JPH04147487A - Recorder - Google Patents

Abstract

PURPOSE:To confirm a kind of an external device by detecting classified information of an input digital signal to be inputted from the external device and displaying a classification of the external device based on a detecting result of the classified information. CONSTITUTION:When a category code of the input audio signal S1 which is presently inputted from a memory circuit 6 is read out by a digital signal processing circuit 3, a category code table stored in a built-in solid memory is retrieved to discriminate an input source, and a control data based on a discriminating result is sent out as a control data signal S5 to a system control circuit 7. The whole operation of the subject DAT 1 is controlled by the system control circuit 7 in response to an operation of a prescribed operator, and also a category display signal S6 is sent out to a display circuit 8 based on the control data signal S5. By this method, a prescribed light emitting diode is lit in accordance with the input source of the input audio signal S1 which is presently inputted, so that the classification of the external device can easily be confirmed.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a recording device, and is suitable for application to, for example, a digital audio tape recorder.

B. Summary of the Invention The present invention detects classification information of an input digital signal input from an external device in a recording device, and displays the type of the external device based on the detection result of the classification information. The type can be easily confirmed.

C. Prior Art Conventionally, there is a recording device (hereinafter referred to as a digital audio tape recorder) that is capable of recording and reproducing digital audio signals on a magnetic tape using a rotating drum.

This type of digital audio tape recorder (hereinafter referred to as D
(referred to as an AT) performs analog/digital conversion processing and This effectively avoids deterioration in sound quality of audio signals that occurs during digital/analog conversion processing.

D Problem to be Solved by the Invention By the way, in a digital audio tape recorder that uses various externally connected devices as an input source and constitutes a system as a whole, it is difficult to determine which digital audio signal is currently being input to the digital audio signal input terminal. It would be convenient if it was possible to easily check whether an externally connected device is used as an input source.

The present invention has been made in consideration of the above points, and attempts to propose a recording device that displays the input source of the digital audio signal input to the recording device and allows the user to easily confirm the input source of the digital audio signal. It is something to do.

8 Means for Solving the Problems In order to solve the problems, in the present invention, in the recording device 1 that records the input digital signal S1 input from an external device, classification information of the external device is detected from the input digital signal S1. A category code detection means 3 and a display means 8 for displaying the type of external device based on the detection result of the category code detection means 3 are provided.

By detecting the classification information of the external device from the input digital signals S1 which are sequentially input in the F-action category code detection processing means 3, and displaying the type of the external device on the display means 8 based on the detection result of the classification information, The user can easily confirm the type of external device.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, ``■'' indicates a DAT as a whole, and is designed to record and reproduce digital audio signals in a predetermined signal format.

That is, DATl inputs the input audio signal Sl to the digital signal processing circuit 3 via the input buffer circuit 2 having a buffer configuration, and also inputs the input audio signal Sl to the digital signal processing circuit 3.
is outputted from the digital signal processing circuit 3 via an output buffer circuit 4 having a buffer configuration.

As shown in Figure 2, the digital audio signals input and output as the input and output audio signals Sl and S2 are EIAJ (Electronic Industries Association of Japan Standards) so that digital data can be directly exchanged between digital devices. It is designed to be transmitted in a specified signal format.

As shown in Figure 2 (A), the digital audio signal is repeatedly and continuously transmitted using frame data from the ``0'' frame to the r191 J frame, and the frame data is transmitted at a sampling period. be done.

The frame data consists of subframe data for the left channel and right channel (Fig. 2 (B)) each consisting of 32 bits, and the first 4 bits of each subframe data are allocated to the synchronization preamble data δ. (Figure 2 (C)).

The subframe data is further allocated to the following 4 bits, auxiliary data, 20 bits of audio data, and 4 bits (1), u, c, and p, each consisting of 1 bit.

Here, the V bit is a parity flag indicating whether data is valid or invalid, and the U bit is a user pit that transmits subcode information.

