Compressed data recording and/or reproducing apparatus and signal processing method
First Claim
1. Apparatus for recording an information signal as bit-compressed digital data, the apparatus comprising:
- compressor means for receiving the information signal as digital data, the digital data including bits, the bits including redundant bits, and for compressing the digital data to generate the bit-compressed digital data at a variable bit rate, the compressor means removing only the redundant bits from the digital data, the redundant bits being bits that result in a quantizing noise level lower than an allowed noise level at which the quantizing noise is imperceptible to a human auditory sense, the allowable noise level being determined by a masking threshold and a minimum audibility limit; and
recording means, receiving the bit-compressed digital data from the compressor means, for recording the bit-compressed data on a recording medium.
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Abstract
Apparatus for recording an information signal as bit-compressed digital data. The apparatus comprises a bit compressor and a recording system. The bit compressor receives the information signal as digital data. The digital data include bits, and the bits include redundant bits. The bit compressor compresses the digital data by removing only the redundant bits from the digital data to generate the bit-compressed digital data at a variable bit rate. The redundant bits are bits that result in a quantizing noise level lower than an allowed noise level at which the quantizing noise is imperceptible to a human auditory sense. The allowable noise level is determined by a masking threshold and a minimum audibility limit. The recording system receives the bit-compressed digital data from the bit compressor and records the bit-compressed data on a recording medium.
115 Citations
30 Claims
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1. Apparatus for recording an information signal as bit-compressed digital data, the apparatus comprising:
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compressor means for receiving the information signal as digital data, the digital data including bits, the bits including redundant bits, and for compressing the digital data to generate the bit-compressed digital data at a variable bit rate, the compressor means removing only the redundant bits from the digital data, the redundant bits being bits that result in a quantizing noise level lower than an allowed noise level at which the quantizing noise is imperceptible to a human auditory sense, the allowable noise level being determined by a masking threshold and a minimum audibility limit; and recording means, receiving the bit-compressed digital data from the compressor means, for recording the bit-compressed data on a recording medium. - View Dependent Claims (2, 3, 4, 5)
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6. Apparatus for recording and reproducing an information signal as bit-compressed digital data, the apparatus comprising:
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reproducing means for reproducing the information signal from a first recording medium, the information signal being recorded on the first recording medium as bit-compressed digital data at a constant bit rate; and recording means for bit-compressing bit-compressed digital data to generate additionally bit-compressed digital data at a variable bit rate, and for recording the additionally bit-compressed digital data on a second recording medium, the recording means including; compressor means for receiving the information signal as bit-compressed digital data reproduced from the first recording medium by the reproducing means, the bit-compressed digital data including bits, the bits including redundant bits, and for compressing the bit-compressed digital data to generate the additionally bit-compressed digital data, the compressor means removing only the redundant bits from the bit-compressed digital data, the redundant bits being bits of the bit-compressed digital data that give a quantizing noise level lower than an allowable noise level at which the quantizing noise is imperceptible to a human auditory sense, the allowable noise level being determined by a masking threshold and a minimum audibility limit. - View Dependent Claims (7, 8, 9, 10, 11)
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12. Apparatus for recording an information signal as bit-compressed digital data, the apparatus comprising:
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compressor means for receiving the information signal as digital data, the digital data including bits, the bits including redundant bits, and for compressing the digital data to generate the bit-compressed digital data at a variable bit rate, the compressor means removing only the redundant bits from the digital data, the redundant bits being bits that give a quantizing noise level lower than an allowed noise level at which the quantizing noise is imperceptible to a human auditory sense; and recording means, receiving the bit-compressed digital data from the compressor means, for recording the bit-compressed digital data on a recording medium, the recording medium including an IC memory. - View Dependent Claims (13)
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14. Apparatus for recording and reproducing an information signal as bit-compressed digital data, the apparatus comprising:
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reproducing means for reproducing the information signal from a first recording medium, the information signal being recorded on the first recording medium as bit-compressed digital data at a constant bit rate, the first recording medium being a disc; and recording means for bit-compressing bit-compressed digital data to generate additionally bit-compressed digital data at a variable bit rate, and for recording the additionally bit-compressed digital data on a second recording medium, the recording means including; compressor means for receiving the information signal as bit-compressed digital data reproduced from the first recording medium by the reproducing means, the bit-compressed digital data including bits, the bits including redundant bits, and for compressing the bit-compressed digital data to generate the additionally bit-compressed digital data for recording on the second recording medium, the compressor means removing only the redundant bits from the bit-compressed digital data, the redundant bits being bits of the bit-compressed digital data that give a quantizing noise level lower than an allowable noise level at which the quantizing noise is imperceptible to a human auditory sense. - View Dependent Claims (15, 16)
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17. A signal processing method for additionally compressing an information signal that has been processed by bit compression to generate bit-compressed digital data at a constant bit rate, the bit-compressed digital data including bits, the bits including redundant bits, the signal processing method comprising the steps of:
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performing high efficiency encoding of quantizing samples in small blocks obtained by dividing the bit-compressed digital data along both a time axis and a ;
frequency axis to determine the redundant bits; andremoving, from the bit-compressed digital data, only the redundant bits determined by the step of performing high efficiency encoding, the redundant bits being bits of the bit-compressed digital data that give a quantizing noise level lower than an allowable noise level at which the quantizing noise is imperceptible to a human auditory sense. - View Dependent Claims (18)
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19. A signal processing method for additionally compressing an information signal that has been processed by bit compression to generate bit-compressed digital data at a constant bit rate, the bit-compressed digital data including bits, the bits including redundant bits, the signal processing method comprising the steps of:
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performing high efficiency encoding of quantizing samples in small blocks obtained by dividing the bit-compressed digital data along both a time axis and a frequency axis to determine the redundant bits; and removing, from the bit-compressed digital data, only the redundant bits determined by the step of performing high efficiency encoding, the redundant bits being the bits of the bit-compressed digital data that give a quantizing noise level lower than an allowable noise level determined by a masking threshold and by a minimum audibility limit. - View Dependent Claims (20)
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21. Apparatus for recording an information signal as bit-compressed digital data, the apparatus comprising:
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recording means for recording bit-compressed digital data on a recording medium; first compressor means for receiving the information signal as digital data and for bit-compressing the digital data to generate bit-compressed digital data at a constant bit rate; and second compressor means for receiving the bit-compressed digital data at the constant bit rate, the bit-compressed digital data including bits, the bits including redundant bits, and for additionally compressing the bit-compressed digital data to generate additionally-compressed digital data at a variable bit rate for recording by the recording means, the second compressor means removing only the redundant bits from the bit-compressed digital data, the redundant bits being bits that give a quantizing noise level lower than an allowed noise level at which the quantizing noise is imperceptible to a human auditory sense, the second compressor means including; means for performing high efficiency encoding of quantizing samples in small blocks obtained by dividing the bit-compressed digital data along both a time axis and a frequency axis to determine the redundant bits. - View Dependent Claims (22, 23, 24)
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25. Apparatus for recording and reproducing an information signal as bit-compressed digital data, the apparatus comprising:
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reproducing means for reproducing the information signal from a first recording medium, the information signal being recorded on the first recording medium as bit-compressed digital data at a constant bit rate; and recording means for additionally bit-compressing the bit-compressed digital data reproduced from the first recording medium to generate additionally bit-compressed digital data, and for recording the additionally bit-compressed digital data on a second recording medium, the recording means including; compressor means for receiving the bit-compressed digital data reproduced from the first recording medium by the reproducing means, the bit-compressed digital data including bits, the bits including redundant bits, and for additionally compressing the bit-compressed digital data to generate additionally-compressed digital data at a variable bit rate for recording on the second recording medium, the compressor means removing only the redundant bits from the bit-compressed digital data, the redundant bits being bits of the bit-compressed digital data that give a quantizing noise level lower than an allowable noise level at which the quantizing noise is imperceptible to a human auditory sense, the compressor means including; means for performing high efficiency encoding of quantizing samples in small blocks obtained by dividing the bit-compressed digital data divided along both a time axis and a frequency axis to determine the redundant bit. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification