JP6616099B2 - Audio processing device - Google Patents

Description

The present invention relates to speech processing equipment that performs sound processing on the digital audio data.

  In recent years, digital audio reproducing apparatuses that reproduce digital audio recording media such as CD (Compact Disc) and SACD (Super Audio CD) have become widespread. On the other hand, until the mid-1980s, an analog sound reproducing device (hereinafter also referred to as “record player”) that reproduces vinyl record discs such as EP discs and LP discs mainly made of materials such as vinyl chloride with a needle type playback device. ) Was mainstream. Note that “speech” as used in the present specification includes a sound generated only by a person's utterance, a sound generated only by music, and a sound obtained by integrating a person's utterance and music.

  Compared with analog audio playback devices, digital audio playback devices are superior in catalog characteristics such as Wow and Flutter and S / N ratio (Signal to Noise Ratio). Many users feel that the reproduced sound is superior in sound quality. This is because the digital audio playback device generates almost no noise or distortion in the general audible frequency band of human beings, so it feels different from the analog audio playback device and is familiar with the audio played by the analog audio playback device. This is because the user feels uncomfortable.

  Therefore, as a technique that can be applied to solve this problem, Patent Document 1 describes that a silent groove record board is manufactured, and the record board is played with a record player to generate a needle sound, and the needle sound is recorded. Thus, a music playback device that mixes with the performance sound of digital audio is disclosed.

  Further, Patent Document 2 discloses a noise generating unit that generates simulated noise that simulates noise, and a mixing that mixes the simulated noise generated by the noise generating unit with an audio signal based on a digital signal recorded on a recording medium. And a digital playback apparatus having the means.

  Further, Patent Document 3 discloses an audio that is reproduced by adding an output having a spectrum in a frequency band exceeding the upper limit of the high frequency range of the reproduction frequency band or the upper limit of the high frequency range of the audible frequency band to the original sound signal. A signal reproduction method is disclosed. In this acoustic signal reproduction method, the output added to the original acoustic signal is a noise component similar to a random or random signal obtained from a signal source separate from the acoustic signal, and from this noise component, a predetermined frequency band is obtained. The selected component is added to the original sound signal for reproduction.

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

  However, the techniques disclosed in the patent documents 1 to 3 described above both superimpose actually recorded needle sounds and simulated noises on the audio signal, and do not necessarily reproduce the reproduced sound. There was a problem that the properties themselves could not be improved sufficiently. In the following description, improving the sound property indicated by the digital sound data is referred to as “reforming”.

The present invention has been made to solve the above problems, and an object thereof is to provide a speech processing equipment capable of effectively modifying the reproduced sound due to the digital audio data.

In order to achieve the above object, an audio processing apparatus according to the present invention includes an acquisition unit that acquires digital audio data, and the volume of the digital audio data obtained by the acquisition unit increases as the value of the digital audio data increases. A processing unit that performs a volume increase process for increasing the volume, and an execution unit that executes at least one of reproduction and recording of the digital audio data that has been subjected to the volume increase process by the processing unit.

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

Here, in the present invention, the processing unit performs a volume increasing process for increasing the volume of the digital audio data acquired by the acquiring unit as the value of the digital audio data increases. In the present invention, the execution unit executes at least one of reproduction and recording of the digital audio data subjected to the volume increase processing by the processing unit.

  That is, when an analog audio signal indicating the above sound is generated by tracing the sound groove of a vinyl record board 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 groove is deformed and rebounded by the elasticity of the vinyl record, which causes the dynamic range of the analog audio signal to temporarily increase.

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 so that the volume increases as the value of the digital audio data increases. . Thereby, compared with the case where the volume increasing process is not performed, it is possible to modify the reproduced sound based on the digital audio data more effectively.

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 the volume increasing process for increasing the volume as the value of the digital audio data increases. Since at least one of playback and recording of digital audio data that has been subjected to volume increase processing is executed, compared to the case where volume increase processing is not performed, the playback sound based on digital audio data can be modified more effectively. Can do.
In the present invention, the processing unit performs a process of reducing the volume of the digital audio data by a predetermined value with respect to the digital audio data acquired by the acquisition unit prior to performing the volume increasing process. May be. As a result, it is possible to prevent the occurrence of saturation of digital audio data that may occur as the volume increases due to the volume increase process.
In the present invention, the processing unit may further perform a process of adding a Hiss Noise component generated in the magnetic tape to the digital audio data. Thereby, the reproduction sound by digital audio data can be improved more effectively.
In the present invention, the processing unit may further perform processing for emphasizing high frequency components higher than a predetermined frequency or processing for performing attenuation of the high frequency components on the digital audio data. Thereby, the reproduction sound by digital audio data can be improved more effectively.

Here, according to the present invention, the processing unit may perform a process of increasing the volume as the maximum value of a series of digital audio data having a reverse polarity immediately before in time series order increases as the volume increase process. As a result, when the digital audio data is temporarily stored and the volume increase process is performed on the digital audio data, the volume increase process 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, since the amplitude of the sound waveform is larger as the frequency is lower, if the process of increasing the volume as the value of the digital audio data is simply increased by the volume increase process on the digital audio data, the frequency decreases. The amount of increase in volume will increase relatively.

  Therefore, in the present invention, it is preferable that the processing unit performs the volume increase process so that the volume increase is relatively decreased as the frequency of the digital audio data is decreased. 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 volume increase is relative to the divided region having a lower frequency between the divided regions. It is preferable to perform a volume increase process so as to reduce the frequency. As a result, it is possible to modify the reproduced sound based on the digital audio data with higher accuracy.

  Further, according to the present invention, the processing unit further performs a process on the digital audio data so as to delay the phase of a band below the predetermined frequency band of the digital audio data from the phase of the frequency band higher than the band. Also good. Thereby, the reproduction sound by digital audio data can be improved more effectively.

  In the present invention, the processing unit further extracts first audio data from the digital audio data up to one octave below a predetermined crossover frequency, and the first audio data is extracted from the extracted first audio data. A third harmonic data is obtained by performing a pseudo harmonic overtone generation process for making the frequency of the data a little more than twice, and reducing the amplitude of the second voice data obtained thereby by a predetermined amount. May be added to a band equal to or higher than the crossover frequency of the digital audio data. Thereby, the reproduction sound by digital audio data can be improved more effectively.

  Further, according to the present invention, the processing unit further reproduces the sound recorded on the vinyl record board using a cartridge provided with a record needle for a high frequency band higher than a predetermined frequency of the digital sound data. In this case, a process of artificially adding a resonance frequency component between the cartridge and the vinyl record board may be performed. Thereby, the reproduction sound by digital audio data can be improved more effectively.

