Audio signal processing device

Abstract

The present invention addresses the problem of providing an audio signal processing device that achieves a good sense of positioning while maintaining sound quality. [Solution] The present invention is provided with: an overtone signal generation unit for generating an overtone signal AS including a signal obtained by multiplying the frequency of an audio signal S to be processed by k, k being an integer of 2 or more; a left audio signal generation unit that generates a left audio signal by convolving a head transfer function from the target positioning position of the audio signal S to the left ear of the listener with the audio signal S; a right audio signal generation unit that generates a right audio signal by convolving a head transfer function from the target positioning position to the right ear of the listener with the audio signal S; a left synthesis unit which synthesizes the left audio signal and the overtone signal to generate an audio signal L of a left channel; and a right synthesis unit that synthesizes the right audio signal and the overtone signal to generate an audio signal R of a right channel.

Description

Technical Field

[0001] This invention relates to an audio signal processing apparatus. Background Technology

[0002] An audio signal processing device is known that provides a sense of location of the sound image to the sound image positioning target position by convolving the acoustic transmission characteristics (head transfer function) from the sound image positioning target position to the left and right ears of the listener with the audio signal and then outputting it (e.g., Patent Document 1).

[0003] Existing technical documents: Patent documents: Patent Document 1: Japanese Patent No. 3395809. Summary of the Invention

[0004] The problem that the invention aims to solve: Because humans have a low ability to perceive the direction of narrow-band sound, even if the head transfer function is convolved with the audio signal with a narrow frequency band as described above, it sometimes cannot provide sufficient localization.

[0005] Furthermore, if the head transfer function is convolved with the audio signal before output, the sound quality of the output may be heterogeneous from the original audio signal.

[0006] Therefore, the objective of this invention is to achieve good positioning while maintaining the sonic quality of the audio signal.

[0007] Methods used to solve problems: To achieve the aforementioned goal, the present invention provides an audio signal processing apparatus comprising: an overtone signal generation unit that generates overtone signals, the overtone signals including a signal whose frequency is k times that of an audio signal to be processed (where k is an integer greater than or equal to 2); a left audio signal generation unit that convolves a head transfer function from the target location position of the audio signal to the listener's left ear with the target audio signal to generate a left audio signal; a right audio signal generation unit that convolves a head transfer function from the target location position to the listener's right ear with the target audio signal to generate a right audio signal; a left synthesis unit that synthesizes the left audio signal and the overtone signals to generate a left channel audio signal; and a right synthesis unit that synthesizes the right audio signal and the overtone signals to generate a right channel audio signal.

[0008] Furthermore, to achieve the aforementioned goal, the present invention provides an audio signal processing apparatus comprising: an overtone signal generation unit that generates overtone signals, the overtone signals including a signal whose frequency is k times that of an audio signal to be processed (where k is an integer greater than or equal to 2); a left overtone signal generation unit that generates a left overtone signal by adjusting the gain according to the direction of the target positioning position of the audio signal, such that the level of the overtone signal increases as the direction moves to the left; and a right overtone signal generation unit that generates a right overtone signal by adjusting the gain according to the direction of the target positioning position of the audio signal, such that the level of the overtone signal increases as the direction moves to the right. The gain is adjusted to be as high as possible to generate a right overtone signal; the left audio signal generation unit convolves the head transfer function from the target positioning position to the listener's left ear with the target audio signal to generate a left audio signal; the right audio signal generation unit convolves the head transfer function from the target positioning position to the listener's right ear with the target audio signal to generate a right audio signal; the left synthesis unit synthesizes the left audio signal and the left overtone signal to generate a left channel audio signal; and the right synthesis unit synthesizes the right audio signal and the right overtone signal to generate a right channel audio signal.

[0009] In addition, to achieve the aforementioned goal, the present invention provides an audio signal processing apparatus comprising: an overtone signal generation unit that generates an overtone signal, the overtone signal including a signal whose frequency is k times that of an audio signal to be processed (where k is an integer greater than or equal to 2); an overtone supplementary signal synthesis unit that synthesizes the object audio signal and the overtone signal to generate an overtone supplementary signal; a left channel audio signal generation unit that convolves the head transfer function from the target positioning position of the audio signal to the listener's left ear with the overtone supplementary signal to generate a left channel audio signal; and a right channel audio signal generation unit that convolves the head transfer function from the target positioning position to the listener's right ear with the overtone supplementary signal to generate a right channel audio signal.

