JPH0713037Y2 - Electronic piano sound source circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electronic piano tone generator circuit.

[Conventional technology]

Conventionally, it has been ideal for this type of device to reproduce all the sounds of a live piano by replacing it with digital data, but since it requires a huge number of memory elements to actually realize it, it is generally a pseudo It was realized by cutting out and joining only the corrugated part that is characteristic liquid.

[Problems to be solved by the device]

In the case of conventional musical instruments, especially when playing a piano waveform, it was not possible to incorporate all of its characteristics, and it was easy to have a bad effect on the sound at the seam portion when it was partially stored in memory in a separated state. Also, in terms of circuitry, the splicing circuit was likely to be complicated.

An object of the present invention is to provide an electronic piano tone generator circuit which reproduces the characteristics of musical instruments, particularly piano waveforms, and has a simple circuit configuration.

[Means for Solving the Problems]

A D / A converter circuit for converting a memory element storing the entire time of one note of a piano of a musical instrument as a reference sound at maximum level as digital data and a data read from the memory element into an analog signal, and the D / A. By providing the variable frequency generation circuit that outputs the sampling frequency of the converter circuit at the frequency designated by the key insertion, the piano sound of the designated scale is reproduced.

[Action]

When the reference sound is 44.1 KHz sampling data,
To raise the semitone, first 46.7 for the variable frequency generator.
After setting to output 2395 KHz, the data is sequentially read from the storage element 1 and sent to the D / A converter circuit to reproduce a half tone higher sound. At this time, if the pitch of the piano sound is raised, it becomes shorter than the length of the recorded reference sound, and if the pitch is lowered, it becomes longer than the length of the reference sound. There is a characteristic that the duration becomes shorter as the length becomes longer and higher, so there is basically no need to manipulate the time.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment in which a keyboard is used for the control of the present invention. In the case where the piano sound is digitally stored in the memory element 1 of the sound source, when a key on the keyboard 14 is pressed, a signal is sent from the start signal line 6 to the memory element 1 and the waveform data Is read.

The data read from the storage element 1 is input to the waveform processing circuit 4 via the data bus 7. Waveform processing circuit 4
Then, the data required for the piano sound such as the strength and the length of the keyboard 14 pressed is received via the keyboard information line 8 and the waveform characteristics are left as they are, and processing relating to level changes such as envelope and attack is performed. When processing a chord on a piano, the D / A converter circuit 2 and the variable frequency setting circuit 3 corresponding to the number of chords are added, and the data processed by the waveform processing circuit 4 is processed by the digital output signal line 10 into a plurality of D / A signals. Input to A converter circuit 2. As for the sampling frequency of each D / A converter circuit 2, after the chord information of the keyboard 14 is calculated by the chord information line 9 from the chord information processing circuit 5 and the set value is calculated, it is sent from the frequency data line 13 to the variable frequency generation circuit 3. Sampling frequency line with preset frequency
Sent from 12.

An analog output signal line in which the digital data input to the D / A converter circuit 2 is converted into an analog signal.
The sound is sent from 11 to the speaker 15 to reproduce the sound.

[Effect of device]

According to the present invention, a complicated circuit such as a pseudo-waveform generating circuit which is used in the conventional device is eliminated, and the circuit is simplified, and at the same time, the storage element has a small capacity for one sound, and the cost and space are reduced. It is advantageous. Further, since the time of one sound as a whole is stored in a high-quality digital sound source, the sound quality is improved, and at the same time, there is an effect that the troubles that occur when the waveforms are inherited are completely eliminated.

[Brief description of drawings]

 FIG. 1 is a block diagram showing an embodiment of the present invention. 1 ... Storage element 2 ... D / A converter circuit 3 ... Variable frequency designation circuit 4 ... Waveform processing circuit 5 ... Chord information processing circuit 6 ... Start signal line 7 ... Data bus 8 ... Keyboard information line 9 ... chord information line 10 ... digital output signal line 11 ... analog output signal line 12 ... sampling frequency line 13 ... frequency data line 14 ... keyboard.

Claims (1)

[Scope of utility model registration request] 1. A storage element for storing, as digital data, an attack to a decay of one note of a musical instrument serving as a reference tone in a tone generator circuit of an electronic piano for generating music, and data read from the storage element as an analog signal. A D / A converter circuit for conversion and a variable frequency generation circuit for outputting the sampling frequency of the D / A converter circuit at a specified frequency, and outputting a plurality of scales with a storage element for one sound The tone generator circuit of the electronic piano.