JP2004048258A - Acoustic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of a conventional acoustic device that has caused an unsatisfactory speaker output when an output characteristic of a speaker is not compatible with an acoustic characteristic of an acoustic signal even in the case that the acoustic characteristic of the acoustic signal is variable. <P>SOLUTION: The acoustic device includes: an operation section 16 for selecting and setting a 5.1ch mode or a 6ch mode and setting a speaker with a different output characteristic from each mode; a DSP section 15 for revising the characteristic of the acoustic signal when the 5.1ch mode is set and outputting the acoustic signal whose characteristic is revised to each speaker; and a microcomputer 18 that controls the DSP section 15 to apply mute control to the acoustic signal from a first output 120A connected to a speaker whose output characteristic is discriminated not to be compatible with the acoustic characteristic of the acoustic signal when discriminating that the output characteristic of the speaker set at present is not compatible with the acoustic characteristic of the acoustic signal whose characteristic is revised in a mode set at present. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, for example, the acoustic characteristics of an audio signal are changed in accordance with the output characteristics of a speaker connected to an output channel of 6 channels (hereinafter simply referred to as ch) or 5.1 channels, and these changed audio signals are output. For example, the present invention relates to an audio device such as an in-vehicle audio device provided with an acoustic characteristic changing unit such as a DSP for outputting sound from different speakers.
[0002]
[Prior art]
Such a conventional stereo sound system for a vehicle-mounted audio apparatus includes, for example, a front Lch / Rch (hereinafter simply referred to as L / R), a rear L / R, a subwoofer (hereinafter simply referred to as SW) L / R (or Non-fader L / R) 6-channel system with 6-channel RCA output terminals and 5.1-channel RCA output terminals for front L / R, rear L / R, subwoofer, and center (hereinafter referred to as CENTER). 5.1 channel system provided.
[0003]
The difference between the 5.1ch system and the 6ch system lies in the acoustic characteristics of acoustic signals output from the first output and the second output which are two outputs other than the four outputs of the front L / R and the rear L / R. In the case of a system, an acoustic signal for SW-Lch and an acoustic signal for SW-Rch are output, and in the case of a 5.1ch system, an acoustic signal for center and an acoustic signal for SW are output.
[0004]
In other words, in the case of a 5.1-channel output in a vehicle-mounted audio device, a function of changing the first output and the second output into audio signals for SW and CENTER is required, so that, for example, a Dolby Pro An acoustic characteristic changing program such as Logic II (R) is used.
[0005]
Therefore, in the in-vehicle audio device, the 5.1ch output and the 6ch output have different acoustic characteristics of the acoustic signals of the respective channels. Therefore, both the 5.1ch output and the 6ch output are not shared. It has also been proposed to share a 5.1ch output and a 6ch output.
[0006]
As described above, the on-vehicle audio device sharing the 5.1ch and 6ch outputs is provided with a function of turning on / off an acoustic mode such as Dolby Pro Logic II, for example. When the acoustic mode is ON, the 5.1ch output is provided. Is changed to the acoustic characteristic of the acoustic signal corresponding to the audio signal, and when the acoustic mode is OFF, the acoustic characteristic is changed to the acoustic characteristic of the acoustic signal corresponding to the 6ch output. Therefore, it is possible to support the 5.1ch output and the 6ch output. .
[0007]
[Problems to be solved by the invention]
However, according to the above-described conventional on-vehicle audio device, the sound mode can be switched between the 5.1-channel output and the 6-channel output by turning on / off the acoustic mode. When the sound mode is turned on even though the low-frequency output speaker, ie, the SW-Lch or Rch speaker, is connected, one of the first output and the second output is used to output the CENTER sound for the entire band. Although the signal is output, the speaker for SW-Lch or Rch does not correspond to the acoustic characteristic of the acoustic signal for CENTER, and therefore cannot satisfy the acoustic output of the acoustic signal in the middle and high range.
[0008]
Similarly, for example, in the case of 5.1ch output, if the acoustic mode is OFF, that is, 6ch output, regardless of whether a CENTER speaker is connected to the first output or the second output, the first output and the second output are output. Although an acoustic signal for SW is output from the two outputs, a small-diameter CENTER speaker does not correspond to the acoustic characteristics of the acoustic signal for SW. In addition to the above, there is a possibility that the sound of the CENTER speaker itself may be broken due to cracking or distortion of the sound.
[0009]
That is, according to the above-described conventional on-vehicle audio device, even if the acoustic mode can be switched, if the acoustic characteristic of the acoustic signal corresponding to each acoustic mode does not correspond to the speaker output characteristic actually connected. , It cannot provide comfortable sound output.