[0010] Alternatively, the overtone signal generation unit described above can set each integer from 2 to n (where n≥k and n>2) as i, generate a signal that makes the frequency of the target audio signal i times for each i, and synthesize the generated signals to generate the overtone signal.

[0011] Furthermore, to achieve the aforementioned goal, the present invention provides an audio signal processing apparatus comprising: a left overtone signal generation unit that generates a left overtone signal, the left overtone signal comprising a signal whose frequency is k times that of a target left channel signal (where k is an integer greater than or equal to 2), the target left channel signal being the signal of the left channel of an audio signal consisting of left and right channels of the object being processed; and a right overtone signal generation unit that generates a right overtone signal, the right overtone signal comprising a target right channel signal whose frequency is L times that of the signal of the right channel of the audio signal (where L is an integer greater than or equal to 2). The signal is generated by: a left audio signal generation unit, which convolves the head transfer function from the target positioning position of the audio signal to the listener's left ear with the target left channel signal to generate a left audio signal; a right audio signal generation unit, which convolves the head transfer function from the target positioning position to the listener's right ear with the target right channel signal to generate a right audio signal; a left synthesis unit, which synthesizes the left audio signal and the left overtone signal to generate a left channel audio signal; and a right synthesis unit, which synthesizes the right audio signal and the right overtone signal to generate a right channel audio signal.

[0012] Furthermore, to achieve the aforementioned goal, the present invention provides an audio signal processing apparatus comprising: a left overtone signal generation unit that generates an overtone signal, the overtone signal including a signal whose frequency is k times that of a target left channel signal (where k is an integer greater than or equal to 2), the target left channel signal being the signal of the left channel of an audio signal consisting of left and right channels of the object being processed; a right overtone signal generation unit that generates an overtone signal, the overtone signal including a signal whose frequency is L times that of a target right channel signal (which is the signal of the right channel of the audio signal) (where L is an integer greater than or equal to 2); and a left overtone additional signal generation unit. The system comprises: a left channel audio signal generation unit, which synthesizes the left channel signal and the left overtone signal to generate a left overtone additional signal; a right overtone additional signal generation unit, which synthesizes the right channel signal and the right overtone signal to generate a right overtone additional signal; a left channel audio signal generation unit, which convolves the head transfer function from the target positioning position of the audio signal to the listener's left ear with the left overtone additional signal to generate a left channel audio signal; and a right channel audio signal generation unit, which convolves the head transfer function from the target positioning position to the listener's right ear with the right overtone additional signal to generate a right channel audio signal.

[0013] Alternatively, the left overtone signal generation unit may set each integer from 2 to n (where n ≥ k and n > 2) as i, generate a signal for each i such that the frequency of the left channel signal of the object becomes i times, and synthesize the generated signals to generate the left overtone signal. The right overtone signal generation unit may set each integer from 2 to m (where m ≥ L and m > 2) as i, generate a signal for each i such that the frequency of the right channel signal of the object becomes i times, and synthesize the generated signals to generate the right overtone signal.

[0014] According to the above audio signal processing device, an audio signal is generated by convolving the head transfer function with the object audio signal (which is the object of processing) and an overtone signal whose frequency is an integer multiple of the object audio signal, or by convolving the head transfer function with the overtone signal.

[0015] Therefore, it is possible to provide a good sense of localization by convolving the head transfer function with the object audio signal included in the generated audio signal, while suppressing the heterogeneity between the sound quality and the object audio signal by including the overtone signal in the generated audio signal.

[0016] Invention effects: As described above, according to the present invention, a good sense of positioning can be achieved while maintaining the sonic quality of the audio signal. Attached Figure Description

[0017] Figure 1 This is a diagram illustrating the configuration of an audio signal processing apparatus according to an embodiment of the present invention.

[0018] Figure 2 This is a diagram illustrating another configuration example of an audio signal processing apparatus according to an embodiment of the present invention.

[0019] Figure 3 This is a diagram illustrating the configuration of the overtone addition portion according to an embodiment of the present invention.

[0020] Figure 4 This is a diagram illustrating another configuration example of an audio signal processing apparatus according to an embodiment of the present invention.

[0021] Figure 5 This is a diagram illustrating another configuration example of an audio signal processing apparatus according to an embodiment of the present invention. Detailed Implementation

[0022] The embodiments of the present invention will be described below.

