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Sound system

A sound source and processing device technology, applied to electro-acoustic musical instruments, static memory, instruments, etc., can solve the problems of high clock SCK frequency and power consumption, and achieve the effect of suppressing power consumption waste

Inactive Publication Date: 2007-06-20
OKI ELECTRIC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Therefore, if the number of sounds to be synthesized increases, the frequency of the system clock SCK required for the waveform synthesis process will increase, and the CPU 30 and the like will operate with a clock signal of a higher frequency than the necessary frequency, resulting in increased power consumption. question
In addition, there is also the problem of increased power consumption due to operation at a clock frequency higher than the necessary frequency during performances with many notes and few sounds.

Method used

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Embodiment 1

[0026] FIG. 1 is a configuration diagram showing a sound source system according to Embodiment 1 of the present invention, and the same elements as those in FIG. 2 are assigned the same reference numerals.

[0027] Since the sound source system inputs musical piece data such as MIDI data and outputs PCM data such as desired instrument sounds, the sound source system has a MIDI memory 10 that stores MIDI data supplied from a not-shown host CPU. The MIDI memory 10 is connected to the CPU 30 via the internal bus 20 . Internal bus 20 is made up of following parts: Output CPU 30 is used for specifying the address line 21 of the memory of access object or the address ADR of peripheral circuit; A control line 23 for the control signal CON for the operation; and a clock line 24 for supplying the system clock SCK as a reference for the operation.

[0028] A ROM 40 storing programs and data for processing, a RAM 50 temporarily storing data being processed, a timer 60 for performance ti...

Embodiment 2

[0044] FIG. 3 is a configuration diagram showing a sound source system according to Embodiment 2 of the present invention, and the same elements as those in FIG. 1 are assigned the same reference numerals.

[0045] The sound source system is provided with a clock generation unit 81 that generates a system clock SCK of a preset frequency instead of the clock generation unit 84 in FIG. 86 generates a clock signal of a frequency corresponding to the setting value of the frequency setting register 83, and outputs a clock ACK for waveform synthesis.

[0046] In addition, instead of the sound source accelerator 70 , a sound source accelerator 70A to which a sound number setting register 74 is added is provided. The number of notes setting register 74 is a control register capable of setting the number of notes to be played from the CPU 30 via the internal bus 20 , and the set value of the number of notes setting register 74 is supplied to the waveform synthesizer 72A. Other structu...

Embodiment 3

[0054] FIG. 4 is a configuration diagram showing a sound source system according to Embodiment 3 of the present invention, and the same elements as those in FIG. 3 are assigned the same reference numerals.

[0055] This sound source system is provided with a clock generating part 84, to replace the clock generating part 81 among Fig. Instead of the frequency setting register 83, a frequency setting register 83A capable of holding set values ​​for the two clock generating sections 84 and 86 respectively is provided.

[0056] In addition, this sound source system has a power control register 11 for setting a limit value of power consumption from the host CPU. The power control register 11 is connected to the internal bus 20 and can refer to the set value from the CPU 30 . Other structures are the same as those shown in Figure 3.

[0057] In this sound source system, according to the number of polyphonic performances and the type of input MIDI data during music performance, acc...

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Abstract

The invention provides a sound system capable of reducing the consumed power in the sound system. The sound system is provided with, separately, a clock generation section (84) that generates a system clock (SCK) for supply to a CPU (30) or others via an internal bus (20), and a clock generation section (85) that generates a waveform synthesis clock (ACK) for supply to a waveform synthesizer (72) of a sound accelerator (70). The clock generation section (84) is so configured as to output a frequency corresponding to a value set by the CPU (30) to a frequency setting register (83). Note here that the frequency of the clock generation section (85) may be set variable by the CPU (30). This enables operation with a further-optimum clock frequency so that the increase of power consumption caused by unnecessarily high-speed clock signals can be prevented in the sound system.

Description

technical field [0001] The present invention relates to a sound source system used in portable devices and the like, and particularly relates to a technique for realizing low power consumption of the sound source system used in portable devices and the like. Background technique [0002] Fig. 2 is a structural diagram of a conventional sound source system. [0003] The sound source system, for example, inputs music data such as MIDI (Musical Instrument Digital Interface, Musical Instrument Digital Interface) data, outputs PCM (PulseCode Modulation, Pulse Code Modulation) data such as desired musical instrument sounds, and has a host computer that is not shown in the figure. MIDI memory 10 for MIDI data output by CPU (Central Processing Unit, central processing unit). The MIDI memory 10 is connected to the CPU 30 via the internal bus 20 . Internal bus 20 is made up of following parts: Output CPU 30 is used for specifying the address line 21 of the memory of access object or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10H7/00G10H7/02G10H1/00G11C7/00G11C7/16
CPCG10H7/002G10H2230/041
Inventor 永末诚
Owner OKI ELECTRIC IND CO LTD