  In the present invention, the processing unit may further perform a process of adding a subsonic component to the digital audio data. Thereby, the reproduction sound by digital audio data can be improved more effectively.

  In the present invention, the digital audio data is information indicating stereo audio, and the processing unit further adds a crosstalk component to the digital audio data of the left and right channels in the digital audio data. May be performed. Thereby, the reproduction sound by digital audio data can be improved more effectively.

  In the present invention, the processing unit may further perform processing for emphasizing high frequency components higher than a predetermined frequency or processing for performing attenuation of the high frequency components on the digital audio data. Thereby, the reproduction sound by digital audio data can be improved more effectively.

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

According to the speech processing equipment of the present invention, it is possible to effectively modify the playback sound by digital audio data, the effect is obtained that.

It is a functional block diagram of the audio processing device according to the embodiment. It is a block diagram which shows an example of schematic structure of the audio | voice reproduction | regeneration / recording apparatus which concerns on embodiment. It is a block diagram which shows an example of the execution flow of the digital signal processor which concerns on embodiment. It is a figure with which it uses for description of the dynamic range conversion part which concerns on embodiment, and is sectional drawing which shows an example of the shape of the sound groove in a vinyl record board. It is a figure with which it uses for description of the dynamic range conversion part which concerns on embodiment, and is a top view which shows an example of the state of the sound groove in a vinyl record board, and the trace state by a record needle. It is an example of the waveform diagram with which it uses for description of the volume increase process which concerns on embodiment. It is a block diagram which shows an example of a structure of the dynamic range conversion part which concerns on embodiment. FIG. 5 is a diagram for explaining a phase conversion unit according to the embodiment and is a graph illustrating an example of a mechanical impedance characteristic of a cartridge. It is a block diagram which shows an example of a structure of the phase conversion part which concerns on embodiment. It is a figure which uses for description of the phase conversion part which concerns on embodiment, and is a graph which shows an example of the data of the frequency domain of the digital audio | voice data after being divided | segmented by the frequency division part. It is a figure which uses for description of the high frequency band conversion part which concerns on embodiment, and is a graph which shows an example of the data of the frequency domain of digital audio data. It is a figure with which it uses for description of the high frequency band conversion part which concerns on embodiment, and is a graph which shows an example of the state which integrated the audio data of the pseudo overtone with the digital audio data. It is a block diagram which shows an example of a structure of the high frequency band conversion part which concerns on embodiment. It is a figure with which it uses for description of the resonant frequency signal addition part which concerns on embodiment, and is a graph which shows an example of a triangular wave. It is a figure with which it uses for description of the resonant frequency signal addition part which concerns on embodiment, and is a graph which shows an example of a sawtooth wave. It is a figure with which it uses for description of the resonant frequency signal addition part which concerns on embodiment, and is a graph which shows the other example of a sawtooth wave. It is a block diagram which shows an example of a structure of the resonant frequency signal addition part which concerns on embodiment. It is a block diagram which shows an example of a structure of the hiss noise addition part which concerns on embodiment. It is a block diagram which shows an example of a structure of the subsonic band addition part which concerns on embodiment. It is a block diagram which shows an example of a structure of the crosstalk addition part which concerns on embodiment. It is a block diagram which shows an example of a structure of the high sound area | region volume increase / decrease processing part which concerns on embodiment. It is a flowchart which shows an example of the audio | voice reproduction | regeneration / recording process which concerns on embodiment. It is the schematic which shows an example of the initial setting screen which concerns on embodiment. It is the schematic which shows an example of the change state of the initial setting screen which concerns on embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 shows a sound processing apparatus 10 according to the present embodiment. As shown in FIG. 1, the speech processing apparatus 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 apparatus 10 according to the present embodiment, digital audio data is acquired from the recording medium 60 mounted in the apparatus, but the present invention is not limited to this. For example, digital audio data may be acquired from an external device by wired communication or wireless communication.

  In addition, 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. The execution unit 13 then executes at least one (both in the present embodiment) of reproduction and recording of digital audio data that has been subjected to various types of audio processing by the processing unit 12.

  The acquisition unit 11 in the voice 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. Hereinafter, as an example, the present invention is applied to various audio processings applied to digital audio data recorded on a CD and reproduced in real time, and the digital audio data is stored in a built-in storage unit. The case where it applies to a processing apparatus is demonstrated.

  The audio processing apparatus 10 described above can be realized by the audio reproduction / recording apparatus 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 audio processing designated in advance on the digital audio data written in 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 a D / A converter. 80, the sound is reproduced by the speaker 83 through the filter 81 and the amplifier 82.

  The storage unit 23 can be realized by an HDD (Hard Disk Drive), a flash memory, or the like. The storage unit 23 stores an audio reproduction / recording program 23A for causing the audio reproduction / recording device 20 to function as the audio processing device 10. In the audio reproducing / recording device 20 according to the present embodiment, an audio reproducing / 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 and develops 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. Further, the CPU 21 operates as the processing unit 12 illustrated in FIG. 1 by executing the processing process 23A2. Furthermore, the CPU 21 operates as the execution unit 13 illustrated in FIG. 1 by executing the execution process 23A3.

  In the audio playback / recording apparatus 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 sound reproduction / recording apparatus 20 that has executed the sound reproduction / recording program 23 </ b> A functions as the sound processing apparatus 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 downshift 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 increasing / decreasing processing unit 46.

  Prior to the execution of audio processing by the dynamic range converter 32, the downshift processor 30 reduces the volume of the digital audio data by a predetermined value with respect to the digital audio data acquired by the acquisition unit 11. Process. Note that the downshift processing unit 30 according to this embodiment performs a process of shifting down the 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, it is assumed that the volume of the digital audio data is increased by the dynamic range conversion unit 32 at a maximum magnification of about 6 dB. Therefore, the downshift processing unit 30 according to the present embodiment. Then, for example, 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 volume increase processing for the input digital audio data so that the volume increases as the value of the digital audio data increases. In the dynamic range conversion unit 32 according to the present embodiment, as a volume increasing process, the input digital audio data is traced with a record needle on the sound groove of a vinyl record board in which audio is recorded in an analog manner. When an analog audio signal indicating the audio is generated, an increase in volume corresponding to an increase in dynamic range due to deformation and rebound of the sound groove caused by the record needle colliding with the inclined surface of the sound groove is reflected. Process.

  That is, as shown in FIGS. 4 and 5, the sound groove 50 of the vinyl record board is meandering in a V shape in cross section, 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 right channel sound.

