Usually in high-efficiency coding such as MPEG a regular digital signal whose sampling rate is from 32 to 48 kHz, and number of quantification bits from 12 to 16 bits are used. High-speed, 1-bit coding is proposed. Generalized harmonic analysis is simple. A sinusoid that minimizes the power of the residual waveform is found and extracted from the original waveform. The same procedure is carried out by substituting the weakest residual waveform for the original waveform. The frequency component can be extracted correctly. High-efficiency, high-speed, 1-bit coding using generalized harmonic analysis is reported here.