JP2014143509A - Portable reproducer and cradle device and voice reproduction system including them - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable reproducer capable of excellent voice reproduction regardless of whether or not the portable reproducer is connected with a cradle device, and to provide a cradle device and a voice reproduction system including them.SOLUTION: In a voice reproduction system, the recording section of a portable reproducer further records a second content having a title common to a first content recorded and different acoustic characteristics of audio signal. When a title common to the first and second contents is selected and reproduced in the selection instruction section of the portable reproducer, the portable reproducer reproduces the first content and outputs the first content from the output section of the portable reproducer if it is not connected with a cradle device, otherwise the portable reproducer reproduces the second content and outputs the second content from the voice reproduction section of the cradle device.

Description

  The present invention is an audio reproduction system including a portable reproduction device that reproduces a plurality of contents including an audio signal and a cradle device that reproduces audio, and particularly, when the portable reproduction device is not connected to the cradle device. The present invention relates to a portable playback device and a cradle device that can perform good audio playback regardless of connection, and an audio playback system including them.

  A portable playback device that plays back content including audio signals is mainly used with a headphone connected to it alone. In addition, the portable playback device is mounted on a cradle device that includes a speaker and is capable of audio playback. May be configured and used. In addition to a portable music player that does not have a built-in speaker, the portable playback device may be a mobile phone or the like (for example, Patent Document 1).

  On the other hand, the cradle device can have various configurations. The cradle device is not only a cradle that can charge a portable playback device, but also an audio device having an electroacoustic transducer such as a speaker that converts a sound signal into sound, or an electronic device such as a personal computer. In the case of a computer, there are, for example, Patent Document 2.

  The cradle device is recorded in the portable playback device regardless of whether or not the portion where the portable playback device of the cradle device is placed and connected is separated from the housing portion containing the speaker. An audio playback system that enables audio playback of a plurality of contents is configured. In this audio reproduction system, the user can reproduce the content recorded on the portable reproduction device from the speaker of the cradle device without using headphones.

  However, there are various configurations of the cradle device capable of reproducing sound as described above, and in some cases, even when configured as a sound reproducing system, appropriate sound reproduction may not be possible. In the sound reproduction system, it is preferable to introduce sound signal processing (for example, Patent Document 3) so as to complement the acoustic characteristics of the portable reproduction device and the cradle device and to have a sufficient sound pressure level in a wide band.

  However, if there is no audio signal processing circuit that performs audio signal processing such as an equalizer on the audio signal due to the configuration of the cradle device, the audio signal processing circuit of the portable playback device is connected to the sound of the audio playback unit of the cradle device. There is a problem that it must be readjusted according to the characteristics. In such a configuration, when the portable playback device is separated from the audio playback system and used alone, the audio signal processing circuit of the portable playback device is again readjusted to be suitable for use alone. There must be. That is, it is preferable to use an audio reproduction system that can perform good audio reproduction without a troublesome user operation related to correction of acoustic characteristics regardless of whether or not the portable reproduction apparatus is connected to the cradle apparatus.

International Publication No. 2007/086524 Japanese Patent No. 4654404 Special table 2008-541654

  The present invention has been made in order to solve the above-described problems of the prior art, and an object of the present invention is to perform good sound reproduction regardless of whether or not the portable playback device is connected to the cradle device. It is an object of the present invention to provide a portable reproduction device and a cradle device that can be used, and an audio reproduction system including them.

  An audio reproduction system of the present invention includes a recording unit that records a plurality of contents including an audio signal, a selection instruction unit that selects content to be reproduced, a connection unit that is connected to a cradle device, and an output unit that outputs an audio signal. A cradle device including at least a portable playback device including: a connection unit to which the portable playback device is connected; and an audio playback unit that converts an audio signal input from the connection unit into audio and plays back the audio signal. , Wherein the recording unit of the portable playback device further records the second content having the same title and different acoustic characteristics of the audio signal with respect to the recorded first content for portable playback. When a title common to the first content and the second content is selected in the selection instruction unit of the device and the content is played back, the portable playback device is When the portable playback device is not connected to the dollar device, the portable playback device plays back the first content and outputs the first content from the output unit of the portable playback device, and when the portable playback device is connected to the cradle device, Two contents are reproduced and output from the audio reproduction unit of the cradle device.

  Preferably, in the audio reproduction system of the present invention, the acoustic characteristic of the first content is set to a through state in which the transfer function is “1”, and the acoustic characteristic of the second content is corrected by the audio reproduction unit of the cradle device. A correction state that is a predetermined transfer function based on the characteristics is set.

  Preferably, in the audio playback system of the present invention, the recording unit of the portable playback device includes a first folder unit that stores a plurality of first contents, a second folder unit that stores a plurality of second contents, The selection instructing unit of the portable playback device displays a title common to the first content of the first folder unit and the second content of the second folder unit in a selectable manner.

  Preferably, in the audio reproduction system of the present invention, the cradle device further includes a calculation unit that calculates correction characteristics of the audio reproduction unit, and a measurement unit that acquires measurement data for calculating the correction characteristics, The measurement data includes a transfer function of the sound reproduction unit.

  The portable playback device of the present invention constitutes any one of the above-described audio playback systems.

  Further, the cradle device of the present invention constitutes any one of the above-described audio reproduction systems.

  The operation of the present invention will be described below.

  The audio reproduction system of the present invention includes a portable reproduction device and a cradle device. The portable playback device includes a recording unit that records a plurality of contents including an audio signal, a selection instruction unit that selects content to be played, a connection unit that is connected to the cradle device, an output unit that outputs an audio signal, At least. Further, the cradle device includes at least a connection unit to which the portable playback device is connected, and an audio playback unit that converts an audio signal input from the connection unit into a sound and plays it back. The portable playback device and the audio playback system can play back the content recorded in the recording unit by user operation.

  The recording unit of the portable playback device further records the second content having the same title and different acoustic characteristics of the audio signal with respect to the recorded first content. The selection instruction unit of the portable playback device can play back the content by selecting one title common to the first content and the second content. Therefore, when the portable playback device is not connected to the cradle device, the portable playback device can play back the first content and output it from the output unit of the portable playback device. When the portable playback device is connected to the cradle device, the portable playback device can play back the second content and output it from the sound playback unit of the cradle device.

  That is, in the audio reproduction system of the present invention, when the portable reproduction apparatus is not connected / connected to the cradle apparatus, at least two contents having the same title and different acoustic characteristics of the audio signal are reproduced in each case. By doing so, good audio reproduction can be achieved in any case. Preferably, the acoustic characteristic of the first content is set to a through state whose transfer function is “1”, and the acoustic characteristic of the second content is a predetermined transfer function based on the correction characteristic of the audio reproduction unit of the cradle device. What is necessary is just to set to a certain correction state. As a result, even when the cradle device does not have an audio signal processing circuit that performs audio signal processing on the audio signal, it is possible to configure an audio reproduction system that can perform good audio reproduction. In addition, even when the portable playback device is separated from the audio playback system and used alone, there is no need to readjust the audio signal processing circuit of the portable playback device so that it is suitable for use alone. There is.

  In the audio playback system of the present invention, the recording unit of the portable playback device includes a first folder unit that stores a plurality of first contents and a second folder unit that stores a plurality of second contents. The selection instruction unit of the portable playback device displays the title common to the first content of the first folder unit and the second content of the second folder unit so that the user can select the first content and the second content. It is possible to perform an operation such as playback / stop of the content without recognizing them separately. On the other hand, since the first content and the second content having different acoustic characteristics are stored in the first folder part and the second folder part, which are different from each other, in managing the contents, the acoustic characteristic is determined in units of folders. There is an advantage that it becomes easy to distinguish different contents. When there are a plurality of cradle devices, a plurality of second folder units corresponding to each of the cradle devices may be provided.

  In the sound reproduction system, the cradle device may further include a calculation unit that calculates the correction characteristic of the sound reproduction unit and a measurement unit that acquires measurement data for calculating the correction characteristic. Since the measurement data includes a plurality of transfer functions of the sound reproduction unit of the cradle device, good sound reproduction is possible when the portable reproduction device is connected to the cradle device.

  The audio reproduction system of the present invention enables good audio reproduction regardless of whether or not the portable reproduction apparatus is connected to the cradle apparatus, and the user distinguishes between the first content and the second content. Without recognizing, it is possible to perform operations such as content playback / stop.

It is a figure explaining the sound reproduction system 10 (when connecting the DAP apparatus 1 to the cradle apparatus 2) by preferable embodiment of this invention. Example 1 It is a figure explaining the sound reproduction system 10 (when not connecting the DAP apparatus 1 to the cradle apparatus 2) by preferable embodiment of this invention. Example 1 It is a graph explaining the acoustic characteristic (The through state whose transfer function is "1", or the correction state which is a predetermined transfer function) which corrects content. Example 1 It is a flowchart explaining operation | movement of the sound reproduction system 10 by preferable embodiment of this invention. Example 1

  Hereinafter, a portable playback device, a cradle device, and an audio playback system including these according to preferred embodiments of the present invention will be described, but the present invention is not limited to these embodiments.

  1 and 2 are diagrams for explaining a sound reproduction system 10 according to a preferred embodiment of the present invention. Specifically, FIG. 1 shows an acoustic reproduction system 10 when a DAP (Digital Audio Player) device 1 is connected to a cradle device 2. FIG. 2 shows a case where the DAP device 1 is not connected to the cradle device 2. FIG. 3 is a graph for explaining acoustic characteristics for correcting content. FIG. 4 is a flowchart for explaining the operation of the sound reproduction system 10. In addition, illustration and description are abbreviate | omitted about the one part structure unnecessary for description, an internal structure, etc.

  The sound playback system 10 is configured by connecting a DAP device 1 which is a portable music playback device to a cradle device 2. The user can reproduce the sound without using the headphones 5 by connecting the DAP device 1 that can be used alone with the headphones 5 to the cradle device 2 including the speakers 3 and capable of reproducing the sounds. The cradle device 2 of the present embodiment is realized by a PC (Personal Computer) having an audio function. The cradle device 2 can be connected to a microphone 4 used for correcting acoustic characteristics described later.

  The DAP device 1 includes an HDD (Hard Disk Drive) 12 in which a plurality of contents (including music contents, video contents, and others) including audio signals are recorded. The DAP device 1 includes an audio output circuit 13 and can output the content output from the HDD 12 from the connection connector 11 as an audio signal. The DAP device 1 includes a control circuit 16, and controls the operation of the DAP device 1 by a user operation operation signal from the operation circuit 14 and a control signal from the cradle device 2 received via the connection connector 11. The control circuit 16 displays the title of the content recorded in the HDD 12 on the display circuit 15 and selects the content to be played in response to a user operation from the operation circuit 14.

  The connection connector 11 of the DAP device 1 includes a connector for connecting a charging source to a rechargeable battery (not shown) of the DAP device 1 in addition to a connector for transmitting a plurality of control signals and a connector for outputting an audio signal. You can leave. The HDD 12 may be another semiconductor storage medium or the like, and the operation circuit 14 may be an input device such as a switch or a jog dial. The display circuit 15 may be a built-in FL display, liquid crystal display, or the like.

  The cradle device 2 receives a connection connector 21 to which the DAP device 1 is connected and an audio signal input from the connection connector 21 and converts the audio signal into a stereo audio signal (left audio signal, right audio signal). A preamplifier circuit 22 is provided. The amplifier circuit 23 amplifies the power of the audio signal and supplies it to the speaker 3, and converts the audio signal into audio and reproduces it. The preamplifier circuit 22 can adjust the volume of the audio signal input from the DAP device 1, and can also replace the test signal supplied from the test signal circuit 27, which will be described later, with an audio signal input from the DAP device 1. It can be output to the circuit 23.

  In addition, the cradle device 2 includes an operation circuit 24 that receives a user operation, a display circuit 25 that displays an operation state, and a control circuit 26 that controls the operation of the cradle device 2. The operation circuit 24 includes an input device such as a switch, a jog dial, or a remote control device. The display circuit 25 may be a built-in FL display, a liquid crystal display, or the like, or a display device connected to another. The control circuit 26 controls the operation of the audio reproduction system 10 together with the control circuit 16 of the DAP device 1 by the operation signal of the user operation from the operation circuit 24 and the control signal from the DAP device 1 received through the connection connector 21. .

  The cradle device 2 includes a test signal circuit 27, a microphone terminal M to which the microphone 4 is connected, and a microphone measurement circuit 28 that receives a measurement sound signal from the microphone terminal M and outputs a correction characteristic to be described later to the control circuit 26. The cradle device 2 may be constituted by other sound reproducing devices besides the PC. Note that the audio signal input from the DAP device 1 is not limited to the stereo signal, and may be a monaural signal, or may be a multi-channel surround signal when three or more speakers 3 are provided. . It can be configured by a DSP that supports multi-channel audio and an AV receiver that incorporates a multi-channel amplifier circuit. The microphone measurement circuit 28 does not necessarily have to be provided in the cradle device 2 and may be independent from the cradle device 2.

  The DAP device 1 and the audio reproduction system 10 can select and reproduce any one of a plurality of contents (C1, C2,...) Recorded on the HDD 12 of the DAP device 1 by a user operation. . A plurality of folders storing a plurality of contents are recorded on the HDD 12 of the DAP device 1. In this embodiment, in order to simplify the description, a case where two different folders 12A and 12B are set in the HDD 12 will be described. Each of the plurality of contents (C1, C2, C3,...) Has two content files in the folder 12A and the folder 12B having the same corresponding title and different acoustic characteristics of the audio signal. For example, regarding the content C1, a content file C1a whose content title is “C1” and a content file C1b whose content title is “C1” are recorded in the folder 12A, respectively. Regarding the content C2, a content file C2a whose content title is “C2” and a content file C2b whose content title is “C2” are recorded in the folder 12A, respectively. The same applies to contents C3 and below.

  FIG. 3 is a graph illustrating acoustic characteristics for correcting a plurality of contents (C1, C2, C3,...). More specifically, the horizontal axis represents the frequency, and the vertical axis represents the gain characteristic of the transfer function indicating the gain. In the case of “C_a” shown in the figure, the gain is 0 dB regardless of the frequency. This indicates that the transfer function of the acoustic characteristics common to the contents in the folder 12A is “1”. Therefore, in the case of “C_a” shown in the figure, the contents (C1a, C2a, C3a,...) In the folder 12A are recorded with the original audio signals of the contents in which no correction characteristics are convolved. Yes.

  On the other hand, in the case of “C_b” shown in the figure, the gain is 0 dB in the predetermined band below the frequency f0 shown in the figure, and in other cases, the gain is lowered to a predetermined level (about −3 to −12 dB). The gain increases in a predetermined band below the frequency f0. This indicates that the transfer function is in a correction state in which the transfer function is a predetermined transfer function with respect to the acoustic characteristics common to the contents in the folder 12B. The frequency f0 is the lowest resonance frequency of the speaker 3 of the cradle device 2, and substantially coincides with the lower limit frequency of the frequency band in which the speaker 3 can reproduce at a constant level. Therefore, in the case of “C_b” shown in the figure, it means a correction characteristic for correcting the acoustic characteristic of the speaker 3 of the cradle device 2 and is increased by relatively boosting a frequency below the lowest resonance frequency of the speaker 3 that tends to be insufficient. However, with respect to other bands, the gain is relatively lowered to prevent the waveform of the audio signal from being clipped. Each content (C1b, C2b, C3b,...) In the folder 12B is recorded with an audio signal of the content in which such correction characteristics are convoluted.

  Hereinafter, the operation of the sound reproduction system 10 will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, when the DAP device 1 is connected to the cradle device 2, the user can listen to the audio output of the content in the HDD 12 through the speaker 3 of the cradle device 2. As shown in FIG. 2, when the DAP device 1 is not connected to the cradle device 2, the user can listen to the audio output of the content in the HDD 12 by connecting the headphones 5 to the DAP device 1. In any case, the user can select and reproduce the title of the content recorded on the HDD 12 displayed on the display circuit 15 from the operation circuit 14 of the DAP device 1. In the illustrated example, the content C2 is selected. Here, the title of the content displayed on the display circuit 15 is a title (C1, C2, C3,...) Common to the two content files recorded in the folder 12A and the folder 12B, respectively. Therefore, the user can perform operations such as content reproduction / stopping without distinguishing between the content file stored in the folder 12A and the content file stored in the folder 12B.

  FIG. 4 is a flowchart for explaining the operation of the sound reproduction system 10. When reproducing the content, when the DAP device 1 is connected to the cradle device 2 (S1), the control circuit 16 of the DAP device 1 communicates with the control circuit of the cradle device 2, and the connected cradle device 2 It is determined whether or not the cradle device 2 is a target for correcting an audio signal (S2). When the DAP device 1 is not connected to the cradle device 2 and when the DAP device 1 is connected to a cradle device that is not a correction target (S2: No), the title of the content recorded in the HDD 12 is displayed on the display circuit 15 ( S3) When the user selects and reproduces the content, the control circuit 16 of the DAP device 1 reproduces the content file C_a stored in the folder 12A corresponding to the title common to the selected content (S3). S4). For example, when the title [C2] of the content displayed on the display circuit 15 is selected, reproduction of the content file C2a in the folder 12A is started. That is, when the DAP device 1 is used alone or when the DAP device 1 is connected to a cradle device that is not a correction target, the acoustic characteristic of the content is set to a through state whose transfer function is “1”.

  On the other hand, when the DAP device 1 is connected to the cradle device 2 to be corrected (S2: Yes), the title of the content recorded in the HDD 12 is displayed on the display circuit 15 (S5), and the user selects the content When reproducing the content file C_b, the control circuit 16 of the DAP device 1 reproduces the content file C_b stored in the folder 12B corresponding to the title common to the selected content (S6). For example, when the title [C2] of the content displayed on the display circuit 15 is selected, reproduction of the content file C2b in the folder 12B is started. That is, when the DAP device 1 is connected to the cradle device 2 to be corrected, the acoustic characteristic of the content is changed to a correction state in which the transfer function is a predetermined transfer function based on the correction characteristic of the speaker 3 of the cradle device 2. Set.

  Therefore, even when the DAP device 1 and the cradle device 2 according to the present embodiment do not have an audio signal processing circuit that performs audio signal processing on the audio signal of the content with a simple configuration, audio reproduction that enables satisfactory audio reproduction is possible. System 10 can be configured. Since the DAP device 1 displays the titles common to the content files in the folder 12A and the content files in the folder 12B in a selectable manner, the user can reproduce the content without distinguishing and recognizing these content files having different acoustic characteristics. Operations such as / stop can be performed.

  In addition, since it is determined whether or not the DAP device 1 is connected to the cradle device 2 to be corrected, even when the user separates the DAP device 1 from the sound reproduction system 10 and uses it alone, the DAP device 1 is renewed. There is an advantage that there is no need to readjust. On the other hand, since the content file C_a and the content file C_b having different acoustic characteristics are stored in different folders 12A and 12B, respectively, in managing the contents, the contents having different acoustic characteristics are distinguished for each folder. There is an advantage that it becomes easy to do. In order to cope with other (not shown) cradle devices having different acoustic characteristics, another folder 12C for storing the content file C_c having different acoustic characteristics may be provided in addition to the folder 12A and the folder 12B. If there are three or more corresponding cradle devices 2, the corresponding folders may be increased in the same manner.

  The cradle device 2 also includes a microphone measurement circuit 28 to which the test signal circuit 27 and the microphone 4 are connected. The test signal circuit 27 inputs a test signal to the preamplifier circuit 22. The microphone measurement circuit 28 includes an amplification stage that amplifies the input signal from the microphone 4, and an output circuit that calculates filtering and correction characteristics so as to output the output of the amplification stage to the control circuit 26.

  The test signal may be any test signal such as a noise signal such as white noise or pink noise having a predetermined frequency band component, a sweep signal for sweeping a pure tone, or an impulse signal. The measurement signal can be recorded as frequency data by arithmetic processing such as FFT. Therefore, the control circuit 26 of the cradle device 2 detects an audio signal detected from the microphone 4 in synchronization with the test signal generated from the test signal circuit 27 in the test signal output mode as a reproduction sound of the test signal, and the cradle It can be obtained as a transfer function of the speaker 3 of the device 2.