  Here, when reproducing the sound recorded on the vinyl record board, the tip of the record needle 52 relatively moves (traces) along the sound groove 50 while the vinyl record board is rotated. . At this time, as an example, the distal end portion of the record needle 52 relatively moves in the direction indicated by the arrow A in FIG. 5, and the distal end portion collides with one inclined surface of the sound groove 50, so A dynamic load is applied, and the portion of the sound groove 50 where the tip of the record needle 52 collides is deformed. Due to the repulsion of the tip of the record needle 52 in response to the deformation of the sound groove 50, the acceleration of the record needle 52 in the direction indicated by the arrow B in FIG. 5 is increased. Due to this increase in 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 dynamic load at this time depends on the needle tip weight of the cartridge provided with the record needle 52, the characteristics and shape of the needle tip of the record needle 52, the material of the vinyl record board, and the like. In general, the ratio of the inclined surface of the sound groove 50 to the depth a (see FIG. 4) from the surface of the vinyl record board is about 10%. In this case, the amount of expansion of the dynamic range of the sound is at least about several dB as the volume expansion magnification.

  On the other hand, in a digital audio recording medium such as CD or SACD, since there is no sound groove itself, the expansion of the dynamic range due to deformation of the sound groove or repulsion due to elasticity does not occur. Many users feel unsatisfactory.

  Therefore, the dynamic range conversion unit 32 according to the present embodiment reflects the volume increase corresponding 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 amount of deformation of the sound groove 50 due to the collision of the tip of the record needle 52 becomes larger as the sound volume is larger. As the volume increases, the amount of expansion of the dynamic range increases as the volume increases. Therefore, in the dynamic range conversion unit 32 according to the present embodiment, the volume increase is increased as the value of the digital audio data is increased.

  In the dynamic range conversion unit 32 according to the present embodiment, as shown in FIG. 6 as an example, the volume increase is increased as the peak value immediately before the digital audio data to be increased is larger. In the example shown in FIG. 6, the dynamic range conversion unit 32 has a volume increase p1 corresponding to the magnitude of the peak value P1 of a series of digital audio data that is initially positive, and a series of digital that is immediately negative. Increase the volume uniformly for audio data. Following this, the dynamic range conversion unit 32 increases the volume p2 corresponding to the magnitude of the peak value P2 of the series of digital audio data having the negative polarity, and the next positive series of digital audio data having the positive polarity. And raise it uniformly. Thereafter, the dynamic range converter 32 repeats the same processing until there is no more digital audio data to be processed.

  However, the volume increase processing is not limited to this form. For example, instead of a form in which the peak value serving as a reference for the volume increase is changed to a peak value immediately before the digital audio data to be increased, the peak value It is good also as a peak value just before. Further, for example, the volume increase applied to the digital audio data may be increased as the value of the digital audio data itself to be increased in volume increases.

  In order to realize the function of pseudo-expanding the above dynamic range, the dynamic range conversion unit 32 according to the present embodiment includes a left channel audio memory 32A and a right channel audio memory as shown in FIG. A memory 32B is provided. In addition, the dynamic range conversion unit 32 according to the present embodiment includes a peak detection unit 32C and a zero-cross detection unit 32D, which are shared by the left and right channels, respectively, and an audio data raising unit 32E for the left channel audio. An audio data raising unit 32F for right channel audio is provided.

  The memory 32A stores the digital audio data L for the left channel, and the memory 32B stores the digital audio data R for the right channel. The peak detector 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 detection unit 32D detects a portion of a node from which the density of sound waves disappears from the digital audio data L and the digital audio data R, that is, a time point when a zero cross occurs. Further, the audio data raising unit 32E adds to the digital audio data L a value corresponding to the volume increase corresponding to the peak value detected from the digital audio data L by the peak detection unit 32C. Similarly, the audio data raising unit 32F adds to the digital audio data R a value corresponding to the volume increase corresponding to the peak value detected from the digital audio data R by the peak detection unit 32C. .

  That is, in the dynamic range conversion unit 32, the digital audio data L is temporarily stored in the memory 32A. Next, the digital sound 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 point in time next detected is specified. Then, the audio data raising unit 32E adds a value corresponding to the peak value detected by the peak detection unit 32C to the specified digital audio data L.

  Similarly, in the dynamic range conversion unit 32, the digital audio data R is temporarily stored in the memory 32B. Next, the digital sound 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 in time to the point in time next detected is specified. Then, the audio data raising unit 32F adds a value 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 digital audio data to be processed.

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

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

  By the way, as described above, generally, the amplitude of the sound waveform increases as the frequency decreases, so that the volume of the digital audio data is simply increased as the value of the digital audio data increases by the volume increase process. As the frequency decreases, the volume increase increases relatively.

  Therefore, the dynamic range conversion unit 32 may perform a volume increase process so that the volume increase is relatively decreased as the frequency of the digital audio data is decreased. In particular, the dynamic range conversion unit 32 may perform the sound volume increasing process so that the volume increase amount becomes relatively smaller in the divided region having a lower frequency. 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 volume increase amount is relative to a divided region having a lower frequency between the divided regions. The volume increase processing may be performed so that the volume is reduced.

  As a result, it is possible to modify the reproduced sound based on the digital audio data with higher accuracy.

  On the other hand, the phase conversion unit 34 performs a process for delaying the phase of a band below a predetermined frequency band of the digital audio data from the phase of a frequency band higher than the band for the input digital audio data.

  That is, as described above, the sound groove of the vinyl record board is deformed by tracing by the tip portion of the record needle. Further, as shown in FIG. 8 as an example, the cartridge provided with the record needle has a mechanical impedance characteristic in which the low frequency region (bass) has a higher value than the middle frequency region (medium). The mechanical impedance is a value representing the difficulty of mechanical movement of the structure, and indicates that the mechanical impedance is easy to move if the mechanical impedance is small, and difficult to move if the mechanical impedance is large.

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

  Here, since human hearing is most sensitive 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 phase conversion that delays the phase of the input digital audio data in a frequency band of 2 kHz or less. However, the phase conversion is not limited to this frequency band but may be performed for other frequency bands.

  In order to realize the function of performing the above 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. Yes. In addition, the phase conversion unit 34 according to the present embodiment includes a frequency division unit 34C, an FFT (Fast Fourier Transform) unit 34D, a phase angle change unit 34E, and an IFFT (shared IFFT) (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 left channel digital audio data L, and the memory 34B stores right channel digital audio data R. The frequency dividing unit 34C divides the digital audio data L and the digital audio data R by a predetermined frequency (here, 2 kHz). Further, the frequency dividing unit 34C stores the high frequency data of the divided digital audio data L in the memory 34A, and stores the high frequency data of the divided digital audio data R in the memory 34B. Then, the frequency division unit 34C outputs the low frequency data of the divided digital audio data L and digital audio data R to the FFT unit 34D.