[0023] Figure 1 The configuration of the audio signal processing apparatus 1 of this embodiment is shown.

[0024] As shown in the figure, the audio signal processing device 1 is a device that performs signal processing on the mono audio signal S output by the audio source device 2 to obtain a sense of positioning, thereby generating a dual-channel audio signal of L (left) channel and R (right) channel, and outputting the audio signal to the left speaker 3 and the right speaker 4.

[0025] The audio signal processing device 1 includes an overtone generation unit 11, a head transfer function convolution unit 12, a positioning control unit 13, an overtone amplifier 14, an L-channel signal amplifier 15, an R-channel signal amplifier 16, an L-channel synthesizer 17, an R-channel synthesizer 18, an L-channel output amplifier 19, and an R-channel output amplifier 20.

[0026] In addition, the head transfer function convolution unit 12 includes a left ear head transfer function convolution unit 121 and a right ear head transfer function convolution unit 122.

[0027] The overtone generation unit 11 sets i to an integer from 1 to N (N≥2), generates the signal of the i-th harmonic of the audio signal S output by the sound source device 2 (the overtone signal), and synthesizes the generated signals and outputs them as signal AS.

[0028] However, the overtone generation unit 11 can also set i to an integer greater than or equal to 1 to generate the signal of the i-th harmonic of the audio signal S output by the sound source device 2 (the overtone signal) and output it as the signal AS.

[0029] The signal AS is adjusted to a specified gain by the overtone amplifier 14 and sent to the L-channel synthesizer 17 and the R-channel synthesizer 18.

[0030] The positioning control unit 13 sets the head transfer function from the positioning position to the listener's left ear in the left ear head transfer function convolution unit 121, and sets the head transfer function from the positioning position to the listener's right ear in the right ear head transfer function convolution unit 122, based on the positioning position of the sound image of the audio signal S set as the target.

[0031] Here, the location of the sound image of the audio signal S, which is the target, can also be determined by using the distance from the location to the listener as a specified distance, based on the direction of the set location relative to the listener.

[0032] The left ear head transfer function convolution unit 121 convolves the head transfer function set by the positioning control unit 13 with the audio signal S output by the sound source device 2 and outputs it as an audio signal LHS. The right ear head transfer function convolution unit 122 convolves the head transfer function set by the positioning control unit 13 with the audio signal S output by the sound source device 2 and outputs it as an audio signal RHS.

[0033] The audio signal LHS is adjusted to a specified gain level by the L-channel signal amplifier 15 and sent to the L-channel synthesizer 17. The audio signal RHS is adjusted to a specified gain level by the R-channel signal amplifier 16 and sent to the R-channel synthesizer 18.

[0034] The L-channel synthesizer 17 synthesizes the signal AS input from the overtone amplifier 14 and the audio signal LHS input from the L-channel signal amplifier 15, and outputs it to the left speaker 3 via the L-channel output amplifier 19. The R-channel synthesizer 18 synthesizes the signal AS input from the overtone amplifier 14 and the audio signal RHS input from the R-channel signal amplifier 16, and outputs it to the right speaker 4 via the R-channel output amplifier 20.

[0035] In addition, the gain of the overtone amplifier 14, the L-channel signal amplifier 15, and the R-channel signal amplifier 16 can be adjusted arbitrarily by the user to obtain a suitable sense of positioning and sound quality for the user.

[0036] Based on the configuration of such an audio signal processing device 1, a good sense of positioning can be provided by convolving the head transfer function with the audio signal S output by the sound source device 2, which is included in the output of the audio signal processing device 1. At the same time, the heterogeneity between the output of the audio signal processing device 1 and the audio signal S can be suppressed by the overtone signal generated by the overtone generation unit 11, which is included in the output of the audio signal processing device 1.

[0037] Here, the audio signal processing device 1 can also be as follows: Figure 2 It is constructed as shown.

[0038] As shown in the figure, the audio signal processing device 1 is relative to Figure 1 The configuration shown includes an L-channel overtone adjustment amplifier 101 and an R-channel overtone adjustment amplifier 102.

[0039] The L-channel overtone adjustment amplifier 101 adjusts the level of the signal AS input from the overtone amplifier 14 with the gain GL set by the positioning control unit 13, and outputs it to the L-channel synthesizer 17. The R-channel overtone adjustment amplifier 102 adjusts the level of the signal AS input from the overtone amplifier 14 with the gain GR set by the positioning control unit 13, and outputs it to the R-channel synthesizer 18.

