JP2561494B2 - Recording device for measurement - Google Patents

Description

The present invention relates to a measurement recording apparatus suitable for recording measurement data and the like according to a tape recording format of a DTA (Digital Audio Tape Recorder).

[Prior Art] In the rotary head system (R system) DAT, since the tape is obliquely scanned by the head, oblique recording tracks 2 are formed on the tape 1 as shown in FIG. This tape recording format comprises a PCM signal area 3, two sub-code signal areas 4 and 5, and two ATF (Auto Tracking Finding) signal areas 6 and 7. The PCM signal area is an area for recording digital audio data consisting of 16 bits, and the subcode signal area is an area for recording a program number, a time code and the like.

[Problems to be Solved by the Invention] By the way, a general-purpose DAT is used for recording and reproducing measurement data.
By using, it is possible to reduce the cost of the data recorder. Further, since the DAT is capable of stereo recording and reproduction and has a left channel and a right channel, it is conceivable to record the measurement main data in, for example, the PCM area of the left channel and record the sub data such as audio signals in the right channel. To be However, since the amount of sub data is extremely smaller than the amount of main data, the track utilization rate of the sub data channel becomes poor. As a result, the recording capacity of the main data is also limited.
Although the R type DAT has been described above, other digital recording devices also have similar problems.

When the PCM signal area 3 and the subcode signal areas 4 and 5 are arranged on the same track as shown in the track format of FIG. 2, the measurement data is recorded in the PCM signal area 3 and the subcode signal area is recorded. It is conceivable to record voice data and the like in 4 and 5. However, in this case, it is necessary to control the measurement data and the audio data to be arranged in a predetermined area of the track, which makes recording and reproduction troublesome.

Therefore, it is an object of the present invention to provide a recording device for measurement, which enables effective use of a recording medium and can easily record both measured data and audio data related thereto. .

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a measurement data input terminal to which analog measurement data is supplied, and an analog voice signal related to the analog measurement data. A voice signal input terminal, an analog-digital converter for converting the analog measurement data supplied to the measurement data input terminal into digital measurement data, and a digital audio signal supplied to the voice signal input terminal. An analog-digital converter for converting into voice data and a combination of the digital measurement data and the digital voice data to form composite data in word units, wherein a plurality of predetermined bits in each word have the digital data. The measurement data is arranged and the plurality of bits for the digital measurement data in each word are arranged. A composite circuit configured to arrange the digital audio data in the remaining bits having a smaller number of bits than a recording medium, and a recording device connected to the composite circuit for recording the composite data on a recording medium. The present invention relates to a recording device for measurement, which is characterized in that

[Operation and Effect of the Invention] The present invention has the following operation and effect.

(B) Since both measurement data and voice data are placed in each word, it is not necessary to provide a dedicated track for recording voice data related to measurement data independently, and effective use of the recording medium is achieved. To be done.

(B) Since one word is composed of the combination of the measurement data and the audio data related thereto and is recorded, it is possible to easily achieve recording of two types of data.

(C) Since the measurement data and the audio data are included in the same word, it is possible to accurately maintain the time relationship between the two and to provide a recording medium in which synchronized reproduction of both is easy.

[Embodiment] Next, a magnetic tape device according to an embodiment of the present invention will be described with reference to FIGS. The magnetic tape device shown in FIG. 1 is a DAT to which a measurement data recording / reproducing function is added, and has a measurement data processing portion in addition to the DAT portion 10 surrounded by a dotted line.

The DAT portion 10 includes a tape running device 11 for running the cassette type tape 1, a rotating drum 12, and a drum motor 13
And a pair of recording and reproducing heads 14 and a recording and reproducing circuit 16.

The data recorder signal processing unit has a measurement data input terminal 21
A voice data input terminal 22, a clock device 23, a clock data forming circuit 24, two A / D converters 25 and 26, a composite circuit (formatter) 27, a data separation circuit 28, and two
It is composed of D / A converters 29 and 30, a measurement data output terminal 31, an audio data output terminal 32, and a clock data demodulation circuit 33.

[Operation] When recording the measurement data (main data) and the audio data (sub data) related thereto with the tape 1, connect the measurement device to the measurement data input terminal 21 and connect the microphone circuit to the audio signal input terminal 22. Connecting. Although one measurement data channel is shown in FIG. 1, it is of course possible to have multiple measurement data channels. When the measurement data of a plurality of channels is included, the data is separately recorded in the left and right channels of the DAT stereo, or is time-divisionally recorded by another method. The A / D converter 25 connected to the measurement data input terminal 21 converts the analog measurement data 25 into digital measurement data (PCM signal) and sends it to the composite circuit 27.

The A / D converter 26 connected to the audio data input terminal 22
The analog voice data indicating the contents of the measurement data, the start and stop of the measurement data, etc. are converted into digital voice data and sent to the composite circuit 27. In this embodiment, in order to reduce the number of bits of digital audio data, the A / D
The converter 26 is composed of a delta modulation circuit. Since the delta modulation circuit represents the size of the sampled value with 1-bit digital data, in the present application, this also corresponds to 1 of the A / D converter.
Define as a seed.