  Further, the FFT unit 34D performs fast Fourier transform on the data on the low frequency side of each of the digital audio data L and the digital audio data R obtained by the frequency dividing unit 34C, so that the low frequency side of the left and right channels The frequency domain data corresponding to each of the voices is generated. The phase angle changing unit 34E relatively delays 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. The IFFT unit 34F returns the data in the low frequency region whose phase angle is delayed by the phase angle changing unit 34E to digital audio data.

  Further, the LPF 34G extracts only data below the predetermined frequency from the digital audio data obtained by the IFFT unit 34F. 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 the data obtained based on the digital audio data L by the LPF 34G. Thus, digital audio data L subjected to 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 the 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, the phase converter 34 stores the digital audio data L in the memory 34A and the digital audio data R in the memory 34B. Further, in the phase conversion unit 34, each of the digital audio data stored in the memory 34A and the memory 34B is divided by the frequency division unit 34C with the predetermined frequency (2 kHz in the present embodiment) as a boundary, The high frequency data of the digital audio data L is stored in the memory 34A, and the high frequency data of the digital audio data R is stored in the memory 34B.

  Next, in the phase conversion unit 34, the low frequency 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. Thereby, as shown in FIG. 10 as an example, data in the low frequency region corresponding to the sound 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 left and right channel sounds by a predetermined phase angle. For example, when delaying with respect to data having a frequency of 100 Hz, since one period of data at the frequency is 10 ms (= 1 ÷ 100), in order to delay the phase angle by 90 degrees as an example, 2.5 ms (= 10 ÷ 4) It will be delayed.

  In the phase angle changing unit 34E according to the present embodiment, 45 degrees is applied as the predetermined phase angle for the sake of simplicity, but the present invention is not limited to this. For example, another phase angle such as 22.5 degrees, 67.5 degrees, 90 degrees, or the like may be applied. Further, the phase angle may be changed depending on the frequency. Further, the phase angle 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 conversion unit 34, the IFFT unit 34F returns the data in the low frequency region corresponding to the sound of the left and right channels, the phase angle of which is delayed by the phase angle changing unit 34E, to the digital audio data, and the LPF 34G Only data below the predetermined frequency is extracted from the digital audio data corresponding to the audio of the left and right channels.

  Then, in the phase conversion unit 34, the high frequency side data of the digital audio data L stored in the memory 34A by the audio data integration unit 34H 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 above-mentioned high frequency side data of the digital audio data R stored in the memory 34B by the audio data integration unit 34I 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.

  Thus, in the phase converter 34 according to the present embodiment, the frequency domain is divided by the frequency divider 34C before the FFT unit 34D. However, the present invention is not limited to this. For example, frequency domain division may be performed in a state where digital audio data is converted into frequency domain data by the FFT unit 34D instead of the frequency division unit 34C. Further, instead of the phase angle changing unit 34E, the phase angle may be changed after the IFFT unit 34F. Further, instead of the LPF 34G, only the data below the predetermined frequency may be extracted before the IFFT unit 34F.

  By the way, although the sampling frequency adopted in CD is 44.1 kHz, it is difficult to perform faithful recording and reproduction in a frequency band of about 20 kHz at this sampling frequency. That is, the musical sound in the vicinity of 20 kHz generally has a very complicated waveform, and it is difficult to faithfully reproduce the sound only by sampling at most several points on the waveform.

  Therefore, as shown in FIG. 11 as an example, the high frequency band conversion unit 36 according to the present embodiment has a predetermined crossover frequency (18 kHz in the example shown in FIG. 11) from the input digital audio data. First audio data up to an octave below (9 kHz in the example shown in FIG. 11) is extracted. In addition, the high frequency band conversion unit 36 performs a pseudo harmonic generation process for making the frequency of the first audio data slightly more than twice the extracted first audio data. Further, the high frequency band converter 36 reduces the amplitude of the second audio data obtained as described above by a predetermined amount (in this embodiment, one half of the amplitude of the second audio data). I do. Then, the high frequency band converter 36 performs a process of adding the third audio data obtained by the reduction process to the band of the crossover frequency of the digital audio data as shown in FIG. 12 as an example.

  In order to realize the function of performing the above high frequency band conversion, 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, as shown in FIG. A memory 36B is provided. In addition, 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, which are shared by the left and right channels. An attenuator 36H and a BPF (Band-Pass Filter) 36I are provided. Further, the high frequency band converting unit 36 includes an audio data integration unit 36J for audio of the left channel and an audio data integration unit 36K for audio of the right channel.

  The memory 36A stores digital audio data L for the left channel, and the memory 36B stores digital audio data R for the right channel. The frequency dividing 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 dividing unit 36C outputs each of the divided digital audio data L and digital audio data R to the FFT unit 36D.

  Also, the FFT unit 36D performs 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 performing frequency domain corresponding to each audio of the left and right channels. Generate data. The frequency extraction unit 36E extracts data in the frequency band up to one octave below the crossover frequency in the frequency domain data obtained by the FFT unit 36D. In addition, the pseudo overtone generation unit 36F performs the above-described pseudo overtone generation process on the data extracted by the frequency extraction unit 36E. The IFFT unit 36G returns the data that has been subjected to the pseudo harmonic generation processing by the pseudo harmonic generation unit 36F to digital audio data.

  In addition, the attenuator 36H performs the reduction process on the digital audio data obtained by the IFFT unit 36G. Further, the BPF 36I extracts only the data in the frequency band up to one octave above the crossover frequency from the digital audio data that has been reduced 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. Thus, the digital audio data L that has been converted in the high frequency band is created. Similarly, the audio data integration unit 36K integrates (synthesizes) the data obtained on the basis of the digital audio data R by the BPF 36I into 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 that has been converted in the high frequency band is created.

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

  Next, in the high frequency band converting unit 36, data corresponding to the left and right channel audio divided by the frequency dividing unit 36C is converted into frequency domain data 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 sounds, and the pseudo overtone generation unit 36F supports the left and right channel sounds. Then, the pseudo harmonic overtone generation process that is slightly more than twice the calculated value is performed on the data in the frequency domain.

  Next, in the high frequency band converting unit 36, the IFFT unit 36G returns the data in the frequency domain corresponding to the sound of the left and right channels subjected to the pseudo harmonic generation processing by the pseudo harmonic generation unit 36F to the digital audio data, and the attenuator The digital audio data corresponding to the audio of the left and right channels is reduced by 36H, and then one octave of the crossover frequency is converted from the digital audio data corresponding to the audio of the left and right channels by BPF 36I. Only the data in the frequency band up to the top is extracted.

