1. An audio signal separation apparatus for separating observation signals in a time domain of a mixture of a plurality of signals including audio signals into individual signals by means of independent component analysis to produce isolated signals, the apparatus comprising:
first conversion means for converting the observation signals in the time domain into observation signals in a time-frequency domain;
separation means for producing isolated signals in a time-frequency domain from the observation signals in the time-frequency domain; and
second conversion means for converting the isolated signals in the time-frequency domain into isolated signals in a time domain;
the separation means being adapted to produce isolated signals in a time-frequency domain from the observation signals in the time-frequency domain and a separation matrix substituted by initial values, compute the modified value of the separation matrix by using a score function using the isolated signals in the time-frequency domain and a multidimensional probability density function and the separation matrix, modify the separation matrix until the separation matrix substantially converges by using the modified value and produce isolated signals in the time-frequency domain by using the substantially converging separation matrix.
2. The apparatus according to claim 1, wherein
the isolated signals in the time-frequency domain are complex signals, and
a score function adapted to compute the phase component of a return value from a single argument and the absolute value of the return value from one or more than one arguments is used as the score function.
3. The apparatus according to claim 1, wherein the score function is such that the return value thereof represents a non-dimensional quantity and the phase of the return value depends solely on a single argument.
4. An audio signal separation method of separating observation signals in a time domain of a mixture of a plurality of signals including audio signals into individual signals by means of independent component analysis to produce isolated signals, the method comprising:
a step of converting the observation signals in the time domain into observation signals in a time-frequency domain;
a step of producing isolated signals in a time-frequency domain from the observation signals in the time-frequency domain and a separation matrix substituted by initial values;
a step of computing the modified value of the separation matrix by using a score function using the isolated signals in the time-frequency domain and a multidimensional probability density function and the separation matrix;
a step of modifying the separation matrix until the separation matrix substantially converges by using the modified value; and
a step of converting the isolated signals in the time-frequency domain produced by using the substantially converging separation matrix into isolated signals in a time domain.
5. The method according to claim 4, wherein
the isolated signals in the time-frequency domain are complex signals, and
a score function adapted to compute the phase component of a return value from a single argument and the absolute value of the return value from one or more than one arguments is used as the score function.
6. The method according to claim 4, wherein the score function is such that the return value thereof represents a non-dimensional quantity and the phase of the return value depends solely on a single argument.
7. An audio signal separation apparatus for separating observation signals in a time domain of a mixture of a plurality of signals including audio signals into individual signals by means of independent component analysis to produce isolated signals, the apparatus comprising:
a first conversion section that converts the observation signals in the time domain into observation signals in a time-frequency domain,
a separation section that produces isolated signals in a time-frequency domain from the observation signals in the time-frequency domain, and
a second conversion section that converts the isolated signals in the time-frequency domain into isolated signals in a time domain,
the separation section being adapted to produce isolated signals in a time-frequency domain from the observation signals in the time-frequency domain and a separation matrix substituted by initial values, compute the modified value of the separation matrix by using a score function using the isolated signals in the time-frequency domain and a multidimensional probability density function and the separation matrix, modify the separation matrix until the separation matrix substantially converges by using the modified value and produce isolated signals in the time-frequency domain by using the substantially converging separation matrix.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of manufacturing a head gimbal assembly, comprising the steps of:
attaching a head gimbal assembly to a fixing jig, the head gimbal assembly being configured such that a magnetic head slider is fixed to gimbals of a suspension with an adhesive and an electric terminal of the magnetic head slider is connected to an electric line laminated on the gimbals with a solder fillet;
separating the magnetic head slider from the gimbals by applying force to the head slider in a direction of peeling off the head slider from the gimbals while heating the head slider with a heating member, and removing the head slider from joint by the solder fillet while leaving the solder fillet on the electric line;
removing the adhesive left on the gimbals of the suspension;
applying an adhesive to the gimbals;
fixing another magnetic head slider to the gimbals with the adhesive applied; and
joining the solder fillet to an electric terminal of the another magnetic head slider by heating the solder fillet left.
2. The method according to claim 1, wherein in the step of removing the magnetic head slider from the suspension, the solder fillet is not melted.
3. The method according to claim 1, wherein the solder fillet has a melting point higher than that of the adhesive used to fix the magnetic head slider.
4. The method according to claim 1, wherein the heating member heats a portion closer to a rear end than to a central portion of the magnetic head slider, the portion being located on the side opposite to the joint portion of the solder fillet.
5. The method according to claim 1, wherein the heating temperature of the heating member is about 200\xb0 C. and the heating time of the heating member is about four seconds.
6. The method according to claim 1, wherein the heating member is hot tweezers which heats the portion of the magnetic head slider by gripping both sides of the magnetic head slider.
7. The method according to claim 1, wherein a gap is provided to have a distance of about 5 to 15 \u03bcm between an electric terminal of another magnetic head slider fixed to the gimbals and the solder fillet left on the electric line.
8. The method according to claim 1, wherein the solder fillet left on the electric line is heated by laser beam irradiation.