[0010]
In view of the above, the present invention has been made in view of the above points, and an object of the present invention is to provide a comfortable sound output even when the sound characteristics of the sound signal do not correspond to the output characteristics of a speaker to be actually connected. An object of the present invention is to provide an audio device that can be provided.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, an audio apparatus according to the present invention comprises: a mode setting means for setting an acoustic mode; and changing an acoustic characteristic of an audio signal based on the acoustic mode set by the mode setting means. An acoustic device having an acoustic characteristic changing unit that outputs a signal to an acoustic output terminal, comprising: a speaker output characteristic setting unit configured to set an output characteristic of a speaker connected to the acoustic output terminal; Characteristic determining means for determining whether or not the set output characteristic of the speaker corresponds to the acoustic characteristic of the acoustic signal changed by the acoustic characteristic changing means; If it is determined that the sound signal does not correspond to the sound characteristic of the sound signal changed by the changing unit, the output of the sound signal output to the sound output terminal is muted. And to have a chute controller.
[0012]
Therefore, according to the audio device of the present invention, when it is determined that the output characteristic of the connected speaker does not correspond to the acoustic characteristic of the acoustic signal changed by the acoustic characteristic changing unit, the acoustic output connected to the speaker is determined. Since the output of the audio signal output to the terminal is muted, the acoustic characteristics of the audio signal do not correspond to the output characteristics of the speaker to which they are connected. It is possible to reliably prevent unsatisfactory sound output caused by the absence of the sound signal, and to provide a comfortable sound signal.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an in-vehicle audio device showing an embodiment of an audio device of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration inside a vehicle-mounted audio device according to the present embodiment.
[0014]
In FIG. 1, the on-vehicle audio device 10 can support both 6-channel output and 5.1-channel output, and outputs four outputs to the front L / Rs 111A and 111B, rear L / Rs 112A and 112B, and outputs the first output 120A and the first output 120A. An electronic volume unit 11 having a 2-output 6-channel RCA output terminal with 2 outputs 120B, a CD mechanism unit 12 for reproducing and outputting an audio signal recorded on a recording medium such as a CD, and receiving an incoming radio broadcast A radio tuner unit 13, a selector unit 14 for switching and selecting the outputs of the CD mechanism unit 12 and the radio tuner unit 13, and a DSP unit 15 for performing various digital signal processing on signals selectively output from the selector unit 14 , An operation unit 16 for inputting various commands, a display unit 17 for displaying various information, And a microcomputer 18 for controlling the whole.
[0015]
The DSP unit 15 further includes, for example, an A / D conversion unit 15A that digitally converts an audio signal reproduced and output by the CD mechanism unit 12, a DSP processing unit 15B that performs an acoustic characteristic process on the digitally converted audio signal, A D / A converter 15 </ b> C for converting the acoustic signal subjected to the acoustic characteristic processing into analog data is transmitted to the electronic volume unit 11.
[0016]
The operation unit 16 has, for example, a function of switching the sound mode of the Dolby Pro Logic II to ON / OFF (5.1 ch mode / 6 ch mode) and a function for 5.1 ch (CENTER / SW) or 6 ch (SW-L / R) has a function to switch and set speaker settings.
[0017]
FIG. 2 is an explanatory diagram briefly showing the speaker output state based on the setting relationship between the speaker and the acoustic mode ON / OFF.
[0018]
FIG. 2A shows a case where the acoustic mode is OFF (6ch mode) and the speaker setting is for 6ch (SW-L / R), that is, a normal speaker output state with 6ch output. A sound signal for SW-Lch is output from the first output 120A connected to the speaker, and a sound signal for SW-Rch is output from the second output 120B connected to the speaker for SW-Rch.
[0019]
FIG. 2B shows a case where the acoustic mode is ON (5.1ch mode) and the speaker setting is for 6ch (SW-L / R), that is, the acoustic characteristic does not correspond to the output characteristic of the set speaker. , And mutes the CENTER sound signal that should be output from the first output 120A connected to the SW-Lch speaker, and switches SW from the second output 120B connected to the SW-Rch speaker. Is output.
[0020]
FIG. 2C shows a case where the sound mode is OFF (6ch mode) and the speaker setting is for 5.1ch (CENTER / SW), that is, the sound characteristics do not correspond to the output characteristics of the set speaker. A speaker output state is shown, an audio signal for SW-Lch that should be output from the first output 120A connected to the CENTER speaker is muted, and a SW-Rch audio signal is output from the second output 120B connected to the SW speaker. An acoustic signal will be output.
[0021]
FIG. 2D shows the case where the acoustic mode is ON (5.1 ch mode) and the speaker setting is for 5.1 ch (CENTER / SW), that is, the normal speaker output state at 5.1 ch output. A sound signal for CENTER is output from the first output 120A connected to the speaker for sound, and a sound signal for SW is output from the second output 120B connected to the speaker for SW.
