JPH0369066A - Data display method for rotary head type digital recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent a display screen from being disturbed with erroneous data by stopping the output of characters to a display device in the case the error rate of reproducing data is more than a reference value when the character information is displayed by the display device at the time of reproducing. CONSTITUTION:At the time of reproducing, the average of each error rate is calculated at every tracing by a rotary head 3 and compared with the prescribed reference value. When the mean value is smaller than the reference value, character data are prepared from data, which are obtained from a signal processing circuit 10, by a sub code processing circuit 13. The data are sent to a control circuit 21 and according to the data, the circuit 21 controls an LCD driver 30 and displays the characters in an LCD module 31. When the mean value is larger than the reference value, the characters displayed in the LCD module 31 are erased by sending out a code, which clears the picture, to the control circuit 21. Further, when it is not desired to wholly erase the picture, the pictures in the following rows are cleared while remaining the displayed characters by selecting a line feeding code instead of the clear code.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a rotary head-type digital audio tape recorder (hereinafter referred to as R-DAT) that records and reproduces digital signals using a rotary head, and in particular, This invention relates to a data display method for R-I) AT that displays information.

(B) Prior Art The following is a brief explanation of the 7-ohm R-DAT.

FIG. 3 shows a track format in which a 128-block PCMQ area is formed at the track center, a 5-block tracking area on each side of the PCMQ area, and an 8-block subcode area each outside the tracking area.

One block of the subcode area is constructed as shown in Fig. 4, with 8 bits of 5YNC1, 8 bits of W, .
Wt Consists of an 8-bit Parinano ID and 256-bit subcode data.

As shown in Fig. 5, the 256-pit sub-data consists of four pieces of 64-bit back information, and the back information is further divided into 8-bit units of PCl, PC2, and P.
The upper 4 bits of PCI are pack items for identifying contents such as program time, absolute time, running time, and TOC information, and the lower 4 bits of Pct and a total of 52 bits from PO2 to PO7 indicate pack data. , PCB are assigned as pack parities of PCI to PO7. Note that character information (for example, song name, singer name, etc.) is also recorded in the subcode area as pack information. (Refer to Japanese Unexamined Patent Publication No. 168884/1984).

(C) Problems to be Solved by the Invention However, although error correction processing such as parity check is performed when character information is reproduced to prevent erroneous data from being output, the erroneous data is output to the display device. If such erroneous data is output to the display device, not only the characters and characters displayed may be completely different, but also the screen may be distorted, which may be harmful to the user. It was very inconvenient.

(D) Means for Solving the Problems The present invention provides a tracking area in each track of a tape that is helically scanned by a rotary head together with a PCM area.
In a rotary head type 7 digital recording and reproducing device capable of recording digital data by forming a subcode area and further reproducing a magnetic tape on which recording tracks are formed, character information is recorded as data in the subcode area,
Data of a rotary head type digital recording and reproducing device, characterized in that character output to the display device is stopped when the error rate of the reproduced data exceeds a reference value when displaying the character information on the display device during reproduction. Suggest display methods.

(e) Effect: According to the above means, when the error rate of the reproduced data exceeds the reference value, the output to the display device that displays the character information in the reproduced data can be stopped.

(F) Embodiment Hereinafter, the configuration of an R-DAT device for realizing the display method of the present invention will be explained with reference to the block diagram of FIG. In the figure, (1) is an input terminal into which an analog audio signal is input, and (2) is an input terminal that converts this voice signal into a digital signal that has undergone interleaving, time compression, etc.
(3) is a servo signal generation circuit that generates servo signals (i.e., pilot signals, sync signals, etc.) for tracking control; (4) is a servo signal generation circuit that generates servo signals (i.e., pilot signals, sync signals, etc.) for tracking control; (5) is a subcode signal generation circuit that generates a subcode signal including character information such as the track number, time information, and song title along with the star ID for high-speed search; (5) is the recording of information formed on each track of the tape; (6) is a recording amplifier; (7) is a recording A rotary transformer with a rotary head cylinder that supplies the output from the amplifier (6) to two recording/reproducing rotary heads (8) 1800 degrees apart, (9) is a playback amplifier, and (10) is the output from the playback amplifier (9). A digital signal processing circuit that generates a clock from the output data using a PLL, converts it into a digital signal, and then converts it into an analog signal (PCM demodulation). (11) is an output terminal from which the original analog audio signal is output. It is. (12) is a servo circuit that extracts a servo signal for tracking control from the output of the reproducing amplifier (9) and generates a track tracking error signal; (13)
) is a subcode processing circuit that extracts a subcode signal from the output of the reproduction amplifier (9) and performs detection of D and reading of P time, etc. (14) is a take-up reel motor that directly drives the take-up reel shaft; (15) is a supply reel motor that directly drives the supply reel shaft; (16) is a supply reel motor that directly drives the supply reel shaft;
) is its motor drive circuit, (17) and (18) are the cylinder motor and its motor drive circuit, and (19) and (20) are the capstan motor and its motor drive circuit. (21) is the manual input of various operation keys and the subcode processing circuit (
Each motor (14) (15) (1
7) A control circuit that controls the drive/stop, rotation speed, rotation direction, etc. of (19), and is configured by a microcomputer. (22) is a tape wrapped at 90° around the rotating head.

