Data transmission and reception apparatus and method
AssigneeSony Corporation
InventorsYoichiro Sako, Kentaro Odaka
Life of this patent
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Abstract
A data transmission and reception apparatus and method capable of selecting either of two modes having the same sampling frequency in which the bit numbers of one data unit are either m or n (which are integral numbers and m>n), while using the same error correction encoder and decoder for the two modes, by inserting m-n bits of dummy data bits into the n-bit data so as to handle it as m-bit data during the processes of error correction encoding and decoding.
Claims38
A data transmission apparatus capable of selecting a first mode in which one unit of data is made up of m bits and a second mode in which one unit of data is composed of n bits (m>n), where m and n are integral numbers, with the same sampling frequency, comprising:
- (a) error correction encoding means commonly used for the first and second modes;
- (b) first insertion means for inserting m-n bits of dummy data into the units of data;
- (c) first elimination means for eliminating the inserted bits from the data;
- and
- (d) addition means for adding an information header, including at least a block synchronization signal to define blocks of data units, to the data,
- wherein in the first mode, data units composed of m bits each are encoded by the error correction encoding means to produce first mode, encoding-processed data, the addition means adds a first block synchronization signal to each block of the first mode encoding-processed data and outputs it, and data output from the addition means is transmitted, and
- in the second mode, the first insertion means inserts bits in each data unit composed of n bits so as to transform it into one unit of m-bit data which is supplied to the error correction encoding means where it is encoded and output as second mode encoding-processed data, the first elimination means eliminates the inserted bits from the output second mode encoding-processed data so as to output units of n bit data, these units of n bit data from the first elimination means are supplied to the addition means which adds a second block synchronization signal to each block of n-bit data and transmits it.
Apparatus for receiving data selectively transmitted in a first mode in which one unit is made up of m-bits or in second mode in which one unit is composed of n-bits (m>n), where m and n are integral numbers, with the same sampling frequency, comprising:
- (a) switching signal generating means for deciding whether the received data is in the first mode or the second mode and generating a corresponding mode switching signal;
- (b) insertion means for selectively inserting m-n bits of dummy data into each n-bit data unit;
- (c) error correction decoding means used commonly for the first and second modes;
- and
- (d) elimination means for eliminating the inserted bits from the data;
- wherein when the mode switching signal corresponds to the first mode, the error correction decoding means performs error correction decoding of the received data ad the m-bit data units are decoded,
- when the mode switching signal corresponds to the second mode, the received data is supplied to the insertion means so that the inserted bits are inserted into each n-bit data unit to make m-bit data units, this data is supplied to the error correction decoding means where the data is decoding-processed, and the decoding-processed data is fed to the elimination means and the inserted bits are eliminated so as to decode the n-bit data units.
Apparatus for recording a PCM audio signal on a magnetic medium by magnetic heads, capable of selecting a first mode in which one data unit is made up of m-bits and a second mode in which one data unit is composed of n-bits (m>n), where m and n are integral numbers, with the same sampling frequency, comprising:
- (a) error correction encoding means commonly used for the first and second modes;
- (b) insertion means for inserting m-n bits of dummy data into the data units;
- (c) elimination means for eliminating the inserted bits from the data;
- and
- (d) addition means for adding to the data an information header including at least a block synchronization signal to define blocks of data units,
- wherein in the first mode, data units composed of m-bits each are subjected to an encoding process at the error correction encoding means to produce first mode, encoding-processed data, a block synchronization signal for the m-bit data is added to define each block of the first mode, encoding-processed data at the addition means, and data output from the addition means is transmitted, and
- wherein in the second mode, the inserted bits are inserted into each n-bit data unit at the insertion means so as to make an m-bit data unit, the m-bit data units are encoded by the error correction encoding means to produce second mode, encoding-processed data, the inserted bits are eliminated from the second mode, encoding-processed data at the elimination means to produce n-bit data units which are supplied to the addition means where a block synchronization signal for n-bit data is added to each block of n-bit data and each such block is thereafter transmitted to the magnetic heads and magnetically recorded.
A data transmission method for selecting a first mode in which one unit of data is made up of m-bits and a second mode in which one unit of data is composed of n-bits (m>n), where m and n are integral numbers, with the same sampling frequency, comprising the steps of:
- adding an information header, including at least a block synchronization signal to define blocks of data units, to the data,
- in the first mode, error correction encoding data units composed of m-bits each to produce first mode error-corrected data, adding a first block synchronization signal to each block of the first mode error-corrected data and transmitting it;
- and
- in the second mode, inserting m-n bits of dummy data into each n-bit data unit so as to make it an m-bit data unit, error correction encoding the m-bit data units to produce second mode error corrected data, eliminating the inserted bits from the second mode error corrected data so as to output n-bit data units, adding a second block synchronization signal to each block of n-bit data units and transmitting it.
A method for receiving data selectively transmitted in a first mode in which one unit is made up of m-bits or in second mode in which one unit is composed of n-bits (m>n), where m and n are integral numbers, with the same sampling frequency, comprising the steps of:
- (a) deciding whether the received data is in the first mode or the second mode and generating a corresponding mode switching signal;
- (b) when the mode switching signal corresponds to the first mode, error correction decoding the received data to generate decoded m-bit data units;
- (c) when the mode switching signal corresponds to the second mode,
- (i) inserting m-n bits of dummy data into each n-bit data unit to make an m-bit data unit,
- (ii) error-correcting the m-bit data units, and
- (iii) eliminating the inserted bits from the decoding-processed data so as to decode the n-bit data units.
A method for recording a PCM audio signal on a magnetic medium by magnetic heads, capable of selecting a first mode in which one data unit is made up of m-bits and a second mode in which one data unit is composed of n-bits (m>n), where m and n are integral numbers, with the same sampling frequency, comprising the steps of:
- in the first mode, error correction encoding data units composed of m-bits each, adding a first block synchronization signal to each block of the error correction encoded data and transmitting it;
- and
- in the second mode, inserting m-n bits of dummy data into each n-bit data unit so as to make and m-bit data unit, error correction encoding the thus produced m-bit data units to produce encoding-processed data, eliminating the m-n bits from the encoding-processed data to produce n-bit data units, adding an information header including at least a second block synchronization signal to each block of n-bit data units and transmitting it to the magnetic heads and magnetically recording it.
Dependencies are inferred from the claim text.