JP4579215B2 - Audio apparatus and sound quality correction method for audio apparatus - Google Patents

Description

  The present invention relates to an audio device and a sound quality correction method for an audio device, and more particularly to an audio device and a sound quality correction method for an audio device that can automatically reproduce auditory characteristics obtained in a certain reproduction space in different reproduction spaces.

  In recent years, the number of users who use portable audio devices has increased, and the use of portable audio devices connected to audio devices in the interior of automobiles (hereinafter also simply referred to as vehicle interiors) has increased. However, the situation is greatly different between, for example, a situation in which music is listened to by using an earphone, a headphone, or the like in a portable audio device, and a situation in which music is listened to through a speaker in the vehicle interior. Specifically, in the passenger compartment, the listening position is not even from the position of the left and right speakers, the sound of a specific frequency is absorbed by the seat and glass, or the sound of a specific frequency is difficult to hear due to road noise and engine noise. I will. On the other hand, an audio apparatus that stores music information and user equalizer (hereinafter also simply referred to as EQ) settings on a recording medium at the same time, and reproduces the EQ settings by referring to the EQ information on the reproducing side. Has been proposed (see, for example, Patent Document 1).

JP 2002-135900 A

  By the way, in the vehicle, the size and shape of the passenger compartment and the materials of various parts forming the passenger compartment differ depending on the vehicle type. In other words, because the sound field characteristics in the passenger compartment differ for each vehicle type, the proposed technology in Patent Document 1 tries to play back a portable audio device that stores an EQ setting optimized for a certain vehicle type with an in-vehicle system in another vehicle type. In such a case, the final audible characteristic that can be heard in the user's ear may be completely different from what the user desires.

  Therefore, the present invention has been made in view of the above problems, and provides an audio device and a sound quality correction method for an audio device that can automatically reproduce auditory characteristics obtained in a certain reproduction space in different reproduction spaces. Objective.

  In order to solve the above-described problem, the present invention provides an audio device provided in a second reproduction space, wherein the first equalizer characteristic when the sound quality is adjusted in the first reproduction space, and the first A reading unit that reads the first equalizer characteristic and the identification information from a recording medium in which the identification information corresponding to the reproduction space is stored, and the identification information that corresponds to the identification information that is read by the reading unit. From the identification means for identifying the first reproduction space and the first sound field characteristic corresponding to the first reproduction space identified by the identification means, a second sound field corresponding to the second reproduction space is obtained. Equalizer characteristic calculation means for calculating the second equalizer characteristic by combining the difference sound field characteristic and the first equalizer characteristic read by the reading means while calculating the difference sound field characteristic by differentiating the characteristics And Characterized in that it obtain. According to the present invention, auditory characteristics similar to those in the first reproduction space can be automatically reproduced in the second reproduction space. Thereby, the trouble of the sound quality adjustment concerning a user can be saved, and convenience is improved.

  The present invention is also an audio device provided in the second reproduction space, the first equalizer characteristic when the sound quality is adjusted in the first reproduction space, and the first according to the first reproduction space. Reading means for reading the reference characteristic from a recording medium in which a reference characteristic consisting of the sound field characteristic is stored, and a second sound corresponding to the second reproduction space from the reference characteristic read by the reading means Equalizer characteristic calculation means for calculating a second equalizer characteristic by differentiating the field characteristics is provided. According to the present invention, the same auditory characteristics as those in the first reproduction space can be automatically reproduced in the second reproduction space.

  According to the present invention, the sound field characteristic is stored in the recording medium, the reading unit reads the sound field characteristic from the recording medium, and the equalizer specifying calculation unit reads the sound read by the reading unit. The second equalizer characteristic may be calculated based on the field characteristic. Specifically, for example, as in the present invention, the sound field characteristics can be stored in a recording medium.

  In addition, the present invention further includes storage means for storing the sound field characteristics, and the equalizer characteristic calculation means calculates the second equalizer characteristics based on the sound field characteristics stored in the storage means. Good. For example, as in the present invention, the sound field characteristics can be stored in the storage means.

  In the present invention, the recording medium may be a recording medium included in a portable audio device. Specifically, the recording medium is preferably, for example, a recording medium included in portable audio devices whose number of users has increased in recent years.

  In the present invention, the reproduction space may be an automobile interior. Specifically, the reproduction space is preferably, for example, a vehicle interior.

