JP2020021099A - Voice processing device and voice processing method - Google Patents

Abstract

To provide a voice processing device and a voice processing method that can effectively modify sound reproduced by digital sound data.SOLUTION: An acquisition unit 11 acquires digital sound data. A processing unit 12 subjects the digital sound data acquired by the acquisition unit 11 to sound volume increasing processing of increasing the sound volume as the value of the digital sound data becomes larger. An execution unit 13 executes at least one of reproduction and recording of the digital sound data subjected to the sound volume increasing processing performed by the processing unit 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an audio processing device and an audio processing method for performing audio processing on digital audio data.

  2. Description of the Related Art In recent years, digital audio reproducing apparatuses for reproducing digital audio recording media such as CDs (Compact Discs) and SACDs (Super Audio CDs) have become widespread. On the other hand, until the mid 1980's, an analog audio player (hereinafter also referred to as a "record player") for playing back a vinyl record such as an EP or LP made mainly of a material such as vinyl chloride with a needle-type player. .) Was the mainstream. It should be noted that the “voice” in the present specification includes a sound made only by a person's utterance, a sound made only by music, and a sound obtained by integrating a person's utterance and music.

  Digital audio reproducing devices are superior to analog audio reproducing devices in catalog characteristics such as wow and flutter and S / N ratio (Signal to Noise Ratio). Many users find that the reproduced sound is superior in sound quality. This is because a digital sound reproducing device has almost no noise or distortion in a general human audible frequency band, and thus has a different listening feeling from an analog sound reproducing device and is familiar with the sound reproduced by the analog sound reproducing device. This is because the user feels strange.

  Therefore, as a technique that can be applied to solve this problem, Patent Document 1 discloses a method of manufacturing a record disk having a silent groove, playing the record disk with a record player, generating a needle sound, and recording the needle sound. There is disclosed a music reproducing apparatus that mixes a digital audio performance sound.

  Further, Patent Document 2 discloses a noise generating means for generating a simulated noise simulating noise, and a mixing means for mixing the simulated noise generated by the noise generating means with an audio signal based on a digital signal recorded on a recording medium. A digital playback device having means is disclosed.

  Further, Japanese Patent Application Laid-Open No. H11-163873 discloses a sound that performs reproduction by adding an output having a spectrum in a high frequency range upper limit of a reproduction frequency band or a frequency band exceeding the high frequency range upper limit of an audible frequency band to an original audio signal in reproducing an audio signal. A signal reproduction method is disclosed. In this audio signal reproducing method, an output added to the original audio signal is a noise component similar to a random or random signal obtained from a signal source separate from the audio signal, and a predetermined frequency band is obtained from the noise component. Is added to the original audio signal for reproduction.

JP 2010-3382 A JP-A-9-62285 JP-A-9-36685

  However, the techniques disclosed in the above-mentioned Patent Documents 1 to 3 both superimpose the actually recorded needle sound and simulated noise on the audio signal, and do not necessarily reproduce the reproduced sound. There is a problem that the properties themselves cannot always be sufficiently improved. In the following, improving the property of the sound represented by the digital sound data is referred to as “reforming”.

  SUMMARY An advantage of some aspects of the invention is to provide an audio processing device and an audio processing method capable of effectively modifying a reproduced sound based on digital audio data.

  In order to achieve the above object, an audio processing device of the present invention includes an acquisition unit that acquires digital audio data, and a digital audio data acquired by the acquisition unit. And an execution unit that executes at least one of reproduction and recording of the digital audio data on which the volume increase processing has been performed by the processing unit.

  According to the audio processing device of the present invention, the acquisition unit acquires digital audio data. Note that acquisition of digital audio data by the acquisition unit includes acquisition by directly reading from a recording medium such as a CD, SACD, DVD (Digital Versatile Disc), BD (Blu-ray Disc) (registered trademark), and digital audio data. Is stored in a storage unit in the apparatus, and acquisition by reading from the storage unit is included. The acquisition of the digital audio data by the acquisition unit includes acquisition by wired communication or wireless communication from an external device, and acquisition by net distribution or the like via the Internet.

  Here, in the present invention, the processing section performs a sound volume increasing process on the digital audio data acquired by the acquiring section so as to increase the volume as the value of the digital audio data increases. Then, in the present invention, at least one of reproduction and recording of the digital audio data subjected to the volume increasing process by the processing unit is executed by the execution unit.

  That is, when an analog audio signal indicating the above-mentioned sound is generated by tracing the sound groove of a vinyl record disc on which sound is recorded in an analog manner with a record needle, the sound is generated by the record needle colliding with the inclined surface of the sound groove. The grooves are deformed and rebounded by the elasticity of the vinyl record, which temporarily increases the dynamic range of the analog audio signal.

  In the present invention, in order to artificially reflect the increase in the dynamic range on the digital audio data, a volume increase process is performed on the digital audio data such that the volume increases as the value of the digital audio data increases. . As a result, compared with the case where the volume increase processing is not performed, the reproduced sound by the digital audio data can be more effectively modified.

  As described above, according to the audio processing device of the present invention, the digital audio data is acquired, and the acquired digital audio data is subjected to a volume increasing process that increases the volume as the value of the digital audio data increases. Since at least one of the reproduction and recording of the digital audio data subjected to the volume increase processing is performed, the reproduced sound by the digital audio data is more effectively modified as compared with the case where the volume increase processing is not performed. Can be.

  In the present invention, the processing unit may perform, as the volume increasing process, a process of increasing the volume as the maximum value of a series of digital audio data having the immediately preceding reverse polarity in chronological order increases. Thereby, when the digital audio data is temporarily stored and the volume increase processing is performed on the digital audio data, the volume increase processing is performed in real time while suppressing an increase in the storage capacity for storing the digital audio data. It can be carried out.

  By the way, in general, the amplitude of the sound waveform increases as the frequency decreases, and therefore, if the processing of simply increasing the volume as the value of the digital audio data increases is performed on the digital audio data by volume increase processing, the frequency will decrease. Indeed, the increase in volume is relatively large.

  Therefore, according to the present invention, it is preferable that the processing unit performs the sound volume increasing process such that the lower the frequency of the digital audio data, the smaller the amount of increase in the volume. In particular, according to the present invention, the processing unit divides the frequency band of the digital audio data into a plurality of regions, and for each of the divided regions, the amount of increase in the sound volume is lower as the frequency is lower among the divided regions. It is preferable to perform the sound volume increasing process so that the number of sounds decreases. This makes it possible to improve the reproduction sound of the digital audio data with higher accuracy.

  Further, according to the present invention, prior to performing the volume increasing process, the processing unit performs, on the digital audio data acquired by the acquiring unit, a process of reducing the volume of the digital audio data by a predetermined value. You may. As a result, it is possible to prevent the occurrence of saturation of digital audio data which may occur with an increase in the volume due to the volume increase process.

  Further, according to the present invention, the processing unit further performs a process for the digital audio data to delay a phase of a band lower than a predetermined frequency band of the digital audio data from a phase of a higher frequency band than the band. Is also good. As a result, it is possible to improve the reproduced sound by the digital audio data more effectively.

  Further, according to the present invention, the processing unit further extracts, from the digital audio data, first audio data up to one octave below the predetermined crossover frequency, and extracts the first audio data from the extracted first audio data. A pseudo overtone generation process is performed to increase the frequency of the data by a factor of more than twice, and a reduction process is performed to reduce the amplitude of the second audio data obtained by this by a predetermined amount, and the third audio data obtained by this May be added to a band higher than the crossover frequency of the digital audio data. As a result, it is possible to improve the reproduced sound by the digital audio data more effectively.

  Further, according to the present invention, the processing unit further reproduces the audio recorded on the vinyl record board by using a cartridge provided with a record needle for a high frequency band higher than a predetermined frequency of the digital audio data. In such a case, a process of artificially adding the component of the resonance frequency between the cartridge and the vinyl record disc may be performed. As a result, it is possible to improve the reproduced sound by the digital audio data more effectively.

  Further, in the present invention, the processing unit may further perform a process of adding a Hiss Noise component generated on the magnetic tape to the digital audio data. As a result, it is possible to improve the reproduced sound by the digital audio data more effectively.

  In the present invention, the processing unit may further perform a process of adding a subsonic component to the digital audio data. As a result, it is possible to improve the reproduced sound by the digital audio data more effectively.

  According to the present invention, the digital audio data is information indicating stereo audio, and the processing unit further adds a crosstalk component to each digital audio data of the left and right channels in the digital audio data. May be performed. As a result, it is possible to improve the reproduced sound by the digital audio data more effectively.

  Further, in the present invention, the processing unit may further perform a process of emphasizing a high frequency component higher than a predetermined frequency or a process of attenuating the high frequency component on the digital audio data. As a result, it is possible to improve the reproduced sound by the digital audio data more effectively.

  In particular, the present invention further includes a receiving unit that receives a selection instruction indicating which of the processing of the emphasis and the attenuation is to be applied, wherein the processing unit performs the emphasis and the processing according to the selection instruction received by the receiving unit. Any of the above-described processes of attenuation may be selectively performed. As a result, any desired processing of the emphasis and the attenuation can be performed.

  On the other hand, in order to achieve the above object, a sound processing method of the present invention obtains digital sound data, and performs a sound volume increasing process for increasing the sound volume of the obtained digital sound data as the value of the digital sound data increases. And performing at least one of reproduction and recording of the digital audio data on which the volume increase processing has been performed.

