Data processing: speech signal processing – linguistics – language – Audio signal time compression or expansion
Reexamination Certificate
1998-08-12
2001-09-04
{haeck over (S)}mits, T{overscore (a)}livaldis Ivars (Department: 2641)
Data processing: speech signal processing, linguistics, language
Audio signal time compression or expansion
C386S349000, C386S349000, C704S200100
Reexamination Certificate
active
06285982
ABSTRACT:
BACKGROUND OF INVENTION
This invention relates to a decompressing apparatus for use in a video camera, an electronic still camera, a telephone having a voice recorder or voice mail, and the like.
A sound decompressing apparatus is disclosed in ISO/IEC 11172-3:1993 (E) (MPEG1 Audio), for example, a block diagram of which is shown in FIG.
8
. Referring to
FIG. 8
, a sound input signal is applied to a bit stream unpacking section
801
, which unpacks a bit stream into a header, a bit allocation of each band, a scale factor of each band, and sample data. A requantization section
802
requantizes the sample data based on the scale factor and the bit allocation. A synthesis subband filter
803
synthesizes the bands of the requantized sample data. However, this sound decompressing apparatus is not described in the above-mentioned publication in terms of a method for special reproducing of sounds, also known as trick play, two examples of which are forward search reproducing and reverse search reproducing. The same is also true for the control of gain during special reproducing of sounds.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a sound decompressing apparatus which is capable of executing special reproducing of sounds (trick play).
It is a further object of this invention to provide a sound decompressing apparatus which is capable of adjusting the output level of a sound signal while the apparatus executes special reproducing of sounds.
To achieve the foregoing objects of the present invention, special reproducing of sounds is carried out by processing frames at fixed or predetermined intervals. Furthermore, the output level of a sound signal is adjusted by performing gain control in a series of sound decompressing processes during special reproducing of sounds.
In accordance with the present invention, a data decompressing apparatus includes: an input determination section which detects an indication of special reproducing of sounds; a frame skip section which directs frames of a bit stream to be inputted at fixed or predetermined intervals, the bit stream consisting of frames each containing data of a fixed number of samples; a bit stream unpacking section, which inputs the frames at fixed or predetermined intervals from the bit stream inputted by the input determination section and unpacks each of the frames into a header, a bit allocation of each band, a scale factor of each band and quantized sample data divided into a plurality of frequency components of equal interval; a gain control section which calculates a new scale factor based on the scale factor of each band unformatted by the bit stream unpacking section; a requantization section which requantizes the sample data quantized in the bit stream unpacking section from the bit allocation and the new scale factor; and a synthesis subband filter which synthesizes the bands of the sample data requantized in the requantization section.
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ISO/IEC 11172-3: 1993 (E).
Esaki Tomohiro
Imai Tutomu
Shiokawa Junji
Antonelli Terry Stout & Kraus LLP
Hitachi , Ltd.
{haeck over (S)}mits T{overscore (a)}livaldis Ivars
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