Automatic recording current controller of magnetic recorder

An automatic recording current controller of a magnetic recorder which comprises first and second recording heads and is capable of double magnetic recording in which a first signal is recorded in a deep portion of a magnetic recording medium through said first recording head and then a second signal is recorded in a surface portion of said magnetic recording medium through said second magnetic head, said automatic recording current controller comprising:

• recording level changing means for changing a recording level when said second signal is recorded through said second recording head;
• first signal amount detection means for detecting an amount of said first signal recorded in said deep portion of said magnetic recording medium;
• second signal amount detection means for detecting an amount of said second signal recorded in said surface portion of said magnetic recording medium;
• means for storing a preset reference value;
• first recording level detection means for detecting a first recording level of said second signal when said first signal amount detected by said first signal amount detection means becomes equal to or greater than said preset reference value;
• second recording level detection means for detecting a second recording level of said second signal when said second signal amount detected by said second signal amount detection means reaches a maximum level;
• third recording level detection means for detecting a third recording level of said second signal when said second signal amount detected by said second signal amount detection means becomes a predetermined amount, said third recording level being smaller than said second recording level;
• optimum recording level arithmetic means for assigning priorities to said first to third recording levels detected by said first to third recording level detection means, for weighting and finding an optimum recording level of said second signal by calculation;
• and
• optimum recording level storage means for storing said optimum recording level found by said arithmetic means,
• wherein a recording current of said second recording head is controlled based on said optimum recording level stored in said storage means.

An automatic recording current controller of a magnetic recorder which comprises first and second recording heads and is capable of double magnetic recording in which a first signal is recorded in a deep portion of a magnetic recording medium through said first recording head and then a second signal is recorded in a surface portion of said magnetic recording medium through said second magnetic head, said automatic recording current controller comprising:

• recording level changing means for changing a recording level when said second signal is recorded through said second recording head;
• first signal amount detection means for detecting an amount of said first signal recorded in said deep portion of said magnetic recording medium;
• second signal amount detection means for detecting an amount of said second signal recorded in said surface portion of said magnetic recording medium;
• means for storing a first preset value;
• first recording level detection means for detecting a first recording level of said second signal when said first signal amount detected by said first signal amount detection means becomes equal to or greater than said first preset value;
• second recording level detection means for detecting a second recording level of said second signal when said second signal amount detected by said second signal amount detection means reaches a maximum level;
• third recording level detection means for detecting a third recording level of said second signal when said second signal amount detected by said second signal amount detection means decreases by a predetermined level from said maximum level, said third recording level being smaller than said second recording level;
• fourth recording level detection means for detecting a fourth recording level of said second signal when said first signal amount detected by said first signal amount detection means becomes equal to or greater than a second value less than said first value;
• optimum recording level arithmetic means for assigning priorities to said first to fourth recording levels detected by said recording level detection means for weighting and finding an optimum recording level of said second signal by calculation;
• and
• optimum recording level storage means for storing said optimum recording level found by said arithmetic means, wherein
• recording current of said second recording head is controlled based on said optimum recording level stored in said storage means.

An automatic recording current controller of a magnetic recorder which comprises first and second recording heads and is capable of double magnetic recording in which a first signal is recorded in a deep portion of a magnetic recording medium through said first recording head and then a second signal is recorded in a surface portion of said magnetic recording medium through said second magnetic head, said automatic recording current controller comprising:

• recording level changing means for changing a recording level when said second signal is recorded through said second recording head;
• first signal amount detection means for detecting an amount of said first signal recorded in said deep portion of said magnetic recording medium;
• second signal amount detection means for detecting an amount of said second signal recorded in said surface portion of said magnetic recording medium;
• means for storing a first preset value;
• first recording level detection means for detecting a first recording level of said second signal when said first signal amount detected by said first signal amount detection means becomes equal to or greater than said first preset value;
• second recording level detection means for detecting a second recording level of said second signal when said second signal amount detected by said second signal amount detection means reaches a maximum level;
• third recording level detection means for detecting a third recording level of said second signal when said second signal amount detected by said second signal amount detection means becomes a predetermined amount, said third level being smaller than said second recording level;
• fourth recording level detection means for detecting a fourth recording level of said second signal when said first signal amount detected by said first signal amount detection means becomes equal to or greater than a second value less than said first value;
• optimum recording level arithmetic means for assigning priorities to said first to fourth recording levels detected by said recording level detection means for weighting and finding an optimum recording level of said second signal by calculation;
• and
• optimum recording level storage means for storing said optimum recording level found by said arithmetic means, wherein
• recording current of said second recording head is controlled based on said optimum recording level stored in said storage means.

