Audio-signal processing device, audio device, and audio-signal processing program

Abstract

An audio-signal processing device (1A) includes: a processor (4) having a first input unit (411), a second input unit (412), a first output unit (421), and a second output unit (422); and an audio transformer (6A) provided on a path for electrically connecting the first output unit (421) and the second input unit (412), in which the processor (4) outputs, from the first output unit (421) to the audio transformer (6A), a voice signal to be input to the first input unit (411) and outputs, from the second output unit (422), a voice signal to be input from the audio transformer (6A) to the second input unit (412).

Description

Audio signal processing device, acoustic device, and audio signal processing program

[0001] The present invention relates to an audio signal processing device, an acoustic device, and an audio signal processing program.

[0002] Conventionally, a signal processing circuit that processes an audio signal and outputs the processed signal to a speaker system is known (see, for example, Patent Document 1). The signal processing circuit described in Patent Document 1 processes a digital audio signal input to an input terminal using a DSP (Digital Signal Processor), converts the signal into an analog signal using a D / A converter, and then outputs the signal to the speaker system via an amplifier circuit. The speaker system converts the input analog signal into a sound wave and outputs the sound wave.

[0003] JP 2014-138226 A

[0004] In the signal processing circuit described in Patent Document 1, a technology is proposed in which an amplifier circuit is configured with a transformer and components that become harmonics of the audio based on the input audio signal are added. However, when a DSP has multiple output terminals and the signal processing circuit has multiple output systems, there is a problem in that a transformer must be provided for each of the multiple output systems. For this reason, there has been a demand for an audio signal processing device that can simplify the configuration.

[0005] An audio signal processing device according to a first aspect of the present invention comprises a processor having a first input section, a second input section, a first output section, and a second output section, and an audio transformer provided on a path electrically connecting the first output section and the second input section, wherein the processor outputs an audio signal input to the first input section from the first output section to the audio transformer, and outputs the audio signal input from the audio transformer to the second input section from the second output section.

[0006] An audio signal processing device according to a second aspect of the present invention is an audio signal processing device comprising a processor to which an audio signal is input, the processor comprising: a signal separation means for separating from the input audio signal a target signal to which harmonics are to be added and non-target signals other than the target signal; a harmonic component addition means for adding harmonic components that are harmonics of audio corresponding to the target signal to the target signal; and a signal output means for outputting the target signal to which the harmonic components have been added.

[0007] An acoustic device according to a third aspect of the present invention includes the audio signal processing device according to the first or second aspect.

[0008] An audio signal processing program according to a fourth aspect of the present invention causes a processor to which an audio signal is input to function as a signal separation means for separating, from the input audio signal, a target signal to which harmonics are to be added and non-target signals other than the target signal, a harmonic component addition means for adding harmonic components that are harmonics of the audio corresponding to the target signal to the target signal, and a signal output means for outputting the target signal to which the harmonic components have been added.

[0009] A block diagram showing the configuration of an audio device in a first embodiment. A block diagram showing the configuration of an audio device in a second embodiment. A block diagram showing the configuration of an audio device in a third embodiment. A block diagram showing the configuration of a processor in the third embodiment. A flowchart showing audio signal processing in the third embodiment.

[0010] [First Embodiment] A first embodiment of the present invention will be described below with reference to the drawings. [Configuration of Audio Device] FIG. 1 is a block diagram showing the configuration of an audio device AD1 according to this embodiment. The audio device AD1 is a DJ device such as a DJ mixer or DJ player, and is an electronic device that processes and outputs input audio signals. For example, the audio device AD1 adds effects selected by the user to the input audio signals and adds harmonic components that become harmonics of the audio based on the audio signals. Furthermore, for example, if the audio device AD1 has a mixing function, the audio device AD1 mixes the audio signal of an input first song and the audio signal of an input second song. Such an audio device AD1 includes an audio signal processing device 1A, as shown in FIG. 1.

[0011] [Configuration of Audio Signal Processing Device] The audio signal processing device 1A processes and outputs an input audio signal. Specifically, the audio signal processing device 1A performs processing such as adding the above-mentioned harmonic components to the input audio signal. The audio signal processing device 1A includes an input system 2, a signal processing system 3A, and an output system 8.

[0012] [Configuration of the Input System] The input system 2 is a part of the audio signal processing device 1A to which an audio signal is input. The input system 2 includes an analog input terminal 21, an A / D converter 22, and a digital input terminal 23. The analog input terminal 21 is a terminal to which an analog audio signal is input. The analog input terminal 21 outputs the input audio signal to the A / D converter 22. Examples of the analog input terminal 21 include an RCA terminal and a phone terminal. The A / D converter 22 converts the analog audio signal input from the analog input terminal 21 into a digital audio signal and outputs it. The digital audio signal output from the A / D converter 22 is input to a first input unit 411 of a DSP 4 (described later) of the signal processing system 3A. The digital input terminal 23 is a terminal to which a digital audio signal is input. The digital audio signal input to the digital input terminal 23 is input to the first input unit 411 of the DSP 4. Examples of such a digital input terminal 23 include a USB terminal, an optical digital terminal, and a coaxial digital terminal. In this way, the audio signal processing device 1A includes a plurality of input terminals connected to the first input unit 411.

[0013] [Configuration of the Output System] The output system 8 will be described first. The output system 8 outputs the audio signal processed by the signal processing system 3A to the outside of the audio signal processing device 1A, and ultimately to the outside of the acoustic device AD1. The output system 8 includes a first signal output system 81, a second signal output system 82, a third signal output system 83, a fourth signal output system 84, a fifth signal output system 85, and a sixth signal output system 86. For example, the first signal output system 81 is a first master output, and the second signal output system 82 is a second master output.

[0014] Each of the signal output systems 81 to 85 has a pair of a D / A converter and an output terminal which is an audio output terminal. Specifically, the first signal output system 81 has a D / A converter 811 and a first output terminal 812. The second signal output system 82 has a D / A converter 821 and a second output terminal 822, and the third signal output system 83 has a D / A converter 831 and a third output terminal 832. The fourth signal output system 84 has a D / A converter 841 and a fourth output terminal 842, and the fifth signal output system 85 has a D / A converter 851 and a fifth output terminal 852. The D / A converters 811, 821, 831, 841, and 851 convert digital audio signals input from the second output unit 422 of the DSP 4 of the signal processing system 3A into analog audio signals. An audio cable can be individually connected to each of the output terminals 812, 822, 832, 842, and 852. Each of the output terminals 812, 822, 832, 842, and 852 is a terminal to which an audio signal can be input from a second output unit 422 (described later) of the DSP 4. The output terminals 812, 822, 832, 842, and 852 output analog audio signals input from the corresponding D / A converters 811, 821, 831, 841, and 851.

[0015] The sixth signal output system 86 has a USB output terminal 861, which is a USB terminal. The USB output terminal 861 is a terminal to which an audio signal can be input from the second output unit 422 of the DSP 4. The audio signal output from the second output unit 422 of the DSP 4 is a digital signal, and the audio signal output from the USB output terminal 861 is also a digital signal. In other words, the USB output terminal 861 is a digital output terminal. For this reason, a D / A converter is omitted from the sixth signal output system 86.

[0016] [Configuration of Signal Processing System] The signal processing system 3A processes an audio signal input from the input system 2, and outputs the audio signal to a selected signal output system from among the signal output systems 81 to 86 of the output system 8. The signal processing system 3A includes a DSP 4, a D / A conversion unit 5A, an audio transformer 6A, and an A / D conversion unit 7.

