Arrangement for reproduction of a sound recording by headphones

Claim 2

Apparatus for the reproduction of a sound recording over headphones, in which there are fed to the two transducers of the headphones not only, directly, the direct sound pulses taken from the sound signals of the sound recording but also, by means of a reverberation generator and within a period of approximately 50 msec after the input of the direct sound pulse, pulses derived therefrom for the simulation of reverberation reflections which are acoustically strong and which the listener receives apparently from the side, each of which consists of two pulses derived from the direct sound pulse of a sound channel of which the first is fed to one of the headphone transducers and the second is fed, damped as a function of the sound frequency, to the other headphone transducer, wherein in the simulation of at least some of the reverberation reflections, in each case the first pulse is fed to the transducer (right) that is associated with the sound channel (right) from whose direct sound pulse it was derived, characterised in that the individual pulses of the one sound channel, derived from the direct sound pulses and corresponding to first reverberation reflections, are fed to the two transducers of the headphones with a time delay of τ 1 and the pulses of the other sound channel are fed to the two transducers of the headphones with a time delay of τ 2 , τ 1 and τ 2 differing by at least 1.5 msec, as a result of which the pulses in each case appear to the listener to be individually perceived sound reflections from only one reflection face arranged at the side of the listener.

Claim 3

Apparatus for the reproduction of a sound recording over headphones, in which there are fed to the two transducers of the headphones (418) not only, directly, the direct sound pulses (220, 222) taken from the sound signals of the sound recording, but also, by means of a reverberation generator (302; 402) and within a period of approximately 50 msec after the input of the direct sound pulses, pulses derived therefrom for the simulation of reverberation reflections which are acoustically strong and which the listener (2) receives apparently from the side, each of which consists of two pulses (230, 236 and 240, 244) derived from the direct sound pulse of a sound channel, of which the first (230 or 240) is fed to one of the transducers of the headphones (418) and the second (236 or 244) is fed, with a time delay τ 0 of from 0.2 to 1 msec compared with the first pulse, to the other transducer of the headphones (418), wherein in the simulation of at least some of the reverberation reflections, in each case the first pulse (230 or 240) is fed to the transducer (right) that is associated with the sound channel (right) from whose direct sound pulse (222) it was derived, characterised in that the individual pulses (230, 236) of the one sound channel corresponding to first reverberation reflections and derived from the direct sound pulses (220, 222) are fed to the two transducers of the headphones (418) with a delay time of τ 1 and τ 1 + τ o , respectively, and the pulses (240, 244) of the other sound channel are fed to the two transducers of the headphones (418) with a time delay of τ 2 and τ 2 + τ o , respectively, τ 1 differing from τ 2 by at least 1.5 msec, as a result of which the pulses in each case appear to the listener (2) to be individually perceived sound reflections from only one reflection face arranged at the side of the listener.

Claim 4

Apparatus for the reproduction of a sound recording over headphones, in which there are fed to the two transducers of the headphones (418) not only, directly, the direct sound pulses (220, 222) taken from the sound signals of the sound recording, but also, by means of a reverberation generator (302; 402) and within a period of approximately 50 msec after the input of the direct sound pulses, pulses derived therefrom for the simulation of reverberation reflections which are acoustically strong and which the listener (2) receives apparently from the side, each of which consists of two pulses (230, 236 and 240, 244) derived from the direct sound pulse of a sound channel, of which the first (230 or 240) is fed to one of the transducers of the headphones (418) and the second (236 or 244) is fed, with a time delay τ 0 of from 0.2 to 1 msec compared with the first pulse, to the other transducer of the headphones (418), wherein in the simulation of at least some of the reverberation reflections, in each case the first pulse (230 or 240) is fed to the transducer (right) that is associated with the sound channel (right) from whose direct sound pulse (222) it was derived, characterised in that the individual pulses (230, 236) of the one sound channel corresponding to first reverberation reflections and derived from the direct sound pulses (220, 222) are fed to the two transducers of the headphones (418) with a delay time of τ 1 and τ 1 + τ o , respectively, and the pulses (240, 244) of the other sound channel are fed to the two transducers of the headphones (418) with a time delay of τ 2 and τ 2 + τ o , respectively, τ 1 differing from τ 2 by at least 1.5 msec, as a result of which the pulses in each case appear to the listener (2) to be individually perceived sound reflections from only one reflection face arranged at the side of the listener.

