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US 4,375,092 AGranted
Automatic music selecting device
AssigneePioneer Electronic Corporation
InventorJunichi Yoshio
Life of this patent
Estimating the term…
Abstract
An automatic music selecting device in which a pickup cartridge is accurately lowered onto a disc at an intermediate position between adjacent songs on the disc even if the disc is eccentric. An intersong sensor mounted on the pickup cartridge detects the intersong intervals upon movement of the arm. The arm is stopped at a predetermined interval designated by an externally supplied song number. To do this, the output signal from the intersong sensor is held corresponding to the position just before the arm is stopped. Then, the position of the arm is finely adjusted on the basis of the difference between the level of the output signal thereafter produced by the sensor and the held level.
Claims4
An automaic music selecting device comprising:
- an intersong sensor mounted on a pickup cartridge mounted on an arm for detecting intervals between adjacent songs on a recording disc upon movement of said arm;
- means responsive to a number on said recording disc of a song externally designated for stopping said arm at a predetermined interval between adjacent songs on said recording disc;
- means for holding the level of an output signal from said intersong sensor before said arm is stopped;
- and
- means for finely adjusting the position of said arm on the basis of a difference between a level of the output signal thereafter produced from said sensor and the held level from said level holding means for disposing said arm in a predetermined intermediate position on said recording disc corresponding to said held level.
2 more elements
An automatic music selecting device comprising:
- an intersong sensor mounted on a pickup cartridge mounted on an arm for detecting intervals between adjacent songs on a recording disc upon movement of said arm;
- a control unit for stopping said arm at a predetermined interval between adjacent songs on said recording disc, said control unit comprising a data buffer for storing a number of a selected song;
- a counter operating in response to said intersong sensor for counting intersong intervals;
- coincidence circuit means operating in response to said data buffer and said counter for producing a coincidence signal when a counted value of said counter coincides with a song number stored in said data buffer;
- and a flip-flop the operational state of which is controlled in accordance with said coincidence signal, first and second control signals being produced on non-inverted and inverted outputs of said flip-flip;
- an intersong servo unit, said intersong servo unit comprising a first buffer amplifier having an input coupled to receive an output from said intersong sensor;
- a first analog switch having a signal input coupled to an output of said first buffer amplifier and a control input coupled to receive said first control signal;
- a capacitor coupled between an output of said first analog switch and ground;
- a second analog switch having a signal input coupled to said output of said first analog switch and an output coupled to ground with a control input of said second analog switch being coupled to receive said first control signal;
- a second buffer amplifier having an input coupled to said output of said first analog switch, an operational amplifier having a non-inverting input coupled to said output of said first buffer amplifier and an inverting input coupled to an output of said second buffer amplifier;
- and a third analog switch having a signal input coupled to an output of said operational amplifier and a control input coupled to receive said second control signal;
- and
- an arm driving unit operating in response to an output signal produced at an output of said third analog switch of said intersong servo unit.
10 more elements
An automatic music selecting device comprising:
- an intersong sensor mounted in the vicinity of a tip of a stylus of a pickup cartridge mounted on an arm for detecting predetermined intervals between adjacent songs on a recording disc upon movement of said arm;
- means responsive to a number of song on said recording disc externally designated for stopping said arm at a predetermined intermediate interval between adjacent songs on said recording disc;
- means responsive to an output signal level from said sensor for holding the level of an output signal from said intersong sensor before said arm is stopped;
- means for finely adjusting the position of said arm on said recording disc on the basis of a comparison result between the held level from said level holding means and the level of said output signal thereafter produced from said sensor;
- and
- means for shifting the level of either signal compared in said adjusting means.
3 more elements
An automatic music selecting device comprising:
- an intersong sensor mounted on a pickup cartridge mounted on an arm for detecting intervals between adjacent songs on a recording disc upon movement of said arm;
- a control unit for stopping said arm at a predetermined interval between adjacent songs on said recording disc, said control unit comprising a data buffer for storing a number of a selected song;
- a counter operating in response to said intersong sensor for counting intersong intervals;
- coincidence circuit means operating in response to said data buffer and said counter for producing a coincidence signal when a counted value of said counter coincides with a song number stored in said data buffer;
- and a flip-flop the operational state of which is controlled in accordance with said coincidence signal, first and second control signals being produced on non-inverted and inverted outputs of said flip-flop;
- an intersong servo unit, said intersong servo unit comprising a first buffer amplifier having an input coupled to receive an output of said intersong sensor;
- a first analog switch having a signal input coupled to an output of said first buffer amplifier and a signal input coupled to receive said first signal;
- a capacitor coupled between an output of said first analog switch and ground;
- a second analog switch having a signal input coupled to said output of said first analog switch and an output coupled to ground with a control input coupled to receive said first control signal;
- a second buffer amplifier having an input coupled to said output of said first analog switch;
- a first operational amplifier having an inverting input coupled to said output of said first buffer amplifier;
- a variable resistor having end contacts coupled to respective positive and negative voltage sources and a wiper contact coupled to a non-inverting input of said first differential amplifier;
- a second differential amplifier having a non-inverting input coupled to an output of said first operational amplifier and an inverting input coupled to an output of said second buffer amplifier;
- and a third analog switch having a signal input coupled to an output of said second operational amplifier and a control input coupled to receive said second control signal.
11 more elements
Dependencies are inferred from the claim text.