  Therefore, according to the audio processing method of the present invention, the operation is performed in the same manner as the audio processing apparatus of the present invention. The sound reproduced by the audio data can be modified.

  ADVANTAGE OF THE INVENTION According to the audio processing apparatus and the audio processing method of this invention, the effect that the reproduction | regeneration sound by digital audio data can be improved effectively is acquired.

FIG. 2 is a functional block diagram of the audio processing device according to the embodiment. FIG. 1 is a block diagram illustrating an example of a schematic configuration of an audio reproducing / recording device according to an embodiment. FIG. 4 is a block diagram illustrating an example of an execution flow of the digital signal processor according to the embodiment. FIG. 4 is a diagram provided for describing a dynamic range conversion unit according to the embodiment, and is a cross-sectional view illustrating an example of a shape of a sound groove in a vinyl record. FIG. 5 is a diagram provided for describing a dynamic range conversion unit according to the embodiment, and is a plan view illustrating an example of a state of a sound groove and a state of tracing by a record needle in a vinyl record disc. FIG. 7 is an example of a waveform diagram for explaining a sound volume increasing process according to the embodiment. FIG. 3 is a block diagram illustrating an example of a configuration of a dynamic range conversion unit according to the embodiment. FIG. 4 is a diagram provided for describing a phase conversion unit according to the embodiment, and is a graph illustrating an example of mechanical impedance characteristics of a cartridge. FIG. 3 is a block diagram illustrating an example of a configuration of a phase conversion unit according to the embodiment. FIG. 6 is a diagram provided for describing a phase conversion unit according to the embodiment, and is a graph illustrating an example of frequency domain data of digital audio data divided by a frequency division unit. FIG. 4 is a diagram provided for description of a high frequency band conversion unit according to the embodiment, and is a graph showing an example of frequency domain data of digital audio data. FIG. 6 is a diagram provided for describing a high frequency band conversion unit according to the embodiment, and is a graph illustrating an example of a state in which pseudo-overtone audio data is integrated with digital audio data. FIG. 3 is a block diagram illustrating an example of a configuration of a high frequency band conversion unit according to the embodiment. FIG. 7 is a diagram provided for describing a resonance frequency signal adding unit according to the embodiment, and is a graph illustrating an example of a triangular wave. FIG. 6 is a diagram provided for describing a resonance frequency signal adding unit according to the embodiment, and is a graph illustrating an example of a sawtooth wave. FIG. 8 is a diagram provided for describing a resonance frequency signal adding unit according to the embodiment, and is a graph illustrating another example of a sawtooth wave. It is a block diagram showing an example of composition of a resonance frequency signal addition part concerning an embodiment. It is a block diagram showing an example of composition of a hiss noise addition part concerning an embodiment. FIG. 3 is a block diagram illustrating an example of a configuration of a subsonic band adding unit according to the embodiment. It is a block diagram showing an example of composition of a cross talk addition part concerning an embodiment. FIG. 3 is a block diagram illustrating an example of a configuration of a treble region volume increase / decrease processing unit according to the embodiment. 5 is a flowchart illustrating an example of a sound reproduction / recording process according to the embodiment. It is a schematic diagram showing an example of an initial setting screen concerning an embodiment. It is a schematic diagram showing an example of a change state of an initial setting screen concerning an embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 shows an audio processing device 10 according to the present embodiment. As shown in FIG. 1, the audio processing device 10 according to the present embodiment includes an acquisition unit 11, a processing unit 12, and an execution unit 13.

  The acquisition unit 11 acquires digital audio data. In the audio processing device 10 according to the present embodiment, the digital audio data is acquired from the recording medium 60 mounted in the device, but is not limited to this. For example, digital audio data may be obtained from an external device by wired communication or wireless communication.

  Further, the processing unit 12 performs various audio processes on the digital audio data acquired by the acquisition unit 11, including a volume increasing process for increasing the volume as the value of the digital audio data increases. Then, the execution unit 13 executes at least one (in this embodiment, both) of reproduction and recording of the digital audio data on which the various audio processes have been performed by the processing unit 12.

  Note that the acquisition unit 11 in the audio processing device 10 is an example of an acquisition unit according to the present invention, the processing unit 12 is an example of a processing unit according to the present invention, and the execution unit 13 is an example of an execution unit according to the present invention. is there. In the following, as an example, the present invention will be described in which digital audio data recorded on a CD is subjected to various types of audio processing and then reproduced in real time, and the digital audio data is stored in a built-in storage unit. A case where the present invention is applied to a processing device will be described.

  The above-described audio processing device 10 can be realized by the audio reproducing / recording device 20 shown in FIG.

  As shown in FIG. 2, the audio reproducing / recording device 20 according to the present embodiment includes a CPU (Central Processing Unit) 21, a memory 22, a storage unit 23, an input unit 24, a display unit 25, an optical drive 26, and a communication unit 27. And a DSP (Digital Signal Processor) 28. The CPU 21, the memory 22, the storage unit 23, the input unit 24, the display unit 25, the optical drive 26, the communication unit 27, and the DSP 28 are connected to each other via a bus 29.

  The optical drive 26 reads digital audio data written on a recording medium 60 configured as a CD.

  On the other hand, the DSP 28 mainly performs a predetermined audio process on digital audio data written on the recording medium 60 set in the optical drive 26. The DSP 28 is connected with a D / A (Digital to Analog) converter 80, a filter 81, an amplifier 82, and a speaker 83 in this order, and the digital audio data subjected to the audio processing by the DSP 28 is converted into a D / A converter. The sound is reproduced by the speaker 83 via the filter 80, the filter 81 and the amplifier 82.

  Further, the storage unit 23 can be realized by an HDD (Hard Disk Drive), a flash memory, or the like. The storage unit 23 stores a sound reproduction / recording program 23A for causing the sound reproduction / recording device 20 to function as the sound processing device 10. In the audio reproduction / recording device 20 according to the present embodiment, the audio reproduction / recording program 23A is installed in the storage unit 23 in advance. Then, the CPU 21 reads out the audio reproduction / recording program 23A from the storage unit 23, expands it in the memory 22, and sequentially executes the processes of the audio reproduction / recording program 23A.

  The audio reproduction / recording program 23A has an acquisition process 23A1, a processing process 23A2, and an execution process 23A3. The CPU 21 operates as the acquisition unit 11 illustrated in FIG. 1 by executing the acquisition process 23A1. The CPU 21 operates as the processing unit 12 illustrated in FIG. 1 by executing the processing process 23A2. Further, the CPU 21 operates as the execution unit 13 illustrated in FIG. 1 by executing the execution process 23A3.

  In the audio reproduction / recording device 20 according to the present embodiment, the DSP 28 normally executes the audio processing itself by the processing process 23A2 in real time.

  As described above, the audio reproduction / recording device 20 that has executed the audio reproduction / recording program 23A functions as the audio processing device 10.

  Next, the configuration of the DSP 28 according to the present embodiment will be described with reference to FIG. As shown in FIG. 3, the DSP 28 according to the present embodiment includes a shift-down processing unit 30, a dynamic range conversion unit 32, a phase conversion unit 34, a high frequency band conversion unit 36, a resonance frequency signal addition unit 38, and a hiss noise addition unit 40. , A subsonic band adding unit 42, a crosstalk adding unit 44, and a treble region volume increase / decrease processing unit 46.

  The shift-down processing unit 30 reduces the volume of the digital audio data acquired by the acquisition unit 11 by a predetermined value before performing the audio processing by the dynamic range conversion unit 32. Perform processing. Note that the shift-down processing unit 30 according to the present embodiment performs a process of shifting down digital audio data by a predetermined number of bits as a process of reducing the volume by the predetermined value.

  In the present embodiment, as will be described later, since it is assumed that the dynamic range converter 32 raises the volume of digital audio data at a maximum magnification of about 6 dB, the shift-down processing unit 30 according to the present embodiment is used. Then, for example, a 1-bit shift down is performed for the volume of the digital audio data.

  On the other hand, the dynamic range conversion unit 32 performs a volume increasing process on the input digital audio data such that the volume increases as the value of the digital audio data increases. In the dynamic range converter 32 according to the present embodiment, as a volume increasing process, the input digital audio data is traced with a record needle in the sound groove of a vinyl record disc on which audio is recorded in an analog manner. In the case where the analog sound signal indicating the sound is generated, an increase in the volume according to an increase in the dynamic range due to the deformation and rebound of the sound groove caused by the record needle colliding with the inclined surface of the sound groove is reflected. Perform processing.

  That is, as shown in FIG. 4 and FIG. 5, the sound groove 50 of the vinyl record board is V-shaped in cross section and meanders, and one inclined surface of the sound groove 50 is a surface representing the sound of the left channel. The other inclined surface is a surface representing the sound of the right channel.

  Here, when reproducing the sound recorded on the vinyl record disc, the tip of the record needle 52 relatively moves (traces) along the sound groove 50 while the vinyl record disc is rotated. . At this time, as an example, the tip of the record needle 52 relatively moves in the direction indicated by the arrow A in FIG. 5, and the tip collides with one of the inclined surfaces of the sound groove 50, so that The dynamic weight is applied, and the portion of the sound groove 50 where the tip of the record needle 52 collides is deformed. The rebound of the tip of the record needle 52 in accordance with the deformation of the sound groove 50 increases the acceleration of the record needle 52 in the direction indicated by the arrow B in FIG. Due to the increase in the acceleration, the dynamic range of the sound corresponding to the position where the tip of the record needle 52 collides is temporarily expanded.

  The amount of deformation of the sound groove 50 due to the dynamic load at this time depends on the weight of the tip of the cartridge provided with the record needle 52, the characteristics and shape of the tip of the record needle 52, the material of the vinyl record board, and the like. Generally, the ratio is about 10% of the depth a (see FIG. 4) of the inclined surface of the sound groove 50 from the surface of the vinyl record. In this case, the expansion amount of the dynamic range of the sound is at least about several dB as the expansion ratio of the volume.

  In contrast, digital sound recording media such as CDs and SACDs do not have a sound groove itself, so that the dynamic range does not increase due to deformation of the sound groove or rebound due to elasticity. Many users feel unsatisfactory.

  Therefore, the dynamic range conversion unit 32 according to the present embodiment reflects the increase in volume according to the expansion of the dynamic range at this time on the digital audio data.

  Here, since the sound groove 50 has a larger lateral change width with respect to the sound groove as the volume of the recorded sound is larger, the deformation amount of the sound groove 50 due to the collision of the tip of the record needle 52 becomes larger as the sound volume becomes larger. As the volume increases and the sound volume increases, the amount of expansion of the dynamic range increases. Therefore, in the dynamic range conversion unit 32 according to the present embodiment, the larger the value of the digital audio data, the larger the above-mentioned volume increase.

  In the dynamic range converter 32 according to the present embodiment, as shown in FIG. 6, as an example, the larger the peak value immediately before the digital audio data to be increased, the larger the volume increase. In the example shown in FIG. 6, the dynamic range conversion unit 32 first generates a series of digital signals having a negative polarity immediately after the volume increase p1 corresponding to the magnitude of the peak value P1 of the series of digital audio data having a positive polarity. The sound data is uniformly raised. Subsequently, the dynamic range conversion unit 32 generates a volume increase p2 corresponding to the magnitude of the peak value P2 of the series of digital audio data having the negative polarity, and then immediately increases the series of digital audio data having the positive polarity. And raise it uniformly. Thereafter, the dynamic range conversion unit 32 repeats the same processing until there is no more digital audio data to be processed.

  However, the volume increase process is not limited to this mode. For example, instead of using a peak value as a reference for the volume increase as the peak value immediately before the digital audio data to be volume-increased, the peak value May be used as the peak value immediately before. Also, for example, as the value of the digital audio data itself to be increased in volume increases, the amount of increase in volume applied to the digital audio data may be increased.

  As shown in FIG. 7, the dynamic range conversion unit 32 according to the present embodiment includes a left channel audio memory 32A and a right channel audio memory 32A, as shown in FIG. The memory 32B is provided. Further, the dynamic range conversion unit 32 according to the present embodiment includes a peak detection unit 32C and a zero-cross detection unit 32D that are shared by the left and right channel audios, respectively, and also includes a left channel audio data padding unit 32E and An audio data raising section 32F for audio of the right channel is provided.

  The memory 32A stores digital audio data L of the left channel, and the memory 32B stores digital audio data R of the right channel. The peak detection unit 32C detects a peak value (see also FIG. 6) from the digital audio data L and the digital audio data R. Further, the zero-cross detecting unit 32D detects, from the digital audio data L and the digital audio data R, a section where the density of the sound wave is eliminated, that is, a time point at which a zero cross occurs. Further, the audio data raising unit 32E adds to the digital audio data L a value corresponding to a volume increase corresponding to the peak value detected by the peak detection unit 32C from the digital audio data L. Similarly, the audio data raising unit 32F adds, to the digital audio data R, a value corresponding to a volume increase corresponding to the peak value detected by the peak detection unit 32C from the digital audio data R. .

  That is, in the dynamic range converter 32, the digital audio data L is temporarily stored in the memory 32A. Next, the digital audio data L is referred to in chronological order by the peak detection unit 32C and the zero-cross detection unit 32D, and after the peak value is detected by the peak detection unit 32C, the zero-cross is first detected by the zero-cross detection unit 32D. The digital audio data L from the point in time to the next point in time is specified. Then, the audio data raising unit 32E adds a value having a magnitude corresponding to the peak value detected by the peak detection unit 32C to the specified digital audio data L.

  Similarly, in the dynamic range converter 32, the digital audio data R is temporarily stored in the memory 32B. Next, the digital audio data R is referred to in chronological order by the peak detection unit 32C and the zero-cross detection unit 32D, and after the peak value is detected by the peak detection unit 32C, the zero-cross is first detected by the zero-cross detection unit 32D. The digital audio data R from the point of time to the next point of detection is specified. Then, the audio data raising unit 32F adds a value having a magnitude corresponding to the peak value detected by the peak detection unit 32C to the specified digital audio data R.

  The dynamic range conversion unit 32 according to the present embodiment repeatedly executes the above processing until there is no more digital audio data to be processed.

  In the dynamic range conversion unit 32 according to the present embodiment, the value to be added to the digital audio data of each channel corresponds to a predetermined ratio of the peak value serving as a reference of the value (in the present embodiment, as an example, 6 dB). However, the present invention is not limited to this.

  As described above, in the audio processing performed by the dynamic range conversion unit 32 according to the present embodiment, the value of the digital audio data after processing becomes larger than the value before processing. The shifted down processing unit 30 is also driven.

  By the way, as described above, in general, the amplitude of the sound waveform increases as the frequency decreases, and therefore, a process of simply increasing the volume as the value of the digital audio data increases by performing a volume increase process on the digital audio data is performed. Then, as the frequency becomes lower, the amount of increase in the volume becomes relatively larger.

  Therefore, the dynamic range conversion unit 32 may perform the sound volume increasing process such that the lower the frequency of the digital audio data, the smaller the amount of increase in the sound volume. In particular, the dynamic range conversion unit 32 may perform the sound volume increase processing such that the sound volume increase amount becomes relatively smaller as the frequency of the divided region becomes lower. In this case, the dynamic range conversion unit 32 divides the frequency band of the digital audio data into a plurality of regions, and for each of the divided regions, the amount of increase in volume relative to the divided region having a lower frequency between the divided regions is relatively large. The sound volume increasing process may be performed so as to reduce the volume.

  This makes it possible to improve the reproduction sound of the digital audio data with higher accuracy.

  On the other hand, the phase conversion unit 34 performs a process on the input digital audio data to delay the phase of a band of a predetermined frequency band or less of the digital audio data from the phase of a higher frequency band.

  That is, as described above, the sound groove of the vinyl record board is deformed by the trace caused by the tip of the record needle. Further, as shown in FIG. 8 as an example, a cartridge provided with a record needle has a mechanical impedance characteristic in which a low frequency region (low sound) has a higher value than a middle frequency region (medium sound). The mechanical impedance is a value indicating the difficulty of mechanical movement of the structure. The smaller the mechanical impedance, the easier the movement is, and the larger the mechanical impedance, the harder the movement.

  Therefore, the phase of a low tone in which the amplitude of the sound groove is large and the mechanical impedance in the cartridge is relatively large is delayed as compared with the middle tone. On the other hand, as described above, digital audio recording media such as CDs and SACDs do not have a sound groove itself, so that the phase of the bass sound is not delayed as compared with the middle sound as digital data. Also, many users feel unsatisfactory.

  Here, since human hearing has the highest sensitivity to sound of about 2 kHz to 5 kHz, it is preferable not to change the phase of this frequency band. Therefore, the phase conversion unit 34 according to the present embodiment performs a phase conversion to delay the phase of the input digital audio data in a frequency band of 2 kHz or less. However, the present invention is not limited to this frequency band, but may be configured to perform phase conversion for other frequency bands.

  In order to realize the function of performing the above-described phase conversion, the phase conversion unit 34 according to the present embodiment includes a left channel audio memory 34A and a right channel audio memory 34B as shown in FIG. I have. Further, the phase conversion unit 34 according to the present embodiment includes a frequency division unit 34C, a fast Fourier transform (FFT) unit 34D, a phase angle change unit 34E, and an IFFT ( An Inverse FFT (Inverse Fast Fourier Transform) unit 34F and an LPF (Low-Pass Filter) 34G are provided. Furthermore, the phase conversion unit 34 according to the present embodiment includes an audio data integration unit 34H for left channel audio and an audio data integration unit 34I for right channel audio.

  The memory 34A stores digital audio data L of the left channel, and the memory 34B stores digital audio data R of the right channel. The frequency division unit 34C divides the digital audio data L and the digital audio data R at a predetermined frequency (here, 2 kHz). The frequency division unit 34C stores the data on the high frequency side of the divided digital audio data L in the memory 34A, and stores the data on the high frequency side of the divided digital audio data R in the memory 34B. Then, the frequency division unit 34C outputs the data on the low frequency side of each of the divided digital audio data L and digital audio data R to the FFT unit 34D.

  Further, the FFT unit 34D performs a fast Fourier transform on each of the low-frequency side data of the digital audio data L and the digital audio data R obtained by the frequency division unit 34C, thereby obtaining the low-frequency side of the left and right channels. , And generates data in the frequency domain corresponding to each voice. The phase angle changing unit 34E relatively delays the phase angle of the data in the low frequency region obtained by the FFT unit 34D by a predetermined phase angle from the data on the high frequency side. Further, the IFFT unit 34F returns the data in the low-frequency region whose phase angle has been delayed by the phase angle changing unit 34E to digital audio data.