[0017] [DSP Configuration] The DSP 4 is a processor that processes audio signals input from the input system 2 and outputs the signals to the D / A conversion unit 5A or the output system 8. The DSP 4 has a first input unit 411, a second input unit 412, a first output unit 421, and a second output unit 422. The first input unit 411 is connected to the input system 2. A digital audio signal is input to the first input unit 411 from the input system 2. The second input unit 412 is connected to the A / D conversion unit 7. A digital audio signal is input to the second input unit 412 from the A / D conversion unit 7. The first output unit 421 is connected to the D / A conversion unit 5A. The first output unit 421 outputs the audio signal to each D / A converter 51 (described later) of the D / A conversion unit 5A. More specifically, the first output unit 421 outputs, of the audio signals, a left audio signal to the D / A converter 51L and a right audio signal to the D / A converter 51R. The second output unit 422 is connected to the output system 8. The second output unit 422 outputs the audio signal to a D / A converter of a signal output system selected by the user from among the signal output systems 81 to 86 included in the output system 8. The functions of the DSP 4 will be described in detail later.

[0018] [Arrangement of D / A conversion unit, audio transformer, and A / D conversion unit] The D / A conversion unit 5A, audio transformer 6A, and A / D conversion unit 7 are provided on a path that electrically connects the first output unit 421 and the second input unit 412. More specifically, the D / A conversion unit 5A, audio transformer 6A, and A / D conversion unit 7 are arranged in the order in which the audio signal flows from the first output unit 421 to the second input unit 412.

[0019] [Configuration of D / A Conversion Unit] The D / A conversion unit 5A converts the digital audio signal input from the first output unit 421 of the DSP 4 into an analog audio signal and outputs it to the audio transformer 6A. The D / A conversion unit 5A has two D / A converters 51. The two D / A converters 51 include D / A converters 51L and 51R. The D / A converter 51L converts the digital left audio signal input from the DSP 4 into an analog left audio signal. The analog left audio signal converted by the D / A converter 51L is input to a left transformer 61L of the audio transformer 6A. The D / A converter 51R converts the digital right audio signal input from the DSP 4 into an analog right audio signal. The analog right audio signal converted by the D / A converter 51R is input to a right transformer 61R of the audio transformer 6A.

[0020] [Configuration of Audio Transformer] The audio transformer 6A is an electronic component that imparts a tone effect by adding harmonic components, which are harmonics of the audio corresponding to the audio signal, to the audio signal input from the D / A conversion unit 5A. The audio transformer 6A has a left transformer 61L and a right transformer 61R that add the harmonic components. The left transformer 61L receives a left audio signal included in the audio signal input to the first input unit 411 via the D / A converter 51L from the DSP 4. The left transformer 61L adds harmonic components, which are harmonics of the left audio corresponding to the left audio signal, to the input analog left audio signal. The right transformer 61R receives a right audio signal included in the audio signal input to the first input unit 411 via the D / A converter 51R from the DSP 4. The right transformer 61R adds harmonic components, which are harmonics of the right audio corresponding to the right audio signal, to the input analog right audio signal. The transformers 61L and 61R output the left and right audio signals to which the harmonic components have been added to the A / D converter 7, respectively.

[0021] [Configuration of A / D Conversion Unit] The A / D conversion unit 7 converts the analog audio signal input from the audio transformer 6A into a digital audio signal. The A / D conversion unit 7 has an A / D converter 71, and converts the analog left audio signal into a digital left audio signal and the analog right audio signal into a digital right audio signal using the A / D converter 71. The A / D conversion unit 7 outputs the left audio signal and the right audio signal, which have been converted into digital signals, to the second input unit 412 of the DSP 4.

[0022] [DSP Functions] The DSP 4 can perform level adjustment, mixing, and effect application on the audio signals input from each of the first input unit 411 and the second input unit 412. Specifically, the DSP 4 adjusts the level of the audio signal input to the first input unit 411 and the level of the audio signal input to the second input unit 412 in response to a user operation. The DSP 4 also mixes the audio signals of the first music piece and the second music piece in response to a user operation when they are input from the input system 2. The DSP 4 also applies an effect selected by the user to the audio signals input to each of the first input unit 411 and the second input unit 412. Examples of such effects include echo, delay, spiral, helix, and reverb. The DSP 4 also switches the input signals to the DSP 4. Specifically, the DSP 4 switches the input terminal that outputs the audio signal to the first input unit 411 from among the multiple input terminals that make up the input system 2 .

[0023] The DSP 4 further has the following functions: The DSP 4 has a function of adjusting the proportion of audio signals input from the first input unit 411 to be output to the first output unit 421 and the proportion of audio signals to be output to the second output unit 422. For example, when no harmonics are added to the audio signals by the audio transformer 6A, the DSP 4 outputs the audio signals input to the first input unit 411 from the second output unit 422 to the output system 8 without outputting them to the first output unit 421. For example, when a predetermined proportion of harmonic components are added to the audio signals by the audio transformer 6A, the DSP 4 outputs a predetermined proportion of the audio signals input to the first input unit 411 from the first output unit 421 and outputs the remaining audio signals from the second output unit 422.

[0024] The DSP 4 has a function of adjusting the level of the audio signal output from the first output unit 421 and the level of the audio signal output from the second output unit 422. Specifically, the DSP 4 adjusts the level of the audio signal input to the first input unit 411 and output from the first output unit 421, and the level of the audio signal input to the second input unit 412 and output from the second output unit 422. For example, the DSP 4 can adjust the level of the audio signal input to the first input unit 411 and output from the first output unit 421 to adjust the degree of timbre effect applied by the audio transformer 6A to the audio signal output from the second output unit 422. In this case, the DSP 4 can output from the second output unit 422 an audio signal at the same level as the audio signal input to the first input unit 411 and via the audio transformer 6A by adjusting the level of the audio signal output from the first output unit 421 while adjusting the level of the audio signal output from the second output unit 422.

[0025] The DSP 4 has an output switching function that outputs an audio signal from the second output unit 422 to a selected signal output unit from the multiple signal output systems 81 to 86. That is, the DSP 4 switches the output terminal to which the audio signal is input from the second output unit 42, among the multiple output terminals 812, 822, 832, 842, 852, and 861. For example, the DSP 4 outputs the audio signal to the first signal output system 81 as an audio signal that has passed through the audio transformer 6A, and outputs the audio signal to the second signal output system 82 as an audio signal that has not passed through the audio transformer 6A. Specifically, when the audio signal to be output to the first signal output system 81 is an audio signal to which a timbre effect has been added, the DSP 4 outputs the audio signal input from the first input unit 411 from the first output unit 421 and passes it through the audio transformer 6A, and outputs the audio signal output from the audio transformer 6A and input to the second input unit 412 from the second output unit 422. On the other hand, when the audio signal to be output to the second signal output system 82 is an audio signal to which no timbre effect has been added, the DSP 4 outputs the audio signal input from the first input unit 411 from the second output unit 422. This makes it possible to set for each signal output unit whether or not a timbre effect is applied by passing through the audio transformer 6A.

[0026] [Effects of First Embodiment] The audio device AD1 according to the present embodiment described above has the following effects. The audio device AD1 includes an audio signal processing device 1A. The audio signal processing device 1A includes a DSP 4 as a processor and an audio transformer 6A. The DSP 4 has a first input unit 411, a second input unit 412, a first output unit 421, and a second output unit 422. The DSP 4 processes the input audio signal. The audio transformer 6A is provided on a path electrically connecting the first output unit 421 and the second input unit 412. The DSP 4 outputs the audio signal input to the first input unit 411 from the first output unit 421 to the audio transformer 6A, and outputs the audio signal input from the audio transformer 6A to the second input unit 412 from the second output unit 422. In detail, the DSP 4 outputs the audio signal input to the first input unit 411 from the first output unit 421 to the audio transformer 6A via the D / A conversion unit 5A, and outputs the audio signal input to the second input unit 412 from the audio transformer 6A via the A / D conversion unit 7 to the output system 8 from the second output unit 422.

