Video signal encoding and recording apparatus with variable transmission rate
First Claim
1. A video signal encoding and recording apparatus comprising:
- first means for quantizing a video signal into a quantization-resultant signal in response to a variable quantization scale;
second means for recording the quantization-resultant signal generated by the first means on a recording medium;
third means for controlling the quantization scale used by the first means in response to an encoding rate;
fourth means for limiting the quantization scale used by the first means to within a range determined by a limit quantization scale;
fifth means for measuring a remaining record capacity of the recording medium;
sixth means for measuring a remaining record time; and
seventh means for updating the encoding rate used by the third means and the limit quantization scale used by the fourth means in response to the remaining record capacity measured by the fifth means and the remaining record time measured by the sixth means.
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Abstract
In a video signal encoding and recording apparatus, a video signal is quantized into a quantization-resultant signal in response to a variable quantization scale. The quantization-resultant signal is recorded on a recording medium. The quantization scale is controlled in response to an encoding rate. The quantization scale is limited to within a range determined by a limit quantization scale. A remaining record capacity of the recording medium is measured. A remaining record time is measured. The encoding rate and the limit quantization scale are updated in response to the measured remaining record capacity and the measured remaining record time.
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Citations
14 Claims
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1. A video signal encoding and recording apparatus comprising:
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first means for quantizing a video signal into a quantization-resultant signal in response to a variable quantization scale;
second means for recording the quantization-resultant signal generated by the first means on a recording medium;
third means for controlling the quantization scale used by the first means in response to an encoding rate;
fourth means for limiting the quantization scale used by the first means to within a range determined by a limit quantization scale;
fifth means for measuring a remaining record capacity of the recording medium;
sixth means for measuring a remaining record time; and
seventh means for updating the encoding rate used by the third means and the limit quantization scale used by the fourth means in response to the remaining record capacity measured by the fifth means and the remaining record time measured by the sixth means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 12, 13)
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8. A video signal encoding and recording apparatus comprising:
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first means for quantizing a video signal into a quantization-resultant signal in response to a variable quantization step;
second means for recording the quantization-resultant signal generated by the first means on a recording medium;
third means for calculating a remaining record capacity of the recording medium;
fourth means for determining a capacity of a virtual buffer in response to the remaining record capacity calculated by the third means;
fifth means for calculating a degree of occupancy of the virtual buffer having the capacity determined by the fourth means; and
sixth means for controlling the quantization step used by the first means in response to the virtual-buffer occupancy degree calculated by the fifth means. - View Dependent Claims (9)
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10. A method of encoding and recording a video signal, comprising the steps of:
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quantizing a video signal into a quantization-resultant signal in response to a variable quantization step;
recording the quantization-resultant signal on a recording medium;
calculating a remaining record capacity of the recording medium;
determining a capacity of a virtual buffer in response to the calculated remaining record capacity;
calculating a degree of occupancy of the virtual buffer having the determined capacity; and
controlling the quantization step in response to the calculated virtual-buffer occupancy degree. - View Dependent Claims (11)
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14. A method comprising the steps of:
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1) quantizing a video signal into a quantization-resultant signal in response to a variable quantization scale;
2) recording the quantization-resultant signal generated by the step
1) on a recording medium;
3) controlling the quantization scale used by the step
1) in response to an encoding rate;
4) limiting the quantization scale used by the step
1) to within a range determined by a limit quantization scale;
5) measuring a remaining record capacity of the recording medium;
6) measuring a remaining record time; and
7) updating the encoding rate used by the step
3) and the limit quantization scale used by the step
4) in response to the remaining record capacity measured by the step
5) and the remaining record time measured by the step
6).
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Specification