JP3803284B2 - Playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present inventionReOutput level adjustment in a live playback device, for example, an audio playback device suitable for in-vehicle useNeatlyRelated.
[0002]
[Prior art]
  ReThe sound source of the live device ranges from a medium such as a conventional general broadcast wave or a cassette tape to a medium using a disk such as a recent CD, MD and DVD as a medium. Among these, the present invention mainly describes a medium using the latter disk as a medium.
[0003]
When looking at sound sources that use a disk as a medium, the recording form of the sound source usually differs depending on the type of the disk. For example, the above CD / MD and DVD have different recording forms.
[0004]
DVDs have their own different recording formats. Typical examples are the following three types of recording:
<1> Linear PCM
<2> AC-3 (Audio Code Number 3)
<3> DTS (Digital Theater Systems)
There is.
[0005]
Looking at the above three types of recording modes in more detail, <1> linear PCM recording produces a relatively high playback volume. On the other hand, in AC-3 / DTS of <2> and <3>, recording is performed so as to produce a low reproduction volume as a whole in order to ensure a wide dynamic range.
[0006]
[Problems to be solved by the invention]
Thus, when the user wants to listen to music or sound from a DVD, the output level of the reproduced sound depends on whether the sound source is linear PCM or something other than linear PCM such as AC-3 / DTS. Generally, it is higher in the former and lower in the latter.
[0007]
In addition, since AC-3 / DTS and the like are originally assumed to be played back by six speakers including a center speaker, generally there are few cases where a center speaker is arranged. Furthermore, the output level is lowered.
[0008]
Therefore, after the user has finished listening to the playback sound from the DVD that uses a sound source other than the linear PCM such as AC-3 / DTS, the mode is then changed to the DVD or CD / MD that uses the linear PCM as the sound source. When switching, a loud reproduction sound is output from the speaker. As a result, there is a problem that the user is surprised by the sudden loud volume when the mode is switched.
[0009]
At this time, naturally, the user rushes to narrow the volume.
[0010]
  Therefore, the present invention reproduces at least a DVD as a medium.ReIt is an object of the present invention to provide an output level adjustment system capable of automatically suppressing a large fluctuation in output level caused when a medium or a sound source is switched between modes due to a difference in sound source recording form. Is.
[0011]
[Means for Solving the Problems]
FIG. 1 is a flowchart showing basic steps of an output level adjustment operation according to the present invention.
[0012]
The output level adjusting method of the present invention is applied to an audio playback apparatus capable of setting at least a DVD (Digital Versatile Disc) as a playback medium, and includes three steps S11, S12, and S13 shown in the figure. The contents of these steps are as follows.
[0013]
Step S11: It is discriminated whether or not the set reproduction medium is a DVD.
[0014]
Step S12: When the set playback medium is identified as a DVD, the sound source of the DVD is either the first recording form that is played back at a high volume or the second recording form that is played back at a low volume. It is determined whether the sound source is in the form of recording.
[0015]
  Step S13: The sound source is in the second recording formPlayback mediaWhenonlyIncrease the volume to be played (UP)Control. On the other hand, when the determination result in step S12 is Yes, that is, when it is determined that the reproduction medium is in the first recording form, the volume is maintained.
[0016]
The first recording form is a linear PCM according to the above-described example, and is a recording form using a reproduction medium other than a DVD such as a CD / MD in the above-described example, and the second recording form is According to the above-mentioned example, it is AC-3 or DTS. However, it is not limited to these.
[0017]
In the above example, there are two types of recording modes. However, three or more types of recording modes can also be supported. In this case, the recording mode is detected and volume adjustment corresponding to the detected recording mode is performed.
[0018]
Specifically, volume adjustment data is stored in association with the recording form, and the volume adjustment data corresponding to the detected recording form is read and volume adjustment is performed.
[0019]
In the above example, the playback medium is a DVD. However, playback media other than DVD can be used, and other playback media such as a CD may be used.
[0020]
Thus, by performing the above steps S11 to S13 automatically in the audio apparatus, the sound source is only in the second recording form, that is, in the case of media that is reproduced at a low volume such as AC-3 or DTS. The volume can be selectively increased, and therefore the first recording mode, ie, linear PCM or, if there is a medium such as MPEG2 if it is present, the volume should not be increased. it can.
[0021]
As a result, when the sound source is switched from the second recording form to the first recording form, the above-described problem that the user is surprised at the sudden loud volume at that time is solved. In addition, the user is amazed at the sudden loud volume and is freed from an operation in which the user manually narrows the volume.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 2 is a flowchart showing the first embodiment according to the present invention.
[0023]
The flowchart of this figure specifies the first recording form as linear PCM, and specifies the second recording form as AC-3 or DTS. (In each of the following drawings, linear PCM, AC-3, and DTS are described as specific examples of the above-described recording forms.)
Therefore, steps S21, S22 and S23 in FIG. 2 are completely equivalent to steps S11, S12 and S13 in FIG. 1, respectively.
[0024]
FIG. 3 is a flowchart showing a second embodiment according to the present invention.
