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JPH01112900

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DESCRIPTION JPH01112900
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio reproducing apparatus. SUMMARY OF THE INVENTION The present invention changes the
characteristics of audio signals of the left and right channels according to the orientation of the
head of a listener when binaural reproduction is performed with headphones (including
earphones). By preparing data for memory in the memory, excellent reproduction characteristics
can be obtained. [Prior Art] Pinaural reproduction by headphones is a method excellent in the
sense of direction, localization and presence of a sound image. However, in the case of stereo
reproduction with a speaker, even if the listener changes the head (face) direction, the absolute
direction and position of the sound image does not change, and the relative direction and
position of the sound image felt by the listener changes On the other hand, in the case of
pinaural reproduction by headphones, even if the listener turns his head, the relative direction
and position of the sound image perceived by the listener does not change. For this reason, in the
pinaural reproduction with headphones, the sound field is formed in the head of the listener, it is
difficult to localize the sound image in front of the listener, and the sound image tends to rise.
Then, according to "Japanese Patent Publication No. 42-227", the following pinaural
reproduction method by headphones is considered. That is, since the sense of direction and the
sense of localization of the sound image are determined by the volume difference between the
sounds heard by the left ear and the right ear, the time difference, the phase difference, etc., in
the system of the above publication, the audio signal lines of the left and right channels Level
control circuit and variable delay circuit, respectively, detecting the head direction of the listener,
and controlling the level control circuit and variable delay circuit of the audio signal of each
channel by the detection signal to be comparable to stereo reproduction by the speaker To get a
sense of stereo sound field. [Problems to be Solved by the Invention] However, in the system of
the above-mentioned publication, the motor is driven by the detection signal of the head
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direction of the listener itself, and this motor controls the variable resistor and the variable of the
level control circuit and the variable delay circuit. Since the capacitor is controlled mechanically,
there is a time delay before the listener changes the head direction and changes the volume
difference and time difference of the audio signal of each channel supplied to the headphones,
which is practical. There is no In addition, when changing the volume difference and the time
difference, the change characteristics must be determined based on the relative positional
relationship between the sound source and the listener, the shape of the head of the listener, the
shape of the pinna, and the like.
That is, in the case of one change characteristic, the positional relationship between the sound
source and the listener is fixed, and the sense of distance can not be changed, and the shapes of
the head and pinna differ depending on the listener. , The degree of effect will vary. Therefore,
the system of the above publication is extremely difficult to realize from the point of
commercialization. The present invention is intended to solve such problems 9. [Means for
Solving the Problems] Therefore, in the present invention, by controlling the transfer function
and the delay time of the stereo audio signal supplied to the headphone of the listener or the like
according to the movement of the head of the listener, In the audio reproduction apparatus for
executing stereo reproduction by the headphone or the like, a circuit for changing a transfer
function and a variable delay circuit provided on a signal line of the audio signal of the left
channel among the stereo audio signals, and the stereo audio signal A transfer function changing
circuit and a variable delay circuit provided in a signal line of the right channel audio signal,
detection means for detecting the direction and magnitude of head movement of the listener with
respect to any reference direction, and the listener The above change circuit and variable delay
for the direction and magnitude of head movement And a memory in which control data of a
path is written as a table, the detection output of the detection means is converted into the
control data by the table of the memory, and the changed control data is changed by the change
circuit and the variable delay circuit An audio reproduction apparatus for changing the transfer
function and delay time of the stereo audio signal supplied as the control signal to the headphone
etc. in accordance with the direction and the magnitude of the head movement of the listener It is
[Operation] The volume difference and time difference of the audio signal of each channel
supplied to the headphones are changed in real time with respect to the movement of the
listener's head, and the change characteristic becomes suitable for the individual listener.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT In FIG. 1, (1) indicates a stereo
signal source from which audio signals of left and right channels of stereo, R are taken out. Then,
these signals, R, variable delay circuit (11), (41)-level control circuit (12), (42) → addition circuit
(13), (43) → variable resistor for volume control (14) , (44)-the left and right sounding units
(electro-acoustic transducers) (6L) and (6R) of the headphone (16) through the signal lines of the
output amplifier (15) and (45) respectively. Supplied as the main audio signal.
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In this case, each of the variable delay circuits (11) and (41) and the level control circuits (12)
and (42) is configured to change the delay time and gain (level) purely electronically with respect
to the control signal. Ru. Also, a level control circuit (12). (42) is formed of, for example, a
graphic equalizer capable of dividing an audio band into five and arbitrarily controlling its gain
for each of the divided bands. Furthermore, the headphones (6) have their sounding units (6L)
and (6R) combined by an inverted U-shaped band (6B) and are set so as to be set at the head of
the listener. Further, in the case of stereo reproduction by the speaker, acoustic and loss-talk are
caused between the left and right channels so that the reproduction sound of the speaker of the
left channel also reaches the right ear of the listener. Therefore, to simulate this, the signal from
the signal source (1), R is the variable delay circuit (21), (51) -level control circuit (22), (52) →
addition circuit (43), ( 13) are supplied as crosstalk components to the tone generation units (6R)
and (6L) of the opposite channel through the respective signal lines of (13). The circuits (21),
(51) and (22), (52) are also configured in the same manner as the circuits (11), (41) and (12),
(42). Signal from the signal source (1), R is supplied to the reverberation circuit (25), (55) to
expand the sense of expanse or presence in the sound field such as in a listening room or concert
hall. A reverberation signal is formed, and these signals are supplied to the tone generation units
(6L) and (6R) through the addition circuits (13) and (43). Furthermore, the band (6B) of the
headphone (6) is provided with detection means (71) for detecting the head orientation in the
horizontal plane of the listener. FIG. 2 shows an example of using the horizontal component of
geomagnetism as the detection means (71). That is, the rotary encoder (7R) is provided at the
central vertex of the headphone band (6B) so that the input axis thereof is in the vertical
direction, and the magnetic needle (7 !, 1) is provided on the input axis. Therefore, from the
rotary encoder (7R), an output indicating the direction of the head of the listener is taken with
reference to the north-south direction indicated by the magnetic needle (7M). Then, the output of
this encoder (71) is supplied to the detection circuits (72) and (73), and from the detection
circuit (72), when the listener turns the head clockwise and when it turns counterclockwise.
Then, the direction signal Sd changing to “0” or “1” is taken out, and from the detection
circuit (73), when the listener turns the head, the number of pulses Pa proportional to the
changed angle is For example, one pulse Pa is taken out every 2 ° change.
Then, the signal Sd is supplied to the count direction human power U / D of the up / down
counter (74), and the pulse Pa is supplied to the clock input (count input) CK of the counter (74),
and its count output is The control data is supplied as an address signal to the memory (77)
through the control circuit (75), and the control data is read from the corresponding address of
the table in the memo IJ (77), and this data is read out from the circuits (11), (12), ( 21). The
control signals are supplied to (22), (41), (42), (51) and (52) respectively. FIG. 3 shows an
example of data of a table in the memory (77). However, in this table, for the sake of simplicity,
the data of circuits (11), (12), (21). It converts into the transfer characteristic in (22), (41), (42),
(51), and (52), and shows. That is, now, as shown in FIG. 4, when the speakers (9L) and (9R) of
the left and right channels are disposed in front of the listener [8], the speakers (9L) and (9R) and
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the listener ( H (ω, θ) mn = A (ω, θ) mn-exp (jφ (ω, θ) mn) τ (θ) mn: As a transfer
characteristic between them and 8) from the speaker (9 m) to the listener (8) Delay time to reach
one ear (8n) of the) [φ (ω, phantom mn: same angle 5 m of the phase frequency characteristic
force (9 L), n: when considering L or R respectively, unit the angle θ The transfer function H (ω,
θ) mn and the delay time τ (ω, θ) mnO value (eight 1 straight per angle) when changing by
angle, for example 2 ° Has been written to. In addition, this table is provided, for example, three
sets for the memo 'J (77), and the values of data are different for each set according to the shape
of the head and pinna of the listener. Then, one of the three sets of tables is selected in
accordance with the switching of the switch (76) of the control circuit (75). In FIG. 1, (79) is a
reset switch, and when this is turned on, the count value of the counter (74) is reset to 1 all 0's,
and the table of the memo U (77) is θ = 0 An address is selected. According to such a
configuration, the audio signal from the signal source (1), R is supplied as the main audio signal
to the headphone (6) through the circuits (11) to (15), (41) to (45). As well as the circuits (21),
(22).
The crosstalk component is supplied to the headphone (6) through (51) and (52). In this case,
when the listener moves the head, the signals Sd and Pa according to the direction are obtained,
whereby the count value of the counter 74 becomes a value according to the head direction of
the listener, and this count value is Memo through the control circuit (75)! Since data is supplied
to J (77) as an address signal, data corresponding to the direction of the head of the listener is
taken out of the data corresponding to the table of FIG. 3 from the memory (77). The evening is
the circuit (11), (12), (21), (22), (41), (42). It is supplied to (51) and (52). Therefore, the audio
signal supplied to the headphone (6), R is a main audio signal having a transfer function H (ω,
θ) mn according to the head direction of the listener and a delay time r (θ) mn Since it becomes
a talk component, a stereo sound field feeling comparable to stereo reproduction by a speaker
can be obtained. At this time, the reverberation signal by the reverberation circuit (25), (55) is
also supplied to the headphone (6) to add a sense of spread in the listening room or the concert
hall. Thus, according to the present invention, at the time of stereo reproduction with the
headphone (6), a stereo sound field feeling comparable to stereo reproduction with the speaker
can be obtained. In this case, particularly according to the present invention Note this when
changing the characteristics of the audio signal supplied to the headphones (6) according to!
Since this is performed using the I (77) table, it is possible to finely change the orientation of the
listener's head and to obtain the optimum characteristics. Moreover, since the crosstalk
component is added and the characteristics of the crosstalk component are also controlled, it is
possible to obtain a better sense of stereo sound field. また、メモ! According to the table of J
(77), the characteristics of the circuits (11), (12), (21), (22>, (41), (42), (51), (52) are controlled
purely electronically Therefore, the change in the characteristics of the audio signal with respect
to the head movement of the listener is not delayed, and the unnaturalness as in the conventional
system is not generated. さらに、メモ! A plurality of tables are prepared for J (77), and the
listener can arbitrarily select this by the switch (76). Therefore, even if the shape of the head or
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pinna of the listener is different, Optimal characteristics can be obtained.
Furthermore, by changing the transfer function and the delay time for the change of the angle θ
to be larger or smaller than the standard value depending on the table, the amount of change of
the position of the sound image to the head direction of the listener is different. Thus, the sense
of distance from the listener to the sound image can be changed. Moreover, while adding a
reverberation signal by reverberation circuit (25) and (55), since this reverberation signal sounds
like reflection sound and reverberation by the wall of a hall etc., it listens to music as if it is a
famous concert hall You can get a sense of realism as if you In the above, h (t, θ) mn is also an
impulse response from the speaker (9 m) to the ear (9 n), so circuits (11, 12), (21, 22), (41, 42).
Each of (51, 52) may be a convolution integration circuit. Further, the data of FIG. 3 can be
obtained as follows. That is, the speakers in the left and right channels and the dummy head are
disposed in a room where reflection is relatively small, for example, an anechoic chamber, and a
small microphone is provided near the entrance of the ear canal of both ears of the dummy head.
Then, the measurement signals are reproduced from the speakers of the left and right channels,
collected by the microphone of the dummy head to measure the transfer function and the delay
time, and this measurement is performed for each predetermined angle θ of the dummy head. It
is good. Furthermore, in the above description, only the orientation of the listener's head in the
horizontal plane is considered, but the orientation in the vertical plane can be processed in the
same manner. Also, the table in the memory (77) can be one set, and the control circuit (75) can
change the designation of the address for the table to obtain control data as in the case where
there are a plurality of sets of tables. Furthermore, the data in the table may be limited to the
general head direction range of the listener, and the angle θ may be, for example, 0.5 ° around
θ == 0 °, 3 for 1θ1 ≧ 45 ° The intervals of the angles θ may be different depending on the
orientation, such as every other degree. Furthermore, instead of the headphones (6), speakers
arranged near both ears may be used. According to the present invention, when changing the
characteristics of the audio signal supplied to the headphones (6) according to the orientation of
the head of the listener, this is performed using the table of the memory (77>) Therefore, it is
possible to finely change the orientation of the listener's head and to make it the optimum
characteristic.
Moreover, since the crosstalk component is added and the characteristics of the crosstalk
component are also controlled, it is possible to obtain a stereo sound field feeling that is more
summery. Also, the characteristics of the circuits (11), (12>, (21), (22), (41), (42), (51), (52) are
controlled purely electronically according to the table of the memory (77) As a result, the change
in the characteristics of the audio signal with respect to the head movement of the listener is not
delayed, and the unnaturalness as in the conventional system is not generated. さらに、メモ! A
plurality of tables are prepared for J (77), and the listener can arbitrarily select this by the switch
(76). Therefore, even if the shape of the head or pinna of the listener is different, Optimal
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characteristics can be obtained. Furthermore, the amount of change of the transfer function and
the delay time with respect to the change of the angle θ is made larger or smaller than the index
I Its by the table (by this, the amount of change of the position of the sound image with respect
to the head direction of the listener is Since this is different, it is possible to change the sense of
distance from the listener to the sound image. Moreover, while adding a reverberation signal by
reverberation circuit (25) and (55), since this reverberation signal sounds like reflection sound
and reverberation by the wall of a hall etc., it listens to music as if it is a famous concert hall You
can get a sense of realism as if you
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a statistical diagram of an example of the present invention, and FIGS. 2 to 4 are
diagrams for explaining the same.
(1) is a stereo signal source, (11), (21), (41), (51) is a variable delay circuit, (12), (22), (42), (52) is
a level control circuit, (6 Is a headphone, (71) is a detection means, and (77) is a memory. Ms. Ito
Mamu Ito Matsumori Hidemori
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