JP3788889B2 - Sound reproduction device and speaker device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sound reproducing device and a speaker device that are effective in an acoustic system that reproduces acoustic signals of two or more channels, such as a digital video disc (DVD) system and an audio system .
[0002]
[Prior art]
As a conventional digital audio system technique, there is a technique described in Japanese Patent Laid-Open No. 10-334650.
[0003]
FIG. 4 shows a schematic configuration of a sound reproduction system in the 5.1 channel compatible DVD player 1. A Dolby Digital (registered trademark) signal (5.1 channel) read from the DVD-format optical disk 2 is input to the signal processing circuit 3 to be amplified and input to the Dolby digital decoder 4. Here, decoding processing corresponding to the Dolby system is performed, and six decoded signals (L; left) (R; right) (C; center) (SL; rear left) (SR; rear right) (SW ; Subwoofer) is input to the configuration filter 5. The output of the configuration filter 5 is converted into an analog signal by the digital / analog converter 6 and supplied to the amplifier 10. The amplifier 10 ideally includes six speakers 22a, (L; left), 22b (R; right), 22c (C; center), 22d (SL; rear left), 22e (SR; rear). Right), 22f (SW; subwoofer) is connected.
[0004]
The microcomputer 8 controls operations of the signal processing circuit 3, the Dolby digital decoder 4, and the configuration filter 5 on the basis of information on the key input unit 7 and the disk.
[0005]
Here, Dolby Digital is a digital application of the Dolby Surround system, in which data for five basic channels L, R, C, SL, and SR are recorded on a digital disc such as a DVD. Some discs have data for the SW (subwoofer) channel having a low-frequency component called LFE in addition to the above basic five channels, but this component does not have the data amount for one channel. Therefore, what includes this as 0.1 channel is called Dolby Digital (5.1 channel).
[0006]
The addition of LFE is performed by a circuit called the configuration filter 5. As a result of the addition, the configuration filter 5 outputs six channels of L, R, C, SL, SR, and SW. If there is no LFE, the output is 5 channels excluding SW.
[0007]
Next, the configuration filter 5 will be described.
[0008]
A configuration filter is a filter that distributes low-frequency sounds to each speaker according to the individual system configuration such as the presence or absence of SW (subwoofer) speakers connected to the receiver and the size of L and R speakers. It is.
[0009]
That is, when there is a SW speaker, or when there is no SW speaker, when the L and R speakers have a large aperture and low frequency reproduction is possible, or when the aperture is small and low frequency reproduction is insufficient, low This is a filter that can appropriately change the distribution of the band components.
[0010]
5 to 8 show configuration examples of six types of configuration filters. FIG. 5 shows type A (suitable for small L and R speaker apertures) and FIG. 6 shows type B (suitable for large L and R speaker apertures and small LS, LR and C speaker apertures). In FIG. 7, it becomes type C-1 and type C-2 with or without a subwoofer. In FIG. 8, the selection state of the switch 67 is changed depending on whether the diameters of the L and R speakers are small or the type is D-2 or D-1. There is Type E as a type that outputs 6-channel inputs as they are.
[0011]
The configuration filter shown in FIG. 5 is a high-pass filter 31, 32, 33, 34, which passes L, C, R, LS, and LR outputs and outputs L, C, R, LS, and LR outputs. 35. The L, C, R, LS, and LR inputs and the LEF input are input to the adder 36. The adder 36 adds L, C, R, LS, and LR inputs at 0 decibels and LEF input at +10 decibels. The output of the adder 36 is derived as a subwoofer (SW) output through a low pass filter 37.
[0012]
6 includes an adder 41 to which an L input is supplied, a high pass filter 43 to which a C input is supplied, an adder 42 to which an R input is supplied, a high pass filter 44 to which an LS input is supplied, and an RS input. Is provided with a high pass filter 45, an adder 47 to which LEF input, C input, RS input, and LS input are supplied. The adder 47 adds C, LS, and RS inputs at 0 dB and LEF at −10 dB. The output of the adder 47 is further attenuated by 4.5 dB by the attenuator 48 via the low-pass filter 46 and input to the adders 41 and 42.