  In the present invention, the first equalizer characteristic when the sound quality is adjusted in the first reproduction space and the identification information corresponding to the first reproduction space are stored in a recording medium, and the second reproduction space stores the identification information. When data is read from the recording medium, the first reproduction space corresponding to the identification information is identified from the identification information, and the second sound field characteristic is determined based on the first sound field characteristic corresponding to the first reproduction space. The difference sound field characteristic is calculated by subtracting the second sound field characteristic corresponding to the reproduction space, and the second equalizer characteristic is calculated by synthesizing the difference sound field characteristic and the first equalizer characteristic. A sound quality correction method for an audio apparatus, wherein the sound quality is corrected using the second equalizer characteristic.

  According to the present invention, a reference characteristic comprising a first equalizer characteristic when the sound quality is adjusted in the first reproduction space and a sound field characteristic corresponding to the first reproduction space is stored in the recording medium, and the second A second equalizer characteristic is calculated by subtracting a second sound field characteristic corresponding to the second reproduction space from the reference characteristic when data is read from the recording medium in the reproduction space. The sound quality correction method for an audio apparatus is characterized in that the sound quality is corrected with the equalizer characteristic of the audio device.

  According to the present invention, it is possible to provide an audio apparatus and a sound quality correction method for an audio apparatus that can automatically reproduce auditory characteristics obtained in a certain reproduction space in different reproduction spaces.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an in-vehicle audio apparatus (hereinafter simply referred to as an audio apparatus) 100A. The audio device 100 </ b> A includes a head unit 30 and a playback device 50. The head unit 30 is configured to integrally control the operation of the playback device 50 together with the operations of other devices connected to the head unit 30. Specifically, the configuration for the system controller 31 to perform such control. It has become. For example, a digital audio broadcast receiver, a CD changer, a DVD audio player, or the like can be connected to the head unit 30 as another device. The system controller 31 is connected to a GUI (Graphical User Interface) control unit 40 for sending a command corresponding to a user operation to the system controller 31. The head unit 30 includes an amplifier 33 inside. Audio signals from the playback device 50 and other devices are selectively input to the amplifier 33, and the input audio signals are output from the speaker 60 via the amplifier 33. The head unit 30 also includes a storage unit (storage unit) 32, and a vehicle type ID described later is stored in the storage unit 32. In the present embodiment, the head unit 30 includes the storage unit 32, but the playback device 50 may include the storage unit 32.

  A playback device 50 is connected to the head unit 30. The playback device 50 is configured to play back audio data compressed by a data compression technique such as MP3 format and recorded on a recording medium 10 such as a portable audio device, a memory card, or a CD-R. The playback device 50 includes a control system including an access control unit 51, a data extraction unit 52, a playback control unit 56, and an operation unit 55, a decoder 57, a sound quality adjustment unit 58, a D / A conversion unit 59, and a speaker 60. Audio signal system.

  The recording medium 10 includes an EQ setting (first equalizer characteristic) when the sound quality is adjusted in the cabin (first reproduction space) of another vehicle, and a vehicle type ID (identification information) corresponding to the vehicle type of the vehicle. And are saved. In this embodiment, the vehicle type ID is set for each type of vehicle. Specifically, the vehicle type ID is roughly set for each type such as a light vehicle, a compact car, a minivan, and the like. However, the present invention is not limited to this. For example, a vehicle type ID may be set for each vehicle name, and a vehicle type ID may be set for each grade in addition to the vehicle name. As a result, it is possible to more accurately grasp the sound field characteristics in the passenger compartment in which the EQ is set. The EQ setting and the vehicle type ID may be stored for each music piece or may be stored for each recording medium 10. In this embodiment, a plurality of sound field characteristics (first and second sound field characteristics) corresponding to the vehicle type ID are stored in the recording medium 10. These sound field characteristics can be obtained from a distribution website via the Internet using, for example, a personal computer.

  The access control unit (reading unit) 51 reads data recorded on the recording medium 10 such as a portable audio device, a memory card, or a CD-R based on a command from the reproduction control unit 56. The data extraction unit 52 extracts the EQ setting and the vehicle type ID from the data read by the access control unit 51. The data extraction unit 52 sends the extracted vehicle type ID to the vehicle type ID identification unit (identification unit) 53 and sends the extracted EQ setting to the EQ setting calculation unit (equalizer characteristic calculation unit) 54. The vehicle type ID identifying unit 53 identifies the vehicle type corresponding to the vehicle type ID. The identified vehicle type information is sent to the reproduction control unit 56, and under the control of the reproduction control unit 56, the access control unit 51 determines the sound field characteristics (first sound field) corresponding to the vehicle type identified by the vehicle type ID identification unit 53. Characteristic) and the sound field characteristic (second sound field characteristic) corresponding to the own vehicle are read from the recording medium 10 and sent to the EQ setting calculation unit 54 via the data extraction unit 52. The EQ setting calculation unit 54 calculates the differential sound field characteristic by subtracting the second sound field characteristic from the first sound field characteristic, and combines the differential sound field characteristic and the EQ setting extracted by the data extraction unit 52. Thus, a new EQ setting (second equalizer characteristic) is calculated. Further, the EQ setting calculation unit 54 sends the calculated new EQ setting to the reproduction control unit 56.

  The operation unit 55 sends a command corresponding to the user operation to the reproduction control unit 56. The playback control unit 56 controls the access control unit 51 and the data extraction unit 52 in accordance with a command sent from the GUI control unit 40 via the system controller 31 or a command sent from the operation unit 55, Processing such as sending new EQ settings sent from the EQ setting calculation unit 54 to the sound quality adjustment unit 58 is executed. Further, the reproduction control unit 56 stores the EQ setting made by the user in the storage unit 32 via the system controller 31. When the recording medium 10 is a writable medium, the vehicle type ID and the EQ setting stored in the storage unit 32 can be saved in the recording medium 10 by a user operation. At this time, the information stored in the storage unit 32 is read into the reproduction control unit 56 via the system controller 31, and the access control unit 51 is read into the reproduction control unit 56 under the control of the reproduction control unit 56. These pieces of information are written into the recording medium 10. Note that the vehicle type ID and the EQ setting may be automatically stored in the recording medium 10 regardless of the user operation. The decoder 57 decompresses the compressed audio signal read from the recording medium 10 and outputs it as a digital audio signal.

  The sound quality adjustment unit 58 is configured by a DSP (Digital Signal Processor), and includes a frequency decomposition unit 58a, mixers 58b, 58c, and 58f, a level correlation correction unit 58d, a time (phase) correlation correction unit 58e, and a frequency coupling unit 58g. ing. The frequency resolving unit 58a performs, for example, a fast Fourier transform on the digital audio signal, and converts the time domain signal into a frequency domain signal. The level correlation correction unit 58d, the time correlation correction unit 58e, and the mixers 58b, 58c, and 58f are based on the new EQ setting sent from the reproduction control unit 56, and relative to the frequency domain signal for each frequency band. Level correction (level correction for each frequency band) and relative phase correction (delay time correction for each frequency band). The corrected signal is converted into a time domain signal by the frequency coupling unit 58 g and output from the sound quality adjustment unit 58. The D / A converter 59 converts the digital audio signal output from the sound quality adjustment unit 58 into an analog audio signal, and the converted audio signal is output from the speaker 60 via the amplifier 33.

  FIG. 2 is a diagram schematically illustrating a sound quality correction method of the audio apparatus 100A according to the present embodiment. In FIG. 2, the audio device 100A is mounted on vehicles of vehicle types A and B, respectively. The user sets EQ so that the desired sound quality is obtained with the vehicle of vehicle type A. This EQ setting is stored in the storage unit 32 of the head unit 30. The vehicle type ID “A” and the EQ setting stored in the storage unit 32 are stored in the recording medium 10 of the portable audio device under a user operation. The recording medium 10 of the portable audio device stores a plurality of sound field characteristics corresponding to the vehicle type IDs in advance.

  Next, when driving the vehicle of the vehicle type B, the user uses the portable audio device connected to the audio device 100A mounted on the vehicle. At this time, the vehicle type ID is read from the recording medium 10 of the portable audio device, and the vehicle type ID stored in the recording medium 10 is identified as “A”. Simultaneously, the EQ setting is read from the recording medium 10, and the sound field characteristic corresponding to the vehicle type ID “A” and the sound field characteristic corresponding to the vehicle type ID “B” of the own vehicle are further read from the recording medium 10. After the EQ setting, the sound field characteristic corresponding to the vehicle type ID “A” and the sound field characteristic corresponding to the vehicle type ID “B” are read, the vehicle type ID “B” is obtained from the sound field characteristic corresponding to the vehicle type ID “A”. The difference sound field characteristic is calculated by subtracting the sound field characteristic corresponding to “,” and the difference sound field characteristic and the EQ setting are combined to calculate a new EQ setting. As a result, a sound whose sound quality has been adjusted with a new EQ setting is output from the speaker 60.

  2 corresponds to, for example, a case where a user owns a compact car corresponding to the vehicle type A for commuting and a minivan corresponding to the vehicle type B for family use on the weekend. In this case, once the EQ is set in the commuter car, the user can enjoy music with the same audibility characteristics even when he / she gets in the minivan with his / her family on the weekend. In other words, the user can obtain the same audibility characteristics as when listening to music in the vehicle interior of the vehicle type A in the vehicle interior of the vehicle type A without performing troublesome sound quality adjustment again, thereby improving convenience. As described above, the audio device 100A and the sound quality correction method of the audio device 100A that can automatically reproduce the auditory characteristics obtained in a certain reproduction space in different reproduction spaces can be realized.

  The audio device 100B according to the present embodiment is different from the audio device 100A according to the first embodiment in that the recording medium 10 in which the reference characteristics are stored is reproduced. The reference characteristic is formed by a sound field characteristic corresponding to the own vehicle and an EQ setting set by the user. The audio device 100Ba stores a sound field characteristic corresponding to the own vehicle in the storage unit 32. Therefore, the audio device 100Ba is in a state in which the reference characteristic is stored in the storage unit 32. Therefore, in the audio device 100Ba, the reference characteristic is stored in the storage medium 10 under a user operation.

  When the recording medium 10 in which the reference characteristics are stored in a certain car is played back by the audio device 100Ba mounted on a car of another vehicle type, the data extraction unit 52 is read by the access control unit 51 in the audio device 100Ba. It functions to extract reference characteristics from the data and send the extracted reference characteristics to the EQ setting calculation unit 54. At this time, the vehicle type ID identifying unit 53 becomes unnecessary. Further, the reproduction control unit 56 functions to read the sound field characteristic (second sound field characteristic) corresponding to the own vehicle from the storage unit 32 via the system controller 31 and send it to the EQ setting calculation unit 54. The EQ setting calculation unit 54 functions to calculate a new EQ setting (second equalizer characteristic) by subtracting the second sound field characteristic from the reference characteristic and send it to the reproduction control unit 56. Further, the reproduction control unit 56 sends a new EQ setting to the sound quality adjustment unit 58.

  On the other hand, even with the audio device 100Bb in which the sound field characteristics corresponding to the own vehicle are not stored in the storage unit 32, the recording medium 10 in which the reference characteristics are stored can be reproduced. In this case, in the audio device 100Bb, the data extraction unit 52 functions to extract the reference characteristic from the data read by the access control unit 51 and send the extracted reference characteristic to the EQ setting calculation unit 54. At this time, the vehicle type ID identifying unit 53 is similarly unnecessary. Further, the access control unit 51 reads the sound field characteristic (second sound field characteristic) corresponding to the own vehicle from the recording medium 10 under the control of the reproduction control unit 56, and the EQ setting calculation unit via the data extraction unit 52. 54 to function. That is, in this case, it is necessary to store a plurality of sound field characteristics corresponding to the vehicle type ID in the recording medium 10 in advance. The EQ setting calculation unit 54 functions to calculate a new EQ setting (second equalizer characteristic) by subtracting the second sound field characteristic from the reference characteristic and send it to the reproduction control unit 56. Further, the reproduction control unit 56 sends a new EQ setting to the sound quality adjustment unit 58.

  FIG. 3 is a diagram schematically illustrating the sound quality correction method of the audio apparatus 100B according to the present embodiment. FIG. 3 shows a sound quality correction method of the audio device 100B when the vehicle of the vehicle type A is equipped with the audio device 100Ba and the vehicle of the vehicle type B is equipped with the audio device 100Bb. The user sets EQ so that the desired sound quality is obtained with the vehicle of vehicle type A. This EQ setting is stored in the storage unit 32 of the head unit 30 as a reference characteristic together with a sound field characteristic corresponding to the own vehicle. The reference characteristics stored in the storage unit 32 are stored in the recording medium 10 of the portable audio device under a user operation. The recording medium 10 of the portable audio device stores a plurality of sound field characteristics corresponding to the vehicle type IDs in advance.

