Abstract: A variable bit rate audio information transmitting apparatus, and a method therefor, are disclosed in which a bit rate is properly increased or decreased in accordance with the amount of audio information and by taking a fixed bit transmitting rate as a reference, so that the data rate can be adjusted in accordance with the importance of the audio information. The data bit amount of the currently inputted frames are computed to compare with a fixed bit allocation amount, and surplus bits and dummy data are properly allocated to the compared result, so that the bit amount allocated to the inputted data amount can be varied in transmitting the signals. The bit distribution is efficiently carried out through bit amount variation adjustment in accordance with the amount of sound source. Therefore the sound quality is improved, the deterioration of the sound quality is reduced, and the audio data is reduced.

Abstract: A modulo reduction method using a precomputed table to increase a reduction speed during the execution of ordinary operational processes using computers and comprises a first step which searches out with an index of an upper log.sub.2 t (t.gtoreq.1) bit number and adds the value stored in a table to a lower n(n.gtoreq.512) bit number; a second step, which if the result, obtained from the addition of said lower n bit number to the number searched out from the table at said first step, produces an overflow (1 bit), eliminates said overflow and finishes the execution of an operation; and a third step, which if said overlow does not occur at said second step, adds .sub.N on a modulo N to the result obtained from said first step and finishes the execution of the operation.

Abstract: There is disclosed a biodegradable copolyester having a combination structure consisting of one or more repeating unit of alkyleneterephthalate and one or more repeating unit of hydroxyalkanoate, represented by the following general formula I: ##STR1## wherein n is an integer not more than 10, R is --CH.sub.3 or --C.sub.2 H.sub.5,X is, ##STR2## and a, b and c are independently a natural number, along with a preparation method therefor.An aromatic polyester have repeating unit of alkyleneterephthalate is reacted with an aliphatic polyester having repeating unit of hydroxyalkanoate at 100.degree. C. or more in a proper solvent, such as nitrobenzene and dimethylsulfoxide, in the presence of a catalyst, such as dibutyltin oxide, tin[IV] chloride, tin[IV] octoate, hexabutyl distannoxane, tributyltin methoxide, or tributyltin chloride. It is superior in biodegradability and can be produced in low cost.

Abstract: There is disclosed a method for the production of aliphatic copolyester film.The method comprises the steps of: applying esterification or ester-interchange to a reaction mixture of at least one acid component selected from the group consisting of succinic acid, succinic anhydride and succinic acid ester, 1,4-butanediol as a main diol component, 2,2-dimethyl-1,3-propanediol of 1 to 30% by mole based on the mole of the acid component, multifunctional compound 0.01 to 1% by mole, based on the mole of the acid component, multifunctional compound have more than three functional group of hydroxy group or carboxy group at below 220.degree. C., so as to give an oligomer mixture; polycondensing the oligomer into an aliphatic copolyester at a temperature of 240.degree. to 260.degree. C. under reduced pressures of not more than 1 mmHg in the presence of a catalyst; and melt-extruding the aliphatic copolyester using T die.