JPS5939351Y2 - code reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder, and more particularly to a code reading device for reading a time code recorded on a tape recorder.

A known method for synchronizing a video tape recorder (hereinafter referred to as VTR) and an audio tape recorder (hereinafter referred to as ATR) in terms of absolute time is to use a time code.
MPTE (SOCIFTYOF MOTION PI)
CTTJRE AND EVISION ENGINE
ER8) standard.

This method is generally used for electronic editing of VTRs, etc.

As shown in Figure 3, this time code has 30 frames per second, and one frame is represented by a pulse of 80 pits, and can represent up to 99 hours, 59 minutes, 59 seconds, and 29 frames. 32 bits are time code A and 32 bits are free bits B for the user.
16 bits are used as a link word C, and each bit is 4 bits to indicate the hour, minute, second, and number of the frame.
It is divided into two bits, and between each bit there is a user bit B.
The 16-bit link word C can be used to identify whether the tape is running in the forward direction or in the reverse direction, and the code signal is set so that the information in IllrOJ is reversely transferred. It is said to be a pi-phase signal expressed by a difference in phase.

If you record this kind of SMPTE code on the VTR and ATR, you can synchronize with this time code, so you can synchronize with frame precision and absolute time (address), so the ATR and VTR will be out of synchronization. Even if the ATR and VTR play on the father's side, the synchronizer is designed to automatically set the same time (address).

However, since the time code cannot be read when the tape is stopped, that is, when the tape is stopped, it is especially difficult to read the time code of the desired position of the program recorded on the ATR tape. It was inconvenient.

For example, as shown in FIG.
A program such as music is recorded on the second track 4.
Record the time code in b.

The part 4c inside the blind is a non-recording part to prevent Talostalk and the like.

The beginning part (head part) 4a' of the program can be found by the commonly used method, that is, by listening to the sound on a monitor.

For example, the tape 4 is hung on the ATR, and the output from the playback head is monitored as a playback state.

When the beginning part 4a is heard, the tape is immediately stopped and the supply reel and take-up reel are manually rewound while searching for the beginning part 4a'.However, since the tape stops at this time,
Time code cannot be read.

To read the time code during playback, etc., the playback head is made up of two track heads, so the program must be played on the upper trunk, the time code played on the lower track, and then read using a time code reader (not shown). will be accomplished.

The present invention aims to eliminate the above-mentioned drawbacks and provide a tape recorder capable of reading out the time code at the target position.

The present invention will be described in detail below with reference to FIGS. 1 and 2.

The tape recorder 1 includes tape guides 5, 6, 13, 14 and an erasing head 8 from a supply reel 2 to a take-up reel 3. Recording head9. A tape 4 is supplied through a group of heads such as a playback head 10, a pinch roller 12, and a capstan 11, and operations such as playback and recording are performed using operation buttons 7 arranged on the front surface of the tape recorder 1.

Reference numeral 15 denotes tape running measuring means, which is comprised of, for example, a timer, and is disposed on the top surface of the housing of the tape recorder.

Tape running measuring means 1 consisting of the above-mentioned tape timer etc.
5 has a rotating disk 13a attached to the shaft 13c of the tape guide 13, as shown in FIG. 16 and a light receiving element 17 are arranged, and when the tape guide 13 is rotated by the tape 4, the rotating disk 13a rotates and the number of rotations of the tape guide 13 is detected.

The number of rotations of the tape guide 13 is determined by counting the pulses from the light receiving element using the timer circuit 18 and displaying the information on the display device 15'.
Convert it to time and display it.

A clear signal is applied to the timer circuit 18 from the input line 20, and the output line 19 is configured so that the signal is taken out when the timer display becomes zero.

In the above-described configuration, the reels 2 and 3 are rotated by hand,
After finding the desired head position 4a' shown in FIG. 4, the tape timer is reset to zero.

After that, the tape is rewound for a few seconds and put into playback mode.

When the counter reaches zero, the value of the time code reader (not shown) is held by the output of the zero signal output line 19.

The value of this time code reader becomes the target position, that is, the head position in this embodiment.

In general, many professional tape recorders are equipped with a tape timer, and in the embodiment, an example was explained in which a timing pulse is issued when the tape timer is zero, but a timing pulse is issued when the tape timer is at a value other than zero. It's okay.

Further, the code may be a code other than SMP TE, and the tape may be a film other than a magnetic tape.

Furthermore, the tape measuring means may be a tape length meter or the like other than a tape timer, and it is clear that the recording pattern of the program is not limited to that shown in FIG.

Since the present invention is constructed and operated as described above, the code can be read even when the tape is stopped, and its construction is extremely simple, and its practical effects are great.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the tape recorder of the present invention, Fig. 2 is a detailed view of the tape measuring means, and Fig. 3 is a plan view showing the tape recorder of the present invention.
The time code waveform diagram in FIG. 4 is a tape pattern used to explain the present invention. 1 is a tape recorder, 2 and 3 are reels, 4 is tape, 5
, 6, 13, and 14 are tape guides, 11 is a capstan, 12 is a pinch roller, 13a is a rotary disk, 13b is a through hole, 151 is a display device, 15 is a tape measuring means, 16 is a light emitting element, and 17 is a light receiver. Element 18 is a timer circuit.

Claims (1)

[Scope of utility model registration request] In a tape recorder that records a time code on a tape and detects a predetermined position of data based on the time code, the tape recorder includes a tape running measuring means for reading the tape running state. It is equipped with timing pulse generation means such as a timer, and when the predetermined head position of the data is detected, the timing pulse generation means is reset to zero, and then the tape is rewound for several seconds until the counter of the timing pulse generation means reaches zero. A code reading device configured to hold a time code reader for reading out the time code recorded on the tape when the time code is recorded on the tape.