Information processor for changing tempo of playback from the recorded tempo

Claim 1

A circuit arrangement for playing back recorded information in a tempo which differs from the original recording tempo, and particularly for playing back retarded or accelerated speech while maintaining the correct pitch, said circuit arrangement comprising: a first shift register having an input, an output, and an auxiliary output; a second shift register having an input, an output, and an auxiliary output; means for supplying information in a desired tempo to said registers; a first electronic switch disposed between said registers and said information supplying means to alternately apply said information to said registers; a second electronic switch operated in phase opposition to said first switch, said second electronic switch connected to said registers for alternatively deriving an output signal therefrom; means for supplying said registers with clock pulses for advancing information therethrough; first switching means disposed between said registers and said clock pulse supplying means, for alternately, but in phase opposition, applying said clock pulses to said registers, frequencies of said clock pulses jumping from one value to another at each change-over of said switching means, a ratio of these frequencies being equal to a speed ratio between the speed at which said information is applied to the shift registers and the speed at which said information is recorded; and second switching means connected to respective registers, for connecting the respective auxiliary output of each register to the input of said respective register, said respective auxiliary outputs being partway along said registers between said inputs and said outputs such that said information at said auxiliary output is less advanced in said register than that corresponding to said respective output signal.