JPH0642295B2 - Recording / playback device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a recording / reproducing apparatus for recording and reproducing a video signal, an audio signal, etc., such as a home VTR, and in particular, a signal input as a digital signal. The present invention relates to a recording / reproducing apparatus that records and reproduces.

[Conventional technology]

For example, a recording / reproducing apparatus such as a home VTR is usually provided with an external signal input terminal. By connecting an external device such as a satellite broadcasting tuner or a PCM encoder / decoder to the external signal input terminal, it is possible to record signals from various signal sources.

By the way, if the signals of various signal sources can be recorded in this way, when reproducing the recorded signal, it is confirmed from which signal source the signal being reproduced is recorded. Becomes difficult.

Therefore, in a conventional recording / reproducing apparatus, after recording of a recording signal is completed, along with this recording signal, a linear audio signal of voice indicating what the signal source is is recorded by post-recording, and at the time of reproducing the recording signal, the linear audio signal is recorded. By reproducing the signal in the linear audio mode, it is possible to confirm from which signal source the recorded signal is recorded.

[Problems to be Solved by the Invention]

However, in the above-mentioned conventional recording / reproducing apparatus, it is necessary to perform post-recording each time a signal is recorded. Moreover, when reproducing the recorded signal, it is necessary to switch to the linear audio mode each time to find the recorded portion of the linear audio signal.

As described above, there is a problem in that each time recording or reproducing a signal, troublesome labor and time are required, and workability is poor.

[Means for Solving the Problems]

In order to solve the above problems, the recording / reproducing apparatus according to the present invention is a recording / reproducing apparatus that includes an external signal input terminal, records a signal input as a digital signal, and reproduces the recorded signal. A category code signal separating means for separating a category code signal from a channel status signal of a digital audio interface inputted together with the signal, and an ID code for outputting an ID code signal based on the category code signal outputted from the category code signal separating means. A signal generating means, a recording means for synthesizing and recording the ID code signal and the recording signal output from the ID code signal generating means, a reproducing means for reproducing the recorded signal, and a separation of the ID code signal from the reproducing signal. Output from the ID code signal separating means and the ID code signal separating means. A category discriminating means for discriminating what the signal source of the reproduced signal is based on the ID code signal, and what is the signal source of the reproduced signal based on the signal output from the category discriminating means. And signal source display means for displaying.

[Action]

With the above configuration, the category code signal separating means separates the category code signal from the channel status signal of the digital audio interface which is input together with the digital recording signal. The ID code signal generating means outputs the ID code signal based on the category code signal output from the category code signal separating means. Then, the recording unit combines the ID code signal output from the ID code signal generating unit and the recording signal, and records them.

As described above, at the time of recording the signal, the ID code signal indicating what the signal source of the signal to be recorded is based on the category code signal of the channel status signal input together with the recording signal without performing post-recording or the like. Recorded automatically.

On the other hand, when reproducing the recorded signal, the ID code signal separating means separates the ID code signal from the signal reproduced by the reproducing means. Then, the category discriminating means discriminates what the signal source of the signal being reproduced is based on the ID code signal outputted from the ID code signal separating means. The signal source display means displays what the signal source of the signal being reproduced is based on the signal output from the category discrimination means.

That is, at the time of reproducing the recorded signal, the signal source display means always and automatically displays what the signal source of the signal being reproduced is. Therefore, it is possible to easily confirm from which signal source the reproduced signal is recorded, without switching to the linear audio mode or searching the recorded portion of the linear audio signal. be able to.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The recording system of the recording / reproducing apparatus is provided with an external signal input terminal 11 as shown in, for example, FIG. 1A, and through this external signal input terminal 11, for example, a sanitary broadcast tuner or P
An external device 1 such as a CM encoder / decoder, a CD, and a DAT is connected. The external device 1 is adapted to output a channel status signal of a digital audio interface including a category code signal as a biphase mark modulated digital signal together with a recording signal such as an audio signal.