  Then, in the high frequency band converting unit 36, the audio data integrating unit 36J has obtained the band above the crossover frequency of the digital audio data L stored in the memory 36A based on the digital audio data L by the BPF 36I. By integrating (synthesizing) the data, digital audio data L subjected to high frequency band conversion is created and output. Similarly, in the high frequency band conversion unit 36, the audio data integration unit 36K obtains a band of the digital audio data R stored in the memory 36B above the crossover frequency based on the digital audio data R by the BPF 36I. By integrating (synthesizing) the obtained data, the digital audio data R converted in the high frequency band is generated and output.

  As described above, in the high frequency band converting unit 36 according to the present embodiment, the frequency domain is divided by the frequency dividing unit 36C before 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 division may be performed in a state where the digital audio data is converted into the frequency domain data by the FFT unit 36D. Further, in place of the pseudo overtone generation unit 36F, the pseudo overtone generation processing may be performed in the subsequent stage of the IFFT unit 36G. Further, instead of the BPF 36I, only the data in the frequency band one octave below the crossover frequency may be extracted before the IFFT unit 36G.

  By the way, in a cartridge that is well-established for its high sound quality, a resonance frequency between the cartridge and the vinyl record board often exists in a high frequency band near 15 kHz to 20 kHz. In the resonance in the high frequency band at the resonance frequency, the record needle moves in a complicated manner, so that a very large amount of distortion occurs in the record needle.

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

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

  In the resonance frequency signal adding unit 38 according to the present embodiment, as a component of the resonance frequency, the component is applied in a pseudo manner as a triangular wave shown in FIG. 14 as an example. However, the present invention is not limited to this. For example, as an example, the sawtooth wave shown in FIGS. 15 and 16 may be applied in a pseudo manner as a component of the resonance frequency. Moreover, it is good also as a form which acquires the component by an actual resonant frequency previously and applies this component.

  In order to realize the function of adding the above-described resonance frequency component, the resonance frequency signal adding unit 38 according to the present embodiment includes a triangular wave generator 38A, a sound volume determination unit 38C, an attenuator 38D, and 2 as shown in FIG. Two superposition portions 38E and 38F are provided.

  As an example, the triangular wave generator 38A generates a triangular wave shown in FIG. 14 and outputs the triangular wave to the attenuator 38D by a conventionally known technique. Further, the sound volume determination unit 38C determines the sound volume of the left channel digital sound data L and the right channel digital sound 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. Furthermore, the superimposing unit 38E superimposes the triangular wave output from the attenuator 38D on the digital audio data L and outputs it. Similarly, the superimposing unit 38F superimposes the triangular wave output from the attenuator 38D on the digital audio data R and outputs it.

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

  The resonance frequency signal adding unit 38 attenuates the triangular wave generated by the triangular wave generator 38A by the attenuator 38D as the volume determined by the volume determination unit 38C decreases, and the superimposing unit 38E causes the digital audio data L to be attenuated. The superimposed triangular wave is output with being superimposed on the digital audio data R, and the attenuated triangular wave is superimposed on the digital audio data R and output.

  By the way, in recording sites such as music before the 1980s, a recording / reproducing apparatus using an open reel type magnetic tape is mainly used. In a sound source using the recording / reproducing apparatus, a hiss noise peculiar to a magnetic tape is generated. It was. On the other hand, in the case of digital audio recording media such as CD and SACD, hiss noise does not occur when the original recording is also performed digitally, and many users feel uncomfortable or unsatisfactory in this respect.

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

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

  The hiss sound 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 the present embodiment, hiss noise data is recorded in a silent state by a recording / reproducing apparatus using an actual open reel type magnetic tape, thereby digitally recording the reproduced sound of the analog signal recorded on the magnetic tape. Get by. The digital recording at this time is performed at a recording level using sampling of 176.4 (= 44.1 × 4) kHz as an example and using all of MSB (Most Significant Bit) as a 24-bit configuration.

  In addition, the gate unit 40B switches between the output and the output 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 / sound discriminator 40C discriminates a silence part and a sound part in the digital audio data L of the left channel and the digital audio data R of the right channel. Then, the silence / sound discriminator 40C sets the gate unit 40B to an open state to output hiss noise data when a voiced part is detected, while the gate unit 40B detects a silent part. Is closed and a control signal for not outputting hiss noise data is output to the gate unit 40B. It should be noted that the silence / sound discriminator 40C may be used to select in advance whether or not only the sound part is the target to which the hiss noise data is applied.

  Furthermore, the superimposing unit 40D superimposes the hiss noise data output from the gate unit 40B on the digital audio data L and outputs the result. Similarly, the superimposing unit 40E superimposes the hiss noise data output from the gate unit 40B on the digital audio data R and outputs it. In the present embodiment, the hiss noise data is superimposed near the LSB (Least Significant Bit) of each digital audio data of the left and right channels (specifically, in the case of 24-bit processing, LSB is included as an example). This is performed by adding up to the third bit retroactively from the LSB). In addition, the frequency band targeted at this time 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 unit 40, hiss noise data is output by the hiss sound generator 40A. Further, in the hiss noise adding unit 40, when the sound part in the digital audio data of the left and right channels is detected by the soundless / sound discriminator 40C, the hiss noise data is output by the gate part 40B and the silence part is detected. If it is, the output of hiss noise data is stopped at the gate unit 40B.

  The hiss noise adding unit 40 superimposes and outputs the hiss noise data on the digital audio data L by the superimposing unit 40D, while superimposing the hiss noise data on the digital audio data R by the superimposing unit 40E. Output.

  On the other hand, in general, in a record player, the resonance frequency on the low frequency band side often appears around 10 Hz due to the relative relationship between the arm and the cartridge in addition to the eccentricity and warpage of the vinyl record board. Noise (subsonic) is generated. On the other hand, in a digital audio recording medium such as a CD or SACD, there is no such resonance point. Therefore, a sound near 10 Hz is usually used except for a case where a musical instrument such as a large drum is recorded. There are many users who are not recorded and feel uncomfortable and unsatisfactory in this respect.

  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 subsonic components, the subsonic band adding unit 42 according to the present embodiment includes a subsonic data generator 42A and two overlapping units 42B and 42C as shown in FIG. I have.

