Boots – shoes – and leggings
Patent
1983-02-17
1987-04-14
Kemeny, E. S. Matt
Boots, shoes, and leggings
381 34, G10L 500
Patent
active
046583696
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
The present invention relates to a sound synthesizing apparatus for achieving compiling synthesization by the use of sound elements extracted from an analog sound waveform. More specifically, the present invention relates to a sound synthesizing apparatus wherein an analog sound signal is converted into a digital signal, data in the vicinity of the trailing end portion of a preceding sound element and data in the vicinity of the leading end portion of a succeeding sound element are shifted relatively and compared with each other, and data of the succeeding sound element is clocked out from a storage means such that the succeeding sound element is connected to the preceding sound element most smoothly.
BACKGROUND ART
Generally, it can be said that the quality of a sound signal (word, phrase, a talking voice) synthesized by connecting compilation of sound elements, i.e. words, syllables, or shorter sound segments is determined by processing of the junction of the sound elements that are the constitution units of a sound. For example, an abrupt change of the waveform occurring at the junction, i.e. the discontinuity of the waveform becomes a cause of a harmonic noise, which degrades a signal to noise ratio of a synthesized sound and the intelligibility. It is also known that a fluctuation of the pitch frequency which is the fundamental frequency of the vocal chords deteriorates the naturalness of a synthesized sound. The auditory sensation of a human being is extremely sensible with respect to the fluctuation of the pitch frequency (the limit of perception is allegedly 0.1 percent) and the discontinuity of the pitch frequency of the connected sound elements makes a synthesized sound offensive and unnatural.
FIG. 1 is a block diagram showing a conventional time axis expanding apparatus. Referring to FIG. 1, the reference numeral 1 denotes a sound input terminal, the reference numeral 2 denotes an output terminal, the reference numerals 3 and 4 denote N-bit analog shift registers of such as BBD, and the reference numeral 5 denotes a low-pass filter (LPF). The reference numerals 6, 7, 8 and 9 denote analog switches, which serves to controllably switch a sound signal being fed from the input terminal 1 through the analog shift register 3 or 4 and the low-pass filter 5 to the output terminal 2. These analog switches are adapted to be on/off controlled, as shown, responsive to the Q and Q outputs of a frequency divider 11 which frequency divides at 2mN (m will be described subsequently) the output of a write clock generator 10 for the analog shift registers 3 and 4.
The analog shift registers 3 and 4 are write clock controlled alternately responsive through OR gates 14 and 15 to the AND gates 12 and 13 of the clock generator 10 and the Q and Q outputs of the frequency divider 11, and read clock controlled alternately responsive through the same OR gates 14 and 15 to the AND gates 17 and 18 of the read clock generator 16 and the Q and Q outputs of the frequency divider 11. More specifically, a sound signal applied to the input terminal the time axis of which has been compressed by m times (m>1), for example, (such compressed signal is obtained by increasing the reproduction speed of a tape recorder by m times as compared with the recording speed, for example) is written into the analog shift register 4 through the analog switch 8 when the Q output of the frequency divider 11 is the logic one. The bit number of the shift register is N and accordingly if the input sound signal is sequentially loaded as a sampled train of the number mN, the trailing end portion of the number N of the sampled train of the number mN is stored in the shift register, the Q output of the frequency divider 11 is reversed to the logic zero, whereby the switch 8 is interrupted. At the same time the Q output of the frequency divider becomes the logic one, whereby the switch 6 is conducted, whereupon the analog shift register 3 effects a write operation in the same manner. As seen from the structure shown in the figure, t
REFERENCES:
patent: Re31172 (1983-03-01), Nishimura et al.
patent: 3369077 (1968-02-01), French et al.
patent: 3575555 (1971-04-01), Schanne
patent: 3588353 (1971-06-01), Martin
patent: 4369336 (1983-01-01), Agnello
patent: 4464784 (1984-08-01), Agnello
Kemeny E. S. Matt
Sanyo Electric Co. Ltd
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