[0027] With this configuration, there is no need to provide an audio transformer 6A for each of the multiple signal output systems 81 to 86 that make up the output system 8 to which an audio signal is output from the second output unit 422. This makes it possible to reduce the number of audio transformers 6A employed in the audio signal processing device 1A compared to when an audio transformer 6A is provided for each of the multiple signal output systems 81 to 86. This allows the configuration of the audio signal processing device 1A to be simplified, thereby reducing the manufacturing cost of the audio signal processing device 1A and enabling the audio signal processing device 1A to be made more compact.

[0028] In the audio signal processing device 1A, the audio transformer 6A includes a left transformer 61L and a right transformer 61R. A left audio signal included in the audio signal input to the first input unit 411 is input from the DSP 4 to the left transformer 61L. A right audio signal included in the audio signal input to the first input unit 411 is input from the DSP 4 to the right transformer 61R. With this configuration, it is not necessary to provide a left transformer 61L to which the left audio signal is input and a right transformer 61R to which the right audio signal is input for each of the multiple signal output systems 81 to 86. This allows for a reduction in the number of transformers used in the audio signal processing device 1A compared to a case in which each of the multiple signal output systems 81 to 86 is provided with a left transformer 61L and a right transformer 61R. This allows for a simplification of the configuration of the audio signal processing device 1A, thereby reducing the manufacturing cost of the audio signal processing device 1A and enabling the audio signal processing device 1A to be made smaller. Furthermore, by providing the left transformer 61L and the right transformer 61R, it is possible to impart a transformer effect to the left audio signal and the right audio signal separately, thereby improving the versatility of the audio signal processing device 1A.

[0029] In the audio signal processing device 1A, the DSP 4 can output an audio signal input to the first input unit 411 from the second output unit 422 without passing through the audio transformer 6A. This configuration makes it possible to switch between applying an effect via the audio transformer 6A to the audio signal and not applying the effect to the audio signal. This improves the versatility of the audio signal processing device 1A.

[0030] In the audio signal processing device 1A, the DSP 4 has a function of adjusting the proportion of audio signals input to the first input unit 411 that are output from the first output unit 421 and the proportion of audio signals that are output from the second output unit 422 without passing through the audio transformer 6A. With this configuration, it is possible to adjust the proportion of the effect of passing through the audio transformer 6A in the audio signals output from the second output unit 422. This further enhances the versatility of the audio signal processing device 1A.

[0031] In the audio signal processing device 1A, the DSP 4 has a function of adjusting the level of the audio signal output from the first output unit 421 and the level of the audio signal output from the second output unit 422. With this configuration, for example, by increasing the level of the audio signal input to the first input unit 411 and output from the first output unit 421, and decreasing the level of the audio signal input to the second input unit 412 via the audio transformer 6A and output from the second output unit 422, it is possible to adjust the degree of effect achieved by passing through the audio transformer 6A without changing the overall level of the audio signal. This therefore enhances the versatility of the audio signal processing device 1A.

[0032] The audio signal processing device 1A includes a plurality of signal output systems 81-86 connected to a second output unit 422, which output an audio signal from the second output unit 422 to an external device. The DSP 4 outputs an audio signal from the second output unit 422 to a signal output system selected from the plurality of signal output systems 81-86. With this configuration, it is possible to set, for each signal output system, whether or not to apply the effect of passing through the audio transformer 6A. For example, of the plurality of signal output systems 81-86, the audio signal output to the first signal output system 81 can be an audio signal that has passed through the audio transformer 6A, while the audio signal output to the second signal output system 82 can be an audio signal that has not passed through the audio transformer 6A. This improves the versatility of the audio signal processing device 1A.

[0033] In the audio signal processing device 1A, the DSP 4 performs at least one of level adjustment, mixing processing, and effect addition on an audio signal input to at least one of the first input unit 411 and the second input unit 412. With this configuration, the DSP 4 can perform level adjustment, mixing processing, and effect addition on an audio signal output from the second output unit 422. This can enhance the versatility of the audio signal processing device 1A.

[0034] In the audio signal processing device 1A, the audio transformer 6A adds components that become overtones of the sound based on the input audio signal to the audio signal. With this configuration, the audio transformer 6A can impart a timbre effect to the audio signal.

[0035] The audio signal processing device 1A includes a plurality of input terminals 21, 23 connected to a first input unit 411. The DSP 4 switches between the input terminals 21, 23 that outputs an audio signal to the first input unit 411. The analog input terminal 21 can be configured with a plurality of input terminals, and the digital input terminal 23 can be configured with a plurality of input terminals. With this configuration, there is no need to provide a separate circuit that switches the input terminal that outputs an audio signal to the first input unit 411. This makes it possible to simplify the configuration of the audio signal processing device 1A.

[0036] The audio signal processing device 1A includes a plurality of output terminals 812, 822, 832, 842, 852, and 861 connected to the second output unit 422. The DSP 4 switches between the output terminals 812, 822, 832, 842, 852, and 861 to which the audio signal is input from the second output unit 422. With this configuration, there is no need to provide a separate circuit that switches between the output terminals 812, 822, 832, 842, 852, and 861 to which the audio signal is input from the second output unit 422. This makes it possible to simplify the configuration of the audio signal processing device 1A.

[0037] [Variation of First Embodiment] In the above-described audio signal processing device 1A, the DSP 4 selects whether to add harmonic components to the audio signal by selecting the output destination of the audio signal input to the first input unit 411 from the first output unit 421 or the second output unit 422. That is, when harmonic components are to be added to the audio signal input to the first input unit 411, the DSP 4 outputs the input audio signal from the first output unit 421, and when harmonic components are not to be added to the audio signal input to the first input unit 411, the DSP 4 outputs the input audio signal from the second output unit 422. In contrast, the DSP 4 may separate, from the audio signal input to the first input unit 411, a target signal to which harmonic components are to be added and a non-target signal other than the target signal, and add harmonic components only to the target signal. In this case, the DSP 4 outputs the target signal from the first output unit 421, synthesizes the target signal to which harmonic components have been added by the audio transformer 6A and input from the second input unit 412, and the non-target signal to which no harmonic components have been added, and outputs the result from the second output unit 422. In this way, the audio signal processing device 1A can output, for example, an audio signal to which harmonic components have been added only in a specific band from the output system 8.

[0038] [Second Embodiment] Next, a second embodiment of the present invention will be described. The acoustic device according to this embodiment has a configuration similar to that of the acoustic device AD1 according to the first embodiment, but the configuration of the audio transformer provided in the signal processing system is different. In the following description, parts that are the same or substantially the same as parts already described will be assigned the same reference numerals and description thereof will be omitted.

[0039] [Configuration of Acoustic Device and Audio Signal Processing Device] Fig. 2 is a block diagram showing the configuration of an acoustic device AD2 according to this embodiment. As shown in Fig. 2, the acoustic device AD2 according to this embodiment has the same configuration and functions as the acoustic device AD1 according to the first embodiment, except that it has an audio signal processing device 1B instead of the audio signal processing device 1A. The audio signal processing device 1B has the same configuration as the audio signal processing device 1A according to the first embodiment, except that it has a signal processing system 3B instead of the signal processing system 3A. That is, the audio signal processing device 1B has an input system 2, a signal processing system 3B, and an output system 8.

[0040] [Configuration of Signal Processing System] Like the signal processing system 3A according to the first embodiment, the signal processing system 3B processes an audio signal input from the input system 2 and outputs the audio signal to a signal output unit selected from the signal output systems 81 to 86 of the output system 8. The signal processing system 3A includes a DSP 4, a D / A conversion unit 5B, an audio transformer 6B, and an A / D conversion unit 7. The DSP 4 functions in the same way as the DSP 4 according to the first embodiment and the modified first embodiment.

