JP2005045615A - Speaker system and duct varying method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to adjust a bass resonant frequency and a frequency characteristic (f<SB>0</SB>) that is a reproduction limit of lower frequencies than the bass resonant frequency through enabling adjustment of a variable duct even if it becomes impossible to put in a hand or the like as a result of change in the set position of a speaker system. <P>SOLUTION: An automatically variable duct system 14 is installed in a speaker cabinet 12. The variable duct 34 is designed so as to automatically move to a predetermined position by means of a command from an operational unit 24 or a remote controller 25. Then, the moved duct length of the variable duct 34 is shown on a display 26. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a phase inversion type speaker device and a method for changing a duct of the speaker device, and more particularly, a speaker device and a duct of the speaker device in which a duct of a bass reflex cabinet (hereinafter referred to as a bass reflex) having a duct is automatically varied. It relates to a variable method.

  Conventionally, bass reflex type speaker devices are well known. Further, Patent Document 1 discloses a duct that can be manually changed in a duct used in such a bass reflex type speaker device. 6 (A) and 6 (B) are schematic cross-sectional views of the main part disclosed in Patent Document 1, and 1 indicates a speaker arranged in the first housing 2. 3 is a 2nd housing, These 1st and 2nd housings 2 and 3 are comprised by the substantially cylindrical shape. On the front surface of the second housing, there is a fixed duct 3a that emits sound from the speaker 1 to the outside.

  Reference numeral 4 denotes a variable duct, which is inserted into a fixed duct 3a provided in the second housing 3 and can be locked at a desired arbitrary position. As an example of the fixing method, as shown in FIG. 6B, a groove 3c into which a protrusion 4a formed at the tip of the movable duct 4 is fitted and inserted into the inner peripheral surface of the fixed duct 3a, and the fixed duct 3a. And a plurality of branch line grooves 3g provided at predetermined positions in the axial direction of the inner peripheral surface. With such a configuration, the movable duct 4 is inserted into the fixed duct 3a after the protrusion 4a of the variable duct 4 is aligned with the groove 3c of the fixed duct 3a, and then the protrusion 4a is predetermined by rotating it. The movable duct 4 is positioned on the fixed duct 3a by being fitted to any one of the branch line grooves 3g provided at the position.

  According to the above-described speaker device, the duct can be manually changed. However, in recent bass reflex type speaker devices, the mounting position of the duct is not limited to the baffle plate side of the speaker cabinet. There are things arranged on the side plate, top plate side and the like. When the user listens to the sound from such a speaker device, the installation location of the speaker device can be considered in various cases depending on the user. For example, when placing on the wall, putting in a bookshelf, or placing an object on the top board, the variable duct 4 could not be moved by hand after the speaker device was set at a predetermined position. .

Also, sufficient bass resonance frequency and reproduction below the bass resonance frequency at the preset variable position of the duct due to changes in the installation position and environment of the speaker device, for example, room redesign, wall perspective, curtains, etc. I could not obtain a frequency characteristic of the limit (hereinafter referred to as f _0).

Furthermore, it was not possible to vary the equalizer characteristic by adjusting the f ₀ position to suit the preferences of the music source type and track users.
JP 9-74595 (left column on page 4)

The present invention has been made to solve the above-mentioned problems. The problem to be solved by the present invention is that the variable duct can be automatically changed according to changes in the installation position and environment of the speaker device, and An object of the present invention is to obtain a speaker device capable of adjusting the f ₀ position according to the type of music source and the preference of the music piece and a duct variable method of the speaker device.

  In order to solve the above problems and achieve the object of the present invention, the first aspect of the present invention is characterized in that the duct length is automatically varied in accordance with the installation position of the speaker device.

  According to a second aspect of the present invention, there is provided a speaker device having a speaker and a variable duct in a speaker cabinet, wherein the automatic duct variable means for electrically moving the duct and the automatic duct variable means are controlled. Control means, display means for displaying at least the duct length, operation means for instructing the duct length to become a predetermined length, and the duct length is variable according to the installation position of the speaker device. And

  A duct variable method for a speaker device according to a third aspect of the present invention is a duct variable method for a speaker device having a speaker and a variable duct in a speaker cabinet, and an automatic duct variable process for making the duct electrically movable. A control process for controlling the duct automatic variable process, a display process for displaying at least the duct length, and an operation process for instructing the duct length to become a predetermined length, depending on the installation position of the speaker device The duct length is variable.