[0025]
As shown in the figure, it consists of steps S31 and S32.
After step S31 (same as S23 in FIG. 2) for automatically increasing the volume to be reproduced, from a DVD whose sound source is the second recording form (AC-3 / DTS, etc.), other reproduction media (CD / MD etc.) or when the mode is switched to the DVD whose sound source is the first recording form (linear PCM etc.)
Step S32 for automatically returning the volume to the level before occurrence of the mode switching is further provided.
[0026]
In this case, the volume before the mode switching needs to be stored, but this can be stored in a memory built in the electronic VOL (volume) (described later).
[0027]
Thus, according to the second embodiment, even when switching to another reproduction medium (CD / MD, general broadcast wave, etc.) again, there is no need for the user to manually reduce the volume.
[0028]
FIG. 4 is a flowchart showing a third embodiment according to the present invention.
[0029]
As shown in the figure, the process consists of steps S41 to S43.
After step S41 (same as S23 in FIG. 2) for automatically increasing the volume to be reproduced, the user has step S42 for further fine adjustment to the volume manually (manually),
After that, the DVD whose sound source is the second recording form (AC-3 / DTS, etc.) to the other reproduction media (CD / MD, etc.) or the sound source is the first recording form (linear PCM, etc.) When the mode is switched,
Step S43 for returning to the volume before the occurrence of mode switching while reflecting the fine adjustment of the volume described above is provided.
[0030]
In the state of step S41, there may be a situation where the user wants to further change the automatically set volume. For example, a user who drives a car equipped with the audio playback device is automatically set as described above under circumstances such as when the car enters high-speed driving or enters a tunnel. Hope to further adjust the volume to increase the volume.
[0031]
On the other hand, in a situation where a child riding in the car falls asleep, it is desired to further fine-tune the above automatically set volume to lower the volume.
[0032]
After making fine adjustments to the volume as described above, when the sound source is switched to mode such as linear PCM, it is automatically set to a new volume again, but even in this case, assuming that the above situation is maintained. The fine adjustment of the volume added in step S42 in each situation is advantageously reflected as it is under the new automatically set volume. Otherwise, the user must perform the same operation as step S42 again after the mode switching.
[0033]
Thus, according to the third embodiment, the volume desired by the user can be automatically maintained even when switching to another playback medium (CD / MD, general broadcast, etc.) again.
[0034]
FIG. 5 is a flowchart showing a fourth embodiment according to the present invention.
[0035]
As shown in the figure, it consists of steps S51 and S52.
After the step S51 for automatically increasing the volume to be reproduced (same as S23 in FIG. 2), when the DVD used so far is ejected (EJECT), the step returns to the volume before the occurrence of the ejection S52, It is characterized by further having.
[0036]
When the DVD currently being listened to (sound source is AC-3, DTS, etc.) is removed from the audio playback device, it is not known when and when a new playback media is inserted into the device. There is a high possibility that a playback medium (CD / MD, linear PCM DVD, etc.) different from AC-3 or DTS) is inserted.
[0037]
Therefore, when a DVD such as AC-3 or DTS is removed (EJECT), it is automatically set so as to immediately return to the original volume.
[0038]
Thus, according to the fourth embodiment, even when a medium with a different sound source, for example, a DVD (linear PCM) is replaced, it is possible to deal with a new medium without forcing the user to perform an initialization operation.
[0039]
FIG. 6 is a flowchart showing a fifth embodiment according to the present invention.
[0040]
In the first to fourth embodiments described above, attention is paid to “volume” as an adjustment factor of the output level from the audio playback device. In the fifth to eighth embodiments, the output level is adjusted. Focus on “frequency characteristics” as a factor.
[0041]
First, as shown in FIG. 6, the fifth embodiment includes steps S61 to S63. It is as follows.
[0042]
Step S61: It is identified whether or not the set reproduction medium is a DVD (same as step S21 in FIG. 2).
[0043]
Step S62: When the set reproduction medium is identified as a DVD, the sound source of the DVD is reproduced in a first recording form (linear PCM or the like) reproduced at a high volume or a second reproduced in a low volume. It is determined whether the sound source is a recording form (AC-3, DTS, etc.) (same as step S22 in FIG. 2).
[0044]
Step S63: When the sound source is a sound source according to the second recording mode, the frequency characteristic (f characteristic) in the speech band of the output to be reproduced is raised.
[0045]
This step S63 is a notable step.
[0046]
Generally, an increase in volume feeling similar to the above-described “volume increase” can also be expected by raising the frequency characteristics. In this case, it is particularly effective to raise the speech (dialog) band (for example, 300 Hz to 3 kHz). This is because, for example, when switching from a linear PCM sound source to an AC-3 / DTS sound source, the AC-3 / DTS sound source experiences a significant drop in volume in the speech band (conversation is difficult to hear). based on.
[0047]
Thus, according to the fifth embodiment, when a sound source DVD such as AC-3 or DTS is switched to another medium, the user manually adjusts the equalizer (EQ) against the level difference with the other medium. This eliminates the hassle of raising the f-characteristic of the self-band each time.
