JPS6087487A - Program retrieval device of magnetic tape recorder - Google Patents

Abstract

PURPOSE:To make entire rewinding of a magnetic tape unnecessary during retrieval, and to reduce a time of retrieval by automatically recording a cue signal and time data which indicate an absolute address when starting recording of a program. CONSTITUTION:When the magnetic tape recorder starts recording, it changes over the cue signal from a cue signal generating circuit 2, time data from a time data generating circuit 1 and a program signal, which is originally to be recorded from a program signal source 3 by a switch circuit 5 in succession, these signals and data are sent to a signal record circuit 6, and recorded on a magnetic tape 4 by a magnetic head 7. Next, to retrieve a program by utilizing the magnetic tape 4 where these signals are recorded, first the time in which a desired program is recorded is inputted by a key switch 9. When the magnetic tape recorder completes inputting these time data by a storage circuit 10, the retrieval is started, the signals recorded by the magnetic tape 4 is reproduced by the magnetic head 7 to amplify them by an amplifier circuit 8. The tape recorder sends a command signal to a tape travelling control circuit 14 by a cue signal detection circuit 12 if a cue signal exsists, and tape running is prepared for reproducing.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a strap search device for a magnetic recording/reproducing device such as a tape recorder or a video tape recorder, which searches for a program by incorporating time information. be.

Conventional configurations and their problems Traditionally, magnetic recording and reproducing devices such as tape recorders and video tape recorders have been required to have a function to search for programs. Cue cuing using signals has been used.

A conventional program search device for a magnetic recording/reproducing device using a key signal and a code signal will be described below.

Program retrieval using key signals was first applied primarily to video tape recorders. When starting recording, a signal of 30H2 is recorded as a cue signal for one second over the entire width of the tape by an erasing head. Next, when this key signal is detected while the tape is in fast forward mode, the tape is stopped running at the detected position or the tape is put into playback mode to search for the beginning of the program.

However, when searching for a program using such a key signal, it is necessary to check whether it is the desired program when the program is started, and in order to search for the desired program, it is necessary to check the program number. It is necessary to first input whether the tape is recorded on the tape, and then to start the search after rewinding the tape to the beginning of the tape, which has the disadvantage that it takes a long time to complete the search.

Next, when searching for a program using a code signal, the given program number is coded and recorded using a signal with a frequency below the audible range. Compare the numbers.

However, when using the code signal described above, when recording a program, it is necessary to specify the number of the program in advance and record it, which has the disadvantage of poor operability. Ta.

Purpose of the Invention The present invention has been made in view of the above-mentioned drawbacks, and provides a magnetic recording and reproducing device with excellent operability that allows program searches without requiring prior instructions when recording a program and without rewinding the tape when searching. The purpose of the present invention is to provide a program search device for the device.

Structure of the Invention In order to achieve the above-mentioned goals, the program search device for a magnetic recording/reproducing device of the present invention includes a time data generation circuit that generates time data, a cue signal generation circuit that generates a cue signal, and a time data generation circuit that generates a cue signal. a circuit for recording the cue signal and the time data on a magnetic tape via a magnetic head; an amplification circuit for amplifying the signal reproduced by the magnetic head; a key switch for presetting the time of a program to be searched; and the key. a memory circuit that temporarily stores the time data precented by the switch; a comparison circuit that compares the time data temporarily stored in the memory circuit with the time data reproduced by the magnetic head; and a comparison result of the comparison circuit. This configuration includes a control circuit for controlling the operation of the magnetic recording/reproducing device, and with this configuration, it is possible to search for a program by absolute address without rewinding to the beginning of the magnetic tape. DESCRIPTION OF AN EXAMPLE An embodiment of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram of a program search device for a magnetic recording/reproducing apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 1 indicates a time data generation circuit which has a clock function and generates time data, 2 indicates a key-signal generation circuit which generates a key-signal, and 3
6 is a program signal source for all or part of the program originally recorded on the magnetic tape 4; 6 is a switching circuit that sequentially switches the time data, the key signal, and the signal from the program signal source 3 according to the time from the start of recording; Reference numeral 6 denotes a signal recording circuit which performs signal processing so that the above three types of signals outputted from the switching circuit 6 are recorded on the magnetic tape 4 by the magnetic head 7;
9 is an amplifier circuit for amplifying the signal reproduced by the magnetic head 7; 9 is a key switch for inputting time data to be searched; 10 is a storage circuit for temporarily storing time data input from the key switch 9; 11 is a key switch 9 A comparator circuit 12 compares the time data inputted through the storage circuit 10 with the time data detected by the magnetic head 7 and recorded on the magnetic tape 4 via the amplifier circuit 8; 13 is a program signal reproducing circuit that reproduces a program signal from among the signals reproduced from the magnetic head 7; using the output signal.