  Further, the LPF 34G extracts only data having a frequency equal to or lower than the predetermined frequency from the digital audio data obtained by the IFFT unit 34F. Then, the audio data integration unit 34H integrates (synthesizes) the data on the high frequency side of the digital audio data L stored in the memory 32A and data obtained based on the digital audio data L by the LPF 34G. Thus, the digital audio data L subjected to the phase conversion is created. Similarly, the audio data integration unit 34I integrates (synthesizes) the data on the high frequency side of the digital audio data R stored in the memory 32B and data obtained based on the digital audio data R by the LPF 34G. Thus, the digital audio data R subjected to the phase conversion is created.

  That is, in the phase converter 34, the digital audio data L is stored in the memory 34A, and the digital audio data R is stored in the memory 34B. Further, in the phase converter 34, each of the digital audio data stored in the memories 34A and 34B is divided by the frequency divider 34C using the predetermined frequency (2 kHz in the present embodiment) as a boundary. The data on the high frequency side of the digital audio data L is stored in the memory 34A, and the data on the high frequency side of the digital audio data R is stored in the memory 34B.

  Next, in the phase conversion unit 34, the low-frequency side data corresponding to the left and right channel sounds obtained by the frequency division unit 34C is converted into frequency domain data by the FFT unit 34D. As a result, as shown in FIG. 10 as an example, data in a low frequency region corresponding to the audio of the left and right channels is obtained.

  Next, in the phase conversion unit 34, the phase angle changing unit 34E delays the phase angle of the data in the low frequency region corresponding to the audio of the left and right channels by a predetermined phase angle. For example, in the case of delaying data with a frequency of 100 Hz, one cycle of the data of the frequency is 10 ms (= 1 ÷ 100). Therefore, in order to delay the phase angle by 90 degrees as an example, 2.5 ms (= 10 ÷ 4) It will be delayed.

  In addition, in the phase angle changing unit 34E according to the present embodiment, 45 degrees is applied as the predetermined phase angle for simplification, but the present invention is not limited to this. For example, another phase angle such as 22.5 degrees, 67.5 degrees, and 90 degrees may be applied. Further, the phase angle may be changed depending on the frequency. Further, the phase angle to be applied here may be input to the user via the input unit 24 or the like, and the input phase angle may be applied.

  Next, in the phase converter 34, the IFFT unit 34F returns the data in the low frequency region corresponding to the audio of the left and right channels, the phase angle of which has been delayed by the phase angle changing unit 34E, to digital audio data, and the LPF 34G From the digital audio data corresponding to the audio of the left and right channels, only data of the predetermined frequency or lower is extracted.

  Then, in the phase conversion unit 34, the audio data integration unit 34H converts the data on the high frequency side of the digital audio data L stored in the memory 34A and the data obtained based on the digital audio data L by the LPF 34G. By integrating (synthesizing), digital audio data L after phase conversion is created and output. Similarly, in the phase conversion unit 34, the audio data integration unit 34I outputs the data on the high frequency side of the digital audio data R stored in the memory 34B and the data obtained based on the digital audio data R by the LPF 34G. Are integrated (synthesized) to generate and output digital audio data R after phase conversion.

  As described above, in the phase conversion unit 34 according to the present embodiment, the frequency domain is divided by the frequency division unit 34C at a stage preceding the FFT unit 34D. However, the present invention is not limited to this. For example, instead of the frequency division unit 34C, the frequency domain may be divided while the digital audio data is converted into the frequency domain data by the FFT unit 34D. Further, instead of the phase angle changing unit 34E, the phase angle may be changed at a subsequent stage of the IFFT unit 34F. Further, instead of the LPF 34G, a configuration may be adopted in which only data having a frequency equal to or lower than the predetermined frequency is extracted in a stage preceding the IFFT unit 34F.

  By the way, the sampling frequency employed in CD is 44.1 kHz, but it is difficult to perform faithful recording and reproduction in a frequency band of about 20 kHz with this sampling frequency. That is, a tone around 20 kHz generally has a very complicated waveform, and it is difficult to faithfully reproduce the tone only by sampling a few points on the waveform.

  Thus, as an example, as shown in FIG. 11, the high frequency band conversion unit 36 according to the present embodiment uses a predetermined crossover frequency (18 kHz in the example shown in FIG. 11) based on the input digital audio data. The first audio data up to an octave lower (9 kHz in the example shown in FIG. 11) is extracted. Further, the high frequency band conversion unit 36 performs a pseudo-overtone generation process on the extracted first audio data so that the frequency of the first audio data is slightly more than twice. Further, the high frequency band conversion unit 36 reduces the amplitude of the second audio data obtained as described above by a predetermined amount (in the present embodiment, half the amplitude of the second audio data). I do. Then, the high frequency band conversion unit 36 performs a process of adding the third audio data obtained by the above-described reduction processing to the crossover frequency band of the digital audio data, as shown in FIG. 12, for example.

  As shown in FIG. 13, the high frequency band conversion unit 36 according to the present embodiment includes a left channel audio memory 36A and a right channel audio memory 36A, as shown in FIG. The memory 36B is provided. Further, the high frequency band conversion unit 36 according to the present embodiment includes a frequency division unit 36C, an FFT unit 36D, a frequency extraction unit 36E, a pseudo overtone generation unit 36F, an IFFT unit 36G, An attenuator 36H and a band-pass filter (BPF) 36I are provided. Further, the high frequency band conversion unit 36 includes an audio data integration unit 36J for left channel audio and an audio data integration unit 36K for right channel audio.

  The memory 36A stores digital audio data L of the left channel, and the memory 36B stores digital audio data R of the right channel. The frequency division unit 36C divides the digital audio data L and the digital audio data R in a frequency band (here, 9 kHz) up to one octave below the crossover frequency. Then, the frequency division unit 36C outputs each of the divided digital audio data L and digital audio data R to the FFT unit 36D.

  Further, the FFT unit 36D performs a fast Fourier transform on each of the digital audio data L and the digital audio data R divided by the frequency dividing unit 36C, thereby obtaining a frequency domain corresponding to each audio of the left and right channels. Generate data. Further, the frequency extracting unit 36E extracts data of a frequency band up to one octave below the crossover frequency in the data of the frequency domain obtained by the FFT unit 36D. The pseudo overtone generation unit 36F performs the pseudo overtone generation process on the data extracted by the frequency extraction unit 36E. The IFFT unit 36G returns the data on which the pseudo harmonic generation processing has been performed by the pseudo harmonic generation unit 36F to digital audio data.

  The attenuator 36H performs the above-described reduction processing on the digital audio data obtained by the IFFT unit 36G. Further, the BPF 36I extracts only data in a frequency band up to slightly more than one octave above the crossover frequency from the digital audio data subjected to the reduction processing by the attenuator 36H.

  Then, the audio data integration unit 36J integrates (synthesizes) the data obtained based on the digital audio data L by the BPF 36I into a band equal to or higher than the crossover frequency of the digital audio data L stored in the memory 36A. As a result, digital audio data L that has undergone high-frequency band conversion is created. Similarly, the audio data integration unit 36K integrates (synthesizes) data obtained based on the digital audio data R by the BPF 36I in a band equal to or higher than the crossover frequency of the digital audio data R stored in the memory 36B. Thus, the digital audio data R converted in the high frequency band is created.

  That is, in the high frequency band conversion unit 36, the digital audio data L is stored in the memory 36A, and the digital audio data R is stored in the memory 36B. Further, in the high frequency band conversion unit 36, each of the digital audio data stored in the memories 36A and 36B is divided by the frequency division unit 36C using a frequency band one octave below the crossover frequency as a boundary.

  Next, in the high frequency band conversion unit 36, the data corresponding to the audio of the left and right channels divided by the frequency division unit 36C is converted into data in the frequency domain by the FFT unit 36D. Next, in the high frequency band conversion unit 36, the frequency extraction unit 36E extracts the data in the frequency domain corresponding to the left and right channel voices, and the pseudo overtone generation unit 36F supports the left and right channel voices respectively. The pseudo-overtone generation processing of slightly more than twice the calculated value is performed on the data in the frequency domain.

  Next, in the high-frequency band conversion unit 36, the IFFT unit 36G returns the data in the frequency domain corresponding to the left and right channel sounds subjected to the pseudo-overtone generation processing by the pseudo-overtone generation unit 36F to digital voice data, and the attenuator. 36H, the above-described reduction processing is performed on the digital audio data corresponding to the audio of the left and right channels, and the BPF 36I converts the digital audio data corresponding to the audio of the left and right channels into one octave of the crossover frequency. Only data in the frequency band up to the upper limit is extracted.

  In the high-frequency band conversion unit 36, the audio data integration unit 36J obtains the digital audio data L stored in the memory 36A in a band equal to or higher than the above-mentioned crossover frequency based on the digital audio data L by the BPF 36I. By integrating (synthesizing) the data, digital audio data L converted into a high frequency band is created and output. Similarly, in the high-frequency band conversion unit 36, the audio data integration unit 36K obtains the digital audio data R stored in the memory 36B in a band equal to or higher than the above crossover frequency based on the digital audio data R by the BPF 36I. By integrating (synthesizing) the converted data, digital audio data R converted into a high frequency band is created and output.

