Method and apparatus for identifying sound recordings
First Claim
1. Method for identifying a sound recording, recorded on at least one track of a recording medium such as a magnetic tape and consisting in associating a coded auxiliary signal with the sound information signal, wherein the auxiliary signal is introduced during an individual recording operation of the sound information signal on the final recording medium, from the readout of a master tape on which, both the sound information signal and an end-of-sequence signal inserted between two sequences of program of the sound information signal have been recorded beforehand, the auxiliary signal being constituted by a coded digital signal derived from a pilot frequency and incremented at each detection of an end-of-sequence signal when the master tape is read out, and in mixing the auxiliary signal with the sound information signal while recording the sound information signal on the final recording medium in such a way as to inscribe the auxiliary signal repeatedly throughout the whole recording, the coded digital auxiliary signal being derived from a pilot frequency F which corresponds to a basic frequency f situated in a range outside the spectrum of audible frequencies towards the ultrasounds multiplied by a factor equal to the ratio of the advancing speed of the individual medium of final recording during the individual recording operation, to the advance speed of the individual medium of final recording during normal readout thereof.
1 Assignment
0 Petitions
Accused Products
Abstract
In an installation comprising a master assembly for reading the sound information signals and the end-of-program sequence signals recorded on a master tape, and at least one slave assembly to record a second time the read out signals, the slave assembly comprises circuits for detecting and regenerating end-of-sequence signals, which circuits are connected to the output of the said recording amplifier, digital coding circuits by derivation from a pilot frequency for producing a coded auxiliary digital signal, means to modify the digital coding at each new detection of end-of-sequence signals and an adder circuit to add the coded auxiliary digital signal with the sound information signal before re-recording the latter.
86 Citations
18 Claims
- 1. Method for identifying a sound recording, recorded on at least one track of a recording medium such as a magnetic tape and consisting in associating a coded auxiliary signal with the sound information signal, wherein the auxiliary signal is introduced during an individual recording operation of the sound information signal on the final recording medium, from the readout of a master tape on which, both the sound information signal and an end-of-sequence signal inserted between two sequences of program of the sound information signal have been recorded beforehand, the auxiliary signal being constituted by a coded digital signal derived from a pilot frequency and incremented at each detection of an end-of-sequence signal when the master tape is read out, and in mixing the auxiliary signal with the sound information signal while recording the sound information signal on the final recording medium in such a way as to inscribe the auxiliary signal repeatedly throughout the whole recording, the coded digital auxiliary signal being derived from a pilot frequency F which corresponds to a basic frequency f situated in a range outside the spectrum of audible frequencies towards the ultrasounds multiplied by a factor equal to the ratio of the advancing speed of the individual medium of final recording during the individual recording operation, to the advance speed of the individual medium of final recording during normal readout thereof.
-
11. Installation for duplicating sound recordings made on at least one track of a recording medium such as a magnetic tape, of the type comprising a master assembly for reading the sound information signals and the end-of-program sequence signal recorded of a master tape, and at least one slave assembly to record on an individual medium of final recording the said sound information signals and end-of-sequence signals read out from the master tape;
- the said slave recording assembly comprising, associated to a recording equalizer circuit and to a recording amplifier circuit, at least one slave equalizer circuit, one polarizing oscillator and one premagnetizing power amplifier, installation wherein the said slave assembly comprises circuits for detecting a regenerating end-of-sequence signals, which circuits are connected to the output of the said recording amplifier, digital coding circuits by derivation from a pilot frequency for producing a coded auxiliary digital signal, means associated to the end-of-sequence signal regenerating circuit and connected to the digital coding circuits to modify the digital coding at each new detection of end-of-sequence signals and an adder circuit to add the coded auxiliary digital signal with the sound information signal and upstream of the slave recording head on the final recording individual medium.
- View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
Specification