[0041] [Configuration of D / A Conversion Unit] Similar to the D / A conversion unit 5A according to the first embodiment, the D / A conversion unit 5B converts the digital audio signal input from the DSP 4 into an analog audio signal and outputs it to the audio transformer 6B. The D / A conversion unit 5B has six D / A converters 51LH, 51LM, 51LL, 51RH, 51RM, and 51RL.

[0042] The D / A converters 51LH, 51LM, and 51LL constitute a left D / A conversion unit 51LB that converts a digital left audio signal included in an audio signal input from the first output unit 421 of the DSP 4 into an analog left audio signal. The D / A converter 51LH converts, into analog form, left high-frequency components, which are signal components in the high-frequency band included in the left audio signal. The high-frequency band is, for example, a frequency band of 4649 Hz or higher. The D / A converter 51LM converts, into analog form, left medium-frequency components, which are signal components in the medium-frequency band included in the left audio signal. The medium-frequency band is a frequency band lower than the high-frequency band, for example, a frequency band greater than 284 Hz and less than 4649 Hz. The D / A converter 51LL converts, into analog form, left low-frequency components, which are signal components in the low-frequency band included in the left audio signal. The low-frequency band is a frequency band lower than the medium-frequency band, for example, a frequency band of 284 Hz or lower. The signal components of each frequency band converted into analog signals by the D / A converters 51LH, 51LM, and 51LL are input to a left transformer 61LB of the audio transformer 6B.

[0043] The D / A converters 51RH, 51RM, and 51RL constitute a right D / A conversion unit 51RB that converts a digital right audio signal included in an audio signal input from the first output unit 421 of the DSP 4 into an analog right audio signal. The D / A converter 51RH converts, into analog form, right high-frequency components, which are signal components in the high frequency band included in the right audio signal. The D / A converter 51RM converts, into analog form, right medium-frequency components, which are signal components in the medium frequency band included in the right audio signal. The D / A converter 51RL converts, into analog form, right low-frequency components, which are signal components in the low frequency band included in the right audio signal. The signal components in each frequency band converted into analog signals by the D / A converters 51RH, 51RM, and 51RL are input to a right transformer 61RB of the audio transformer 6B.

[0044] [Configuration of Audio Transformer] The audio transformer 6B is an electronic component that, like the audio transformer 6A according to the first embodiment, adds harmonic components, which are harmonics of the sound based on the audio signal input from the D / A conversion unit 5B, to the audio signal to add a tone effect. The audio transformer 6A has six transformers 61LH, 61LM, 61LL, 61RH, 61RM, and 61RL that add the harmonic components.

[0045] The transformers 61LH, 61LM, and 61LL constitute a left transformer 61LB that adds harmonic components to the left audio signal input from the left D / A conversion unit 51LB. The high-frequency transformer 61LH receives a left high-frequency component contained in the audio signal input to the first input unit 411 via the D / A converter 51LH. The high-frequency transformer 61LH adds harmonic components that are harmonics of high-frequency audio corresponding to the left high-frequency component to the input left high-frequency component. The mid-frequency transformer 61LM receives a left mid-frequency component contained in the audio signal input to the first input unit 411 via the D / A converter 51LM. The mid-frequency transformer 61LM adds harmonic components that are harmonics of mid-frequency audio corresponding to the left mid-frequency component to the input left mid-frequency component. The low-frequency transformer 61LL receives the left low-frequency component contained in the audio signal input to the first input unit 411 via the D / A converter 51LL. The low-frequency transformer 61LL adds, to the input left low-frequency component, harmonic components that become harmonics of the low-frequency audio corresponding to the left low-frequency component.

[0046] The transformers 61RH, 61RM, and 61RL constitute a right transformer 61RB that adds harmonic components to the right audio signal input from the right D / A converter 51RB. The high-frequency transformer 61RH receives a right high-frequency component contained in the audio signal input to the first input unit 411 via the D / A converter 51RH. The high-frequency transformer 61RH adds harmonic components that are harmonics of high-frequency audio corresponding to the right high-frequency component to the input right high-frequency component. The mid-frequency transformer 61RM receives a right medium-frequency component contained in the audio signal input to the first input unit 411 via the D / A converter 51RM. The mid-frequency transformer 61RM adds harmonic components that are harmonics of medium-frequency audio corresponding to the right medium-frequency component to the input right medium-frequency component. The low-frequency transformer 61RL receives the right low-frequency component contained in the audio signal input to the first input unit 411 via the D / A converter 51RL. The low-frequency transformer 61RL adds harmonic components to the input right low-frequency component, which are harmonics of the low-frequency audio corresponding to the right low-frequency component. The signal components to which the harmonic components have been added by the transformers 61LH, 61LM, 61LL, 61RH, 61RM, and 61RL are input to the A / D converter 71 of the A / D conversion unit 7 and converted into digital signals, which are then input to the second input unit 412 of the DSP 4.

[0047] [Effects of Second Embodiment] The acoustic device AD2 according to the present embodiment described above exhibits the same effects as the acoustic device AD1 according to the first embodiment, as well as the following effects. In the audio signal processing device 1B, the audio transformer 6B includes a left transformer 61LB to which the left audio signal, of the audio signals input to the first input unit 411, is input via the D / A conversion unit 5B, and a right transformer 61RB to which the right audio signal is input via the D / A conversion unit 5B. The left transformer 61LB includes a high-frequency transformer 61LH, a mid-frequency transformer 61LM, and a low-frequency transformer 61LL. High-frequency band signal components of the left audio signal are input to the high-frequency transformer 61LH. Mid-frequency band signal components of the left audio signal are input to the mid-frequency transformer 61LM. Low-frequency band signal components of the left audio signal are input to the low-frequency transformer 61LL. The right transformer 61RB has a high-frequency transformer 61RH, a medium-frequency transformer 61RM, and a low-frequency transformer 61RL. The high-frequency transformer 61RH receives signal components in the high-frequency band of the right audio signal. The medium-frequency transformer 61RM receives signal components in the medium-frequency band of the right audio signal. The low-frequency transformer 61RL receives signal components in the low-frequency band of the right audio signal.

[0048] With this configuration, it is not necessary to provide the above-mentioned high-frequency transformers 61LH, 61RH, medium-frequency transformers 61LM, 61RM, and low-frequency transformers 61LL, 61RL in each of the multiple signal output systems 81 to 86. This makes it possible to reduce the number of transformers used in the audio signal processing device 1B compared to when the high-frequency transformers 61LH, 61RH, medium-frequency transformers 61LM, 61RM, and low-frequency transformers 61LL, 61RL are provided in each of the multiple signal output systems 81 to 86. This allows the configuration of the audio signal processing device 1B to be simplified, thereby reducing the manufacturing cost of the audio signal processing device 1B and enabling the audio signal processing device 1B to be made smaller. Furthermore, by providing the high-frequency transformers 61LH, 61RH, the mid-frequency transformers 61LM, 61RM, and the low-frequency transformers 61LL, 61RL, it is possible to impart transformer effects to the high-frequency, mid-frequency, and low-frequency signal components separately, thereby adjusting the levels of the harmonic components added to the signal components in each of the low-, mid-, and high-frequency bands. Furthermore, it is possible to select the band to which the harmonic effect is to be applied from the low-, mid-, and high-frequency bands. This enhances the versatility of the audio signal processing device 1B.

[0049] Here, if a single transformer is used to add harmonic components to high-frequency, mid-frequency, and low-frequency signal components, it is necessary to use an expensive transformer with a wide allowable frequency range. In contrast, by including high-frequency transformers 61LH and 61RH, mid-frequency transformers 61LM and 61RM, and low-frequency transformers 61LL and 61RL in the audio signal processing device 1B, relatively inexpensive transformers appropriate for each frequency band can be used in the audio signal processing device 1B. This reduces the manufacturing cost of the audio signal processing device 1B.

[0050] [Third Embodiment] Next, a third embodiment of the present invention will be described. The acoustic device according to this embodiment has a configuration similar to that of the acoustic device AD1 according to the first embodiment, but differs in the configuration of the signal processing system that constitutes the audio signal processing device. Specifically, in the acoustic device according to this embodiment, the signal processing system is constituted by a processor that executes an audio signal processing program. In the following description, parts that are the same or approximately the same as parts already described will be assigned the same reference numerals and description thereof will be omitted.

[0051] [Configuration of Acoustic Device and Audio Signal Processing Device] Fig. 3 is a block diagram showing the configuration of an acoustic device AD3 according to this embodiment. As shown in Fig. 3, the acoustic device AD3 according to this embodiment has the same configuration and functions as the acoustic device AD1 according to the first embodiment, except that it has an audio signal processing device 1C instead of the audio signal processing device 1A. The audio signal processing device 1C has the same configuration as the audio signal processing device 1A according to the first embodiment, except that it has a signal processing system 3C instead of the signal processing system 3A. That is, the audio signal processing device 1C has an input system 2, a signal processing system 3C, and an output system 8.

[0052] [Configuration of Signal Processing System] Similar to the signal processing systems 3A and 3B according to the first and second embodiments, the signal processing system 3C processes an audio signal input from the input system 2 and outputs the audio signal to a signal output unit selected from the signal output systems 81 to 86 of the output system 8. The signal processing system 3C includes a memory 31 and a processor 32. The memory 31 is a non-volatile memory such as a flash memory. The memory 31 stores an audio signal processing program to be executed by the processor 32. In other words, the memory 31 is a recording medium on which the audio signal processing program is recorded in a computer-readable manner.

[0053] [Configuration and Functions of the Processor] FIG. 4 is a functional block diagram showing the functions of the processor 32. An audio signal is input to the processor 32 from the input system 2. The processor 32 processes the input audio signal and outputs the processed audio signal to the output system 8. The processor 32 realizes the functions of the DSP 4 according to the second embodiment and the functions of the audio transformer 6B according to the second embodiment. Specifically, the processor 32 reads and executes an audio signal processing program stored in the memory 31, thereby functioning as an input source selection means 321, an output destination selection means 322, an effect addition means 323, a signal separation means 324, a harmonic component addition means 325, a level adjustment means 326, and a signal output means 327, as shown in FIG. 4 . Hereinafter, the audio signal input to the processor 32 from the input system 2 will be referred to as an input audio signal.

[0054] [Configuration of Input Source Selecting Means, Output Destination Selecting Means, and Effect Adding Means] The input source selecting means 321 switches the input terminal from among the multiple input terminals 21 and 23 that outputs an audio signal to the processor 32. As described above, the analog input terminal 21 can be configured from multiple input terminals, and the digital input terminal 23 can be configured from multiple input terminals. The output destination selecting means 322 selects, as the output destination signal output system, a signal output system selected by the user from among the signal output systems 81 to 86 of the output system 8. Specifically, the output destination selecting means 322 selects, from among the multiple output terminals 812, 822, 832, 842, 852, and 861, an output terminal to which the audio signal is input from the processor 32. The effect adding means 323 adds an effect selected by the user to the input audio signal, similar to the DSP 4.

[0055] [Configuration of Signal Separation Means] The signal separation means 324 separates, from the input audio signal, a target signal to which harmonics are to be added and non-target signals other than the target signal. More specifically, the signal separation means 324 separates the target signal and the non-target signal from the audio signal that is input to the processor 32 and to which an effect has been added by the effect addition means 323 as necessary. Note that when audio signals of a first piece of music and audio signals of a second piece of music are input to the processor 32 from the input system 2, the signal separation means 324 separates the target signal and the non-target signal from at least one of the audio signals of the first piece of music and the audio signal of the second piece of music.

[0056] For example, the signal separating means 324 separates at least one of the left audio signal and the right audio signal included in the input audio signal as a target signal from the input audio signal. At this time, if the left audio signal is separated from the input audio signal as a target signal, the right audio signal is a non-target signal. On the other hand, if both the left audio signal and the right audio signal are separated as target signals, there is no non-target signal.

[0057] For example, the signal separating means 324 separates signal components of a predetermined frequency band contained in the input audio signal as target signals from the input audio signal. Specifically, the signal separating means 324 separates signal components of at least one frequency band selected from low-frequency band signal components, mid-frequency band signal components, and high-frequency band signal components contained in the input audio signal as target signals from the input audio signal. In this case, if the input audio signal includes a left audio signal and a right audio signal, the signal separating means 324 may separate signal components of at least one frequency band selected from low-frequency band signal components, mid-frequency band signal components, and high-frequency band signal components of each of the left audio signal and the right audio signal from the input audio signal as target signals. Furthermore, the signal separating means 324 may separate signal components of at least one frequency band selected from low-frequency band signal components, mid-frequency band signal components, and high-frequency band signal components contained in one of the left audio signal and the right audio signal from the input audio signal as target signals. The low-frequency band corresponds to a first frequency band, the mid-frequency band corresponds to a second frequency band higher than the first frequency band, and the high-frequency band corresponds to a third frequency band higher than the second frequency band. The frequency range of each frequency band is the same as above. Depending on the user's operation, the signal separation means 324 may not separate the target signal from the input audio signal. In this case, the processor 32 can output the audio signal to the output system 8 without adding harmonic components using the harmonic component addition means 325.

[0058] [Configuration of the Harmonic Component Adding Means] The harmonic component adding means 325 is a functional unit that adds harmonic components, which are harmonics of the audio corresponding to the target signal separated by the signal separating means 324, to the target signal to impart a timbre effect to the input audio signal. For example, if the target signals are the left audio signal and the right audio signal, the harmonic component adding means 325 adds the harmonic components individually to each of the left audio signal and the right audio signal separated as the target signal, similar to the audio transformer 6A according to the first embodiment. Furthermore, for example, if the target signals are signal components of a predetermined frequency band contained in the left audio signal and the right audio signal, the harmonic component adding means 325 adds harmonic components, which are harmonics of the audio corresponding to the signal components, to the signal components of the predetermined frequency band separated as the target signal. At this time, when each of the low-frequency band signal components, the mid-frequency band signal components, and the high-frequency band signal components included in the left audio signal are target signals, the harmonic component adding means 325 adds the above-mentioned harmonic components individually to each of the low-frequency band signal components, the mid-frequency band signal components, and the high-frequency band signal components included in the left audio signal, similar to the audio transformer 6B according to the second embodiment. Also, when each of the low-frequency band signal components, the mid-frequency band signal components, and the high-frequency band signal components included in the left audio signal are target signals, the harmonic component adding means 325 adds the above-mentioned harmonic components individually to each of the low-frequency band signal components, the mid-frequency band signal components, and the high-frequency band signal components included in the right audio signal, similar to the audio transformer 6B.

[0059] [Configuration of the Level Adjustment Means] The level adjustment means 326 can adjust the signal level of the non-target signal, as well as the signal level of the target signal to which harmonic components have been added by the harmonic component addition means 325. That is, like the DSP 4, the level adjustment means 326 can adjust the signal level of the target signal before harmonic components are added by the harmonic component addition means 325, as well as the signal level of the target signal after harmonic components have been added by the harmonic component addition means 325. Therefore, the processor 32 can maintain the signal level of the entire audio signal constant, for example, before and after the addition of harmonic components. For example, the level adjustment means 326 can individually adjust the signal level of each of the multiple signal components included in the target signal. Therefore, if the target signal includes low-frequency band signal components, mid-frequency band signal components, and high-frequency band signal components, the level adjustment means 326 can individually adjust the level of the signal components in each frequency band before and after the addition of harmonic components.

[0060] [Configuration of the Signal Output Means] The signal output means 327 outputs the processed audio signal to the signal output system selected by the output destination selection means 322. In this case, the signal output means 327 can output only the target signal to which harmonic components have been added, or can output an audio signal that combines the target signal to which harmonic components have been added and a non-target signal. Furthermore, when audio signals for a first piece of music and a second piece of music are input to the processor 32 from the input system 2, the signal output means 327 can mix and output the audio signals of each piece of music in response to user operations, similar to the DSP 4 described above. In this case, the signal output means 327 functions as a mixing unit. In this way, the signal processing system 3C, which has the processor 32 that executes an audio signal processing program, can function in the same way as the signal processing systems 3A and 3B described above.

[0061] [Audio Signal Processing] Figure 5 is a flowchart showing the audio signal processing performed by the processor 32. The processor 32 performs the audio signal processing shown in Figure 5 by reading and executing an audio signal processing program from the memory 31. It is assumed that the selection and switching of the input terminal by the input source selection means 321 and the selection and switching of the output terminal by the output destination selection means 322 have already been performed. In the audio signal processing shown in Figure 5, the processor 32 first separates, using the signal separation means 324, a target signal selected by the user and non-target signals other than the target signal from the input audio signal (step S1). As described above, the target signal is an audio signal of the input audio signal to which harmonic components are added, and the non-target signal is an audio signal of the input audio signal other than the target signal.

[0062] Next, the processor 32 adds harmonic components to the target signal using the harmonic component adding means 325 (step S2). As described above, the harmonic component adding means 325 adds harmonic components, which are harmonics of the audio corresponding to the target signal, to the target signal. Note that the processor 32 can adjust the signal levels of the target signal and the non-target signals using the level adjusting means 326 at least either before or after the harmonic component adding means 325 adds the harmonic components. After step S2, the processor 32 outputs a synthesized audio signal, which is a synthesis of the target signal to which the harmonic components have been added and the non-target signal, using the signal output means 327 (step S3). At this time, the processor 32 outputs the synthesized audio signal to the signal output system selected by the output destination selecting means 322 using the signal output means 327. This completes the audio signal processing.

[0063] [Effects of the Third Embodiment] The acoustic device AD3 according to this embodiment described above achieves the same effects as the acoustic devices AD1 and AD2 according to the first and second embodiments. That is, in an audio signal processing device 1C including a processor 32 that processes and outputs an input audio signal, the processor 32 includes a signal separation means 324, a harmonic component addition means 325, and a signal output means 327. The signal separation means 324 separates, from the audio signal input to the processor 32, a target signal to which harmonics are to be added and non-target signals other than the target signal. The harmonic component addition means 325 adds harmonic components, which are harmonics of the audio corresponding to the separated target signal, to the target signal. The signal output means 327 outputs the target signal to which the harmonic components have been added.

[0064] With this configuration, it is possible to output a target signal in which harmonic components have been added to at least some of the audio signals input to the processor 32, without providing an audio transformer. This makes it possible to reduce the number of audio transformers used in the audio signal processing device 1C compared to when an audio transformer is provided for each of the multiple signal output systems 81 to 86 connected to the processor 32. This simplifies the configuration of the audio signal processing device 1C, thereby reducing the manufacturing cost of the audio signal processing device 1C and enabling the audio signal processing device 1C to be made smaller.

[0065] Furthermore, the audio signal processing program stored in memory 31 causes processor 32, to which an audio signal is input, to function as signal separation means 324, harmonic component addition means 325, and signal output means 327. Signal separation means 324 separates, from the input audio signal, a target signal to which harmonics are to be added and non-target signals other than the target signal. Harmonic component addition means 325 adds harmonic components, which become harmonics of the audio corresponding to the target signal, to the target signal. Signal output means 327 outputs the target signal to which the harmonic components have been added.

[0066] This configuration can achieve the same effects as the audio signal processing devices 1A and 1B according to the first and second embodiments described above, without providing an audio transformer. Therefore, the configuration of the audio signal processing device 1C in which the processor 32 is provided can be simplified, which not only reduces the manufacturing cost of the audio signal processing device 1C but also makes it possible to reduce the size of the audio signal processing device 1C.

[0067] [Modifications of the Embodiments] The present invention is not limited to the above-described embodiments, and modifications and improvements within the scope of achieving the object of the present invention are included in the present invention. In the first embodiment, the D / A conversion unit 5A includes a D / A converter 51L that converts a left audio signal to analog and a D / A converter 51R that converts a right audio signal to analog. The audio transformer 6A also includes a left transformer 61L to which the left audio signal is input and a right transformer 61R to which the right audio signal is input. However, this is not limited to this, and the D / A conversion unit 5A may use a single D / A converter to convert an audio signal input to the first input unit 411 of the DSP 4 into analog. The audio transformer 6A may also use a single transformer to add harmonic components that become harmonics of the audio corresponding to the analog audio signal input from the D / A conversion unit 5A.

[0068] Similarly, the D / A conversion unit 5B according to the second embodiment may use three D / A converters to convert into analog form the high-, mid-, and low-frequency components contained in the audio signal input to the first input unit 411 of the DSP 4. The audio transformer 6B may use three transformers to add harmonic components to the analog high-, mid-, and low-frequency components input from the D / A conversion unit 5A. The number of D / A converters included in the D / A conversion unit 5B and the number of transformers included in the audio transformer 6B may be changed as appropriate, and the range of each frequency band may also be changed as appropriate.

[0069] In the first and second embodiments, the DSP 4 is capable of outputting an audio signal input to the first input unit 411 from the second output unit 422 without passing through the audio transformers 6A and 6B. However, this is not limiting, and the DSP 4 may be configured to output only an audio signal to which harmonic components have been added via the audio transformers 6A and 6B from the second output unit 422. The same applies to the processor 32 according to the third embodiment.

[0070] In the first and second embodiments, the DSP 4 has a function of adjusting the ratio of audio signals output from the first output unit 421 to the audio transformers 6A and 6B and the ratio of audio signals output from the second output unit 422 without passing through the audio transformers 6A and 6B. However, this is not limiting, and the DSP 4 does not necessarily have to have this function.

[0071] In the first and second embodiments, the DSP 4 has a function of adjusting the level of the audio signal output from the first output unit 421 and the level of the audio signal output from the second output unit 422. However, this is not a limitation, and the DSP 4 does not have to have this function. In the third embodiment, the processor 32 has the level adjustment means 326. However, this is not a limitation, and the level adjustment means 326 may not be provided.

[0072] In the above embodiments, the output system 8 includes six signal output systems 81 to 86. However, this is not a limitation, and the number of signal output systems included in the output system 8 can be changed as appropriate. That is, the number of output terminals included in the output system 8 can be changed as appropriate. Furthermore, each of the signal output systems 81 to 85 includes a pair of a D / A converter and an output terminal, and the sixth signal output system 86 includes a USB output terminal 861. However, this is not a limitation, and the configuration of the signal output system can be changed as appropriate depending on the format of the output signal, etc. Furthermore, the input system 2 includes an analog input terminal 21 and a digital input terminal 23. However, this is not a limitation, and one of the analog input terminal 21 and the digital input terminal 23 may be omitted. Furthermore, the number of terminals included in each of the analog input terminal 21 and the digital input terminal 23 can be changed as appropriate.

[0073] In the first and second embodiments, the DSP 4 is described as being capable of performing level adjustment, mixing, and effect application on each of the audio signals input to the first input unit 411 and the second input unit 412. However, this is not a limitation, and the DSP 4 may be capable of performing level adjustment and other processing on only the audio signals input to one of the first input unit 411 and the second input unit 412. Furthermore, the DSP 4 is described as being capable of performing level adjustment, mixing, and effect application on the audio signals. However, this is not a limitation, and the DSP 4 may be capable of performing at least one of level adjustment, mixing, and effect application, and may have other functions instead of level adjustment, mixing, and effect application. Furthermore, the DSP 4 is described as switching input terminals and output terminals. However, this is not a limitation, and the DSP 4 may not perform at least one of input terminal switching and output terminal switching. The same applies to the processor 32 according to the third embodiment. For example, at least one of the input source selection unit 321, the output destination selection unit 322, and the effect addition unit 323 may be omitted.

[0074] In the third embodiment, the processor 32 processes an audio signal input to the processor 32. However, the present invention is not limited to this. The processor 32 may process an audio signal obtained by playing back an audio file recorded in the memory 31 as an input audio signal, and add harmonic components as described above.

[0075] In the third embodiment, the audio signal processing program is recorded in the memory 31. However, the present invention is not limited to this. The audio signal processing program may be recorded on a recording medium such as a disk-type recording medium, and read from the recording medium when the above-described audio signal processing is executed. The audio signal processing program may also be provided via a network such as the Internet.

[0076] In the above-described embodiments, examples have been shown in which the audio signal processing devices 1A, 1B, and 1C are applied to audio devices AD1, AD2, and AD3, which are DJ devices. However, the present invention is not limited to this, and the audio signal processing devices 1A, 1B, and 1C may also be applied to electronic devices other than audio devices, such as music playback devices.

[0077] [Summary of the Invention] The summary of the invention is as follows: [1] An audio signal processing device comprising: a processor having a first input unit, a second input unit, a first output unit, and a second output unit; and an audio transformer provided on a path electrically connecting the first output unit and the second input unit, wherein the processor outputs an audio signal input to the first input unit from the first output unit to the audio transformer, and outputs the audio signal input from the audio transformer to the second input unit from the second output unit.

[0078] With this configuration, the audio signal output from the second output unit can be pre-applied with the audio transformer effect. Therefore, even if multiple signal output systems are provided in the output system to which the audio signal is output from the second output unit, there is no need to provide an audio transformer for each of the multiple signal output systems. This allows the number of audio transformers used in the audio signal processing device to be reduced compared to when an audio transformer is provided for each of the multiple signal output systems. Therefore, the configuration of the audio signal processing device can be simplified, which not only reduces the manufacturing cost of the audio signal processing device but also allows the audio signal processing device to be made smaller.

[0079] [2] The audio signal processing device according to [1], wherein the audio transformer includes: a left transformer to which a left audio signal included in the audio signal input to the first input unit is input; and a right transformer to which a right audio signal included in the audio signal input to the first input unit is input. With this configuration, it is not necessary to provide a left transformer to which a left audio signal is input and a right transformer to which a right audio signal is input for each of the multiple signal output systems. This reduces the number of transformers used in the audio signal processing device compared to when a left transformer and a right transformer are provided for each of the multiple signal output systems. This simplifies the configuration of the audio signal processing device, thereby reducing the manufacturing cost of the audio signal processing device and enabling the audio signal processing device to be made smaller. Furthermore, providing a left transformer and a right transformer allows the left audio signal and the right audio signal to be individually subjected to the effects of passing through the transformer. This improves the versatility of the audio signal processing device.

[0080] [3] The audio signal processing device according to [1] or [2], wherein the audio transformer includes: a high-frequency transformer that receives high-frequency band signal components contained in the audio signal input to the first input unit; a medium-frequency transformer that receives medium-frequency band signal components contained in the audio signal input to the first input unit; and a low-frequency transformer that receives low-frequency band signal components contained in the audio signal input to the first input unit. This configuration eliminates the need to provide a high-frequency transformer, a medium-frequency transformer, and a low-frequency transformer for each of the multiple signal output systems. This reduces the number of transformers used in the audio signal processing device compared to when a high-frequency transformer, a medium-frequency transformer, and a low-frequency transformer are provided for each of the multiple signal output systems. This simplifies the configuration of the audio signal processing device, thereby reducing the manufacturing cost of the audio signal processing device and enabling the audio signal processing device to be made smaller. Furthermore, by providing a high-frequency transformer, a mid-frequency transformer, and a low-frequency transformer, the transformer effect can be applied to high-frequency band signal components, mid-frequency band signal components, and low-frequency band signal components separately, thereby increasing the versatility of the audio signal processing device.

[0081] [4] The audio signal processing device according to any one of [1] to [3], wherein the processor is capable of outputting the audio signal input to the first input unit from the second output unit without passing through the audio transformer. This configuration allows switching between applying an audio transformer effect to the audio signal and not applying the effect to the audio signal. This improves the versatility of the audio signal processing device.

[0082] [5] The audio signal processing device according to [4], wherein the processor adjusts the proportion of the audio signal input to the first input unit that is output from the first output unit and the proportion of the audio signal that is output from the second output unit without passing through the audio transformer. This configuration makes it possible to adjust the proportion of the audio signal output from the second output unit that is affected by passing through the audio transformer. This further enhances the versatility of the audio signal processing device.

[0083] [6] The audio signal processing device according to [4] or [5], wherein the processor adjusts the level of the audio signal output from the first output unit and the level of the audio signal output from the second output unit. With this configuration, for example, by raising the level of the audio signal input to the first input unit and output from the first output unit, and lowering the level of the audio signal input to the second input unit via an audio transformer and output from the second output unit, it is possible to adjust the degree of effect achieved by passing through the audio transformer without changing the overall audio signal level. This improves the versatility of the audio signal processing device.

[0084] [7] The audio signal processing device according to any one of [4] to [6], further comprising: a plurality of signal output systems connected to the second output unit, each of which outputs the audio signal output from the second output unit to an external device; and the processor outputs the audio signal from the second output unit to a signal output system selected from the plurality of signal output systems. With this configuration, it is possible to set whether or not to apply the effect of passing through an audio transformer for each signal output system. For example, among the plurality of signal output systems, the audio signal output to the first signal output system can be an audio signal that has passed through an audio transformer, while the audio signal output to the second signal output system can be an audio signal that has not passed through an audio transformer. This improves the versatility of the audio signal processing device.

[0085] [8] The audio signal processing device according to any one of [1] to [7], wherein the processor performs at least one of level adjustment, mixing, and effect addition on the audio signal input to at least one of the first input unit and the second input unit. With this configuration, the processor can perform at least one of level adjustment, mixing, and effect addition on the audio signal output from the second output unit. This can enhance the versatility of the audio signal processing device.

[0086] [9] The audio signal processing device according to any one of [1] to [8], wherein the audio transformer adds, to the input audio signal, components that become harmonics of the audio based on the audio signal. With this configuration, the audio transformer can impart a timbre effect to the audio signal.

[0087]

[10] The audio signal processing device according to any one of [1] to [9], further comprising a plurality of input terminals connected to the first input unit, and the processor switches the input terminal from among the plurality of input terminals to output the audio signal to the first input unit. With this configuration, there is no need to provide a separate circuit for switching the input terminal from which the audio signal is output to the first input unit. This simplifies the configuration of the audio signal processing device.

[0088]

[11] The audio signal processing device according to any one of [1] to

[10] , further comprising a plurality of output terminals connected to the second output unit, and the processor switches among the plurality of output terminals an output terminal to which the audio signal is input from the second output unit. With this configuration, there is no need to provide a separate circuit for switching the output terminal to which the audio signal is input from the second output unit. Therefore, the configuration of the audio signal processing device can be simplified.

[0089]

[12] An audio signal processing device including a processor to which an audio signal is input, the processor comprising: a signal separation means for separating, from the input audio signal, a target signal to which harmonics are to be added and a non-target signal other than the target signal; a harmonic component addition means for adding, to the target signal, harmonic components that are harmonics of the audio corresponding to the target signal; and a signal output means for outputting the target signal to which the harmonic components have been added. This configuration makes it possible to output a target signal in which harmonic components have been added to at least some of the input audio signals without using an audio transformer. This allows for a reduction in the number of audio transformers used in the audio signal processing device compared to a case in which an audio transformer is provided for each of multiple signal output systems connected to the processor. This simplifies the configuration of the audio signal processing device, thereby reducing manufacturing costs and enabling the audio signal processing device to be made more compact.

[0090]

[13] An acoustic device comprising the audio signal processing device according to any one of [1] to

[12] . With this configuration, it is possible to achieve the same effects as the audio signal processing device.

[0091]

[14] An audio signal processing program that causes a processor to which an audio signal is input to function as: a signal separation means that separates, from the input audio signal, a target signal to which harmonics are to be added and a non-target signal other than the target signal; a harmonic component addition means that adds harmonic components that are harmonics of the audio corresponding to the target signal to the target signal; and a signal output means that outputs the target signal to which the harmonic components have been added. This configuration can achieve the same effects as the audio signal processing device described above, without providing an audio transformer. Therefore, the configuration of an audio signal processing device that includes the processor can be simplified, thereby reducing the manufacturing cost of the audio signal processing device and enabling the audio signal processing device to be made smaller.

[0092]

[15] The audio signal processing program according to

[14] , wherein the signal output means synthesizes the target signal to which the harmonic components have been added and the non-target signal, and outputs the synthesized signal. With this configuration, an audio signal can be output in which harmonic components that are harmonics of the audio corresponding to the target signal have been added to the audio signal input to the processor. Therefore, the versatility of the audio signal processing device can be improved.

[0093]

[16] The audio signal processing program according to

[14] or

[15] , wherein the signal separation means separates at least one of a left audio signal and a right audio signal contained in the input audio signal as the target signal. With this configuration, harmonic components can be added to at least one of the left audio signal and the right audio signal contained in the input audio signal. Therefore, the versatility of the audio signal processing device can be improved.

[0094]

[17] The audio signal processing program according to any one of

[14] to

[16] , wherein the signal separation means separates, as the target signal, a signal component in a predetermined frequency band contained in the input audio signal. With this configuration, an audio signal can be output in which harmonic components corresponding to the signal component in the predetermined frequency band of the audio signal are added to the audio signal input to the processor. Therefore, the versatility of the audio signal processing device can be improved.

[0095]

[18] The audio signal processing program according to

[17] , wherein the signal separation means separates, as the target signal, a signal component of at least one frequency band selected from a signal component of a first frequency band included in the input audio signal, a signal component of a second frequency band higher than the first frequency band, and a signal component of a third frequency band higher than the second frequency band. With this configuration, an audio signal can be output in which harmonic components corresponding to at least one of the signal components of the first frequency band, the signal component of the second frequency band, and the signal component of the third frequency band are added to the audio signal input to the processor. This improves the versatility of the audio signal processing device.

[0096]

[19] The audio signal processing program according to any one of

[14] to

[18] , characterized in that the processor functions as a level adjustment means for adjusting the signal levels of each of a plurality of signal components contained in the target signal separated by the signal separation means. With this configuration, it is possible to adjust the degree of the timbre effect achieved by adding harmonic components. Therefore, the versatility of the audio signal processing device can be improved.

[0097] DESCRIPTION OF THE REFERENCE NUMERALS 1A, 1B, 1C...Audio signal processing device, 2...Input system, 3A, 3B, 3C...Signal processing system, 31...Memory, 32...Processor, 321...Input source selecting means, 322...Output destination selecting means, 323...Effect adding means, 324...Signal separating means, 325...Harmonic component adding means, 326...Level adjusting means, 327...Signal output means, 4...DSP (processor), 411...First input section, 412...Second input section, 421...First output section, 422...Second output section, 5A, 5B...D / A conversion section, 6A, 6B...Audio transformer, 61L, 61LB...Left transformer , 61LH...high frequency transformer, 61LL...low frequency transformer, 61LM...medium frequency transformer, 61R, 61RB...right transformer, 61RH...high frequency transformer, 61RL...low frequency transformer, 61RM...medium frequency transformer, 7...A / D conversion unit, 8...output system, 81...first signal output system (signal output system), 82...second signal output system (signal output system), 83...third signal output system (signal output system), 84...fourth signal output system (signal output system), 85...fifth signal output system (signal output system), 86...sixth signal output system (signal output system), AD1, AD2, AD3...acoustic device.

Claims

1. A voice signal processing apparatus comprising: a processor having a first input unit, a second input unit, a first output unit, and a second output unit; and an audio transformer provided on a path electrically connecting the first output unit and the second input unit, wherein the processor outputs a voice signal input to the first input unit from the first output unit to the audio transformer, and outputs the voice signal input to the second input unit from the audio transformer from the second output unit.

2. The voice signal processing apparatus according to claim 1, wherein the audio transformer includes: a left transformer into which a left voice signal included in the voice signal input to the first input unit is input; and a right transformer into which a right voice signal included in the voice signal input to the first input unit is input.

3. The voice signal processing apparatus according to claim 1 or 2, wherein the audio transformer includes: a high-frequency transformer into which a signal component in a high-frequency band included in the voice signal input to the first input unit is input; a medium-frequency transformer into which a signal component in a medium-frequency band included in the voice signal input to the first input unit is input; and a low-frequency transformer into which a signal component in a low-frequency band included in the voice signal input to the first input unit is input.

4. The voice signal processing apparatus according to any one of claims 1 to 3, wherein the processor is capable of outputting the voice signal input to the first input unit from the second output unit without passing through the audio transformer.

5. The voice signal processing apparatus according to claim 4, wherein the processor adjusts a ratio of the voice signal output from the first output unit to a ratio of the voice signal output from the second output unit without passing through the audio transformer among the voice signals input to the first input unit.

6. The voice signal processing apparatus according to claim 4 or 5, wherein the processor adjusts each of a level of the voice signal output from the first output unit and a level of the voice signal output from the second output unit.

7. The audio signal processing apparatus according to any one of claims 4 to 6, further comprising a plurality of signal output systems connected to the second output unit and outputting the audio signal output from the second output unit to the outside, wherein the processor outputs the audio signal from the second output unit to a signal output system selected from the plurality of signal output systems. An audio signal processing apparatus characterized by that.

8. The audio signal processing apparatus according to any one of claims 1 to 7, wherein the processor performs at least one of level adjustment, mixing processing, and effect addition on the audio signal input to at least one of the first input unit and the second input unit. An audio signal processing apparatus characterized by that.

9. The audio signal processing apparatus according to any one of claims 1 to 8, wherein the audio transformer adds a component that becomes a harmonic of the sound based on the input audio signal to the input audio signal. An audio signal processing apparatus characterized by that.

10. The audio signal processing apparatus according to any one of claims 1 to 9, further comprising a plurality of input terminals connected to the first input unit, wherein the processor switches an input terminal that outputs the audio signal to the first input unit among the plurality of input terminals. An audio signal processing apparatus characterized by that.

11. The audio signal processing apparatus according to any one of claims 1 to 10, further comprising a plurality of output terminals connected to the second output unit, wherein the processor switches an output terminal to which the audio signal is input from the second output unit among the plurality of output terminals. An audio signal processing apparatus characterized by that.

12. An audio signal processing apparatus comprising a processor to which an audio signal is input, wherein the processor includes signal separation means for separating, from the input audio signal, a target signal to which a harmonic is to be added and a non-target signal other than the target signal, and a harmonic component addition means for adding a harmonic component that becomes a harmonic of the sound corresponding to the target signal to the target signal, and signal output means for outputting the target signal to which the harmonic component is added. An audio signal processing apparatus characterized by that.

13. An acoustic apparatus comprising the audio signal processing apparatus according to any one of claims 1 to 12.

14. A voice signal processing program, which causes a processor that receives a voice signal to function as: signal separation means for separating, from the input voice signal, a target signal to which a harmonic component is to be added and an off-target signal other than the target signal; harmonic component addition means for adding, to the target signal, a harmonic component that is a harmonic of the voice corresponding to the target signal; and signal output means for outputting the target signal to which the harmonic component has been added.

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