  According to the first speaker device of the present invention, the variable duct can be automatically changed according to the change of the installation position and environment of the speaker device, so that the variable duct can be set even after the speaker device is set to the predetermined position. Can be adjusted.

According to the second and third speaker apparatuses and the duct variable method of the speaker apparatus of the present invention, the variable duct can be automatically changed according to changes in the installation position and environment of the speaker apparatus. it is possible to obtain a duct variable method of the speaker device and the speaker apparatus capable of adjusting the f ₀ position according to the type and music preferences.

  Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a system diagram of one embodiment of the present invention, FIG. 2 is a rear view of a speaker device used in the present invention, FIG. 3 is a front view of a duct driving mechanism used in the present invention, and FIG. FIG. 5 is an explanatory view of a frequency characteristic curve of the present invention.

  In FIG. 1, reference numeral 10 denotes a circuit diagram of the speaker device as a whole. The speaker 11 is fixed to a baffle plate 13 in a speaker cabinet 12, and an acoustic signal is transmitted through a sound emission hole formed in the baffle plate 13. Sounds out. An automatic variable duct device 14 constituting a bass reflex is disposed in the speaker cabinet 12. The automatic variable duct device 14 will be described later with reference to FIGS. A predetermined acoustic signal is supplied to the speaker 11 from the input terminal 15 via a music source such as a CD player. These signals are supplied to the low frequency compensation circuit 17 through the fixed contact b and the movable contact a of the switch 16 for switching.

  The low frequency compensation circuit 17 is connected to a power amplifier 18, and the power amplifier 18 is connected to the speaker 11. Reference numeral 20 denotes a control circuit (hereinafter referred to as CPU) including an MPU, which is configured to exchange data with various circuits via the interfaces 19a and 19b. The interface 19a is connected to a fixed contact c of the switch 16 via a digital-analog conversion circuit (hereinafter referred to as ADC) 21 and supplies a test signal for automatic adjustment to the speaker 11 as will be described later. The interface 19a further controls the low frequency compensation circuit 17, the motor M for driving the automatic variable duct device 14, and the variable resistor VR of the rotary encoder 62. A microphone 22 is disposed in front of the speaker 12, and a test signal collected by the microphone 22 is supplied to an interface 19 a via an analog-digital conversion circuit (hereinafter referred to as ADC) 23.

  The CPU 20 includes a display unit such as an operation unit 24 that constitutes an input circuit via an interface 19b, an infrared sensor 30 that receives a command signal from a remote controller (hereinafter referred to as a remote controller) 25, and an LCD (liquid crystal display device) that constitutes an output circuit. 26. Further, the equalizer circuit 27, the work RAM and ROM of the CPU 20, and a non-volatile memory 29 having a table storing duct length data and low frequency correction parameter data are connected.

  Next, the automatic variable duct device 14 disposed in the speaker cabinet 12 will be described with reference to FIGS. In the speaker cabinet 12 of this example, as shown in FIG. 2, a variable duct 3 4 can slide in a duct hole 32 formed in the lower end portion of the back plate 31 opposite to the speaker 11 attached to the baffle plate 13. To insert. In FIG. 2, 33 is an input terminal for the speaker 11 fixed to the back plate 31.

  3 is a plan view with the rear plate removed showing the state in which the automatic variable duct device 14 is fixed to the baffle plate 13, FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3, and the automatic variable duct device 14 is shown in FIG. And the base board 35 formed in the substantially rectangular shape as shown in FIG. 4 is fixed to the lower position in the baffle plate 13 of the speaker cabinet 12 by a predetermined method. A disk-shaped substrate 37 is fixed on the base substrate 35. An outer diameter of a substantially cylindrical fixed duct 36 is inserted and erected in a through hole 38 formed in the center of a disk-shaped base 37 fixed on the base substrate 35 with screws or the like. The fixed duct 36 may be inserted and erected up to the inside of the through hole 39 formed in the base substrate 35 and the baffle plate 13. In this case, the sealing plate 40 may be inserted into the inner diameter of the fixed duct 36 or may be formed integrally with the fixed duct 36 with the sealing plate 40.

  The outer diameter of the fixed duct 36 is formed so that the front end is gradually narrowed toward the front end direction, and a spiral forming duct 42 is inserted into the outer diameter of the fixed duct 36 to form the outer diameter portion of the fixed duct 36. A convex portion 44 provided on the inner diameter of the lower portion of the spiral forming duct 42 is rotatably inserted into the groove portion 43. A spiral groove 45 is formed in the spiral forming duct 42, and the movable amount of the variable duct 34 is determined by the pitch of the spiral groove 45. The variable duct 34 is inserted into the outer diameter of the spiral forming duct 42, and the guide protrusion 46 formed on the inner diameter of the variable duct 34 is inserted into the spiral groove 45 of the spiral forming duct 42. In FIG. 4, it is made to move in the direction of arrow BB by rotating.