An automatic recording current controller of a magnetic recorder which comprises first and second recording heads and is capable of double magnetic recording in which a first signal is recorded in a deep portion of a magnetic recording medium through said first recording head and then a second signal is recorded in a surface portion of said magnetic recording medium through said second magnetic head, said automatic recording current controller comprising:

• recording level changing means for changing a recording level when said second signal is recorded through said second recording head;
• first signal amount detection means for detecting an amount of said first signal recorded in said deep portion of said magnetic recording medium;
• second signal amount detection means for detecting an amount of said second signal recorded in said surface portion of said magnetic recording medium;
• means for storing a preset reference value;
• first recording level detection means for detecting a first recording level of said second signal when said first signal amount detected by said first signal amount detection means becomes equal to or greater than said preset reference value;
• second recording level detection means for detecting a second recording level of said second signal when said second signal amount detected by said second signal amount detection means reaches a maximum level;
• third recording level detection means for detecting a third recording level of said second signal when said second signal amount detected by said second signal amount detection means decreases by a predetermined level from said maximum level, said third recording level being smaller than said second recording level;
• optimum recording level arithmetic means for assigning priorities to said first to third recording levels detected by said first to third recording level detection means, for weighting and finding an optimum recording level of said second signal by calculation;
• and
• optimum recording level storage means for storing said optimum recording level found by said arithmetic means, wherein a recording current of said second recording head is controlled based on said optimum recording level stored in said storage means,
• wherein said recording level changing means comprises means for changing a recording level step-wise when said second signal is recorded through said second recording head, said controller further comprising:
• control signal recording means for changing a duty ratio of a control signal and for recording said control signal on said magnetic recording medium in synchronization with changing said recording level by said recording level changing means;
• and
• means for reproducing said recorded control signal from said magnetic recording medium, detecting said duty ratio of said control signal, and using said duty ratio as an address of said recording level changed step-wise and recorded.

An automatic recording current controller of a magnetic recorder which comprises first and second recording heads and is capable of double magnetic recording in which a first signal is recorded in a deep portion of a magnetic recording medium through said first recording head and then a second signal is recorded in a surface portion of said magnetic recording medium through said second magnetic head, said automatic recording current controller comprising:

• recording level changing means for changing a recording level when said second signal is recorded through said second recording head;
• first signal amount detection means for detecting an amount of said first signal recorded in said deep portion of said magnetic recording medium;
• second signal amount detection means for detecting an amount of said second signal recorded in said surface portion of said magnetic recording medium;
• means for storing a preset reference value;
• first recording level detection means for detecting a first recording level of said second signal when said first signal amount detected by said first signal amount detection means becomes equal to or greater than said preset reference value;
• second recording level detection means for detecting a second recording level of said second signal when said second signal amount detected by said second signal amount detection means reaches a maximum level;
• third recording level detection means for detecting a third recording level of said second signal when said second signal amount detected by said second signal amount detection means decreases by a predetermined level from said maximum level, said third recording level being smaller than said second recording level;
• optimum recording level arithmetic means for assigning priorities to said first to third recording levels detected by said first to third recording level detection means, respectively, for weighting and finding an optimum recording level of said second signal by calculation;
• and
• optimum recording level storage means for storing said optimum recording level found by said arithmetic means,
• wherein a recording current of said second recording head is controlled based on said optimum recording level stored in said storage means,
• wherein said magnetic recorder comprises a helical scan magnetic recorder which comprises a first recording head group including at least two first recording heads and a second recording head group including at least two second recording heads and is capable of double magnetic recording in which a first signal is recorded in a deep portion of a magnetic recording medium through said first recording head group and then a second signal is recorded in a surface portion of said magnetic recording medium through said second magnetic head group, and wherein said recording level changing means comprises means for changing a recording level when said second signal is recorded through said second recording head group separately for each of said second recording heads in said second recording head group, said first to third recording level detections means comprise means for detecting said first to third recording levels of said second signal separately for each of said second recording heads, said optimum recording level arithmetic means comprises means for assigning priorities to said first to third recording levels detected separately for each of said second recording heads by said recording level detection means for weighting and finding said optimum recording level of said second signal separately for each of said second recording heads by calculation, and said optimum recording level storage means comprises means for storing said optimum recording level for each of said second recording heads found by said optimum recording level arithmetic means, whereby a recording current of each of said second recording heads in said second recording head group is controlled separately based on each optimum recording level stored in said storage means,
• wherein said recording level changing means comprises means for changing a recording level step-wise when said second signal is recorded through said second recording head, said controller further comprising:
• control signal recording means for changing a duty ratio of a control signal and for recording said control signal on said magnetic recording medium in synchronization with changing said recording level by said recording level changing means;
• and
• means for reproducing said recorded control signal from said magnetic recording medium, detecting said duty ratio of said control signal, and using said duty ratio as an address of said recording level changed step-wise and recorded.