The external signal input terminal 11 is connected to the biphase mark demodulation circuit 12. The bi-phase mark demodulation circuit 12 is a circuit that demodulates a bi-phase mark modulated digital signal input from the external device 1 through the external signal input terminal 11 and outputs a demodulation recording signal and a demodulation channel status signal. is there.

The 8th to 15th bits of the demodulation channel status signal constitute a category code signal, and are set to different values for each external device, for example, as shown in Table 1 below, what is the signal source of the signal to be recorded. It is supposed to indicate.

The demodulation channel status signal output from the bi-phase mark demodulation circuit 12 is input to a category code signal separation circuit 13 which is a category code signal separation means for separating the 8th to 15th bits of this demodulation channel status signal as a category code signal. It is supposed to be done.

The category code signal output from the category code signal separation circuit 13 is input to the ID code signal generation circuit 14 which is an ID code signal generation means.
The ID code signal generation circuit 14 outputs the category code signal corresponding to the 8th and 9th bits of the demodulation channel status signal as a 2-bit I
While the D code signal ID1 is used, the category code signal corresponding to the 10th and 11th bits of the demodulation channel status signal is used as a 2-bit ID code signal ID2, and the ID code signals ID1 and ID2 further include a sampling frequency and An ID code signal such as the number of quantization bits is added and output.

The ID code signal output from the ID code signal generation circuit 14 is input to the PCM processor 22 forming the recording circuit 21 together with the demodulation recording signal output from the biphase mark demodulation circuit 12.
The PCM processor 22 uses the memory 23 as a work area, generates an error correction signal of the demodulation recording signal, adds the error correction signal to the demodulation recording signal, and interleaves it.
This is a circuit for adding an ID code signal output from the D code signal generation circuit 14.

The signal output from the PCM processor 22 is QPSK.
It is adapted to be input to the modulation circuit 24. This QP
The SK modulation circuit 24 is, for example, a PC with a carrier frequency of 2.5 MHz.
This is a circuit for QPSK modulating the signal output from the M processor 22.

A recording head 26 is connected to the QPSK modulation circuit 24 via a recording amplifier 25. That is, the signal output from the QPSK modulation circuit 24 is amplified by the recording amplifier 25 and then recorded on the magnetic tape 27 by the recording head 26.

The recording circuit 21 includes the PCM processor 22 and the memory 2.
3, the QPSK modulation circuit 24, and the recording amplifier 25, and as described above, the demodulated recording signal output from the biphase mark demodulation circuit 12 and the ID code signal output from the ID code signal generation circuit 14 are combined. Then, it functions as a recording means for recording.

On the other hand, the reproducing system of the reproducing apparatus is provided with a reproducing circuit 62 for reproducing the signal recorded on the magnetic tape 27, as shown in FIG. In this reproducing circuit 62,
A reproducing preamplifier 63 for amplifying the signal converted into an electric signal by the reproducing head 61 is provided. The reproduction preamplifier 63 is, for example, a BPF that is a bandpass filter that passes only signals in the frequency band of 2.5 MHz ± 650 kHz.
Connected to 64.

The BPF 64 is connected to a QPSK demodulation circuit 65 that restores the original signal by demodulating the QPSK modulated signal. QPS
The K demodulation circuit 65 is connected to the PCM processor 66. The PCM processor 66 is a circuit that uses the memory 67 as a work area and performs processing such as deinterleaving, error correction, and error correction on the signal output from the QPSK demodulation circuit 65.

The reproduction signal output from the PCM processor 66 is DA
It is adapted to be input to the audio output circuit 70 via the converter 68 and the LPF 69. The DA converter 68 is a circuit that converts the reproduction signal output from the PCM processor 66 into an analog signal, and the LPF 69 is
This is a circuit that cuts off the frequency component of, for example, 24 kHz or more in this analog signal. The analog signal reproduced in this manner is output from the audio output circuit 70 to an external amplifier, speaker or the like (not shown).

