Dynamic information storage or retrieval – Information location or remote operator actuated control – Dictation or transcribing
Reexamination Certificate
1999-10-15
2001-06-26
Dinh, Tan (Department: 2651)
Dynamic information storage or retrieval
Information location or remote operator actuated control
Dictation or transcribing
Reexamination Certificate
active
06252830
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a real-time compressing and decompressing apparatus for recording and reproducing multi-soundtrack voice data, especially to a real-time apparatus for decompressing and reproducing the compressed multi-soundtrack voice data download from computer network or fetched from replaceable memory card, and compressing and recording the voice data to replaceable memory card without using computer.
BACKGROUND OF THE INVENTION
The music compressed in MP3 (MPEG Audio Layer-3) format becomes more and more popular. MP3 is a data compression/decompression standard subordinate to MPEG (movie picture experts group) by which the audio can be compressed to {fraction (1/10)} or {fraction (1/12)} storage amount. For example, the MP3 audio CD can store about 100 songs of ordinary playing time. However, the MP3 audio CD is generally reproduced by computer rather than CD player. Therefore, the reproducing apparatus and method for MP3 music are under extensive research for easier use.
FIG. 1
shows the system block according to a prior art data compression method
100
a
. The prior art data compression method
100
a
comprises steps of reading two adjacent data in the content table of compact disk, which represent the absolute playing time of compact disk and are stored in the content table in a first carry format; subtracting the two adjacent data in the content table to obtain a relative data representing the relative playing time of the compact disk; converting the relative data to a plurality of values in a second carry format; storing the non-zero ones of the plurality of values and indicating the byte number of non-zero values by a flag.
However, the above mentioned prior art has following drawbacks:
1. The recording and reproducing operations can not be performed simultaneously due to lack of real-time decompressing step.
2. The data is read from compact disk and can not be read from other source such as computer network or audio means.
3. The compressed data is stored in the volatile data memory such as RAM of the micro-controller, the data preservation is limited by power.
FIG. 2
shows the system block diagram of another prior art wherein a hand-held and flash memory based voice recording/reproducing device for language learning is disclosed. The hand-held voice recording/reproducing device comprises a CPU
1
a
, an input unit
2
a
connected to the CPU
1
a
, a liquid crystal display unit
3
a
, a system memory
4
a
, a database memory
5
a
, an audio output
6
a
, a first playback key, a DSP unit
7
a
, and a A/D converter
8
a
. The user input the command thereof through the input unit
2
a
such that the CPU
1
a
reads an object text data from the database memory
5
a
. Afterward, the object text data is displayed on the liquid crystal display unit
3
a
. The first playback key is pressed to generate an object voice data reading signal by which an object voice data is read and processed by the A/D DSP unit
7
a
and the converter
8
a
, and then enhanced through the audio output
6
a
. The prior art hand-held voice recording/reproducing device is characterized in that the A/D converter
8
a
is further connected to a microphone
9
a
, and the CPU
1
a
is electrically connected to a separable flash memory
13
a
, a recording key and a second playback key. The recording key provides a recording control signal to the CPU
1
a
such that the microphone
9
a
receives the analog voice data corresponding to the object voice data. The analog voice data is converted to a digital voice data and compressed by the DSP unit
7
a
, and then stored in the flash memory
13
a
. The second playback key provides a voice reading signal to the CPU
1
a
such that the voice data stored in the flash memory
13
a
is decompressed by the DSP unit
7
a
and then converted to an audio voice. The audio voice is sent to the audio output
6
a
for enhancing.
However, the above-mentioned voice recording/reproducing device for language learning has following drawbacks:
1. The power supply
14
thereof has no long-term primary and secondary power control module. Therefore, the above-mentioned voice recording/reproducing device has only primary power supply for liquid crystal display and does not have secondary power supply for memory.
2. The flash memory
13
a
used in the above-mentioned voice recording/ reproducing device is costly and the device has not the ability to charge the primary and secondary power supply when using the flash memory.
3. The voice signal can not be transmitted through the path from the CPU
1
a
to the flash memory
13
a
.
4. The system memory
4
a
and the database memory
5
a
are provided for read only data, thus being not rewritable. It is not suitable for the application of real-time compressing and decompressing voice data.
5. The input unit
2
a
does not have expansion control code unit, the mode of input means is limited.
6. The above-mentioned voice recording/reproducing device uses liquid crystal display unit
3
a
only, and does not use other display device such as plasma display.
It is the object of the present invention to provide a real-time compressing and decompressing apparatus for recording and reproducing multi-soundtrack voice data, which can overcome the above mentioned problems.
To achieve the object, the present invention provides a real-time compressing and decompressing apparatus for recording and reproducing multi-soundtrack voice data. The real-time compressing and decompressing apparatus comprises a real-time decompressing module for reproducing digital voice; a pre-module for real-time compressing digital voice; a long-term primary and secondary power control module; a controllable working-frequency adjusting module; a linking module for supplying power; and a digital voice memory module. Therefore, the digital voice is not distorted, the voice data is read directly from computer network and audio input unit and real-time compressed to store in memory. Moreover, the decompression operation is performed simultaneously with the compression operation to real-time playback voice data. The data can be sustained for long time. The present invention provides primary power for main operation and secondary power for memory storage, and uses SDRAM in place of flash memory to reduce cost.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which:
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patent: 5806038 (1998-09-01), Huang et al.
patent: 5842123 (1998-11-01), Hamamoto et al.
patent: 6016472 (2000-01-01), Ali
patent: 6038199 (2000-03-01), Pawlowski et al.
patent: 6061306 (2000-05-01), Buchheim
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Dinh Tan
Rosenberg , Klein & Lee
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