Overload detection in an arrangement for recording an analog signal on a record carrier

• US 5,355,257 A
• Filed: 11/19/1992
• Issued: 10/11/1994
• Est. Priority Date: 11/19/1991
• Status: Expired due to Fees

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Lokhoff, Gerardus C. P., Wirtz, Gijsbrecht C.
• Primary Examiner(s): Hajec, Donald
• Assistant Examiner(s): Kim, Won Tae C.
• Application Number:
  US07/978,101
• Time in Patent Office: 691 Days
• Field of Search: 360/6, 360/31, 360/82, 360/46, 360/54, 360/72.2, 360/74.1, 360/74.4, 360/69, 365/195, 365/196
• US Class Current: 360/32
• CPC Class Codes: G11B 11/10595 Control of operating function
• CPC Class Codes: G11B 15/02 Control of operating function, e.g. switching from recording to reproducing
• CPC Class Codes: G11B 15/087 by sensing recorded signals
• CPC Class Codes: G11B 19/04 Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
• CPC Class Codes: G11B 2220/90 Tape-like record carriers
• CPC Class Codes: G11B 23/0007 Circuits or methods for reducing noise, for correction of distortion, or for changing density of recorded information, volume compression or expansion circuits per se H03G7/00
• CPC Class Codes: G11B 27/36 Monitoring, i.e. supervising the progress of recording or reproducing for digital recording G11B20/00 and s.gr.; for monitoring, testing or measuring of TV recorders of the type covered by H04N5/76 and subgroups, see H04N17/06
• CPC Class Codes: G11B 5/00813 magnetic tapes

Abstract

An arrangement (60) for recording an analog signal in a track on a record carrier (82) is provided with an overload detection circuit (78) for detection an overload situation for the analog signal applied to the arrangement. Upon detection of an overload situation, the recording mode is terminated and the record carrier is rewound to the start location of the current recording. Further, the arrangement is provided with a variable attenuator means (66). The attenuation factor in the variable attenuator is increased upon detection of the overload situation.

Claims

1. An arrangement for storing an analog signal in storage means in a storing mode, comprising:

an input terminal for receiving the analog signal;

variable attenuator means having an input coupled to the input terminal and an output;

conversion means, having an input coupled to the output of the variable attenuator means, and an output, the conversion means being adapted for converting the signal applied to its input into a second signal and for supplying the second signal to the output;

storing means, having an input coupled to the output of said conversion means, for storing said second signal in said storage means,

characterized in that said arrangement further comprises;

overload detection means having an input also coupled to the output of said conversion means, said overload detection means detecting an overload situation for the analog signal applied to the arrangement; and

attenuator control signal generator means having an input coupled to an output of said overload detection means for generating at an output an attenuator control signal upon said overload detection means detecting an overload situation, the output of said attenuator control signal generating means being coupled to a control signal input of the variable attenuator means, the arrangement being adapted to terminate the storing mode upon said overload detection means detecting the overload situation, and the variable attenuator means being adapted to increase the attenuation upon receipt of the attenuator control signal.

2. An arrangement for storing an analog signal in storage means in a storing mode as claimed in claim 1, wherein said storage means is in the form of a track on a record carrier, and the storing means comprises writing means, having an input coupled to the output of the conversion means, for writing the second signal in at least one track on the record carrier, the arrangement further comprising:

record carrier transport control means for generating a control signal at an output; and

record carrier transport means, having a control signal input coupled to the output of the record carrier transport control means, for realizing a first relative movement of the write means relative to the record carrier during the writing of the second signal in the track in said recording mode, in response to a first control signal generated by the record carrier transport control means, so as to enable the writing of the second signal in the track from a start location on said record carrier,

characterized in that the arrangement is adapted to terminate the recording mode upon said overload detection means detecting the overload situation, to terminate the first relative movement of the writing means relative to the record carrier, to switch over to a second relative movement of the writing means relative to the record carrier so as to position the write means at a location substantially corresponding to the start location of the recording of the second signal on the record carrier, and to stop the second relative movement at said location.

3. Arrangement as claimed in claim 2, in which the record carrier is in the form of a longitudinal record carrier, the record carrier transport means being adapted to transport the record carrier with a transport velocity in a first direction during the writing of the second signal in the track in said recording mode, in response to a first control signal generated by the record carrier transport control means, characterized in that the arrangement is adapted to terminate the recording mode upon detection of the overload situation, to terminate the transport of the record carrier in said first direction, to switch over to a rewind mode in which the record carrier is transported in a second direction which is opposite to said first direction, and to stop the transport of the record carrier in said second direction at the location substantially corresponding to the start location of the recording of the second signal on the record carrier.

4. Arrangement according to claim 2, characterized in that the arrangement further comprises means for generating and supplying a repeat control signal to a control signal output of said arrangement after said overload detection means detects the overload situation.

5. Arrangement according to claim 4, characterized in that, the arrangement is further adapted to subsequently switch over to a recording mode, so as to re-record the second signal.

6. Arrangement as claimed in claim 5, characterized in that position indicator generator means are provided for generating at an output a position indicator upon the start of the recording of the second signal, the position indicator being an indication of the location of the start position of the recording of the second signal on the record carrier, the output being coupled to an input of a storage means, the storage means being further adapted to store the position indicator, and that the arrangement is adapted to stop the second relative movement at a location substantially corresponding to the position indicator lastly stored.

7. Arrangement according to claim 6, characterized in that the position indicator generator means are adapted to generate a start marker at its output upon the start of the recording of the second signal, the storage means comprising the write means, the output of the position indicator generator means being coupled to the input of the write means, the write means being further adapted to write the start marker on the record carrier substantially at the moment of occurrence of the start marker, the arrangement further comprising:

start marker detector means, for detecting a start marker recorded on the record carrier, during reproduction from the record carrier, the arrangement being adapted to switch over to a start marker detection mode during the second relative movement, and to stop said second relative movement upon detection of a first start marker detected in the start marker detection mode.

8. Arrangement as claimed in claim 7, characterized in that the record carrier transport control means is adapted to generate a second control signal upon the detection of the overload situation, the record carrier transport means being adapted to switch over to the second relative movement upon receipt of said second control signal.

9. Arrangement as claimed in claim 8, characterized in that, the record carrier transport means is further adapted to stop said second relative movement upon the detection of the first start marker detected in the start marker detection mode.

10. Arrangement as claimed in claim 7, characterized in that the record carrier transport means being further adapted to restart said first relative movement, so as to enable the re-recording of the second signal.

11. Combination of an analog signal generator means and the arrangement as claimed in claim 4, the analog signal generator means comprising a signal output for supplying an analog signal, for recording on a record carrier by means of the arrangement, the signal generator means further comprising a control signal input for receiving a repeat control signal the signal generator means being adapted to stop the supply of the analog signal and to restart the generation of the analog signal from the beginning, upon the receipt of the repeat control signal, characterized in that, the signal output of the analog signal generator means is coupled to the input terminal of the arrangement, and the control signal output of the arrangement is coupled to the control signal input of the analog signal generator means.

12. Arrangement as claimed in claim 2, for recording the analog signal in a digital form in the track on the record carrier in the recording mode, the arrangement further comprising:

an A/D converter, having an input coupled to the output of the variable attenuator means, and an output, for converting the analog input signal into a first digital signal, the conversion means having its input coupled to the output of the A/D converter and being adapted for convening the first digital signal applied to its input into a second digital signal and for supplying the second digital signal to the output, and the writing means being adapted for writing the second digital signal in at least one track on the record carrier, characterized in that the overload detection means are adapted to detect a signal amplitude of maximal value in the output signal of the A/D converter, and to generate an overload detection/signal in response to the occurrence of a signal amplitude of maximal value during a certain time interval, so as to indicate the overload situation.

13. Arrangement as claimed in claim 2, characterized in that the overload detection means are adapted to detect a signal amplitude in the input signal to the arrangement which exceeds a threshold amplitude during a certain time interval, and to generate an overload detection signal in response thereto, so as to indicate the overload situation.

14. An arrangement for storing an analog signal in storage means in a storing mode as claimed in claim 1, wherein said storage means is in the form of a digital memory, and the conversion means comprises an A/D converter for converting the analog signal into a digital signal, the arrangement further comprising:

address generating control means for generating a control signal at an output; and

address generating means, having a control signal input coupled to the output of said address generating control means, for generating subsequent addresses at an output during the storing of the digital signal in said digital memory, in response to a first control signal generating by the address generating control means, said storing means having an address input coupled to the output of the address generating means for storing the digital signal in said digital memory at locations in the digital memory corresponding to the subsequent addresses generated by the address generating means.

15. Arrangement as claimed in claim 14, characterized in that the arrangement further comprises means for generating and supplying a repeat control signal to a control signal output of said arrangement after said overload detection means detects the overload situation.

16. Arrangement according to claim 15, characterized in that, the arrangement is further adapted to subsequently switch over to a second storing mode, so as to repeat the storing of the digital signal.