KR950013378B1 - Sub-code recording system of dat recorder - Google Patents

Abstract

a user input unit for inputting a subcode; a control unit for sensing the input of the subcode to generate a data selection signal; a converting unit for converting an analog voice signal into digital voice data; a latch unit for selectively latching one of the digital voice data from the converting unit and digital voice data outputted from external equipments in response to the data selection signal; a memory for storing the latched digital voice data; an error correcting code unit for coding the data stored in the memory; a modulating unit for generating a synchronous signal under a predetermined control and for modulating the subcode inputted to 8→10 data; and a data generating unit for non-return-to-zero inverted modulating the 8→10 data to generate data to be recorded in a digital audio tape recorder.

Description

Subcode recorder for digital audio tape recorders

1 is a block diagram of a subcode recording apparatus of a digital audio tape recorder according to the present invention.

2 is an exemplary tape recording format to which the present invention is applied.

3A is a configuration diagram of a main ID.

3B is an exemplary diagram of bit allocation of ID1-ID7 among main IDs.

4A is a configuration diagram of a sub ID.

4B is a detailed illustration of a control ID among the sub IDs.

4C is a detailed illustration of a program number ID among the sub IDs.

5 is a configuration diagram of sub data, a pack ID and a pack position example.

* Explanation of symbols for main parts of the drawings

10: microcomputer 20: microcomputer interface unit

30: recording control unit 40: NRZI modulation unit

50: tape 60: recording timing generator

70: analog / digital converter 90: error correction

80: data latch / conversion section 100: memory

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sub code recording apparatus in a digital audio tape recorder, and more particularly to a sub code recording apparatus in which a sub code transmitted from a microcomputer and a sub code generated by itself are mixed and recorded on a tape.

Digital audio tape (hereinafter referred to as DAT) DAT has convenient functions such as song number display, time display, and various search functions to find and play the head of the song. This is possible because the subcode information can be read. There are two types of DAT subcodes. One is a control signal necessary for reproducing the main signal (music signal) such as sampling frequency and the number of channels, and the other is an additional signal such as song number, time, image signal, and the like. The former is called identification and the main signal related to the main signal is the main-ID and the additional signal is called the subcode ID.

These subcodes should not only be recorded for easy use by the user, but also be able to record the desired subcodes.

Accordingly, an object of the present invention is to provide a subcode recording apparatus in which a part of a subcode is generated by itself and recorded on a tape, and a part of the subcode is recorded by a microcomputer so that a subcode desired by a user can be accurately recorded on the tape.

The sub code recording apparatus for achieving the above object is a digital audio tape recorder comprising: user input means for inputting a sub code, control means for detecting the input of the sub code and generating a data selection signal, and analog voice Means for digitally converting a signal and outputting digital voice data; means for selectively converting one of the digitally converted voice data and a digital voice data output from an external device in response to the data selection signal to perform predetermined conversion; A memory for storing the latched and converted digital voice data, error correcting means for encoding the data stored in the memory, means for generating a synchronization signal under predetermined control and modulating the input subcode 8 → 10; The digital audio tape by performing non-zero return inversion modulation on the 8 → 10 modulated data. It characterized by a means adapted to generate the data to be written.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. Also, in the following description, many specific details such as components of specific circuits are shown, which are provided to help a more general understanding of the present invention, and the present invention may be practiced without these specific details. It will be obvious to those of ordinary skill in Esau. In the following description of the present invention, detailed descriptions of related well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention.

1 is a block diagram of a subcode recording apparatus of a digital audio tape recorder according to the present invention, when a user inputs a predetermined key through a key input means (not shown) to record a desired subcode on a tape. The microcomputer 10 which detects this and generates a corresponding subcode and various data, an analog / digital converter 70 for digitally converting the analog voice signal q and outputting the digital voice data s, and the digital voice. A data latch and converter 80 for latching and converting data s and digital voice data r from an external device, and a memory 100 for storing the latched and converted digital voice data u; An error correcting code unit 90 for encoding data stored in the memory 100, a subcode generated from the microcomputer 10 and various data a, and then a subcode b. And a sub-computing unit 20 which generates a digital data selection signal c by the data latch and conversion unit 80, and generates a synchronization signal by receiving the sub code b and predetermined control. The 8 → 10 modulator 30 which modulates the code 8 → 10 and controls the recording, and the 8 → 10 data serially outputted from the 8 → 10 modulator 30 are non-return-inverted. (Non-Return-to- Zero-Inverted (hereinafter referred to as NRZI) includes an NRZI modulator 40 for modulating and outputting write data, and a write timing generator 60 for generating an operation timing control signal to the respective units.

2 is an exemplary diagram of a tape recording format according to the present invention, FIG. 3A is a configuration diagram of a main ID, and FIG. 3B is an example diagram of bit allocation of ID1-ID7 among the main IDs. 4A is a block diagram of a sub ID, and FIG. 4B is a detailed example of a control ID in the sub ID, and FIG. 4C is a concrete example of a program number ID in the sub ID. FIG. 5 is a diagram illustrating a pack ID and a pack position as a configuration diagram of sub data.

The present invention will be described in detail based on the above configuration.

There are two types of audio data input for recording on the tape, one being digitalized through the analog / digital conversion unit 70 and the other being provided from an external device (r).

The digital voice data s output from the analog / digital converter 70 and the digital voice data latch and converter 80 from an external device are selectively output and stored in the memory 100. At this time, the data latch and converter 80 performs the above-described selection operation under predetermined control. That is, when a sub code and various data (a) are generated from the microcomputer 10, the microcomputer interface unit 20 uses the data latching and converting unit 80 to perform digital voice data from an external device or digital data from the microcomputer 10. A data selection signal c for selecting one of the voice data is generated.

Pure audio data of the input selected by the data selection signal c is first stored in the memory 100. The pure voice data stored in the memory 100 is encoded by a double Reed-Solomon code in the error correction unit 90 and then written to the memory 100. Here, the input / output timing control to the memory 100 and the operation timing control of the error correction unit 90 are managed by the write timing generator 60.

On the other hand, the data stored in the memory 100 is read under the control of the memory write and read timing control signal 1 outputted from the write timing generator 60 and input to the 8 → 10 modulator 30. The 8 → 10 modulator 30 modulates the read data by 8 → 10 modulation and outputs the serial data d. The NRZI modulator 40 inputs the serial data d to perform NRZI modulation, and then, under the control of the output timing control signal k output from the recording timing generator 69, write data to the tape 50. Print out to complete the recording.

At this time, the format recorded on the tape 50 is as shown in FIG. That is, the sub ID and the main ID are recorded on the tape 50 in the order of 8 bits of sync, subcode, subcode parity, and data, respectively. On the other hand, the subcodes come from the microcomputer 10 and two (W1, W2) generated by themselves, as described above, and these subcodes must be applied at the correct timing in accordance with the data format. That is, when the recording timing generation unit 60 designates the position where the synchronization pattern is to be inserted, the 8 → 10 modulator 30 generates a synchronization signal and simultaneously outputs 8 → 10 modulated data d. The NRZI modulator 40 NRZI modulates the data d, writes it on a tape, and sends a subcode W1 after one symbol.

3A shows the configuration of such a main ID. Here, W1 represents a sub code, and this sub code consists of a format ID and ID1-ID7. The format ID and ID1-ID7 are subcodes provided from the microcomputer 10. The frame address 4 bits is generated by itself, dlq is output from the recording timing generating unit 60, NRZI is modulated by the 8 → 10 modulator 30, and recorded on the tape 50.

W2 is a symbol following W1, which is a block address of a main data block. The W2 is generated by the recording timing generating section 60, NRZI modulated via the 8 → 10 modulating section 30 in accordance with the timing, and recorded on the tape 50.

The next symbol is an exclusive OR of W1 and W2 as parity, and is then recorded on the tape 50 after NRZI modulation according to timing.

The next pure main data (audio data and Cl, C2 parity) is sequentially read from the memory 100 and input to the 8 → 10 modulator 30, and then subjected to NRZI modulation after 8 → 10 modulation to the tape 50. In this case, the timing of the fetch from the memory 100 is controlled by the write timing generator 60.

The sub ID shown in FIG. 4 is also recorded in the same form as the above main ID. The control ID, data ID, program number ID2 and program number ID3, which have the same sync pattern and are the SW1 subcodes, are inputted from the microcomputer 10. After 8 → 10 modulation, the NRZI modulation is used to record the tape. The SW2 subcode is input to the pack ID and program number ID1 from the microcomputer 10, and the sub data block address is applied by the self-generated recording timing generator 60. After 8 → 10 modulation, it is recorded on tape through NRZI modulation.

In addition, parity is recorded in the same manner as the main ID, and sub data are sequentially read from the memory 100, and then 8 to 10 modulation is made to be recorded on the tape through NRZI modulation to facilitate utilization of user-controllable sub codes. To help.

According to the present invention as described above, the subcodes in the main ID and the sub ID are recorded by the microcomputer in part and the subcodes generated by the user in part, so that the desired subcode can be accurately recorded on the tape. In addition, there is an advantage that the use of subcodes can be more convenient.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should be determined not only by the embodiments described, but also by the scope of the appended claims and the equivalents of the claims.

Claims (3)

A digital audio tape recorder, comprising: user input means for inputting a sub code, control means for detecting an input of the sub code and generating a data selection signal, means for digitally converting an analog voice signal and outputting digital voice data; Means for selectively latching and converting one of the digitally converted voice data and the digital voice data output from an external device in response to the data selection signal, a memory for storing the latched and converted digital voice data; Error correction means for encoding data stored in the memory, means for generating a synchronization signal under predetermined control, and performing 8 → 10 modulation on the input subcode, and non-zero reverse inversion modulation of the 8 → 10 modulated data. Means for generating data to be recorded on the digital audio tape. Sub-code recording apparatus as. A sub code recording apparatus according to claim 1, wherein said control means is a microcomputer. A sub code recording apparatus according to claim 1, further comprising means for generating a timing control signal necessary for a recording operation.

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