[0040] In addition, the L-channel synthesizer 17 synthesizes the signal AS input from the L-channel overtone adjustment amplifier 101 and the audio signal LHS input from the L-channel signal amplifier 15, and outputs it to the left speaker 3 via the L-channel output amplifier 19. The R-channel synthesizer 18 synthesizes the signal AS input from the R-channel overtone adjustment amplifier 102 and the audio signal RHS input from the R-channel signal amplifier 16, and outputs it to the right speaker 4 via the R-channel output amplifier 20.

[0041] Furthermore, the positioning controller 13 controls the gain GL of the L-channel overtone adjustment amplifier 101 and the gain GR of the R-channel overtone adjustment amplifier 102 according to the positioning position of the sound image of the target audio signal S relative to the listener, so that the gain GL is larger and the gain GR is smaller as the direction is to the left, and the gain GR is larger and the gain GL is smaller as the direction is to the right.

[0042] Based on the configuration of such an audio signal processing device 1, the sense of sound localization represented by the audio signal S output by the audio signal processing device 1 can be further enhanced.

[0043] In addition, the above Figure 1 and Figure 2 The overtone generation unit 11 of the audio signal processing device 1 shown can also be replaced with Figure 3 The overtone addition 111 shown.

[0044] As shown in the figure, the overtone addition unit 111 includes the overtone generation unit 11, the fundamental tone level adjustment amplifier 1111, and the overtone fundamental tone synthesis unit 1112.

[0045] The pitch level adjustment amplifier 1111 adjusts the level of the audio signal S output by the sound source device 2 with a preset gain and outputs it to the overtone pitch synthesizer 1112. The overtone pitch synthesizer 1112 combines the output of the overtone generator 11 with the output of the pitch level adjustment amplifier 1111 and outputs it as the signal AS.

[0046] Here, when the gain of the pitch level adjustment amplifier 1111 is set to block the audio signal S, the output signal AS of the overtone addition unit 111 is equal to the output of the overtone generation unit 11. Furthermore, when the gain of the pitch level adjustment amplifier 1111 is set to allow the audio signal S to pass as is, the signal AS output by the overtone addition unit 111 includes the components of the audio signal S as is.

[0047] Furthermore, the fundamental level adjustment amplifier gain is set to a pre-tuned value to achieve the desired relationship between positioning and sound quality.

[0048] Alternatively, the configuration of the audio signal processing device 1 can be set as follows: Figure 4 The structure shown replaces Figure 1 and Figure 2 The structure shown.

[0049] exist Figure 4 In the configuration shown, the audio signal processing device 1 includes Figure 3 The overtone addition section 111, the head transfer function convolution section 12, the positioning control section 13, the L-channel output amplifier 19, and the R-channel output amplifier 20 are shown.

[0050] Furthermore, the overtone addition unit 111 is input to the audio signal S output by the sound source device 2, and the output AS of the overtone addition unit 111 becomes the input of both the left ear head transfer function convolution unit 121 and the right ear head transfer function convolution unit 12 of the head transfer function convolution unit 12.

[0051] Furthermore, the output of the left ear head transfer function convolution unit 121 is output to the left speaker 3 via the L channel output amplifier 19, and the output of the right ear head transfer function convolution unit 122 is output to the right speaker 4 via the R channel output amplifier 20.

[0052] Here, in Figure 4 In the configuration shown, the fundamental level adjustment amplifier 1111 of the overtone addition section 111 can be excluded, so that the signal AS output by the overtone addition section 111 includes the audio signal S as is.

[0053] Based on the configuration of such an audio signal processing device 1, a good sense of positioning can be provided by convolving the head transfer function with the audio signal S output by the sound source device 2, which is included in the output of the audio signal processing device 1. At the same time, by convolving the head transfer function with the overtone signal generated by the overtone generation unit 11, which is included in the output of the audio signal processing device 1, the heterogeneity between the output of the audio signal processing device 1 and the audio signal S can be suppressed to some extent.

[0054] The above describes this implementation method.

[0055] Here, the above shows the case where the audio source device 2 outputs a mono audio signal S, but this embodiment can also be applied to the case where the audio source device 2 outputs a dual-channel audio signal S.

[0056] That is, for Figure 1 , 2 The audio signal processing device 1, in Figure 1 In the audio signal processing device 1, for the case where the audio signal S output by the audio source device 2 is a two-channel signal, such as... Figure 5 As shown, a left overtone addition part 1201 and a right overtone addition part 1202 are provided instead. Figure 1 The overtone appendix 111. The left overtone appendix 1201 and the right overtone appendix 1202 have the same... Figure 1 It has the same structure and function as the overtone addition 111.

[0057] Additionally, amplifiers 1203 for the left harmonic and 1204 for the right harmonic are installed to replace... Figure 1 The overtones are produced by amplifier 14.

[0058] Furthermore, the audio signal LS of the L channel output by the audio signal processing device 1 is used as the input to the left overtone addition unit 1201, and the audio signal RS of the R channel output by the audio signal processing device 1 is used as the input to the right overtone addition unit 1202.

[0059] Additionally, the output of the left overtone adder 1201 is output to the L-channel synthesizer 17 via the left overtone amplifier 1203, and the output of the right overtone adder 1202 is output to the R-channel synthesizer 18 via the right overtone amplifier 1204.

[0060] Furthermore, the L-channel synthesizer 17 synthesizes the signal input from the left overtone amplifier 1203 and the audio signal LHS input from the L-channel signal amplifier 15, and outputs it to the left speaker 3 via the L-channel output amplifier 19. The R-channel synthesizer 18 synthesizes the signal AS input from the right overtone amplifier 1204 and the audio signal RHS input from the R-channel signal amplifier 16, and outputs it to the right speaker 4 via the R-channel output amplifier 20.

[0061] In addition, Figure 4 In the audio signal processing device 1, when the audio signal S output by the audio source device 2 is a two-channel signal, a left overtone addition unit 1201 and a right overtone addition unit 1202 are provided to replace... Figure 4 The overtone addition unit 111. Furthermore, the audio signal LS of the L channel output from the audio signal processing device 1 is used as the input to the left overtone addition unit 1201, and the audio signal RS of the R channel output from the audio signal processing device 1 is used as the input to the right overtone addition unit 1202. Additionally, the output of the left overtone addition unit 1201 is used as the input to the left ear head transfer function convolution unit 121, and the output of the right overtone addition unit 1202 is used as the input to the right ear head transfer function convolution unit 122.

[0062] Here, each of the above audio signal processing devices 1 outputs to the left speaker 3 and the right speaker 4, but the audio signal processing device 1 can also output to the audio recording device, and the audio signal output by the audio signal processing device 1 is recorded in the audio recording device.

[0063] Furthermore, the audio signal processing devices 1 described above can be used to convert game sound effects output from the sound source device 2 as audio signals S, warning sounds issued to passengers in a car, etc., into sound effects with a sense of location, and can be used as part of a game console, part of an in-vehicle audio system, etc.

[0064] Explanation of reference numerals in the attached figures: 1…Audio signal processing device, 2…Sound source device, 3…Left speaker, 4…Right speaker, 11…Overtone generation unit, 12…Head transfer function convolution unit, 13…Positioning control unit, 14…Overtone amplifier, 15…L-channel signal amplifier, 16…R-channel signal amplifier, 17…L-channel synthesizer, 18…R-channel synthesizer, 19…L-channel output amplifier, 20…R-channel output amplifier, 101…L-channel overtone adjustment amplifier, 102…R-channel overtone adjustment amplifier, 111…Overtone addition unit, 121…Left ear head transfer function convolution unit, 122…Right ear head transfer function convolution unit, 1111…Pitch level adjustment amplifier, 1112…Overtone pitch synthesis unit, 1201…Left overtone addition unit, 1202…Right overtone addition unit, 1203…Left overtone amplifier, 1204…Right overtone amplifier.

Claims

1. An audio signal processing device, characterized in that, have: The overtone signal generation unit generates overtone signals, which include signals that make the frequency of the target audio signal, which is the target audio signal, a multiple of k, where k is an integer greater than or equal to 2. The left audio signal generation unit convolves the head transfer function from the target location of the audio signal to the listener's left ear with the target audio signal to generate the left audio signal. The right audio signal generation unit convolves the head transfer function from the target positioning position to the listener's right ear with the target audio signal to generate a right audio signal; The left synthesizer combines the left audio signal and the overtone signal to generate the left channel audio signal; and The right synthesis unit combines the right audio signal and the overtone signal to generate the right channel audio signal.

