JPH0766269B2 - Audio equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio device.

Configuration of Conventional Example and its Problems Many proposals have been made for a reverberation adding device. Basically, as shown in FIG. 1, the output of the amplifier 1 is fed back to the input of the amplifier 1 through the delay circuit 2 having a predetermined delay time at an appropriate level to obtain the echo time pattern of FIG. is there. A plurality of these circuits are combined to perform processing such as varying the synthesis level. In each case, the varying amount is changed according to the user's preference. However, the user has no way of knowing which state is closest to the recording state and the acoustic state at the time of recording. Also, the more delay circuits, the finer the time control, and the more reverberant the reverberation will be when recording.However, the number of user control items will increase and the control of each level of each delay time will become complicated. The reality is that I don't feel like using it.

OBJECT OF THE INVENTION An object of the present invention is to solve the above problems and to provide an audio device capable of easily obtaining reverberation close to a recording state.

Configuration of the Invention The audio apparatus of the present invention is an audio reproducing system for reproducing an audio source such as a recording tape or a recording disk.
Setting means for setting each time interval and each reflected sound level of each reflected sound of the echo time pattern composed of the nth to nth order, and each reflection of the echo time pattern of the audio reproduction signal according to the setting of the setting means. A control means for controlling each time interval of the sound and the level of each reflected sound is provided, and the control means captures and stores the device for measuring the echo time pattern and the delay time frequency characteristic of the listening room or the recording hall and the measurement data. The control means has a storage device, and by inputting the information in which the drawing of the audition room is represented by coordinates and the information of the sound source point and the listening point in the audition room by coordinates by the setting means, the control means causes direct sound and n-th order. The sound path length of each reflected sound is calculated, and the result is displayed and stored.

According to the configuration of the present invention, since the control means can control the time intervals and the levels of the reflected sounds of the echo time pattern of the audio reproduction signal to match the echo time pattern of the recording hall, When reproducing the audio source, it is possible to reproduce the sound spread and the sound field effect in a state close to an actual recording hole.

Further, by inputting the information in which the drawing of the listening room is represented by coordinates and the information of the sound source point and the listening point in the listening room by coordinate points by the setting means, the control means controls the direct sound and each reflected sound of the nth order. With the configuration in which each sound path length is calculated and the result is displayed and stored, the setting means automatically starts the calculation only by inputting the limited information of the listening room, which facilitates the input operation.

In particular, the control means can be easily realized by using a personal computer (hereinafter, referred to as a personal computer) which is becoming popular in general households and the like having a calculation function and a sequence function, and new reverberant sound and reflected sound can be created.

Description of Embodiments One embodiment of the present invention is shown in FIGS. First, FIG. 3 is a cross-sectional view of the large hall 3 and shows the paths of the direct sound 10, the primary reflection 14 and the secondary reflection 15 of the sound wave from the sound source 5 placed on the stage 4. The reverberation pattern at the listening point 6 is as shown in FIG. Further, in the reproduction audition room 7, it becomes as shown in FIG. The sound from the speaker 8 is propagated to the listening point 9 as a direct sound 10, a primary reflection 11 and a secondary reflection 12. FIG. 5 (b) shows the reverberation pattern in this listening room.

FIG. 6 shows an embodiment of the configuration according to the present invention, in which the signal from the audio input 26 is converted into a digital signal by an A / D (analog-digital) converter 27, and sequentially by a shift register group 28 (FIG. 8). Each delayed output is delayed and reverberation sound is obtained by the reverberation pattern generation circuit 30. A microcomputer (hereinafter referred to as a microcomputer) 31 controls the reverberation pattern generation circuit 30 under the control of the personal computer 39. The interface 38 transfers the control output signal of the personal computer 39 to the microcomputer 31 and the data from the microcomputer 24 to the personal computer 39. The reverberation pattern generation circuit 30 outputs the output of the shift register group 28 to the D / A as shown in FIG.
The (digital-analog) converter 48 converts the analog amount, and after the gain adjusting circuit 49 reaches a predetermined level, the multiplexer 50 adds and subtracts a predetermined delay output by the adder 51. The output of each gain adjustment circuit 49 is the feedback circuit 32.
A predetermined delay output is added by and is fed back to the input 26 and delay-combined again, and the power amplifier 18 drives the speaker 19 (8) via the switch S ₁ .