  As described above, in the high frequency band conversion unit 36 according to the present embodiment, the frequency domain is divided by the frequency division unit 36C at a stage preceding the FFT unit 36D. However, the present invention is not limited to this. For example, instead of the frequency division unit 36C, the frequency domain may be divided while the digital audio data is converted into the frequency domain data by the FFT unit 36D. Further, instead of the pseudo-overtone generation unit 36F, a pseudo-overtone generation process may be performed at a subsequent stage of the IFFT unit 36G. Instead of the BPF 36I, a configuration may be employed in which only data in a frequency band one octave lower than the crossover frequency is extracted at a stage preceding the IFFT unit 36G.

  By the way, in a cartridge which has a reputation for high sound quality, a resonance frequency between the cartridge and the vinyl record disk is often present in a high frequency band around 15 kHz to 20 kHz. Then, in resonance in the high frequency band at the resonance frequency, the record needle moves in a complicated manner, so that a very large number of distortion operations occur in the record needle.

  On the other hand, when data recorded on a digital audio recording medium such as a CD or SACD is reproduced, the cartridge does not use the cartridge. Therefore, the above resonance frequency does not exist, and some users may feel uncomfortable or unsatisfactory in this respect. Many.

  Therefore, the resonance frequency signal adding unit 38 according to the present embodiment converts the high frequency band (in the present embodiment, a fundamental frequency band of 15 kHz to 20 kHz) higher than a predetermined frequency of the input digital audio data, A process for artificially adding the component of the resonance frequency between the cartridge and the vinyl record disc is performed.

  In addition, in the resonance frequency signal adding unit 38 according to the present embodiment, as the above-described component of the resonance frequency, the component is applied in a pseudo manner, for example, as a triangular wave illustrated in FIG. 14, but is not limited thereto. For example, a mode in which the sawtooth wave shown in FIGS. 15 and 16 is quasi-applied as the component of the resonance frequency may be used. Alternatively, a configuration may be adopted in which a component based on the actual resonance frequency is acquired in advance and the component is applied.

  In order to realize the function of adding the above-described components of the resonance frequency, the resonance frequency signal adding unit 38 according to the present embodiment includes a triangular wave generator 38A, a volume determiner 38C, an attenuator 38D, There are provided two superimposing portions 38E and 38F.

  The triangular wave generator 38A generates a triangular wave shown in FIG. 14 as an example and outputs the triangular wave to the attenuator 38D by a conventionally known technique. The volume determiner 38C determines the volume of the audio based on the left-channel digital audio data L and the right-channel digital audio data R. The attenuator 38D attenuates and outputs the amplitude of the input triangular wave as the volume determined by the volume determiner 38C decreases. Further, the superimposing unit 38E superimposes the triangular wave output from the attenuator 38D on the digital audio data L, and outputs the digital audio data L. Similarly, the superimposing unit 38F superimposes the triangular wave output from the attenuator 38D on the digital audio data R and outputs the digital audio data R.

  That is, in the resonance frequency signal adding section 38, a triangular wave is generated by the triangular wave generator 38A. Further, in the resonance frequency signal adding unit 38, the sound volume judgment unit 38C judges the sound volume of the sound by the digital sound data of the left and right channels.

  Then, in the resonance frequency signal adding unit 38, the triangular wave generated by the triangular wave generator 38A is attenuated by the attenuator 38D as the volume determined by the volume determiner 38C decreases, and the digital audio data L is reduced by the superimposing unit 38E. The superimposed portion 38F superimposes and outputs the attenuated triangular wave on the digital audio data R by the superimposing section 38F.

  By the way, in the recording site of music and the like before the 1980's, a recording / reproducing apparatus using an open-reel magnetic tape is mainly used, and in a sound source using the recording / reproducing apparatus, hiss noise peculiar to the magnetic tape is generated. I was On the other hand, in the case of digital audio recording media such as CDs and SACDs, hiss noise does not occur when the original recording is also performed digitally, and many users feel uncomfortable or unsatisfactory in this regard.

  Therefore, the hiss noise adding unit 40 performs a process of adding a hiss noise component generated on the magnetic tape to the input digital audio data.

  In order to realize the function of adding the above-mentioned hiss noise component, the hiss noise adding section 40 according to the present embodiment includes a hiss generator 40A, a gate section 40B, a silence / voice existence discriminator 40C, as shown in FIG. And two overlapping portions 40D and 40E.

  The hiss generator 40A stores in advance digital audio data indicating hiss noise (hereinafter referred to as "his noise data") and outputs the hiss noise data. In this embodiment, hiss noise data is recorded in a silent state by a recording / reproducing apparatus using an actual open-reel magnetic tape, thereby digitally recording a reproduced sound of an analog signal recorded on the magnetic tape. Get by. At this time, the digital recording is performed, for example, at a sampling rate of 176.4 (= 44.1 × 4) kHz, and at a recording level using a MSB (Most Significant Bit) as a 24-bit configuration.

  The gate unit 40B switches between output and stop of the input hiss noise data by switching between the open state and the closed state according to the input control signal. The silence / speech discriminator 40C discriminates between a silence part and a speech part in the digital audio data L of the left channel and the digital audio data R of the right channel. The silence / speech discriminator 40C opens the gate section 40B to output hiss noise data when a speech section is detected, and sets the gate section 40B when a silence section is detected. Is output to the gate unit 40B so that the signal is closed and the hiss noise data is not output. Note that a configuration may be used in which it is possible to select in advance whether or not the target to which the hiss noise data is to be applied is only the sound portion using the silent / sound discriminator 40C.

  Further, the superimposing unit 40D superimposes hiss noise data output from the gate unit 40B on the digital audio data L and outputs the digital audio data L. Similarly, the superimposing unit 40E superimposes hiss noise data output from the gate unit 40B on the digital audio data R and outputs the data. In the present embodiment, the superimposition of the hiss noise data is performed in the vicinity of the LSB (Least Significant Bit) of each digital audio data of the left and right channels (specifically, in the case of 24-bit processing, including the LSB as an example). This is performed by adding up to the third bit up to the LSB from the LSB. In this case, the target frequency band is about 5 Hz to 50 kHz. This is because, as described above, in this embodiment, since hiss noise is sampled at 176.4 kHz, digital recording can be performed relatively accurately up to about 50 kHz.

  That is, in the hiss noise adding section 40, hiss generator 40A outputs hiss data. Further, in the hiss noise adding section 40, when a silent section in the digital audio data of the left and right channels is detected by the silence / speech discriminator 40C, the gate section 40B outputs hiss noise data to detect the silent section. If so, the output of the hiss noise data is stopped by the gate unit 40B.

  In the hiss noise adding section 40, the superposing section 40D superimposes the hiss noise data on the digital audio data L and outputs the same, while the superimposing section 40E superimposes the hiss noise data on the digital audio data R. Output.

  On the other hand, in general, in a record player, in addition to the eccentricity and warpage of the vinyl record, the resonance frequency in the low frequency band often appears around 10 Hz due to the relative relationship between the arm and the cartridge. Noise (subsonic) occurs. In contrast, digital audio recording media such as CDs and SACDs do not have such a resonance point, so that sounds around 10 Hz are usually recorded except for sounds of musical instruments such as large drums. Many users do not record, and in this regard, they feel different from a vinyl record and feel unsatisfactory.

  Therefore, the subsonic band adding unit 42 performs a process of adding a subsonic component to the input digital audio data.

  In order to realize the function of adding the above-described subsonic component, the subsonic band adding unit 42 according to the present embodiment includes a subsonic data generator 42A and two superimposing units 42B and 42C as shown in FIG. Have.

  The subsonic data generator 42A generates and outputs digital audio data (hereinafter, referred to as “subsonic data”) as a subsonic component. In the present embodiment, digital audio data imitating the frequency of a human α-wave is applied as the subsonic data. Note that the subsonic data applied here is not limited to the one imitating the frequency of the α wave, the one imitating the frequency of a human brain wave such as the β wave, or the first to third order of Schumann resonance similar to the brain wave. A form in which a frequency signal or the like is applied may be adopted.

  The superimposing unit 42B superimposes the subsonic data output from the subsonic data generator 42A on the digital audio data L, and outputs the digital audio data L. Similarly, the superimposing unit 42C superimposes the above-mentioned subsonic data on the digital audio data R and outputs it.

  That is, in the subsonic band adding section 42, the subsonic data is output by the subsonic data generator 42A. In the subsonic band adding unit 42, the supersonic unit 42B superimposes the subsonic data on the digital audio data L and outputs the supersonic data, while the superimposing unit 42C superimposes the subsonic data on the digital audio data R. And output.

  By the way, as described above, in the vinyl record, the left channel sound and the right channel sound are simultaneously recorded in one sound groove, and crosstalk occurs in combination with the cartridge mechanism. On the other hand, when reproducing data recorded on a digital audio recording medium such as a CD or SACD, crosstalk does not occur in the digital domain, and many users feel uncomfortable or unsatisfactory in this respect.

  Therefore, the crosstalk adding unit 44 performs a process of adding a crosstalk component to each digital audio data of the left and right channels in the input digital audio data.

  In order to realize the function of adding the above-described crosstalk component, the crosstalk adding unit 44 according to the present embodiment, as shown in FIG. 20, includes an LPF 44A, an attenuator 44B, and an HPF (High- A pass filter 44C and an attenuator 44D are provided. Further, the crosstalk adding unit 44 includes an LPF 44F, an attenuator 44G, an HPF 44H, and an attenuator 44I for audio of the right channel. Further, the crosstalk adding unit 44 includes two superimposing units 44E and 44J.

