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Description 1 each, the name of the invention
Sound reproduction device 2-% J + fia * (7) range и 4 impedance conversion circuit inside, ? a
sound reproduction device with muting records that have been destroyed.
6. Detailed Description of the Invention The present invention relates to a sound reproducing
apparatus, and more particularly, when a motor of a record player having an impedance
conversion unit is driven, and also due to a change in load at the start of motor driving. It relates
to a motor drive 4 ? or one configured to detect a variation in voltage and to shift muting k + jf.
In recent years, with the remarkable passage of audio equipment, it has become possible to listen
to Hf-like sound with a characteristic, and at the same time the whistle of the listener has also
become omnidirectional in demand for hi-fi sound. In fact, in the case of preparing an excellent
amp and record player of vcvfH King in fact. Also, it has been clarified that the quality of the coat
connecting these greatly affects the quality of the above-mentioned sound quality. In a playback
device called %% stem coaxial, a record player is connected to a phono terminal of an amplifier
by passing a phono cord of 1 to 1.5 m, and the cartridge output is supplied by an amplifier VC.
The phono cord has a constant electrostatic valley east, and when this electrostatic 8 amount is
thick, the reproduction characteristic of the high frequency band is deteriorated and the clear
sound reproduction becomes dull. In contrast to VC, a phono code intended to lower the
capacitance has been developed, or most of them are at most 65 PFJJ-, and it is difficult to
further improve it. Even with the advent of an integrated playback device called modular-stereo,
which has a unique function of 1 / code player and amplifier and uses a power source as a slave
unit VC, the long phono code as described above is omitted, and the high frequency
characteristics are eliminated. There is also an improved version of However, convenient to carry
and handle 1 Selective connection of the equipment becomes customary EndPage: 1 Sound 7?
Between the many, it is still performed to connect the record player and the amplifier using the
phono code. Therefore, there is a situation where the sound quality improvement over the above
conventional can not be expected. Therefore, when connecting a record player and an amplifier
by using such a phono code, an audio reproduction apparatus is provided which incorporates a
record player jTiil I 'and an impedance conversion circuit so as to send out cartridge output to an
external amplifier with low innocance. The inventor has proposed. As shown in Figure 1 and t'Ltd
M17, the resistance R and inductance LVC of the cartridge l) and the impedance conversion
circuit W-i provided in the FN iJ vcvc-y-d player, for example connecting a transformer or emitter
follower circuit sheep 1 Through this impedance conversion times 9V.
It is configured to be connected to an external preamplifier A with an I's'IC phonoko chord tone '.
Therefore, in such a case, the IC has such a characteristic that the output drops at a frequency
higher than the point where the input impedance becomes smaller and% fo = R + RL / 2?L, and
the temperature range in the audio frequency band is extended by allowing a temperature range
to be audible around io. Is improved. This f ? ? L is shown in FIG. By the way, according to the
sound reproducing apparatus with improved high frequency characteristics, a direct source
circuit including a head amplifier as a impedance conversion circuit and a transformer for an
equalizer amplifier is incorporated into the above-mentioned record player, and the four source
circuit is When the amplifier is powered by @vc, the following problems occur. That is, when the
record cleaner is cleaned by the record cleaner while the turntable is rotating, this is added to the
motor as a large load, and a large fluctuating current flows in the motor, resulting in a significant
decrease in the power supply voltage. Therefore, a large current flows on the secondary side of
the power supply transformer, which induces fluctuations in the power supply voltage of the
head amplifier and preamplifier, causing noise in the reproduced signal, which can be heard as
noise. In particular, in a record player using a direct drive type motor, when the output current of
the power supply is started (compared to when it flows approximately 10 times compared to
when it is energized? ????? It falls 6.0% VC. Furthermore, considering that the motor and
the amplifier are incorporated together into one female body such as a player having a specific
shape as described above, the disturbance due to the signal-flow entrainment due to the change
of the magnetic flux becomes remarkable. However, if the transformer for the head amplifier and
the equalizer is separately provided from the transformer for the external amplifier, the problems
as described above can be solved at one time, but there is a disadvantage in cost. SUMMARY OF
THE INVENTION In view of such conventional problems, the present invention proposes an audio
reproduction apparatus that detects a predetermined level on a record play incorporating an
impedance conversion circuit, and mutes an audio reproduction output. At the time of start-up,
when cleaning with a cleaner, when hand t-1q'2 on the turntable, muting the noise generated at
the time of motor load fluctuation etc. which occur at the time of speed switching, etc. Provide a
new technique 'fQ' f with consideration for In the following, 1c, one embodiment of the present
invention will be described with reference to the drawings. FIG. 6 is a specific circuit diagram of
the present invention. Reference numeral 1 denotes a power supply transformer accommodated
in the record player, and the primary winding -VC is connected to the insertion plug 3 via the
power supply switch 2.