When measuring the reverberation characteristics of the reproduction listening room 7, the switch S ₁ is tilted to the A side, an impulse signal is applied from the input 17, and the sound from the speaker 19 is collected together with the reflected sound by the microphone 20 at the listening point 9, Amplify with amplifier 22 and comparator
23, adder 25, microcomputer 24 software and D / A conversion, reverberation level and time
It is transferred to and stored in the personal computer 39 via. Clock signal
29 sets the unit time of the shift register.
On the other hand, the keyboard 35 is connected to the input of the personal computer 39, which is controlled by the user's command and when the user inputs the figure of the hall by coordinates, the personal computer 39 calculates the reverberation pattern as shown in FIG. 5 (a). And remember. Similarly, data can be input from the tape recorder 33, the floppy disk 34, etc., and can be immediately input to the personal computer 39 by preparing a disk in which reverberation time characteristics in a well-known hall are recorded. Also, the control program of the personal computer 39 can be built by the user, and the software produced at the beginning can be purchased and input from the floppy disk, like other personal computers. From the data obtained as described above, the personal computer 39 operates according to the control program, and an example thereof is as follows.

First, the reverberation characteristic obtained by setting the switch S ₁ to the A side and inputting an impulse is stored in the personal computer 39 according to time and level as shown in FIG. 5 (b). On the other hand, the reverberation characteristic of a well-known large hall from a floppy disk is input to the personal computer 39 in the form of FIG. 5 (a) and compared with the reverberation characteristic of FIG. 5 (a), and the difference is small. The multiplexer is driven so that reverberation sound is created. That is, in order to obtain the hall reverberation characteristic between the sound source and the microphone at the time of recording, each time output of the delay circuit such as the shift register is selected, and each level is divided based on FIG. 5 (a). (Or subtraction) and add each delay time output to create reverberant sound. On the other hand, the reverberation characteristic (Fig. 5 (b)) in the playback listening room 7 is not found in the reverberation characteristic of the recording / playback hall in Fig. 5 (a) in the data obtained by actually measuring or inputting the figure of the listening room and the sound source or the listening point by coordinates. In order to reduce reverberation, the phase of the delay circuit output corresponding to each delay time is reversed, and the levels are matched and added (or even if subtraction is performed without changing the phase) Unnecessary reverberation in the listening room Is erased as shown in Fig. 5 (c), the reverberation sound created in Fig. 5 (b) is added, and a pure reverberation sound at the time of recording as shown in Fig. 5 (d) is reproduced. You can listen at the listening point in room 7.

As shown in FIG. 7, the shift register group 28 has flip-flops 44 connected to the respective bit signals of the digital signal, and sequentially transferred by the clock signal 43, and the flip-flops are sequentially transferred.
The delay signal for each clock time from 44 is the so-called MSB to LSB.
It consists of up to digital signals. In FIG. 7, reference numerals 40 to 42 are digital signals, 45 is a first-order delay output, 46 is a second-order delay output, and 47 is an n-th order delay output. However, with regard to this delay, it is possible to use a so-called RAM instead of the shift register, or to configure it as an analog signal with a BBD element or a CCD element.In any case, each delay output is selected by the digital control signal of the personal computer 39. The same result can be obtained by taking out and controlling each level according to the calculation result of the personal computer 39. Further, when each delayed signal of FIG. 7 is fed back to the input as shown in FIG. 8, a longer delay time can be obtained with a smaller delay element. In this case, the feedback level and feedback time (which delay time to which delay time is fed back) are controlled by the multiplexer according to the calculation result of the personal computer.
It can be realized by changing the connection of the feedback loop at 50.

In addition, the sound path table calculated by the personal computer 39 is displayed on the two-dimensional display device such as the cathode ray tube display 37 and the XY recorder 36, and the actual reflection state in the hall is displayed to the user, which is useful for clarifying and improving the sound quality. be able to. As this display, the sound path is displayed as a three-dimensional figure like the two-dimensional cross-sectional view and the broken line in FIG. 9 as shown in FIGS. 3 and 4, and also as shown in FIG. 5 (a) to (d). As described above, the level and time of each reflected sound can be graphically displayed by the echo time pattern.

In the above description, the frequency characteristics related to each delay were explained as being flat, but in an actual room, the reverberation time varies depending on the frequency due to the sound absorption coefficient frequency characteristics of the materials such as the inner wall, floor, and ceiling. It has (reflectance) and is not uniform over all frequencies. Therefore, in the case of strictly correcting not only the delay time but also its frequency level characteristic, a frequency characteristic compensation circuit is provided at the output of each delay circuit, and frequency correction is performed based on the sound absorption coefficient information such as the wall or ceiling input by the user. Or switch S ₁ to A
If you want to measure the reverberation frequency characteristics of the listening room, turn the output signal of the microphone into time-division, and set the F.
When the data is recorded by frequency analysis such as FT, the reverberation characteristic including the frequency characteristic can be controlled, and the difference between the characteristics of the recording room and the reproduction room can be almost corrected.

Also, when there are multiple sound sources 5 and 8 for recording and playback, similarly analyzing the data for each sound source and controlling each playback system by using multiple delayed playback systems is an application example. Of course.