  Next, when driving the vehicle of the vehicle type B, the user uses the portable audio device connected to the audio device 100Bb mounted on the vehicle. At this time, the reference characteristic is read from the recording medium 10, and the sound field characteristic corresponding to the vehicle type ID “B” of the own vehicle is further read from the recording medium 10. After the sound field characteristics corresponding to the reference characteristics and the vehicle type ID “B” are read, a new EQ setting is calculated by subtracting the sound field characteristics corresponding to the vehicle type ID “B” from the reference characteristics. As a result, a sound whose sound quality has been adjusted with a new EQ setting is output from the speaker 60. As described above, it is possible to realize the audio device 100B and the sound quality correction method of the audio device 100B that can automatically reproduce auditory characteristics obtained in a certain reproduction space in different reproduction spaces.

  The embodiment described above is a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

It is a block diagram which shows the structure of 100 A of audio apparatuses. It is a figure which shows typically the sound quality correction method of 100 A of audio apparatuses. It is a figure which shows typically the sound quality correction method of the audio apparatus 100B.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Recording medium 30 Head unit 32 Memory | storage part 40 GUI control part 50 Playback apparatus 54 EQ setting calculation part 60 Speaker 100 Audio apparatus

Claims (8)

An audio device provided in the second reproduction space,
From the recording medium storing the first equalizer characteristic when the sound quality is adjusted in the first reproduction space and the identification information corresponding to the first reproduction space, the first equalizer characteristic and the identification information Reading means for reading
Identification means for identifying the first reproduction space corresponding to the identification information from the identification information read by the reading means;
The differential sound field characteristic is calculated by subtracting the second sound field characteristic corresponding to the second reproduction space from the first sound field characteristic corresponding to the first reproduction space identified by the identification means. An audio apparatus comprising: an equalizer characteristic calculating unit that calculates the second equalizer characteristic by combining the differential sound field characteristic and the first equalizer characteristic read by the reading unit. An audio device provided in the second reproduction space,
The reference characteristic is obtained from a recording medium in which a reference characteristic including a first equalizer characteristic when the sound quality is adjusted in the first reproduction space and a first sound field characteristic corresponding to the first reproduction space is stored. Reading means for reading
Equalizer characteristic calculation means for calculating a second equalizer characteristic by subtracting a second sound field characteristic corresponding to the second reproduction space from the reference characteristic read by the reading means. Audio device. The sound field characteristic is stored in the recording medium, and the reading unit reads the sound field characteristic from the recording medium, and the equalizer specifying calculation unit is based on the sound field characteristic read by the reading unit. The audio apparatus according to claim 1, wherein the second equalizer characteristic is calculated. And a storage means for storing the sound field characteristic, wherein the equalizer characteristic calculation means calculates a second equalizer characteristic based on the sound field characteristic stored in the storage means. The audio apparatus according to 1 or 2. The audio apparatus according to claim 1, wherein the recording medium is a recording medium included in a portable audio device. 6. The audio apparatus according to claim 1, wherein the reproduction space is an interior of a car. Storing a first equalizer characteristic when the sound quality is adjusted in the first reproduction space and identification information corresponding to the first reproduction space in a recording medium;
When reading data from the recording medium in the second reproduction space, the first reproduction space corresponding to the identification information is identified from the identification information, and the first sound corresponding to the first reproduction space is identified. The difference sound field characteristic is calculated by subtracting the second sound field characteristic corresponding to the second reproduction space from the field characteristic, and the difference sound field characteristic and the first equalizer characteristic are combined to calculate the difference sound field characteristic. 2. A sound quality correction method for an audio device, comprising: calculating an equalizer characteristic of 2 and correcting the sound quality with the second equalizer characteristic. A reference characteristic comprising a first equalizer characteristic when the sound quality is adjusted in the first reproduction space and a sound field characteristic corresponding to the first reproduction space is stored in a recording medium;
When reading data from the recording medium in the second reproduction space, a second equalizer characteristic is calculated by subtracting a second sound field characteristic corresponding to the second reproduction space from the reference characteristic, A sound quality correction method for an audio device, wherein the sound quality is corrected with a second equalizer characteristic.

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