An automatic recording current controller of a magnetic recorder which comprises first and second recording heads and is capable of double magnetic recording in which a first signal is recorded in a deep portion of a magnetic recording medium through said first recording head and then a second signal is recorded in a surface portion of said magnetic recording medium through said second magnetic head, said automatic recording current controller comprising:

• recording level changing means for changing a recording level when said second signal is recorded through said second recording head;
• first signal amount detection means for detecting an amount of said first signal recorded in said deep portion of said magnetic recording medium:
• second signal amount detection means for detecting an amount of said second signal recorded in said surface portion of said magnetic recording medium;
• means for storing a preset reference value;
• first recording level detection means for detecting a first recording level of said second signal when said first signal amount detected by said first signal amount detection means becomes equal to or greater than said preset reference value;
• second recording level detection means for detecting a second recording level of said second signal when said second signal amount detected by said second signal amount detection means reaches a maximum level;
• third recording level detection means for detecting a third recording level of said second signal when said second signal amount detected by said second signal amount detection means decreases by a predetermined level from said maximum level, said third recording level being smaller than said second recording level;
• optimum recording level arithmetic means for assigning priorities to said first to third recording levels detected by said first to third recording level detection means, for weighting and finding an optimum recording level of said second signal by calculation;
• and
• optimum recording level storage means for storing said optimum recording level found by said arithmetic means,
• wherein a recording current of said second recording head is controlled based on said optimum recording level stored in said storage means,
• wherein said first signal comprises a high-fidelity audio signal, said controller further comprising:
• means for reproducing and demodulating said high-fidelity audio signal recorded in said deep portion of said magnetic recording medium through said first recording head, determining a level of a noise component contained in said demodulated reproduced audio signal, and outputting a high-fidelity/linear switch control signal for switching an audio signal to be output between high-fidelity audio and linear audio;
• and
• reference value setting means for automatically setting said reference value based on said level of said reproduced audio signal just before said high-fidelity-to-linear transition of said high-fidelity/linear switch control signal is made by said reproducing and demodulating means.

An automatic recording current controller of a magnetic recorder which comprises first and second recording heads and is capable of double magnetic recording in which a first signal is recorded in a deep portion of a magnetic recording medium through said first recording head and then a second signal is recorded in a surface portion of said magnetic recording medium through said second magnetic head, said automatic recording current controller comprising:

• recording level changing means for changing a recording level when said second signal is recorded through said second recording head;
• first signal amount detection means for detecting an amount of said first signal recorded in said deep portion of said magnetic recording medium;
• second signal amount detection means for detecting an amount of said second signal recorded in said surface portion of said magnetic recording medium;
• means for storing a preset reference value;
• first recording level detection means for detecting a first recording level of said second signal when said first signal amount detected by said first signal amount detection means becomes equal to or greater than said preset reference value;
• second recording level detection means for detecting a second recording level of said second signal when said second signal amount detected by said second signal amount detection means reaches a maximum level;
• third recording level detection means for detecting a third recording level of said second signal when said second signal amount detected by said second signal amount detection means decreases by a predetermined level from said maximum level, said third recording level being smaller than said second recording level;
• optimum recording level arithmetic means for assigning priorities to said first to third recording levels detected by said first to third recording level detection means, for weighting and finding an optimum recording level of said second signal by calculation;
• and
• optimum recording level storage means for storing said optimum recording level found by said arithmetic means,
• wherein a recording current of said second recording head is controlled based on said optimum recording level stored in said storage means,
• wherein said magnetic recorder comprises a helical scan magnetic recorder which comprises a first recording head group including at least two first recording heads and a second recording head group including at least two second recording heads and is capable of double magnetic recording in which a first signal is recorded in a deep portion of a magnetic recording medium through said first recording head group and then a second signal is recorded in a surface portion of said magnetic recording medium through said second magnetic head group, and wherein said recording level changing means comprises means for changing a recording level when said second signal is recorded through said second recording head group separately for each of said second recording heads in said second recording head group, said first to third recording level detections means comprise means for detecting said first to third recording levels of said second signal separately for each of said second recording heads, said optimum recording level arithmetic means comprises means for assigning priorities to said first to third recording levels detected separately for each of said second recording heads by said recording level detection means for weighting and finding said optimum recording level of said second signal separately for each of said second recording heads by calculation, and said optimum recording level storage means comprises means for storing said optimum recording level for each of said second recording heads found by said optimum recording level arithmetic means, whereby a recording current of each of said second recording heads in said second recording head group is controlled separately based on each optimum recording level stored in said storage means,
• wherein said first signal comprises a high-fidelity audio signal, said controller further comprising:
• means for reproducing and demodulating said high-fidelity audio signal recorded in said deep portion of said magnetic recording medium through said first recording head, determining a level of a noise component contained in said demodulated reproduced audio signal, and outputting a high-fidelity/linear switch control signal for switching an audio signal to be output between high-fidelity audio and linear audio;
• and
• reference value setting means for automatically setting said reference value based on said level of said reproduced audio signal just before said high-fidelity-to-linear transition of said high-fidelity/linear switch control signal is made by said reproducing and demodulating means.

An automatic recording current controller of a magnetic recorder which comprises first and second recording heads and is capable of double magnetic recording in which a first signal is recorded in a deep portion of a magnetic recording medium through said first recording head and then a second signal is recorded in a surface portion of said magnetic recording medium through said second magnetic head, said automatic recording current controller comprising:

• recording level changing means for changing a recording level when said second signal is recorded through said second recording head;
• first signal amount detection means for detecting an amount of said first signal recorded in said deep portion of said magnetic recording medium;
• second signal amount detection means for detecting an amount of said second signal recorded in said surface portion of said magnetic recording medium;
• means for storing a preset reference value;
• first recording level detection means for detecting a first recording level of said second signal when said first signal amount detected by said first signal amount detection means becomes equal to or greater than said preset reference value;
• second recording level detection means for detecting a second recording level of said second signal when said second signal amount detected by said second signal amount detection means reaches a maximum level;
• third recording level detection means for detecting a third recording level of said second signal when said second signal amount detected by said second signal amount detection means becomes a predetermined amount, said third recording level being smaller than said second recording level;
• optimum recording level arithmetic means for assigning priorities to said first to third recording levels detected by said first to third recording level detection means, for weighting and finding an optimum recording level of said second signal by calculation;
• and
• optimum recording level storage means for storing said optimum recording level found by said arithmetic means,
• wherein a recording current of said second recording head is controlled based on said optimum recording level stored in said storage means,
• wherein said recording level changing means comprises means for changing a recording level step-wise when said second signal is recorded through said second recording head, said controller further comprising:
• control signal recording means for changing a duty ratio of a control signal and for recording said control signal on said magnetic recording medium in synchronization with changing said recording level by said recording level changing means;
• and
• means for reproducing said recorded control signal from said magnetic recording medium, detecting said duty ratio of said control signal, and using said duty ratio as an address of said recording level changed step-wise and recorded.

An automatic recording current controller of a magnetic recorder which comprises first and second recording heads and is capable of double magnetic recording in which a first signal is recorded in a deep portion of a magnetic recording medium through said first recording head and then a second signal is recorded in a surface portion of said magnetic recording medium through said second magnetic head, said automatic recording current controller comprising:

• recording level changing means for changing a recording level when said second signal is recorded through said second recording head;
• first signal amount detection means for detecting an amount of said first signal recorded in said deep portion of said magnetic recording medium;
• second signal amount detection means for detecting an amount of said second signal recorded in said surface portion of said magnetic recording medium;
• means for storing a preset reference value;
• first recording level detection means for detecting a first recording level of said second signal when said first signal amount detected by said first signal amount detection means becomes equal to or greater than said preset reference value;
• second recording level detection means for detecting a second recording level of said second signal when said second signal amount detected by said second signal amount detection means reaches a maximum level;
• third recording level detection means for detecting a third recording level of said second signal when said second signal amount detected by said second signal amount detection means becomes a predetermined amount, said third recording level being smaller than said second recording level;
• optimum recording level arithmetic means for assigning priorities to said first to third recording levels detected by said first to third recording level detection means, for weighting and finding an optimum recording level of said second signal by calculation;
• and
• optimum recording level storage means for storing said optimum recording level found by said arithmetic means,
• wherein a recording current of said second recording head is controlled based on said optimum recording level stored in said storage means,
• wherein said magnetic recorder comprises a helical scan magnetic recorder which comprises a first recording head group including at least two first recording heads and a second recording head group including at least two second recording heads and is capable of double magnetic recording in which a first signal is recorded in a deep portion of a magnetic recording medium through said first recording head group and then a second signal is recorded in a surface portion of said magnetic recording medium through said second magnetic head group, and
• wherein said recording level changing means comprises means for changing a recording level when said second signal is recorded through said second recording head group separately for each of said second recording heads in said second recording head group, said first to third recording level detection means comprise means for detecting said first to third recording levels of said second signal separately for each of said second recording heads, said optimum recording level arithmetic means comprises means for assigning priorities to said first to third recording levels detected separately for each of said second recording heads by said recording level detection means for weighting and finding said optimum recording level of said second signal separately for each of said second recording heads by calculation, and said optimum recording level storage means comprises means for storing said optimum recording level for each of said second recording heads found by said optimum recording level arithmetic means, whereby a recording current of each of said second recording heads in said second recording head group is controlled separately based on each optimum recording level stored in said storage means,
• wherein said recording level changing means comprises means for changing a recording level step-wise when said second signal is recorded through said second recording head, said controller further comprising:
• control signal recording means for changing a duty ratio of a control signal and for recording said control signal on said magnetic recording medium in synchronization with changing said recording level by said recording level changing means;
• and
• means for reproducing said recorded control signal from said magnetic recording medium, detecting said duty ratio of said control signal, and using said duty ratio as an address of said recording level changed step-wise and recorded.

An automatic recording current controller of a magnetic recorder which comprises first and second recording heads and is capable of double magnetic recording in which a first signal is recorded in a deep portion of a magnetic recording medium through said first recording head and then a second signal is recorded in a surface portion of said magnetic recording medium through said second magnetic head, said automatic recording current controller comprising:

• recording level changing means for changing a recording level when said second signal is recorded through said second recording head;
• first signal amount detection means for detecting an amount of said first signal recorded in said deep portion of said magnetic recording medium;
• second signal amount detection means for detecting an amount of said second signal recorded in said surface portion of said magnetic recording medium;
• means for storing a preset reference value;
• first recording level detection means for detecting a first recording level of said second signal when said first signal amount detected by said first signal amount detection means becomes equal to or greater than said preset reference value;
• second recording level detection means for detecting a second recording level of said second signal when said second signal amount detected by said second signal amount detection means reaches a maximum level;
• third recording level detection means for detecting a third recording level of said second signal when said second signal amount detected by said second signal amount detection means becomes a predetermined amount, said third recording level being smaller than said second recording level;
• optimum recording level arithmetic means for assigning priorities to said first to third recording levels detected by said first to third recording level detection means, for weighting and finding an optimum recording level of said second signal by calculation;
• and
• optimum recording level storage means for storing said optimum recording level found by said arithmetic means,
• wherein a recording current of said second recording head is controlled based on said optimum recording level stored in said storage means,
• wherein said first signal comprises a high-fidelity audio signal, said controller further comprising:
• means for reproducing and demodulating said high-fidelity audio signal recorded in said deep portion of said magnetic recording medium through said first recording head, determining a level of a noise component contained in said demodulated reproduced audio signal, and outputting a high-fidelity/linear switch control signal for switching an audio signal to be output between high-fidelity audio and linear audio;
• and
• reference value setting means for automatically setting said reference value based on said level of said reproduced audio signal just before said high-fidelity-to-linear transition of said high-fidelity/linear switch control signal is made by said reproducing and demodulating means.

An automatic recording current controller of a magnetic recorder which comprises first and second recording heads and is capable of double magnetic recording in which a first signal is recorded in a deep portion of a magnetic recording medium through said first recording head and then a second signal is recorded in a surface portion of said magnetic recording medium through said second magnetic head, said automatic recording current controller comprising:

• recording level changing means for changing a recording level when said second signal is recorded through said second recording head;
• first signal amount detection means for detecting an amount of said first signal recorded in said deep portion of said magnetic recording medium;
• second signal amount detection means for detecting an amount of said second signal recorded in said surface portion of said magnetic recording medium;
• means for storing a preset reference value;
• first recording level detection means for detecting a first recording level of said second signal when said first signal amount detected by said first signal amount detection means becomes equal to or greater than said preset reference value;
• second recording level detection means for detecting a second recording level of said second signal when said second signal amount detected by said second signal amount detection means reaches a maximum level;
• third recording level detection means for detecting a third recording level of said second signal when said second signal amount detected by said second signal amount detection means becomes a predetermined amount, said third recording level being smaller than said second recording level;
• optimum recording level arithmetic means for assigning priorities to said first to third recording levels detected by said first to third recording level detection means, for weighting and finding an optimum recording level of said second signal by calculation;
• and
• optimum recording level storage means for storing said optimum recording level found by said arithmetic means,
• wherein a recording current of said second recording head is controlled based on said optimum recording level stored in said storage means,
• wherein said magnetic recorder comprises a helical scan magnetic recorder which comprises a first recording head group including at least two first recording heads and a second recording head group including at least two second recording heads and is capable of double magnetic recording in which a first signal is recorded in a deep portion of a magnetic recording medium through said first recording head group and then a second signal is recorded in a surface portion of said magnetic recording medium through said second magnetic head group, and
• wherein said recording level changing means comprises means for changing a recording level when said second signal is recorded through said second recording head group separately for each of said second recording heads in said second recording head group, said first to third recording level detection means comprise means for detecting said first to third recording levels of said second signal separately for each of said second recording heads, said optimum recording level arithmetic means comprises means for assigning priorities to said first to third recording levels detected separately for each of said second recording heads by said recording level detection means for weighting and finding said optimum recording level of said second signal separately for each of said second recording heads by calculation, and said optimum recording level storage means comprises means for storing said optimum recording level for each of said second recording heads found by said optimum recording level arithmetic means, whereby a recording current of each of said second recording heads in said second recording head group is controlled separately based on each optimum recording level stored in said storage means,
• wherein said first signal comprises a high-fidelity audio signal, said controller further comprising:
• means for reproducing and demodulating said high-fidelity audio signal recorded in said deep portion of said magnetic recording medium through said first recording head, determining a level of a noise component contained in said demodulated reproduced audio signal, and outputting a high-fidelity/linear switch control signal for switching an audio signal to be output between high-fidelity audio and linear audio;
• and
• reference value setting means for automatically setting said reference value based on said level of said reproduced audio signal just before said high-fidelity-to-linear transition of said high-fidelity/linear switch control signal is made by said reproducing and demodulating means.