JP2014154176A - Audio reproduction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an audio reproduction device having a resume reproduction function which prevents a user from feeling uncomfortable sound and sound skipping even when memory recording processing cannot be correctly performed.SOLUTION: An audio reproduction device includes: a memory 113 in which a part corresponding to a prescribed time length, of sound data recorded in a disk-type recording medium is recorded; a memory recording control/content confirmation unit 106 which controls recording of the sound data into the memory and localizes breakdown of sound data recorded in the memory; a memory reproduction control unit 105 which controls reproduction of the sound data recorded in the memory; a disk-type recording medium/memory switching control unit 103 which switches reproduction from the memory to reproduction from the disk-type recording medium; a memory management information acquisition unit 107 which acquires management information of sound data normally stored after the localized breakdown of the sound data in the memory; and a display control unit 108 which controls display of a start animation to be displayed on a display 112 when a power source is turned on, on the basis of the management information.

Description

  The present invention relates to an audio playback device that plays back audio data recorded on a disk-type recording medium, and more particularly to an audio playback device that can perform resume playback.

  In-vehicle audio playback devices usually stop the vehicle engine (accessory power OFF: ACC OFF), and after a while, start the engine from the final mode when ACC is OFF (accessory power ON: ACC ON). . At this time, if the final mode is a CD (Compact Disk) mode, so-called resume playback is performed in which a playback operation is started from the playback location when ACC is OFF. However, when starting from the CD mode, it takes time until the CD deck head rotation speed reaches a certain speed, and the head position is adjusted to the final playback position. As a result, it takes time until sound is output. There is.

  In Patent Document 1 below, when ACC is OFF, sound data for several seconds from the current playback position is stored in the memory, and when the ACC is ON, the data stored in the memory is decoded and played, and the CD is driven during that time. Has increased the sound output time by switching the data read from the CD to the decoded sound.

JP 2005-293784 A

  However, in the above prior art, when data is stored in the memory when ACC is OFF, there is a possibility that the data is destroyed for some reason or cannot be stored in the memory correctly. In that case, if the data destruction area on the memory is decoded and reproduced when the ACC is ON, an abnormal sound is generated.

  The present invention solves the above-described conventional problem. When there is a region where abnormal data exists, the startup time of the startup animation is adjusted, and the time until switching from the memory playback to the CD playback is earned to acquire the abnormal data. It is an object of the present invention to provide an audio reproducing apparatus that avoids the reproduction of sound and does not sound abnormal sounds or cause sound interruption.

In order to achieve the above object, an audio reproducing apparatus of the present invention includes a decoding processing unit that decodes audio data recorded on a disk type recording medium, a DA converter unit that converts the decoded signal into an analog signal, and a disk type A reproduction control unit for performing reproduction control of the recording medium, a memory for recording audio data recorded on the disc type recording medium for a predetermined time, and audio data recorded in the memory for controlling recording of the audio data in the memory A memory recording control / content confirmation unit for specifying the destruction location of the memory, a memory reproduction control unit for controlling the reproduction of the audio data recorded in the memory, and a disk type recording medium for switching the memory reproduction to the reproduction of the disk type recording medium / Management information of audio data normally saved from the memory switching control unit and the audio data destruction location in the specified memory Comprising a memory management information acquisition section which acquires, and a display control unit for controlling the display of activation animation to be displayed on at a display power ON based on the management information.

  The management information includes volume information of audio data normally stored in the memory, and the display control unit calculates the playback speed of the startup animation based on the volume information, and plays back the startup animation at the playback speed.

  According to the present invention, even if the memory recording process cannot be performed correctly in the audio playback device, the display of the startup animation is controlled to adjust the memory playback time, so that the user can hear an unpleasant sound or sound interruption. It can be made not to feel.

Block diagram of an audio playback apparatus in an embodiment of the present invention The flowchart which shows the flow of a display process of the starting animation of the signal processing part 100 Schematic diagram showing the flow of startup when the audio data stored on the memory 113 is stored normally and when a part thereof is destroyed

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiment of the present invention described below shows a preferred specific example of the present invention. The numerical values, shapes, components, arrangement of components, connection forms, and the like shown in this embodiment are merely examples, and are not intended to limit the present invention. The invention is limited only by the claims. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims are not necessarily required to achieve the object of the present invention, but are described as constituting more preferable embodiments. The

  FIG. 1 is a block diagram of an audio playback apparatus according to an embodiment of the present invention. In the present embodiment, the audio playback device is for in-vehicle use, and the state where the accessory power of the vehicle is turned off is called ACC OFF, and the state where the accessory power is turned on is called ACC ON.

  In FIG. 1, an audio playback apparatus 10 outputs a signal processing unit 100 including hardware such as an audio microcomputer, a CPU, and a display microcomputer and software executed on the hardware, a CD deck 109 connected thereto, and outputs sound. Non-volatile memory for storing a part of audio data read from a CD (Compact Disk) for resume reproduction, a speaker 110 for performing operation, a key switch 111 for operation, a display 112 for displaying various information such as a start animation 113 and a startup animation storage memory 114 configured by a ROM or the like for storing startup animation data.

  In the audio microcomputer, the audio data recorded on the CD inserted in the CD deck 109 is decoded by the decode processing unit 101, and after the digital signal is converted into an analog signal by the DA converter unit 102, the audio is listened to. The sound is output from the speaker 110 for the purpose.

  The CD playback control unit 104 manages CD information (playback time, title name, etc.) and controls CD playback.

In the resume playback process of the CD, the memory recording control / content confirmation unit 106 records the audio data recorded on the CD for a predetermined time in the memory 113, and the memory playback control unit 105 stores the memory 113 when the ACC is ON. The audio data is played back. After the ACC is turned on, after the CD deck 109 is driven, the CD / memory switching control unit 103 performs a process of switching from memory playback to CD playback.

  As will be described later, the memory recording control / content confirmation unit 106 also performs a content confirmation process of identifying the location where the audio data stored in the memory 113 is destroyed and recording the address of the abnormal data area.

  Next, the display microcomputer will be described. The memory management information acquisition unit 107 obtains management information such as the address and capacity of the audio data area normally stored on the memory 113 from the address of the abnormal data area specified by the memory recording control / content confirmation unit 106. get. The display control unit 108 reads the startup animation data from the startup animation storage memory 114 and causes the display 112 to display the startup animation that is display-controlled based on the management information acquired by the memory management information acquisition unit 107.

  Regarding the signal processing unit 100 of the audio playback device 10 configured as described above, a processing operation for displaying a startup animation will be described below. FIG. 2 is a flowchart showing a flow of display processing of the startup animation of the signal processing unit 100 in the embodiment of the present invention.

  First, the memory recording control / content confirmation unit 106 checks whether the audio data stored in the memory 113 is normal (step S201). Here, a checksum, CRC, or the like can be used as a data check method.

  If abnormal data is not detected in the check process in step S201 (No), that is, if all audio data stored in the memory 113 is normal, resume playback for a preset storage capacity is possible. Therefore, the display control unit 108 sets the playback speed of the startup animation to a normal playback speed (step S202).

  On the other hand, if abnormal data is detected (Yes in step S201), the memory recording control / content confirmation unit 106 records the address of the detected abnormal data area (step 205). In the case where there are a plurality of abnormal data, similarly, the address of the area is recorded for the first abnormal data.

  Next, the memory management information acquisition unit 107 acquires management information such as the address and capacity of the normally stored audio data from the address of the abnormal data area identified by the memory recording control / content confirmation unit 106. (Step S206).

  Then, the display control unit 108 calculates and sets the playback speed of the startup animation from the volume of the audio data normally stored in the memory 113 using the following equation.

  Next, the display control unit 108 reads the activation animation data from the activation animation storage memory 114 (step S203), reproduces the read activation animation data at the set reproduction speed (step S204), and ends the process. .

  FIG. 3 is a diagram schematically showing the flow at the time of startup when the audio data stored on the memory 113 is normally stored and when a part thereof is destroyed.

(1) When audio data can be stored normally in the memory (No in step S201 in FIG. 2)
Since all the audio data is stored correctly, MEM_SV / MEM_ALL = 1 in (Equation 1), and the playback speed is
Fin_fps = 2 × Def_fps
become. The playback speed of the normal startup animation set in step S202 of FIG. 2 is this value. Here, for example, if the default startup animation playback speed Def_fps = 60 fps is set, Fin_fps = 120 fps. That is, if all the audio data is stored correctly, the user can be given an image in which the startup animation is played back earlier than in the default operation.

  When the reproduction of the start animation is finished, the memory reproduction control unit 105 reproduces the audio data read from the memory 113. Meanwhile, the CD reproduction control unit 104 starts moving the optical pickup position of the CD deck 109 to the reproduction position of the audio data on the CD following the audio data stored in the memory 113. When the optical pickup comes to a predetermined reproduction position while the memory reproduction control unit 105 is reproducing the audio data in the memory 113, the CD / memory switching control unit 103 instructs the CD reproduction control unit 104 to store the audio data in the memory 113. Until the reproduction is completed, the optical pickup is made to stand by at the reproduction position to prepare for reproduction of audio data from the CD. When the memory playback control unit 105 completes playback, the CD / memory switching control unit 103 causes the CD playback control unit 104 to start playback of audio data from the CD.

(2) When the latter half of the audio data in the memory is destroyed (Yes in step S201 in FIG. 2)
The time required for the CD playback control unit 104 to move the optical pickup position of the CD deck 109 to a predetermined playback position is substantially the same as in the case of (1). For this reason, it is necessary to lengthen the playback time of the startup animation by the amount of time that the audio data is played back from the memory 113 due to data destruction. Here, the reproduction speed is calculated by (Equation 1).

For example, if data destruction occurs in the middle of the audio data from the beginning, the memory capacity (MEM_SV) of the non-destructed area is half of the memory capacity (MEM_ALL), so MEM_SV / MEM_ALL = 0.5. The playback speed of the startup animation is (Equation 1)
Fin_fps = 1.5 × Def_fps
become. Here, if the default startup animation playback speed Def_fps = 60 fps, Fin_fps = 90 fps. Then, the display control unit 108 acquires the data of the startup animation from the startup animation storage memory 114 and plays it back at the playback speed calculated by (Equation 1). Meanwhile, the CD playback control unit 104 starts moving the optical pickup position of the CD deck 109 to the playback position of the music data on the CD following the audio data normally stored in the memory 113. When the reproduction of the start animation is finished, the memory reproduction control unit 105 reproduces the normal part of the audio data read from the memory 113.

When the optical pickup comes to a predetermined reproduction position while the memory reproduction control unit 105 reproduces the audio data in the memory 113, the CD / memory switching control unit 103 instructs the CD reproduction control unit 104 to perform a normal part of the memory 113. Until the reproduction of the audio data is completed, the optical pickup is made to stand by at the reproduction position to prepare for reproduction of the audio data from the CD. When the memory playback control unit 105 completes playback, the CD / memory switching control unit 103 causes the CD playback control unit 104 to start playback of audio data from the CD.

(3) When the middle of the audio data in the memory is destroyed (Yes in step S201)
In this case, the first part and the last part of the audio data are normally stored in the memory 113. However, since the sound that can be reproduced even if the abnormal data is skipped and reproduced, the sound skips. Thus, only the first part can be effectively reproduced from the memory 113. The memory management information acquisition unit 107 acquires management information such as the address and capacity of the area of the first portion of audio data that is normally stored. The display control unit 108 calculates the playback speed of the startup animation according to (Equation 1) from the capacity of the first part of the audio data area that is normally stored and acquired by the memory management information acquisition unit 107. The subsequent flow is the same as (2).

(4) When the first half of the audio data in the memory is destroyed (Yes in step S201)
In this case, since the first part of the audio data becomes abnormal data, even if there is an area stored normally in the second half part, it cannot be reproduced from the reproduction position before ACC OFF, and as a result, the resume reproduction function is provided. It will be lost. Therefore, only abnormal data exists, and MEM_SV = 0, so MEM_SV / MEM_ALL = 0. Therefore, the playback speed of the startup animation is (Equation 1)
Fin_fps = 1 × Def_fps
become. Here, if the default startup animation playback speed Def_fps = 60 fps is set, Fin_fps = 60 fps. That is, even in the worst case where the audio data is abnormal data from the first half and there is no audio data that can be reproduced from the memory 113, the startup animation gives the user an image reproduced at a speed that is reproduced in a mode other than the CD mode. be able to.

  Therefore, in the audio playback device according to the present embodiment, even if the memory recording process cannot be performed correctly when ACC is OFF, the operation of the startup animation is controlled and the memory playback time is adjusted, so that the user is uncomfortable. And it can be made not to feel the sound cut.

  As described above, according to the audio playback device of the present embodiment, even when the memory recording process cannot be performed correctly, by controlling the display of the startup animation and adjusting the memory playback time, the user can It is possible to prevent the user from feeling uncomfortable noise or sound interruption.

  In the above embodiment, the display control unit 108 changes the playback speed of the start animation data based on the volume of the audio data normally recorded in the memory 113. The activation animation data may be stored in the activation animation storage memory 114, and the display control unit 108 may select and reproduce appropriate activation animation data from the data. In this case, the display control unit 108 calculates the playback time of the startup animation based on the volume of audio data normally recorded in the memory 113, and obtains the startup animation data corresponding to the playback time from the startup animation storage memory 114. select.

  In the present embodiment, the CD has been described. However, the present invention is not limited to the CD. In addition to CD, in a disk type recording medium such as MD (Mini Disk), DVD (Digital Versatile Disk), BD (Blu-ray Disk), and HD (Hard Disk) that mechanically rotates a disk as a recording medium. , Takes a long time to start. The present invention can also be applied to these disk-type recording media when the resume function is installed.

  The audio playback device of the present invention is used by being mounted on a moving body such as a vehicle, and is useful as a playback device for music media such as a CD.

DESCRIPTION OF SYMBOLS 10 Audio reproduction apparatus 100 Signal processing part 101 Decoding process part 102 DA converter part 103 CD / memory switching control part 104 CD reproduction control part 105 Memory reproduction control part 106 Memory recording control / content confirmation part 107 Memory management information acquisition part 108 Display control 109 CD deck 110 Speaker 111 Key switch 112 Display 113 Memory 114 Startup animation storage memory

Claims (2)

A decoding processing unit that decodes audio data recorded on a disc type recording medium; a DA converter unit that converts the decoded signal into an analog signal; a reproduction control unit that controls reproduction of the disc type recording medium; Memory for recording audio data recorded on a disk-type recording medium for a predetermined time, and memory recording control / content for controlling recording of the audio data in the memory and identifying a location where the audio data recorded in the memory is destroyed A confirmation unit; a memory playback control unit that controls playback of audio data recorded in the memory; a disk type recording medium / memory switching control unit that switches the memory playback to playback of a disk type recording medium; Memory management information acquisition unit that acquires management information of audio data that is normally stored from the location where the audio data in the memory is destroyed , Audio playback apparatus and a display control unit for controlling the display of activation animation to be displayed when the power is turned ON the display on the basis of the management information. The management information includes volume information of audio data normally stored in a memory, and the display control unit calculates a playback speed of the startup animation based on the capacity information, and plays the startup animation at the playback speed. The audio reproducing apparatus according to claim 1, wherein

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