[0048]
FIG. 7 is a flowchart showing a sixth embodiment according to the present invention.
[0049]
As shown in the figure, it consists of steps S71 and S72.
After step S71 (same as S63 in FIG. 6) for automatically raising the frequency characteristic in the speech band of the output to be reproduced, from the DVD whose sound source is the second recording form (AC-3 / DTS, etc.) When the mode is switched to other playback media (CD / MD, etc.) or to the DVD whose sound source is the first recording form (linear PCM, etc.)
Step S72 for automatically returning to the frequency characteristic (f characteristic) before the mode switching is further provided.
[0050]
Thus, according to the sixth embodiment, even when switching to another reproduction medium (CD / MD, general broadcast, etc.) again, it is not necessary for the user to manually operate the equalizer and lower the f characteristic of the serif band. .
[0051]
FIG. 8 is a flowchart showing a seventh embodiment according to the present invention.
[0052]
As shown in the figure, it consists of steps S81 to S83,
After step S81 (same as S63 in FIG. 6) of automatically raising the frequency characteristic (f characteristic) in the speech band of the output to be reproduced, the user manually (manually) equalizes the frequency characteristic of the output to be reproduced. (EQ) has a step S82 for further fine adjustment,
After that, when the mode is switched from the DVD whose sound source is the second recording form (AC-3 / DTS or the like) to other playback media or the DVD whose sound source is the first recording form,
Step S83 for returning to the frequency characteristic (f characteristic) before the occurrence of the mode switching while reflecting the fine adjustment of the frequency characteristic is provided.
[0053]
The background in which the seventh embodiment is effective is exactly the same as the background described in the third embodiment (FIG. 4), and a car equipped with the audio playback device enters a high-speed travel or a tunnel travel. (EQ adjustment UP at this time) or when a child is sleeping in the vehicle (EQ adjustment down at this time).
[0054]
Thus, according to the seventh embodiment, the sound volume (sound quality) desired by the user can be obtained even when switching to another reproduction medium (CD / MD, general broadcast, etc.) again, as in the third embodiment. Can be maintained automatically.
[0055]
FIG. 9 is a flowchart showing an eighth embodiment according to the present invention.
[0056]
As shown in the figure, it consists of steps S91 and S92.
When the DVD used so far is ejected after step S91 (same as S63 in FIG. 6) of automatically raising the frequency characteristic (f characteristic) in the speech band of the output to be reproduced,
Step S92 for returning to the frequency characteristic before the occurrence of the ejection is further provided.
[0057]
The background in which this eighth embodiment is effective is exactly the same as the background described in the fourth embodiment (FIG. 5), and the DVD currently being listened to (sound source is AC-3, DTS, etc.) is extracted. Prepare for the next media to be inserted. Since this new media is highly likely to be a DVD or CD / MD such as linear PCM, which is different from the previous media (AC-3, DTS, etc.), the original f should be restored in advance for that time. To leave.
[0058]
Thus, according to the eighth embodiment, even when media are replaced, new media can be handled without forcing the user to perform an initialization operation.
[0059]
FIG. 10 is a flowchart showing a ninth embodiment according to the present invention.
[0060]
The above first to fourth embodiments focus on “volume” as an output level adjustment factor, and the above fifth to eighth embodiments focus on “f characteristics” as an output level adjustment factor. . Further, in the ninth to eleventh embodiments described below, attention is paid to “volume and f characteristics” as an adjustment factor of the output level.
[0061]
First, as shown in FIG. 10, the ninth embodiment includes steps S101 to S103. It is as follows.
[0062]
Step S101: It is identified whether or not the set reproduction medium is a DVD (same as step S21 in FIG. 2).
[0063]
Step S102: When the set playback medium is identified as a DVD, the sound source of the DVD is played in a first recording form (linear PCM or the like) that is played back at a high volume or a second that is played back at a low volume. It is determined whether the sound source is a recording form (AC-3, DTS, etc.) (same as step S22 in FIG. 2).
[0064]
Step S103: When the sound source is a sound source according to the second recording mode, the frequency characteristic (f characteristic) in the speech band of the output to be reproduced is raised and the volume to be reproduced is increased (volume UP).
[0065]
This step S103 is a notable step.
[0066]
As described above, the object of the present invention can be achieved by combining the automatic adjustment of the f characteristic and the automatic adjustment of the sound volume. In this case, there is a somewhat complicated problem of how to weight the two to be combined, but on the other hand, a fine adjustment adapted to the user's sense can be expected.
[0067]
According to the ninth embodiment, it is possible to prevent the occurrence of output distortion due to excessive increase of the f characteristic in an audio reproducing apparatus having a small volume head clearance. Specifically, the following steps shown in FIG. 11 are executed.
[0068]
FIG. 11 is a flowchart showing a preferred implementation example of step S103 in the steps of FIG.
[0069]
That is, FIG. 11 shows step S103 as steps S104 and S105 more specifically among steps S101 to S103 in FIG. 10, and raises the frequency characteristics in the speech band of the output to be reproduced and the volume to be reproduced. In step S103 for increasing
The frequency characteristic (f characteristic) is changed to such an extent that overhead is not generated, and the volume is increased (volume UP) by an amount insufficient for the change in the frequency characteristic.
[0070]
When overhead (saturation) occurs, the sound quality deteriorates. Therefore, it is preferable to slightly suppress the adjustment of the f characteristic, and to compensate for the lack of sound volume by increasing the sound volume.
[0071]
FIG. 12 is a flowchart showing a tenth embodiment according to the present invention.
[0072]
As shown in this figure,
After step S111 (= S103) of raising the frequency characteristic in the speech band of the output to be reproduced and increasing the volume to be reproduced, the sound source is from the second recording form DVD to another reproduction medium or the sound source When the mode is switched to the DVD which is the first recording form,
Step S112 is further provided for returning to the volume before the mode switching and the frequency characteristics before the mode switching.
[0073]
The background required for the tenth embodiment and the effects thereof are the same as those of the second embodiment (FIG. 3) and the sixth embodiment (FIG. 7) described above.
[0074]
FIG. 13 is a flowchart showing an eleventh embodiment according to the present invention.
[0075]
As shown in this figure,
When the DVD is ejected after step S121 (= S103) for raising the frequency characteristics in the speech band of the output to be reproduced and increasing the volume to be reproduced,
Step S122 is further provided to return the sound volume before the occurrence of ejection and the frequency characteristics before the occurrence of ejection.
[0076]
The background required for the eleventh embodiment and the effects thereof are the same as those in the fourth embodiment (FIG. 5) and the eighth embodiment (FIG. 9) described above.
[0077]
The first to fourth embodiments, the fifth to eighth embodiments, and the ninth to eleventh embodiments, which are the main embodiments of the present invention, have been described above. Supplementary twelfth and thirteenth embodiments will be described.
[0078]
FIG. 14 is a diagram showing the twelfth embodiment according to the present invention by way of example.
[0079]
In the first to fourth embodiments and the ninth to eleventh embodiments described above, the step of increasing the volume (automatic volume UP) is included, but the volume UP in this step is left to the device. Instead, it may be adapted to the user's preference.
[0080]
Therefore, in the twelfth embodiment, the volume level to be increased is made variable for each user.
[0081]
Referring to FIG. 14, this figure shows a screen of a display unit provided in the audio playback device, which is a touch panel that allows a user to make a desired setting by directly touching the screen. .
[0082]
In the example of this figure, the set DVD uses AC-3 / DTS as the sound source, and the volume increase amount (Volume Up amount) is set to 5 dB.
[0083]
Next, a supplementary thirteenth embodiment will be described.
[0084]
FIG. 15 is a diagram (part 1) showing the thirteenth embodiment according to the present invention by way of example;
FIG. 16 is the same figure (the 2).
[0085]
In the fifth to eighth embodiments and the ninth to eleventh embodiments described above, the step of adjusting the f characteristic (automatic f special adjustment) is included. Instead of leaving it up, it may be adapted to the user's preference.
[0086]
For this reason, in the thirteenth embodiment, the level for raising the frequency characteristics is made variable for each user.
[0087]
Referring to FIG. 15, on the screen of the display unit shown in the figure, an AC-3 / DTS DVD is set in the audio playback apparatus, and the given four types of f special patterns (1, 2 , 3, 4) indicates that the second f special pattern has been selected.
[0088]
In the example of FIG. 15, the AC special pattern is provided on the screen in common without distinguishing between AC-3 and DTS, but these AC-3 and DTS are handled individually. It is an example shown in.
[0089]
In the example of FIG. 16, the user has selected the third f-special pattern as AC-3 and has selected the second f-special pattern as DTS.
[0090]
In addition to the above-described embodiments, modified embodiments based on the present invention will be described.
[0091]
This modified embodiment is applied to an audio playback device having a built-in equalizer (EQ) function and a loudness function.
[0092]
FIG. 17 is a flowchart showing a modified embodiment according to the present invention.
[0093]
Steps S101 to S103 in the figure are similar to steps S101 to S103 shown in FIG.
Step S101 for identifying whether or not the set reproduction medium is a DVD,
When the set playback medium is identified as a DVD, the sound source of the DVD is recorded in either the first recording form reproduced at high volume or the second recording form reproduced at low volume. Step S102 for determining whether the sound source; and
When the sound source is a sound source according to the second recording form, step S103 is performed to raise the frequency characteristic in the speech band of the output to be reproduced.
[0094]
And then
In step S131, the maximum change width of the frequency characteristic is obtained.
In step S132, the gain of the equalizer (EQ) or the gain of loudness is reduced by the maximum change width.
[0095]
Further, when the mode is switched from the DVD whose sound source is the second recording form to the other reproduction medium or the DVD whose sound source is the first recording form after being lowered by the maximum change width,
A step S134 is further provided for returning the equalizer gain or the loudness gain to the frequency characteristic before the mode switching, while reducing the gain of the equalizer by the maximum change width.
