Claims
- 1. An electronic musical instrument comprising:
- differential value quantizing means for sequentially quantizing differential values each between adjacent sampled values of a received sampled value signal, and for sequentially adding quantizing errors each produced when a differential value is quantized to corresponding first differential values to be next quantized sequentially;
- lower significant bit separating means for sequentially separating respective groups of lower significant n bits of the first differential values quantized by said differential value quantizing means when the respective first differential values are quantized with n being a natural number equal to or larger than 2 to obtain corresponding second differential values, and for sequentially adding respective groups of separated n bits to corresponding first differential values to be next processed sequentially;
- adaptive quantizing means for causing each of the obtained second differential values to be subjected to adaptive quantization to obtain an adaptive quantized value, and for adding a quantizing error produced in the adaptive quantization by decoding the adaptive quantized value to the corresponding second differential value to be next subjected to adaptive quantization;
- storage means for storing the adaptive quantized value obtained by said adaptive quantizing means;
- a performance operator for designating a pitch of a tone to be generated; and
- tone signal generating means for sequentially reading out adaptive quantized values stored in said storage means on the basis of a frequency corresponding to the pitch designated by said performance operator, for decoding the second differential values from the read-out adaptive quantized values, for sequentially accumulating the decoded second differential values by 2.sup.n times at a period corresponding to 1/2.sup.n of the sampling period of the received signal, and for outputting the resulting signal to generate a tone signal.
- 2. An electronic musical instrument comprising:
- storage means for storing an adaptive quantized value obtained by the steps including a differential value quantizing step of sequentially quantizing differential values each between adjacent sampled values of a received sampled value signal, and sequentially adding quantizing errors each produced when a differential value is quantized to corresponding first differential values to be next quantized sequentially; a lower significant bit separating step of sequentially separating groups of lower significant n bits of the first differential values quantized by said differential value quantizing step when the respective first differential values are quantized with n being a natural number equal to or larger than 2 to obtain corresponding second differential values, and sequentially adding the respective groups of separated n bits to corresponding first differential values to be processed next; an adaptive quantizing step of causing each of the obtained second differential values to be subjected to adaptive quantization to obtain an adaptive quantized value, and adding a quantizing error produced in the adaptive quantization by decoding the adaptive quantized value to the corresponding second differential value to be next subjected to adaptive quantization;
- a performance operator for designating a pitch of a tone to be generated; and
- tone signal generating means for sequentially reading out adaptive quantized values stored in said storage means on the basis of a frequency corresponding to the pitch designated by said performance operator, for decoding the second differential values from the read-out adaptive quantized values, for sequentially accumulating the decoded second differential values by 2.sup.n times at a period corresponding to 1/2.sup.n of the sampling period of the received signal, and for outputting the resulting signal to generate a tone signal.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3-199601 |
Aug 1991 |
JPX |
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Parent Case Info
This is a division of application Ser. No. 07/920,268, filed Jul. 27, 1992, now U.S. Pat. No. 5,323,154.
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Divisions (1)
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Number |
Date |
Country |
Parent |
920268 |
Jul 1992 |
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