The reproduction preamplifier 63, the BPF 64, the QPSK demodulation circuit 65, the PCM processor 66, the memory 67, the DA converter 68, the LPF 69, and the audio output circuit 70 are reproduction circuits 62 which are reproduction means for reproducing the signals recorded on the magnetic tape 27. Is configured.

The reproduction signal output from the PCM processor 66 is also input to the ID code signal separation circuit 71 which is an ID code signal separation means. The ID code signal separation circuit 71 is a circuit that separates the ID code signal from the reproduction signal output from the PCM processor 66.

The first and second bits of the ID code ID1 and the first bit of the ID code signal ID2 separated by the ID code signal separating circuit 71 are input to the category judging circuit 72 which is a category judging means. .

As shown in FIG. 2, for example, the category discriminating circuit 72 includes a decoder including two NOT circuits 31 and 32, three AND circuits 33 to 35, and one NOR circuit 36. The first and second bits of the ID code signal ID1 output from the signal separation circuit 71,
And based on the first bit of the ID code signal ID2,
The source of the reproduced signal is discriminated, and five category signals that are alternatively set to the high level are output.

The category signal output from the category discrimination circuit 72 is
Based on this category signal, each is inputted to the drive circuits 42 to 46 of the signal source display device 73 which is a signal source display means for displaying what the signal source of the reproduced signal is. The drive circuits 42 to 46 each include a transistor Tr ₁ and resistors R _{1 to} R ₃ . The output terminals of the drive circuits 42 to 46 are LED
It is connected to the power supply Vcc via 47-51.

In the above configuration, when the signal output from the external device 1 is recorded, the following operation is performed.

From the external device 1, the channel status signal of the digital audio interface including the category code signal is output as a biphase mark modulated digital signal together with the recording signal.

The digital signal output from the external device 1 is transmitted through the external signal input terminal 11 to the biphase mark demodulation circuit 12
Entered in. The digital signal input to the biphase mark demodulation circuit 12 is biphase mark demodulated,
The demodulated recording signal is the PCM processor 22 of the recording circuit 21.
Meanwhile, the demodulation channel status signal is output to the category code signal separation circuit 13.

In the demodulation channel status signal input to the category code signal separation circuit 13, the 8th to 15th bits are separated as a category code signal, and the ID code signal generation circuit 1
4 is output. The ID code signal generation circuit 14 has a 2-bit ID based on the category code signal.
The code signals ID1 and ID2 are generated, and an ID code signal such as a sampling frequency and the number of quantization bits is added and output. The demodulation recording signal output from the biphase mark demodulation circuit 12 is sent to the PCM processor 22. Is entered.

In the PCM processor 22, an error correction signal is added to the demodulation recording signal output from the biphase mark demodulation circuit 12, and interleaving is performed. Then, the ID code signal output from the ID code signal generation circuit 14 is added to the interleaved signal, and the QPSK modulation circuit 24
Is output to.

The signal input to the QPSK modulation circuit 24 is QPSK modulated at a carrier frequency of 2.5 MHz, amplified by the recording amplifier 25, and then recorded on the magnetic tape 27 by the recording head 26.

Further, when the signal recorded on the magnetic tape 27 as described above is reproduced, the following operation is performed.

The signal recorded on the magnetic tape 27 is converted into an electric signal by the reproducing head 61 and amplified by the reproducing preamplifier 63. The amplified signal is 2.5MHz at BPF64.
Only the signal in the frequency band of ± 650 kHz is extracted and Q
QPSK demodulation is performed by the PSK demodulation circuit 65.

The QPSK demodulated signal is subjected to processing such as deinterleaving, error correction, and error correction in the PCM processor 66.

The reproduction signal output from the PCM processor 66 is converted into an analog signal by the DA converter 68, and the LPF
After the frequency component of 24 kHz or higher is removed at 69, it is amplified by the audio output circuit 70. The signal amplified by the audio output circuit 70 is output to an external amplifier, speaker, or the like.