  The LPF 44A extracts, from the digital audio data L of the left channel, only data having a predetermined first frequency (100 Hz in this embodiment) or lower and outputs the data. In addition, the attenuator 44B reduces the data output from the LPF 44A to a predetermined first amount (in the present embodiment, the amount is equal to or less than the amount of crosstalk in a low frequency band normally generated in a record player) and output. I do.

  Further, the HPF 44C extracts only data having a predetermined second frequency (10 kHz in this embodiment) or higher from the digital audio data L and outputs the data. Further, the attenuator 44D reduces the data output from the HPF 44C to a predetermined second amount (in the present embodiment, the amount is equal to or less than the amount of crosstalk in a high frequency band normally generated in a record player) and output. I do.

  On the other hand, the LPF 44F extracts and outputs only the data of the first frequency or lower from the digital audio data R of the right channel. The attenuator 44G reduces the data output from the LPF 44F to the first amount and outputs the data.

  Also, the HPF 44H extracts and outputs only the data of the second frequency or higher from the digital audio data R. The attenuator 44I reduces the data output from the HPF 44H to the second amount and outputs the data.

  The superimposing unit 44E superimposes the data output from the attenuator 44G and the attenuator 44I on the digital audio data L and outputs the digital audio data L. The superimposing unit 44J superimposes the data output from the attenuator 44B and the data output from the attenuator 44D on the digital audio data R, and outputs the digital audio data R.

  In the crosstalk adding unit 44 according to the present embodiment, 100 Hz is used as the first frequency and 10 kHz is used as the second frequency. And each frequency band of 10 kHz or more is a region where more crosstalk occurs. (In fact, although the level is low, crosstalk occurs in all frequency bands when playing vinyl records.)

  That is, in the crosstalk adding unit 44, only the data of the first frequency or lower is extracted and output from the digital audio data L by the LPF 44A, and the data output from the LPF 44A is reduced to the first amount by the attenuator 44B. And output. In the crosstalk adding unit 44, only data of the second frequency or higher is extracted and output from the digital audio data L by the HPF 44C, and the data output from the HPF 44C is reduced to the second amount by the attenuator 44D. And output.

  On the other hand, the crosstalk adding unit 44 extracts and outputs only the data of the first frequency or less from the digital audio data R by the LPF 44F, and reduces the data output from the LPF 44F to the first amount by the attenuator 44G. And output. In the crosstalk adding unit 44, only data of the second frequency or higher is extracted and output from the digital audio data R by the HPF 44H, and the data output from the HPF 44H is reduced to the second amount by the attenuator 44I. And output.

  Then, in the crosstalk adding unit 44, the data output from the attenuator 44G and the attenuator 44I are superimposed on the digital audio data L and output by the superimposing unit 44E. In the crosstalk adding unit 44, the data output from the attenuator 44B and the attenuator 44D are superimposed on the digital audio data R by the superimposing unit 44J and output.

  By the way, in the record player, by adjusting the stylus pressure of the record needle, it is possible to emphasize a high frequency component (so-called “high rise”) or to suppress a high frequency component (so-called “high fall”). it can.

  Therefore, the treble region volume increase / decrease processing unit 46 performs a process of emphasizing a high frequency component higher than a predetermined frequency or a process of attenuating the high frequency component on the input digital audio data.

  In order to realize the function of performing the above-described process of emphasizing the high frequency component (hereinafter, referred to as “emphasizing process”) or the process of attenuating (hereinafter, referred to as “attenuating process”), the volume of the high-frequency region according to the present embodiment is realized. As shown in FIG. 21, the increase / decrease processing unit 46 includes an LPF 46A, an HPF 46B, a frequency equalizer 46C, and a superimposing unit 46D for audio of the left channel, and an LPF 46E, an HPF 46F, and a frequency equalizer 46G for audio of the right channel. And a superimposition section 46H.

  The LPF 46A extracts, from the digital audio data L of the left channel, only data lower than a predetermined third frequency (4 kHz in this embodiment) and outputs the same. Further, the HPF 46B extracts only the data of the third frequency or higher from the digital audio data L of the left channel and outputs the data. Further, the frequency equalizer 46C emphasizes the digital audio data output from the HPF 46B with a predetermined emphasis amount, or attenuates the digital audio data with a predetermined attenuation amount and outputs it. Then, the superimposition unit 46D integrates the digital audio data output from the LPF 46A with the digital audio data output from the frequency equalizer 46C and outputs the integrated digital audio data. In the present embodiment, as the predetermined enhancement amount and the predetermined attenuation amount, the enhancement amount in the enhancement process and the attenuation amount in the attenuation process that are close to the behavior of the cartridge are used, respectively. However, the present invention is not limited to this.

  On the other hand, the LPF 46E extracts and outputs only data having a frequency lower than the third frequency from the digital audio data R of the right channel. Also, the HPF 46F extracts and outputs only the data of the third frequency or higher from the digital audio data R of the right channel. Further, the frequency equalizer 46G emphasizes the digital audio data output from the HPF 46F with the above-mentioned predetermined emphasis amount, or attenuates the digital audio data with the above-mentioned predetermined attenuation amount and outputs the result. Then, the superimposing unit 46H superimposes the digital audio data output from the frequency equalizer 46G on the digital audio data output from the LPF 46E, and outputs the digital audio data.

  That is, in the treble region volume increase / decrease processing unit 46, only data having a frequency lower than the third frequency is extracted from the digital audio data L and output by the LPF 46A. In the treble region volume increase / decrease processing unit 46, only data of the third frequency or higher is extracted from the digital audio data L by the HPF 46B and output. Further, in the treble region volume increase / decrease processing unit 46, the digital audio data output from the HPF 46B is emphasized by the predetermined emphasis amount or attenuated by the predetermined attenuation amount by the frequency equalizer 46C. And output. Then, in the treble region volume increase / decrease processing unit 46, the superimposing unit 46D superimposes the digital audio data output from the LPF 46A on the digital audio data output from the frequency equalizer 46C and outputs the digital audio data.

  On the other hand, in the treble region volume increase / decrease processing unit 46, only data having a frequency lower than the third frequency is extracted from the digital audio data R and output by the LPF 46E. Further, the treble region volume increase / decrease processing unit 46 extracts and outputs only the data of the third frequency or higher from the digital audio data R by the HPF 46F. In the treble region volume increase / decrease processing section 46, the digital audio data output from the HPF 46F is emphasized by the frequency equalizer 46G by the predetermined emphasis amount or attenuated by the predetermined attenuation amount. And output. In the treble region volume increase / decrease processing unit 46, the superimposing unit 46H superimposes the digital audio data output from the frequency equalizer 46G on the digital audio data output from the LPF 46E, and outputs the digital audio data.

  In the DSP 28 according to the present embodiment, the drive / non-drive of each of the shift-down processing unit 30, the dynamic range conversion unit 32, the phase conversion unit 34, and the high frequency band conversion unit 36 is set by the CPU 21 in accordance with the designation by the user. Is done. In the DSP 28 according to the present embodiment, the resonance frequency signal addition unit 38, the hiss noise addition unit 40, the subsonic band addition unit 42, the crosstalk addition unit 44, and the high-frequency region volume increase / decrease process are performed by the CPU 21 in accordance with the designation by the user. The drive / non-drive of each of the sections 46 is set. In the DSP 28 according to the present embodiment, when the non-driving is set by the CPU 21 in each of the above-described units, the sound processing is not performed by itself, and the data input terminal and the data output terminal corresponding to the data input terminal are not executed. Short-circuit the terminals. In the following, the parts that perform various types of audio processing, such as the dynamic range conversion unit 32 and the phase conversion unit 34 in the DSP 28, are collectively referred to as “audio processing units”.

  Although not shown, the DSP 28 according to the present embodiment performs audio processing by an audio processing unit designated by the user based on digital audio data recorded on the recording medium 60 set in the optical drive 26. It has a sound reproduction function of reproducing sound in a state where the sound is reproduced. In addition, the DSP 28 according to the present embodiment has an audio recording function of recording the digital audio data in the storage unit 23 in a state where the audio processing has been performed by the audio processing unit designated by the user. . Hereinafter, the audio reproduction function and the audio recording function are collectively referred to as “audio reproduction / recording function”.

  Next, the operation of the audio reproducing / recording device 20 according to the present embodiment will be described. First, the user sets a desired recording medium 60 to the optical drive 26 for the audio reproducing / recording device 20. Then, the user causes the audio reproduction / recording device 20 to execute the audio reproduction / recording program 23A, whereby the audio reproduction / recording process shown in FIG. 22 is performed.

  In step 100 of the audio reproduction / recording process, the acquisition unit 11 controls the display unit 25 to display an initial setting screen for prompting the user to specify a desired audio process. The unit 11 waits for input of predetermined information.

