a normally open contact. Thus, the output signal from the tape recorder or record
player (1) is supplied to the power amplifier to such an extent that the signal (RIXR2) attenuates
the signal somewhat and becomes a good signal. Next, when the voice is stored in the
microphone, the low-pass V-wave (1 ha) tube is formed by turning on the regular l @ contact (5
畠) connected in series with the capacitor (C1). Among the signal components from the tape
recorder or the record player (1), only the low-pass component (13m) of the fourth illustration
shown in the figure is cut out. At this time, the signal component (14m) from the microphone (6)
is indexed. In the case of a whistle, the frequency band as the male and the female sing is mixed
completely, and the song which oneself sings from the microphone (6) is mixed. The present
invention is characterized in that the signal component to be damped or cut can be superimposed
only on the band of the squeeze component by the extremely simple configuration as described
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 3 are a system diagram showing an
embodiment of the present invention, and FIGS. 2 and 4 are frequency characteristic curve
diagrams of FIGS. 1 and 3. FIG. (1) is a record player or tape recorder, (8) is a 10,000 amplifier,
(4) is a speaker, (5) (lia) is a relay contact, (6) is one electronic phone, (7) is an amplifier , (8):
mixing resistor, ■: drive circuit, aDFi solenoid, (2): band elimination filter + (t2a) rt low pass m
filter. a sieve (13a) o 4 (14 m) is a curve showing the band characteristics of each frequency.
Patent Assignee Hiroshi Yonezu Agent Kazutoshi Yamaguchi (5) EndPage: 2
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