The secondary winding vc of the transformer 1 is connected to the full wave rectifier diode 4 and
the rectified output vc is connected to the motor 6 for driving the turntable via the servo circuit
5. Further, the zener diode 7 and the resistor 8 are connected in series in parallel with the motor
circuit, and the resistor 8 vc and the resistor 9 and the capacitor 101 and further the resistor 11
are connected as illustrated. There is. ??? Between the resistor 11 or the capacitor o and the
resistor 9 and the resistor 1c, the base side of the transistor 2 is connected rL, connected to the
rectified output power supply side via the collector side relay coil 16 of this transistor EndPage:
21 ░ / emitter, emitter It is grounded to the side. Further, the relay switch 16 which is
controlled to open and close as described above is attached, and the reproduction output 16
from the pickup cartridge is supplied to the external amplifier through the relay switch 16 so
that the sound is heard from a predetermined speaker. There is. Next, the operation of the above
circuit will be described. First, when the motor 6 is steady rotating to drive a constant load (turn
table etc.) VC does not cause a significant change in the rectified output, so that the gate current
voltage is predetermined via the zener diode 7 The voltage of the resistor 8 vc is added to the
capacitor 1 o 6 via the resistor 9. At this time, a predetermined base voltage is applied to the
transistor 12, which is turned on to energize the relay coil 13 to close the relay switch 16
described above. Thus, at the time of steady operation of the motor 6, the stabilized power
supply is converted to the audio output 1 ? of the equalizer circuit 15 which is operated by
receiving the supply of the power supply of Japanese Patent Application Laid-Open No. 5323604 through the external amplifier of the zeroed player. Sound is emitted by the speaker. On
the other hand, when it is intended to clean the record board on the turntable with the dust
cleaner at the time of constant rotation of the motor 6, VC is affected by the load applied to the
motor 6 by the cleaning operation. As shown in the figure, when the rectified voltage V drops
sharply and drops below the Zener voltage of the Zener diode 7, the charge stored in the
capacitor 10 vc through the resistor 11 performs discharge with a predetermined time constant
(?1- ? C ?) Then, the relay coil 16 is de-energized and the relay switch 16 is opened.
Therefore, the output of the equalizer circuit 15 is cut off. On the other hand, when cleaning of
the record board is completed, the load of the motor 6 becomes 47, and the rectified voltage
rises, and when it exceeds the Zener voltage, the capacitor 10 has a predetermined time constant
(?9 = '% ?1) VC Be charged.
Thereafter, the transistor 12 is turned on to energize the relay coil 16 to close the relay switch,
so that the output of the equalizer circuit 15 is supplied with the external amplifier VC.
Therefore, if the rectified voltage 1f falls, that is, if the motor load VC changes, if vc, the equalizer
output is supplied to the speaker via the head amplifier and the like as IA mlv? ??? Therefore,
it is possible to mute noise that occurs when the load changes (if it changes). 10J-like V When
the motor 6 starts up, the load on the motor is extremely large, and the start-up current is
flowing. The renal flow pressure drops by a large 1.1 / c. ?????? If the rectified voltage is
lower than the zener voltage Vz, the charge of the capacitor 10 is discharged through the resistor
R1 as described above, the transistor 12 is turned off to open the relay switch 16, gradually
changing the rectified output up. Cut off the noise due to When the rectified output reaches the
Zener voltage VZvc, the capacitor 10 is charged through the resistor 9, and the transistor 12 'is
turned on to close the relay switch 16 so that the equalizer circuit is an external amplifier.
Connected with In this case, the setting of the time constant and the zener voltage of the upper
eye pitting V can be selected from the specific characteristics that do not generate noise due to
the sufficient rotation of the motor. As described above, according to the present invention, due
to the fact that the record playering incorporating the impedance conversion circuit is fc, the
load voltage vC current dL fluctuates to the dog-at the time of start-up or cleaning of the record
board. Or, if the magnetic flux from the seven-winding coil causes noise in the lower amplifier or
equalizer circuit incorporated in the record player vc1 cuts off the noise in the audio output
caused by these causes, and an offensive speaker is emitted Be prepared to listen to In particular,
the present invention is useful in the case where an impedance conversion circuit including
EndPage: 3 such as an equalizer amplifier is interposed in a record player in order to improve
high frequency characteristics.
4. Brief description of the drawings FIGS. 1 and 2 are equivalent block circuit diagrams ? and
frequency characteristics of the sound reproduction circuit in which the impedance conversion
circuit which is the basis of the present invention is accommodated inside the record player. FIG.
4 is a schematic diagram showing an embodiment of the present invention, and FIG. 4 is a
diagram of the circuit of the present invention. 1 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и z Attorney Doe Co., Ltd.
1 Q 10 small pond ? 1 ? 21 fO-+ f (H 2) 13 End Page: 4 procedure amendment (sponsor)
October 4, 1977, Secretary General of Patent Office Katayama Ishibe, 1, 1 Patent application No.
097789 2 Title of the invention 2 Name of the invention Relationship with the case of correction
of sound reproduction device 3 Patent applicant address Tokyo part for Tokyo North article 6chome 7-35 name (218) Sony Corporation representative Person Kazuo Iwama 4 amount agent
5, date of correction instruction Spontaneous 6, object of correction (7-1) In the specification,
page 3 line 18 to line 19 line mention ?Input impedance is ... The following points are corrected
in the following manner. "The output impedance is smaller, fo =-'-(where C is Fonoko-2?CR). The
quantity 8 Ro of the diode is the output impedance of the impedance conversion circuit. 1) and 2
are corrected as shown in FIGS. 1 and 2 of the attached drawings. ???????? ?
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description, jps5323604
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