The clock device 23 sends and displays the date and hour / minute / second signals, and the clock data forming circuit 24 connected to the clock device 23 forms clock data (time code) suitable for recording and composites it. Send to circuit 27.

The composite circuit 27 combines the measurement data, the audio data, and the clock data and sends the composite data shown in FIG. 3 to the recording / reproducing circuit 16. Composite data including measurement data, audio data, and clock data is recorded in the PCM area 3 of the tape recording format shown in FIG. To achieve this record, MSB
To the LSB, the measurement data is placed in the upper 14 bits (MSB to 14SB) of 16 bits, the voice data (1 bit delta modulation output) is placed in the LSB of the left (L) channel, and the right (R)
Place the clock data in the LSB of the channel. Left channel 1
Write 1 for every 1440 data in 5SB, and set 0 for all others. That is, since 1440 data is set as one frame in this magnetic tape device, the data indicating the beginning of the frame is written to the left channel 15SB. The right channel 15SB is a spare.

Since the LSB of the right channel is only assigned to the clock data, write the clock data using multiple words. However, the clock data is arranged so as to be in the same frame.

When the measurement data has a plurality of channels, it may be divided into two groups, one of which may be arranged in the MSB to 14SB of the left channel and the other of which may be arranged in the MSB to 14SB of the right channel. Also,
PCM area 3 when the number of measurement data channels is 3 or more
Is used in time division.

When the compound word shown in FIG. 3 is formed by the compounding circuit 27, 14-bit data is received from the A / D converter 25 and L
Place it on SB-14SB. However, the A / D converter 25 obtains data with a number of bits larger than 14 bits, and the lower bits are truncated to 14 bits, or
It is also possible to receive data of less bits than bits and add zeros to the lower order to make 14 bits.

The composite data shown in FIG. 3 is sent to the recording head 14 via the recording / reproducing circuit 16 of the DAT portion 10 and recorded in the PMC area 3 of the tape 1 in the same manner as the 16-bit data in the DAT. This recording is performed with a data transfer capacity of 96K words / second.

During reproduction, the composite data shown in FIG. 3 is sent to the separation circuit 28. The separation circuit 28 separates the composite data into measurement data, voice data, and clock data, sends the measurement data to the D / A converter 29, sends the voice data to the D / A converter 30, and sends the clock data demodulation circuit 33. Send clock data to. The D / A converter 29 converts the measured data into an analog signal and outputs the measured data to the output terminal 31, and the D / A converter 30 converts the 1-bit serial audio data with a transfer capacity of 48 Kbit / s into an analog signal. Convert and output. The D / A converter 30 includes a demodulation circuit that demodulates the delta modulation signal. The clock data demodulation circuit 33 converts the clock data into a signal suitable for the clock device 23.

 This embodiment has the following advantages.

(1) Measurement data, measurement voice data, and clock data can be recorded on the tape 1 without substantially changing the DAT format. As a result, the measurement data recorder can be configured without significantly changing the DAT, and the cost can be reduced.

(2) Since the audio data is combined with the measurement data as 1-bit serial data by delta modulation, the ratio of the audio data to the measurement data can be suppressed low. Also, voice data can be put in all areas of the measurement data.

[Modifications] The present invention is not limited to the above-described embodiments, but can be modified. For example, spare bits (right channel 15
SB) may also be used for voice data.

[Brief description of drawings]

FIG. 1 is a block diagram showing a magnetic tape device according to an embodiment of the present invention, FIG. 2 is a diagram showing a recording format of the tape of FIG. 1, and FIG. 3 is a composite data formed by the circuit of FIG. FIG. 1 …… tape, 3 …… PCM area, 10 …… DAT part, 11 ……
Tape running device, 14 …… Recording / playback head, 16 …… Recording / playback circuit, 21 …… Measurement data input terminal, 22 …… Voice data input terminal, 25,26 …… A / D converter, 27 …… Composite Circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masato Iijima 3-7-3 Nakamachi, Musashino-shi, Tokyo Inside TEAC Co., Ltd. (56) Reference JP-A-60-247867 (JP, A) JP-A-60 -219678 (JP, A)

Claims (1)

(57) [Claims] 1. A measurement data input terminal to which analog measurement data is supplied, a voice signal input terminal to which an analog voice signal related to the analog measurement data is input, and a measurement data input terminal. An analog for converting the analog measurement data into digital measurement data
A digital converter, an analog-digital converter that converts the audio signal supplied to the audio signal input terminal into digital audio data, and a combination of the digital measurement data and the digital audio data to generate composite data in word units. The digital measurement data is arranged in a plurality of predetermined bits in each word, and the remaining bits having a smaller number of bits than the plurality of bits for the digital measurement data in each word are formed. A measuring circuit, comprising: a decoding circuit configured to arrange the digital audio data; and a recording device connected to the decoding circuit for recording the compound data on a recording medium. Recording device.