  In order to enable the above-described variable duct 34 to be automatically slidable by a motor or the like, a pulley 46 fitted to the shaft of the motor M and a shaft 48 standing on the base substrate 35 are rotatably fitted. The second spur gear 53 and the third spur gear, in which the belt 47 is stretched between the pulleys 49, the first spur gear 50 and the pulley 49 are integrally formed, and are rotatably fitted on the shaft 51. A fourth spur gear 55 and a fifth spur gear 56 which are meshed with a second spur gear 53 composed of 54 and a first spur gear 50 and are rotatably fitted on the shaft 52. The gear 55 and the third spur gear 54 are engaged with each other. A movable gear 57 made of a spur gear is fixed to the outer diameter portion of the spiral forming duct 42, and the movable gear 57 and the fifth spur gear 56 are engaged with each other.

  Further, two guide columns 58A and 58B are erected on the base substrate 35 as shown in FIG. 3, and the guide columns 58A are inserted into guide grooves 60 formed in a guide plate 59 made of a substantially rectangular plate fixed to the movable duct 32. , 58B are inserted.

  For example, if the motor M is driven by pressing a manual button or the like of the operation unit 24 with the above-described configuration, the rotational force of the motor M is pulley 46-belt 47-pulley 49-first spur gear 50-second. The driving force transmitted to the spiral forming duct 42 through the path of the spur gear 53 -the third spur gear 54 -the fourth spur gear 55 -the fifth spur gear 56 -the movable gear 57 is The guide protrusion 46 of the variable duct 34 inserted into the spiral groove 45 by rotating 42 is moved in the BB direction along the spiral groove 45, so that the protrusion length of the variable duct 34 from the duct hole 32 is increased. Can be adjusted. Further, the movable gear 57 meshes with a rotary encoder 62 having a spur gear fixed to the rotating shaft.

  One mode of operation in the above configuration will be described with reference to FIG. First, the speaker is placed in a predetermined position, such as a room, and the user reads predetermined duct length data or low-frequency correction parameter data from the non-volatile memory 29 and listens to music or the like. Assume a case where the variable duct length is changed when the position of the device is changed to a wall or the like. In this case, the user presses the auto or manual button in the operation unit 24 or the remote controller 25. In the case of auto operation, the CPU 20 supplies pink noise from a noise generator or the like in the CPU 20 to the DAC 21 via the I / F 19a according to the command data supplied to the CPU 20 via the I / F 19b. The test signal is converted into an analog signal, and the test signal emitted from the fixed contact c of the switch 16, the movable contact a, the low frequency correction circuit 17, the power amplifier 18, and the speaker 11 is picked up by the microphone 22. The output from the microphone 22 is converted into digital data by the DAC 23, supplied to the I / F 19 a, and input to the CPU 20.

  The CPU 20 performs comparison or calculation based on the test data vs. duct length data and test data vs. low-frequency correction parameter data stored in advance in the non-volatile memory 29. The motor M of the automatic variable duct device 14 is driven via the I / F 19a. The rotational force from the motor M moves the variable duct 34 in the BB direction via a transmission mechanism composed of a spur gear group. The CPU 20 determines the duct length and the low-frequency correction parameter based on the variable resistance value VR of the rotary encoder 62. The data is obtained and these values are displayed on the display unit 26, and the driving of the motor M is stopped to expand and contract to a duct position of a predetermined length.

  In the case of a manual operation, the duct length or / and the low frequency correction parameter data can be adjusted by the user's operation of the manual button. When changing the variable duct length, the user presses the manual button in the operation unit 24 or the remote controller 25. The control signal of the CPU 20 is a music source supplied to the input terminal 15 via the I / F 19a, and an acoustic signal is sent through the path of the fixed contact b-movable contact a-low range correction circuit 17-power amplifier 18-speaker 11 of the switch 16. Sound is emitted from the speaker 12. When the user presses the duct button to adjust the duct length to a desired length based on the emitted acoustic signal, the CPU 20 expands and contracts the variable duct 34 through the path of I / F 19b-CPU 20-I / F 19a-motor M. Let The low-frequency correction parameter can also be adjusted by pressing the manual operation button and the low-frequency correction button similar to the adjustment of the duct length. Of course, the duct length data and the low frequency correction parameter are displayed on the display unit 27.

