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JPS51124401

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DESCRIPTION JPS51124401
April 1975 Construction 3rd 3. Patent applicant 4 and agent 8160 specifications ■ Japan Patent
Office ■ Japanese Patent Application Laid-open No. (1976) 10.29 Office serial number In this
type of stereo reproduction device, the name of the stereophonic reproduction device of the
invention stereo reproduction device 2 channel headphone and wavelength 3m or less provided
at a predetermined position with respect to the listener An electromagnetic wave generating
source generating an electromagnetic wave, a receiver receiving a pair of upper electromotive
eight waves whose mutual positions change corresponding to the rotational angle position
relative to the reference direction of the head of the above @ The at least one variable circuit, the
frequency characteristic variable circuit, and at least one of the circles of the variable delay
circuit and the variable delay circuit respectively provided in the plurality of signal supply paths
of 1 kM, and the -i amount variable circuit according to the reception output of the wound
machine. A stereo reproduction apparatus configured to control at least the ringing noise of a
frequency characteristic variable circuit and a variable delay circuit.
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stereo using two
channel headphones: Reproduction and snow making, particularly improving the localization of
the it image and fixing the if image foot position even if the listener's head direction is changed It
is something to be added. Since the sound is localized relative to the on-state, if the player 1a
turns his head while listening, he will move along with it. For this reason, it may still give the
listener an unnatural feeling, and there is a risk that the sense of reality will be lost in terms of
the grain. The present invention has been made to solve such a point, and a single channel stereo
reproduction apparatus according to the present invention generates two channels, an
electromagnetic wave having a wavelength of 3 cr 11 or less provided at a predetermined
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position for a listener. Corresponding to the electromagnetic wave source and (2) movement
angle position with respect to the reference direction of the head of the listener, the mutual
position 1ff-fi! A receiver having at least one of a receiver for receiving a changing pair of
electromagnetic waves, a volume I3T converter, a frequency characteristic variable circuit and a
variable delay circuit respectively provided in a plurality of signal supply paths to the head
phone; By controlling at least one of the p volume change circuit, the chest wave number
characteristic change circuit and the circle of the variable delay circuit by the reception output of
p, the sound pressure is always at the absolute position around the listener. It is localized and
gives a better sense of presence to the people. Hereinafter, an embodiment of a stereo
reproduction apparatus according to the present invention will be described with reference to
the drawings. In FIG. 1, (1) is a listener, and an infrared lamp (2) as an electromagnetic wave
source is provided in front of the listener (1). As this infrared lamp (2), for example, an
incandescent lamp Qυ is housed in a housing (221, and holes are formed only on the surface of
the housing facing the listener (1). Use a filter attached with a filter that allows light to pass
through. Also, (3) is a head phone device which is worn by the listener 11+, and this head phone
wear * (3) will be described in detail with reference to FIGS. 2 and 3. FIG. First, FIG. 2 shows a
plan view of this head type device (3), the upper blade of which is in front of the hearing aid at
the time of observation. A speaker housing L311.Hendoff device (3) incorporating left and right
speakers (30L) and (30B). ) And (31B), and a band weir connecting the speaker housings (31L)
and (31R), and further outside the speaker housings (31L) and (3li%) in the non-invention 31 Lshaped light shielding plate (33L) and L331 (,) are attached as shown in the figure, and an
electromagnetic wave in the rear projection of the light shielding plates (33LJ and (33R), ie, an
infrared receiver in this example The former detection lens as, for example, the photodiodes
(34L) and (34R) are spread.
Also, it is a front / rear angle detector that detects the inclination angle before and after the head
of the 651 / a listener. FIG. 3 is a side view of the front and rear angle detector (35), wherein
L35a) I-'r variable resistor in FIG. 3 is attached to the sliding shaft of the variable resistor (35a) at
(35b). 9 The front and back angle detector C351 is mounted on the top of the belt C3t of the
head type 3 in such a manner that the sliding axis of the variable resistor 35a is parallel to the
line connecting the left and right speakers 301 and 30B. Attach. Note that (36 L) and L 36 f (, ff)
respectively supply audio signals to the left and right ear pad pads, G は represents the speakers
L 30 L) and L 30 B), and the receiving detection power and front and rear angle of the
photodiodes 34 h and 34 B. It is a lead wire for increasing the detection output of detection
Masuda. (4) is a four-channel tape recorder, and the tape recording ′ ′ 蒐 4) scooping one +47
and four 11 raw output terminals (4F), (411), (4B) and (4B), among which the output signals of
the output terminals (4L) and (4) are respectively variable delay circuits (5L), (5) t, variable as a
sound tOT variation circuit The mixing circuits (8L) and (8R) vc are supplied via the attenuation
circuit (6L), (6) and the frequency 15 [characteristic variable circuit (7L), (full). In addition, each
output signal of the output terminals (4F) and (4B) is variable delay circuit (5F input (5B), 5T
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variable attenuation circuit (6F ′ input (6B) as volume change circuit, frequency characteristic
variable circuit M (M 7F). The first and second output terminals (9FL input L9B1) of the variable
distributors (9F) and (9B) are supplied to the variable distributors C, 9F) and (9B) as volume
variable circuits via (7B), respectively. . And (9F ratio) and (9BR) output signals are supplied to
mixing circuits (8L) and (8R), respectively. Further, the output signals of the mixing circuits (8L)
and (8 几) are supplied to the left and right speakers (30L) and (30) t of the 2-channel
headphone (3). Also, the output signal of the above-mentioned photodiode (34L), L34B) and the
front / rear angle detection can end is supplied to the control circuit u 窃, and the output of this
control circuit tlG makes the variable delay circuit (5L input (5R, 5F) , (5B), variable attenuation
circuits (6L), (6R), (6F), (6B), frequency characteristic variable circuits (7L), (714), (7F), (7B) and
variable dividers (9F) ), (9B) are controlled. In this case, the frequency characteristic variable
circuits (7L), (7R) and (7F) (7B) are circuits that change the high level of about 1 to 10 kHz
according to the control output of the control circuit 1101 p. For example, as shown in FIG.