[0022]
FIG. 3 is an explanatory diagram of a table that briefly shows the output contents of the first output 120A and the second output 120B based on the setting relationship between the speaker and the sound mode ON / OFF.
[0023]
As shown in FIG. 3, for example, when the sound mode is ON (5.1 ch mode) and the speaker setting is for 6 ch, or the sound mode is OFF (6 ch mode), the speaker When the setting is for 5.1ch, since the acoustic characteristic of the acoustic signal output to the first output 120A by the DSP unit 15 does not correspond to the output characteristic of the setting speaker connected to the first output 120A, The output from the first output 120A will be muted.
[0024]
The audio device described in the claims is a vehicle-mounted audio device 10, the acoustic characteristic changing means is a DSP unit 15, the mode setting means and the speaker output characteristic setting means are the operation unit 16, and the mute control means is the DSP unit 15 (or the electronic volume 11A). ), The microcomputer 18, the characteristic determination means corresponds to the microcomputer 18, and the sound output terminal corresponds to the first output 120A.
[0025]
Next, the operation of the in-vehicle audio device 10 according to the present embodiment will be described. FIG. 4 is a flowchart showing a processing operation of the microcomputer 18 relating to the speaker output control processing of the vehicle-mounted audio device 10 according to the present embodiment.
[0026]
The speaker output control process illustrated in FIG. 4 does not correspond to the acoustic characteristics when it is determined that the speaker output characteristics according to the speaker settings do not correspond to the acoustic characteristics of the acoustic signal according to the acoustic characteristic mode ON / OFF setting. This is a process of muting the audio signal from the first output 120A connected to the speaker. The process of muting the audio signal includes a process of completely shutting off the audio signal from the output unit, a process of attenuating the audio signal from the output unit, and the like.
[0027]
In FIG. 4, the microcomputer 18 determines whether the sound mode is ON, that is, whether the Dolby Pro Logic II is ON (step S11). When it is determined that the acoustic mode is ON, the microcomputer 18 determines that the sound mode is the 5.1 channel mode, and determines whether the current speaker setting is for the 5.1 channel (CENTER / SW) (step S12). .
[0028]
When the microcomputer 18 determines that the current speaker setting is for the 5.1 channel, the microcomputer 18 determines that the current speaker setting normally corresponds to the 5.1 channel output, and cancels the mute of the first output 120A (step S1). S13), the speaker output state shown in FIG. 2D is established, and this processing operation ends. Therefore, in order to provide 5.1-channel stereo sound, the on-vehicle audio device 10 outputs a CENTER sound signal of the entire band at the first output 120A and a low-range SW sound signal at the second output 120B. Will be.
[0029]
If it is determined in step S12 that the current speaker setting is not for 5.1ch, the microcomputer 18 determines that the speaker setting is for 6ch, and outputs an audio signal in the current audio mode (5.1ch mode). It is determined that the acoustic characteristic does not correspond to the speaker output characteristic of the speaker setting, and the acoustic signal from the first output 120A connected to the speaker is muted (step S14), as shown in FIG. 2C. A speaker output state is set, and this processing operation ends. In the mute control of the first output 120A in step S14, the speaker setting is for 6ch and the first output 120A is connected to the SW-Lch speaker. -To prevent output of CENTER audio signals in the entire band in the 5.1ch mode to the Lch speaker.
[0030]
If it is determined in step S11 that the acoustic mode is not ON, the microcomputer 18 determines that the acoustic mode is OFF, that is, the 6ch mode, and the current speaker setting is for 6ch (SW-L / R). It is determined whether or not there is (step S15).
[0031]
When the microcomputer 18 determines that the current speaker setting is for 6ch, it determines that the current setting corresponds to 6ch output normally, and cancels the mute of the first output 120A (step S16). The speaker output state shown in FIG. 2A is reached, and this processing operation ends. Therefore, in the in-vehicle audio device 10, an audio signal for SW-Lch is output at the first output 120A and an audio signal for SW-Rch is output at the second output 120B so as to provide 6-channel stereo sound. .
[0032]
If the microcomputer 18 determines that the current speaker setting is not for 6ch, the microcomputer 18 determines that the current speaker setting is for 5.1ch, and the acoustic characteristic of the acoustic signal in the current acoustic mode (6ch mode) is changed. It is determined that the speaker output characteristic does not correspond to the speaker output characteristic of the speaker setting, and the sound signal from the first output 120A connected to the speaker is muted (step S17), whereby the speaker output state shown in FIG. , And this processing operation ends. In the mute control of the first output 120A in step S17, since the speaker setting is for 5.1ch and the first output 120A is connected to the CENTER speaker, the CENTER for the full band output is used. It is intended to prevent a low-range SW-Lch acoustic signal from being output to the speaker for 6ch mode.
