JP2000200465A - Audio signal processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of head cutting by returning to a first reproduction starting position again after switching a decoding form of a DSP into a decoding form corresponding to an encoding form of a detected reading data signal thereby reproducing audio signal. SOLUTION: Both of a receiver 11 of an AV system 10 and a source appliance 12 are provided with host microcomputers 13, 14, and a code is mutually freely transmitted and received by both host microcomputers. An encoding form is detected by the host microcomputer 14 of the source appliance 12 from a reading data signal, detected audio recording data are imparted to the host microcomputer 13 of the receiver 11, and a decoding form of a DSP is switched into a decoding form corresponding to the informed encoding form. Next, mutes of a speaker and a monitor are released, the information that switching is finished is imparted from the host microcomputer 13 of the receiver 11 to the host microcomputer 14 of the source appliance 12, and the source appliance 12 returns to a first reproduction starting position to start reproduction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an audio signal processing device for reproducing an audio recording medium such as a DVD, and more particularly, to automatically decode a corresponding decoding format according to an encoding format of audio recording data in the audio recording medium. The present invention relates to an audio signal processing device to be selected.

[0002]

2. Description of the Related Art The encoding format of audio recording data in DVDs and VCDs is PCM, DTS, M
There are various types such as PEG and AC-3, and when reproducing audio, it is necessary to decode the audio in a decoding format suitable for the encoding format.

In order to automatically set the decoding format of a conventional audio signal processing device, audio recording data on an optical disk is read in response to a reproduction instruction, and the audio recording data encoding format of the read data signal is read out. Is detected, and the decoding format in the decoder is switched to a decoding format corresponding to the encoding format.

[0004]

In the conventional audio signal processing device, after the reproduction is started, the encoding format of the audio recording data is detected, and the decoding format corresponding to the detected encoding format is switched to the decoding format of the decoder. It takes a long time to start decoding, and the reproduction of the audio sound in the early stage of reproduction cannot be made in time, that is, there is a so-called truncation problem. If the user manually sets the decoding format of the decoder before the reproduction instruction, it takes time to check the encoding format of the optical disc to be reproduced.

It is an object of the present invention to provide an audio signal processing device which overcomes the above-mentioned problems.

[0006]

The audio signal processing device (10) of the present invention has the following (a) to (d). (A) an audio recording data reading unit which can read audio recording data recorded on the set audio recording medium (11) (b) a first reproduction start position as a reproduction start position of the reproduction instruction based on the reproduction instruction From the audio recording data reading unit (11) in the audio recording data reading unit (11) in the audio recording data reading unit (11) in the playback progress direction, and then detecting the encoding format of the read data signal from the reading data signal. Means (14) (c) After the encoding format detecting means (14) detects the encoding format, the audio recording data reading section (11) is again provided in the audio recording data reading section (11) from the first reproduction start position in the reproduction progress direction. And reads the read data signal according to the encoding format detected by the encoding format detecting means (14). Decoding means for decoding at the decoding format (20) (d) reproduced sound signal generating means for generating a reproduced sound signal as an electric signal before conversion to sound based on the output of the decoding means (20) (20)

Audio recording media include DVD and CVD.
In addition to the optical disks such as, an audio recording medium (eg, tape) other than the optical disks is included. The audio recording medium may be (a) a medium in which video data is not recorded and only audio data is recorded, or (b) a medium in which video data is recorded together with audio data. Good. Therefore, even if the audio signal processing device (10) is applied as a part in an audio system, the audio signal processing device (AV) (AV) can be used.
It may be applied as part of the system. To play,
This includes both the case of reproduction alone and the case of reproduction for recording such as dubbing. That is, reproduced sound signal generation means
The reproduced sound signal generated in (20) is not limited to being output to a sound output unit such as a speaker, but may be output to a recorder, a recorder including a recording unit, or the like.

As described above, the audio recording data reading section (11) detects the encoding format of the read data signal from the read data signal generated by reading the audio recording data from the audio recording medium, and corresponds to the encoding format. After the decoding format of the decoding means (20) is switched to the decoding format of (1), the audio is reproduced again by returning to the first reproduction start position. Can be played back from the playback start position.

