Ringing decoder circuit
First Claim
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1. A ringing decoder circuit for decoding coded ringing signals comprising at least one sequence of long and/or shot bursts of ringing signals, comprising:
- (a) means for counting the total number of bursts in a sequence,(b) means for detecting the length of the final burst in the sequence relative to a first predetermined interval, and(c) means for indicating the reception of a predetermined code in the event the number of bursts and the relative length of the final burst in the sequence match a predetermined indicated number and relative length respectively.
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Abstract
A telephone system automatic ringing code decoder useful to provide single party ringing on a multi-party telephone line. The decoder counts the number of ring bursts and detects the length of the last ring burst in the first ring burst code sequence and compares it with a preselected code. Upon finding a match, it provides an output on an SEL lead, indicating that further ringing can be applied to a subscriber'"'"'s set ringer.
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Citations
14 Claims
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1. A ringing decoder circuit for decoding coded ringing signals comprising at least one sequence of long and/or shot bursts of ringing signals, comprising:
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(a) means for counting the total number of bursts in a sequence, (b) means for detecting the length of the final burst in the sequence relative to a first predetermined interval, and (c) means for indicating the reception of a predetermined code in the event the number of bursts and the relative length of the final burst in the sequence match a predetermined indicated number and relative length respectively. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A ringing decoder for decoding coded ringing signals comprising repetitive sequences of long and short bursts of ringing signal comprising:
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(a) means for converting the ringing signals into pulse signals at the ringing frequency, (b) means for lengthening each pulse of said pulse signals to a 100% duty cycle at the ringing frequency, so as to form a ringing signal burst envelope, (c) means for counting the total number of burst envelopes in a first code sequence of ring bursts, (d) means for detecting the length of the final burst in said sequence as being in excess of or less than a predetermined time period, and (e) means for indicating the reception of a predetermined ringing code in the event the number of bursts and the length of the final burst in said first sequence respectively match a predetermined number and predetermined length thereof. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification