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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio signal reproduction apparatus for reproducing an audio signal by means of a headphone
2. Description of the Related Art For example, in Japanese Patent Laid-Open No. 3-214897, in an
acoustic signal reproducing apparatus for reproducing an acoustic signal by a headphone device,
the transfer characteristic processing is performed on a constant transfer characteristic from a
virtual sound source to both ears of a listener. Means for giving to the left channel and right
channel acoustic signals, and for the acoustic signals of each channel processed by the transfer
characteristic processing means the level difference and the time difference according to the
change in the head direction of the listener There is disclosed an acoustic signal reproduction
apparatus adapted to perform appropriate binaural reproduction with respect to a virtual sound
source by providing the signal processing means.
However, in the above-mentioned conventional apparatus, the virtual sound source position is
not moved by the headphone apparatus even when the listener moves by rotating the head or the
like, and the sound is not detected. There is no interest as a playback device.
The present invention has been made in view of such conventional problems, and the special
sound effect by the intermittent rotation of the record as performed in a disco etc. is performed
in accordance with the movement of the listener to obtain the sense of presence The purpose is
to enhance the sense of reality in difficult headphone reproduction.
SUMMARY OF THE INVENTION The present invention is a variable coefficient multiplier that
inputs two audio signals from a signal source and attenuates the level of the signals at an
appropriate ratio. An amplifier for amplifying the output of each multiplier at the same ratio, a
headphone device mounted on the head of the listener and driven based on the reproduced
acoustic signal from the amplifier, and the listener provided in the headphone device And a
control unit for adjusting the coefficient of the multiplier based on a detection signal from the
detection unit.
The movement of the listener is detected by the detection means, and the attenuation amount of
the two systems of sound signals input is adjusted according to the speed of the movement to
change the level and balance etc. of the reproduction sound signal. .
apparatus according to the present invention will be described in detail with reference to the
FIG. 1 is a block circuit diagram showing a schematic configuration of an acoustic signal
reproduction apparatus.
In FIG. 1, reference numeral 1 denotes an acoustic signal source that generates acoustic signals
of left and right two systems.
Reference numerals 2L and 2R denote variable coefficient multipliers which change the
amplitude of each sound signal or change the balance between the left and right by multiplying
the sound signal of the above system by an appropriate multiplication coefficient.
A headphone amplifier 3 amplifies the outputs of the variable coefficient multipliers 2L and 2R
appropriately and supplies them to the left and right speakers 4L and 4R of the headphone
device 4.
Reference numeral 5 denotes a rotational speed detecting means (angular velocity sensor) which
is attached to the top of the headphone device and detects the rotational speed of the head of the
The detection means detects the magnitude of the movement of the listener.
Reference numeral 6 denotes a parameter generator as a control device which receives the
detection signal (voltage) of the detection means 5 and calculates the coefficients of the variable
coefficient multipliers 2L and 2R according to the signal value.
The generator 6 is composed of a DSP (Digital Signal Processor), and obtains appropriate
multiplication coefficients for the multipliers 2L and 2R respectively according to a table of
relative motion amounts and multiplication coefficients prepared in advance.
Specifically, the generator 6 compares the magnitude of the input signal with the relative motion
amount set in the table.
For example, in the case of adding sound intensity according to the movement of the listener, a
table of relative motion amounts and multiplication coefficients as shown in FIG. 2 is used.
In this case, assuming that the signal input from the detection means 5 has an absolute value of
0.15, the magnitude comparison with 1.0, 0.9, 0.8, ... 0.2, 0.2 It is small for the first time, and
when it is compared with 0.1, it becomes larger for the first time and the magnitude relationship
is reversed.
Therefore, the detection signal of 0.15 is determined to be a value in the range of relative motion
amount 0.1 to 0.2, and multiplication coefficients a1 = 0.2 and a2 = 0.2 are output, and
accordingly, the input The acoustic signal thus obtained is attenuated by the multipliers 2L and
2R, and the sound reproduced by the headphone device 4 becomes small.
Such an operation is carried out each time the angular velocity is detected in accordance with the
movement of the listener, and it becomes possible to enjoy the reproduced sound heard by the
vibrancy of the sound.
However, in this example, the balance between the left and right of the sound signal uses the
balance itself of the input sound signal, and the position of the virtual sound source does not
Next, consider the case where the position of the virtual sound source is changed in accordance
with the movement of the listener.
In this case, the table of FIG. 3 may be used.
That is, the coefficient values of the multipliers 2L and 2R may be changed according to the value
of the relative motion amount, and unlike the case of FIG. 2, the input signal is not an absolute
value but a signal having a positive / negative sign.
When the input signal is +0.15 as in the previous example, the coefficients are a1 = 0.6 and a2 =
0.4, and the balance between the left and right reproduction outputs is different from that of the
input sound signal. Balance.
In this case, the position of the detection means 5 of the headphone device 4 is set to zero, and
the movement in the left direction is taken as positive and the right as negative.
Furthermore, if the frequency characteristics of the left and right sound signals are changed by
the movement of the listener, it is necessary to reproduce the frequency change of the sound
when the head is shaken from side to side with the usual two front speakers such as the Doppler
effect. Is also possible.
As described above, the present invention overcomes the lack of presence due to headphone
reproduction by changing the amplitude of the input sound signal and the balance between the
left and right according to the movement of the listener as described above. It is possible to
expect an effect of reproducing a realistic sound due to a change in volume or a change in
balance in accordance with the movement of the listener.
Brief description of the drawings
1 is a circuit block diagram of the acoustic signal reproduction apparatus of the present
2 is an example of a coefficient table of the control parameter generator.
3 is another example of the coefficient table of the control parameter generator.
Explanation of sign
1 sound signal source 2L, 2R variable coefficient multiplier 3 headphone amplifier 4 headphone
device 5 detection means 6 control parameter generator
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