[0096]
The maximum change width (for example, the height of the mountain in FIG. 15) is obtained, and the equalizer level or the loudness level is lowered as much as the maximum change width. Then, when the media is replaced after that, the lowered amount is valid as it is.
[0097]
Immediately after switching the mode to DVD of AC-3 or DTS sound source, there is no special change in f, so the feeling that the output level has increased cannot be obtained, but the output between DVD and other media is not possible even when switching to other media. Since there is no level difference, the user is not surprised by sudden loud sound.
[0098]
In each of the above-described embodiments, two recording forms different as sound source recording forms, that is, the first and second recording forms have been described as examples. However, the present invention is not limited thereto, and the third, fourth,. Even if a recording form exists, the present invention can be similarly applied.
[0099]
On the other hand, the output level adjustment function according to the present invention need not always be operated, but may be turned on only when desired for the convenience of the user, and may be turned off at other times.
[0100]
Finally, a configuration example of an audio reproducing apparatus capable of implementing the above-described output level adjusting method according to the present invention will be shown.
[0101]
FIG. 18 is a diagram showing an example of the configuration of an audio playback apparatus that can implement the present invention.
[0102]
In the figure, reference numeral 1 indicates the entire audio reproducing apparatus.
[0103]
The left end of this figure shows the input side of the sound source, and DVD, CD and MD are illustrated. Any one of these DVD / CD / MD is selected by the switch unit 2. This selection is performed via the control unit 4 when the user presses a predetermined key in the operation unit 3.
[0104]
For example, if DVD is selected, the output signal is first input to the decoder 5. The decoder 5 decodes the input output signal and outputs control data and original video data and audio data.
[0105]
The control data is input to the control unit 4. This data includes information for distinguishing DVD / CD / MD and various control information such as linear PCM, AC-3, DTS. Therefore, for example, the determination of “Is the playback medium a DVD?” Shown in step S21 (FIG. 2) can be made by the control unit 4 based on the control information. The same applies to the determination of “Is the sound source linear PCM?” Shown in step S22 (FIG. 2), for example.
[0106]
Of the output data from the decoder 5, the video data is input to the display unit 6 where video is displayed.
[0107]
On the other hand, the audio data from the decoder 5 particularly related to the present invention is sent from the speaker 12 through the equalizer (EQ1) 7 → the equalizer (EQ2) 8 → the loudness circuit 9 → the electronic VOL (volume) 10 → the power amplifier 11. It is provided to the user as music or voice.
[0108]
In this figure, the block 20 is generally formed integrally by a DSP (Digital Signal Processor). Therefore, the description will be continued by taking the case of using this DSP as an example.
[0109]
FIG. 19 is a diagram showing a configuration example (volume system) of the control unit 4 in FIG.
20 is a diagram illustrating a configuration example (frequency system) of the control unit 4 in FIG.
[0110]
First, referring to FIG. 19, in the volume system of the control unit 4, the type of the sound source being reproduced is known from the control data from the decoder 5, and the volume adjustment value corresponding to this type is output from the adjustment value setting unit 21. . This adjustment value is used, for example, in “automatic volume UP” shown in step S23 (the same applies to S31).
[0111]
On the other hand, the volume value (VOL value) designated by the user from the operation unit 3 is stored in the VOL value memory 22. This VOL value is used in, for example, “returning to the original volume” in step S32 (FIG. 3), changed in “manual volume adjustment” in step S42 (FIG. 4), and reflected in step S43 (FIG. 4). Is done.
[0112]
The data from the adjustment setting unit 21 and the data from the VOL value memory 22 described above are combined by the combining unit 23 and further applied to the electronic VOL 10 to obtain a predetermined volume from the speaker 12.
[0113]
In FIG. 19, the loudness control system is shown on the lower right side. Here, there is a loudness pattern table 24 (ROM) and a loudness coefficient setting unit 25.
[0114]
The loudness coefficient setting unit 25 generates a loudness coefficient to be given to a portion corresponding to the loudness circuit 9 in the DSP 20. For this generation, information indicating the type of sound source being reproduced and a loudness pattern are required. In general, the loudness pattern is a pattern that raises a low sound range and a high sound range, and a plurality of types of patterns P1, P2, P3,. Which pattern is selected is determined according to the volume during playback. For this purpose, the value of the VOL value memory 22 is used.
[0115]
Finally, FIG. 20 (frequency system of the control unit 4) will be described. In the frequency system of the control unit 4, the EQ source pattern table 45 (ROM) stores an initial equalizer pattern corresponding to the type of sound source (AC-3, DTS, CD, MD, etc.). All initial equalizer patterns are temporarily transferred from this table 45 to the EQ pattern table 46 (RAM). The reason for transferring in this way is that the pattern can be adjusted by the operation unit 3 according to the user's preference. This can be used, for example, for changing the f special pattern shown in FIGS.
