JPH01184764A - Signal recording system - Google Patents

Abstract

PURPOSE:To record a character information display and to reduce the capacity of a recording medium by making it possible to record sound and character information synchronizing with the sound on the same track. CONSTITUTION:A sound analog signal (a) is converted into a sound digital signal and the digitized sound signal (c) is divided into blocks 100-102 in each optional time unit. Then, a character information area 20 for recording character information following the sound signal is recorded on the recording medium so as to be connected to the sound signal. Then, character data (g) are converted into a prescribed write signal format (h), sound recorded in the recording medium by the preceding processing is monitored, and while retrieving the block concerned, character information synchronizing with the sound is added. Thereby, the character information display synchronizing with sound can be recorded. Consequently, a defect requesting a recording medium of large capacity can be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal recording system, and particularly to a signal recording system for recording character information and audio information on a recording medium such as a magnetic tape.

[Conventional technology]

In conventional signal recording systems, audio information is continuously recorded on a recording medium such as a magnetic tape. In this case, the stereo recording method records left and right audio on separate tracks. In addition, in an image recording system in which audio and images are recorded simultaneously, the audio and images are synchronized and recorded on the recording medium by separating the audio recording track and the image recording track.

[Problem that the invention seeks to solve]

In the conventional signal recording method described above, it is not possible to record text information display synchronized with the audio (for example, subtitle display of the audio or annotation display for the audio) with ordinary audio recording methods other than the image recording method. Although it is possible to synchronize and record audio information and text information on separate tracks, three tracks are required for stereo recording.

In addition, the image recording method has the disadvantage that the recording medium is required to have a relatively large capacity because text information is recorded as an image signal.

[Means for solving problems]

The signal recording method of the present invention includes an audio signal digitizing means that digitizes an audio analog signal to produce an audio digital signal, and a signal recording method that records the audio digital signal on an audio recording track of a recording medium for an arbitrary period of time. an audio signal blocking means for converting the audio signal into blocks into audio digital block signals; and a character information area for recording character information accompanying the audio digital block signal and the audio digital block signal storage area in a contiguous manner on the recording medium. a signal recording means for storing character data in the character information area of the recording medium; a character data blocking means for converting character data into a character data block signal of a specified format to be recorded in the character information area; and character data writing means for recording block signals.

〔Example〕

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

FIG. 1 is a block diagram showing one embodiment, in which a voice input section 40
The input voice input a is converted into an audio signal 61 and input to the audio signal processing section 42. The audio signal processing section 42 digitizes the audio analog signal into signal outputs for each frequency band in fixed sampling time units and sends them as audio digital signals C to the blocking and formatting processing section 43.

The blocking and formatting processing section 43 divides the audio digital signal C into blocks into fixed time units, and sends the write signal d converted into a block writing format to the recording medium to the recording section 44 .

When inputting character data, the character data g sent from the character input section 45 to the character data processing section 47 is sent as code-converted character data h to the blocking and 7-on-one matting processing section 43, where it is format-converted and then sent to the recording section 44. is written in the first character information area searched for.

In the case of reproduction, the reproduction signal i taken out from the reproduction section 49 is sent to the processing section 48 for signal classification, where it is separated into an audio digital signal C and character data hK and sent to the audio processing section 42 and character data processing section 47, respectively. Sent. The audio digital signal is converted into an audio analog signal by the audio signal processing section 42, and then outputted as audio from the audio output section 41. Further, the character data h is displayed and outputted from the code conversion character output section 46 in the character data processing section. FIG. 2 shows an example of the writing format for each block on a track when the audio recording medium is a magnetic tape, and FIG. 3 is a flowchart showing an example of the recording procedure of this system.

An example of a format for writing to a recording medium will be explained based on FIG. 2. Each block is divided into a character information area 20 and an audio signal area 30. The character information area 20 includes an identifier 21. which indicates the starting position of the character information area 20. Block length 22
．． Data 23. It consists of a block end code 24. If the character information is not determined, dummy data is written into the data 23. The audio signal area 30 includes Seibetsu 31. which indicates the starting position of the audio signal area 30. Block length 32° data 33. It consists of a block end code 34. 1
The audio signals recorded in the audio signal area per block are audio signals recorded within a certain period of time, and the character data stored in the character information area per block is limited to within a certain number of characters. One recording data is constructed by repeating this block.

The process flow will be explained based on the following Kia chart 70. First, in step I, an audio analog signal is converted into an audio digital signal. In step 2, the digitized audio signal is divided into blocks of arbitrary time units. This is to record text information for each fixed amount of audio. Next, in step 3, a character information area in which character information accompanying the audio signal is recorded is connected to the audio signal and recorded on the recording medium. This is because a character information area is secured in advance and the character information is written into the corresponding audio block after monitoring the audio. In step 4, the character data is converted into a predetermined write signal format.

Next, in step 5, text information synchronized with the voice is added. At this time, text information is added while monitoring the audio recorded on the recording medium in the above process and searching for the corresponding block.

Note that since the character information area is provided, the audio signal area is recorded in sections, but means such as data buffers and hardware can be easily taken to prevent audio from being separated.

〔Effect of the invention〕

As explained above, the signal recording method of the present invention can record audio and character information synchronized with the audio on the same track.
It is possible to record text information display synchronized with audio (for example, subtitle display for audio or annotation display for audio), and because the text information is recorded as text data rather than an image signal, it has the effect of requiring only a small amount of recording medium. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1...Audio signal digitization processing, 2...
・Audio signal blocking process, 3...Audio signal loading process, 4...Character data blocking process, 5...Character data writing process, 20...
...Character information area, 21...Identifier, 22.
...Block length, 23 ...Data, 24
...End code, 30...Audio signal area, 31...Identifier, 32...Block length, 33...Data, 34... ...End code, 40...Audio input section, 41...
・Audio output section, 42...Audio signal processing section, 43
. . . Blocking and formatting processing section, 44 . . . Recording section, 45 . . . Character input section, 46 . . . Character output section, 47 . ...
Character data processing unit, 48...Signal classification is processing unit, 49...Reproduction unit, 100...Block, 101...Block, 102... ...
Block, a...Audio input, b...Audio analog signal, C...Audio digital signal, d...
・Write signal, e...Audio output, f...
...Character input, g...Character data, h...
...Character data, i...Reproduction signal. Agent: Patent Attorney Shinmu Uchihara

Claims (1)

[Claims] an audio signal digitizing means for digitizing an audio analog signal to produce an audio digital signal; and an audio digital block for dividing the signal into arbitrary time units when recording the audio digital signal on an audio recording track of a recording medium. audio signal blocking means for converting the audio digital block signal into a signal; and signal recording means for storing a character information area for recording character information accompanying the audio digital block signal and the audio digital block signal storage area in a continuous area on the recording medium. a character data blocking means for converting character data into a character data block signal of a specified format to be recorded in the character information area; and character data writing for recording the character data block signal in the character information area of the recording medium. A signal recording method comprising means.