  The subsonic data generator 42A generates and outputs digital audio data (hereinafter referred to as “subsonic data”) which is a subsonic component. In the present embodiment, digital audio data imitating the frequency of human α waves is applied as the subsonic data. The subsonic data applied here is not limited to imitating the frequency of α wave, but imitating human brain wave frequency such as β wave, or the first to third order of Schumann resonance similar to the brain wave. It is good also as a form which applies the signal of a frequency etc.

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

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

  By the way, as described above, in the vinyl record board, the left channel sound and the right channel sound are simultaneously recorded in one sound groove, and crosstalk occurs due to the mechanism of the cartridge. 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 regard.

  Therefore, the crosstalk adding unit 44 performs processing for adding a crosstalk component to the 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 components, the crosstalk adding unit 44 according to the present embodiment includes an LPF 44A for audio of the left channel, an attenuator 44B, and an HPF (High-High) as shown in FIG. 44C, and an attenuator 44D. The crosstalk adding unit 44 includes an LPF 44F for right channel audio, an attenuator 44G, an HPF 44H, and an attenuator 44I. Further, the crosstalk adding unit 44 includes two superimposing units 44E and 44J.

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

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

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

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

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

  The crosstalk adding unit 44 according to the present embodiment employs 100 Hz as the first frequency and 10 kHz as the second frequency when reproducing an actual vinyl record board at 100 Hz or less. This is because each frequency band of 10 kHz or more is a region where more crosstalk occurs. (In fact, although the level is low, cross-talk occurs in all frequency bands when playing vinyl records.)

  That is, the crosstalk adding unit 44 extracts and outputs only the data below the first frequency from the digital audio data L by the LPF 44A, and reduces the data output from the LPF 44A to the first amount by the attenuator 44B. To output. Further, the crosstalk adding unit 44 extracts and outputs only the data of the second frequency or higher from the digital audio data L by the HPF 44C, and reduces the data output from the HPF 44C to the second amount by the attenuator 44D. To output.

  On the other hand, the crosstalk adding unit 44 extracts and outputs only the data below the first frequency 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. To output. Further, the crosstalk adding unit 44 extracts and outputs only the data of the second frequency or higher from the digital audio data R by the HPF 44H, and reduces the data output from the HPF 44H to the second amount by the attenuator 44I. To output.

  In the crosstalk adding unit 44, 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 data. In the crosstalk adding unit 44, the superimposing unit 44J superimposes the data output from the attenuator 44B and the attenuator 44D on the digital audio data R and outputs the result.

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

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

  In order to realize a function of performing the above-described processing for emphasizing high frequency components (hereinafter referred to as “emphasis processing”) or attenuation processing (hereinafter referred to as “attenuation processing”), As shown in FIG. 21, the increase / decrease processing unit 46 includes an LPF 46A and an HPF 46B for the left channel audio, a frequency equalizer 46C, and a superimposing unit 46D. And the superimposition part 46H is provided.

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

  On the other hand, the LPF 46E extracts and outputs only data less than the third frequency from the digital audio data R of the right channel. Further, 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 predetermined enhancement amount or attenuates the digital audio data with the predetermined attenuation amount and outputs the digital audio data. 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 it.

  That is, the treble region volume increase / decrease processing unit 46 extracts and outputs only data less than the third frequency from the digital audio data L by the LPF 46A. 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 L by the HPF 46B. Further, in the treble region volume increase / decrease processing unit 46, the digital equalizer output from the HPF 46B is enhanced by the frequency equalizer 46C with the predetermined enhancement amount or attenuated with the predetermined attenuation amount. And output. In the treble region volume increase / decrease processing unit 46, the superimposing unit 46D superimposes the digital audio data output from the frequency equalizer 46C on the digital audio data output from the LPF 46A, and outputs it.

  On the other hand, the treble region volume increase / decrease processing unit 46 extracts and outputs only data less than the third frequency from the digital audio data R 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. Further, the treble region volume increase / decrease processing unit 46 emphasizes the digital audio data output from the HPF 46F by the frequency equalizer 46G with the predetermined enhancement amount or attenuates it with the predetermined attenuation amount. And output. Then, 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 it.

  In the DSP 28 according to the present embodiment, the CPU 21 sets driving / non-driving of each of the downshift processing unit 30, the dynamic range conversion unit 32, the phase conversion unit 34, and the high frequency band conversion unit 36 according to the designation by the user. Is done. In the DSP 28 according to the present embodiment, the CPU 21 causes the resonance frequency signal adding unit 38, the hiss noise adding unit 40, the subsonic band adding unit 42, the crosstalk adding unit 44, and the treble region volume increasing / decreasing process according to the designation by the user. Driving / non-driving of each part 46 is set. Note that in the DSP 28 according to the present embodiment, when the CPU 21 is set to be non-driven in each of the above-described units, the audio processing by itself is not performed, and the data input terminal and the data output corresponding to the data input terminal are not performed. Short-circuit the terminals. Hereinafter, 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 the audio processing unit designated by the user using digital audio data recorded on the recording medium 60 set in the optical drive 26. It has a sound playback function for performing sound playback in a state where In addition, the DSP 28 according to the present embodiment has a sound recording function for recording the digital sound data in the storage unit 23 in a state where sound processing by the sound processing unit designated by the user has been performed. . Hereinafter, the voice playback function and the voice recording function are collectively referred to as “voice playback / recording function”.

  Next, the operation of the audio reproducing / recording device 20 according to the present embodiment will be described. The user first sets a desired recording medium 60 in the optical drive 26 with respect to the audio reproducing / recording device 20. Then, the user causes the audio reproduction / recording apparatus 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 allowing 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 25 </ b> A that is designated when audio processing by the dynamic range conversion unit 32 is executed is displayed. In addition, in the initial setting screen, a “phase conversion” button 25 </ b> B specified when audio processing by the phase conversion unit 34 is executed and a “high frequency” specified when audio processing by the high frequency band conversion unit 36 is executed. "Band conversion" button 25C is displayed. In addition, in the initial setting screen, “Resonance frequency signal addition” button 25D designated when audio processing by the resonance frequency signal adding unit 38 is executed, and audio processing by the hiss noise adding unit 40 are designated “ "His noise addition" button 25E is displayed. In addition, on the initial setting screen, a “subsonic band addition” button 25 </ b> F designated when the audio processing by the subsonic band addition unit 42 is executed is displayed. Furthermore, in the initial setting screen, it is specified when the “crosstalk addition” button 25G specified when the audio processing by the crosstalk adding unit 44 is executed and when the audio processing by the treble region volume increase / decrease processing unit 46 is executed. The “high sound area 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 a button indicating one or a plurality of desired audio processes via the input unit 24, and then clicks a “designation end” button 25I. specify. Here, when the user designates the “treble area volume increase / decrease process” button 25H, the acquisition unit 11 pulls down an “attenuation process” button 25H1 and an “emphasis process” button 25H2, as shown in FIG. It displays on the display part 25 as a menu. When the pull-down menu is displayed, the user designates the “attenuation process” button 25H1 to execute the enhancement process when the attenuation process is performed by the treble region volume increase / decrease processing unit 46 via the input unit 24. In this case, the “enhancement processing” button 25H2 is designated. Note that the user designates an “end process” button 25J via the input unit 24 when ending the audio reproduction / recording process.