Claim 5

Apparatus according to claim 1, characterised in that the individual pulses of the one sound channel corresponding to second reverberation reflections and derived from the direct sound pulses are fed to the two transducers of the headphones with a time delay τ 3 , and the pulses of the other sound channel are fed to the two transducers of the headphones with a time delay of T4 , τ 3 differing from τ 4 by at least 1.5 msec and τ 3 and τ 4 being greater by at least 2 msec than τ 1 and τ 2 , as a result of which the pulses in each case appear to the listener to be individually perceived sound reflections from only one reflection face arranged at the side of the listener.

Claim 6

Apparatus according to claim 2, characterised in that the individual pulses (256, 260) of the one sound channel corresponding to second reverberation reflections and derived from the direct sound pulses (220, 222) are fed to the two transducers of the headphones with a delay time of τ 3 and τ 3 + To respectively, and the pulses (264, 268) of the other sound channel are fed to the two transducers of the headphones with a time delay of τ 4 and τ 4 + τ 0 respectively, τ 3 differing from τ 4 by at least 1.5 msec and T3 and τ 4 being greater by at least 2 msec than τ 1 and τ 2 , as a result of which the pulses in each case appear to the listener to be individually perceived sound reflections from only one reflection face arranged at the side of the listener.

Claim 7

Apparatus according to any one of claims 1 to 4, characterised in that the differences between the time delays τ 1 and τ 2 , and between τ 3 and τ 4 , are at least 2 msec.

Claim 8

Apparatus according to claim 5, characterised in that the differences between the time delays is from 4 to 10 msec.

Claim 9

Apparatus according to any one of claims 1 to 6, characterised in that the reverberation generator (302; 402) simultaneously feeds to the two transducers of the headphones (418) two identical pulses (250, 252), derived from the sum of the direct sound pulses (220, 222) of both sound channels, with a time delay that differs by at least 2 msec. from the time delays τ i , τ 2 , τ 3 and τ 4 of the first pulses (230, 240, 256, 264) of the apparently laterally incoming reverberation reflections in order to simulate a mono-reverberation reflection that appears to come from above or behind.

Claim 10

Apparatus according to claim 7, characterised in that the reverberation generator (402) generates pulses for the simulation of three reverberation reflections, that is of two reverberation reflections that appear to come from different sides and subsequently a mono-reverberation reflection (Fig. 4).

Claim 11

Apparatus according to any one of claims 1 to 8, characterised in that the damping of at least the second pulses of the pulses simulating the reverberation reflections can be varied by means of a manually adjustable damping regulator (428, 442).

Claim 12

Apparatus according to any one of claims 1 to 9, characterised by two input terminals (404, 406) for feeding the sound signals taken from the two sound channels of the sound recording and two output terminals each for connection to a transducer of the headphones (418), wherein, for the direct reproduction of the direct sound pulses each input terminal (404, 406) is connected by way of a first signal path (R o , L o ) to the associated output terminal (408, 410) and, for the simulation in each case of a reverberation reflection, by way of a second signal path (420, 434) to a first time delay device (422, 436) associated with it, which in each case delivers a pulse which on the one hand is fed to the associated output terminal, for example by means of an adding element, and on the other hand is fed by way of a damping filter (428, 442) to the output terminal associated with the other channel, for example by means of an adding element, and, in order to produce, with respect to the direct sound pulse, time delays τ 1 , τ 2 of the two simulated reverberation reflections that differ from one another, the first time delay devices (422, 436) have time delays that differ from one another.

Claim 13

Apparatus according to claim 10, characterised in that there is interconnected in series with the damping filter (428, 442) between the first time delay device (422, 436) and the output terminal (408, 410) a second time delay device (426, 440) with a time delay of τ o .

Claim 14

Apparatus according to one of claims 7 to 10, characterised in that in order to produce a mono-reverberation reflection, both of the input terminals (404, 406) are connected to a common first time delay device (452, 456), of which the output is connected by way of damping filters (H, B, V), a branched line (460) and adding elements (nodal point amplifiers 408, 410) to both output terminals (408, 410), and of which the time delay is at least 2 msec greater than the respective time delay of the two first time delay devices (422, 436), which participate in the production of pulses for the simulation of reverberation reflections that appear to the listener to come from the side.