Digital storage system adopting semiconductor memory device
First Claim
1. A digital data storage system, comprising:
- a first semiconductor digital data storage device having an input/output terminal;
a system control microcomputer adapted to generate control signals for controlling operation of said system;
a second semiconductor digital data storage device having a first input/output terminal means and a second input/output terminal means;
a main computer having an input/output terminal means;
a computer interface having a first portion connected to said second input/output terminal means of said second semiconductor digital data storage device and a second portion connected to said input/output terminal means of said main computer;
digital signal processing means having a first input/output terminal means;
memory interface means having a first portion connected to said input/output terminal means of said first semiconductor digital data storage device and a second portion connected to said first input/output terminal means of said digital signal processing means;
wherein said digital signal processing means is responsive to said control signals to selectively execute a playback operation or a record operation;
wherein, during said playback operation, said digital signal processing means functions to read digital data from said first semiconductor digital data storage device via said memory interface means, which functions to buffer said digital data read from said first semiconductor digital data storage device, and further, to transfer said digital data read from said first semiconductor digital data storage device to said second semiconductor digital data storage device;
a memory controller which functions, during said playback operation, to read out said digital data from said second semiconductor digital data storage device to said main computer, via said computer interface, and, during said record operation, functions to control the transfer of digital data to be recorded from said main computer to said second digital data storage device, via said computer interface; and
,wherein, during said record operation, said digital signal processing means functions to transfer said digital data to be recorded from said second digital data storage device to said first digital data storage device, via said memory interface means, for storage therein.
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Abstract
A digital data storage system which does not require the use of moving, mechanical components, and which utilizes semiconductor memory elements, thereby improving the reliability and extending the useful life thereof, and also minimizing the cost, complexity, and size thereof relative to conventional digital data storage systems, such as CD players and DAT devices. In a playback only embodiment, the digital data storage system includes a ROM, a system control microcomputer, a digital signal processor (DSP), and a D/A converter. In operation, the DSP is responsive to control signals generated by the system control microcomputer for reading out digital data, e.g., digital audio data, stored in the ROM, and decoding the read-out digital data. The D/A converter functions to convert the decoded read-out digital data into an analog output signal, e.g., an analog audio signal, and to supply the analog output signal to an output terminal. In a record/playback embodiment, the digital data storage system further includes an A/D converter and an EEPROM, to facilitate the recording of digital data. In operation, during a record mode of operation, the A/D converter functions to convert an input analog signal, e.g., an analog audio signal, into an input digital data signal, and the DSP functions, in response to the control signals, to write the input digital data signal into the EEPROM.
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Citations
16 Claims
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1. A digital data storage system, comprising:
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a first semiconductor digital data storage device having an input/output terminal; a system control microcomputer adapted to generate control signals for controlling operation of said system; a second semiconductor digital data storage device having a first input/output terminal means and a second input/output terminal means; a main computer having an input/output terminal means; a computer interface having a first portion connected to said second input/output terminal means of said second semiconductor digital data storage device and a second portion connected to said input/output terminal means of said main computer; digital signal processing means having a first input/output terminal means; memory interface means having a first portion connected to said input/output terminal means of said first semiconductor digital data storage device and a second portion connected to said first input/output terminal means of said digital signal processing means; wherein said digital signal processing means is responsive to said control signals to selectively execute a playback operation or a record operation; wherein, during said playback operation, said digital signal processing means functions to read digital data from said first semiconductor digital data storage device via said memory interface means, which functions to buffer said digital data read from said first semiconductor digital data storage device, and further, to transfer said digital data read from said first semiconductor digital data storage device to said second semiconductor digital data storage device; a memory controller which functions, during said playback operation, to read out said digital data from said second semiconductor digital data storage device to said main computer, via said computer interface, and, during said record operation, functions to control the transfer of digital data to be recorded from said main computer to said second digital data storage device, via said computer interface; and
,wherein, during said record operation, said digital signal processing means functions to transfer said digital data to be recorded from said second digital data storage device to said first digital data storage device, via said memory interface means, for storage therein. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification