JPH0426953A - Information recorder - Google Patents

Abstract

PURPOSE:To eliminate the need of manual switching by reading a code showing the inhibition of copying and automatically selecting one of a signal from an analog input terminal and a signal from a digital input terminal corresponding to the read result. CONSTITUTION:When the second pit of a control code is zero (digital copying is inhibited), the category code is read. When the category code shows a CD, general, a PCM encoder/decoder or the like, the digital copying is executed. When the category code shows a digital audio tape recorder (DAT), a signal processing part 2 is controlled by a control part 14 and a signal inputted from an A/D conversion part 1 is selected. Due to that, the signal inputted from the conversion part 1 is recorded on a magnetic tape 7. Therefore, the code showing the inhibition of the copying is read and one of the signal from the analog input terminal 8 and the signal from the digital input terminal 9 is selected corresponding to the read result. Thus, the need of the manual switching is eliminated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applied to a digital audio tape recorder (DAT).
) related to information recording devices represented by.

[Prior Art] DAT records audio signals digitally on magnetic tape, has good sound quality, and is becoming popular.

This DAT usually includes an analog signal input terminal and a digital signal input terminal, and the digital input signal is recorded on the magnetic tape after being converted into the DAT format. On the other hand, analog input signals are A/D converted and then processed in the same way as digital input signals.

In playback mode, the audio signal played from the magnetic tape is converted to an analog signal and then output from the analog output terminal, or the signal is output as a digital signal for copying to another magnetic tape, etc. A digital output terminal for output is also provided.

[Problems to be Solved by the Invention] Conventionally, a user has been required to manually select whether to record a signal input from an analog input terminal or a signal input from a digital input terminal. was.

However, with DAT, for example, copying of a magnetic tape with digital signals intact is limited to one time, and two times.
It is requested that copying more than once is prohibited. When copying a magnetic tape, the user usually does not know the number of times the magnetic tape has been copied. As a result, the DA that has the function of prohibiting such copying more than once
When copying at T, if one actually performs digital copying and finds that it is impossible, one has to switch to analog copying, which is inconvenient.

The present invention has been made in view of this situation, and is intended to automatically perform digital copying if it is permitted.

[Means for Solving the Problems] An information recording device of the present invention includes an analog input terminal into which an analog signal is input, an A/D conversion section which A/D converts the analog signal input from the analog input terminal, Select either the digital input terminal into which the digital signal is input, the signal A/D converted by the A/D converter, or the digital signal input from the digital input terminal, and record it on the recording medium. The signal processing unit is characterized by comprising a signal processing unit that performs processing, and a control unit that reads a predetermined code included in the digital signal input from the digital input terminal and controls the selection of the signal to be processed in the signal processing unit. do.

[Operation] In the information recording device having the above configuration, for example, a code indicating prohibition of copying is read, and depending on the reading result, either a signal from an analog input terminal or a signal from a digital input terminal is output. select. Therefore, manual switching becomes unnecessary, and operability is improved.

Embodiments Before describing the present invention in detail, the format (of digital signal output in DAT) will be explained.

For DAT, CD, etc., the format of digital signal output is determined as shown in FIG. That is, 192 frames constitute one block, and each frame consists of two subframes. A 4-bit M or W synchronization preamble is placed at the beginning of each 32-pit subframe. However, the synchronization preamble of the first subframe of each block is B.

In each subframe, after the synchronization preamble,
A 4-bit okjiyari code is placed, followed by a 2-bit
0-bit audio data is arranged. The last 4 bits are a subcode consisting of 1 bit each of v, u, c, and p.

Among these, subcode C represents the channel status, and as shown in FIG.
2 bits) are collected to form a predetermined format.

Of these bits, the first to fifth bits are used as a control code, and the second bit indicates that digital copying is prohibited. When this bit is 0, digital copying is prohibited, and when it is 1, it is permitted. Ru.

The 8 bits from the 8th bit to the 15th bit are used as a category code, which indicates the category of the audio data recorded on the magnetic tape. (O○0
00000) represents general, (]○000000) represents CD (compact disc), (01000000) represents PCM encoder/decoder, and (11oooooo○) represents DAT, respectively.

Next, an embodiment of a DAT to which the information recording apparatus of the present invention is applied will be described with reference to FIG.

When the operation section 15 is operated and the recording mode is commanded, the control section 14, which is made up of, for example, a microcomputer, controls each circuit, means, etc., and performs the recording operation, for example, according to a flowchart as shown in FIG. Execute it.

First, the magnetic tape 7 (recording medium) is rewound a little, and if there is a track that has already been recorded, it is adjusted so that a newly formed track follows it (step S
l).

For example, assume that an analog audio signal reproduced from another DAT is input to the analog input terminal 8, and a corresponding digital audio signal is input to the digital input terminal 9.

An analog audio signal input from the analog input terminal 8 is A/D converted by the A/D converter 1 and supplied to the signal processor 2 .

On the other hand, the digital audio signal inputted from the digital input terminal 9 is inputted to the frame decomposition section 11 and decomposed into data for each frame.

The audio data extraction section 12 extracts audio data from the data decomposed into frames by the frame decomposition section ll, and outputs it to the signal processing section 2.

Furthermore, the channel status extraction unit 13 extracts a channel status code from the data decomposed into frames, and outputs it to the control unit 14. The control unit 14 reads the input channel status code according to format 1 shown in FIG. 3 (step S2).

The control unit 14 reads the second pit of the control code (step S3), and when it is 1 (digital copy permission), controls the signal processing unit 2 to select the signal input from the audio data extraction unit 12. (Step S
7). After each servo system is stabilized, the signal processing section 2 stores the signal input from the audio data extraction section 12 in the storage section 3.
After being subjected to processing such as addition of an error correction code and interleaving, the signal is supplied to the signal recording section 4. Signal recording section 4
modulates the input signal and supplies it to a rotary head 6 rotated by a drum 5 to record it on a magnetic tape 7 (
Step S6).

On the other hand, when the second bit of the control code is O (digital copy prohibited), when the category code is read and it is CD, general, PCM encoder/decoder, etc., digital copy is prohibited as in the above case. Execute (steps S3 and S4).

When the category code is DAT, the control section 14 controls the signal processing section 2 to select the signal input from the A/D conversion section 1 (step S5).

As a result, the signal input from the A/D converter 1 is processed in the same manner as described above and recorded on the magnetic tape 7.

Also, at this time, the control unit 14 causes the display unit 16 to display a message that digital copying is prohibited (analog copying has been selected), as necessary.

[Effects of the Invention] As described above, according to the information recording device of the present invention, for example, a code indicating prohibition of copying is read, and a signal from an analog input terminal or a signal from a digital input terminal is output in response to the reading result. Since one of the signals is automatically selected, manual switching is no longer necessary, and operability is improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment in which the information recording device of the present invention is applied to a DAT, and FIGS.
4 is a diagram explaining the format of DAT, and FIG. 4 is a flowchart explaining the operation of the embodiment of FIG. 1. 1...A/D conversion section 2...Signal processing section 4...Signal recording section 7.Magnetic tape 8..Analog input terminal 9..Digital input terminal 11'.Frame decomposition section 12--Audio Data extraction unit 13...Channel status extraction unit 14...Control unit Patent applicant: Casio Computer Co., Ltd.

Claims (1)

[Claims] An analog input terminal into which an analog signal is input, an A/D conversion section which A/D converts the analog signal input from the analog input terminal, and a digital input terminal into which a digital signal is input. , a signal processing unit that selects either the signal A/D converted by the A/D conversion unit or the digital signal input from the digital input terminal, and performs processing for recording on a recording medium; An information recording device comprising: a control unit that reads a predetermined code included in a digital signal input from the digital input terminal and controls selection of a signal to be processed in the signal processing unit.