[0013]
7 includes an adder 51 to which an L input is supplied, a high-pass filter 52 and a low-pass filter 53 to which a C input is supplied, an adder 53 to which an R input is supplied, and a switch 55 to which an LFE input is supplied. , An adder 57 to which an LS input is supplied and an adder 58 to which an RS input is supplied.
[0014]
The output of the low-pass filter 53 is attenuated by 4.5 dB by the attenuator 54 and supplied to the adders 51 and 53. The adders 53 and 51 are supplied with one selection output of the switch 55. The output of the adder 51 is derived as an L output, and the output of the adder 53 is derived as an R output. The output of the previous high-pass filter 52 is derived as a C output.
[0015]
The other selected output of the switch 55 is amplified by the amplifier 56 and derived as the SW output. The LS input and the RS input are respectively input to adders 57 and 58, and are added to one output selected by the switch 55 here. The outputs of the adders 57 and 58 are derived as an LS output and an RS output.
[0016]
In the configuration filter of FIG. 8, the L input is input to the adder 61, the C input is derived through the high pass filter 62, and the R input is input to the adder 63. The LS input is derived through the high pass filter 64, and the RS input is derived through the high pass filter 65. The C input, RS and LS inputs are input to the adder 66 and added, and the added output is attenuated to −4.5 dB and then input to the switch 69 via the low-pass filter 68. One selection output of the switch 69 is input to the adders 61 and 63, and the other selection output is input to the adder 72 through the -10.5 dB attenuator. The adder 72 is supplied with an LFE input via an attenuator 71 of −5.0 dB. The output of the adder 72 is derived as a SW output.
[0017]
As described above, there are various types of configuration filters, and there are types that are adapted according to the setting state of the speaker system and the characteristics of the speaker.
[0018]
Returning to FIG. Specifically, the configuration filter 5 is one of the above six types, when there is no SW, type B, type C-1 (group A), or D-1 (when the playback device is a DVD). Is selected. If there is a switch, any of type A, type C-2 (group A) or type D-2 (when the playback device is a DVD) is selected. Here, the group A is a ranking of so-called digital audio systems. The group A means high performance, the group B is a popular product, and the group C is in-vehicle or portable. DVD is a configuration filter for DVD.
[0019]
FIG. 9 shows a preferable correspondence between the six types of configuration filters and the speakers. There is another type E, which is selected when the channels L, R, C, LS, and RS are full bands.
[0020]
[Problems to be solved by the invention]
As described above, there are appropriate types of configuration filters depending on the speaker system to be used (number of speakers, size, characteristics, etc.). Conventionally, the configuration filter type is selected and set by the user according to the situation.
[0021]
However, in this setting, the user needs to make a complicated setting according to the number, size, and characteristics of the speakers, which is complicated and troublesome for an unfamiliar user. Such factors hinder the spread of multi-channel speaker systems.
[0022]
Therefore, the present invention captures speaker information from a speaker to be used, and can automatically set the characteristics of the configuration filter to be optimal for the connected speaker, and the speaker device used here The purpose is to provide.
[0023]
[Means for Solving the Problems]
According to the present invention, a decoder for decoding the audio signals of a plurality of channels, and the configuration filter the output of the decoder is supplied, and a network interface for outputting the output of the configuration filter to the transmission line in a predetermined format, the Analyzing speaker information including arrangement information of individual speakers sent from the plurality of speakers connected to the transmission line so that the sound signals of the plurality of channels are adapted to the speaker. And means for setting characteristics of the configuration filter.
[0024]
The above means eliminates the need for the general user to set the configuration filter characteristics by looking at the situation of the plurality of speakers. In addition, even when the number of speakers is increased or decreased, it is possible to easily filter the sound signals of a plurality of channels so as to match the speaker environment.
[0025]
Further, the speaker device of the present invention includes a network interface, an analog conversion unit for data taken in via the interface, a speaker unit for acoustically converting the output of the analog conversion unit, a frequency response characteristic, and a minimum resonance frequency. And a characteristic data part including at least one of the number of speaker units, speaker unit size, arrangement position information, and the like, and means for sending data of the characteristic data part to the network via the interface.
