JP2002369299A - Audio reproduction system and dvd player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a user who uses a DVD player, having an SACD(super audio CD) reproduction function to enjoy complete sounds of both SACD and DVD under an environment of a single speaker, and to release the user from the troublesomeness of setting the speakers. SOLUTION: The system is constituted in a manner such that different speakers can be automatically set, depending on reproduction of an SACD disk or a DVD disk, and that a means of identifying an SACD disk from a DVD disk is provided and different speakers are set automatically, depending on the types of disks.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an audio reproducing apparatus and a DVD player, and more particularly to a SAC capable of reproducing both a DVD (digital versatile disk) and an SACD (super audio CD).
The present invention relates to a DVD player with a D playback function, and particularly to a speaker setting.

[0002]

2. Description of the Related Art Hitherto, DVD players have been widely used as multi-channel music players.

[0003] FIG. 6 shows a conventional DV system used in a general home.
4 shows an example of a speaker arrangement of a D player. In FIG. 6, large front speakers L and R are installed at the left and right front of the listening position A of the viewer, respectively.
Large rear speakers Ls, Rs on the left and right rear respectively
Is installed. Center speaker C in front center
Is installed.

The speakers L, R, Ls, and Rs are large speakers capable of outputting wide-band (all-band) sound, while the center speaker C can output narrow-range (middle-high band) sound. It is a small speaker. The reason why the center speaker C is small is that at home, a TV (television receiver) is arranged at a central position in front of the listening position A of the viewer, so that large speakers such as left and right speakers cannot be used. . In general, large speakers L, R, Ls,
Rs can reproduce the entire band of the signal of the corresponding channel, but the small center speaker C cannot reproduce the bass range of the center channel.

[0005] In order for a viewer to completely reproduce music data recorded on a DVD and enjoy music, a DVD player assigns each speaker to an appropriate sound range in a given speaker environment, and the entire sound range is completely completed. So-called loudspeaker setting must be performed so that the signal is output to the speaker.

For this purpose, the DVD player has a function of allowing a viewer to manually input and display a speaker environment.

FIG. 7 shows a display example of a speaker environment as shown in FIG. 7 provided in a DVD player.
This display shows the speaker environment on the television screen by connecting the video output terminal of the DVD player to the external input terminal of the television.

In FIG. 7, front speakers (L,
R) is large (speaker for full-band reproduction) or small (speaker for middle-high band reproduction), center speaker is large, small, or none, and surround speakers (rear speakers Ls, Rs) are The three alternatives of large, small, and no, and the subwoofer can perform the alternative of yes or no.

When the speaker environment is input as described above, the low-frequency component of the center channel is equally distributed to the left and right front speakers L and R in the DVD player, so that the low-frequency component is not lost as a whole. Thus, signal processing for speaker setting is performed. Therefore, there is no problem when enjoying a movie on a DVD player.

Recently, SACD (Super Audio C)
D) A DVD player with a playback function was developed. SA
A CD has a physical structure similar to that of a DVD and has the same reproduction method as a DVD, so that a SACD can be reproduced by a DVD player. However, when viewing a SACD on a DVD player with an SACD playback function, the above-described conventional speaker setting is often inconvenient for the following reasons.

[0011] The SACD has been developed as a medium for realizing higher quality music reproduction than a CD (compact disk). SACD has the same disk diameter as CD (12c
m), disc thickness (1.2 mm), and single-sided reproduction method, but the encoding method is different. That is, the sampling frequency of a CD is 44.1 KHz, and the number of quantization bits is 1
In contrast to the 6-bit coding method using the linear PCM method, the SACD has a sampling frequency of 2.8224 MHz, which is 64 times the CD, and the number of quantization bits is 1 bit. That is, the encoding system employs a direct stream digital (DSD) system in which a wide band is directly converted into 1-bit digital data using a ΔΣ modulation circuit. Therefore, the data amount is four times as large as that of the CD, and the quantization noise is small and the sound quality is high.

However, SACD differs from DVD in that the reproduction frequency range is DC to 100 KHz or more. DVD Dolby Digital 5.1c
In the case of h (multi-channel), the upper limit frequency that can be reproduced is 20 KHz (reproduction frequency range is DC to 20 KHz), whereas SACD has a frequency band extending to 100 KHz (reproduction frequency range is DC to 100 KHz or more). This is a major reason why the above speaker setting is inconvenient when reproducing a SACD with a DVD player having a SACD reproduction function.

Of course, the center speaker is 100 kHz
There is no problem if it is a small speaker that can reproduce even high frequencies up to. However, DVD-compatible center speakers only have a reproduction capability up to about 20 KHz, and are not suitable for SACD.

Therefore, in order to enjoy the SACD on a DVD player with a SACD playback function, it is better to distribute the center channel signal equally to the left and right front speakers L and R without the center speaker. .

[0015]

However, the SAC
For a user who uses a DVD player with a D playback function, it is very troublesome to change speaker settings each time the type of disc to be viewed is different when actually using it.

According to the present invention, in order to eliminate the inconvenience of the user, different speaker settings can be made at the time of SACD playback and DVD playback, respectively. There is a problem in providing a DVD player that sets speaker settings according to the type.

[0017]

In order to solve the above-mentioned problems, an audio reproducing apparatus and a DVD player according to the present invention have the following configurations.

(1) There are provided reproducing means capable of reproducing at least two types of compact discs having different reproduction frequency bands, and speaker setting means for setting a speaker configuration in accordance with the type of the compact disc to be reproduced. Audio playback device. (2) The audio reproducing apparatus according to (1), wherein the compact discs having different reproduction frequency bands are a compact disc having a reproduction frequency band of 20 kHz and a compact disc having a reproduction frequency band of 100 kHz. (3) The audio reproducing apparatus according to (1), wherein the speaker setting unit selects a preset speaker configuration and performs speaker setting. (4) When a compact disc having a reproduction frequency band of 100 kHz is reproduced, the audio signal to the center speaker composed of middle and high band reproduction speakers is composed of full-band reproduction speakers when a compact disc having a reproduction frequency band of 100 kHz is reproduced. (3) The audio reproducing device according to (3), wherein the audio reproducing device is set so as to be distributed to the front speakers. (5) The speaker setting means outputs a predetermined audio signal from the speaker, detects the level of the audio signal output from the speaker, and determines the presence or absence and type of the speaker. The audio playback device according to (1), wherein the speaker setting is performed by combining the following.

(6) D having a reproduction frequency band of 20 kHz
A reproducing means capable of reproducing both a VD (digital versatile disk) and a SACD (super audio CD) having a reproducing frequency band of 100 kHz, and a reproducing means for reproducing the SACD and a DVD. A speaker setting means for setting different speaker settings. (7) The speaker setting means sets, when reproducing the SACD, such that an audio signal output to a center speaker constituted by middle and high band reproduction speakers is distributed to a front speaker constituted by full band reproduction speakers. The DVD player according to (6). (8) The DVD player according to (6), wherein the speaker setting means selects a speaker configuration set in advance and sets a speaker. (9) The speaker setting means outputs a predetermined audio signal from the speaker, detects the level of the audio signal output from the speaker, and determines the presence or absence and type of the speaker. The DVD player according to (6), wherein speaker settings are made by combining the following.

As described above, in the audio reproducing apparatus and the DVD player capable of reproducing different types of compact discs (DVD and SACD), the speaker setting adapted to the compact disc to be reproduced can be used for the compact disc. A speaker environment can be easily realized.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of an audio reproducing apparatus and a DVD player according to the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, a DVD player embodying an audio reproducing apparatus includes a reproducing section 40 for reproducing a compact disc, an audio output control section 50 for controlling an audio signal, and a speaker section for outputting an audio signal. And a display unit 70 for displaying an image or the like when a compact disc is reproduced is a television receiver or the like. The configuration related to video is omitted, and the display unit 70 differs depending on the DVD player, and may be configured to be combined with the player or may be configured separately.

The playback unit 40 is a SAC for playing SACDs.
D playback unit 41 and DVD playback unit 42 for playing DVDs
And a CD playback unit 43 for playing back a CD.
It may be composed of a reproducing unit 41 and a DVD reproducing unit 42.