An audio signal processing device (10) according to the present invention.
Has a mute means for muting the output of the reproduced sound from the time of the reproduction instruction to the start of decoding by the decoding means (20).

By muting, unnecessary sound can be prevented from being output to a sound output means such as a speaker or a recording unit. When the audio signal processing device (10) is applied as a part of an AV system, it is preferable to mute the video output while muting the audio output (preferably, the monitor is muted during muting). "Mute in progress" is displayed.), And mute of the video is not limited.

The audio signal processing device (10) of the present invention has the following (a) to (f). (A) When an audio recording medium is set, the audio recording data reading unit (1) reads out the TOC information for the audio recording medium and allows the audio recording data of the audio recording medium to be freely read during the setting.
1) (b) Encoding format detecting means (14) (14) for detecting the encoding format of the read data signal from the read data signal generated by reading the audio recording data of the audio recording medium being set by the audio recording data reading section (11). c) Set audio recording data reading section (11)
For reading TOC information and encoding format detection
For the audio recording medium for which the encoding format has been detected by (14), storage means for storing the TOC information and the encoding format in association with each other even after unsetting. (D) The audio recording data reading unit (11) performs audio recording. Encoding format detecting means for detecting whether or not the TOC information read from the medium is included in the TOC information stored in the storage means, and detecting an encoding format associated with the TOC information if the TOC information is present (e). Decoding means (20) (20) for decoding a read data signal of the audio recording data reading section (11) in a decoding format corresponding to the encoding format detected by the encoding format detecting device in response to a reproduction instruction for the audio recording medium being set. f) generating a reproduced sound signal as an electric signal before conversion into sound based on the output of the decoding means (20); It reproduced sound signal generating means for (20)

Thus, once set, the TOC
For the audio recording medium in which the information and the encoding format are stored in the storage device in association with each other, at the next setting, the encoding format is obtained based on the storage in the storage device, and is decoded to the decoding format corresponding to the encoding format. Since the decoding format of the means (20) is set and the reproduction is performed, the reproduction can be performed while avoiding a break in the beginning.

An audio signal processing device (10) according to the present invention.
When the audio recording medium is set, the audio recording data reading unit (1
The TOC information read in 1) is stored in the TO
If it is detected as C information, the encoding format of the audio recording data of the audio recording medium is detected by the encoding format detecting means (14), and the TOC information and the encoding format of the audio recording medium are detected. There is a storage instructing means for storing the data in the storage means in association with each other.

Whether the TOC information read by the audio recording data reading section (11) is present in the TOC information stored in the storage means is checked or not. This is the case where the audio recording medium set this time in (1) has never been set in the audio signal processing device (10) in the past, and this setting is the first time. Also, the storage capacity of the storage means is limited, and in order to give priority to the storage of the TOC information and the encoding format of the audio recording medium set recently, the TOC information of the audio recording medium set only in the past is mainly used. Also, in the audio signal processing device (10) which is designed to erase the storage in the encoding format, this may occur when an audio recording medium from which TOC information has been erased has been set for a long time. At the start of setting, even if the TOC information is not stored in the storage means, during the setting, the storage instruction means stores the TC information in the storage means.
Once the OC information and the encoding format are stored in the storage means, subsequent reproduction instructions can be immediately decoded in the correct decoding format.

The audio signal processing device (10) of the present invention has decoding means control means. When the audio recording medium is set, the decoding means control means checks whether or not the audio recording medium has the TOC information read by the audio recording data reading section (11) as the TOC information stored in the storage means. Otherwise, if a reproduction instruction is given for the audio recording medium, the audio recording data reading section (11) sends the audio recording medium from the first reproduction start position as the reproduction start position of the reproduction instruction in the reproduction progress direction. The recording data is read out, and the encoding format detecting means (14) detects the encoding format of the read data signal from the reading data signal of the audio recording data reading section (11), and the encoding format detecting means (14) detects the encoding format. After that, the audio recording data is read again from the first reproduction start position in the reproduction progress direction. Part (11) by reading the audio data recorded on the audio recording medium to decode the decoding means by the corresponding decoding format to encoded format by detecting the encoding format detecting means read data signals (14) (20).

[0016] In this manner, even when reproducing an audio recording medium in which the TOC information and the encoding format are not stored in the storage means in association with each other, the reproduction can be performed from the first reproduction start position without causing a truncation. Can be.

According to the audio signal processing apparatus (10) of the present invention, the decoding format control means (14) detects the encoding format on the encoding format detecting means (14) when the reproduction is instructed.
It also serves to detect the encoding format to the encoding format detecting means (14) by the storage instructing means.

The storage instructing means detects the encoding format by using the encoding format detection by the encoding format detection instruction to the encoding format detecting means (14) by the decoding means control means at the time of the reproduction instruction. Is streamlined.

According to the audio signal processing device (10) of the present invention, when the storage means cannot store the correspondence between the TOC information and the encoding format due to a decrease in the remaining storage capacity, the last set is the most recent set. After the storage of the correspondence between the encoding format and the TOC information for the optical disk is erased, the new correspondence between the TOC information and the encoding format is stored.

In order to know the TOC information and the encoding format of the optical disk whose last set is the oldest, it is necessary to store the set history and the like together with the TOC information and the encoding format in the storage means. The audio recording medium that the user prefers tends to be set in the audio signal processing device (10) recently. Therefore, by prioritizing the TOC information and encoding format of the audio recording medium set recently and storing the same in the storage means, the audio recording medium set this time in the TOC information stored in the storage means is stored. It is possible to suppress a situation in which the object is not found.

Instead of erasing the storage of the correspondence between the encoding format and the TOC information for the optical disk whose last set is the oldest, the number of sets for each audio recording medium in the latest predetermined period is stored. In this case, the TOC information and the encoding format of the audio recording medium with a small number of times of setting are deleted, and the T
The storage of the OC information and the encoding format may be secured.

According to the audio signal processing device (10) of the present invention, the audio recording data recording the audio recording data so that the reproduction can be performed in a plurality of encoding formats from the reproduction start position at the time of the reproduction instruction. In the case of a reproduction instruction for which the user does not specify what kind of audio recording data is set for the medium, the reproduction is set so as to reproduce the audio recording data having the first reproduction priority set in advance.

In an optical disk such as a DVD, audio recording data is in a plurality of encoding formats within a predetermined reproduction range.
If the audio recording data for which the decoding format is set is not determined, the playback process will not proceed.
It is assumed that reproduction is performed on audio recording data of the reproduction priority number 1 set in advance. Therefore,
The detection of the encoding format by the encoding format detecting means (14) and the storage of the encoding format in the storage means also relate to the audio recording data having the first reproduction priority. Is not specifically determined, for example, default audio recording data or audio recording data selected at the time of the previous reproduction instruction. In this way, even in response to a reproduction instruction for which the user does not specify what kind of audio recording data, it is possible to reproduce the audio in the encoding format suitable for the user's preference without any breaks.

According to the audio signal processing device (10) of the present invention, the encoding format detecting means (14) is connected to the source device (12).
The decoding means (20) is provided in the receiver (11), and the source device (12) and the receiver (11) can communicate with each other.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a main part of the AV system 10. Receiver 11 and source device 12,
Both have host microcomputers 13 and 14,
14, the code can be mutually transmitted and received freely. Various optical disks such as a DVD and a CVD can be set on the source device 12, and the source device 12 can read audio recording data recorded on the optical disk being set. The source device 12 also reads out the TOC information of the optical disc at the start of setting the optical disc and stores it in a memory (hereinafter, this memory is referred to as “TOC information memory”).

FIG. 2 is a block diagram of the receiver 11. A
The D converter 18 receives left and right channel analog signals from analog source devices such as a tape player (not shown) and converts them into digital signals. DIR19 (D
digital interface register
In r), a digital signal sent from the host microcomputer 14 such as a DVD player is input. DSP20 is A
Digital signals from the D converter 18 and the DIR 19 are input. DSP 20 supports PCM, DTS, MPEG, and A
C-3 (Audio in DOLBY DIGITAL)
Coding). Host microcomputer
13 receives a digital signal from the DIR 19 and converts the digital signal into PCM, DTS, MPEG, and AC-
3 is detected, and DS is determined based on the detection result.
The decoding format in P20 is switched. The output of the DSP 20 is sent to three D / A converters 21, 22, and 23 and converted into analog signals. The output of the D / A converter 21 is sent to the front left and right speakers, respectively, and the output of the D / A converter 22 is The output is sent to the front center speaker and the subwoofer, and the output of the DA converter 23 is sent to the rear left and right speakers, respectively.

In FIG. 2, the host microcomputer 13 of the receiver 11 detects whether the encoding format of the optical disk is PCM, DTS, MPEG, or AC-3. And the detection result may be notified from the host microcomputer 14 to the host microcomputer 13. In that case,
The host microcomputer 13 has a memory (not shown), and uses it as a memory for TOC information and a memory for TOC-encoded format correspondence information described later.

FIG. 3 is a flowchart of a reproduction process in the AV system 10. In S30, the user instructs reproduction by menu reproduction on the remote controller. When the user presses the playback mode button on the remote controller, a main menu is displayed on a monitor (not shown) of the AV system 10. The menu has a hierarchical structure.When the user selects, the main menu sequentially shifts to lower submenus, and when the user encounters an option that cannot proceed further down, the scene corresponding to the option is set as a playback start position with a video and Audio playback starts. Playing back from the scene selected via the menu screen in this way is called "menu playback". In S31, a menu reproduction instruction (including the reproduction start position) is transmitted by a predetermined code from the host microcomputer 13 of the receiver 11 to the host microcomputer 14 of the source device 12. S3
In step 2, the speaker (not shown) and the monitor are muted, and the source device 12 sets the playback start position of the audio recording data of the currently set optical disk to a playback start position (hereinafter, a playback start position at which playback is started according to a playback instruction). 1
Playback start position ". ) Is read out in the reproduction progress direction. In DVD, depending on the first playback start position, PC
In some cases, reproduction is performed in any of various encoding formats such as M, DTS, MPEG, and AC-3, and when no encoding format is selected by the user, the default encoding format is used. The reproduction in the format is performed, and the corresponding audio recording data is read from the optical disk. Further, depending on the setting in advance, the reproduction is continuously performed in the encoding format selected in the previous reproduction, and the corresponding audio recording data is read from the optical disk. In S33,
From the read data signal, the encoding format is
The host microcomputer 14 of the receiver 12 detects the audio recording data and notifies the host microcomputer 13 of the receiver 11 of the detected audio recording data. In S34, the host microcomputer 13 of the receiver 11
The decoding format of the DSP 20 is switched to a decoding format corresponding to the encoding format notified from the host microcomputer 14 of the source device 12. In S35, the mute of the speaker and the monitor is released, and the end of the switching in S33 is notified from the host microcomputer 13 of the receiver 11 to the host microcomputer 14 of the source device 12. In S36, the source device 12
Returns to the first playback start position and starts playback. That is, the source device 12 reads the audio recording data of the optical disk from the first reproduction start position, sends it to the receiver 11, and sends the audio recording data to the receiver 11.
And the reproduced sound is output from the speaker.

FIG. 4 is a flowchart of another reproduction process in the AV system 10. As a premise of the processing of FIG.
As soon as the optical disk is set, the source device 12 reads out the TOC information of the optical disk and stores it in the TOC information memory. Further, the TOC information and the encoding format of the optical disc set in the source device 12 in the past are associated with each other, and a predetermined memory of the source device 12 (hereinafter, this memory is referred to as “TOC-encoding format correspondence information memory”). .). At S40, menu reproduction is instructed. S4
In step 1, it is determined whether TOC information that matches the TOC information of the currently set optical disk exists in the memory for the TOC-encoded format correspondence information. If the determination is Yes, the process proceeds to S42; , To S45. S4
2, the TOC of the TOC-encoded format correspondence information memory that matches the TOC information of the optical disc currently set.
The encoding format associated with the information is obtained, and the encoding format is notified from the host microcomputer 14 of the source device 12 to the host microcomputer 13 of the receiver 11. In S43, the host microcomputer 13 of the receiver 11
The decoding format of the DSP 20 is switched to a decoding format corresponding to the encoding format notified by the notification. In S44, the source device 12 starts playback from the first playback start position.
That is, the source device 12 reads the audio recording data of the optical disk from the first reproduction start position, sends it to the receiver 11, and sends the audio recording data to the receiver 11.
The decoded sound is output by the DSP 20 and the reproduced sound is output from the speaker. In S45, the source device 12 reads the audio recording data of the optical disk from the first reproduction start position. In S46, the encoding format is detected from the read data signal, and the detected encoding format is notified to the host microcomputer 14 of the receiver 11, and the receiver 11
Of the DSP 20 is switched to the notification decoding format. Further, the detected encoding format is associated with the TOC information in the TOC information memory, and the TO
It is stored in the C-encoding format correspondence information memory. At this time, if the remaining amount of the memory for the TOC-encoded format correspondence information is small and the correspondence between the encoding format and the TOC information for the current optical disc cannot be recorded in the memory for the TOC-encoded format correspondence information, the last The recording of the encoding format and the TOC information of the optical disk whose set is the oldest is deleted, and the current encoding format and the TOC information are stored in the memory area vacated by the deletion.
The information is recorded in association with the C information. In S47, the receiver
The host microcomputer 14 of 11 switches the decoding format of the DSP 20 to the format notified by the host microcomputer 13 of the source device 12.

In the progress of S42 to S44 in FIG. 4, the DSP 20 of the receiver 11 is set before the reproduction of the first reproduction start position is started.
Has been switched to the decoding format corresponding to the read data signal from the source device 12, so that no truncation occurs, but the DSP 20 of the receiver 11 proceeds in S45 to S47.
However, it takes time until the read format of the read data signal output from the source device 12 is switched to the decode format corresponding to the encode format. Therefore, there is an improved type shown in FIG.

FIG. 5 is a diagram in which A is obtained by changing some of the steps in FIG.
5 is a flowchart of a reproduction process in the V system 10. In the flowchart of FIG. 5, S45 of FIG. 4 is replaced with S32 of FIG. I can get up again. In addition to the replacement, S47 in FIG.
36. Thus, the determination in S41 is No.
Also, the playback sound from the first playback start position can be output without interruption.

[Brief description of the drawings]

FIG. 1 is a block diagram of a main part of an AV system.

FIG. 2 is a block diagram of a receiver.

FIG. 3 is a flowchart of a reproduction process in the AV system.

FIG. 4 is a flowchart of another reproduction process in the AV system.

FIG. 5 is a flowchart of a reproduction process in the AV system in which some steps in FIG. 4 are changed.

[Explanation of symbols]

 Reference Signs List 10 AV system (audio signal processing device) 11 Receiver (audio recording data reading unit) 12 Source device 13 Host microcomputer (encoding format detecting unit) 14 Host microcomputer (storage instructing unit) 20 DSP (decoding unit)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) 9A001 F term (reference) 5D020 AC00 5D044 AB05 DE43 DE54 FG18 GK12 JJ02 JJ05 5D045 DA06 5D077 CA02 DC21 DF01 HC37 5D090 AA01 AA04 FF42 GG21 GG33 9A001 EE04 HH17 KK54

Claims (9)

[Claims] 1. An audio recording data reading section (11) capable of reading audio recording data recorded on an audio recording medium in a set, and (b) a reproduction start position of the reproduction instruction based on the reproduction instruction. The audio recording data reading unit (11) reads the audio recording data from the audio recording medium in the reproduction progress direction from the first reproduction start position, and outputs the read data signal from the reading data signal of the audio recording data reading unit (11). Encoding format detecting means (14) for detecting the encoding format, (c) after the encoding format detecting means (14) detects the encoding format, reading the audio recording data again from the first reproduction start position in the reproduction progress direction. Unit (11) reads out audio recording data from an audio recording medium, and outputs the read data signal to the encoding format. A decoding means (20) for decoding in a decoding format corresponding to the encoding format detected by the expression detecting means (14), and (d) an electric signal before conversion into sound based on the output of the decoding means (20). An audio signal processing device comprising: reproduced sound signal generating means (20) for generating a reproduced sound signal. 2. The decoding means (2) from the time of a reproduction instruction.
2. The audio signal processing device according to claim 1, further comprising a mute unit for muting the output of the reproduced sound until the start of decoding by (0). (A) When an audio recording medium is set, the audio recording data reading section reads out the TOC information from the audio recording medium and allows the audio recording data of the audio recording medium to be freely read during the setting. 11), (b) an encoding format detecting means (14) for detecting an encoding format of the read data signal from a read data signal generated by reading the audio recording data of the audio recording medium being set by the audio recording data reading section (11). , (C), the audio recording medium read out of the TOC information by the audio recording data readout unit (11) and the encoding format detected by the encoding format detecting means (14).
Storage means for storing the C information and the encoding format in association with each other even after unsetting; (d) the TOC information read from the audio recording medium by the audio recording data reading unit (11) is the TOC information stored in the storage means; Encoding format detecting means for detecting the encoding format associated with the TOC information, if any, if any, and (e) the encoding in response to a reproduction instruction for an audio recording medium in the set. Decoding means (20) for decoding the read data signal of the audio recording data reading section (11) in a decoding format corresponding to the encoding format detected by the format detecting means, and (f) an output of the decoding means (20). Reproduction sound signal generation means (20) for generating a reproduction sound signal as an electric signal before conversion to sound based on the
An audio signal processing device comprising: 4. When an audio recording medium is set, whether or not the TOC information read by the audio recording data reading section (11) for the audio recording medium is included as TOC information stored in the storage means is detected. And
If not, the encoding format of the audio recording data of the audio recording medium is determined by the encoding format detecting means.
(14) to detect the T
4. The audio signal processing device according to claim 3, further comprising a storage instruction unit that stores OC information and an encoding format in the storage unit in association with each other. 5. When an audio recording medium is set, it is checked whether the audio recording medium has TOC information read by the audio recording data reading section (11) as TOC information stored in the storage means. If there is no reproduction instruction for the audio recording medium, the first reproduction start position as the reproduction start position of the reproduction instruction
The audio recording data reading unit (11) reads the audio recording data of the audio recording medium in the reproduction progress direction from the reproduction start position of the audio recording data, and encodes the reading data signal from the reading data signal of the audio recording data reading unit (11). The format is detected by the encoding format detecting means (14), and after the encoding format detecting means (14) detects the encoding format, the audio recording data reading unit ( 11) causing the audio recording data of the audio recording medium to be read, and reading the read data signal by the encoding format detecting means.
5. The audio signal processing apparatus according to claim 3, further comprising: decoding means control means for causing the decoding means (20) to decode in a decoding format corresponding to the encoding format detected by (14). 6. The detection of the encoding format by said decoding means control means by said decoding means control means at the time of a reproduction instruction is performed by the detection of the encoding format by said storage instruction means by said encoding format detection means. The audio signal processing device according to claim 5, wherein the audio signal processing device also functions as: 7. The storage means, when the correspondence between the TOC information and the encoding format cannot be stored due to a decrease in the remaining storage capacity, the encoding format and the TOC of the optical disk whose last set is the oldest. 7. The audio signal processing apparatus according to claim 3, wherein the storage of the correspondence with the information is deleted, and then the new TOC information and the correspondence of the encoding format are stored. . 8. An audio recording medium on which audio recording data is recorded so that a user can reproduce in a plurality of encoding formats from a reproduction start position at the time of a reproduction instruction. The audio signal processing according to any one of claims 1 to 7, wherein the reproduction instruction is not set so that the reproduction is performed with respect to the audio recording data having the first reproduction priority set in advance. apparatus. 9. The encoding format detecting means (14) is provided in a source device (12), the decoding means (20) is provided in a receiver (11), and the source device (12) and the receiver (11) are provided. The audio signal processing apparatus according to claim 1, wherein the audio signal processing apparatuses can communicate with each other.