Further, the C pit is a channel status that defines the nature of transmission data, and the P bit is designed to indicate a parity pit for detecting data errors.

When the digital signal processing circuit 3 receives an input audio signal S1, it interleaves the signal and stores it in the memory circuit 6, adds an error detection and correction code, and outputs it to the recording/reproducing amplifier circuit 5 as a recording signal S3 together with predetermined subcodes, etc. do.

At this time, the digital signal processing circuit 3 extracts the channel status C from each frame of the input audio signal S1 and stores it in the RAM (Random Access Mem
ory ) configuration as a channel information signal S4, and bit data consisting of channel status C of frames "0" to r191 J frames are sequentially arranged and stored as shown in FIG. is being done.

In this embodiment, this channel status C includes
Starting from the bit, "0" indicates the input from the consumer audio digital equipment, the first to fifth bits are control information indicating the type of data, control, etc., and the sixth and seventh bits are "00" indicating the hold mode. ” is written.

A category code is assigned to the following 8th to 15th bits, and bit data indicating the input source of the digital audio signal and permission/disapproval of digital copy based on the serial copy management system (SCMS) is written. ing.

Data indicating the source number, channel number, sampling frequency, clock accuracy, etc. is recorded in the channel status C in the following order, with predetermined bits being allocated.

Here, the category code represented by the 8 bits from the 8th bit to the 15th bit is r
00000000 J indicates that the input is from a general satellite broadcast receiver (so-called BS tuner), r
01000000 J by P CM (Pulse
C.

de Modulation) indicates that the input is from the processor. Also r 10000000
J and r 10000001" indicates that the input is from a compact disc player, and r 0010
0000 J and r 00100001" to indicate input from a satellite broadcasting receiver, and r 110
00000 J and r 11000001 J indicate inputs from other DATs.

Here, in DATI, when the 15th bit is "1", it indicates that digital copy is permitted only once,
When it is "0", it indicates that digital copying is prohibited.

When the digital signal processing circuit 3 reads the category code of the input audio signal S1 currently input from the memory circuit 6, it searches the category code table (Fig. 4) stored in the built-in solid-state memory and determines the input source. , control data based on the determination result is sent to the system control circuit 7 as a control data signal S5.

The system control circuit 7 responds to the operation of a predetermined operator to
In addition to controlling the overall operation of ATI, the control data signal S
5, a category display signal S6 is sent to the display circuit 8. As a result, a predetermined light emitting diode (L
ED) is turned on.

Further, the recording/reproduction amplifying circuit 5 records the recording signal S3 inputted from the digital signal processing circuit 3 onto a magnetic tape via magnetic heads 9A and 9B mounted on a rotating drum 9 at an angular interval of 180 degrees. Also, during playback, the recording/playback amplification circuit 5
reads the reproduction signal from the magnetic heads 9A and 9B,
The signal is amplified and sent to the digital signal processing circuit 3.

The digital signal processing circuit 3 performs error correction processing on the reproduced signal, performs deinterleaving processing, and outputs the signal as an output audio signal S2.

In the above configuration, when the digital signal processing circuit 3 receives the input audio signal S1 via the input buffer circuit 2, it interleaves the input audio signal S1, stores it in the memory circuit 6, and sequentially processes the input audio signal S1 with an error correction code. Record on magnetic tape.

At this time, the digital signal processing circuit 3 simultaneously stores the channel status in the memory circuit 6 and executes the procedure shown in FIG.

The digital signal processing circuit 3 moves from step SPI to step SP2, determines whether the digital audio signal currently being processed is the input audio signal S1, and if a negative result is obtained, repeats step SP2.

If a positive result is obtained, the digital signal processing circuit 3 moves to step SP3, and determines whether or not the input device is a compact disc player. That is, after reading the category code of the input audio signal S1 from the memory circuit 6, the digital signal processing circuit 3 reads the category code "10" indicating the input from the compact disc player.
000000 J or r 10000001 J is determined.

If a positive result is obtained here, the digital signal processing circuit 3
moves to step SP4, sends the control data signal S5 to the system control circuit 7, and sends the control data signal S5 to the first
Lights up the light emitting diode. Here, the first light emitting diode is arranged above a message indicating input from a compact disc player formed on the display panel, so that the user can easily recognize that the input source is the compact disc player. It can be confirmed.

After turning on the first light emitting diode, the digital signal processing circuit 3 moves to step SP5 and ends the process.

On the other hand, if a negative result is obtained in step SP3, the digital signal processing circuit 3 moves to step SP6, and the category code read from the memory circuit 6 is the category code r 001 indicating input from the satellite broadcasting receiver.
00000 J or r 00100001 J. If a positive result is obtained, step SP
Move on to 7. Here, the digital signal processing circuit 3 sends a category display signal S6 to the display circuit 8 via the system control circuit 7.
After sending out and lighting up the second light emitting diode, the process moves to step SP5 and ends the process.

Here, the second light emitting diode is arranged above a message indicating input from a satellite receiver formed on the display panel, so that the user can know that the input source is the satellite receiver. It can be easily confirmed.

Further, if a negative result is obtained in step SP6, the digital signal processing circuit 3 moves to step SP8 and inputs the category code r indicating that the category code is input from the DAT.
11000000 J or r 11000001".

If a positive result is obtained here, the process moves to step SP9 to light up the third light emitting diode, and then to step SP5 to end the process, whereas if a negative result is obtained, the process moves directly to step SP5 to light up the third light emitting diode. Finish the process.

Here, the third light emitting diode is arranged above the message indicating the input from the DAT formed on the display panel, so that the user can easily confirm that the input source is the satellite receiver. can do.

According to the above configuration, by detecting the category code of the input audio signal input from the external device and displaying the type of the external device, the user can determine which input source the digital audio signal currently being recorded is being input from. It is possible to easily check whether there is a digital audio tape recorder, and it is possible to obtain a digital audio tape recorder that is more convenient to use than the conventional one.

Note that in the above embodiment, the input audio signal S1
Although the case where the input source is displayed during recording has been described, the display timing according to the present invention is not limited to this, and the input source may be displayed only when the input source display button is turned on.

Furthermore, in the above-described embodiment, a case has been described in which a compact disc player, a satellite broadcast receiver, or a DAT is identified and displayed as an input source, but the present invention is not limited to this. You can also do it.

Furthermore, in the above-described embodiment, a case was described in which the input source is displayed by lighting a predetermined light emitting diode arranged on the display panel, but the display means according to the present invention is not limited to this, and the display means shown in FIG. As shown in A) and (B), CD, B
S etc. may be displayed.

Further, in the above-described embodiments, a compact disc player, a satellite broadcasting receiver, etc. are displayed as input sources, but the present invention is not limited to this.
Various combinations of input source displays can be selected.

Further, in the above-described embodiments, the case where the present invention is applied to a digital audio tape recorder has been described, but the present invention is not limited to this. Applicable to equipment.

H Effects of the Invention As described above, according to the present invention, the classification information of the external device is detected from the input digital signal, and the type of the external device is displayed by the display means based on the detection result of the classification information. This allows the type of external device to be easily confirmed, further improving usability for the user.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of a digital audio tape recorder that does not include a recording device according to the present invention, Fig. 2 is a route map showing the format of the digital audio signal, and Fig. 3 shows the configuration of channel status. Figure 4 is a diagram showing the types of category codes, Figure 5 is a flowchart showing the input source discrimination processing procedure,
FIG. 6 is a route map for explaining another embodiment. 1...Digital audio tape recorder,
3...Digital signal processing circuit, 5...
- Recording/reproducing amplifier circuit, 7...System control circuit, 8...Display circuit.

Claims (1)

[Scope of Claims] A recording device for recording an input digital signal input from an external device, comprising a category code detection means for detecting classification information of the external device from the input digital signal, and a detection result of the category code detection means. and display means for displaying the type of the external device based on the recording device.