[0026]
When the sound field environment is to be automatically set by the above means, the own characteristic information can be transmitted to the control unit of the center.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0028]
FIG. 1 shows an embodiment of the present invention. This is an example applied to a sound reproduction system in a 5.1 channel compatible DVD player, and its schematic configuration is shown. A Dolby Digital (registered trademark) signal (5.1 channel) read from the DVD-format optical disk 2 is input to the signal processing circuit 3 to be amplified and input to the Dolby digital decoder 4. Here, decoding processing corresponding to the Dolby system is performed, and six decoded signals (L; left) (R; right) (C; center) (SL; rear left) (SR; rear right) (SW ; Subwoofer) is input to the configuration filter 100. The output of the configuration filter 100 is input to the formatter 101 and is adjusted to the format of the transmission system. The data stream output from the formatter 101 is input to the network interface 103 and output to the transmission line 200.
[0029]
A speaker system is connected to the transmission line 200. This speaker system includes, for example, six speaker devices 201 (L; left), 202 (R; right), 203 (C; center), 204 (SL; rear left), 205 (SR; rear right), 206 (SW; subwoofer).
[0030]
The configuration of the speaker device of the present invention is configured as shown in FIG. 2, for example, which will be described later. From the speaker device, the data (speaker information) owned by the speaker device can be returned via the transmission line. Returning to FIG. 1, the speaker information is captured via the network interface 103, decoded by the deformer 104, and captured by the microcomputer 105. The microcomputer 105 analyzes the speaker information and sets the characteristics of the configuration filter 100 to characteristics that are optimal for the current situation.
[0031]
The microcomputer 105 controls the operations of the signal processing circuit 3 and the Dolby digital decoder 4 based on information on the key input unit 106 and the disk 2.
[0032]
In FIG. 2, one speaker device 201 will be described as a representative.
[0033]
The transmission line 200 is connected to the network interface 211. The network interface 211 separates and derives the data transmitted to its own speaker device and gives it to the digital / analog converter 212. The signal converted here is amplified as an audio output by the amplifier 213 and supplied to the speakers SP1 and SP2. A characteristic data unit 214 and a key input unit 215 are connected to the network interface 211.
[0034]
The characteristic data unit 214 stores speaker characteristic data. The characteristic data includes frequency response characteristics (total characteristics of all amplifier units and speaker units), minimum resonance frequency, number of speaker units, unit size of each speaker, and the like. Further, arrangement information (L, C, R, LS, LR) is given from the key input unit 215. From the key input unit 215, information may be input when the speaker device is upgraded, for example, when an additional speaker unit or an amplifier is changed. The speaker information is sent to the transmission line 200 via the network interface 211 when a request is received from the connected device via the transmission line, or when the speaker device is connected to the network. Information transmission can be appropriately performed in a format such as packet transmission, and a predetermined standard may be adopted.
[0035]
The above speaker information is taken into the network interface 103 of the terminal device of FIG. 1 from each speaker device via the transmission line 200. Speaker information from the network interface 103 is decoded by the deformator 104. Based on this information, the microcomputer 105 determines the current speaker environment and determines the filter type of the configuration filter 100 that is optimal for that environment.
[0036]
FIG. 3 is a flowchart for explaining the speaker information analysis operation.
[0037]
In step S1, it is determined whether there is a subwoofer (SW) speaker. Next, if there is a SW speaker, it is determined in step S2 whether the left (L) and right (R) speakers are large. If there is no SW speaker, it is determined in step S3 whether the rear left (LS) and right (RS) speakers are large.
[0038]
For example, the following method is used to determine the size of the speaker. The frequency value of the -3 dB point on the low frequency side of the frequency response characteristic is compared with the specified value, and if the value of the speaker device falls below the specified value, the speaker is determined to be a large speaker that can reproduce to the low frequency To do. Otherwise, it is determined that the speaker is a small speaker, and the process ends.
[0039]
Further, the frequency value of the −6 dB point on the high frequency side of the frequency response characteristic is compared with the specified value, and if the value of the speaker device is lower than the specified value, the speaker is determined to be SW. In other cases, it is determined that the speaker is for each channel. When the speaker size is determined from the frequency response characteristics, versatility may be imparted by using fuzzy theory.
[0040]
Further, instead of the frequency response characteristic, information on the minimum resonance frequency (f0) or the number of speaker units and each size may be used.
[0041]
Returning to FIG. If it is determined in step S2 that the L and R speakers are large, the configuration filter 100 is set to type A (step S7). If it is determined in step S2 that the L and R speakers are small, it is determined whether or not the playback device is a DVD (step S4). If the playback device is a DVD, the configuration filter 100 is set to type D-2 (step S5). If the playback device is not a DVD, the configuration filter 100 is set to type C-2 (step S6).
[0042]
If it is determined in step S3 that the LS and RS speakers are small, the configuration filter 100 is set to type B (step S11). If it is determined in step S3 that the LS and RS speakers are large, it is determined whether the playback device is a DVD (step S8). If the playback device is a DVD, the configuration filter 100 is set to type D-1 (step S9). If the playback device is not a DVD, the configuration filter 100 is set to type C-1 (step S10).
[0043]
As described above, according to the present invention, the characteristics of the configuration filter 100 can be automatically set even in a multi-channel speaker system.
[0044]
In the above system, the example of setting the characteristics of the configuration filter in the DVD player has been described. However, the device serving as the signal source is not limited to the DVD player. The concept of the present invention can be applied to various devices. The transmission line may be a coaxial cable, an optical cable, or wireless. In addition, various types of networks such as a serial type and a star type are selected. Depending on the transmission format, the transmission and reception modes of the interface are selected appropriately. In addition, the speaker information may be reacquired by transmitting a speaker information reset and recapture command from the key input unit 106, for example.
[0045]
【The invention's effect】
As described above, according to the present invention, there is provided a sound field reproduction environment automatic setting device capable of automatically setting a characteristic of a configuration filter to an optimum characteristic according to a speaker using the configuration filter, and the speaker device. be able to.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of the present invention.
FIG. 2 is a diagram illustrating the configuration of a speaker device according to an embodiment of the invention.
FIG. 3 is a flowchart shown for explaining the operation of the apparatus of the present invention.
FIG. 4 is an explanatory diagram of a speaker system in a DVD player.
FIG. 5 is a diagram showing a configuration filter type A;
FIG. 6 is a diagram showing a configuration filter type B;
FIG. 7 is a diagram showing configuration filter types C1 and C2.
FIG. 8 is a diagram showing configuration filter types D1 and D2.
FIG. 9 is a diagram showing an example of a configuration filter type and a speaker system corresponding to the configuration filter type;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 ... Configuration filter, 101 ... Formatter, 103 ... Network interface, 104 ... Deformatter, 105 ... Microcomputer, 106 ... Key input part, 200 ... Transmission line, 201-205 ... Speaker apparatus.

Claims (6)

A decoder for decoding a multi-channel acoustic signal;
A configuration filter to which the output of the decoder is supplied;
A network interface for outputting the output of the configuration filter to a transmission line in a predetermined format;
By analyzing speaker information including arrangement information of individual speakers sent from the plurality of speakers connected to the transmission line through the transmission line, the acoustic signals of the plurality of channels are adapted to the speaker. the sound reproducing apparatus characterized by comprising a means for setting the characteristics of the configuration filter. The speaker information is returned in response to a request output from the network interface, or is sent via the transmission line when the speaker is connected to the network interface. The sound reproducing device according to 1.   The sound reproduction apparatus according to claim 1, wherein the transmission line is a serial network.   The sound reproduction apparatus according to claim 1, wherein the transmission line is a star-type network. 2. The sound reproducing apparatus according to claim 1, wherein the transmission line is a composite network of a star type and a series type. A network interface;
An analog conversion unit for data taken in via the network interface;
A speaker unit that acoustically converts the output of the analog conversion unit;
A characteristic data part including at least one of frequency response characteristics, minimum resonance frequency, number of speaker units, speaker unit size, arrangement information, and the like;
Means for outputting the data in the characteristic data section as speaker information to the transmission line via the network interface.

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