Process for storing digitally coded video synchronous sound signals through time compression by duplicating sound data during recordation

• US 4,717,972 A
• Filed: 01/17/1986
• Issued: 01/05/1988
• Est. Priority Date: 07/06/1984
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Heitmann, Jurgen
• Primary Examiner(s): PSITOS, ARISTOTELIS
• Application Number:
  US06/840,572
• Time in Patent Office: 718 Days
• Field of Search: 360/13, 360/32, 360/8, 360/19.1, 358/343, 358/342
• US Class Current: 360/8
• CPC Class Codes: G11B 2220/90 Tape-like record carriers
• CPC Class Codes: G11B 27/032 on tapes G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 27/10 Indexing; Addressing; Timing or synchronising; Measuring tape travel
• CPC Class Codes: H04N 5/928 the sound signal being pulse code modulated and recorded in time division multiplex with the modulated video signal
• CPC Class Codes: H04N 9/802 involving processing of the sound signal H04N9/806, H04N9/835 take precedence

Abstract

A process for storing picture synchronous sound signals is provided. The sound signals are divided into segments for this purpose, whose cycle is equal to the cycle of the associated video signal segments. In addition to the sound data of the actual video signal segment each sound signal segment also includes one portion of the sound data of the preceding video signal segment and the subsequent video signal segment. The sound signal segments are time compressed to the length of the video signal segments for recording or transmitting. The sound signals can be softly changed over due to overlapping during backplay and cutting.

Claims

1. A process for storing a plurality of digitally coded sound signals that are synchronous with video signals, the process comprising steps of:

providing a plurality of successive sound data signal segments associated with a successive plurality of video data signal segments, each of the sound data signal segments being digitally coded with sound data synchronously associated with a time cycle of a respective one of the video data signal segments, the video data signal segments constituting a plurality of immediately preceding and succeeding video data segments relative to each other, the sound data associated with the video data segments constituting a first and second half of the sound data;

time compressing the sound data; and

editing into a time period corresponding to the time cycle of the respective one of the video data signal segments, a reproduction of a second half of the time compressed sound data associated with the immediately preceding video data signal segment and a reproduction of a first half of the time compressed sound data associated with the immediately succeeding video data signal segment in addition to the time compressed sound data synchronously associated with the respective one video data signal segment so as to store a 100% redundancy of the sound data during the time period.

2. The process in accordance with claim 1, wherein the edited time period corresponds to the time cycle of one video data signal segment representing a half video frame.

3. The process in accordance with claim 1, wherein the edited time period corresponds to the time cycle of one video data signal segment representing a full video frame.

4. The process in accordance with claim 1, wherein the editing includes editing the time compressed sound data signal segments at a predetermined editing location during a transmission from one video data signal segment to an immediately succeeding video data signal segment by placing sound data on top of each other at the predetermined editing location to thereby overlap identical data segments.

5. A process for storing and reproducing a plurality of digitally coded sound signals that are synchronous with video signals, the process comprising steps of:

providing a plurality of successive sound data signal segments associated with a successive plurality of video data signal segments, each of the sound data signal segments being digitally coded with sound data synchronously associated with a time cycle of a respective one of the video data signal segments, the video data signal segments constituting a plurality of immediately preceding and succeeding video data segments relative to each other, the sound data associated with the video data segments constituting a first and second half of the sound data;

time compressing the sound data;

editing into a time period corresonding to the time cycle of the respective one of the video data signal segments, a reproduction of a second half of the time compressed sound data associated with the immediately preceding video data signal segment and a reproduction of a first half of the time compressed sound data associated with the immediately succeeding video data signal segment in addition to the time compressed sound data synchronously associated with the respective one video data signal segment so as to store a 100% redundancy of the sound data during the time period, the storing producing overlaps of the successive sound signals;

backplaying the time compressed sound signal segments; and

changing the time compressed sound signal segments during the backplaying so that a signal of an outgoing time compressed sound signal segment changes from a maximum to a minimum value and an incoming time compressed sound signal segment changes from a minimum to a maximum value so as to effect a changeover interval between idential sound data which were time compressed for adjacent time cycles.

6. A process for storing and reproducing a plurality of digitally coded sound signals that are synchronous with video signals, the process comprising steps of:

providing a plurality of successive sound data signal segments associated with a successive plurality of video data signal segments, each of the sound data signal segments being digitally coded with sound data synchronously associated with a time cycle of a respective one of the video data signal segments, the video data signal segments constituting a plurality of immediately preceding and succeeding video data segments relative to each other, the sound data associated with the video data segments constituting a first and second half of the sound data;

time compressing the sound data;

editing into a time period corresponding to the time cycle of the respective one of the video data signal segments, a reproduction of a second half of the time compressed sound data associated with the immediately preceding video data signal segment and a reproduction of a first half of the time compressed sound data associated with the immediately succeeding video data signal segment in addition to the time compressed sound data synchronously associated with the respective one video data signal segment so as to store a 100% redundancy of the sound data during the time period;

backplaying the time compressed sound signal data segments; and

time expanding the sound data signal segments during the backplaying.