[0116]
Which EQ pattern in the EQ pattern table 46 is selected and read is determined by the type of the sound source being reproduced. If this type is, for example, AC-3, an EQ pattern corresponding to AC-3 is written and held in the adjustment EQ coefficient setting unit 37. This setting of the EQ pattern corresponds to, for example, an operation of “raising the f-characteristic of the serif band” shown in step S63. That is, an EQ pattern in which the f characteristic of the serif band is specially raised is supplied to a portion corresponding to the equalizer (EQ2) 8 in the DSP 20 of FIG. However, FIG. 20 shows a configuration example in which the EQ coefficient is given to the DSP 20 via the synthesis unit 34.
[0117]
When the sound source being reproduced returns to the original mode, for example, linear PCM, by mode switching, the EQ pattern corresponding to the linear PCM in the table 36 is read again and written to the adjustment EQ coefficient setting unit 37. You can tell what the original mode is by doing the following. For example, a flag can be set for each pattern in the EQ pattern table 36, and 1 is set for a flag of another pattern (original pattern) to be switched when mode switching occurs. To return to the original pattern again after the switching, the pattern with flag 1 may be selected. At this time, the flag is reset to 0 and returned to the initial state.
[0118]
In the combining unit 34 described above, the adjustment EQ coefficient and the manual EQ coefficient from the manual EQ coefficient setting unit 33 are combined, and the combined EQ coefficient is supplied to the DSP 20.
[0119]
The manual EQ is a well-known one and is used to change the equalizer characteristics according to the user's preference. The EQ acts on the equalizer (EQ1) 7 in FIG.
[0120]
In FIG. 20, the EQ source pattern table 31 (ROM) and the EQ pattern table 32 (RAM) further relate to the manual EQ. These functions are the same as those of the EQ source pattern table 35 and the EQ pattern table 36 described above. The same. However. The target of each pattern is different. For example, it is a pattern for reproduction in a rock tone, pop tone, classic tone or the like. The value of the EQ pattern table 32 can be finely adjusted via the operation unit 3 according to the user's preference.
[0121]
By setting the manual EQ coefficient, for example, “manual EQ adjustment” shown in step S82 (FIG. 8) can be performed.
[0122]
The operation of the practical example of the level adjustment circuit according to the present invention has been described in detail above. The basic idea of the present invention is expressed as a functional block as follows.
[0123]
FIG. 21 is a block diagram showing the principle configuration of the output level adjustment system according to the present invention.
[0124]
In the audio playback apparatus 1 capable of playing back playback media recorded in various recording forms, the output level adjustment system 50 based on the principle configuration is as follows:
It has a discriminating means 51 for discriminating the recording form type, and a variable means 52 for varying the volume to be reproduced in accordance with the discriminated recording form type.
[0125]
FIG. 22 is a block diagram showing a first basic configuration of the output level adjustment system according to the present invention.
[0126]
In the audio playback apparatus 1 capable of setting at least a DVD as a playback medium, the output level adjustment system 50 according to the first basic configuration includes:
Identification means 61 for identifying whether or not the set reproduction medium is a DVD, and a first recording form in which the sound source of this DVD is reproduced at a high volume when it is identified that the set reproduction medium is a DVD. Or, the sound source discriminating means 62 for discriminating which sound source is the sound source of the second recording form that is reproduced at a low volume, and when the sound source is the sound source of the second recording form, the sound volume to be reproduced is increased. Sound volume varying means 63 for causing
[0127]
Further, after the volume to be reproduced is increased by the volume varying means 63, the mode is switched from the DVD whose sound source is the second recording form to the other reproduction media or the DVD whose sound source is the first recording form. In addition, there is further provided original volume changing means 64 for returning to the volume before the mode switching occurs.
[0128]
Furthermore, after the volume varying means 63 for increasing the volume to be reproduced, there is fine adjusting means 65 for further finely adjusting the volume, and thereafter, the sound source is changed from the DVD in the second recording form to the other. When mode switching occurs on the playback medium or on the DVD whose sound source is the first recording form, the volume reflecting variable means 66 for returning to the volume before the mode switching occurs while reflecting the fine adjustment of the volume. Have
[0129]
Further, the volume changing means 63 for increasing the volume to be reproduced is further provided with a pull back means 67 for returning to the volume before the occurrence of ejection when the DVD is ejected.
[0130]
FIG. 23 is a block diagram showing a second basic configuration of the output level adjustment system according to the present invention.
[0131]
In the audio playback apparatus 1 capable of setting at least a DVD as a playback medium, the output level adjustment system 50 according to the second basic configuration includes:
Identification means 71 for identifying whether or not the set reproduction medium is a DVD, and a first recording form in which the sound source of the DVD is reproduced at a high volume when the set reproduction medium is identified as a DVD Alternatively, the discriminating means 72 for discriminating which sound source of the second recording form is reproduced at low volume, and the output speech band to be reproduced when the sound source is the sound source of the second recording form. And a raising means 73 for adjusting the volume characteristic for raising the frequency characteristic.
[0132]
Further, after the volume characteristic of the output to be reproduced is adjusted, when the mode is switched from the DVD whose sound source is the second recording form to the other reproducing media or the DVD whose sound source is the first recording form, the mode is changed. First state variable means 74 for returning to the state before switching is further provided.
[0133]
Furthermore, after adjusting the volume characteristic of the output to be reproduced, the apparatus has fine adjustment means 75 for making a fine adjustment to the volume characteristic adjustment of the output to be reproduced. When the mode is switched to a playback medium other than the above or to the DVD whose sound source is the first recording form, the second state variable means 76 for returning to the state before the mode switching occurs while reflecting the fine adjustment of the frequency characteristics. Have
[0134]
In addition, when the DVD is ejected after adjusting the volume characteristic of the output to be reproduced, there is further provided third state varying means 77 for returning to the state before the occurrence of the ejection.
[0135]
Furthermore, when the sound source is a sound source according to the second recording mode, there is a frequency volume varying means 78 for performing volume characteristic adjustment for increasing the volume to be reproduced.
[0136]
Here, in the frequency volume changing means 78 for raising the frequency characteristic in the speech band of the output to be reproduced and increasing the volume to be reproduced, the frequency characteristic is changed to such an extent that overhead is not generated, and the change of the frequency characteristic is insufficient. Increase the volume as much as you can.
[0137]
FIG. 24 is a block diagram showing a third basic configuration of the output level adjustment system according to the present invention.
[0138]
In the audio playback apparatus 1 that can set at least a DVD as a playback medium, the output level adjustment system 50 according to the third basic configuration includes:
Identification means 81 for identifying whether or not the set reproduction medium is a DVD, and a first recording form in which the sound source of the DVD is reproduced at a high volume when it is identified that the set reproduction medium is a DVD. Alternatively, the discriminating means 82 for discriminating which sound source is in the second recording form to be reproduced at a low volume, and when the sound source is a sound source in the second recording form, in the output speech band to be reproduced. And a calculating means 84 for obtaining the maximum change width of the frequency characteristic, and a lowering means 85 for reducing the equalizer gain or the loudness gain by the maximum change width.
[0139]
Further, when the mode is switched to the lowering means 85 from the DVD whose sound source is the second recording form to the other reproduction media or the DVD whose sound source is the first recording form, the gain of the equalizer or There is further provided a state variable means 86 for returning the loudness gain to the state before the mode switching while reducing the maximum change width.
[0140]
【The invention's effect】
As described above, according to the present invention, in an audio playback apparatus in which various media are set, the output level that varies depending on the recording form of the sound source recorded on each medium can be automatically adjusted.
[0141]
As a result, for example, when the mode is switched from a DVD that uses AC-3 or DTS as a sound source to a DVD or CD / MD that uses linear PCM as a sound source, the user is surprised by the sudden loud volume that occurs when the mode is switched. The occurrence of the situation can be eliminated.
[Brief description of the drawings]
FIG. 1 is a flowchart showing basic steps of an output level adjustment operation according to the present invention.
FIG. 2 is a flowchart showing a first embodiment according to the present invention.
FIG. 3 is a flowchart showing a second embodiment according to the present invention.
FIG. 4 is a flowchart showing a third embodiment according to the present invention.
FIG. 5 is a flowchart showing a fourth embodiment according to the present invention.
FIG. 6 is a flowchart showing a fifth embodiment according to the present invention.
FIG. 7 is a flowchart showing a sixth embodiment according to the present invention.
FIG. 8 is a flowchart showing a seventh embodiment according to the present invention.
FIG. 9 is a flowchart showing an eighth embodiment according to the present invention.
FIG. 10 is a flowchart showing a ninth embodiment according to the invention.
FIG. 11 is a flowchart showing a preferred implementation example of step S103 in the step of FIG.
FIG. 12 is a flowchart showing a tenth embodiment according to the present invention.
FIG. 13 is a flowchart showing an eleventh embodiment according to the present invention.
FIG. 14 is a diagram showing a twelfth embodiment according to the present invention by way of example.
FIG. 15 is a diagram (part 1) illustrating a thirteenth embodiment according to the present invention by way of example;
FIG. 16 is a diagram (part 2) illustrating the thirteenth embodiment according to the present invention by way of example;
FIG. 17 is a flowchart illustrating a modified embodiment according to the present invention.
FIG. 18 is a diagram illustrating a configuration example of an audio reproduction device capable of implementing the present invention.
FIG. 19 is a diagram illustrating a configuration example (volume system) of the control unit 4 in FIG. 18;
20 is a diagram illustrating a configuration example (frequency system) of the control unit 4 in FIG. 18;
FIG. 21 is a block diagram showing a principle configuration of an output level adjustment system according to the present invention.
FIG. 22 is a block diagram showing a first basic configuration of an output level adjustment system according to the present invention.
FIG. 23 is a block diagram showing a second basic configuration of the output level adjustment system according to the present invention.
FIG. 24 is a block diagram showing a third basic configuration of the output level adjustment system according to the present invention.
[Explanation of symbols]
1 ... Audio playback device
3. Operation unit
4. Control unit
5 ... Decoder
7 ... Equalizer (EQ1)
8 ... Equalizer (EQ2)
9 ... Loudness circuit
10 ... Electronic VOL
20 ... DSP
21 ... Adjustment value setting section
22 ... VOL value memory
23. Composition unit
24 ... Loudness pattern table
25 ... Loudness coefficient setting section
32 ... EQ pattern table (manual)
33 ... Manual EQ coefficient setting section
34. Composition unit
36 ... EQ pattern table (automatic)
37 ... EQ coefficient setting section for adjustment
50 ... Output level adjustment system
51. Discriminating means
52. Variable means
61 ... Identification means
62 ... Sound source discrimination means
63 ... Volume changing means
64. Original volume variable means
65. Fine adjustment means
66 ... Volume reflection variable means
67 ... Retraction means
71: Identification means
72: Discriminating means
73 ... Lifting means
74. First state variable means
75. Fine adjustment means
76. Second state variable means
77. Third state variable means
78. Frequency volume variable means
81. Identification means
82: Discriminating means
83 ... Lifting means
84 ... Calculation means
85 ... Pulling down means
86 ... State variable means

Claims (13)

In a playback device capable of playing back playback media recorded in various recording forms,
Discriminating means for discriminating whether the recording form of the reproduction medium is a first recording form recorded so as to produce a high reproduction volume or a second recording form recorded so as to produce a low reproduction volume. When,
Volume when the reproducing medium by said discriminating means performs a control to increase the volume only when it is determined that the second recording mode, the reproduction medium is judged to be the first recording mode And a sound volume varying means for maintaining the above. The volume changing means returns the playback volume to the volume before the volume increase control when the determining means determines that the second recording form is switched to the first recording form. Item 4. The playback device according to Item 1. An eject detecting means for detecting an eject operation of the reproduction medium;
3. The playback apparatus according to claim 1, wherein when the eject detection unit detects ejection of the playback medium, the volume changing unit returns the playback volume to the volume before the volume increase control . Having a volume adjusting means capable of adjusting the volume;
4. The volume changing unit according to claim 1, wherein when the reproduction volume is returned to a volume before volume increase control , the volume is returned to a volume reflecting an adjustment amount adjusted by the volume adjustment unit. The playback device according to one item. In a playback device capable of playing back playback media recorded in various recording forms,
Discriminating means for discriminating whether the recording form of the reproduction medium is a first recording form recorded so as to produce a high reproduction volume or a second recording form recorded so as to produce a low reproduction volume. When,
Wherein the playback medium by determination means performs control to enhance the frequency characteristics of the voice band only when it is determined that the second recording mode, the reproduction medium is judged to be the first recording mode reproducing apparatus comprising: the volume characteristic variable means for maintaining the frequency characteristic of the audio band, the when. When it is determined by the determining means that the playback medium has been switched from the second recording form to the first recording form, the volume characteristic varying means is configured to control the frequency characteristic before the frequency band enhancement control of the audio band. The playback apparatus according to claim 5, wherein An eject detecting means for detecting an eject operation of the reproduction medium;
7. The volume characteristic changing means returns the frequency characteristic to the frequency characteristic before the enhancement control of the frequency characteristic of the audio band when the ejection detecting means detects the ejection of the reproduction medium. Playback device. Having a frequency characteristic adjusting means capable of adjusting the frequency characteristic;
The sound volume characteristic variable means, when returning to the frequency characteristic before the enhancement control of the frequency characteristic of the voice band , returns to the frequency characteristic reflecting the adjustment amount adjusted by the frequency characteristic adjusting means. The reproduction | regeneration apparatus as described in any one of 5-7. Volume when the reproducing medium by said discriminating means performs a control to increase the volume only when it is determined that the second recording mode, the reproduction medium is judged to be the first recording mode The playback apparatus according to any one of claims 5 to 8, further comprising sound volume changing means for maintaining the above. The volume characteristic varying means performs control to enhance the frequency characteristic of the voice band to such an extent that output distortion does not occur ,
10. The playback apparatus according to claim 9, wherein the volume changing unit performs control to increase the volume by an amount that is insufficient for the frequency band frequency characteristic enhancement control by the volume characteristic changing unit. Calculating means for calculating the maximum change width of the frequency characteristic of the voice band;
6. The reproducing apparatus according to claim 5, further comprising pulling-down means for pulling down an equalizer gain or a loudness gain by the maximum change width. When the discriminating means discriminates that the reproduction medium is switched from the second recording form to the first recording form, the pulling-down means maintains a state in which the equalizer gain or the loudness gain is lowered. 12. The playback apparatus according to claim 11, wherein the volume characteristic changing unit returns the frequency characteristic to the frequency characteristic before the enhancement control of the frequency characteristic of the voice band.   The playback apparatus according to any one of claims 1 to 12, wherein the first recording form is linear PCM or MPEG2, and the second recording form is AC-3 or DTS. .

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