  When the “designation end” button 25I or “process end” button 25J on the initial setting screen is designated by the user, the above-described step 102 is affirmative and the process proceeds to step 104.

  In step 104, the processing unit 12 determines whether or not the button designated by the user is the “end processing” button 25J. If the determination is negative, the “end designation” button 25I is designated by the user. Therefore, 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 designated 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 a shift-down processing unit 30, a dynamic range conversion unit 32, and a phase conversion unit 34 to the DSP 28. Set to drive. Further, when all the buttons 25A to 25H are designated by the user, the processing unit 12 sets the DSP 28 so that all the 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 the signal input terminal and the signal output corresponding to the signal input terminal. The terminal is short-circuited. As a result, the DSP 28 is ready to drive only the part set to be driven by the processing unit 12.

  In the next step 108, the processing unit 12 determines whether or not the “high sound area volume increasing / decreasing process” button 25 </ b> H has been designated by the user, and if a negative determination is made, the process proceeds to step 116 described later, while an affirmative determination is made. If YES in step 110, the flow advances to step 110 to determine whether or not the user has designated the “attenuation process” button 25H1. If the determination is affirmative, the process proceeds to step 112, and 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 the determination is negative, the processing unit 12 regards that the “enhancement processing” button 25H2 has been designated by the user and proceeds to step 114, where the treble region volume increase / decrease processing unit 46 performs enhancement processing on the DSP 28. After setting 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 transmits the digital audio data read by the acquisition unit 11 to the DSP 28, and starts driving the audio processing unit set to be driven by the processing in step 106. To control. In the next step 120, the execution unit 13 controls the DSP 28 to start execution of the above-described audio reproduction / recording function, and then returns to step 102.

  On the other hand, if the determination in step 104 is affirmative, the processing unit 12 considers that the “process end” button 25J has been designated by the user, proceeds to step 122, executes a predetermined end process, The playback / recording process ends. In the audio reproduction / recording process according to the present embodiment, as the predetermined end process, various settings for the DSP 28 are canceled and the default state (in the present embodiment, all the audio processing units can be driven). Although the processing for stopping the driving of the DSP 28 is applied after the state is set to the above state, it is needless to say that the present invention is not limited to this.

  As described above in detail, in the present embodiment, digital audio data is acquired by the acquisition unit (in this embodiment, the acquisition unit 11). Further, in the present embodiment, the volume increasing process for increasing the volume as the value of the digital audio data increases with respect to the digital audio data acquired by the acquiring unit by the processing unit (in this embodiment, the processing unit 12). (In the present embodiment, audio processing by the dynamic range converter 32) is performed. In this embodiment, the execution unit (execution unit 13 in the present embodiment) performs at least one of reproduction and recording (both in the present embodiment) of digital audio data that has been subjected to volume increase processing by the processing unit. Execute. Therefore, according to the present embodiment, it is possible to more effectively modify the reproduced sound based on the digital audio data as compared with the case where the volume increasing process is not performed.

  In the present embodiment, as the volume increase processing by the processing unit, the volume increases as the maximum value (peak value in the present embodiment) of a series of digital audio data that has the immediately preceding reverse polarity in chronological order increases. We are processing to increase. Therefore, according to the present embodiment, when digital audio data is temporarily stored and volume increase processing is performed on the digital audio data, an increase in storage capacity for storing the digital audio data is suppressed, Volume increase processing can be performed in real time.

  In the present embodiment, the volume of the digital audio data is reduced by a predetermined value with respect to the digital audio data acquired by the acquisition unit prior to performing the volume increase process by the processing unit. 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 that may occur with the increase in volume due to the volume increase process.

  In the present embodiment, the processing unit further delays the phase of the digital audio data in a frequency band equal to or lower than a predetermined frequency band of the digital audio data from the phase of the frequency band higher than the frequency band ( In the present embodiment, audio processing by the phase conversion unit 34 is performed. Therefore, according to the present embodiment, it is possible to more effectively modify the reproduction sound based on the digital audio data.

  In the present embodiment, the processing unit further extracts first audio data from the digital audio data up to one octave below a predetermined crossover frequency, and the first audio data is extracted from the first audio data. Pseudo harmonic overtone generation processing is performed in which the frequency of one audio data is slightly more than twice. In the present embodiment, the processing unit performs a reduction process for reducing the amplitude of the second audio data obtained by performing the pseudo harmonic generation process by a predetermined amount. In the present embodiment, the processing unit adds the third audio data obtained by performing the reduction process to a band equal to or higher than the crossover frequency of the digital audio data (in this embodiment, the high frequency Audio processing by the band converting unit 36) is performed. Therefore, according to the present embodiment, it is possible to more effectively modify the reproduction sound based on the digital audio data.

  In the present embodiment, the processing unit further artificially adds a resonance frequency component between the cartridge and the vinyl record board to a high frequency band higher than a predetermined frequency of the digital audio data. (In this embodiment, sound processing by the resonance frequency signal adding unit 38) is performed. Therefore, according to the present embodiment, it is possible to more effectively modify the reproduction sound based on the digital audio data.

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

  In the present embodiment, the processing unit further performs processing for adding a subsonic component to the digital audio data (in this embodiment, audio processing by the subsonic band adding unit 42). Therefore, according to the present embodiment, it is possible to more effectively modify the reproduction sound based on the digital audio data.

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

  Further, in the present embodiment, the processing unit further performs processing for emphasizing a high frequency component higher than a predetermined frequency or processing for performing attenuation of the high frequency component on the digital audio data (this embodiment). Then, sound processing by the treble region volume increase / decrease processing unit 46 is performed. Therefore, according to the present embodiment, it is possible to more effectively modify the reproduction sound based on the digital audio data.

  In particular, in the present embodiment, a selection instruction indicating which process of enhancement and attenuation is applied is received, and either of the enhancement or attenuation process is performed by the processing unit according to the received selection instruction. Is done selectively. Therefore, according to the present embodiment, any one of the above enhancement and attenuation can be performed.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various changes or improvements can be added to the above-described embodiment without departing from the gist of the invention, and forms to which the changes or improvements are added are also included in the technical scope of the present invention.

