US 5,629,490 AGranted

Piano

AssigneeKabushiki Kaisha Kawai Gakki Seisakusho

InventorTatsuya Inaba

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Abstract

In a piano which is enabled to provide performance using electronic sound source as well as normal piano play, the proposed piano is such a piano where there is no difference of balance between the normal piano play and the play using electronic sound source. When key is moved in an electronic sound source mode, CPU detects a number n of the key (S110), detects a time lag .DELTA. T between the timings at which blockage is caused between light emitting elements and light receiving elements of both key sensors (S120), and calculates a velocity V according to the time lag .DELTA. T (S130). Then, performance data is prepared according to these key depression information, at the performance data preparation routine (S140), and a delay time Td corresponding to the velocity V is determined by using a delay time determination table (S150). Subsequently, it is determined whether the delay time Td has elapsed (S160). When it has elapsed, the performance data is outputted to the electronic sound source (S170). As a result, sound is created, with the delay time Td, according to the key depression intensity as an interval after the key depression.

Claims8

Dependent claims

A composite acoustic/electronic piano having hammers, strings, a keyboard having a plurality of keys, a string striking mechanism operably connecting each of the hammers to a corresponding one of said keys to cause the hammers to strike the strings and generate string striking sound in response to operation of the keys, an electronic sound source, and a control means operably connected to said keys and said electronic sound source to control the electronic sound source to generate electronic sound in response to operation of the keys, wherein said control means comprises:

a mode selection means for selecting either one of a) an acoustic mode in which the string striking mechanism causes the hammers to strike the strings and generate string striking sound, and b) an electronic mode in which the control means controls the electronic sound source to generate electronic sound;
interception means for intercepting action of the hammers when the electronic mode is selected, to prevent the hammers from striking the strings and generating string striking sound;
the control means being operably connected to the keys via detection means for detecting depression and release of each of said keys and transmitting corresponding information to said control means, whereby the control means controls the electronic sound source according to the information sent from said detection means;
and
delay time determination means for determining a delay time by which sound emission at the electronic sound source is delayed after detection of key depression by the detection means;
wherein the delay time determination means includes a delay time determination table associated with each key, each delay time determination table containing predetermined delay times for the associated key that correspond to a delay time between key depression and string striking sound of the associated key in the acoustic mode, such that delay time variations between the keys, caused by variant hammer weights and different sting striking mechanisms, are incorporated into the predetermined delay times.

3 more elements

A composite acoustic/electronic piano having hammers, strings, a keyboard with a plurality of keys, a string striking mechanism operably connecting each key to a corresponding hammer such that key depression causes the corresponding hammer to strike a string and generate a string striking sound, an electronic sound source, and control means operably connected to the keys and electronic sound source for controlling the electronic sound source such that key depression generates electronic sound, the control means comprising:

mode selection means for selecting one of:
i) an acoustic mode in which the string striking mechanism causes the hammers to strike the strings and generate string striking sound, and
ii) an electronic mode in which the control means controls the electronic sound source to generate electronic sound;
interception means for intercepting hammer action when the electronic mode is selected, to prevent the hammers from striking the strings and generating string striking sound;
detection means for detecting depression and release of the keys and transmitting corresponding information to said control means, the detection means operably connecting the keys to the control means, whereby the control means controls the electronic sound source according to the information transmitted from the detection means;
delay time determination means for determining a delay time by which sound emission from the electronic sound source is delayed after detection of key depression by the detection means, the delay time determination means including a delay time determination table with predetermined delay times for the keys;
the predetermined delay times corresponding to actual delay times between key depression and string striking sound in the acoustic mode;
and
update means for updating the delay time determination table to compensate for variations of actual delay times in the acoustic mode over time and between pianos by:
i) determining the actual delay time between detection of key depression and detection of a resulting string striking sound in the acoustic mode;
and
ii) dividing the actual delay time by the predetermined delay time for the depressed key contained in the delay time determination table to obtain a correction coefficient for updating the predetermined delay time for the depressed key contained in the delay time determination table.

9 more elements

mode selection means for selecting one of:
i) an acoustic mode in which the string striking mechanism causes the hammers to strike the strings and generate string striking sound, and
ii) an electronic mode in which the control means controls the electronic sound source to generate electronic sound;
interception means for intercepting hammer action when the electronic mode is selected, to prevent the hammers from striking the strings and generating string striking sound;
detection means for detecting depression and release of the keys, detecting key depression intensity of the keys and transmitting corresponding information to said control means, the detection means operably connecting the keys to the control means, whereby the control means controls the electronic sound source according to the information transmitted from the detection means;
delay time determination means for determining a delay time by which sound emission from the electronic sound source is delayed after detection of key depression by the detection means, the delay time determination means including a delay time determination table with predetermined delay times for the keys;
the predetermined delay times corresponding to actual delay times between key depression and string striking sound of the keys in the acoustic mode and varying according to key depression intensity;
and
update means for updating the delay time determination table to compensate for variations of delay time in the acoustic mode over time and between pianos by:
i) determining the actual delay time between detection of key depression and detection of a resulting string striking sound in the acoustic mode;
and
ii) dividing the actual delay time by the predetermined delay time for the depressed key and the detected key depression intensity contained in the delay time determination table to obtain a correction coefficient for updating the predetermined delay time for the depressed key and the detected key depression intensity contained in the delay time determination table.

9 more elements

Dependencies are inferred from the claim text.