JPH06225399A - Method for imparting sound source moving feeling - Google Patents

Abstract

PURPOSE:To provide a method capable of securing the continuity of the moving feeling of a sound source even though a speaker interval is wide and the moving speed of the sound source is slow by controlling the total sum of acoustic energy or sound pressure in a listener position at a constant. CONSTITUTION:A controller 3 considers the arrangement and the number of plural speakers 5, calculates gain for original sound source signals so that the total sum of the sound pressure or the acoustic energy emitted from the respective speakers 5 in the listener position become constant or similar thereto based on the signals of a position information signal source 2 and convolutes it to the signals of an original acoustic signals source 1 to be inputted. Then, acoustic signals to which position information is convoluted are delivered to respective acoustic channels 4 and reproduced by the speakers 5. By the constitution, the method for imparting the moving feeling of the sound source provided with a function capable of adjusting the envelope of emitted sound waveforms from the speakers so as to impart the continuous moving feeling to a listener even though the speaker interval is wider and the moving speed is slower can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention sequentially emits sound to the same sound field by using a plurality of speakers to realize a sense of movement of a sound source, with a wider speaker interval and a slower movement speed. The present invention relates to a method for imparting a sense of movement of a sound source having a function of adjusting the envelope of a sound wave waveform emitted from a speaker, in order to impart a sense of continuous movement to a listener.

[0002]

2. Description of the Related Art In order to realize a feeling of movement of a sound source, according to a conventional method, the speakers 5A, 5B and 5C shown in FIG.
Signals SA, SB, and SC shown in A, B, and C are sequentially given, and the positions of the sound images are sequentially moved to the positions of the speakers 5A, 5B, and 5C. In this case, the envelope of the sound wave waveforms emitted from the speakers 5A, 5B, 5C is simply
The rising portion and the falling portion of the envelope of the radiated sound wave waveform from 5C are obtained by only changing the signal intensity symmetrically and linearly as shown in FIG. 5, and the shape of the envelope showing the change of the signal intensity is considered. Didn't.

[0003]

Therefore, when the speaker for emitting sound is switched to the adjacent speaker, discontinuity is likely to occur in the movement feeling of the sound, and in order to maintain the continuity of the movement feeling, the speaker is There were restrictions such as narrowing the space between the two and increasing the moving speed. An object of the present invention is to realize a moving sensation of a sound source with a wider range of speakers as compared with the conventional one, and to provide a listener with a continuous moving sensation even at a slower moving speed. An object of the present invention is to provide a method of imparting a feeling of movement of a sound source having a function of adjusting an envelope.

[0004]

According to the present invention, when a feeling of movement of a sound source is realized by successively radiating sounds in the same sound field using a plurality of speakers, the envelope of the radiated sound wave waveform from each speaker is received. It has a function to continuously control the gain of the acoustic signal with respect to the original sound source signal so that the total amount of acoustic energy or sound pressure at the listener's position is constant or equivalent, and has a function of switching the speaker pair to which the acoustic signal is input. Thus, even if the moving speed of the sound source is slow and the speaker interval is wide, the envelope of the radiated sound wave from each speaker is adjusted so that the listener can have a sense of continuous movement of the sound source in the direction of the virtual real sound source. It proposes a sound source movement feeling imparting method.

According to the sound source movement sensation imparting method of the present invention, continuity of the movement sensation of the sound source is ensured even if the speaker interval is wide and the moving speed of the sound source is slow.

[0006]

FIG. 1 shows an embodiment of the present invention. In this embodiment, a sound image corresponding to one sound source that gives a good sense of movement is reproduced by using a plurality of (n) speakers and controlling the signal intensity ratio to each speaker. FIG. 1 shows an original acoustic signal source, 2 is a position information signal source of a sound image, and 3 is a control device which distributes the signal of the original acoustic signal source 1 to each acoustic channel with an appropriate gain based on the signal of the positional information signal source 2. Indicates an acoustic channel, and 5 indicates n reproducing speakers.

The acoustic signal and the position information signal of the sound source are input by the original acoustic signal source 1 and the position information signal source 2, respectively. Based on the signal from the position information signal source 2 in consideration of the arrangement and the number of the speakers 5 in the control device 3, the total of acoustic energy or sound pressure radiated from each speaker 5 is constant at the listening position or conforms to it. The gain for the original sound source signal is calculated and convolved with the signal of the original acoustic signal source 1. The acoustic signal in which the position information is convoluted is delivered to each acoustic channel 4, and the speaker 5 reproduces the acoustic signal.

For example, as shown in FIG. 2, three speakers 5A, 5 are provided at the front of the listener 6 and at the right and left θ degrees (θ> 0).
An example is shown in which B and 5C are arranged and the acoustic energy at the listening position is controlled to be constant. The gain of the acoustic signal to each speaker 5A, 5B, 5C with respect to the original acoustic signal is Ga,
Let Gb and Gc. At this time, the speakers 5A, 5B,
Since the total sum of acoustic energy emitted from 5C is constant, | Ga | ² + | Gb | ² + | Gc | ² = G (constant value) ... (1) must be satisfied. An example of the gains Ga, Gb, and Gc of each channel when the sound image is moved from the left θ degree to the right θ degree on the horizontal plane at the speed of θ degree per second is shown below. Ga = G [0 <t <(T-α _T ) / 2] = G cos {π (t- (T-α _T ) / 2) / 2α _T } [(T-α _T ) / 2 <t < (T + α _T ) / 2] = 0 [(T + α _T ) / 2 <t <2] Gb = 0 [0 <t <(T-α _T ) / 2] = G sin (π (t- (T-α _T ) / 2) / 2α _T ) [(T−α _T ) / 2 <t <(T + α _T ) / 2] = G [(T + α _T ) / 2 <t <(3T + α _T ) / 2] = G cos {π (t- (3T + α _T ) / 2) / 2α _T } [(3T + α _T ) / 2 <t <(3T + 3α _T ) / 2] = 0 [(3T + 3α _T ) / 2 <t <2] Gc = 0 [0 <t <(3T + α _T ) / 2] = G sin (π (t- (3T + α _T ) / 2) / 2α _T ) [(3T + α _T ) / 2 <t <( 3T + 3α _T ) / 2] = G [(3T + 3α _T ) / 2 <t <2] A schematic diagram of the gains Ga, Gb, and Gc is shown in FIG.

In addition to the above function, the energy in each direction is made equal to that when a real sound source is used, that is, | Ga | ² sin θ− | Gc | ² sin θ = g ² sin (−φt + φ ) [0 <t <2] ... (2) | Ga | ² cos θ + | Gb | ² cos θ + | Gc | ² cos θ = g ² cos (−φt + φ) [0 <t <2] …… ...... (3) Gc = 0 [0 <t <1] ...... (4) Ga = 0 [1 <t <2] …… (5) (where g is a variable depending on t) ( Various functions can be applied, such as using gains Ga, Gb, and Gc that simultaneously satisfy the expressions (1) to (5).

[0010]

As described above, according to the present invention,
Even if the moving speed of the sound source is slow and the speaker interval is wide, the sound quality is not impaired, and the listener can be provided with a good sense of localization and a feeling of movement corresponding to the moving sound.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining an embodiment of the present invention.

FIG. 2 is a layout diagram for explaining a specific example of the present invention.

FIG. 3 is a graph for explaining the operation of FIG.

FIG. 4 is a layout diagram for explaining a conventional technique.

5 is a waveform diagram for explaining a signal given to the speaker shown in FIG.

[Explanation of symbols]

 1 Original acoustic signal source 2 Position information signal source 3 Control device 4 Acoustic channel 5 Speaker 6 Listener Ga, Gb, GC Gain of each acoustic channel

Claims (1)

[Claims] 1. In the case of realizing a sense of movement of a sound source by sequentially radiating sound to the same sound field using a plurality of speakers, the envelope of a sound wave waveform radiated from each speaker is converted into acoustic energy at a listener position. By continuously controlling the gain of the acoustic signal with respect to the original sound source signal so that the total sound pressure is constant or equivalent, and by having the function of switching the speaker pair to which the sound signal is input, the moving speed of the sound source Sound source movement characterized by adjusting the envelope of the radiated sound wave from each speaker so that the listener can have a sense of continuous movement of the sound source in the direction of the virtual real sound source even if it is slow and the speaker spacing is wide Sense-imparting method.