JPH0242669A - Recording end edge retrieving device for digital audio tape recorder - Google Patents

Abstract

PURPOSE:To correctly execute an editing in the case of a splicing recording, etc., by causing a magnetic tape to travel in a positive direction when a tape top to travel in a reverse direction is detected, thereafter, stopping the magnetic tape with the detection of a recording end edge, and executing an end search. CONSTITUTION:The course rewinding of a REW traveling is executed, the tape top of the magnetic tape is detected, thereafter, the magnetic tape is made to travel in the positive direction, it is stopped in the position of the recording end edge detected first, and the end search is executed. By the completion of the end search, the recording end edge of RF recording parts recorded successively from a tape head, namely, the part to record the data can be retrieved. Thus, in the case of the splicing recording, etc., the continuities of a program number and an absolute time can be guaranteed, and simultaneously, the tape to execute a stable search action can be correctly edited.

Description

[Detailed description of the invention] [Technical field of invention].

The present invention relates to a digital audio tape recorder, and more particularly to a recording end search device for searching the recording end of a magnetic tape on which an information program is recorded.

[Technical background of the invention and its problems] A digital audio tape recorder records an audio signal such as music as digital data converted into a PCM signal onto a magnetic tape, reads out the recorded data, demodulates it, and reproduces the audio signal. This is a device designed for

Conventional digital audio tape recorders have a so-called end search function that automatically searches for the end of the recording area under the control of the system controller. It is used to search for the end of the last recorded song, such as when performing continuous recording to record a song after the already recorded song.

Figure 5 is a diagram explaining the operation of conventional end search, Figure 6 is a diagram explaining the operation of conventional end search.
The figure is a flowchart showing the control flow, and the fifth
Figure (a) shows a magnetic tape on which music has been recorded in advance, and Figures (g) and (c) show changes in the relative position of the reproducing head with respect to the magnetic tape.

When the system controller is instructed to perform an end search,
The following two types of control are performed depending on whether the position of the reproducing head with respect to the magnetic tape is in a portion where no information program data is recorded (RF unrecorded portion).

If the current position is in the RF unrecorded area, the medium speed rewind mode (REW running mode) is set from the current 5TOP position as shown in FIG. 4(b), and the playback signal (, RF When the rising edge of the double signal is detected and the end of recording is detected, the magnetic tape is set to 5TOP mode and the running of the magnetic tape is stopped to complete the end search.

If the current position is not in the RF unrecorded area, that is, in the area where data is recorded (RF recording area), the fast forward mode (FF running mode) starts from the current 5TOP position as shown in Figure (C). When the falling edge of the RF multiplied signal is detected and the end of recording is detected in this FF running mode, the mode is set to REW running mode, and thereafter, when the rising edge of the RF multiplied signal in the REW running mode is detected in the same manner as described above, the 5TO
Change to P mode and complete the end search.

In the REW running mode and the FF running mode, when tape 1-tip (BOT) or tape end (EOT) is detected, respectively, the 5TOP mode is set and the end search is stopped.

However, according to the conventional apparatus as described above, for example, as shown in FIG.
An end search is performed on the tape where the RF multiplied signal is recorded as divided, as in the divided RF recording section B.
If the search operation is started from the position or the position behind it! The end of this divided RF recording section B is searched as the recording end.

For this reason, when recording is performed after the end search described above, an RF unrecorded portion may be left between the recorded program and the program that has been continuously recorded from the beginning of the tape. Problems such as skipping sometimes occurred.

Furthermore, in digital audio tape recorders, it is possible to record program numbers as identification information of the recorded programs and absolute time information indicating the elapsed time when playing back from the beginning of the tape. When an RF unrecorded area is formed, the RF
Program numbers and absolute times may become discontinuous in unrecorded areas.
There have been problems such as the inability to effectively utilize the features of the digital audio tape recorder.

C. Object of the Invention The present invention enables a digital audio tape recorder to search for the recording end of an RF recording section that is continuously recorded from the beginning of the tape by completing an end search. The purpose is to be able to edit.

[Summary of the invention]

In a digital audio tape recorder, the present invention runs the magnetic tape in the reverse direction, runs the magnetic tape in the forward direction when the top of the tape is detected, and then stops the magnetic tape when the recording end is detected to perform an end search. I decided to do this.

〔Example〕

FIG. 1 is a block diagram of a digital audio tape recorder to which the present invention is applied, showing parts related to end search.

In the figure, reference numeral 1 denotes a mechanical unit that is set to a predetermined operation mode by a mechanism drive unit 2 and runs the magnetic tape 3 according to the set mode, and the magnetic tape 3 stored in a cassette half (not shown) is supplied. It is pulled out in a state wound around a reel 4 and a take-up reel 5, and is brought into contact with a rotating head 7 on which recording/reproducing heads 6a and 6b are arranged on a circumference extending at a constant angle.

When the mechanical section 1 is set to a predetermined mode such as the REW running mode or the FF running mode, the magnetic tape 3 is rotated in the forward direction and The data recorded on the magnetic tape 3 by running in the opposite direction is transferred to the head 6a.
, 6b.

10 is a top sensor for detecting the top of the magnetic tape (BOT), which optically detects the transparent leader tape and magnetic material portion attached to the edge of the magnetic tape using an infrared diode and a phototransistor. .

The reproducing amplifier 11 amplifies the output (RF multiplied signal) of the heads 6a and 6b to an appropriate level and sends it to the signal processing section 12 and the RF signal.
The signal is input to the signal detection section 13, and the signal processing section 12 extracts data of an information program such as music and data such as a program number from the input RF signal.

The information program data extracted by the signal processing unit 12 is converted into an analog signal by a D/A converter 14 to obtain an audio signal, and is also converted to an analog signal by a low-pass filter 15.
Unnecessary components in the high frequency range are removed by the signal, and the resultant signal is output to a subsequent circuit (not shown).

Note that data such as the program number is output to the system controller 16.

Further, the RF signal detection section 13 outputs a predetermined detection signal to the system controller 16 while the RF multiplied signal is detected from the output of the reproducing amplifier 11.

The system controller 16 outputs a predetermined control signal specifying the mode of the mechanical section 1 to the mechanism drive section 2, and performs an end search by shifting the mechanical section 1 to a predetermined mode as will be explained later. In addition, the system controller 16
An operating section 17 as an input means for giving operation instructions and a display section 18 for displaying the operating status of the device are connected to the device.

Note that the tape end (EO) is detected by a detection means (not shown).
When T) is detected, a detection signal is input to the system controller 16.

FIG. 2 is a diagram illustrating the end search operation of the embodiment, and FIG. 3 is a flowchart showing the control flow of the embodiment. Note that FIG. 2(a) shows a magnetic tape in which a continuous RF recording section and a separated RF recording section are formed from the beginning of the tape, and □□□) in the same figure shows the contact position of the reproducing head 6 with respect to the magnetic tape 3. It shows the change in

When an end search is instructed from the operation unit 17, the system controller 16 outputs a control signal to the mechanism drive unit 2, sets the mechanism unit 1 to the REW running mode, and rewinds the magnetic tape 3 from the current position. let

RE W System controller 1 in driving mode
6 monitors the output of the top sensor 10 and detects the tape top (
When BOT) is detected, a control signal is output to the mechanism drive unit 2 to set the mechanism unit 1 to the FF running mode and cause the magnetic tape 3 to run in the forward direction.

In the above FF driving mode, the system controller 1
6 monitors the output of the RF signal detection section 13, and when it detects the fall of the RF multiplied signal, that is, the end of recording, based on a change in the detection signal of the RF signal detection section 13, it outputs a control signal to the mechanism drive section 2. Set the mechanical section 1 to REW running mode.

Incidentally, if the tape end (EOT) is detected before the fall of the RF multiplied signal is detected in the FF running mode, the mechanical section 1 is set to the 5TOP mode and the end search is stopped.

When the REW running mode is set by detecting the fall of the RF multiplied signal, the RF signal detection unit 1
3, and when the RF multiplied signal rises due to a change in the detection signal of the RF signal detection section 13, that is, the end of recording is detected, the system controller 16 outputs a control signal to the mechanism drive section 2, and the system controller 16 outputs a control signal to the mechanism drive section 2. 1 to 5TOP mode and complete the end search. Incidentally, if the tape top (BOT) is detected before the rise of the F times signal during constant REW running is detected, the mechanical section 1 is set to the 5TOP mode and the end search is stopped.

When the end search is completed in this way, the RF recorder continues from the beginning of the magnetic tape without detecting the end of the RF recording section B recorded in sections on the magnetic tape.
The end of recording section A is the head position.

Then, when a recording operation is instructed after the end search is completed, such as when performing splice recording, the program is recorded successively in the RF recording section A continuous from the beginning of the tape.

In the above embodiment, when searching for the recording end, the boundary between the RF recorded part and the RF unrecorded part is detected based on the RF multiplied signal, but according to the R=DAT standard, the recording end of the information program is Since the ID code indicating the program number, that is, PNo-ID, is determined to be recorded as "'OEE" (hexadecimal notation), this PNo-I
It is also possible to detect that D is "OEE" and search for the recording end.

Alternatively, both of the above-mentioned PNo-IDs of the RF multiplied signal may be monitored, and when either one satisfies the search conditions, the search for the recording end portion may be completed.

〔Effect of the invention〕

As explained above, according to the present invention, in a digital audio tape recorder, the tape top of the magnetic tape is detected by performing REW running, and then the recording end is detected first by running the magnetic tape in the forward direction. Since the end search is performed by stopping at the position of , when the end search is completed, it is possible to search for the recording end of the RF recording section that is continuously recorded from the beginning of the tape.
It is possible to detect the continuity of program numbers and absolute time during splice recording, etc., and to edit tapes correctly so that stable search operations can be performed.

This makes it possible to effectively utilize the features of the digital audio tape recorder.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a digital audio tape recorder to which the present invention is applied, Fig. 2 is a diagram explaining the end search operation in the embodiment, Fig. 3 is a flowchart of the embodiment, and Fig. 4 explains the problems of the conventional method. FIG. 5 is a diagram explaining the conventional end search operation, and FIG. 6 is a flowchart showing the conventional end search control. 1... Mechanical part, 2... Mechanism drive part, 10...
・Top sensor, 13...RF signal detection section, 16...
・System controller. Figure

Claims (1)

[Scope of Claims] A recording end search device for a digital audio tape recorder that performs recording and playback on a magnetic tape on which an information program is recorded, wherein the magnetic tape is run in a forward direction or in a reverse direction depending on a set mode. and tape driving means for stopping the magnetic tape, tape top detection means for detecting the tape top of the magnetic tape, recording end detection means for detecting the end of the recording area of the magnetic tape from the read signal of the magnetic tape, and the tape control means for setting the mode of the tape drive means based on detection signals from the top detection means and the recording end detection means, the control means for controlling the magnetic tape by inputting a predetermined search command signal When the tape top is detected based on the detection signal of the tape top detection means, the magnetic tape is run in the forward direction, and the unrecorded portion of the magnetic tape is detected based on the detection signal of the recording end detection means. A recording end search device for a digital audio tape recorder, characterized in that it detects the beginning and stops the magnetic tape.