  FIG. 23 shows an initial setting screen according to the present embodiment. As shown in FIG. 23, on the initial setting screen, a “Dynamic Range Conversion” button 25A that is designated when performing the audio processing by the dynamic range conversion unit 32 is displayed. Further, on the initial setting screen, a “phase conversion” button 25B specified when performing the audio processing by the phase conversion unit 34 and a “high frequency conversion” button specified when performing the audio processing by the high frequency band conversion unit 36 "Band conversion" button 25C is displayed. In addition, on the initial setting screen, a “resonance frequency signal addition” button 25D specified when performing the sound processing by the resonance frequency signal adding unit 38 and a “specified when performing the sound processing by the hiss noise adding unit 40” are specified. Hiss noise addition "button 25E is displayed. In addition, on the initial setting screen, a “subsonic band addition” button 25F, which is designated when performing the audio processing by the subsonic band adding unit 42, is displayed. Further, on the initial setting screen, a “crosstalk addition” button 25G specified when performing the audio processing by the crosstalk addition unit 44 and a voice processing performed by the treble region volume increase / decrease processing unit 46 are specified. A “treble region volume increase / decrease process” button 25H is displayed.

  When the initial setting screen shown in FIG. 23 is displayed on the display unit 25, the user designates one or a plurality of buttons indicating desired sound processing via the input unit 24, and then presses a "designation end" button 25I. specify. Here, when the user designates the “treble region volume increase / decrease process” button 25H, the acquisition unit 11 pulls down the “decay process” button 25H1 and the “emphasis process” button 25H2 as shown in FIG. 24 as an example. It is displayed on the display unit 25 as a menu. When the pull-down menu is displayed, the user designates the “attenuation process” button 25H1 to execute the attenuation process when the attenuation process is performed by the high-frequency region volume increase / decrease processing unit 46 via the input unit 24, and the emphasis process is executed. In this case, the "emphasis processing" button 25H2 is designated. Note that the user designates the “processing end” button 25J via the input unit 24 when ending the audio reproduction / recording processing.

  When the “designation end” button 25I or the “processing end” button 25J on the initial setting screen is designated by the user, the above-mentioned step 102 becomes an affirmative judgment and shifts to step 104.

  In step 104, the processing unit 12 determines whether or not the button specified by the user is the “processing end” button 25J. If the determination is negative, the processing unit 12 determines that the “designation end” button 25I has been specified by the user. Considering this, the process proceeds to step 106.

  In step 106, the processing unit 12 sets the DSP 28 so that the part corresponding to the button specified by the user is driven. For example, when the “dynamic range conversion” button 25A and the “phase conversion” button 25B are designated by the user, the processing unit 12 sends the DSP 28 a shift-down processing unit 30, a dynamic range conversion unit 32, and a phase conversion unit 34. Is set to drive. When all the buttons 25A to 25H are designated by the user, the processing unit 12 sets the DSP 28 so that all parts are driven. As described above, the DSP 28 does not execute the sound processing by itself for the parts other than the part set to be driven by the processing unit 12, and performs the signal input terminal and the signal output corresponding to the signal input terminal. Perform processing to short-circuit the terminals. As a result, in the DSP 28, preparation for driving only the part set to be driven by the processing unit 12 is completed.

  In the next step 108, the processing unit 12 determines whether or not the “treble region volume increase / decrease process” button 25H has been designated by the user. If a negative determination has been made, the process proceeds to step 116 described later, while an affirmative determination is made. If the answer is "YES", the process shifts to step 110 to determine whether or not the "decay process" button 25H1 is designated by the user. Here, if the determination is affirmative, the process proceeds to step 112, where the processing unit 12 sets the DSP 28 to execute the attenuation process by the treble region volume increase / decrease processing unit 46, and then proceeds to step 116. If a negative determination is made, the processing unit 12 considers that the “emphasis processing” button 25H2 has been designated by the user, and proceeds to step 114. After the setting is made to execute, the process proceeds to step 116.

  In step 116, the acquisition unit 11 reads digital audio data from the recording medium 60 set in the optical drive 26.

  In the next step 118, the execution unit 13 starts driving the audio processing unit set to be driven by the processing in step 106 while transmitting the digital audio data read by the acquisition unit 11 to the DSP 28. Control. In the next step 120, the execution unit 13 controls the DSP 28 so as to start execution of the above-described sound reproduction / recording function, and then returns to the above-mentioned step 102.

  On the other hand, if an affirmative determination is made in step 104, the processing unit 12 determines that the “processing end” button 25J has been designated by the user, shifts to step 122, executes a predetermined end process, The reproduction / recording process ends. In the audio reproduction / recording processing according to the present embodiment, various settings for the DSP 28 are canceled and the default state is set (in this embodiment, all audio processing units can be driven). The state in which the driving of the DSP 28 is stopped is applied after the state is changed to the state described above, but it goes without saying that the present invention is not limited to this.

  As described above in detail, in the present embodiment, the digital audio data is obtained by the obtaining unit (the obtaining unit 11 in the present embodiment). In the present embodiment, the processing unit (in the present embodiment, the processing unit 12) increases the volume of the digital audio data acquired by the acquisition unit as the value of the digital audio data increases. (In the present embodiment, audio processing by the dynamic range conversion unit 32) is performed. In the present embodiment, the execution unit (the execution unit 13 in the present embodiment) performs at least one of the reproduction and the recording (in the present embodiment, both) of the digital audio data on which the volume increase processing is performed by the processing unit. Execute. Therefore, according to the present embodiment, it is possible to more effectively reform the reproduction sound by the digital audio data as compared with the case where the volume increase processing is not performed.

  Further, in the present embodiment, as the volume increasing process, the processing unit performs the volume increasing as the maximum value (peak value in the present embodiment) of a series of digital audio data having the immediately preceding reverse polarity in chronological order increases. Is being processed. Therefore, according to the present embodiment, the digital audio data is temporarily stored, and when performing the volume increasing process on the digital audio data, while suppressing an increase in the storage capacity for storing the digital audio data, Volume increase processing can be performed in real time.

  Further, in the present embodiment, before performing the volume increasing process, the processing unit reduces the volume of the digital audio data obtained by the obtaining unit by a predetermined value with respect to the digital audio data. Processing (in this embodiment, audio processing by the shift-down processing unit 30) is performed. Therefore, according to the present embodiment, it is possible to prevent the occurrence of saturation of digital audio data which may occur with an increase in the volume due to the volume increase process.

  Further, in the present embodiment, the processing unit further delays the phase of the digital audio data in a band equal to or lower than a predetermined frequency band from the phase of a higher frequency band with respect to the digital audio data ( In the present embodiment, audio processing by the phase converter 34 is performed. Therefore, according to the present embodiment, it is possible to improve the reproduced sound by the digital audio data more effectively.

  In the present embodiment, the processing unit further extracts first audio data up to one octave below a predetermined crossover frequency from the digital audio data, and extracts the first audio data from the extracted first audio data. Pseudo-overtone generation processing is performed to make the frequency of one audio data slightly more than twice. In the present embodiment, the processing unit performs a reduction process of reducing the amplitude of the second audio data obtained by performing the pseudo-overtone generation process by a predetermined amount. In the present embodiment, the processing section adds the third audio data obtained by performing the reduction processing to a band equal to or higher than the crossover frequency of the digital audio data (in the present embodiment, the high-frequency Voice processing by the band conversion unit 36). Therefore, according to the present embodiment, it is possible to improve the reproduced sound by the digital audio data more effectively.

  Further, in the present embodiment, the processing unit further performs a process of artificially adding the component of the resonance frequency of the cartridge and the vinyl record board to a high frequency band higher than a predetermined frequency of the digital audio data. (In the present embodiment, audio processing by the resonance frequency signal adding unit 38) is performed. Therefore, according to the present embodiment, it is possible to improve the reproduced sound by the digital audio data more effectively.

  In the present embodiment, the processing unit further performs a process of adding a hiss noise component generated on the magnetic tape to the digital audio data (in the present embodiment, the audio process by the hiss noise adding unit 40). . Therefore, according to the present embodiment, it is possible to improve the reproduced sound by the digital audio data more effectively.

  In the present embodiment, the processing unit further performs a process of adding a subsonic component to the digital audio data (in the present embodiment, the audio process by the subsonic band adding unit 42). Therefore, according to the present embodiment, it is possible to improve the reproduced sound by the digital audio data more effectively.

  In the present embodiment, the processing unit further adds a crosstalk component to each digital audio data of the left and right channels in the digital audio data (in this embodiment, the processing by the crosstalk adding unit 44 is performed). Voice processing). Therefore, according to the present embodiment, it is possible to improve the reproduced sound by the digital audio data more effectively.

  In the present embodiment, the processing unit further enhances or attenuates the high-frequency component higher than a predetermined frequency with respect to the digital audio data (the present embodiment). In, the sound processing by the treble region volume increase / decrease processing unit 46 is performed. Therefore, according to the present embodiment, it is possible to improve the reproduced sound by the digital audio data more effectively.

  In particular, in the present embodiment, a selection instruction indicating which of the processing of the emphasis and the attenuation is applied is received, and the processing unit performs processing of any of the emphasis and the attenuation according to the received selection instruction. Have done selectively. Therefore, according to the present embodiment, any desired processing of the emphasis and the attenuation can be performed.

  As described above, the present invention has been described using the embodiment, but the technical scope of the present invention is not limited to the scope described in the above embodiment. Various changes or improvements can be made to the above-described embodiment without departing from the spirit of the invention, and embodiments with such changes or improvements are also included in the technical scope of the present invention.

  In addition, the above embodiments do not limit the invention according to the claims (claims), and all combinations of the features described in the embodiments are not necessarily essential to the solution of the invention. Absent. The embodiments described above include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. Even if some components are deleted from all the components shown in the embodiment, a configuration from which these some components are deleted can be extracted as an invention as long as the effect is obtained.

  For example, in the above-described embodiment, as the audio processing device 10, an audio reproducing / recording device having a function of reproducing digital audio data and a function of adding digital audio data to a preset audio process and recording the digital audio data. 20 has been described. However, the present invention is not limited to this, and, for example, a form in which a sound reproducing apparatus having only a function of reproducing digital sound data may be applied as the sound processing apparatus 10. In addition, as the audio processing device 10, a form in which an audio recording device having only a function of performing a predetermined audio process on digital audio data and then recording the digital audio data and then recording the digital audio data may be applied.

  Further, in the above-described embodiment, a case has been described in which various types of audio processing according to the present invention are executed using a DSP, but the present invention is not limited to this. For example, the present invention may be executed by software, a combination of hardware and software, or only hardware.

  Further, in the above-described embodiment, the case has been described in which the user specifies which of the attenuation process and the enhancement process is to be executed by the high-tone region volume increase / decrease processing unit 46, but the present invention is not limited to this. For example, one of the attenuation process and the enhancement process may be fixedly executed.

  Further, in the above-described embodiment, a case has been described where the processing by the shift-down processing unit 30 is always executed when the audio processing by the dynamic range conversion unit 32 is executed, but the present invention is not limited to this. . For example, the processing by the shift-down processing unit 30 may be omitted depending on the digital audio data to be processed, the dynamic range change range by the dynamic range conversion unit 32, and the like.

  Further, not all of the audio processing units provided in the DSP 28 according to the above embodiment are essential, and it is sufficient that at least one of the audio processing units is provided.

  Further, in the above-described embodiment, the case has been described where the sound processing in each part such as the dynamic range conversion part 32 and the phase conversion part 34 is executed independently for each part. However, the present invention is not limited to this. For example, a smaller number of components having the same name, such as a memory, an FFT unit, an IFFT unit, and an audio data integration unit, in each unit may be prepared, and may be shared by a plurality of units.

  Further, in the above-described embodiment, the case has been described where the audio processing in each part such as the dynamic range conversion unit 32 and the phase conversion unit 34 is performed by digital signal processing. However, the present invention is not limited to this. For example, a form may be adopted in which audio processing is performed by analog signal processing for at least one of the parts.

  In the above embodiment, the case where stereo audio data is applied as the digital audio data of the present invention has been described, but the present invention is not limited to this. For example, monaural audio data or multi-channel audio data of three or more channels may be applied as the digital audio data of the present invention.

  In addition, the configuration of the audio reproduction / recording device 20 described in the above embodiment (see FIG. 2) is an example, and unnecessary components may be deleted or a new configuration may be made without departing from the gist of the present invention. It goes without saying that elements can be added.

  Furthermore, the flow of the audio reproduction / recording process shown in the above embodiment (see FIG. 22) is also an example, and unnecessary steps are deleted or new steps are added without departing from the gist of the present invention. Needless to say, the order of the steps can be changed or the order of the steps can be changed.

Reference Signs List 10 audio processing device 11 acquisition unit 12 processing unit 13 execution unit 20 audio reproduction / recording device 21 CPU
23 storage unit 23A sound reproduction / recording program 23A1 acquisition process 23A2 processing process 23A3 execution process 26 optical drive 28 DSP
Reference Signs List 30 shift down processing unit 32 dynamic range conversion unit 34 phase conversion unit 36 high frequency band conversion unit 38 resonance frequency signal addition unit 40 hiss noise addition unit 42 subsonic band addition unit 44 crosstalk addition unit 46 treble region volume increase / decrease processing unit 60 record Medium

In order to achieve the above object, an audio processing device according to the present invention includes an acquisition unit that acquires digital audio data, and reproduces audio recorded on a vinyl record board with respect to the digital audio data acquired by the acquisition unit. comprising a processing unit that performs a process of adding a component of a resonance frequency occurring in the record player, and a performing unit for performing at least one of reproducing and recording of digital audio data processing is performed that by the processing unit for ing.

Here, in the present invention, the processing unit performs a process of adding, to the digital audio data acquired by the acquiring unit, a component of a resonance frequency generated in a record player that reproduces audio recorded on a vinyl record board. . In the present invention, the execution unit, at least one of reproducing and recording of digital audio data processing is performed that by the processing unit is executed.

As described above, according to the audio processing device of the present invention, the digital audio data is acquired, and the component of the resonance frequency generated in the record player that reproduces the audio recorded on the vinyl record board is obtained for the acquired digital audio data. performs a process of adding, since running at least one of reproducing and recording of digital audio data subjected to formulation sense, as compared to the case without the treatment, more effectively reproducing sound by digital audio data Can be modified.
In the present invention, the processing unit may perform a process of adding a subsonic component, which is a resonance caused by a relative relationship between the arm of the record player and the cartridge, to the digital audio data as the above process. As a result, it is possible to improve the reproduced sound by the digital audio data more effectively.
Further, in the present invention, the subsonic component may be a signal imitating the frequency of a human brain wave, or a signal having first to third frequencies of Schumann resonance.
Further, according to the present invention, the processing section may perform, as the above processing, audio recorded on a vinyl record board using a cartridge provided with a record needle for a high frequency band higher than a predetermined frequency of digital audio data. May be performed to artificially add the component of the resonance frequency between the cartridge and the vinyl record disc when reproducing. As a result, it is possible to improve the reproduced sound by the digital audio data more effectively.
In the present invention, the component of the resonance frequency may be a triangular wave, a saw-tooth wave, or a component based on an actual resonance frequency acquired in advance.
Further, in the present invention, the processing unit may perform the above processing by at least one of a digital signal processor, an analog signal processing, and software.
Further, in the present invention, when the processing unit is configured by a digital signal processor, and when a plurality of processes are performed as the above-described processes, the components that can be shared between the processes may be shared.
In the present invention, the digital audio data may be stereo audio data, monaural audio data, or multi-channel audio data of three or more channels.

On the other hand, in order to achieve the above object, the sound processing method of the present invention obtains digital sound data, and generates a resonance in a record player for reproducing sound recorded on a vinyl record board with respect to the obtained digital sound data. The computer is caused to execute processing including adding a frequency component , and executing at least one of reproduction and recording of the digital audio data on which the processing is performed.

Therefore, according to the audio processing method of the present invention, since the operation is performed in the same manner as the audio processing apparatus of the present invention, the digital audio is more effectively performed as compared with the case where the above processing is not performed. The sound reproduced by the data can be modified.

Claims (12)

An acquisition unit that acquires digital audio data;
For the digital audio data acquired by the acquisition unit, a processing unit that performs a volume increase process that increases the volume as the value of the digital audio data increases,
An execution unit that executes at least one of reproduction and recording of digital audio data on which the volume increase process has been performed by the processing unit;
An audio processing device comprising: The audio processing device according to claim 1, wherein the processing unit performs, as the volume increase process, a process of increasing the volume as the maximum value of a series of digital audio data having the immediately preceding reverse polarity in chronological order increases. The processing unit performs a process of reducing a volume of the digital audio data obtained by the obtaining unit by a predetermined value before performing the volume increasing process. Alternatively, the audio processing device according to claim 2. The processing unit further performs, on the digital audio data, a process of delaying a phase of a band equal to or lower than a predetermined frequency band of the digital audio data from a phase of a frequency band higher than the frequency band. Item 4. The audio processing device according to any one of items 3. The processing unit further extracts, from the digital audio data, first audio data up to one octave below a predetermined crossover frequency, and calculates a frequency of the first audio data for the extracted first audio data. A pseudo overtone generation process of slightly more than twice is performed, a reduction process is performed to reduce the amplitude of the second audio data obtained by this by a predetermined amount, and the third audio data obtained by the digital The audio processing device according to claim 1, wherein a process of adding the audio data to a band equal to or higher than the crossover frequency is performed. The processing unit, further, for a high frequency band higher than a predetermined frequency of the digital audio data, in the case of reproducing the sound recorded on a vinyl record using a cartridge provided with a record needle, The audio processing device according to claim 1, wherein a process of artificially adding a component of a resonance frequency between the cartridge and the vinyl record board is performed. The audio processing device according to claim 1, wherein the processing unit further performs a process of adding a hiss noise component generated on a magnetic tape to the digital audio data. The audio processing device according to any one of claims 1 to 7, wherein the processing unit further performs a process of adding a subsonic component to the digital audio data. The digital audio data is information indicating stereo audio,
The audio processing according to any one of claims 1 to 8, wherein the processing unit further performs a process of adding a crosstalk component to each digital audio data of the left and right channels in the digital audio data. apparatus. 10. The processing unit according to claim 1, wherein the processing unit further performs, on the digital audio data, a process of emphasizing a high frequency component higher than a predetermined frequency or a process of attenuating the high frequency component. The audio processing device according to claim 1. Further comprising a receiving unit for receiving a selection instruction indicating which of the processing of the emphasis and the attenuation is applied,
The audio processing device according to claim 10, wherein the processing unit selectively performs one of the emphasis and the attenuation processing according to a selection instruction received by the reception unit. Get digital audio data,
For the acquired digital audio data, perform a volume increasing process to increase the volume as the value of the digital audio data increases,
Performing at least one of reproduction and recording of the digital audio data subjected to the volume increase processing,
Audio processing method for causing a computer to execute a process including: