Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Masahiko Hatanaka

Daisuke Mori

Masahiro Nakanishi

Katsuyoshi Fujii

Hiroshi Saito

Kiyotaka Nagai

Minoru Toyoda

Hideo Shibuya

Hisayoshi Zenke

Hiroko Shinada

Shusuke Miyaji

Mizuho Seki

Tomoaki Abe

An image data compressing apparatus includes an image data compressor for compressing image data input thereto at first and second compression rates to produce first and second compressed data, respectively, an approximate-expression selector having an approximate-expression table including approximate expressions corresponding to sample data sizes, respectively, and a compression rate determining unit for determining the second compression rate. The approximate-expression selector selects an approximate expression from the approximate expressions. The first approximate expression corresponds to a first sample data size nearest a data size of the first compressed data among the sample data sizes. Each of the approximate expressions indicates a change of a data size in response to a compression rate. The compression rate determining unit determines the second compression rate based on the selected approximate expression. The image data compressing apparatus provides a desired size of the compressed image data by maximum two of the compressing operations.

Apparatus and method for compressing image data

A musical sound synthesizing apparatus which simulates a sound generating mechanism of a string instrument by using an electronic circuit comprises a driver for applying data, an adder, a delay unit for storing data temporarily, a low pass filter for processing data, and a word length designating unit for designating a word length (address width) of the delay unit. The adder, delay unit and low pass filter form a loop-shaped circuit, with their corresponding input ends and output ends connected with each other. The word length designating unit corrects a word length of the delay unit in accordance with a phase delay of the low pass filter or in accordance with the number of stages of the pipeline structure of the loop. In the case where a musical sound of the type generated by touching or hitting strings is synthesized, the driver reads at least two series of data stored beforehand and applies the read data to one of the inputs to the adder. While, in the case where a musical sound of the type generated by rubbing strings is synthesized, the driver applies, to one of the inputs to the adder, data calculated on the basis of at least two data read out from mutually different addresses in the delay unit and data (corresponding to the velocity of a bow) inputted thereto externally.

Musical sound synthesizing apparatus

The purpose of the present invention is to offer an electronic musical instrument which can synthesize the sound of brass instruments with fidelity and furthermore in real time. In order to achieve the above purpose, the musical sound synthesis algorithm is to utilize the tonguing information as well as the embouchure information in addition to the sound generation information, the frequency information, and the sound volume information, which have been used as the playing informations in conventional electronic musical instruments. Furthermore, by tabulating the functional relations between the above-mentioned playing informations and corresponding output waveforms, and storing them in memories, necessary waveforms for sounding the musical instrument can be obtained by only referring to those tables, thereby the speed-up, that is, the realization by hardware, can be realized and thus the sound of brass instruments can be synthesized with fidelity and in real time.

Electronic musical instrument with improved generation of wind

In a musical tone waveform producing apparatus having an operating device for receiving an instruction from a user, a waveform memory, a waveform control circuit for reading out tone-color waveform data from the waveform memory, an envelope memory, an envelope control circuit for reading out the envelope data from the envelope memory, and a multiplier for producing a resultant waveform, tone-color waveform data formed of a number of waveform data blocks each having an attenuation flag is prestored in the waveform memory and the attenuation flag is received by the envelope control circuit to produce attenuated envelope data while the attenuation flag is valid and to output the envelope data read out of the envelope memory while the attenuation flag is invalid. As a result, the resultant waveform has no undesirable noise component caused by the following tone-color waveform data.

Musical tone waveform producing apparatus for electronic musical

In a speech analysis and synthesis (composing) method, a phoneme transition waveform is generated to smoothly couple phoneme PHA to PHB having different pitch periods. The method involves obtaining the differential value (difference phoneme .DELTA.PH or difference phoneme .DELTA.PHI and difference clock or pitch period), and in composition merely adding phoneme PHA and difference phoneme .DELTA.PHI and clock period and difference clock period.

Voice analysis composing method

Growing community of inventors

Osaka, Japan

Masahiko Hatanaka