JPH01300698A - Sound field variable device - Google Patents

Abstract

PURPOSE:To vary the sound field continuously in real time by storing a processing procedure required to apply continuous sound field control into a processing command means in advance and having only to send a code for selecting the processing procedure from a system control means. CONSTITUTION:The device consists of an input means 1, a 1st signal processing means 2, a 1st processing command means 3, a 2nd signal processing means 4, a 2nd processing command means 5, a signal switching means 6, a system control means 7 and a signal output means 8. Then the two signal processing means 2, 4 and the two processing command means 3, 5 are in use and the processing procedure to apply continuous sound field control is stored in advance in the processing command means 2, 5 and a code for the processing procedure selection has only to be sent from the system control means 7 at sound field data switching. Thus, the quick change in the sound field is smoothed and such processing as sound field movement, sense of distance, sense of spread and movement of sound image are realized continuously in real time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sound field variable device that freely changes a reproduced sound field.

2. Description of the Related Art In recent years, the development of sound field reproducing devices has become important, and sound field variable devices that can simulate the sound field of a hall or the like have been developed.

FIG. 4 is a hardware block diagram showing the configuration of a conventional sound field reproduction device. In FIG. 4, 1 is a signal input means for inputting a digital signal; 9 is a signal processing means for processing the input signal so that it has target sound field characteristics; 1;
0 is a processing instruction means for instructing a processing procedure for signal processing by the signal processing means; 7 is a system control means for changing the instruction content of the processing instruction means and controlling the signal switching means; 8 is for outputting a digital signal. It is a signal output means.

The operation of the conventional sound field variable device configured as described above will be explained. In FIG. 4, the digital signal input from the signal input means 1 is subjected to signal processing in the signal processing means 9 according to the processing procedure of the processing instruction means 10. Next, the output from the signal processing means 2 is outputted from the signal output means 8, converted into an analog signal by an external digital-to-analog converter, and reproduced with the intended sound field characteristics by connecting it to an amplifier, speaker, etc. You can. If it is desired to change the sound field to be reproduced, the reproduction sound field can be changed by transmitting the processing means from the system control means 7 to the processing instruction means and then performing the same processing as described above.

Problems that the invention sought to solve However, with the above configuration, if it is attempted to continuously change the sound field data, the entire processing procedure must be transferred from the system control means to the processing instruction means. However, the problem was that the sound field could not be switched at quick intervals because the transfer took time.

The present invention has been made in view of the above problems, and is a sound field that smoothly changes the sound field quickly and realizes the movement of the sound field, the sense of distance, the sense of spaciousness, the movement of the sound image, etc. continuously in real time. This provides a variable device.

Means for Solving the Problems In order to achieve this object, the sound field variable device of the present invention includes first and second processing means that store processing procedures necessary for realizing continuous sound field changes. , a system control means that transfers a processing procedure selection code when switching sound fields, first and second signal processing means that perform signal processing according to the processing procedure, and signal switching that smoothly switches outputs from the plurality of signal processing means. It consists of means.

Effect: With this configuration, continuous or many machining procedures can be stored in advance in the first and second machining instruction means,
When switching the playback sound field, the system control means sends a code for selecting a processing procedure to realize the playback sound field to one of the processing instruction means, and the signal processing means performs signal processing according to the selected processing procedure, resulting in stable output. Then, by using the signal switching means to gradually reduce the amplitude of the first and second signal processing means and add the increased amplitudes while switching the output, the output can be changed continuously in real time without any noise during switching. You can change the playback sound field.

Embodiment Hereinafter, a sound field variable device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a hardware block diagram of a sound field variable device in one embodiment of the present invention. In FIG. 1, 1 is a signal input means for inputting a digital signal, 2 is a first signal processing means for processing the signal by delaying and feeding back the input digital signal according to a predetermined procedure, and 4 is a first signal processing means. 3 is a first processing instruction means for instructing the signal processing means on a signal processing procedure;
5 is a second processing instruction means; 6 is a signal switching means for switching the output signals of the first signal processing means 2 and the second signal processing means 4; and 7 is a signal switching means for switching between the first and second processing instruction means 3.5. A system control means controls the signal switching means 6 at the same time as transmitting a code for selecting a processing procedure, and a signal output means 8 outputs a digital signal.

The operation of the sound field variable device configured as described above will be described below. In Figure 1, in normal operation,
The signal from the signal input means 1 is processed by the signal processing means 2 according to the processing procedure selected by the first processing instruction means 3, and the signal is processed by the signal switch 7 to the first signal processing means 2.
The selected signal is output from the signal output means 8. At this time, the processing instruction means 5 of the second signal processing means 4 has selected the same processing procedure as the processing instruction means 3 of the signal processing means 2. Among the signals output from the first signal processing means 2 and the second signal processing means 4, the signal from the first signal processing means 2 is selected by the signal switching means 7 and output from the signal output means 8.

Next, the time of switching sound field data will be explained.

In the case of continuously changing the position of the listening point, a continuous processing procedure that not only changes the volume of the sound but also includes delay time and feedback information is required.

FIG. 2 shows a memory map of the processing instruction means.

Further, FIG. 3 shows a diagram showing the listening position of a certain hall. As shown in FIG. 2, processing procedures for realizing listening characteristics corresponding to listening positions 1 to 56 in FIG. 3 are stored for each area on the memory. When switching the sound field data, the system control means 7 transmits to the second processing instruction means 5 a code for selecting an address in which a processing procedure for realizing a sound field at the moved listening position is stored. For example, if you move from A to B in Figure 3, you can move from number 4 to 11, 18, etc. on the memory map in Figure 2.
Select the processing procedure in order from No. 25. First, processing procedure No. 11 is selected, and when the output from the second signal processing means 4 becomes stable, a switching signal is output from the system control means 7 to the signal switching means 6. The signal switching means 6 gradually decreases the signal from the first signal processing means 2, gradually increases the signal from the second signal processing means 4, and outputs the sum of both signals. After a certain period of time, the output from the signal switching means 6 is switched to the signal from the second signal processing means 4.

Next, select machining procedure No. 18 of the first machining instruction means 3 from the system control means 8 again, repeat the above operations alternately, and finally change machining procedure No. 25 to the second machining instruction. It is sufficient to set it to means 5.

In this embodiment, the speed at which the machining procedure of the first machining instruction means and the machining procedure of the second machining instruction means 5 are switched can be arbitrarily changed.

As described above, according to this embodiment, a plurality of signal processing means and a plurality of processing instruction means are used, and the processing instruction means stores the processing procedures necessary for performing continuous sound field control in advance, thereby controlling the system. By only sending the processing procedure selection code from the means 7, the sound field can be changed in real time and continuously without generating noise during data switching.

Furthermore, in this embodiment, continuous changes in the listening position have been described, but if the processing instructions for changes such as movement of a sound image and change in sense of distance are stored in the processing instruction means, continuous changes in the listening position can be made in real time. It is possible to change the field.

Effects of the Invention As described above, the present invention uses two signal processing means and two processing instruction means, and stores a processing procedure for continuous sound field control in the processing instruction means in advance. By simply sending a code for processing procedure selection from the system control means when switching data, it is possible to reproduce continuously changing sound fields or rapidly changing sound fields in real time while generating noise. It can be done without.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of hardware in an embodiment of the present invention, FIG. 2 is an explanatory diagram showing a memory map of the processing instruction means of the present invention, FIG. 3 is an explanatory diagram showing the listening position of the hall, and FIG. The figure is a block diagram of the hardware of a conventional sound field variable device. ■...Input means, 2...First signal processing means, 3...First processing instruction means, 4...
... second signal processing means, 5 ... second processing instruction means, 6 ... signal switching means, 7 ...
...System control means, 8...Signal output means.

Claims (2)

[Claims] (1) A signal input means for inputting an audio signal converted into a digital signal, a plurality of signal processing means for processing the signal by delaying and feeding back the input digital signal according to a determined procedure, and the signal processing means processing instruction means for instructing a signal processing procedure for a signal; signal switching means for smoothly switching a plurality of output signals from the plurality of signal processing means when switching processing procedures; A sound field variable device comprising: a system control means for controlling the signal switching means; and a signal output means for outputting a digital signal output from the signal switching means. (2) Preliminarily storing a large number of processing procedures for sound field control in the processing instruction means, and switching the processing procedure used for signal processing by sending only a code for selecting the processing instruction means from the system control means. A claim characterized by (
1) The sound field variable device described above.