Patent ID: 6876617

Claim:
A recorder for recording data on a recording medium, comprising: a first data output device which outputs sample data, the sample data being formed by sampling information to be recorded at a given cycle and quantizing the thus-sample data into data having a predetermined number of bits; a re-quantization device which re-quantizes the data output from the first data output device into data whose number of bits is smaller than the predetermined number of bits; a first writing device which records, at a predetermined recording density, data on a predetermined recording layer of the recording medium on the basis of the data, which has been re-quantized by the re-quantization device; a second data output device which outputs data, the data being produced by sampling the information to be recorded at a cycle shorter than the predetermined cycle and quantizing the thus-sampled information into data having a predetermined number of bits; a separation device for dividing the data output from the second data output device into a plurality of sample data sets which have been sampled at the predetermined cycle and at different times; a subtraction device which calculates a difference between the data output from the re-quantization device and the predetermined sample data output from the separation device; a multiplexing device which multiplexes into a single data set the data output from the subtraction device and the sample data, which are output from the separation device but differ from the predetermined sample data; and a second writing device for recording data on the recording layer of the recording medium on the basis of the data, which have been multiplexed by the multiplexing device, at a recording density higher than that at which the first writing device records data.