Electrical audio signal processing systems and devices – With mixer
Reexamination Certificate
1998-02-25
2001-07-10
Mei, Xu (Department: 2644)
Electrical audio signal processing systems and devices
With mixer
C381S063000, C381S109000, C369S003000
Reexamination Certificate
active
06259793
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and an apparatus for continuously reproducing plural sound data, and a method and an apparatus for creating plural sound data for the purpose of continuous reproduction. More particularly, the invention relates to an improved sound reproduction technique for continuously reproducing realistic environmental sound such as sound of hustle and bustle, chirping of small birds, background music or the like, with as small sound source data as possible.
2. Description of the Prior Art
In various amusement apparatuses and facilities, environmental sound is indispensable for producing atmosphere. There is a technique that, in reproducing such environmental sound for a predetermined duration, in order to minimize the amount of data forming the sound source, short sound data are repeatedly read out to give an impression that continuous sounds were reproduced.
FIG. 1
is a block diagram showing a conventional system constitution for continuously reproducing the plural sound data. The system is provided with a reproduction process unit
51
, a terminal end determination unit
52
, a data output unit
53
, and a reproduction unit
54
. In the case of continuous reproduction of continued sound data, the reproduction process unit
51
repeats the process of reading the sound data to be reproduced, and writing said sound data to the data output unit
53
. Further, the sound data written to if the data output unit
53
are outputted to the reproduction unit
54
such as a speaker. In such sequential processes, the position of the sound data read by the reproduction process unit
51
in the whole data is monitored by the terminal end determination unit
52
. When the position reaches the terminal end of certain sound data, a terminal end signal is sent from the terminal end determination unit
52
to the reproduction process unit
51
and reading and writing of the next sound data are carried out. In this manner, the plural sound data are continuously reproduced.
FIG. 2
is a conceptual view showing the reproduction condition of the continuous sound data in the conventional case.
The continuous sound data may be the sound data of the same kind or the sound data of different kinds. In the case of the sound data of the same kind, reading and writing are performed on the same sound data and the same sound data are to be repeatedly reproduced.
In the conventional system as described above, the system simply reads the beginning end of the next sound data after reading the terminal end of the previous sound data in reproducing plural sound data continuously. Accordingly, there may be cases in which discontinuity occurs at the juncture between the terminal end of the previous sound data and the beginning end of the next sound data. Thus, a noise like a click sound can be generated, thereby giving discomfort to the listeners.
BRIEF SUMMARY OF THE INVENTION
An object of the present invention is to provide a sound reproduction method and a sound reproduction apparatus wherein, in reproducing plural sound data continuously, no noise is formed at the joint between the adjacent sound data.
Another object of the present invention is to provide a sound data reproduction method and a sound data reproduction apparatus in which it is possible to create a plurality of continued sound data which do not generate noise at the joint at the time of reproduction.
According to the sound reproduction apparatus of the invention, fade-in process or fade-out process is carried out at the start end and/or the terminal end of continued respective sound data. Accordingly, generation of noise at the joint of the adjacent sound data can be prevented, and no unpleasant feeling is given to the listeners.
According to the sound data creation apparatus of the invention, the processed sound data subjected to fade-in process or fade-out process at the start end and/or the terminal end of the continued respective sound data are created and retained. Accordingly, using the processed sound data thus created, the sound having no noise at the joint of the adjacent sound data can be offered to the listeners for repeated times.
The above and further objects and features of the invention will more fully be apparent from the following detailed description with accompanying drawings.
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Washio Nobuyuki
Yamazaki Yasushi
Fujitsu Limited
Mei Xu
Staas & Halsey , LLP
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