Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Control of information signal processing channel
Reexamination Certificate
2000-07-05
2004-11-16
Korzuch, William (Department: 2653)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Control of information signal processing channel
C369S044270, C369S053370, C369S053450
Reexamination Certificate
active
06819641
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an information recording apparatus and an information recording method, and more particularly to recording ending control and recording restarting control at the time of ending and restarting information recording onto an information storage medium.
2. Description of Related Art
Audio information such as voices and/or music are sometimes recorded on an information storage medium such as an optical disc after they are compressed. If the recording is temporarily interrupted or stopped in response to a temporary recording stop or interruption instruction, the input of audio information to be recorded is stopped after the reception of the instruction. When the recording restart instruction is received, the input of the audio information to be recorded is restarted to restart the information recording.
According to a conventional control method of the recording interruption and restart which controls input state of the audio information to be recorded, if data to be recorded at the time of interruption and restart have large level difference therebetween and the audio information including the interrupted portion is continuously reproduced, a sudden noise may possibly occur at the interruption timing.
This problem may occur at the time of simply stopping the audio information recording and at the time of reproducing recorded information which includes recording interrupted portion recorded with high recording level. This problem may also occur at the time of simply starting new audio information recording and at the time of reproducing recorded information which include recording start portion record with high recording level.
In order to overcome this problem, fade-out and fade-in processing are introduced. Namely, at the time of interruption or ending of recording (hereinafter referred to as “recording interruption time”), the audio information to be recorded is faded out after the recording interruption instruction is received. At the time of restart or start of recording (hereinafter referred to as “recording restart time”), the audio information to be recorded is faded in after the recording restart instruction is received. Thus, the audio information recording level at the recording interruption time and the recording restart time are made substantially zero level. Here, “fade-out” is processing which gradually decreases the recording level of audio information finally down to zero level, and “fade-in” is processing which sets the recording level of audio information to zero at first and then gradually increases the recording level up to a normal level.
However, in the fade-out and fade-in processing, it is necessary to gradually decrease the recording level within a predetermined time period after the instruction of recording interruption, and again gradually increase the level. Therefore, if audio information is recorded after compression, the recording processing becomes complicated.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide information recording apparatus and method which achieve fade-in and fade-out with simple processing and which enable information recording such that undesired sudden noise is avoided at the time of reproducing recorded information at the portion including the recording interruption and restart points.
According to one aspect of the present invention, there is provided an information recording apparatus for recording digital information inputted from outside onto an information storage medium, including: a multiplexing unit for multiplexing the digital information by a plurality of window functions to generate a plurality of multiplied digital information, each of the plurality of window functions having a fade-out time-axis characteristic and having overlaps with neighboring window functions on time axis; a recording unit for recording the plurality of multiplied digital information corresponding to the respective window functions; an ending unit for changing ending multiplexed digital information which are the multiplied digital information corresponding to the window function including a recording end timing of the digital information to zero information, and for ending recording the digital information after recording the zero information onto the information storage medium in place of the ending multiplexed digital information.
According to the same aspect of the present invention, there is provided an information recording method for recording digital information inputted from outside onto an information storage medium, including the steps of: multiplexing the digital information by a plurality of window functions to generate a plurality of multiplied digital information, each of the plurality of window functions having a fade-out time-axis characteristic and having overlaps with neighboring window functions on time axis; recording the plurality of multiplied digital information corresponding to the respective window functions; changing ending multiplexed digital information which are the multiplied digital information corresponding to the window function including a recording end timing of the digital information to zero information, and ending recording the digital information after recording the zero information onto the information storage medium in place of the ending multiplexed digital information.
In accordance with the above information recording apparatus and method, the window functions which are multiplied by the digital information has the time-axis characteristics. When the recording of the digital information is ended, the ending multiplexed digital information is changed to zero information and the recording of the digital information is ended after the zero information is recorded on the information storage medium in place of the ending multiplexed digital information. By this, the recording level variation of the digital information just before the ending of the recording becomes similar to the fade-out characteristic of the window function. Therefore, the fade-out is achieved by a simple processing at the recording ending time of the digital information, and it is possible to avoid noise generation at the time of reproduction, due to the sudden decrease of the digital information recording level.
According to still another aspect of the present invention, there is provided an information recording apparatus for recording digital information inputted from outside onto an information storage medium, including: a multiplexing unit for multiplexing the digital information by a plurality of window functions to generate a plurality of multiplied digital information, each of the plurality of window functions having a fade-in time-axis characteristic and having overlaps with neighboring window functions on time axis; a recording unit for recording the plurality of multiplied digital information corresponding to the respective window functions; a starting unit for changing the multiplied digital information corresponding to the window function including a recording start timing of the digital information to zero information, and for starting recording the digital information to be recorded after the recording start timing, after recording the zero information onto the information storage medium.
According to similar aspect of the invention, there is provided an information recording method for recording digital information inputted from outside onto an information storage medium, including the steps of: multiplexing the digital information by a plurality of window functions to generate a plurality of multiplied digital information, each of the plurality of window functions having a fade-in time-axis characteristic and having overlaps with neighboring window functions on time axis; recording the plurality of multiplied digital information corresponding to the respective window functions; changing the multiplied digital information corresponding to the window function including a recording start timing of the digital informa
Iwamura Hiroshi
Terao Kyoichi
Chu Kim-Kwok
Korzuch William
Pioneer Corporation
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