Incidentally, only the frequency characteristic variable circuit (7L) inserted in the left audio
signal system in the fourth place is shown, but the other frequency characteristic variable circuits
(7FL input (7F) and (7B) have almost the same configuration. . In FIG. 4, both ends of the
photodiode (34L) are connected between the base of the transistor n and the ground. The
collector of this transistor συ is grounded through a resistor (c), and the emitter is connected to
an image terminal C3 of voltage -5 v. The collector of this transistor (c) is connected to the gate
of a field effect transistor (hereinafter abbreviated as FE'l ') through a resistor 174. The source of
this FL1liT 95 is connected to ground, a capacitor ql19 is connected between the gate and the
source, a resistor 0 is connected between Endless i between the drains and a drain is connected
to the signal line-through the capacitor (c). Note that, in the circuit of FIG. 4, when the source
irradiated to the photodiode (34L) becomes dark, the impedance of the photodiode (34L)
increases and the potential of the collector of the transistor (2) rises, The FET 9 is turned on to
reduce the high frequency component of the audio signal flowing through the signal line g. 'Also,
the variable attenuating circuit (6L) is a circuit that changes the ratio of the levels of the two
output signals according to the variable distributors (9F) and (9B) and the control output of the
control circuit t101. Although (6R), (6F), and (6B) may not necessarily be provided, in the present
embodiment, these two also jointly cooperate to distribute the two output signals of the variable
distributors (9F) and (9B). The level ratio is changed with a predetermined characteristic. Human
perception of sound source localization is the sound pressure level difference, phase difference,
and timbre of sounds (sound waves) heard by both ears. 8 due to the above-mentioned luck of
the high-pitch range of 1 to 10 kHz) and their changes by turning the head left and right, but the
variable characteristics of each of the above variable circuits It sets up by experiment etc. in
consideration. In addition, as shown in FIG. 5, the left and right microphones (1111) and (IIR)
provided at the positions of the eardrums of the left and right ears of the pseudo head a, as a
tape recorder (recording tape reproduced by 41) The forward and backward directional
microphones (1tF) Et-He (11B) facing the front and the rear of the pseudo head a are used, that
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is, four channel recordings of outputs of a total of four microphones. 7 ′ ′, the recording signal
of the microphone (IIL) is output to the output terminal (4L), the recording signal of the
microphone (11) L is output to the power terminal (4R), and the recording signal of the
microphone (1114 ′) is output At (4F), the recording signal of the microphone (IIB) is output as
a reproduction signal to the output terminal (4B).
