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JPH01291599

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DESCRIPTION JPH01291599
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
installation for reproducing digital audio signals of left and right channels recorded on a
recording medium. [Prior Art] FIG. 4 is a cross-sectional view showing the structure of a
conventional sensory audio signal reproduction apparatus. In FIG. 0, (1) is the main body of the
digital audio signal reproduction apparatus, and (2) is housed in the main body (1). (3) is an
example of a converter that converts an audio digital signal stored in the main unit (1) into a
drive signal for a speaker. A right channel digital to analog converter (hereinafter referred to as
rRch-D / A conversion) (4) is the left channel digital-to-analog converter (hereinafter referred to
as rLch-tl / A converter) housed in the main unit (1), (5) is the main unit (1). Board of circuit
other than housed D / A converter, (6) is the attached connector of circuit board (5), (7) is Rch-D
/ A converter (3), Lch-D / A / D converter Provided between the A converter (4) Shield plate, (8) a
jack connected to the terminal (6), (8) a lead wire which is an example of a transmission line
connected to the jack (8), (10) connected to the lead wire (8) Left speaker, which is an example of
the drive signal / voice converter device l) The right speaker (!) connected to the lead (9) 2) A
headphone comprising the left speaker (10) and the right speaker (11), (13) the head of the user
on which the headphone (12) is mounted, (14) for the clothes of the user It is a pocket provided.
FIG. 5 is a block circuit diagram of this embodiment. (15) is a reproduction amplifier provided on
the circuit board (5), (IB) is a demodulator, and (17) is a decoder. Next, the operation will be
described. In FIG. 5, the digital audio signal reproduced from the recording medium (not shown)
by the digital mechanism (2) is amplified by the reproduction amplifier (15), and the
demodulator (1B) demodulates the synchronous signal to obtain a digital code. It is demodulated
to symbol data before being converted. The symbol data is subjected to error correction
processing by a decoder (17), divided into an Rch-D / A converter (3) and an Lch-D / A converter
(4), left and right channels, and converted into analog voice signals. The audio signal of Rch is
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input to the right speaker (11) through the connector (8), jack (8) and lead wire (9), and the
audio signal of Lch is input to the left speaker [10] and converted to audio respectively Be done.
The user puts the main body (1) in his / her pocket (14) etc., wears the headphone (12) on the
head (13) and listens to the reproduced left and right channel music etc. separately with the left
and right ears Is configured as.
[Problems to be Solved by the Invention] Since the conventional digital audio signal reproduction
apparatus accommodates the Rch-D / A converter and the Lch-D / A converter in the main body,
high density can be achieved in the main body. Cross talk occurs between the mounted Rch-D / A
converter and Lch-D / A converter, and it is difficult to eliminate signal leakage between the left
and right channels even using a shield plate. In addition, the audio signal restored to the analog
signal by the D / A converter has a problem that the S / N deterioration occurs while transmitting
the thin lead wire. The present invention has been made to solve the above-mentioned problems,
and it is an object of the present invention to obtain a digital audio signal reproduction apparatus
capable of reducing crosstalk and S / N deterioration. [Means for Solving the Problems] The
digital audio signal reproduction apparatus according to the present invention separates the Rch
digital / drive signal converter and the Lch digital / drive signal converter to convert left and
right drive signals / voices. It is characterized in that it is arranged in the apparatus. C) The
digital / drive signal converter in the present invention is disposed in the left and right drive
signal / voice converter, and transmitted from the main unit to the drive signal / voice converter
as digital signals. There is no S / N degradation in the transmission line 0, and since the Rch
digital / drive signal converter and the Lch digital / drive signal are separated, crosstalk does not
occur, and the headphone Thus, in the case of the drive signal / voice converter having a
relatively close configuration, the head of the human body interposed therebetween performs the
function of the electrically grounded shield member, so that the left / right digital / drive signal is
There is no cross-talk between the conversion bins. DETAILED DESCRIPTION OF THE
PREFERRED EMBODIMENT An embodiment of the present invention will be described below with
reference to the drawings. FIG. 1 is a cross-sectional view showing the structure of this
embodiment, and FIG. 2 is a block circuit diagram of this embodiment. In FIGS. 1 and 2, the same
reference numerals as in FIGS. 4 and f55 denote the same components, and therefore the
description will be omitted. The difference between this embodiment and the conventional device
is that the Rch-D / A converter (3) is disposed in the head-ho 7 (13) (7) right speaker (11). 4) is
disposed in the left speaker (10). In this embodiment, digital audio signals of left and right
channels demodulated by the decoder (17) are transmitted through the connector (6), the jack
(8) and the lead wire (9) to the Rch-D / A converter (3). And L ah -D / A converter (4),
respectively, so that the sound quality does not deteriorate.
Also, Rch and Lch D / A converters (3). (4)は、それぞれのチャンネルのスピーカ(10)。
(11) Since it is housed approximately 20 cm away because it is housed in the head, and mounted
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on the head (13) at the time of use, the human body acts as a shield, so the D / A converter (3),
The crosstalk generated between (4) is extremely small. FIG. 3 is a view showing the
configuration of another embodiment of the present invention. (18), (19) are speaker devices,
(20), (21) are amplifiers, and D / A is used for the speaker device (18). A converter (3) and an
amplifier (20) for amplifying the output signal to drive a speaker (10) are incorporated, and the
speaker device (13) includes a D / A converter (4), An amplifier (21) for amplifying the output
signal and driving the speaker (11) is incorporated. Next, the operation will be described. In FIG.
2, the digital signal recorded on the medium is reproduced by the digital mechanism (2), and the
reproduced signal is amplified by the reproduction amplifier (15) and then enters the
demodulator (1B) to demodulate the synchronization signal. Connect the jack (8) to the
connector (6), the symbol data is then input to the decoder (17) and is subjected to error
correction processing Then, the digital signal passed through the decoder (17) is transmitted
from the lead (9) to the headphone (12), and the Rch-D / A converter (3) and the Lch-D / A
converter 2 It is converted to a channel analog signal. The converted analog signal enters the
right speaker (11) and the left speaker (10), respectively, and is converted to sound pressure, and
the user puts the body (1) in his pocket (13), etc., moves, or performs other operations When
listening to music etc. recorded on the medium while connecting to an audio reproduction
apparatus (18) having a digital amplifier (19) in the room as shown in FIG. 3, digital signals as
shown in FIG. By connecting the digital output of the playback apparatus to a digital amplifier
(k8) equipped with a high quality D / A converter, a high quality music signal can be obtained
although it is compact. In the above embodiment, the recording medium to be used as the
recording mechanism is not particularly limited, but may be any of a magnetic tape, an optical
disc, or a solid memory. In the above embodiment, the Rch-D / A converter and the Lch-D / A
converter are disposed in the headphones attached to the left and right ears. It may be stored in
a headphone attached to not only the head but also the neck, shoulder, and chest.
In the above embodiment, although the D / A converter is disposed in the headphone and the
speaker is driven by the analog signal, the digital signal is converted into a pulse waveform
according to the frequency to drive the voice coil of the speaker. A digital to digital converter
may be housed. Furthermore, although the above embodiment shows an example of transmitting
through the lead wire and the connector jack through digital electrical signals, the digital optical
signal may be transmitted through the optical cable and the connector jack . As described above,
according to the present invention, since the Rch-digital / drive signal converter and the Lchdigital / drive signal converter are accommodated in the drive signal / voice converter of the
channel, the lead There is an effect that the deterioration of the S / N in the line is bad, and a
digital audio signal reproducing apparatus with less crosstalk between channels is obtained.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is a cross-sectional view showing the structure of an embodiment of the present invention,
and FIG. 2 is a block circuit diagram of this embodiment.
FIG. 3 is a view showing another embodiment of the present invention, FIG. 4 is a cross-sectional
view showing the configuration of a conventional digital audio signal reproducing apparatus, and
FIG. 5 is a block circuit diagram of this conventional example. (1) ... main body of digital audio
signal reproduction device. (1) ... Rah-D / A converter, (4) ...-L ah 7 D / A converter, (10), (11) ...
speaker, (18), (19) ... Speaker device. In the drawings, the same reference numerals indicate the
same or corresponding parts.
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