KR0176638B1 - Method and device for automatic generation of time codes in audio memory recording/reproducing equipment - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

It is a technology that automatically inputs or displays recording time and playback time information in the TOC area by using the start address and end address of the audio data during audio data recording or playback.

2. Technical problem to be solved by the invention

In the memory recorder, when the compression rate of the recorded data is different for each chapter, the recording time and the reproduction time of the chapter are calculated and recorded or displayed on the TOC according to the compression weight.

3. Summary of Solution to Invention

When recording or playing back audio data at different compression rates in the memory, the start and end addresses of the chapters are detected and the recording time and playback time of the chapters are calculated and displayed on the display section according to the compression rate.

4. Important uses of the invention

Applies to memory audio playback and recording devices.

Description

Time code automatic generator and method of memory audio recorder / player

1 is a TOC structure diagram of a memory for storing general audio data.

2 is a block diagram of a memory recorder / player according to the present invention.

Figure 3 is a flow chart of the recording time calculation control when recording data according to the present invention.

4 is a flow chart of a reproduction time calculation control during data reproduction according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a memory recorder / player, and more particularly, to automatically calculate or input recording and playback time information of a TOC according to a compression ratio using a start address and an end address of audio data during voice or music recording or playback. A time code generator and method.

In general, when the voice recorder records voice or music data, the start address of the first chapter (Chapter) immediately starts from the next address of the TOC area in the TOC area having the structure shown in FIG. After recording, the recording end address is detected and recorded in the address area of the first chapter (Chapter) of the TOC area. The recorded time of each chapter can be calculated from this start address and the end address. For example, if the start address is 00000020h and the end address is 01000000h in the case of 16-bit data for general 44.1KHz sampling, the following calculation is made.

[8-bit memory]

01000000h = 1 * 16 ⁶ = 16777216, 0020h = 2 * 16 = 32,

16777216-32 = 16777184 bytes,

16777184/44100 samples / 2 bytes = 190 sec.

In this way, the recording time of the recorded voice or music can be calculated. If the data with 4: 1 extrusion ratio is recorded, the actual playback time (recording time) is 190 seconds * 4.

However, it is not a problem because the recording time can be calculated when the data of each chapter recorded in the memory has a certain format as described above, but it is not a problem, but when the data having different compression ratios are recorded for each chapter in the memory, it is actually recorded. The time was different for each chapter, there was a problem that can not calculate the recording time of the music or voice.

Accordingly, an object of the present invention is to detect the start address and end address of the recorded data automatically when the compression rate of the recorded data is different for each chapter in the memory recorder to solve the above problems. Disclosed is a time code generator and method for calculating or recording a recording time and a playing time in a TOC.

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

2 is a block diagram of a memory recorder / player according to the present invention. The key input unit 10 includes numeric keys and recording keys, which are various function keys, and playback keys to generate commands according to these key inputs. The control unit 12 receives the recording and playback commands generated from the key input unit 10, generates an encoding and decoding enable signal, detects the start address and the end address of the recording data, and calculates the recording time of the chapter according to the compression ratio. It generates a control signal to control, and controls to store the calculated recording time and playback time. An analog / digital (A / D) converter 14 converts an analog audio signal into a digital audio signal. The digital / analog (D / A) converter 16 converts the digital audio signal into an analog audio signal. The codec 18 encodes an audio signal digitally converted from the A / D converter 14 by the enable signal generated from the control unit 12, MPEG layer information, compression ratio, and sampling frequency information, and outputs an audio reproduction signal. Decoded and outputted to the D / A converter 16. The data buffer 20 stores digital audio signals encoded from the codec 18 under the control of the control unit 12 or stores the reproduced digital audio signals output from the control unit 20. The time code calculator 24 receives the start address, the end address, the compression ratio, and the sampling frequency information of the data under the control of the control unit 12 to calculate the recording time and the reproduction time. The address register 26 temporarily stores the recording and reproducing addresses under the control of the control unit 12. The memory 28 stores the TOC and chapter-specific audio information under the control of the controller 2. The TOC buffer 22 temporarily stores the TOC information read from the memory 28 under the control of the controller 12. The display unit 30 displays the recording time and the reproduction time under the control of the control means.

3 is a flow chart for controlling the recording time calculation during data recording according to the present invention. When the power is supplied, the TOC information of the memory is read to detect the end address of the last chapter currently recorded, and the start address of the next chapter to be recorded. A process of setting, setting a desired compression rate after setting the start address of the chapter to be recorded, and generating an encoding start signal when a recording start key is input after setting the compression rate to encode and encode an audio signal. Storing audio data, stopping encoding when the recording stop key is input, loading the end address of the chapter, and loading the chapter end address, and setting the chapter The recording time is calculated by reading the start address, end address and compression rate of the It is made of tablets.

4 is a flowchart of a control of calculating a playback time when reproducing data according to the present invention. The process of retrieving the number of songs of a chapter currently recorded by reading TOC information of a memory when power is supplied and retrieving the number of songs of the chapter After the start key and the end address of the chapter are read, a process of recognizing the reproduction data compression rate of the read chapter and the recognition of the reproduction data compression ratio are performed. The process is done.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4.

First, the operation of calculating the recording time according to the compression ratio set by the user at the time of recording will be described with reference to FIGS. 2 and 3. Is loaded into the TOC buffer 22, and the end address of the chapter recorded in the memory 28 is set in the address register 26 by setting the start address of the next chapter to be recorded. If no data is recorded in the memory 28, the address after the TOC area becomes the start address of the chapter to be recorded. When the user inputs a desired compression ratio through the key input unit 10, in step 32, the controller 12 stores and stores the input compression ratio in the memory 28. Then, in step 33, the control unit 12 checks whether the recording start key is input from the key input unit 10, and receives the audio signal when the recording start key is input. At this time, an audio signal, which is a voice or music signal, is input in a digital signal or analog form, and the analog audio signal is converted into a digital audio signal by the A / D converter 14 and applied to the codec 18. In operation 34, the control unit 12 generates an enable signal, a compression rate, and sampling frequency information, which are encoding start signals, and applies the generated code to the codec 18. The codec 18 then encodes the input digital audio signal and outputs it to the data buffer 20. At this time, the data buffer 20 stores the audio data encoded by the codec 18 under the control of the controller 12. In the encoding scheme such as MPEG, since various compression ratio schemes are provided from 4: 1 to 12: 1, the control unit 12 should provide information about this to the codec 18. The bitrate of compressed data according to the compression rate provided by MPEG is as follows.

4: 1 compression-384 Kbps (bit / sec) steroe

6: 1 compression-256 Kbps

8: 1 compression-192 Kbps

12: 1 compression-128 Kbps

The encoded data stored in the data buffer 20 is stored in the chapter of the memory 28 sequentially from the start address set in the address register 26. Then, in step 35, the control unit 12 checks whether the recording stop key is input from the key input unit 10. If the recording stop key is not input, the control unit 12 continues to step 34. . In step 36, the control unit 12 generates a disable signal, which is an encoding stop signal, and applies it to the codec 18. Then, the controller 12 reads the value of the address register 26 at that time and loads it as the end address value of the chapter. Proceed. In step 37, the control unit 12 reads the start address of the chapter, the end address of the recording end, and the set compression ratio from the memory 28 and outputs them to the time code calculator 24. Then, the time code calculator 24 calculates the recording time by the following equation (1).

Recording time (seconds) = (start address-end address) * 8 bits / bit rate

In operation 38, the controller 12 stores the updated recording time in the TOC buffer 22 and updates the recording time. The controller 12 stores the updated recording time in the TOC buffer 22 in the memory 28 and displays the display unit 30. Mark on.

In addition, referring to FIG. 2 and FIG. 4, the operation of calculating the time recorded according to the compression ratio of each chapter when the compression ratio of the recorded data is different for each chapter will be described. ) Reads the TOC information of the memory 28 and loads it into the TOC buffer 22 to retrieve information on how many chapters are. In step 42, the controller 12 checks whether a playback key is input from the key input unit 10, and proceeds to step 43 when the playback key is input. In step 43, the controller 12 reads the start address and the end address of the chapter recorded in the memory 28, loads the start address into the address register 26, and recognizes the compression ratio of the chapter. Here, the compression rate can be recognized in two ways. First, when the compression rate is recorded in the TOC area of the chapter during recording, the playback time is calculated by reading the compression rate information of the TOC area when playing. Secondly, in the case of MPEG encoding, the compression rate information of the encoded data is included in the header of the data. The MPEG header is included in the first 32 bits of the data, and during reproduction, the control unit 12 reads the header to recognize the compression rate information. At this time, the control unit 12 generates an enable signal, which is a decoding start signal, and applies the enable signal to the codec 18. The codec 18 decodes the playback data to start playback of the audio data stored in the memory 28. Then, in step 44, the control unit 12 calculates the playing time of the chapter according to the recognized compression ratio and displays it on the display unit 30.

As described above, according to the present invention, when recording or playing audio data in a memory at a different compression rate, the present invention calculates and displays the recording time and the playing time of chapters corresponding to the compression rate, so that the compression rate is different for each chapter. Even if the recording time or playback time can be calculated and displayed, there is an advantage that the system can be used conveniently.

Claims (6)

A memory audio recording apparatus comprising: a key input means for generating a command according to the key input having a recording start key and a compression rate setting key, and receiving a recording start command generated from the key input means to generate an encoding enable signal; Control means for detecting the start address and the end address of the recording data so as to calculate the recording time of the chapter according to the compression rate, and the enable signal and MPEG layer information, the compression rate, and the sampling frequency information generated from the control means. Encoding means for encoding and outputting the digital audio signal, data buffer means for storing the digital audio signal encoded from the encoding means under control of the control means, and start and end addresses of the data under the control of the control means. And recording time by receiving compression rate and sampling frequency information. A time code calculating means for calculating, an address register for temporarily storing a recording address under control of the control means, a memory means for storing TOC and chapter-specific audio information under control of the control means, And a TOC buffer for temporarily storing the TOC information read from the memory means under control, and a display means for displaying the recording time under the control of the control means. 2. The apparatus of claim 1, further comprising analog / digital converting means for converting the audio signal into a digital audio signal and outputting the converted audio signal to the encoding means. A memory audio reproducing apparatus, comprising: a key input means for generating a command according to the key input, having a playback recording start key; and receiving a recording start command generated from said key input means to generate a decryption enable signal, Control means for detecting a start address and an end address to calculate a play time of a chapter according to a compression ratio, memory means for storing TOC and chapter-specific audio information under control of the control means, and A TOC buffer for temporarily storing TOC information read from the memory means under control, a data buffer means for storing a digital reproduction audio signal read from the memory means under control of the control means, and generated from the control means. Based on the enabled signal, MPEG layer information, compression rate, and sampling frequency information. Decoding means for decoding and outputting the digital audio reproduction signal outputted from the data buffer means; Automatic generation of a time code of a memory player, comprising: a calculation means, an address register for temporarily storing a reproduction address under the control of the control means, and a display means for displaying the reproduction time under the control of the control means Device. 4. The apparatus of claim 3, further comprising digital / analog converting means for converting and outputting the digital audio signal decoded from the decoding means into an analog audio signal. In the audio recording method of the memory, when power is supplied, reading the TOC information of the memory, detecting the end address of the last chapter currently recorded, and setting the start address of the next chapter to be recorded, and Setting a desired compression rate after setting a start address; generating an encoding start signal when a recording start key is input after setting the compression rate; encoding an audio signal to store encoded audio data; and Storing the recorded audio data, stopping encoding when the recording stop key is input, loading the end address of the chapter, recording the start address, the end address, and the compression rate of the set chapter after loading the end address of the chapter. Time code ruler, characterized in that the time is calculated and stored in the memory Method of occurrence. In the memory audio reproducing method, a process of retrieving the number of songs of the currently recorded chapter by reading TOC information of the memory when power is supplied, and retrieving the number of songs of the chapter, A time code comprising the steps of recognizing the reproduction data compression ratio of the read chapter after reading the start address and the end address, and calculating and displaying the reproduction time according to the compression ratio after recognizing the reproduction data compression ratio Automatic generation method.