Signal compression system for binary digital signals

A signal compression system, comprising:

• sampling means for sampling at successive constant intervals a binary digital input signal to obtain a sampled binary pulse signal;
• first temporary storage means connected to said sampling means for successively storing therein a predetermined number of bits of the sampled binary pulse signal which constitute a block of bits;
• bit change detecting means connected to said first temporary storage means for producing either a non-detecting output signal or a detection output signal when no bit is detected or when any bit change is detected, respectively, by comparing each of the bits in a block of bits stored in the first temporary storage means with the last bit of a block of bits immediately preceding in time the block of bits stored in said first temporary storage means;
• second temporary storage means connected to said first temporary storage means and said bit change detecting means for storing therein in response to said detection output signal, in a parallel signal configuration, the bits which are stored in said first temporary storage means and transferred to this second temporary storage means at intervals of said predetermined number of bits;
• coding means connected to said bit change detecting means for coding only the duration of the bits in which no bit change is detected as represented by said non-detecting output signal and for developing a coded pulse signal representative of the detected duration;
• and
• signal interlacing means connected to said temporary storage means and said coding means for interlacing said coded pulse signal, or the contents of said second temporary storage means when it contains a blocks of bits having a bit change, with at least one sign bit discriminating them from each other to produce a converted output, so that said coded pulse signal is included in the compressed output in response to said non-detection output signal of said bit change detecting means.