JPH07271356A - Recording method for manipulated amount of pedal - Google Patents

Abstract

PURPOSE:To provide the pedal manipulated amount recording method which can reproduce pedal operation while securing acoustic precision and also maintain compatibility with conventional musical performance information. CONSTITUTION:When the pedal operation is within a certain stroke TH+alpha, the pedal position Ps corresponding to the pedal operation is recorded as 1st pedal information and when the pedal operation is done exceeding the certain stroke TH+alpha, a lifter position which shifts corresponding to the pedal operation is recorded as 2nd pedal information. In case of variation from the 1st pedal information to the 2nd pedal information, on the other hand or variation from the 2nd pedal information to the 1st pedal information, 3rd pedal information is generated by smoothing those 1st pedal information and 2nd pedal information through an interpolating circuit 9, and then recorded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pedal operation amount recording method suitable for use in, for example, an automatically playing piano.

[0002]

2. Description of the Related Art Conventionally, an automatic performance piano is known which automatically performs performance in accordance with recorded performance information (or performance information supplied from the outside). The automatic playing piano is provided with a pedal mechanism for attenuating the string striking sound, and the pedal mechanism is driven in accordance with the pedal information reproduced. The purpose of recording the pedal information is to reproduce the attenuation rate change of the string striking sound accompanying the pedal operation.
Therefore, the ideal condition is to give the damping rate directly, but this is not realistic, so the position of the damper that actually abuts the string and is used to mute the sound is recorded as pedal information. Is desired.

Originally, it was explained that the damper position D _S most reflects the attenuation rate of the string striking sound, but the damper is not moved only by the vertical movement of the pedal, but is displaced by the keystroke operation. It is not possible to separate different actions. Therefore, since it is desired that the displacement of only the vertical movement of the pedal is controlled and the displacement of the portion as close to the damper as possible is controlled, as a result, the lifter position L _S described above is recorded as the pedal information. .

Now, the pedal mechanism of the automatic performance piano 10 will be described with reference to the functional block diagram shown in FIG. In the figure, DW represents the transfer characteristic of the damper wire, and PS represents the hysteresis characteristic existing in the pedal shaft. As shown in this figure, considering the damper position D _S as a reference, first, the damper position D _S becomes the lifter position L _S via the damper wire DW. What is a lifter?
It is a member that displaces the damper in the vertical direction according to pedal operation. The lifter position L _S is given the hysteresis characteristic of the pedal shaft PS and becomes the pedal position P _S ,
This is recorded on the recording medium as pedal information.

That is, in the conventional automatic playing piano, since the actuator for pedal operation is mounted on the pedal shaft, the above-mentioned path is traced and the pedal position P _S is recorded as pedal information. is doing. Then, during reproduction, the damper position D _S is controlled by following the opposite path. That is, the pedal position P _S read out from the recording medium becomes the lifter position L _{S with} the hysteresis characteristic of the pedal shaft PS being given,
This becomes the damper position D _S via the damper wire DW.

[0006]

In the conventional recording / reproducing process of the pedal operation amount, the hysteresis characteristic of the pedal shaft PS exists in both the recording process and the reproducing process. Therefore, the lifter position L _S when the pedal information is recorded does not match the lifter position L _S when the pedal information is reproduced according to the pedal information, and the deviation between the two causes an error in the damper position D _S. . As a result, there is an adverse effect that the string striking sound at the time of recording is different from the string striking sound at the time of reproduction.

Moreover, if the piano that records the pedal information (operation amount) and the piano that reproduces the recorded pedal information are different, the above-mentioned two hysteresis elements are greatly different, so that the accuracy of the pedal information is further secured. There is also a problem that it becomes extremely difficult to do. In addition, since the pedal information itself is not normalized and the pedal operation amount is used as it is, this also causes a difficulty in ensuring accuracy.

Further, the problem remains when the lifter position L _S is recorded. That is, when the musical sound produced by the automatic playing piano is acoustically captured, it is necessary and sufficient to record the lifter position L _S as pedal information, but there is a so-called “play” portion existing in the movable range of the pedal. The operation amount cannot be recorded as pedal information. These points, for example, when using an automatic piano for education,
This makes it difficult to reproduce the movement of the pedal itself, making it difficult to learn how to operate the pedal. In addition, if performance information in which the lifter position L _S is recorded as pedal information is used in a conventional automatic performance piano, the compatibility with the conventional automatic performance data is lost, and the meaning of the pedal information, that is, attenuation The definition of the ratio and the start point of the lifter drive need to be the same as before. Therefore, an object of the present invention is to provide a pedal operation amount recording method capable of reproducing pedal operation while maintaining acoustic accuracy and maintaining compatibility with conventional performance information.

[0009]

In order to achieve the above object, in the invention according to claim 1, when the pedal operation is within a certain stroke, the pedal position corresponding to the pedal operation is set to the first position. First recorded as pedal information
From the first pedal information, and a second recording step of recording the lifter position which is displaced according to the pedal operation as second pedal information when the pedal operation exceeding the predetermined stroke is performed. When changing to the second pedal information, or when changing from the second pedal information to the first pedal information, the third pedal information obtained by smoothing the first and second pedal information is obtained. And a third recording step of generating and recording. Further, according to the invention described in claim 2, the first and second pedal information is normalized as a ratio to the total stroke amount of the pedal operation.

[0010]

According to the present invention, when the pedal operation is within a certain stroke, the pedal position corresponding to the pedal operation is recorded as the first pedal information, and when the pedal operation exceeding the certain stroke is performed, the pedal operation is performed. The lifter position that is displaced according to the operation is recorded as the second pedal information. On the other hand, when the first pedal information is changed to the second pedal information, or when the second pedal information is changed to the first pedal information, the first and second pedal information is smoothed. Generate and record the pedal information of No. 3. As a result, the pedal operation can be reproduced while ensuring the acoustic accuracy, and the compatibility with the conventional performance information can be maintained.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are diagrams showing the configuration of a pedal mechanism model to which an embodiment of the present invention is applied. The pedal mechanism shown in these figures is assumed to be a virtual model having no non-linear elements such as bending and hysteresis of structural members.
First, in FIG. 1, reference numeral 1 is a pedal operated by a performance operation or a drive actuator. Reference numeral 2 is a push-up rod that is movable up and down according to pedal operation. In FIG. 2, the push-up bar 2 is arranged to face the lifter 3 with a predetermined gap TH in between. Here, the predetermined gap TH
Corresponds to the “play” of the pedal 1. The lifter 3 displaces the damper 4 up and down according to the movement of the push-up bar 2 to damp the vibration of the string S.

In the pedal mechanism model described above, the pedal information is normalized by the ratio of the offset from the rest position to the entire movable range (full stroke) of the push-up rod 2. That is, as shown in FIG. 3, when the push-up rod 2 is pushed up to the full stroke (normalized physical position "1"), the pedal information corresponding to this is "1".
Incidentally, while the pedal information is "0" to "TH" becomes pedal position P _S, the "TH" or to "1" becomes the lifter position L _S. Then, the pedal position P _S and the lifter position L _S detected in such a pedal mechanism are recorded on the medium via the pedal operation amount recording device shown in FIG. The pedal position P _S and the lifter position L _S in the pedal mechanism are detected by the position detection sensor as in the conventional case.

Next, with reference to FIG. 4, the structure of the main part of this embodiment will be described. In the figure, T1 and T2 are input terminals to which a lifter position signal SL corresponding to the lifter position L _S and a pedal position signal SP corresponding to the pedal position P _S are input, respectively. These signals SL and SP are supplied from a lifter position detection sensor and a pedal position detection sensor (not shown). Reference numeral 5 is a comparator, and the signal SL is input to its non-inverting input terminal, while the signal TH + α is input to its inverting input terminal. The signal TH + α is a signal corresponding to the displacement amount obtained by adding the margin value α in consideration of mechanical variations to the above-described predetermined gap TH. The comparator 5 compares the signal TH + α with the signal SL, generates an “H (high)” level output signal when TH + α <SL, and otherwise outputs an “L (low)” level output signal. To occur.

Reference numerals 6 and 7 denote gate circuits that open and close the gate according to the output of the comparator 5. Gate circuit 6
Outputs the signal SL to the next stage when it receives the “H” level output signal from the comparator 5. On the other hand, when the gate circuit 7 receives the output signal of "L" level from the comparator 5, it outputs the signal SP to the next stage. Reference numeral 8 denotes an adder formed by an operational amplifier, which adds the signals supplied to the feedback resistor R ₃ and outputs the result. Reference numeral 9 is an interpolator for smoothing the output of the adder 8. This interpolator 9 includes an operational amplifier 1
0, the resistors R _{4 to} R ₆ and the capacitors C ₁ and C ₂ form a second-order Bessel filter, and smoothed pedal information is output from the output terminal T _OUT thereof. Various low-pass filters can be used as the interpolator 9. Among them, the Bessel filter does not cause transmission distortion because the group delay characteristic is constant, and is suitable for data recording.

However, according to the above configuration, when the lifter is actually driven, that is, when the lifter is displaced beyond the displacement amount TH + α corresponding to "play", the lifter position L _S is used as pedal information. As a result, accuracy in the acoustic sense can be secured. On the other hand, only the pedal in the range of "play" is when they are displaced, the recorded pedal position P _S as pedal information. As a result, the pedal operation can be reproduced at the time of reproduction. The switch point from the lifter position L _S to the pedal position P _S, or it pedal information is discontinuous at the switching point from the pedal position P _S to the lifter position L _S, smoothed by interpolator 9 described above it By doing so, both are continuously switched. An example of such an operation is shown in FIG.

In FIG. 5, A represents the output of the adder 8 and B represents the lifter position L _S. C is the interpolator 9
, And D represents the pedal position P _S.
As can be seen from the example shown in this figure, the lifter position L _S (line A) is a pedal information between times t ₀ ~t _1, also, between the time t ₁ ~t _2, switching by the interpolator 9 via a section (line C), switches to the pedal position P _S, the pedal position P _S (line D) is a pedal information. further,
The time t ₂ later, via a switching section (line C) by the interpolator 9 switches to the lifter position L _S, the lifter position L _S (line B) is the pedal information.

As described above, according to the above-mentioned embodiment,
When the displacement is greater than the displacement amount TH + α corresponding to “play”, the lifter position L _S is used as pedal information, while
When the only pedal in the range of "play" is displacement, to record the pedal position P _S as pedal information. Further, at the switching point from the lifter position L _S to the pedal position P _S , pedal information obtained by smoothing the both is recorded. By doing so, it is possible to reproduce the pedal operation while maintaining the acoustic accuracy and maintain compatibility with the conventional performance information. In addition, it becomes possible to correspond to an automatically-playing piano using either a well-known pedal drive type or lifter drive type.

[0018]

According to the present invention, when the pedal operation is within a certain stroke, the pedal position corresponding to the pedal operation is recorded as the first pedal information, and when the pedal operation exceeding the certain stroke is performed, The lifter position that is displaced according to the pedal operation is recorded as the second pedal information. On the other hand, when the first pedal information is changed to the second pedal information, or when the second pedal information is changed to the first pedal information, the first and second pedal information is smoothed. Since the pedal information of No. 3 is generated and recorded, it is possible to reproduce the pedal operation while ensuring the acoustic accuracy and maintain compatibility with the conventional performance information.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a pedal mechanism model to which an embodiment of the present invention is applied.

FIG. 2 is a diagram showing a configuration of a pedal mechanism model to which an embodiment of the present invention is applied.

FIG. 3 is a diagram for explaining pedal information in the embodiment.

FIG. 4 is a circuit diagram showing a main configuration of a pedal operation amount recording device to which the embodiment is applied.

FIG. 5 is a diagram for explaining an operation example of the pedal operation amount recording device.

FIG. 6 is a diagram for explaining a conventional example.

[Explanation of symbols]

1 ... Pedal, 2 ... Push-up rod, 3 ... Lifter, 4 ... Damper, 9 ... Interpolator, P _S ... Pedal position, L _S ... Lifter position

Claims (2)

[Claims] 1. When a pedal operation is within a certain stroke, a first recording step of recording a pedal position corresponding to the pedal operation as first pedal information, and when a pedal operation exceeding the certain stroke is performed. , The second lifter position that is displaced according to the pedal operation is
A second recording step of recording the pedal information as the first pedal information, and changing from the first pedal information to the second pedal information, or the second pedal information from the first pedal information.
And a third recording step of generating and recording third pedal information obtained by smoothing the first and second pedal information when the pedal operation amount changes. Recording method. 2. The pedal operation amount recording method according to claim 1, wherein the first and second pedal information is normalized as a ratio to the total stroke amount of pedal operation.