Therefore, during recording, the audio signal input to the input terminal (1) is first converted into a digital signal by the digital signal processing circuit (2), and then the servo signal (pilot signal or sync signal) is output from the servo signal generation circuit (3). etc.) and the subcode signal (star) ID, track number, P time) generated by the subcode generation circuit (4) and the recording amplifier (
6). The output of this recording amplifier (6) is then transferred to the rotary transformer (7) of the rotating head cylinder.
The recorded data is sent to the recording/reproducing rotary head (8) and recorded on the tape.

Next, during reproduction, various signals recorded on the tape (22) are read by the recording/reproducing rotary head (8) and sent from the rotary transformer (7) of the rotary head cylinder to the reproduction amplifier (9). And this playback amplifier (9
) is output by a digital signal processing circuit (10), which generates a clock from data using a PLL or the like, converts it into a digital signal, converts it into an analog signal, and outputs the original audio signal from the output terminal (11). That will happen. Furthermore, the output of this reproduction amplifier (9) is connected to a servo circuit (
12), where the servo signal for tracking control is extracted and a tracking error signal is generated,
This is sent to the motor drive circuit (20) to control the capstan motor (19). In addition, a playback amplifier (9
) is also sent to the subcode processing circuit (13),
Here, the subcode signal is extracted and the track number, time information, etc. are read and passed through the control circuit (21) to the LCD driver (3).
0) to the LCD module (31) to display the song number, time, etc.

Next, the display method of the present invention will be explained with reference to the flowchart of FIG. 1. The operations in this flowchart are performed by the subcode processing circuit (13), and the signal processing circuit (10) transmits the error rate information to the subcode processing circuit (13).
13).

First, in step 1, for example, take the average error rate for each trace of three rotation head traces, and then
When the average value is smaller than the reference value (less error), the subcode processing circuit (13) uses the data obtained from the signal processing circuit (10) to create character data. Step 3), send the data to the control circuit (21) (Step 4), and send the data to the control circuit (21).
) controls the LCD driver (30) according to the data and displays characters on the LCD module (31). In addition, if the average value is larger than the reference value (there are many errors), the code to clear the screen is sent to the control circuit (2) in step 5.
1) by sending it to the LCD module (31)
Erase the characters displayed in .

Also, if you do not want to erase the entire screen, you can send a new line code instead of the clear code to clear the screen from the next line while leaving the displayed characters.

(G) Detailed Description of the Invention According to the present invention, the display screen of the display device is not disturbed by erroneous data, and it is possible to provide a data display method that is very convenient for the user.

[Brief explanation of drawings]

Fig. 1 is a flowchart for explaining the data display method of the present invention, Fig. 2 is a block diagram of the R-DAT device for realizing the data display method of the present invention, and Fig. 3 is a flowchart for explaining the data display method of the present invention.
Figure 4 shows the track format of the AT device.
FIG. 5 is a diagram showing the block format of the subcode of the R-DAT device. (8)... Rotating head, (31)... Display device (L
CD module).

Claims (1)

[Claims] (1) A rotary head that records digital data by forming a tracking area and a sub-code area along with a PCM area on each track of the tape that is helically scanned by a rotary head, and can also play back the magnetic tape on which recording tracks have been formed. In the type digital recording and reproducing device, character information is recorded as data in the subcode area,
Data of a rotary head type digital recording and reproducing device, characterized in that character output to the display device is stopped when the error rate of the reproduced data exceeds a reference value when displaying the character information on the display device during reproduction. Display method.