2. An audio signal processing device, characterized in that, have: The overtone signal generation unit generates overtone signals, which include signals that make the frequency of the target audio signal, which is the target audio signal, a multiple of k, where k is an integer greater than or equal to 2. The left overtone signal generation unit generates a left overtone signal by adjusting the gain according to the direction of the target positioning position of the audio signal, such that the level of the overtone signal is higher the further to the left the direction is. The right overtone signal generation unit adjusts the gain according to the direction of the target positioning position of the audio signal, so that the level of the overtone signal is higher the further to the right the direction is, to generate a right overtone signal. The left audio signal generation unit convolves the head transfer function from the target positioning position to the listener's left ear with the target audio signal to generate a left audio signal; The right audio signal generation unit convolves the head transfer function from the target positioning position to the listener's right ear with the target audio signal to generate a right audio signal; The left synthesizer combines the left audio signal and the left overtone signal to generate the left channel audio signal; and The right synthesis unit combines the right audio signal and the right overtone signal to generate the right channel audio signal.

3. An audio signal processing device, characterized in that, have: The overtone signal generation unit generates overtone signals, which include signals that make the frequency of the target audio signal, which is the target audio signal, a multiple of k, where k is an integer greater than or equal to 2. The overtone additional signal synthesis unit synthesizes the target audio signal and the overtone signal to generate an overtone additional signal; The left channel audio signal generation unit convolves the head transfer function from the target location of the audio signal to the listener's left ear with the overtone additional signal to generate the left channel audio signal; and The right channel audio signal generation unit convolves the head transfer function from the target positioning position to the listener's right ear with the overtone additional signal to generate the right channel audio signal.

4. The audio signal processing apparatus according to any one of claims 1 to 3, characterized in that, The overtone signal generation unit sets each integer from 2 to n as i, generates a signal that makes the frequency of the target audio signal i times for each i, and synthesizes the generated signals to generate the overtone signal, where n≥k and n>2.

5. An audio signal processing device, characterized in that, have: A left overtone signal generation unit generates a left overtone signal, which includes a signal that makes the frequency of the left channel signal of the object k times. The left channel signal of the object is the signal of the left channel of the audio signal composed of the left and right channels of the object being processed, where k is an integer greater than or equal to 2. The right overtone signal generation unit generates a right overtone signal, which includes a signal whose frequency is L times that of the target right channel signal, which is the right channel signal of the audio signal, and L is an integer greater than or equal to 2. The left audio signal generation unit convolves the head transfer function from the target positioning position of the audio signal to the listener's left ear with the left channel signal of the target to generate a left audio signal. The right audio signal generation unit convolves the head transfer function from the target positioning position to the listener's right ear with the object's right channel signal to generate a right audio signal; The left synthesizer combines the left audio signal and the left overtone signal to generate the left channel audio signal; and The right synthesis unit combines the right audio signal and the right overtone signal to generate the right channel audio signal.

6. An audio signal processing device, characterized in that, have: A left overtone signal generation unit generates an overtone signal, which includes a signal that makes the frequency of the left channel signal of the object k times. The left channel signal of the object is the signal of the left channel of the audio signal composed of the left and right channels of the object being processed, where k is an integer greater than or equal to 2. The right overtone signal generation unit generates an overtone signal, which includes a signal that makes the frequency of the target right channel signal, which is the right channel signal of the audio signal, L times, where L is an integer greater than or equal to 2. The left overtone additional signal synthesis unit synthesizes the left channel signal of the object and the left overtone signal to generate a left overtone additional signal; The right overtone additional signal synthesis unit synthesizes the right channel signal of the object and the right overtone signal to generate a right overtone additional signal; The left channel audio signal generation unit convolves the head transfer function from the target location of the audio signal to the listener's left ear with the left overtone additional signal to generate the left channel audio signal; and The right channel audio signal generation unit convolves the head transfer function from the target positioning position to the listener's right ear with the right overtone additional signal to generate the right channel audio signal.

7. The audio signal processing apparatus according to claim 5 or 6, characterized in that, The left overtone signal generation unit sets each integer from 2 to n as i, and for each i, generates a signal such that the frequency of the left channel signal of the target is i times the original frequency. The generated signals are then combined to generate the left overtone signal, where n ≥ k and n > 2. The right overtone signal generation unit sets each integer from 2 to m as i, generates a signal that makes the frequency of the right channel signal of the object i times for each i, and synthesizes the generated signals to generate the right overtone signal, where m≥L and m>2.

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