This is a control circuit that controls tape running, etc. of a magnetic recording/reproducing device.

The operation of this embodiment configured as above will be described below.

First, when starting recording of each program, a key signal is sent from the key number generation circuit 2, time data is sent from the time data generation circuit 1, and a signal of the program to be originally recorded is sent from the program signal source 3 (in this embodiment, the audio ) are sequentially switched by the switching circuit 5, sent to the signal recording circuit 6, and recorded on the magnetic tape 4 by the magnetic head 7. In this case, the time data is written and left at the time of recording. Therefore, the same time data does not exist, and each program recorded on the magnetic tape 4 can have an independent absolute address. FIG. 2 is a recording arrangement diagram of each signal on the magnetic tape 4 recorded in this manner.

Next, in order to search for a program using the magnetic tape 4 on which these signals are recorded, first the time at which the desired program was recorded is input using the key switch 9.

When the input of this time data is completed in the storage circuit 1o, a search is started, and the signals recorded on the magnetic tape 4 are
The signal is reproduced by the magnetic head 7 and amplified by the amplifier circuit 8. If a cue signal is present in the amplified signals, the cue signal detection circuit 12 sends a command signal to the control circuit 14 to set the tape running to a reproduction state.

Since time data is recorded next to the magnetic tape 4 on the magnetic tape 4, this time data is reproduced and stored in the storage circuit 10.
It compares the preset time data with the preset time data and outputs a command signal to the control circuit 14 based on the result. in this case,
If the recorded time data is thicker than the preset time data, the magnetic tape 4 is rewound, and if it is smaller, it is unwound and the magnetic tape 4 is searched until they match. If they match, the reproduction state starts from that position, the magnetic tape 4 is run, and the program signal reproduction circuit 13 reproduces the program.

As described above, according to this embodiment, the key signal and the time data indicating the absolute address are automatically recorded in advance when recording a program, so that the recording number etc. of the program can be recorded as before. There is no need to preset in advance, and operability can be greatly improved. In addition, when searching for a program, the first detected time data is compared with the preset time data of the desired program, and based on the comparison result, it is automatically determined whether to rewind or feed the magnetic tape 4 and the search is performed. Therefore, there is no need to first rewind the entire magnetic tape 4 and perform a search operation.
Furthermore, since a desired program can be searched for using an absolute address, the amount of time spent searching can be reduced, and operability can be improved.

Effects of the Invention As described above, according to the program search device of the magnetic recording/reproducing device of the present invention, when starting recording of each program, a cue signal and time data indicating an absolute address are automatically recorded in advance. Therefore, there is no need to preset program record numbers etc. in advance as in the past, and when searching for a program, the first detected time data is compared with the preset time data of the desired program, and the comparison result is displayed. Since it automatically determines whether to rewind or start the magnetic tape and performs the search, there is no need to first rewind the entire magnetic tape and perform the search. It can be improved, and the effect is great.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a program search device of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a recording arrangement diagram of each signal on the same magnetic tape. 1... Time data generation circuit, 2... Cue signal generation circuit, 4... Magnetic tape, 5...
・Switching circuit, 6...Signal recording circuit, 7...
...Magnetic head, 8...Mountain/amplifier circuit, 9...
Key switch, 1o... River/memory circuit, 11...
-Comparison circuit, 14...control circuit.

Claims (1)

[Claims] a time data generation circuit that generates time data; a cue signal generation circuit that generates a cue signal; a circuit that records the cue signal and the time data on a magnetic tape via a magnetic head at the start of recording of each program; an amplifier circuit for amplifying the signal reproduced by the magnetic head; a key switch for presetting the time of the program to be searched; a memory circuit for temporarily storing time data preset by the key switch; and a memory circuit for temporarily storing time data preset by the key switch. A program search for a magnetic recording and reproducing device comprising a comparison circuit that compares time data with time data reproduced by the magnetic head, and a control circuit that controls the operation of the magnetic recording and reproducing device using the comparison result of the comparison circuit. Device.