[0033]
According to the present embodiment, the 6ch output and the 5.1ch output can be switched, and when the current speaker setting is different from the sound mode ON / OFF setting, for example, the speaker setting is performed while the sound mode is OFF (6ch mode). Is used for 5.1ch, or when the acoustic mode is ON (5.1ch mode) and the speaker setting is for 6ch, the acoustic characteristics of the acoustic signal in the acoustic mode are actually connected. It is determined that the output characteristics do not correspond to the speaker output characteristics, and the audio signal from the first output 120A connected to this speaker is muted. Therefore, the output characteristics of the speaker do not correspond to the audio signals. Unsatisfactory sound output can be reliably prevented, and a comfortable sound signal can be provided.
[0034]
In the above embodiment, different speakers are connected to the first output 120A in the speaker settings of the 6ch mode and the 5.1ch mode. Therefore, when the acoustic mode and the speaker setting are different, the first output 120A is used. The audio signal from the second output 120B is muted when the different speakers are connected to the second output 120B in the speaker settings of the 6ch mode and the 5.1ch mode. This is to control mute.
[0035]
Further, in the above-described embodiment, the in-vehicle audio device 10 capable of switching between the 6ch output and the 5.1ch output has been described as an example. However, the present invention is not limited to such a system. Needless to say, if the output characteristic of the speaker does not correspond to the acoustic characteristic of the acoustic signal, the acoustic signal from the output unit connected to the speaker is muted. .
[0036]
In the above embodiment, the electronic volume 11 has 6 channels, and the vehicle is provided with a total of 6 output channels of the front L / R 111A, 111B, the rear L / R 112A, 112B, the first output 120A, and the second output 120B. The audio device 10 has been described. From the viewpoint of enabling switching between 6ch output and 5.1ch output, as shown in FIG. 5, for example, front L / Rs 111A and 111B, rear L / Rs 112A and 112B, An electronic volume 11A having a total of seven output channels, one output 120A, a second output 120B, and a third output 120C, is arranged. The first output 120A is dedicated to CENTER, and the second output 120B and the third output 120C are SW. The exclusive use makes it unnecessary to switch speaker settings.
[0037]
【The invention's effect】
According to the acoustic device of the present invention configured as described above, when it is determined that the output characteristics of the connected speaker do not correspond to the acoustic characteristics of the acoustic signal changed by the acoustic characteristic changing means, the speaker The mute control of the output of the audio signal output to the audio output terminal connected to the speaker is performed, so even if the audio characteristics of the audio signal do not correspond to the output characteristics of the speaker to be actually connected, the audio characteristics and the speaker output An unsatisfactory sound output caused by a mismatch between the characteristics can be reliably prevented, and a comfortable sound signal can be provided.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration inside a vehicle-mounted audio device showing an embodiment of an audio device of the present invention.
FIG. 2 is an explanatory diagram simply showing a speaker output state based on a setting relationship between a speaker and an acoustic mode ON / OFF according to the present embodiment.
FIG. 3 is a table explanatory diagram briefly showing output contents of a first output and a second output based on a setting relationship of a speaker and an acoustic mode ON / OFF according to the present embodiment.
FIG. 4 is a flowchart illustrating a processing operation of a microcomputer related to a speaker output control processing according to the present embodiment.
FIG. 5 is a block diagram showing a schematic configuration inside a vehicle-mounted audio device showing another embodiment.
[Explanation of symbols]
10 Audio equipment (car audio equipment)
15 DSP unit (acoustic characteristic changing means, mute control means)
16 operation unit (mode setting means, speaker output characteristic setting means)
18 Microcomputer (characteristic determination means, mute control means)
120A 1st output (sound output terminal)

Claims (1)

A mode setting unit for setting an acoustic mode, and an acoustic characteristic changing unit for changing an acoustic characteristic of an acoustic signal based on the acoustic mode set by the mode setting unit and outputting the changed acoustic signal to an acoustic output terminal. An acoustic device having
Speaker output characteristic setting means for setting output characteristics of a speaker connected to the sound output terminal;
Characteristic determining means for determining whether or not the output characteristic of the speaker set by the speaker output characteristic setting means corresponds to the acoustic characteristic of the acoustic signal changed by the acoustic characteristic changing means;
When the characteristic determining means determines that the output characteristic of the speaker does not correspond to the acoustic characteristic of the acoustic signal changed by the acoustic characteristic changing means, the output of the acoustic signal output to the acoustic output terminal is muted. A sound device comprising: a mute control unit.

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