JPH0213097A - Drive control device for loudspeaker system - Google Patents

Abstract

PURPOSE:To faciliate the fine division setting of a cross-over frequency and a signal delay time, etc., by storing plural kinds of parameter information necessary for variable-controlling a delay time into a storing part and driving plural loudspeakers with delaying signals for respective systems, respectively. CONSTITUTION:The parameter information necessary for the variable control of the delay time is memorized into a storing part 18 composed of a ROM, etc. To plural loudspeakers 15, for a listening point 22, in making a loudspeaker 15a located at a most distant point into a reference, by a sound wave propagation time corresponding to distance differences (x), (y) and (z) mutually among them, signals to drive loudspeakers 15b-d are delayed by delaying parts 12b-d. Then, the phases of sound waves generated by respective loudspeakers 15a-d to be received at the listening point are made even. At such a time, by setting many kinds of parameter information corresponding to the delay times to the storing part 18, the fine adjustment of a signal delay time can be executed. As a result, the wave front of an arriving sound wave to the listening point 22 can be correctly adjusted.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a speaker system in which multiple speakers are driven at the same time.
This invention relates to a drive control device that relatively slows down the temporal timing of fU.

[Prior Art] Conventionally, this type of device divides the frequency band of an audio signal into three parts: high, medium, and low. I L,, respectively high and
It is known that speakers for medium and low frequencies are equipped with a receiver for sound reproduction, and by adjusting the time delay of the electrical signals supplied to each speaker, the phases of the sound waves emitted from different types of speakers are aligned. was.

As means for delaying and varying the time of this audio signal, an inductor (L), a capacitor (C),
It has been usual to use combinational switching circuits such as resistors (R) or charge transfer devices (BAD).

Furthermore, it has been common practice to use an analog active filter as the frequency band dividing means, and to set or change the crossover frequency by switching a group of resistors.

[Problem to be solved by the invention] However, in order to make the settings of the signal delay time and crossover frequency variable, it is necessary to switch the values of the LCR circuit and the resistor (R), and it is necessary to switch the values of the LCR circuit and the resistor (R). Since the size of the structure is naturally limited, there is a drawback that it is difficult to set the delay time and the lossover frequency by finely dividing them with a technically simple mechanism.

In addition, when using a BBD element for time delay purposes, the delay time can be set finely, but due to the characteristics of the 8BD element itself, the signal-to-noise (S/N) ratio is, for example, 60 to 70 dB, and the frequency characteristics are For example, there was a problem in that insufficient performance could be obtained up to about 10 kilohertz.

Therefore, this invention was made to solve the above-mentioned conventional drawbacks and problems, and its purpose is to easily realize subdivision settings such as crossover frequency and signal delay time. @PurchaseThe object of the present invention is to provide a drive control device for a speaker system that can easily obtain sufficient performance.

[Means for Solving the Problems] The gist of the present invention to achieve the above-mentioned object is to provide a speaker system in which one audio digital signal path is branched into multiple systems, and a speaker is driven for each system. In the system,
A delay section that delays the digital signal is inserted into each of the branched digital signal paths, and a variable section that variably controls the delay time of the signal passing through this delay section is provided. A drive control device for a speaker system includes a control section for supplying parameter information, and a storage section storing a plurality of parameter information corresponding to a set delay time is connected to the control section.

In addition, a filter section that divides the frequency band is inserted into each of the digital signal paths branched into multiple systems, and a variable section that variably controls the crossover frequency of this filter section is provided, and this variable section variably controls the crossover frequency. A drive control device for a speaker system comprising a control unit that supplies parameter information of filter coefficients necessary for exists in

Furthermore, a filter section and a delay section are inserted and connected in series to each of the digital signal paths branched into multiple systems, and a variable section is provided to variably control the crossover frequency of the filter section and the delay time of the delay section. The variable section is provided with a control section that supplies parameter information necessary to variably control the crossover frequency and the delay time, and this control section stores parameter information corresponding to the set crossover frequency and the set delay time. The present invention relates to a drive control device for a speaker system which is connected to a storage section.

[Function] With this structure, by storing multiple types of parameter information necessary to variably control the delay time in the storage unit, the parameter information corresponding to the delay time set from the outside can be stored. The output signal is taken out and transmitted to the variable section via the ttil control section, and the delay section delays this current $ signal for each system.

Then, a plurality of speakers are respectively driven by delayed signals for each system.

As a result, the phase of the sound waves emitted from each speaker is
Correcting is performed so that the sound wave reach distances from each speaker are equal at different listening points. Alternatively, when speakers of different types are used, the sound source generation center positions of each speaker are corrected so that they appear to be aligned upwards.

Since the delay time is determined by digital signal processing, the sound quality characteristics are improved compared to the conventional example.

At this time, the delay time can be easily and finely variably set because it is sufficient to store the corresponding parameter information in the storage section.

Furthermore, the frequency band is divided into a plurality of systems, and the crossover frequency is finely and variably set in accordance with the speakers for each band.

Furthermore, the crossover frequency and delay time can be easily and easily variably controlled without increasing the size of the device.

[Example] Next, embodiments of the present invention will be described based on the drawings.

As shown in Figure 1, the input audio analog signal is
A digital (Δ/D) converter 10 converts the signal into a digital signal, and converts the digital signal path 11 into four signal paths 118 to 11d.
It branches into delay sections 12a to 12d, digital-to-analog (D-A) conversion sections 13a to 13d, and amplification 'a14a to 1.
4d and speakers 158 to 15d are respectively connected to system a-
d m is connected in parallel.

A variable section 16 that variably controls the delay time of the signal passing through the delay section 12 is provided. A control section 17 is provided that provides the variable section 16 with parameter information required for variable control of the delay time.

This parameter information is stored in a storage section 18 consisting of a ROM or the like, and the storage section 18 is connected to the control section 17.

The control unit 17 has variable signal delay time settings for each system.
Operation unit 1 consisting of volume and keys for operation
9 and a display unit 20 made of a liquid crystal or the like that displays set values and the like are connected.

The variable section 16 stores the latest parameter information received from the control section 17.
1 is connected.

When the listening point 22 is in the positional relationship shown in the first diagram with respect to a plurality of speakers 15, the farthest speaker 15a
, and the distance difference between them is X.

For the sound wave propagation time corresponding to y and Z, the speaker 15b~
d is delayed by delay sections 12b-d. The drive signal for the speaker 15a is not delayed by the delay section 12a.

Then, the phases of the sound waves emitted by each of the speakers 15a to 15d received at the listening point will be aligned.

At this time, fine adjustment of the signal delay time becomes possible by setting a large amount of parameter information corresponding to the delay time in the storage unit 18. As a result, the wavefronts of the sound waves reaching the listening point 22 are accurately matched.

Further, the frequency characteristics of the time delay can be easily extended to, for example, 20 kilohertz by digital signal processing.

At the same time, the S/N ratio is also improved to, for example, 80 to 90 decibels, and the sound quality characteristics are improved.

FIG. 2 shows another embodiment of the invention. Components similar to those in the first illustrated embodiment are designated by the same reference numerals, and description thereof will be omitted.

Filter sections 23a to 23d are inserted and connected to the digital signal paths 11a to 11d branched into four channels, respectively.
It constitutes a divider.

Parameter information of filter coefficients necessary for dividing the audible frequency band into four parts of high, high-middle, low-middle, and bass ranges by the filter parts 25a to 25d is transmitted from the control part 17 to the variable part 23, and the variable part 23 The latest parameter information taken by the receiver is stored in the memory section 24, and the crossover frequencies of the filter sections 25a to 25d are variably set and controlled.

The signals divided into four bands are delayed by the delay unit 12, and then emitted as sound waves from the high, high-middle, low-middle, and bass reproduction speakers 26a to 26d.

Although the acoustic radiation center positions of each speaker 26 are located one behind the other, the delay unit 12
By delaying the signal at , the sound waves emitted from the speakers 25a-d are in phase.

A plurality of types of parameter information corresponding to the crossover frequency of the filter section 25 are stored in the storage section 18.
By pulling out and using the signal corresponding to the setting value from the operating section 19, the crossover frequency can be variably adjusted in small steps.

FIG. 3 shows an example of the display section 20. This means that the crossover frequencies (X-FRQ) are 80 hertz, 800 hertz, and 8 kilohertz, and the slope characteristics (SLOPE) of the filter section 25 are 12 dB/off tarp and -6 dB voltage sum constant cross. , the phase (PHASE) of the drive signal is normal (N) and reverse (R), the signal delay time (TIME) of the low-mid sound speaker (LMID) 26c is 417 microseconds, and the high sound speaker (
HIGH) is also 688 microseconds, indicating that the total signal level (T-LEV) is minus 10 decibels.

[Effect of the Invention 1] As described above, according to the present invention, in a speaker system consisting of a plurality of speakers, the crossover frequency during frequency band division and the delay time of the signal that drives each speaker can be easily and easily refined. It is possible to make variable fine adjustments by dividing the settings, and it has the remarkable effect of improving the S/N ratio and frequency characteristics to improve the sound quality.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the invention, FIG. 2 is a block diagram showing another embodiment, and FIG. 3 is a front view showing the display contents of the display section. 11... Digital signal path, 12... Delay section, 15.
26...Speaker, 16.23...Variable part, 17.
...control section, 18...storage section, 19...operation section, 2
5...filter section. Figure 1 Figure 3

Claims (3)

[Claims] (1) Branch one audio digital signal path into multiple systems,
In a speaker system that drives speakers for each system, a delay section that delays the digital signal is inserted into each branched digital signal path, and the delay time of the signal passing through this delay section is variably controlled. A variable section is provided, a control section is provided for supplying parameter information necessary to variably control the delay time to the variable section, and the storage section stores a plurality of parameter information corresponding to the set delay time in the control section. A drive control device for a speaker system that connects. (2) Branching one audio digital signal path into multiple systems,
Insert a filter section that divides the frequency band for each system,
A variable section that variably controls the crossover frequency of this filter section is provided, a control section that supplies parameter information of filter coefficients necessary to variably control the crossover frequency is provided to this variable section, and this control section is provided with a control section that variably controls the crossover frequency of the filter section. A drive control device for a speaker system that is connected to a storage unit that stores parameter information corresponding to overfrequency. (3) One digital signal path is branched into multiple systems, a filter section and a delay section are inserted and connected in series for each system, and the crossover frequency of this filter section and the delay time of the delay section are variably controlled. A variable section is provided for controlling the crossover frequency and the delay time, and a control section is provided for supplying parameter information necessary for variable control of the crossover frequency and the delay time to the variable section. A speaker that is connected to a storage unit that stores parameter information.
Drive control device for the system.