Sound source

A sound source and music performance technology, which is applied in the direction of telephone communication, instruments, electrical components, etc., can solve the problems of limited performance of sound pressure, inability to obtain playback volume, and inappropriateness, so as to prevent incongruity, improve hearing characteristics, The effect of improving playback efficiency

Inactive Publication Date: 2005-03-09
ROHM CO LTD
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Problems solved by technology

Therefore, the frequency band with good efficiency in its frequency characteristics is limited, and it is not suitable for playing music that requires a wide frequency band. In addition, since it operates at a low voltage of about 3V, the sound pressure is also low.
[0004] As described above, in portable devices such as mobile phones, due to structural constraints, only efficient sound emitting parts with limited frequency bands can be used, and sufficient sound emission volume cannot be obtained. In addition, the performance of sound pressure also restricted

Method used

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Embodiment Construction

[0051] A. Device structure:

[0052] FIG. 1 is a block diagram showing the structure of a sound source device 100 according to an embodiment of the present invention.

[0053] As shown in FIG. 1 , the sound source device 100 is provided with a plurality of waveform generating units 80. The waveform generating unit 80 is composed of a waveform table TB, which is stored in advance in accordance with the frequency band with high efficiency of the sound emitting unit 90. The generated waveform table storage device, such as random access memory or read-only memory (ROM) constitutes; the waveform readout section RB reads out the waveform data of the waveform table TB at arbitrary intervals; and the multiplication block JB, in order to obtain In the playback sound improved in terms of harshness, the value of the read waveform data is changed momentarily, coefficients for generating decaying waveforms or coefficients for volume adjustment are stored, and these coefficients are multipl...

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Abstract

The present invention relates to a sound source device, and it aims at providing a sound source device, in which a sufficient sound emitting quantity can be attained, capable of obtaining a reproduced sound of musically rich expression. And, in order to attain the aforementioned object, it is possible to solve such a problem that energy density is low and sound emitting efficiency is inferior by employing a pseudo-rectangular wave increasing spectral density as waveform data input in a waveform table (TB). For this, it is rendered a spectrum including spectral lines X1, X2, X3 and X4 in a range matching with a frequency domain (HR) having high sound emitting efficiency and including even harmonics.

Description

technical field [0001] The present invention relates to improvement of a portable device having a sound emitting unit whose frequency band is limited, and a sound source device thereof. Background technique [0002] Usually, the sound source device included in the electronic musical instrument converts the sound recorded and edited from the artificial sound generated by rectangular wave, sawtooth wave, sine wave, or natural sound, musical instrument sound, etc. into digital quantity by using AD converter or the like. , Waveform synthesis is performed using a pre-set wave table, but a speaker with a good sound frequency band is connected to the playback system at this time. [0003] On the other hand, sound emitting units such as speakers provided in portable devices such as mobile phones are designed to be small and lightweight in order to fully realize the portability that is a characteristic of portable devices. Therefore, the frequency band with good efficiency in its fr...

Claims

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Application Information

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IPC IPC(8): G10H5/10G10H7/00G10H7/02G10H7/08G10H7/10H04M1/00
CPCG10H7/00G10H7/02G10H2250/235G10H5/10G10H7/10
Inventor 栗原茂树
Owner ROHM CO LTD
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