JPH02278571A - Audio data recording and playback device - Google Patents

Abstract

PURPOSE:To record and reproduce a sound data of a small bit rate sound data reproducing equipment by means of a large bit rate sound data recording and reproducing device by adding excess bits to a sound processing data to be recorded and eliminating them after reproducing. CONSTITUTION:The sound data of a bit rate A outputted from a sound data processing circuit 3 of the sound data reproducing equipment is supplied to a bit rate conversion circuit 6, and is turned into a data of a bit rate B by an excess bit adding circuit 8 and then recorded via a DAT digital input encoder 9 to the sound data recording and reproducing device 7 of the bit rate B. A regenerative output of this recorded sound data is supplied via a DAT digital output decoder 10 to an excess bit eliminating circuit 11 to be outputted as the sound data of the bit rate A to a sound decoder 4 so as to be reproduced as the sound data.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device that enables an audio data recording and reproducing device with a high bit rate to record and reproduce audio data of an audio data reproducing device with a low bit rate. be.

[Prior Art] As shown in FIG.
e 5ub-Nyquist Sampling En
coding) decoder (2) audio data processing circuit (
3) Output bit rate A (for example, A=1350
Kbps) audio data (PCM signal obtained by digitizing audio signals for 4 channels and compressing the band) into an audio decoder (
4) is converted into an audio signal (analog signal), and a method is being considered in which the audio signal is output from an audio output circuit (5) consisting of an amplifier and a speaker.

On the other hand, DAT (digital audio tape recorder)
Recording and reproduction of audio data (a signal obtained by digitizing the audio signal for Zch) is performed at a bit rate B (for example, B = 1536) [bps] which is higher than the bit rate A.

[Problems to be Solved by the Invention] As mentioned above, the audio data reproducing unit (1) of a high-definition television receiver and the DAT have different bit rates.
A possible problem with AT is that it is not possible to record and reproduce audio data from a high-definition television receiver.

The present invention has been made in view of the above-mentioned problems, and provides an audio data recording and reproducing device that allows an audio data recording and reproducing device with a high bit rate to record and reproduce audio data of an audio data reproducing device with a low bit rate. The purpose is to

[Means for Solving the Problems] The audio data recording and reproducing device according to the present invention provides a bit rate B (B ) The audio data recording and reproducing device of A) is combined, and the bit rate conversion circuit is a surplus bit adding circuit that adds surplus bits to the output data of the audio data processing circuit and outputs it as data at bit rate B. , a digital input encoder inserted between the output side of the surplus bit addition circuit and the input side of the audio data recording/reproducing device; a digital output decoder connected to the output side of the audio data recording/reproducing device; The present invention is characterized by comprising a surplus bit removal circuit which removes surplus bits from the output data of the digital output decoder and outputs the data as bit rate A data to the audio decoder.

[Function] Audio data of bit rate A outputted from the audio data processing circuit of the audio data reproducing device is recorded on the audio data recording and reproducing device of bit rate B (B>A) via the bit rate conversion circuit, and this recorded audio data is outputted from the audio data processing circuit of the audio data reproducing device. The reproduced output of the audio data is output via the bit rate conversion circuit to the audio decoder of the audio data reproducing circuit of bit rate A, and is reproduced as an audio signal. That is, the audio data of bit rate A becomes data of bit rate B by the surplus bit addition circuit, and is recorded on the audio data recording and reproducing device of bit rate B via the digital input encoder, and the playback output of this recorded audio data is as follows. The signal is outputted to the surplus bit removal circuit via the digital output decoder, where the surplus bits are removed, and outputted as audio data of dot rate A to the audio decoder to be reproduced as an audio signal.

[Embodiment] FIG. 1 shows an embodiment of the present invention, and the same parts as in FIG. 2 are given the same reference numerals. In FIG. 1, (1) is an audio data reproducing section of a high-definition television receiver as an audio data reproducing device with a bit rate of A (for example, A=1350 Kbps). The audio data reproducing unit (1) includes M
an audio data processing circuit (3) of the USE decoder (2);
It is equipped with an audio decoder (4) and an audio output circuit (5) consisting of an amplifier and a speaker, and a bit rate conversion circuit (5) is provided between the audio data processing circuit (3) and the audio decoder (4). 6) is coupled to DA T (7) as an audio data recording and reproducing device having a bit rate B (for example, B1536 Kbps) that is higher than the bit rate A. The bit rate conversion circuit (6) includes a surplus bit addition circuit (8) that adds surplus bits to audio data with a bit rate of A (1350 Kbps) and outputs the data as data with a bit rate of B (1536 Kbps); The output side of the bit addition circuit (8) and the DAT
A DAT/digital input encoder (9) inserted between the input side of the DAT (7) and a DAT/digital output decoder (1) connected to the output side of the DAT (7).
0) and this DA'T digital output decoder (engineering 0
), the surplus bit removal circuit (11) removes surplus bits from the output data of the output data and outputs it as audio data of bit rate A to the audio decoder (4).

Next, the operation of the above embodiment will be explained.

During recording, the audio data at bit rate A output from the audio data processing circuit (3) of the MUSE decoder (2) is turned into data at bit rate B by the surplus bit addition circuit (8), and is output to the DAT/digital input encoder ( 9) with bit rate B via D A T (7
) is recorded. During playback, D A T (7
), the playback audio data with a bit rate of B is:
It is outputted to the surplus bit removal circuit (11) via the DAT/digital output decoder (10), where the surplus bits are removed and outputted as audio data of bit rate A to the audio decoder (4), and the audio output circuit ( 5), the audio is reproduced and output.

[Effects of the Invention] As described above, the audio data recording and reproducing device according to the present invention combines an audio data recording and reproducing device with a low bit rate with an audio data recording and reproducing device with a high bit rate using the bit rate conversion circuit. It is possible to record and reproduce audio data from an audio data reproducing device with a low bit rate (eg, an audio data reproducing unit of a high-definition television receiver) using an audio data recording and reproducing device with a high bit rate (eg, DAT).

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an audio data recording/reproducing device according to the present invention, and FIG. 2 is a block diagram showing a conventional example of an audio data reproducing device of bit rate A. (1)...Audio data playback unit (audio data playback device)
, (3)...Audio data processing circuit, (4)...Audio decoder, (6)...Bit rate conversion circuit, (7)
...DAT (audio data recording and playback device), (8)...
・Excess bit addition circuit, (9)...Digital input encoder, (10)...Digital output decoder, (
11)... Surplus bit removal circuit, A, B... Bit rate. 49shi

Claims (2)

[Claims] (1) An audio data recording and reproducing device having a bit rate B (B>A) is coupled between the audio data processing circuit and the audio decoder in the audio data reproducing device having a bit rate A, and the audio data recording and reproducing device having a bit rate B (B>A) is The bit rate conversion circuit includes a surplus bit addition circuit that adds surplus bits to the output data of the audio data processing circuit and outputs the data as bit rate B data, an output side of the surplus bit addition circuit, and the audio data recording/reproducing device. a digital input encoder inserted between the input side of the audio data recording and reproducing device; a digital output decoder connected to the output side of the audio data recording/reproducing device; 1. An audio data recording and reproducing apparatus comprising: an excess bit removal circuit that outputs the data as data to the audio decoder. (2) The audio data according to claim (1), wherein the bit rate A audio data reproducing device is an audio data reproducing unit of a high-definition television receiver, and the bit rate B audio data recording and reproducing device is a digital audio tape recorder. Data recording and reproducing device.