JPS60175260A - Digital audio recorder - Google Patents

Abstract

PURPOSE:To reduce the cost of a data processing circuit and to simplify an overall system structure by having the same contents for bits of a frame of time codes and treating the remaining bits as dummies. CONSTITUTION:The bit constitutions are shown by (a) and (b) for each frame of time codes with fs=44.1kHz and fs=48kHz respectively. That is, SYNC1 consist of 8 bits and CRC2 includes 32 bits (3) showing the time data and 42 bits (4) which can supply other data respectively. When fs=48kHz is satisfied, a 2 bit dummy bit 5 is added in addition to the bit contents. Thus the 8 bits of the SYNC are detected with either one of two types of fs. Hereafter 32 bits of the time data and 42 bits of data are supplied through the CRC. Then the supplied time data and data can be processed when necessary as long as the CRC check is approved.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] According to the present invention, even if several time code frames composed of arbitrary bits coexist, the bit data can be determined using one data processing method. This invention relates to a digital audio recorder that can be used to record audio files.

[Prior art]

Conventionally, the equipment in this building has a time code of 30H2 for digital recording on magnetic tape, and a sampling frequency (hereinafter abbreviated as 8) of 44.1kHz and 48kHz.
When z is more than 2, the full length is set, and the frame length is 1 after 100 bits + JiJ.If the total frame length for valley f3 is calculated, fS is -44, and in the case of 1kHz, it is therefore 1
There are 98 bits per frame, and in the case of fs-48kHz2, there are 100 bits per frame.

Figure 1 shows the bit configuration per frame for each fs K. (a) The figure is for fs = 44.1kHz2,
(Figure b1 is for fS-48kHz2. Synchronization [No. 5 (hereinafter referred to as 5YNQ)] indicating the start of l frame f
i+ is an 8-bit error detection code (hereinafter referred to as ORC) that checks whether manual data has been input correctly.
The fs-4 is configured with the same number of bits as the u 16 bits and the time data f31 and 32 bits, but the data area (4) where other data can be input is
In the case of fs=4.1 KHz, it consists of 42 bits, and in the case of fs=48 KHz, it consists of 44 pits. Therefore, after processing the data i for each bit and fully determining which mode fB is in, the BYNO 8 bits are detected, and the following time data and data (I-ORCk
If the ORC check is OK, the input time data and data processing are processed as necessary. In this case, if fs = 44.1 KHz, the number of bits of input information is 32 bits of time data and 42 bits of data, which is a total of 74 bits, 11. j Neglected, f 8
= 48KH2, the total number of bits of the input blueprint is 7
6 bits are prepared.

Since the time code of conventional Daisicle Audio Record is structured as frame t*@1 or more,
The information of f and 3 must be determined by some method, and since the number of bits of input information is different,
Since it is necessary to prepare the number of bits that match sK, two or more methods of processing the time code are required, which has drawbacks such as circuit complexity and increased cost.)

[Affordability of invention]

This development was developed in order to eliminate the drawbacks of the conventional ones as described above. Even if the fB of the digital audio record is different and the number of bits of one frame of time code is different, the number of bits required for the frame is The overall objective is to provide a digital audio recorder that can determine data by a single data processing method by making the number of bits of input information the same and making the remaining bits lug.

[Example of fraudulent invention]

Hereinafter, an example of a failure of this invention will be explained. FIG. 2 (al# and (b)
The bit structure per frame of the time code for 4.1 KHz and t'5-48KH2VC is shown. 81Y
NO (I+ is 8 bits, ORC(2) is 16 bits,
32 bits (31) indicating time data and 42 bits (consisting of 41) that can input all other data.
In the case of fB-4-8KHz, in addition to the content of bit 1, there are 2 dummy bits (51 is not added. In this way, -r name is EI
All 8 bits of YNO are detected, and the following 32 bits of time data are
If the ORC check is OK, the input time data and data can be processed as necessary.

[Effect of 1 i] As mentioned above, according to Vko, this@chu, time code 1
Since the configuration is such that the contents of the frame bits are the same and the remaining bits are treated as dummy, the data processing time can be reduced to 4Ill+, and the entire system can be reduced to 1~1'.
It has the effect of being able to be used as an element.

[Brief explanation of drawings]

Fig. 1 is a bit structure diagram showing the bit contents of one frame according to an actual example of the conventional bit structure showing gf in the bits of one frame (Fig. 2 is the origin of this). The same symbol 8 indicates the same or equivalent part of t1. Agent Masuo Oiwa Figure 1 Figure 2

Claims (1)

[Claims] In a digital audio recorder that records audio 1M and time code at two or more sampling frequencies, the frame format of the time code is adjusted to match the bit configuration of the frame with the shortest frame length, and the redundant in other frames is A digital audio recorder characterized in that all remaining bits are dummy.