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US 7,120,734 B2Granted
Signal processing circuit for optical disk player having a shared memory for both an anti-shock mechanism and a CD-ROM decoder
AssigneeSanyo Electric Co., Ltd.
InventorNaoyuki Ogino
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Abstract
An external memory (16) is accessed by either a CD-ROM decoder (10) or an anti-shock controller (12) through an interface. Thus, a single memory can be shared for two purposes, allowing both audio data and MP3 data to be reproduced in an efficient manner.
Claims13
A signal processing circuit processing a signal reproduced from a CD, comprising:
- a CD-ROM decoder decoding incoming CD-ROM data by using a memory;
- and
- an anti-shock controller causing a predetermined amount of incoming audio data to be stored in said memory, and reading and outputting the audio data from said memory, so that continuous output can be achieved even when the incoming audio data is interrupted;
- wherein
- said CD-ROM decoder and said anti-shock controller access said memory;
- and
- said memory is divided into an area used for decoding the CD-ROM data, and an area where the audio data is stored.
4 more elements
A signal processing circuit processing a signal reproduced from a CD in which a CD-ROM data or CD-DA data is written, comprising:
- a memory;
- a CD-ROM decoder writing, when the CD from which the signal is to be reproduced is a CD-ROM, incoming CD-ROM data into said memory, and decoding said CD-ROM data while reading out the CD-ROM data from said memory;
- an anti-shock controller causing, when the CD from which the signal is to be reproduced is a CD-DA, a predetermined amount of incoming CD-DA audio data to be stored in said memory, and reading and outputting the audio data from said memory, so that continuous output can be achieved even when the incoming audio data is interrupted;
- an MP3 decoder performing MP3 decoding on data encoded in MP3 format and output from said CD-ROM decoder;
- a first arbiter generating an output signal for controlling said memory in the order of priority according to a plurality of request signals from said CD-ROM decoder or a readout signal received from the MP3 decoder;
- a second arbiter generating an output signal for controlling said memory according to a request signal from said anti-shock controller;
- and
- a selection circuit selecting an output signal from said first or second arbiter;
- wherein an output signal from said first arbiter is selected by said selection circuit when the CD from which the signal is to be reproduced is a CD-ROM, and, when the CD from which the signal is to be reproduced is a CD-DA, an output signal from said second arbiter is selected by said selection circuit.
6 more elements
Dependencies are inferred from the claim text.