  Further, the above embodiments do not limit the invention according to the claims (claims), and all combinations of features described in the embodiments are not necessarily essential to the solution means 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 constituent requirements are deleted from all the constituent requirements shown in the embodiment, as long as an effect is obtained, a configuration from which these some constituent requirements are deleted can be extracted as an invention.

  For example, in the above-described embodiment, the audio processing apparatus 10 has a function of reproducing digital audio data and a function of recording digital audio data after performing preset audio processing on the digital audio data. The case where 20 is applied has been described. However, the present invention is not limited to this, and for example, an audio reproduction device having only a function of reproducing digital audio data may be applied as the audio processing device 10. Moreover, it is good also as a form which applies the audio | voice recording apparatus which has only the function recorded after adding the audio | voice process preset to digital audio | voice data as the audio | voice processing apparatus 10. FIG.

  Moreover, although the said embodiment demonstrated the case where the various audio processing based on this invention was performed using DSP, this invention is not limited to this. For example, it may be configured to be executed by software, a combination of hardware and software, or only hardware.

  Moreover, although the said embodiment demonstrated the case where a user designates which attenuation | damping process and emphasis process are performed by the treble area volume increase / decrease processing part 46, this invention is not limited to this. For example, any one of the attenuation process and the enhancement process may be fixedly executed.

  In the above-described embodiment, the case where the processing by the downshift processing unit 30 is always executed when the audio processing by the dynamic range conversion unit 32 is executed has been described, 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.

  Also, 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.

  Moreover, although the said embodiment demonstrated the case where the audio | voice process in each site | part, such as the dynamic range conversion part 32 and the phase conversion part 34, was performed independently for every site | part, it 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 part may be prepared than in the above-described embodiment and shared by a plurality of parts.

  Moreover, although the said embodiment demonstrated the case where the audio | voice process in each site | part, such as the dynamic range conversion part 32 and the phase conversion part 34, was performed by digital signal processing, it is not limited to this. For example, the sound processing may be performed by analog signal processing for at least one part of each part.

  Moreover, although the said embodiment demonstrated the case where stereo audio | voice data was applied as digital audio | voice data of this invention, it 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 (see FIG. 2) of the audio playback / recording device 20 described in the above embodiment is an example, and unnecessary components are deleted or a new configuration is made without departing from the gist of the present invention. Needless to say, you can add elements.

  Furthermore, the flow of audio reproduction / recording processing (see FIG. 22) shown in the above embodiment 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.

DESCRIPTION OF SYMBOLS 10 Voice processing apparatus 11 Acquisition part 12 Processing part 13 Execution part 20 Voice reproduction | regeneration / recording apparatus 21 CPU
23 Storage Unit 23A Audio Playback / Recording Program 23A1 Acquisition Process 23A2 Processing Process 23A3 Execution Process 26 Optical Drive 28 DSP
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 Recording Medium

Claims (7)

An acquisition unit for acquiring digital audio data;
A processing unit that performs a volume increase process for increasing the volume as the value of the digital audio data increases with respect to the digital audio data acquired by the acquisition unit;
An execution unit that executes at least one of reproduction and recording of the digital audio data that has undergone the volume increase processing by the processing unit;
With
The said processing part performs the process which increases a volume, so that the maximum value of a series of digital audio | voice data made into the reverse polarity immediately before in the time series order becomes large as the said volume increase process. An acquisition unit for acquiring digital audio data;
A processing unit that performs a volume increase process for increasing the volume as the value of the digital audio data increases with respect to the digital audio data acquired by the acquisition unit;
An execution unit that executes at least one of reproduction and recording of the digital audio data that has been processed by the processing unit;
With
The processing unit further performs processing for delaying a phase of a band below a predetermined frequency band of the digital audio data from a phase of a frequency band higher than the band with respect to the digital audio data. An acquisition unit for acquiring digital audio data;
A processing unit that performs a volume increase process for increasing the volume as the value of the digital audio data increases with respect to the digital audio data acquired by the acquisition unit;
An execution unit that executes at least one of reproduction and recording of the digital audio data that has been processed by the processing unit;
With
The processing unit further extracts first audio data from the digital audio data up to one octave below a predetermined crossover frequency, and sets the frequency of the first audio data for the extracted first audio data. A pseudo harmonic overtone generation process is performed to make it slightly more than twice, a reduction process is performed to reduce the amplitude of the second audio data obtained thereby by a predetermined amount, and the third audio data obtained thereby is converted into the digital sound An audio processing apparatus that performs processing for adding to a band of audio data that is equal to or higher than the crossover frequency. An acquisition unit for acquiring digital audio data;
A processing unit that performs a volume increase process for increasing the volume as the value of the digital audio data increases with respect to the digital audio data acquired by the acquisition unit;
An execution unit that executes at least one of reproduction and recording of the digital audio data that has been processed by the processing unit;
With
In the case where the processing unit further reproduces the sound recorded on the vinyl record board using a cartridge provided with a record needle for a high frequency band higher than a predetermined frequency of the digital sound data, An audio processing device that performs a process of artificially adding a resonance frequency component between the cartridge and the vinyl record board. An acquisition unit for acquiring digital audio data;
A processing unit that performs a volume increase process for increasing the volume as the value of the digital audio data increases with respect to the digital audio data acquired by the acquisition unit;
An execution unit that executes at least one of reproduction and recording of the digital audio data that has been processed by the processing unit;
With
The processing unit further performs processing for adding a subsonic component to the digital audio data. An acquisition unit for acquiring digital audio data;
A processing unit that performs a volume increase process for increasing the volume as the value of the digital audio data increases with respect to the digital audio data acquired by the acquisition unit;
An execution unit that executes at least one of reproduction and recording of the digital audio data that has been processed by the processing unit;
With
The digital audio data is information indicating stereo audio,
The processing unit further performs processing for adding a crosstalk component to the digital audio data of the left and right channels in the digital audio data. An acquisition unit for acquiring digital audio data;
The digital audio data acquired by the acquisition unit is subjected to volume increase processing for increasing the volume as the value of the digital audio data increases, and the digital audio data is higher than a predetermined frequency. A processing unit that performs processing for emphasizing a high frequency component or processing for performing attenuation of the high frequency component;
An execution unit that executes at least one of reproduction and recording of the digital audio data that has been processed by the processing unit;
A reception unit that receives a selection instruction indicating which processing of the enhancement and the attenuation is applied;
With
The processing unit selectively performs either the enhancement or the attenuation processing according to a selection instruction received by the reception unit.

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