JPH0229596Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a song erasing device for erasing a predetermined song on a magnetic tape in a magnetic recording/reproducing machine.

Conventionally, on recorded tapes where multiple songs have been recorded with unrecorded sections inserted between them, unnecessary songs can be erased and new songs can be recorded. If you want to correct the problem, store the end of the unnecessary song in memory based on the contents of the tape counter, then rewind and start erasing from the beginning of the song. When the contents of the tape counter match the contents of the memory, erase will begin. A complicated operation was required to terminate the process.

This invention was made in view of the above points,
The object is to provide a song erasing device for a magnetic recording/playback machine that allows any of a plurality of songs on a recorded tape to be easily erased.

The present invention will be described below with reference to illustrated embodiments.

The figure shows an example in which a microcomputer is used as a control circuit 1 for controlling various types of a magnetic recording/reproducing machine. Command signals such as recording, playback, fast forwarding, rewinding, and stopping can be applied to the control circuit 1 by an operation means (not shown), as in a general magnetic recording/playback machine. When the circuit 1 receives these signals, it sends out command signals such as recording a, playback b, fast forward c, rewind d, and stop e to control the mechanism section 2 in a state corresponding to the signals.

The control circuit 1 further includes a tape position signal f from a tape counter 4 that counts the amount of tape travel based on a detection signal from a reel table rotation detection mechanism 3, and a tape position signal f from a tape counter 4 that counts the amount of tape travel based on a detection signal from a reel table rotation detection mechanism 3, and a tape position signal f from a tape counter 4 that counts the distance between songs based on a playback signal g. In addition to inputting an inter-song signal h from an inter-song detecting circuit 5 that detects an unrecorded portion between songs, a song number designation signal i, an inter-song storage command signal j, and an automatic erase signal are inputted by an external operation. A command signal k is also input. Note that 6 is a bias oscillator that operates in response to the recording command signal a and sends out a bias signal to the erasing head 7, and 8 is a tape counter 4.
This is a display device that digitally displays, for example, the contents.

As described above, the control circuit 1 outputs the inter-music storage command signal j
When input, a reproduction command signal a and a fast-forward command signal c are sent to the mechanism section 2, and the tape is played back in fast-forward from its starting end.
As a result, the reel stand (not shown) begins to rotate, and the tape counter 4 counts the pulses from the reel stand rotation detection mechanism 3 and sequentially inputs the counted contents to the control circuit 1 as a tape position signal f. Also, the song interval detection circuit 5 detects a song interval based on the playback signal g applied to its input, and inputs the song interval signal h to the control circuit 1 each time.

As described above, when the inter-track signal h is input while the tape position signal f is input, the control circuit 1 sequentially stores tape position information based on the tape position signal f in a predetermined position of the memory. do.

When the tape has been played to the end as described above and the tape position information for all the inter-tracks within the tape has been stored in the memory, the track number designation signal i that specifies the track number of the track to be erased is externally operated. is input to the control circuit 1, and the control circuit 1 responds to this song number designation signal i to determine the correspondence between the beginning and end of the song with the specified song number among the stored tape position information. Read what you want to do from memory. Thereafter, when an automatic erasure command signal k is externally inputted to the control circuit 1 in order to erase the song with the specified song number, the control circuit 1 sends a rewind signal d to its output to cause the mechanism section 2 to rewind. state.

When the reel stand is rotated in the opposite direction due to the above-mentioned rewinding,
The tape counter 4 sequentially counts down the pulses from the reel table rotation detection mechanism 3.
Then, when the count content of the tape counter 4 matches the tape position information about the interval at the beginning of the song of the designated song number read above, the control circuit 1
In response, the recording signal a is sent out to put the mechanism section 2 into the recording state, and the bias oscillation circuit 6 is operated to cause the erasing head 7 to start erasing the song.

In the process of performing the tape erasing operation in this way, when the contents of the tape counter 4 come to match the tape position information about the end of the song with the specified song number read above, the control circuit 1 A stop command signal e is sent to stop the operation of the mechanism section 2, and the operation of the bias oscillation circuit 6 is also stopped.

FIG. 2 is a block diagram showing more details of the control circuit 1. In the figure, 1a is a memory for storing tape position, in which, in addition to a tape position signal f and an inter-track signal h, a track number designation signal i and an inter-track storage command are stored. A signal j is input, and in response to the input of the inter-song storage command signal j, tape position information is sequentially stored based on the tape position signal f at that time every time the inter-song signal h is input, In addition, in response to the input of the song number designation signal i, tape position information regarding the interval before and after the song of the specified song number is output.

Reference numeral 1b denotes a comparator circuit, which is configured to receive an automatic erase command signal k in addition to the tape position signal f and the output signal of the memory 1a, and a track number designation signal i as described above is input to the memory 1a. When an automatic erasure command signal k is input while a signal regarding tape position information is being input from the memory 1a, a signal regarding the interval before and after the song from the memory 1a and a current tape position signal f are input. A recording control signal and a stop control signal are respectively outputted according to a match between the two, and these signals are applied to the drive circuit 1c. The drive circuit 1c receiving these signals sends a recording command signal a and a stop command signal b to the mechanism section 2, respectively.

In the above example, the erasing operation of the song is started from the beginning of the song, but it is not necessary to do so. The erasing operation may be terminated at a portion. It goes without saying that this erasing operation can be performed either by running the tape at a constant speed or by running it at a high speed.

As mentioned above, since the present invention stores the inter-track position information in advance, by simply specifying the track number of the song to be erased later, the beginning and end of the section to be erased on the tape can be stored as described above. Since the erasing operation is determined based on the inter-track position information, the start and end of the erasing operation can be performed automatically, resulting in an extremely excellent effect of improving operability.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of a music erasing device according to the present invention, and FIG. 2 is a more detailed block diagram of a part of FIG. 1. DESCRIPTION OF SYMBOLS 1... Control circuit, 2... Mechanical section, 4... Track interval detection circuit, 5... Tape counter, 6... Bias oscillator, 7... Erase head.

Claims (1)

[Scope of utility model registration request] means for transmitting a tape position signal for a running magnetic tape; means for transmitting an inter-track signal for a magnetic tape running in a reproduction state; and means for transmitting a tape position signal for a running magnetic tape; means for storing tape position information about the time;
means for specifying the number of the song to be erased; and means for specifying the song number of the song to be erased; What is claimed is: 1. A song erasing device for a magnetic recording/playback machine, characterized in that the song erasing device comprises means for erasing a song.