In this stereo reproduction apparatus, first, when the N4 holder H1 faces the front, the
photodiodes (34L) and (34B) are respectively irradiated with infrared rays from the equivalent
infrared lamps (2), and the impedance The values are equal to one another. By detecting this
other impedance and supplying it to the control circuit (101, first, 0J delay circuits (5L), (5K),
(5F) and (5B) are all equal in delay amount. The variable attenuation circuits (6L), (6R), (6F), and
(6B) become equal attenuation amounts, and the frequency characteristic variable circuits (7L),
(7R input (7F), (7B) are (7L) And (7R) is a flat characteristic, (7F) is a characteristic that enhances
high frequency, (7B) is a characteristic that attenuates high frequency, and IIT splitters (9F) and
(9B) are further divided So that the signals at the same level. Next, the listener [11 has the same
right and the photodiode on the left (34L) is strongly illuminated by the infrared lamp (2), the
impedance value decreases, and the photodiode on the right (3tR) tdm base plate ( 33R), the
impedance value increases, and the change in the impedance value causes the position of the
head of the listener to change correspondingly. By detecting this impedance value and supplying
the control circuit (IOIK, the variable delay circuit (5L), (5 ohms), (5F input (5B) reduces the delay
amount of (5L), and (5R) The amount of delay increases, and (5F), (5B) remain when the front
faces are equal, and ITrf attenuation DOM (6L), (6ft), (C6F), (6B) becomes equal attenuation
amount 1 In the frequency characteristic variable circuit (7L), (7R input (7F), (7B), (7L) is a
characteristic that enhances the band region, and '(711) is a characteristic that attenuates the
high region, (7F) 7B) is flat, and the OT variator (9F>, (98)) has a large level of <9h> iti rootbreaking ratio signal to mixing times M (12 L), '('12) L), (9g) is a small level to (121,) so that it is
supplied to the level t) 12tt,) should be supplied at a large level. Also, when the listener (11 has
the same left, the impedance value of the photodiode (34L +) on the left side is delayed, the
impedance 1 フ ォ ト of the photodiode (34R) on the right side decreases, and I when the listener
+ 11 of the same with the stone I! # If the game taker (1) tilts his head after #, he / she will move
by n 慄 14-Ejaculation (35b) The sliding shaft ′ of the variable “resistor (35a)” is reversed to
cause a change in resistance / value corresponding to the tilt angle of the head.
This resistance value is detected by the detection control circuit 110. The inclination
characteristic of the front and back of the 9% increases as the inclination angle of the frequency
characteristic variable circuit (7L), (71 (input (7F input (7B) ) So that the high region is
attenuated by% 1 h. EndPage: 3 According to the stereo reproducing apparatus of the present
invention described above, there are two channels, an electromagnetic wave generation source
for generating an electromagnetic wave having a wavelength of 3 crn or less provided at a
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predetermined position with respect to the listener, Receiver for receiving a pair of 1-toa waves
whose positions change with each other according to the rotation angle position with respect to
the reference plane, volume variable circuits respectively provided in a plurality of signal supply
paths to head 7 on, frequency characteristics M is configured to control at least one of a variable
circuit, a variable frequency characteristic circuit, and a variable delay circuit by setting M of at
least one of the 0T variable circuit and the variable delay circuit, and receiving sound of the
receiver. Because there is a @, even if the person turns his head while listening, the sound image
is always by changing the sound pressure level, the phase difference and the timbre of the sound
(π wave) to be heard with both ears accordingly @ Of 増The potential on the absolute position of
the circumference, the listener moves the head unconsciously during the hearing, by confirming
the position of the sound image, the listener can obtain the following sense of realism very good.
Further, according to the configuration to be expected, an infrared ray lamp (21, a photodiode
(34L) and (34B) as a receiver may be used as a generation source of electromagnetic waves, and
the configuration is very simple. In the above embodiment, infrared radiation is used as the
electromagnetic wave. However, any electromagnetic wave may be used as long as it is a
directional electromagnetic wave. For example, using a solid-state oscillator (a gun diode: trade
name) of microwaves Alternatively, an electromagnetic wave having a wavelength of about 3 cWI
may be emitted. In this case, reception is performed using a parabola antenna in order to obtain
directivity. For example, in the case of wavelength 3 crn, the diameter of the parabola antenna is
about 10 cr11. Furthermore, in the above-mentioned example, although the case where the
recording tape which carried out 4 channel recording using 4 microphones each was reproduced
was described, this is a signal of two or more channels recorded pseudo head recording (Pinaural
recording) or ordinary recording. You can use Further, the number and arrangement of
microphones which are sources of signals of two or more channels to be used are not limited to
the above-described example, and the number and volume characteristic variable circuits and
frequency characteristic variable circuits of a predetermined number corresponding to the
number and arrangement. By controlling the variable delay circuit with the characteristics of
7N5Z, it is possible to obtain the same effect of the invention as the above example.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram showing one embodiment of
a stereo reproduction apparatus according to the present invention, FIG. 2 is a block diagram
showing an example of a head 7 on applicable to the present invention, and FIG. 4 is a
connection diagram showing an example of a frequency characteristic variable circuit applicable
to the present invention, and FIG. 5 is applied to the embodiment of FIG. 1 It is a block diagram
which shows the example of the pseudo head microphone apparatus which can do. (11 is @ J12
渚, (21 is an infrared ray pair as an electromagnetic wave source, +31 is a head 7 on, (4) is a tape
recorder, (5L), (5FL), (5F) and (5B) is a town Zf1 respectively) Acupuncture circuit. (6L), (6B input
(6F) and (6B) are 41 variable attenuation circuits as a husband * iit variable circuit, and (7i,
inputs (7B input (7F) and (7B) are respective frequency seasonal variation circuits , (8 L) and (8
Le) are mixing circuits, (9 F) and (9 B) are variable dividers as one-time variable variable paths, (II
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is a control circuit, (3411) and (34)) are It is a photodiode as a receiver. EndPage: 4
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