  The transfer function used for the correction may be based on an inverse function of the measured transfer function of the speaker 3, or may be an equalizer characteristic transfer function according to the inverse function of the transfer function. Of course, you may obtain the transfer function used for correction | amendment by the method of calculating the other conventional transfer function. If based on the transfer function obtained by arranging the microphones 4 at a plurality of measurement points, the acoustic power of the speaker 3 of the cradle device 2 can be corrected.

  The control circuit 26 of the cradle apparatus 2 obtains a content file in which the acoustic characteristics of the folder 12A of the HDD 12 of the DAP apparatus 1 are in the through state, and the audio signal is subjected to correction characteristics based on the measurement data although the title is common. Are recorded in a folder different from the folder 12A (for example, the folder 12B). As a result, when the DAP device 1 is connected to the cradle device 2 as shown in FIG. When the cradle device 2 has another recording medium such as an HDD controlled by the control circuit 26, a content file in which the acoustic characteristics of the folder 12A of the HDD 12 of the DAP device 1 are in the through state is transferred to this other content file. It is obtained by copying to a recording medium. Similarly, the title is common, but the correction characteristic based on the measurement data is recorded as another content file applied to the audio signal, and this is transferred to the HDD 12 of the DAP device 1. Also good.

  Of course, the DAP device 1 may be any portable electronic device such as a mobile phone, a notebook or tablet personal computer, and the cradle device 2 may be other than a PC having an audio function. A system in which a cradle such as a table and a speaker device are connected to a PC may be used. Of course, the cradle device 2 may be an AV (audio / video) device including the speaker 3. When the content recorded in the HDD 12 of the DAP device 1 is video content, a plurality of content files in which audio signals having different titles and video signals and different acoustic characteristics may be recorded.

  The portable playback device and cradle device of the present invention and the sound playback system including them are applicable not only to home personal computers and audio devices that play stereo audio signals, but also to sound playback systems including in-vehicle cradle devices. Is possible.

DESCRIPTION OF SYMBOLS 1 DAP apparatus 2 Cradle apparatus 3 Speaker 4 Microphone 5 Headphone 10 Sound reproduction system 11 Connection connector 12 HDD
13 audio output circuit 14 operation circuit 15 display circuit 16 control circuit 21 connection connector 22 preamplifier circuit 23 amplifier circuit 24 operation circuit 25 display circuit 26 control circuit 27 test signal circuit 28 microphone measurement circuit

Claims (6)

A portable device comprising at least a recording unit that records a plurality of contents including an audio signal, a selection instruction unit that selects the content to be reproduced, a connection unit that is connected to a cradle device, and an output unit that outputs the audio signal Mold reproducing device;
The cradle device including at least a connection unit to which the portable reproduction device is connected, and an audio reproduction unit that converts the audio signal input from the connection unit into audio and reproduces the audio;
An audio playback system comprising:
The recording unit of the portable playback device further records second content having a common title and different acoustic characteristics of the audio signal with respect to the recorded first content,
When selecting the title common to the first content and the second content in the selection instruction unit of the portable playback device and playing the content,
When the portable playback device is not connected to the cradle device, the portable playback device plays back the first content and outputs it from the output unit of the portable playback device,
When the portable playback device is connected to the cradle device, the portable playback device plays back the second content and outputs it from the audio playback unit of the cradle device;
Audio playback system. The acoustic characteristic of the first content is set to a through state whose transfer function is “1”,
The acoustic characteristic of the second content is set to a correction state that is a predetermined transfer function based on the correction characteristic of the audio reproduction unit of the cradle device.
The audio reproduction system according to claim 1. The recording unit of the portable playback device includes a first folder unit that stores a plurality of the first contents, and a second folder unit that stores a plurality of the second contents,
The selection instruction unit of the portable playback device displays the title common to the first content of the first folder unit and the second content of the second folder unit in a selectable manner;
The sound reproduction system according to claim 1 or 2. The cradle device further includes a calculation unit that calculates the correction characteristic of the sound reproduction unit, and a measurement unit that acquires measurement data for calculating the correction characteristic,
The measurement data includes a transfer function of the sound reproduction unit;
The audio reproduction system according to any one of claims 1 to 3.   A portable playback device constituting the sound playback system according to claim 1. The cradle apparatus which comprises the said audio | voice reproduction | regeneration system in any one of Claim 1 to 4.

Images