Next, a method of obtaining the bass resonance frequency of the speaker device having the above-described configuration and the reproduction limit frequency characteristic (f ₀ ) below the bass resonance frequency will be described with reference to FIGS. Figure 5 (A) B) are those showing a frequency characteristic curve of f ₀ near for explaining the adjustment state of f _0, the horizontal axis indicates frequency and the vertical axis shows the level. First will be described with reference to FIG. 5 (A) for adjusting the _{f 0.} Figure 5 characteristic curve 65 shown in (A) If the f ₀ is shifted to the high frequency side, the characteristic curve 66 is the duct unadjusted characteristics when the frequency or lower frequency of f ₀ extends to the low frequency Although these are curves, the frequency characteristic curves up to f ₀ can be flattened by adjusting these characteristic curves, for example, as the characteristic curve 67.

Further, the characteristic curve 68 shown in FIG. 5 (B) is a duct when f ₀ is gradually lowered to the low frequency side, and the characteristic curve 69 is a duct when the level of the low frequency below the frequency of f ₀ is increased. the adjustment is before the characteristic curve of these characteristic curves for example, with extending the frequency characteristic curve of f ₀ by adjusting so as to synthesize the characteristic curve 68 and characteristic curve 69 as the characteristic curve 70 to f ₀ following Can be flat.

  Furthermore, according to the present invention, the equalizer characteristic of the equalizer circuit 27 can be automatically adjusted according to the types A, B, and C of the music source in the preset buttons of the operation unit 24. Equalizer characteristics can be set for each source. For example, a predetermined graphic equalizer characteristic corresponding to an acoustic signal can be obtained by selecting an adjustment value by an auto button and a preset button of a user's favorite preset value (for example, B).

It is a systematic diagram which shows one example of the speaker apparatus of this invention, and the duct variable method of a speaker apparatus. It is a rear view which shows one example of a speaker apparatus used for this invention. It is a front which shows one form example of the drive mechanism of the duct used for this invention. It is a sectional side view which shows one example of the drive mechanism of the duct used for this invention. It is explanatory drawing of the frequency characteristic curve of this invention. It is a sectional side view of the principal part of the conventional speaker apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Speaker apparatus 11 Speaker 14 Automatic variable duct apparatus 17 Low-frequency correction circuit 20 Control circuit (CPU)
22 Microphone 23 ADC
24 Operation unit 25 Remote control 27 Equalizer circuit 29 Non-volatile memory 32 Variable duct 36 Fixed duct

Claims (8)

In a speaker device having a speaker and a variable duct in a speaker cabinet, duct automatic variable means for making the duct electrically movable,
Control means for controlling the duct automatic variable means;
Display means for displaying at least the duct length;
And operating means for instructing the duct length to become a predetermined length,
A speaker device, wherein the duct length is varied in accordance with an installation position of the speaker device.   2. The speaker device according to claim 1, wherein a low frequency resonance frequency of the speaker device and a frequency characteristic of a reproduction limit equal to or lower than the low frequency resonance frequency are selected by the operation means. Supplying the output of the microphone that picks up the sound emission signal from the speaker to the control means;
The control means displays the duct length data or low-frequency correction parameter data recorded in a table of a non-volatile memory on the display means based on the output of the microphone. The speaker device according to claim 2.   The said operation means is equipped with the switching means which can adjust the said duct length according to the kind of music of the sound emission signal from the said speaker, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. Speaker device. In a method of changing a duct of a speaker device having a speaker and a variable duct in a speaker cabinet,
Duct automatic variable process that makes the duct electrically movable,
A control process for controlling the duct automatic variable process;
A display process for displaying at least the duct length;
An operation process for instructing the duct length to become a predetermined length;
A duct variable method for a speaker device, wherein the duct length is varied in accordance with an installation position of the speaker device.   6. The duct variable method for a speaker device according to claim 5, wherein the bass resonance frequency of the speaker device and a frequency characteristic of a reproduction limit equal to or lower than the bass resonance frequency are selected by the operation process.   The output of the microphone that picks up the sound emission signal from the speaker is supplied to the control means used in the control process, and the duct is recorded in the non-volatile memory table in the control process based on the output of the microphone. 7. The duct variable method for a speaker device according to claim 5, wherein long data or low-frequency correction parameter data is displayed in the display process.   The duct length is adjusted and varied in accordance with the type of music of the sound emission signal from the speaker in the switching process of the operation process. The duct variable method of the speaker apparatus of description.

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