Asynchronous sample pulse generator

Apparatus for generating signals for sampling data signals asynchronously received at a prescribed bit rate on at least one channel which comprises:

• means for generating a plurality of timing signals in predetermined phase relationship, including
• counter means for generating a first pulsating signal having a frequency which is a predetermined multiple of said prescribed bit rate, a second pulsating signal having a frequency the same as said first pulsating signal and oppositely phased and a third pulsating signal having a predetermined phase relationship to said first and second pulsating signals, and
• digital divider means responsive to said first pulsating signal for generating first and second predetermined ones of said timing signals;
• means associated with said at least one channel and being responsive to said second pulsating signal and to prescribed signals incoming on said at least one channel for generating a first prescribed signal and a second prescribed signal at an instant when said first and second predetermined ones of said timing signals are not changing state;
• storage means associated with said at least one channel and being responsive to said first prescribed signal for sampling and storing signals representative of said first predetermined ones of said timing signals;
• and
• means associated with said storage means and being supplied with said stored signals and with said second predetermined ones of said timing signals for generating output signals during intervals in which said first and second predetermined ones of said timing signals are in coincidence, wherein said first and second predetermined ones of said timing signals are in said predetermined phase relationship so that an output signal is generated substantially mid-interval of each data bit incoming on said at least one channel.

Apparatus for generating signals for sampling incoming data signals asynchronously received at a prescribed bit rate on a plurality of channels which comprises:

• means for generating a plurality of timing signals in predetermined phase relationship ordered from least significant to most significant and including a timing signal opposite in phase to said most significant timing signal, a first predetermined group of said timing signals including the least significant one through the next to most significant one of said timing signals and the signal opposite in phase to said most significant timing signal, and a second predetermined group of said timing signals including the least significant one through the most significant one of said timing signals;
• and
• a plurality of first means supplied with said timing signals and being associated on a one-to-one basis with said incoming channels, each of said first means including storage means responsive to a first prescribed signal for sampling and storing signals representative of one of said predetermined groups of said timing signals, and
• means associated with said storage means and being supplied with said stored signals and with the other of said predetermined groups of said timing signals for generating output signals during intervals in which said first and second predetermined groups of said timing signals are in coincidence, wherein said first and second predetermined groups of said timing signals are in said predetermined phase relationship so that said output signals are generated substantially mid-interval of each data bit incoming on said associated channel.

Apparatus for generating signals for sampling incoming data signals asynchronously received at a prescribed bit rate on a plurality of channels which comprises:

• timing signal generating means including
• counter means responsive to a supplied signal for generating a first pulsating signal having a frequency which is a predetermined multiple of said prescribed bit rate, a second pulsating signal having a frequency the same as said first pulsating signal and oppositely phased and a third pulsating signal in predetermined phase relationship to said first and second pulsating signals, and
• digital divider means responsive to said first pulsating signal for generating a plurality of timing signals in predetermined phase relationship;
• and
• a plurality of first means supplied with said timing signals and being associated on a one-to-one basis with said channels, each including
• means responsive to prescribed signals incoming on an associated channel and to said second pulsating signal for generating first and second prescribed signals at an instant when said timing signals generated by said divider means are not changing state,
• storage means responsive to said first prescribed signal for sampling and storing signals representative of first predetermined ones of said divider means timing signals,
• comparator means responsive to said second prescribed signal for effecting a comparison between said stored first predetermined ones of said timing signals and second predetermined ones of said divider means timing signals, wherein said comparator means yields an output during intervals that said first and second predetermined ones of said timing signals are in coincidence, and
• means supplied with the output from said comparator means and said third pulsating signal for generating signals for sampling data bits on said associated channel during intervals of coincidence between said comparator means output and said third pulsating signal, wherein said first and second predetermined ones of said timing signals are in said predetermined phase relationship so that said sampling signals are generated substantially mid-interval of each data bit incoming on said associated channel.