On the other hand, the reproduction signal output from the PCM processor 66 is also input to the ID code signal separation circuit 71, and the ID code signals ID1 and ID2 are separated. Separated ID
The first and second bits of the code signal ID1 and the first bit of the ID code signal ID2 are input to the category discrimination circuit 72.

In the category discriminating circuit 72, if the reproduced signal is, for example, a signal output from a satellite broadcasting tuner, only the first bit of the ID code signal ID2 becomes high level. 35 and the NOR circuit 36 both output a low-level category signal, and only the category signal to which the first bit of the ID code signal ID2 is directly output becomes a high level. Therefore,
The transistor Tr ₁ of the drive circuit 46 in the signal source display device 73 is turned on, the LED 51 is turned on, and it is displayed that the signal being reproduced is a signal output from the satellite broadcasting tuner. .

Similarly, when the reproduced signal is a signal output from a PCM encoder / decoder, a CD, a DAT, or other general device, it is respectively recorded.
Only one of the AND circuit 34, the AND circuit 35, the AND circuit 33, and the NOR circuit 36 outputs a high-level signal, and the LED 48, the LED 49, the LED 47,
And only one of the LEDs 50 is lit.

Thus, when recording the signal output from the external device 1, the ID code signal indicating what the external device 1 is is recorded together with the recording signal. When the recorded signal is reproduced, the signal source display device 73 displays based on the ID code signal so that it is easy to determine which external device recorded the reproduced signal. Can be confirmed.

〔The invention's effect〕

As described above, the recording / reproducing apparatus according to the present invention is provided with an external signal input terminal, and in a recording / reproducing apparatus for recording a signal input as a digital signal and reproducing the recorded signal, the signal is input together with the recording signal. A category code signal separating means for separating a category code signal from a channel status signal of a digital audio interface, and an ID code signal generating means for outputting an ID code signal based on the category code signal output from the category code signal separating means. A recording means for synthesizing and recording the ID code signal and the recording signal output from the ID code signal generating means, a reproducing means for reproducing the recorded signal, and an ID code signal for separating the ID code signal from the reproduced signal Separating means and ID code output from the ID code signal separating means The category discriminating means for discriminating what the signal source of the reproduced signal is based on the signal, and the signal source of the reproduced signal is displayed based on the signal output from the category discriminating means. And a signal source display means.

As a result, it is easy to determine from which signal source the signal being reproduced is recorded, by the display of the signal source display means, without bothering and troublesome time each time the signal is recorded or reproduced. It can be confirmed that the workability is improved.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 (a) is a block diagram showing the configuration of a recording system in a recording / reproducing apparatus, and FIG. 1 (b) is the same reproducing. FIG. 2 is a block diagram showing the configuration of the system, and FIG. 2 is a circuit diagram showing the detailed configuration of the category discrimination circuit and the signal source display device. 11 is an external signal input terminal, 13 is a category code signal separation circuit (category code signal separation means), 14 is an ID code signal generation circuit (ID code signal generation means), 21 is a recording circuit (recording means), and 62 is a reproduction circuit. (Reproduction means),
Reference numeral 71 is an ID code signal separation circuit (ID code signal separation means), 72 is a category discrimination circuit (category discrimination means),
Reference numeral 73 is a signal source display device (signal source display means).

Claims (1)

[Claims] 1. In a recording / reproducing apparatus having an external signal input terminal for recording a signal inputted as a digital signal and reproducing the recorded signal, a channel status signal of a digital audio interface inputted together with the recording signal is changed. Based on the category code signal separating means for separating the category code signal and the category code signal output from the category code signal separating means, I
ID code signal generating means for outputting a D code signal, and I
Recording means for synthesizing and recording the ID code signal and the recording signal output from the D code signal generating means, reproducing means for reproducing the recorded signal, and ID code signal separation for separating the ID code signal from the reproduced signal. And an ID code signal output from the ID code signal separating means,
Category discriminating means for discriminating what the signal source of the reproduced signal is, and signal source display means for displaying what the signal source of the reproduced signal is based on the signal output from the category discriminating means. A recording / reproducing apparatus comprising: