close

Вход

Забыли?

вход по аккаунту

?

JPH01293100

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH01293100
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
on-vehicle stereo reproduction apparatus having a so-called surround function that adds
reverberation effects. SUMMARY OF THE INVENTION The present invention is an automotive
stereo reproduction apparatus having a so-called surround function, in which a signal process is
applied to an input signal to cancel an unnecessary reflected sound in a vehicle interior, thereby
audibly approaching an anechoic chamber In this state, a desired stereo sound field is
reproduced by reproducing the stereo input signal and the reverberant signal. C. Prior Art
Conventionally, the so-called surround function in which the space window of the stereo sound
field is enhanced by reproducing the reverberation signal with the rear sub-speaker as well as 1
for reproducing the main performance signal from the front speaker Stereo playback devices
have been put to practical use. For example, in an on-vehicle stereo reproduction apparatus, the
main performance signal is reproduced by the main speaker disposed on the dash board or the
door, and the main performance signal of approximately 20 m5 is produced by the sub-speaker
disposed on the so-called rear tray. By reproducing the delayed reverberation-added signal, the
spatial function of the stereo sound field is improved by the surround function. D. By the way, in
a vehicle-mounted stereo re-sending apparatus in which a small space in a generally enclosed
vehicle compartment is used as a sound field, the sound in the case where an attempt is made to
improve the space window by the above-mentioned surround function. There is a sense of
incongruity because a desired space window can not be completely created due to the reflected
sound that is originally present in the vehicle compartment, which is the space, and a good stereo
presence can not be obtained. The sense of incongruity is based on auditory psychology, and in
order for the original reflected sound in the car room to arrive with the number Ils, a space
window for recognizing the narrowness in the car room is first generated by this reflected sound,
and thereafter about 20a + s Since the sound due to the delayed reverberation signal arrives and
10-05-2019
1
recognition of a wide space occurs, the recognition of the narrowness and the breadth of the
space contradicting each other appears as a sense of discomfort. Therefore, in view of the
conventional situation as described above, the present invention is capable of obtaining a stereo
sound field having excellent sense of reality in a vehicle-mounted stereo reproduction apparatus
in which a small space in a sealed vehicle compartment is a sound field. It is an object of the
present invention to provide an on-vehicle stereo reproducing apparatus having a novel
configuration capable of improving a space window by a surround function without causing a
sense of incongruity. [Means for Solving the Problems] In order to achieve the above-mentioned
object, the vehicle-mounted stereo reproduction apparatus according to the present invention
comprises at least two speakers for stereo reproduction, which are disposed at positions 1i of the
listening position; At least one speaker for reverberation arranged behind the listening position,
and the listening position: I!
Signal processing means for applying signal processing for canceling the reflected sound
reaching 2 to the manual signal of each channel and supplying it to the speaker for stereo
reproduction, forming a reverberation addition signal from the input signal of each channel, and
adding the above reverberation And signal processing means for supplying to the speaker. In the
on-vehicle stereo reproducing apparatus according to the present invention, the sound
reproduced by the speaker for stereo reproduction, to which the input signal is supplied via the
signal processing means, cancels the reflected sound in a small space in the enclosed vehicle
compartment. The listening position is reached in the state. Further, the reproduction sound from
the reverberation adding speaker to which the human power signal is supplied via the signal
processing means reaches the listening position as a residual V sound behind the reproduction
sound from the stereo reproduction speaker. G. Embodiments Hereinafter, one embodiment of
the present invention will be described in detail with reference to the drawings. In the block
diagram of FIG. 1 showing one embodiment of the on-vehicle stereo reproducing apparatus
according to the present invention, (1) is a first signal input terminal to which the right channel
signal Rin is supplied, and (2) is Left channel signal LL,. Is a second signal input terminal to
which is supplied, and each of the above signal input terminals (1) and (2) is a first to fourth
signal processing block (3), (4), (5), (6) ) Are connected to the four speakers (7), (8), (9), (10). Of
the four speakers (7), (8), ('l) and (10), the first and second speakers (7) and (8) are main
speakers for reproducing the main performance signal. For example, listening position! (P) is
disposed on the dash board (11) in front of the driver's seat, and the third and fourth speakers
(9), (10) are sub-speakers for providing the surround effect. For example, the listening position
(P), that is, the so-called Lyatre 4 lay (12) behind the driver's seat is disposed. Here, when sound
is emitted from the first speaker (7), an impulse response (h +) at the listening position ff (P) by
the first speaker (7) is transmitted from the speaker (7). In addition to the direct sound, there is a
once reflected sound, a twice reflected sound,. Therefore, in this embodiment, the inverse
characteristic of the impulse response (h +) in the 5th position fi (P) for the right channel signal
R8 supplied to the first signal input terminal (1). This convolution is performed by performing an
10-05-2019
2
arithmetic processing (* h1 ′ ′) that performs convolution integration with an impulse
response (h, °) such that hl ′ = 1 / hl to be given in the first signal processing block (3). The
integrated right channel signal Rin ′ ′ is supplied to the first speaker (7).
Assuming that the right channel signal Ri ++ supplied to the first signal input terminal (1) is R (<),
the convolution integration processing is performed on the right channel signal Rill in the first
signal processing block (3). When the executed signal Rin 'is reproduced by the first speaker (7),
S + (t) = R (t) * b + (t) * h +' (t) is displayed at the listening position (P). The signal S, (t), which is
indicated by ',' il, * h + '-1) = R (t), arrives. That is, at the listening position (P), the once reflected
sound by the vehicle interior wall surface (13), the twice reflected sound,... N times the reflected
sound are canceled out, and the signal from the first speaker (7) Only the direct sound R (1) will
be heard. The distortion and the like of the reproduction characteristics of the first speaker (7)
itself are also corrected by the convolution integration process (* h, °). In addition, the second
signal processing block (4) cancels the reflected sound by the vehicle interior wall surface (13) in
the same manner as the first signal processing block (3), and the second speaker (8) The impulse
response at the listening position (P) with respect to the left channel signal L 1, n supplied to the
second signal input terminal (2) so that only the direct sound from the speaker can be heard at
the listening position (P) An operation processing (* hz ') for performing convolutional
integration with an impulse response (hz') of hi'-t / hz giving the inverse characteristic of (h2) is
performed. Furthermore, in this embodiment, the third and fourth signal processing blocks (5)
and (6) correspond to the third and fourth speakers (9), (9) for each channel signal Rin'lta '. 10)
cancel the reflected sound by the vehicle interior wall surface (13) of each reproduced sound
according to 10) and add a predetermined delay or reverberation h3 '= (1 / h2) + h3 "h 4"-(1 / h,)
+ h The arithmetic processing (* II: + ') + (* h 4 °) for performing convolutional integration with
each impulse response (t 13 ′), (ha ′) becomes “,”. The above h 3 ′ ′ + h 4 ′ is an
impulse response corresponding to a desired reverberation. Here, each of the first to fourth
signal processing blocks (3), (4), (5), and (6) is configured by a digital signal processing processor
(DSP: Digital Signal processing unit), Based on the coefficients calculated from the respective
impulse responses (h +), (h s, (h s), (h 4) obtained in advance by observation at the listening
position i (I ′) respectively, the above-described convolution is performed Integral processing (*
h +) + (* h g), (* h s) + (* h a) is performed.
In the stereo reproduction apparatus of this embodiment, in the listening position i (r '), the
convolution integration processing C * h +' as described above is performed in the first and
second signal processing blocks (3) and (4). , Each channel signal Ri * '+ L1. . By reproducing the
sound by the first and second speakers (7) and (8), only the direct sound of the reproduced
sound by the two speakers (7) and (Ft) is at the listening position (P). It reaches the state where it
is asking for stereo reproduction sound in the anechoic room as if there is no reflection sound
component by the vehicle interior wall surface (13). Then, in this state, each channel signal Rin
10-05-2019
3
'for which the convolution integration processing (* h 1') and (* h 4 ') as described above is
executed in the third and fourth belief processing block (4). By playing back + L In 'at each of the
third and fourth speakers (9) and (10), in the listening position 11 (P), the reflected sound
component by the vehicle interior wall surface (13) is Without being accompanied, the
reproduction sounds of the reverberation components by the third and fourth speakers (9) and
(10), as well as the direct sound of the main reproduction sound by the first and second speakers
(7) and (8) Can achieve a natural and comfortable space window like listening in a large room or
hall, and obtain a stereo sound field with excellent presence in a small space in the vehicle
compartment. It is possible. The reproduction of the reverberation components by the third and
fourth speakers (9) and (10) is the same even if the reflection sound component by the vehicle
interior wall surface (13) reaches the listening position CP). A surround effect can be provided to
recognize the spread of the sound field at the listening position (P), and the third and fourth
signal processing blocks (5) and (6) may be replaced with mere delay circuits. Further, in the
above embodiment, the reverberation component for giving the narraland effect is also
reproduced in stereo by the two speakers (9) and (10) arranged in the rear tray (12), but the
reverberation component is monaural. Even in this case, a surround effect can be provided, and a
single speaker may be provided at the center of the rear tray (12), and reverberation signals of
respective channels may be added and synthesized to be supplied to the rear speaker. Next, the
embodiment shown in the block diagram of FIG. 2 applies the present invention to an on-vehicle
stereo reproduction apparatus that performs stereo reproduction with the driver's seat and the
passenger's seat as listening positions T1 (P +) and (Pt), respectively. First to third speakers (31)
disposed on the dash board (41).
(32), (33), and fourth and fifth speakers (34), (35) disposed in the rear tray (42), and the first
signal input to which the right channel signal R1, is supplied The terminal (21) is connected to
the first and third speakers (31), (33) via the first signal processing block (23), and the first
signal input terminal (21) Are connected to the fourth speaker (34) through the third signal
processing block (25), and the left group signal 1. A second signal input terminal (22) supplied
with In is connected to the second speaker (32) via a second signal processing block (24), and
the second signal input terminal (22) Is connected to the fifth speaker (35) via a fourth signal
processing block (26). In this embodiment, the listening position (P,) of the driver's seat example
and the listening position (P2) on the passenger side are the first to fifth speakers (41), (42), (43),
(44) , (45) is located on the left and right. The first signal processing block (23) is a listening
position W (P,) of the driver's seat example by the first and third speakers (31), (33) arranged on
both sides of the dash board (41). Impulse response (h +) in). An operation processing (* h + ') for
performing convolutional integration with an impulse response (h + °) such that' = 1 / (h, · h) is
applied to the above right channel signal R in The right channel signal Rin ′ ′ after convolution
integration processing is supplied to the first and third speakers (3+) and (33). Further, the
second signal processing block (24) is the listening position by the second speaker (32) disposed
at the center of the dummy board (41). Operation processing (* hz ') for convolution integration
10-05-2019
4
with an impulse response (h2') of h 2 '= 1 / h2 giving an inverse characteristic of an impulse
response (h2) in (P,) to the above left channel signal L i ++ The left channel signal L + n °
subjected to the convolution integration processing is supplied to the second speaker (32).
Furthermore, "the 2nd 3rd and 4th signal processing blocks (26), (27) are for providing a
surround effect" "-the 4th and 5th speakers (34), each to supply to (35) The third and fourth
signal processing blocks (5), (5), and (4) in the above-mentioned embodiment are provided to
perform signal processing for forming channel reverberation-added signals Rin ° + Lied from
the respective channel signals Ri, and + Li. In the same manner as 6), h4 'cancels the reflected
sound of the reproduced sound by the fourth and fifth speakers (34) and (35) by the vehicle
interior wall surface (43) and adds a predetermined delay or reverberation h4' == (1 / h4) I-h4
"hs' = (1 / h5) + hs" Each impulse response (ha ') and convolutional operation with (hs') rl (* h,' h
') , It is adapted to run against <* h S ') each of the above-mentioned channel signal RIRI L in.
Here, the above h4 ′ ′ and hs ′ ′ are impulse responses corresponding to desired
reverberation. In this embodiment, listening positions (P1) of the driver's seat example positioned
symmetrically with respect to the first to fifth speakers (41), (42), (43), (44), (45). And in the
listening position (Pl) on the passenger side, the above-mentioned convolution integration
processing ("h + as described above according to the first to fourth signal processing blocks (23),
(24), (25), (2G) '). The above first to fifth loudspeakers (41) are implemented by executing (* h
2'L (* h 4 ') I (* h S') for each channel signal R ,,, L, l. , (42), (43), (44). It seems that only the direct
sound is heard because the reflection sound component by the car interior wall surface (13) of
the reproduction sound by (45) is offset and only direct sound is heard, and it is listening in a
large room or ball at each listening position (P,) and (Pl) You can get a sense of space that is
natural and comfortable, and you can get a stereo sound field with a great sense of presence. In
the on-vehicle stereo reproducing apparatus according to the present invention, the reproduction
sound from the speaker for stereo reproduction to which the input signal subjected to the
arithmetic processing by the arithmetic processing means is supplied reaches the listening
position in a state without reflection. As a result, the small space inside the enclosed vehicle
cabin aurally approaches the non-accommodating room, and it is no longer possible to recognize
the narrowness of the space due to the reflected sound in the vehicle interior at the listening
position. At the listening position, the reproduction sound from the speaker for adding the
remaining tee supplied with the input signal subjected to the signal processing by the signal
processing means is a reverberation that is behind the reproduction sound from the speaker for
the stereo 11 live. Since the sound arrives as a sound, the expansion of the space due to the
reverberation can be favorably recognized without recognizing the discomfort (the narrowness of
the space) due to the reflected sound in the vehicle interior at the listening position,-the vehicle
interior It is possible to obtain a stereo sound field with excellent presence in a small space of
[0002]
10-05-2019
5
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing an embodiment of a vehicle-mounted stereo reproduction
apparatus according to the present invention, and FIG. 2 is a block diagram showing another
embodiment of the vehicle-mounted stereo reproduction apparatus according to the present
invention.
1, 2, 21-22-----------------------Signal input terminal 3.4, 5.6, 23, 2, 2, 25 and 26 -----1 Signal
processing block 7.8, 9, 10, 31, 32, 33, 34-35 Speaker II, 41-----1-"1" "-"-------- 42-----------------------------------rear tray 13.43--1 'I room wall
10-05-2019
6
Документ
Категория
Без категории
Просмотров
0
Размер файла
17 Кб
Теги
jph01293100
1/--страниц
Пожаловаться на содержимое документа