By constructing the system surrounded by the broken line in FIG. 6 in this way, the reverberation sound can be freely controlled based on the program of the personal computer 39, and there is a large difference between the reverberation time during recording and during reproduction. In some cases, reverberation can be corrected. In addition, if the frequency characteristics are also controlled, the reverberation frequency characteristics of the playback listening room can be corrected, and there is no need for construction such as changing the wall material of the listening room as in the past, so the utility value is extremely high. . The personal computer 39 may be a dedicated computer such as an audio computer that also controls other audio devices. In any case, it has a calculation control function for driving peripheral devices according to a reverberation pattern meter and program. If it is good. Further, FIG. 10 is a flowchart showing the following functions.

EFFECTS OF THE INVENTION The audio device of the present invention has conventionally involved a great deal of labor for organizing and analyzing information because of complicated information, and changing the reverberation characteristics of the listening room involves difficulties such as changing the wall material in the room. The reverberation that is close to the recorded state can be easily obtained by solving the problem described above, and the user can create any desired reverberation while referring to quantitative information such as figures and reverberation time. It is possible to provide a number of advantages such that the source can be made to sound in an arbitrary well-known hall just by key operation.

Further, the control means inputs the direct sound and n by inputting the information indicating the drawing of the listening room by the setting means and the information indicating the sound source point and the listening point of the listening room by the coordinate points.
With the configuration in which each path length of each reflected sound is calculated and the result is displayed and stored, the setting means automatically starts the calculation only by inputting the limited information of the listening room. There is also an effect that the operation becomes easy.

[Brief description of drawings]

FIG. 1 is a conventional analog delay circuit diagram, FIG. 2 is its reverberation pattern diagram, FIG. 3 is a schematic sectional view of a recording hall to which an embodiment of the present invention is applied, and FIG. 4 is a listening room (playback room). ) Is a schematic cross-sectional view, FIG. 5 is a reverberation pattern diagram, FIG. 6 is a system block diagram of an embodiment of the present invention, FIG. 7 is a digital delay circuit diagram constituting a shift register, and FIG. 8 is a reverberation pattern generation block. Figures and 9 are perspective views of the recording hall,
Figure 10 is a flow chart of the system program for a personal computer. 3 ... recording hall, 4 ... stage, 5 ... sound source, 7 ...
… Playback audition room, 8 …… Speaker, 6,9 …… Listening point, 10…
… Direct sound, 11,12,13,14,15,16 …… Reflected sound, 17 …… Pulse input, 18,22 …… Amplifier, 20 …… Microphone, 23…
… Comparator, 25,51 …… Adder, 24,31 …… Microcomputer, 26 …… Audio input, 27 …… Analog-digital converter, 29 …… Clock signal, 28 …… Shift register group,
32 ... Feedback circuit, 33 ... Magnetic tape, 34 ... Floppy disk, 35 ... Keyboard, 36 ... XY recorder, 37 ...
… CRT display, 38 …… Common interface, 39 …… PC (personal computer)

Claims (6)

[Claims] 1. An audio device capable of reproducing a reverberation characteristic close to a recording state in a recording hole or the like when reproducing an audio source such as a recording tape or a recording disk. A reverberation pattern generation circuit that sets each time interval of each reflected sound of the echo time pattern and the level of each reflected sound, and a measuring means that measures the reverberation characteristics such as the level and time of the reverberant sound in the playback listening room. Input means for inputting information in which the figure of the recording hall is expressed in coordinates and information in which the sound source point and the listening point are expressed in coordinates, and a direct sound and each reflected sound of order n according to the input signal from the input means. And a control unit having a storage unit for storing the reverberation characteristic of the result of calculating each sound path length and storing the measurement result of the reverberation characteristic of the reproduction listening room, The control means controls the audio input signal in the reverberation pattern generation circuit based on the reverberation characteristic of the measurement result of the reproduction listening room or the reverberation characteristic of the input result of the recording hall stored in the control means, and controls the control result. An audio device characterized by being configured to output from an audio device body. 2. The storage unit of the control means has a storage / reproduction device such as a disk or tape in which acoustic information such as reverberation time and echo time pattern of a recording hole and coordinate information of the three-dimensional structure of the hole are stored. The audio device according to claim 1, wherein 3. The control means compares the reverberation characteristic including the echo time pattern between the sound source point and the listening point in the recording hall with the reverberation characteristic between the sound source point and the listening point in the reproduction listening room,
In order to control the reverberation pattern generation circuit so as to reduce the difference, there is a function of calculating addition and subtraction of reverberation sounds and time difference in each frequency or all audible bands. The audio device according to item 1. 4. The audio device according to claim 1, wherein the input means has a device for inputting an arbitrary echo time pattern or reverberation time characteristic by a numerical key. 5. The audio device body and the control means have software corresponding to a plurality of sound sources at the time of recording and reproducing, and claim 1.
The audio device according to item 2 or 3. 6. The control means displays various kinds of information or calculation results two-dimensionally or three-dimensionally or in time series on a display device such as a cathode ray tube or a printer. The audio device according to the second, third, fourth, or fifth paragraph.