The audio output control unit 50 includes an audio output unit 51 that outputs an audio signal to the speaker unit 60,
And a speaker setting section 52 for setting a speaker. The speaker setting unit 52 has a configuration in which different speaker settings can be set for the SACD and the DVD to realize a speaker environment compatible with the SACD.
This will be described later.

In the embodiment, the speaker section 60 is located at a front position with respect to a listening position (not shown) and includes a pair of left and right front speakers 61 and a front position with respect to the listening position. It comprises a center speaker 62 disposed at the position of the display unit 70 of the device, etc., a surround speaker 63 comprising a pair of left and right speakers at a position rearward of the listening position, and a subwoofer 64 for producing heavy bass. Note that not all of them are required, and at least the front speaker 61 and the center speaker 62 are necessary.

The speaker setting in the speaker setting section 52 selects a configuration in which speaker settings have been made in advance according to the type of the compact disc.

For example, as shown in FIG. 2, in the case of SACD reproduction, "2" is selected from speaker settings "1" or "2", and in the case of DVD reproduction, speaker setting "1" or "2". Of the speaker setting "1" or "2" in the case of CD playback.

FIG. 3A is an example showing the speaker configuration of the speaker setting “1”, and FIG. 3B is an example showing the speaker configuration of the speaker setting “2”. In FIG. 3A and FIG. 3B, characters surrounded by squares indicate the speaker setting status.

That is, the speaker setting “1” in FIG.
Shows the speaker settings for DVD.
Both the front speaker 61 and the surround (rear) speaker 63 are large speakers, the center speaker 62 is a small speaker, and the subwoofer 64 is absent.

On the other hand, in the case of the SACD shown in FIG. 3B, the front speaker 61 and the surround (rear) speaker 63 are both large speakers, the center speaker 62 is absent, and the subwoofer 64 is absent.

As described above, if the center speaker 62 is not set and the front speaker 61 is set to be large, the audio signal output from the center speaker 62 is distributed to the front speaker 61 and output.

FIG. 4 shows that the speaker setting unit 52
FIG. 5 shows an embodiment of a circuit for automatically determining the presence / absence of a speaker and the size of the speaker as a pre-stage for setting a speaker.

In FIG. 4, the output terminals of the 1 kHz sine wave generator 1 and the 100 Hz sine wave generator 2 are connected to the input terminals 3a and 3b of the changeover switch 3, respectively.

The change-over switch 3 is controlled by a control signal 7a from a microcomputer 7 described later to control the input terminal 3a or 3
b is connected to the output terminal 3c.

The output terminal 3c of the changeover switch 3 is connected to the input terminal 4a of the selection switch 4. The selection switch 4 is controlled by a control signal 7b from the microcomputer 7 to connect the input terminal 4a to the output terminals 4b, 4c, 4d, 4e, 4e.
Connect to one of g.

The output terminals 4b to 4g of the selection switch 4 are
Each of the switches 5L to 5sub is connected to one of the input terminals (each denoted by a) in a one-to-one correspondence. The main lines (reproduction outputs) of the corresponding channels are connected to the other input terminals of the changeover switches 5L to 5sub in a one-to-one correspondence.

The output terminals of the changeover switches 5L to 5sub are connected to the line output terminals 6L to 6sub of each speaker. The changeover switches 5L to 5sub operate under control of a control signal from the microcomputer 7, and have a function of switching each of the line outputs 6L to 6sub to a signal from the main line or a signal from the selection switch 4.

Each of the line output terminals 6L to 6sub is connected to a corresponding speaker (the above L, R, etc.) via an amplifier (not shown). For example, in the case of the L channel, when a normal DVD is reproduced, the L channel component appears on the main line.
The reproduced signal of L channel is output from L. As a result, the sound of the L channel is output from the speaker L.

The circuit shown in FIG. 4 for automatically determining the presence or absence of a speaker includes a microcomputer 7, an amplifier (amplifier) 8, a 1 kHz band-pass filter (BPF) 9,
A discrimination circuit including a 00 Hz low-pass filter (LPF) 10, a level detector 11, and a microphone 12 is provided.

The microphone 12 is set at the listening position A (see FIG. 6 of the prior art). The output of the microphone 12 is connected to the input terminal of the amplifier 8. Amplifier 8
Output terminals are 1KHz BPF9 and 100Hz LPF10
Are commonly connected to the respective input terminals.

1 KHz BPF 9 and 100 Hz LPF 1
The output terminal of 0 is connected to the input terminals 11a and 11b of the level detector 11, respectively. The output terminal of the level detector 11 is connected to the input terminal of the microcomputer 7.

The circuit having the above structure for automatically determining the presence or absence and the size of the speaker operates as follows.

In both the case of determining the presence or absence of a speaker and the case of determining the size of a speaker, the changeover switches 5L to 5L are controlled by the control signal 7c from the microcomputer 7.
5 sub is moved to the input terminal a side. Thereby, the output of the speaker becomes the output from the 1 KHz sine wave generator 1 or the 100 Hz sine wave generator 2.

When determining the presence or absence of a speaker, the microcomputer 7 controls the output of the changeover switch 3 to be connected to the output 3a of the 1 KHz sine wave generator 1 by a control signal 7a. Next, the microcomputer 7 sequentially switches the output of the selection switch 4 in the order of 4b → 4c →... → 4g. Thus, a 1 KHz sine wave sound is sequentially generated from each speaker.

The sound of each speaker is picked up by the microphone 12 and input to the input terminal 11a of the level detector 11 via the amplifier 8 and the 1 kHz BPF 9. Level detector 11
Sends a "speaker present" signal to the microcomputer 7 if the input signal at the input terminal 11a is equal to or higher than a predetermined level.
When receiving the “speaker present” signal, the microcomputer 7 determines that the speaker corresponding to the position of the selection switch 4 is “present”.

To determine the size of the speaker, control is performed so that the output of the changeover switch 3 is connected to the output 3b of the 100 Hz sine wave generator 2. Next, the microcomputer 7 sequentially switches the output of the selection switch 4 in the order of 4b → 4c →... → 4g. Thereby, a 100 Hz sine wave sound is sequentially generated from each speaker.

The sound of each speaker is picked up by the microphone 12 and input to the input terminal 11 b of the level detector 11 via the amplifier 8 and the 100 Hz LPF 10. Level detector 1
1 sends a "speaker small" signal to the microcomputer 7 if the input signal of the input terminal 11b is below a predetermined level.

When receiving the "speaker small" signal, the microcomputer 7 determines that the speaker corresponding to the position of the selection switch 4 is "small". The microcomputer 7 sends the determination result of the presence or absence of the speaker and the size of the speaker as display data to the main body of the DVD and displays it on the TV screen.

Next, an automatic speaker setting circuit in the speaker setting section will be described with reference to FIG.

In FIG. 5, for simplicity of explanation, L
Only the channels, C channels, and R channels are shown.

Switch group 5 of automatic speaker setting circuit
Are shared with the circuit shown in FIG. 4 for automatically determining the presence / absence and size of the speaker. When each of the switches 5L to 5sub of the switch group 5 is tilted to the b side, this automatic speaker setting circuit functions.

In FIG. 5, the main line Lch is an output line from the L-channel decoder in the DVD player.
The main line Cch is an output line from the decoder for the center channel in the DVD player. The main line Rch is D
This is an output line from the decoder for the R channel in the VD player.

The main line Lch is connected to one input terminal of the adder 20. The output terminal of the adder 20 is 100 Hz
It is connected to the input terminal of a high-pass filter (HPF) 21 and to one input terminal 22 a of the changeover switch 22. The other input terminal 22 of the changeover switch 22
b is connected to the output terminal of the 100 Hz HPF 21. The output terminal 22 c of the changeover switch 22 is connected to one input terminal of the adder 23.

The other input terminal of the adder 23 is connected to one terminal 27a of the on / off switch 27. The output terminal of the adder 23 is connected to the input terminal b of the changeover switch 5L.

The main line C is connected to the input terminal of the 100 Hz HPF 24 and one input terminal 25 a of the changeover switch 25. The output terminal of the 100 Hz HPF 24 is connected to the other input terminal 25 b of the changeover switch 25.

The output terminal 25c of the changeover switch 25 is connected to the input terminal of the attenuator 26 having the function of attenuating the input signal by 4.5 dB, the b-side input terminal of the changeover switch 5C, and the output terminal of the attenuator 26. Have been. The output terminal of the attenuator 26 is also connected to the other terminal 27b of the on / off switch 27.
And one terminal 28a of the on / off switch 28.

The main line C is connected to an input terminal of a 100 Hz low-pass filter (LPF) 29. 10
The output terminal of the 0 Hz LPF 29 is connected to the input terminal of the attenuator 30 having a 4.5 dB attenuation function. Attenuator 3
0 output terminal is one terminal 31 of the on / off switch 31.
a and one terminal 32 a of the on / off switch 32.

The main line Rch is connected to one input terminal of the adder 33. The other input terminal of the adder 33 is connected to the terminal 32b of the on / off switch 32. The output terminal of the adder 33 is connected to the input terminal of the 100 Hz HPF 34 and to one input terminal 35 a of the changeover switch 35. The other input terminal 35 b of the changeover switch 35 is connected to the output terminal of the 100 Hz HPF 34.

The output terminal 35c of the changeover switch 35 is connected to one input terminal of the adder 36. The other input terminal of the adder 36 is the terminal 2 of the on / off switch 28.
8b. The output terminal of the adder 36 is connected to the b-side input terminal of the changeover switch 5R.

The switches 22, 25, 27, 28, 31,
32 performs an on / off operation or a switching operation in response to a control signal from the microcomputer 7. When receiving the disc identification signal from the DVD player body, the microcomputer 7 determines a combination of switch control signals corresponding to the disc type.
The speaker setting mode is determined by the combination of the switch control signals. The microcomputer 7 sends a display signal representing the speaker setting mode to the DVD main body and displays the signal on the TV screen.

The automatic speaker setting circuit having such a configuration operates as follows. When all of the speakers L, R, and C are determined to be “large”, the microcomputer 7 pushes the changeover switches 22, 25, and 35 to the a side while keeping the on / off switches 27, 28, 31, and 32 open.
At this time, audio signals in all bands from the main lines Lch, Rch, and C are output from the speakers L, C, and R as they are.

When the front speakers L and R are determined to be “small”, the microcomputer 7 switches the switches 22 and 3
5 to 22b, 35b side, 100Hz HPF2
By inserting 1, 34, the low-frequency signal has an output of 6L,
Do not get out of 6R.

When the microcomputer 7 determines that the front speakers L and R are “large” and the center speaker C is “small”, the microcomputer 7 tilts the changeover switch 25 to the side 25b and
By inserting the 0 Hz HPF 24, low-frequency signals are not output from the C channel output 6C, and the on / off switches 31, 32 are closed. As a result, the low-frequency signal component included in the main line C passes through the 100 Hz LPF 29 and is further attenuated by 4.5 dB in the attenuator 30, and then to the adder 20 via the on / off switch 31 and to the adder 20 via the on / off switch 32. Are added to the adder 33 respectively.
Thus, when the center speaker C is small, C
The low-frequency component of the channel signal is distributed to the signals of the main lines Lch and Rch.

The microcomputer 7 includes front speakers L, R
Is "large" and the center speaker C is determined to be "absent", the switch 25 is moved to the side 25a, the on / off switches 27 and 28 are closed, and the on / off switch 3 is turned off.
Open 1, 32. As a result, the signal from the main line C is attenuated by 4.5 dB by the attenuator 26, and then the on / off switch 27,
, And are added to adders 23 and 36 via.
Thus, when there is no center speaker C, C
Channel signals are distributed to the signals of the main lines Lch and Rch.

As described above, when reproducing the SACD, the audio signal output to the center speaker 62 is distributed to the front speaker 61, so that the audio output of the sound range that cannot be handled by the center speaker 62 is output to the front speaker. Since the data can be output at 61 and the settings can be made automatically, an audio playback device and a DVD player that are extremely operable and easy to use can be realized.

[0066]

As described above, the speaker settings of the audio playback device and the DVD player according to the present invention are different between when playing a DVD and when playing a SACD, and are set to be adapted to the respective settings. Therefore, there is an effect that an audio signal suitable for the speaker environment can be output in both cases of SACD and DVD by eliminating the troublesome setting of the speaker as in the related art.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing a DVD player embodying an audio reproducing apparatus according to the present invention.

FIG. 2 is an explanatory diagram showing an embodiment of display of speaker settings of a DVD player with a SACD playback function according to the present invention.

FIG. 3 is an explanatory diagram showing an example of a display of a speaker setting mode in the embodiment.

FIG. 4 is a circuit diagram of the speaker presence / absence discrimination device in the embodiment.

FIG. 5 is a circuit diagram of an automatic speaker setting circuit in the embodiment.

FIG. 6 is an explanatory diagram showing a speaker arrangement of five channels.

FIG. 7 is an explanatory diagram showing a state of speaker setting in the related art.

[Explanation of symbols]

1: 1 KHz sine wave generator, 2: 100 Hz sine wave generator, 3: switch, 4: select switch, 5: switch, 6: output terminal, 7: microcomputer, 8: amplifier,
9: 1 KHz BPF, 10: 100 Hz BPF, 11:
Level detector, 12: microphone, 20, 23, 33, 3
6: adder, 21, 24, 34: high-pass filter, 2
2, 25, 35: changeover switch, 26, 30: attenuator,
27, 28, 31, 32: on / off switch, 34: low-pass filter, A: listening position, L, R,
C, Ls, Rs: speaker, 40; playback unit, 41; S
ACD playback section, 42; DVD playback section, CD playback section, 5
0: audio output control unit, 51: audio output unit,
52; speaker setting section, 60; speaker section, 61;
Front speaker, 62; Center speaker, 6
3; surround speakers, 64; subwoofer, 7
0: display unit.

Claims (9)

[Claims] 1. A reproducing apparatus comprising: reproducing means for reproducing at least two types of compact discs having different reproduction frequency bands; and speaker setting means for setting a speaker configuration according to the type of the compact disc to be reproduced. Audio playback device. 2. The audio reproducing apparatus according to claim 1, wherein the compact discs having different reproduction frequency bands are a compact disc having a reproduction frequency band of 20 kHz and a compact disc having a reproduction frequency band of 100 kHz. 3. The audio reproducing apparatus according to claim 1, wherein the speaker setting means performs speaker setting by selecting a preset speaker configuration. 4. The preset speaker configuration is as follows:
When a compact disc having a reproduction frequency band of 100 kHz is reproduced, the audio signal to the center speaker composed of the middle and high band reproduction speakers is set to be distributed to the front speaker composed of the full band reproduction speakers. The audio playback device according to claim 3, wherein the audio playback device is configured. 5. The speaker setting means outputs a predetermined audio signal from a speaker, detects the level of the audio signal output from the speaker, and determines the presence or absence and type of the speaker. The audio reproducing apparatus according to claim 1, wherein the speaker setting is performed by combining the speakers. 6. A DVD having a reproduction frequency band of 20 kHz.
(Digital Versatile Disk) and SACD (Super Audio C) with a playback frequency band of 100 kHz.
D), and speaker setting means for setting different speaker settings when playing the SACD and when playing the DVD, respectively. DVD player. 7. The speaker setting means,
7. The DVD according to claim 6, wherein, when D is reproduced, an audio signal to be output to a center speaker constituted by middle and high band reproduction speakers is set to be distributed to a front speaker constituted by full band reproduction speakers.
player. 8. The DVD player according to claim 6, wherein the speaker setting means selects a speaker configuration set in advance and sets a speaker. 9. The speaker setting means outputs a predetermined audio signal from a speaker, detects the level of the audio signal output from the speaker, and determines the presence or absence and type of the speaker. The DVD player according to claim 6, wherein the speaker setting is performed by combining the speakers.