US4376874A — Real time speech compaction/relay with silence de…

Claim 1

Independent Claim 124 words

A method for compacting and recording an analog signal in real time, comprising the steps of: distinguishing silent periods from audio periods in a received said analog signal; first recording a sync code indicative of the start of said audio periods, upon the detection of each said audio period; second recording a time code indicative of the total elapsed real time since the initialization of the steps of this method of a compacting system; upon detection of each said audio period; and third recording only the analog signal present during said audio periods; whereby the amount of storage media necessary to store said analog signal can be minimized; and whereby said analog signal can be recorded with reference to said total elapsed real time.

Claim 2

Independent Claim 124 words

A method for compacting and recording an analog signal in real time, comprising the steps of: distinguishing silent periods from audio periods in a received said analog signal; first recording a sync code indicative of the start of said audio periods, upon the detection of each said audio period; second recording a time code indicative of the total elapsed real time since the initialization of the steps of this method of a compacting system; upon detection of each said audio period; and third recording only the analog signal present during said audio periods; whereby the amount of storage media necessary to store said analog signal can be minimized; and whereby said analog signal can be recorded with reference to said total elapsed real time.

Claim 3

Dependent Claim 26 words

A method as set forth in claim 1 including the step of digitally encoding the analog signal of said audio periods prior to the recording thereof.

Claim 4

Dependent Claim 57 words

A method as set forth in claim 1 further comprising the step of: fourth recording real time clock sensor data continuously; thereby coincident with said first recording, said second recording, and said third recording of the analog signals of said audio periods; thereby facilitating the real time synchronization of said silent and said audio periods upon replay.

Claim 5

Independent Claim 131 words

A method for replaying analog signals recorded with compaction in real time comprising the steps of: detecting successive ones of sync codes and real time clock codes accompanying an audio period of said analog signal recorded with compaction in real time, plus continuously recorded successive ones of real time clock sensor data; comparing successive ones of said real time clock codes to successive ones of said real time clock sensor data, upon detection of each said sync code; and first replaying said analog signal recorded with compaction in real time each time a match occurs between successive said real time clock codes and said real time clock sensor data; thereby synchronizing said audio periods of said analog signal recorded with compaction in real time with said real time clock sensor data.

Claim 6

Independent Claim 131 words

A method for replaying analog signals recorded with compaction in real time comprising the steps of: detecting successive ones of sync codes and real time clock codes accompanying an audio period of said analog signal recorded with compaction in real time, plus continuously recorded successive ones of real time clock sensor data; comparing successive ones of said real time clock codes to successive ones of said real time clock sensor data, upon detection of each said sync code; and first replaying said analog signal recorded with compaction in real time each time a match occurs between successive said real time clock codes and said real time clock sensor data; thereby synchronizing said audio periods of said analog signal recorded with compaction in real time with said real time clock sensor data.

Claim 7

Dependent Claim 66 words

A method as set forth in claim 4 further comprising the step of: second replaying silence during the real time corresponding to said detected continuously recorded successive ones of real time clock sensor data until each successive said match resultant in said first replaying; thereby replaying a substantially identical analog signal to that which was recorded as said analog signal recorded with compaction in real time.

Claim 8

Dependent Claim 45 words

A method as set forth in claim 5 wherein said silence is replayed at an amplitude substantially identical to the amplitude of the analog signal present upon termination of the previous comparison, thereby minimizing transitions between the amplitudes of the analog signal between successive comparisons.

Claim 9

Dependent Claim 128 words

Apparatus for compacting and recording an analog signal in real time comprising: silence detection means for monitoring and distinguishing audio and silent periods within said analog signal; means for producing a sync code signal when an audio period is detected; means for producing a time code signal reflecting the total elapsed real time since initiation of the apparatus when an audio period is detected; means for recording said sync and said time code signals and said analog signal; and control means for ensuring that only the analog signal occurring during each audio period plus the associated sync and time code signals to said each audio period are recorded; thereby deleting recording of said silent periods and minimizing the amount of recording media necessary to record said analog signal.

Claim 10

Dependent Claim 128 words

Apparatus for compacting and recording an analog signal in real time comprising: silence detection means for monitoring and distinguishing audio and silent periods within said analog signal; means for producing a sync code signal when an audio period is detected; means for producing a time code signal reflecting the total elapsed real time since initiation of the apparatus when an audio period is detected; means for recording said sync and said time code signals and said analog signal; and control means for ensuring that only the analog signal occurring during each audio period plus the associated sync and time code signals to said each audio period are recorded; thereby deleting recording of said silent periods and minimizing the amount of recording media necessary to record said analog signal.

Claim 11

Dependent Claim 95 words

Apparatus as set forth in claim 7 wherein said silence detection means comprises: means for halfwave rectifying said analog signal to produce a halfwave rectified analog signal; means for integrating said analog signal to produce a continuously adjusted threshold envelope signal; means for comparing said threshold envelope signal with said halfwave rectified analog signal; and means for counting the number of times said analog signal exceeds said threshold envelope and depending on the count at the end of each sampling period producing a control signal indicative of silence or the detection of an audio period.

Claim 12

Dependent Claim 18 words

Apparatus as set forth in claim 8 including means for filtering said sampled analog signal of background noise.

Claim 13

Dependent Claim 27 words

Apparatus as set forth in either claim 8 or claim 9 wherein said sampling means includes means for automatically controlling the level of said sampled analog signal.

Claim 14

Dependent Claim 15 words

Apparatus as set forth in claim 10 including means for CVSD encoding said analog signal.

Claim 15

Dependent Claim 23 words

Apparatus as set forth in claim 7 including means for recording a real time clock signal during the compaction of said analog signal.

Claim 16

Dependent Claim 38 words

Apparatus as set forth in claim 8 wherein said sampling means includes shut-off delay means for delaying the termination of each audio period, thereby permitting the recording of silent periods of a duration less than the shut-off delay.

Claim 17

Dependent Claim 77 words

Apparatus for replaying a real time compacted analog signal, comprising: means for detecting a sync code, and a time code in a real time compacted analog signal; means for producing a real time clock signal; means for comparing said time code to said real time clock signal to determine when said audio periods should be replayed, thereby synchronizing said audio periods within the replayed analog signal; and means for replaying silence upon termination of each audio period.

Claim 18

Dependent Claim 77 words

Apparatus for replaying a real time compacted analog signal, comprising: means for detecting a sync code, and a time code in a real time compacted analog signal; means for producing a real time clock signal; means for comparing said time code to said real time clock signal to determine when said audio periods should be replayed, thereby synchronizing said audio periods within the replayed analog signal; and means for replaying silence upon termination of each audio period.

Claim 19

Dependent Claim 37 words

Apparatus as set forth in claim 14 wherein said means for replaying silence replays each silent period at an amplitude substantially identical to the amplitude of the replayed analog signal upon termination of the preceding audio period.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1986-03-14	1986-09-13	1987-03-15	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1990-03-14	1990-09-13	1991-03-15	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1994-03-14	1994-09-13	1995-03-15	$7700.00	Window Closed / Lapsed

Real time speech compaction/relay with silence detection

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag